Cellulose-Based Flexible Functional Materials for Emerging Intelligent Electronics
作者:
Zhao, Dawei;Zhu, Ying;Cheng, Wanke;Chen, Wenshuai;Wu, Yiqiang* ;...
期刊:
Advanced Materials ,2021年33(28):e2000619 ISSN:0935-9648
通讯作者:
Yu, Haipeng;Wu, Yiqiang
作者机构:
[Zhu, Ying; Yu, Haipeng; Cheng, Wanke; Zhao, Dawei; Chen, Wenshuai] Northeast Forestry Univ, Minist Educ, Key Lab Biobased Mat Sci & Technol, Harbin 150040, Peoples R China.;[Zhao, Dawei] Shenyang Univ Chem Technol, Inst Ind Chem & Energy Technol, Shenyang 110142, Peoples R China.;[Wu, Yiqiang] Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Peoples R China.
通讯机构:
[Yu, Haipeng] N;[Wu, Yiqiang] C;Northeast Forestry Univ, Minist Educ, Key Lab Biobased Mat Sci & Technol, Harbin 150040, Peoples R China.;Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Peoples R China.
关键词:
cellulose;energy storage systems;flexible electronics;nanomaterials;sensors
摘要:
There is currently enormous and growing demand for flexible electronics for personalized mobile equipment, human–machine interface units, wearable medical-healthcare systems, and bionic intelligent robots. Cellulose is a well-known natural biopolymer that has multiple advantages including low cost, renewability, easy processability, and biodegradability, as well as appealing mechanical performance, dielectricity, piezoelectricity, and convertibility. Because of its multiple merits, cellulose is frequently used as a substrate, binder, dielectric layer, gel electrolyte, and derived carbon material for flexible electronic devices. Leveraging the advantages of cellulose to design advanced functional materials will have a significant impact on portable intelligent electronics. Herein, the unique molecular structure and nanostructures (nanocrystals, nanofibers, nanosheets, etc.) of cellulose are briefly introduced, the structure–property–application relationships of cellulosic materials summarized, and the processing technologies for fabricating cellulose-based flexible electronics considered. The focus then turns to the recent advances of cellulose-based functional materials toward emerging intelligent electronic devices including flexible sensors, optoelectronic devices, field-effect transistors, nanogenerators, electrochemical energy storage devices, biomimetic electronic skins, and biological detection devices. Finally, an outlook of the potential challenges and future prospects for developing cellulose-based wearable devices and bioelectronic systems is presented. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
语种:
英文
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Robust versatile nanocellulose/polyvinyl alcohol/carbon dot hydrogels for biomechanical sensing
作者:
Wang, Zhiqi;Cheng, Fangchao;Cai, Hangchuan;Li, Xiurong;Sun, Jianping;...
期刊:
Carbohydrate Polymers ,2021年259:117753 ISSN:0144-8617
通讯作者:
Cheng, Fangchao(fangchaocheng@gxu.edu.cn)
作者机构:
[Wang, Zhiqi; Sun, Jianping; Cheng, Fangchao; Cai, Hangchuan; Li, Xiurong] Guangxi Univ, Sch Resources Environm & Mat, Guangxi Key Lab Proc Nonferrous Metall & Featured, Nanning 530004, Peoples R China.;[Wu, Yiqiang; Cheng, Fangchao] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Wang, Nannan] Guangxi Univ, Sch Resources Environm & Mat, GIFT Guangxi Inst Fullerene Technol, Nanning 530004, Guangxi, Peoples R China.;[Zhu, Yanqiu] Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4SB, Devon, England.
通讯机构:
[Fangchao Cheng] G;Guangxi Key Laboratory of Processing for Nonferrous Metallic and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China<&wdkj&>College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
关键词:
Biological–mechanical sensing;Biomass-based hydrogel;In-situ hydrothermal synthesis;Multifunctionality;Self-healing
摘要:
A new type of nanocellulose/poly(vinyl alcohol)/carbon dot (NPC) multifunctional hydrogel was successfully fabricated by an one-step in-situ hydrothermal method. The one-pot strategy led to the formation of a complex hydrogen bonding/dynamic boric acid ester/nitrogen-doped carbon dots network, and endowed the hydrogel with multifunctionality. The hydrogel underwent self-healing at room temperature (25 °C) and exhibited double-emission fluorescence and high mechanical strength (tensile strength of up to 2.98 MPa). An NPC hydrogel-based capacitive sensor exhibited remarkable linear capacitance responsiveness toward pressure, strain, and glucose concentration, and enabled real-time synchronous quantitative pressure/glucose sensing with multiple linear correlations, which was a key performance criteria for biomechanical sensors. The versatility and multiple advantages of the as-prepared hydrogel demonstrate the potential of biological–mechanical sensing materials using natural cellulosic biomass. © 2021 Elsevier Ltd
语种:
英文
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不同干燥方法对杉木吸湿及尺寸稳定性的影响
作者:
高鑫;周凡;付宗营;江京辉;吴义强;...
期刊:
安徽农业大学学报 ,2020年47(5):730-737 ISSN:1672-352X
作者机构:
中国林业科学研究院木材工业研究所,北京100091;中南林业科技大学材料科学与工程学院,长沙410004;[周永东; 周凡; 付宗营; 江京辉; 高鑫] 中国林业科学研究院木材工业研究所;[吴义强] 中南林业科技大学
关键词:
木材干燥;吸湿性;尺寸稳定性;杉木;干燥方法
摘要:
为明确不同干燥方法对人工林杉木吸湿及尺寸稳定性的影响,以40 mm杉木锯材为研究对象,通过高温干燥、常规干燥和气干3种方法进行干燥处理,采用双室温、湿度控制法和GAB等温吸附模型拟合系统研究了干燥方法对平衡含水率、尺寸稳定性、等温吸附线型等的影响规律,并采用低温核磁共振分析测定不同干燥方法试样的细胞壁最大吸着水含量。结果表明:相较于气干及常规干燥,高温干燥可较为显著的降低试样吸湿平衡含水率及弦向线性湿胀率;不同干燥方法试样的等温吸附曲线均可由GAB模型拟合,拟合度均高于0.91,且呈现第二类等温吸附曲线特征;高温干燥试样细胞壁吸着水最大含量明显低于气干和常规干燥材,与高温干燥对平衡含水率影响规律相似。
语种:
中文
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Synthesis and characterization of lactic acid esterified starch by an in-situ solid phase method
作者:
Li, Ping;He, Xiaoyu;Zuo, Yingfeng* ;Li, Xianjun;Wu, Yiqiang*
期刊:
International Journal of Biological Macromolecules ,2020年156:1316-1322 ISSN:0141-8130
通讯作者:
Zuo, Yingfeng;Wu, Yiqiang
作者机构:
[Wu, Yiqiang; Zuo, YF; Li, Ping; Zuo, Yingfeng; Li, Xianjun; He, Xiaoyu] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Zuo, YF; Wu, YQ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词:
Corn starch;Esterification modification;Hydrophobicity;In-situ solid phase method;Lactic acid;Thermoplasticity
摘要:
To improve the hydrophobicity and thermoplastic processability of starch, lactic acid esterified starch (LA-e-starch) was prepared by in-situ solid phase esterification with corn starch as the raw material and LA as the esterifying agent. Fourier transform infrared spectroscopy confirmed that the esterification reaction was successful. The optimal esterification efficiency of LA-e-starch was obtained when the LA proportion was 20% by mass, catalyst ratio at 3%, reaction temperature 80 degrees C and reaction time 2.5 h. LA-e-starch was characterized by scanning electron microscopy (SEM), contact angle (CA) analysis, X-ray diffractometry (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) as well as its water absorption rate evaluated. Results showed that in-situ solid phase esterification mainly occurred on starch granule surfaces and did not destroy the starch granularity. LA-e-starch surfaces were covered with a layer of polylactic acid resin, which caused starch granules to stick together. The initial contact angle of LA-e-starch was clearly larger than that of native starch and the water absorption rate lower than native starch in a 168 h test time, which showed that esterification effectively improved the hydrophobicity of starch. This esterification destroyed the crystalline structure of starch to some extent, resulting in a crystallinity reduction to 25.16%. In addition, the gelatinization temperature and enthalpy were lower than those of native starch. XRD and DSC analyses indicated that esterification modification increased starch thermoplasticity. Also, LA-e-starch exhibited better thermal stability than native starch, from which it was inferred that this application of esterification could improve the thermoplastic processability of starch modify the interfacial compatibility between starch and polymer resins.
语种:
英文
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油茶果壳高值化利用研究进展
作者:
刘竹;杨守禄;姬宁;罗扬;许杰;...
期刊:
材料导报 ,2020年34(S01):120-127 ISSN:1005-023X
作者机构:
贵州省林业科学研究院,贵阳,550005;贵州省林业科学研究院,贵阳 550005;中南林业科技大学材料科学与工程学院,长沙 410004;中南林业科技大学材料科学与工程学院,长沙,410004
关键词:
油茶果壳;活性炭;茶皂素;油茶果壳基复合材料
摘要:
油茶(Camellia oleifera abel)是我国特有的木本食用油料树种,属山茶科山茶属,在南方有大面积的种植.油茶果壳是油茶果实加工后产生的副产物,随着油茶产业的兴起,每年都会产生大量的油茶果壳.过去油茶果壳的处理方式通常为填埋或直接燃烧,这不仅造成了资源的浪费,还产生了环境污染等问题.对其进行充分利用有助于解决油茶果壳的处理问题,也是提升油茶附加值的重要途径,同时为废弃生物质材料的再生利用开辟了新方向,具有广阔的市场空间和应用前景.活性炭的制备是油茶果壳最普遍的研究,由于油茶果壳复杂的成分和特殊的结构,不同工艺所制备的活性炭性能差异大,且最佳制备工艺还尚无定论.近年来,研究人员不断在活化工艺方面进行优化,并且制备出不同功能的生物质炭衍生材料.此外,根据油茶果壳的多种成分,以油茶果壳为基体的复合材料、茶皂素的提取及其中不同成分的利用已成为当前研究的焦点.油茶果壳成分中所含有的纤维素、半纤维素及木质素作为木质复合材料基体与其他材料的相容性还有待进一步研究;茶皂素、水溶性多糖及类黄酮等物质使得油茶果壳成为众多应用的理想原料,如吸附、脱色、抗癌、抗氧化等.本文从油茶果壳的各种成分及结构特征切入,介绍了油茶果壳在油茶果壳基复合材料、活性炭及茶皂素的提取及应用方面的最新研究,同时结合当今研究的热点如纳米纤维素材料、电极材料等,介绍了油茶果壳在其中积极的作用,以期为油茶果壳的高值化利用提供依据.
语种:
中文
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Modeling moisture and heat transfer during superheated steam wood drying considering potential evaporation interface migration
作者:
Hao, Xiaofeng;Yu, Changming;Zhang, Guoqiang;Li, Xianjun;Wu, Yiqiang;...
期刊:
Drying Technology ,2020年38(15):2055-2066 ISSN:0737-3937
通讯作者:
Lv, Jianxiong
作者机构:
[Wu, Yiqiang; Zhang, Guoqiang; Hao, Xiaofeng; Lv, Jianxiong; Li, Xianjun] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Yu, Changming] Univ Sci & Technol Beijing, Sch Mech Engn, Beijing, Peoples R China.
通讯机构:
[Lv, Jianxiong] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词:
Camphorwood;teak;superheated steam drying;interface evaporation rate;volume evaporation rate;moisture and heat transfer model
摘要:
In the present study, a mathematical model with a moving evaporation interface was constructed to quantitatively assess the mechanisms of moisture and heat transfer during superheated steam wood drying. In this model, the unsaturated Darcy flow of free water was considered as Fick diffusion. By modeling the interface evaporation rate and volume evaporation rate, the model (1) characterized the moving water evaporation interface; (2) quantified the dynamic alterations of wet/dry regions; and (3) predicted the change regularity of real-time temperature, moisture content, interface evaporation rate, volume evaporation rate, vapor density, and relative humidity at specific locations during the wood drying. Compared with the superheated steam drying experiments using camphorwood (Cinnamomum camphora (L.) Presl) and teak (Tectona grandis L.f) specimens in different sizes, it was suggested that the developed model was able to accurately predict their drying processes, and the parameters calculated from the model contributed to the optimization of a superheated steam drying technique for teak. © 2019 Taylor & Francis Group, LLC.
语种:
英文
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Application of Micro-Ftir Spectroscopy to Study Molecular Structure of Desorbed Water in Heat-Treated Wood During Moisture Desorption Process
作者:
Yuan, Hanmeng;Guo, Xin* ;Wu, Yiqiang;Ma, Qiang;Xiao, Teng
期刊:
Journal of Wood Chemistry and Technology ,2020年40(1):33-43 ISSN:0277-3813
通讯作者:
Guo, Xin
作者机构:
[Yuan, Hanmeng; Guo, Xin; Ma, Qiang] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China;[Wu, Yiqiang; Xiao, Teng] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China
通讯机构:
[Guo, Xin] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.
关键词:
Molecular association;moisture desorption process;desorbed water;micro-FTIR spectroscopy
摘要:
For getting a better understanding of molecular association between water and wood, molecular structure of desorbed water in a typical wood (i.e. heat-treated wood) during moisture desorption process was investigated using micro-FTIR spectroscopy. Spectra were collected in the relative humidity (RH) region from high level to low level. A qualitative analysis of these spectra and corresponding difference spectra confirmed moisture sorption sites and determined main spectral region affected by moisture sorption. In addition, from component peak analysis of the identified spectral region of difference spectra, three component peaks were attributed to three types of bound water. Based on change of bound water against RH, the entire moisture desorption process of heat-treated wood could be separated to three parts. Moreover, molecular structure of desorbed water in these three parts was demonstrated, separately.
语种:
英文
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Preparation and Characterization of Hydrophobically Grafted Starches by In Situ Solid Phase Polymerization
作者:
Zuo, Yingfeng;He, Xiaoyu;Li, Ping;Li, Wenhao;Wu, Yiqiang*
期刊:
Polymers ,2019年11(1) ISSN:2073-4360
通讯作者:
Wu, Yiqiang
作者机构:
[Wu, Yiqiang; Li, Wenhao; Zuo, Yingfeng; Li, Ping; He, Xiaoyu] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词:
corn starch;hydrophobic modification;in situ solid phase polymerization;lactic acid;maleic anhydride;methyl acrylate
摘要:
Three kinds of hydrophobic groups grafted starches of maleic anhydride grafted starch (MAH-g-starch), lactic acid grafted starch (LA-g-starch), and methyl acrylate grafted starch (MA-g-starch) were prepared by in situ solid phase polymerization. The results of Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) confirmed successful grafting. The grafting ratios of MAH-g-starch, LA-g-starch, and MA-g-starch were 6.50%, 12.45%, and 0.57%, respectively. Influenced by the grafting ratio, LA-g-starch had the best relative hydrophobicity and the largest molecular weight, and those for MA-g-starch were the worst. The surfaces of grafted starches were covered with graft polymer, with obvious surface roughness and bond degree of MAH-g-starch and LA-g-starch. The crystalline structure of grafted starches showed some damage, with LA-g-starch exhibiting the greatest decrease in crystallinity, and less of a change for MA-g-starch. Overall, the grafting reaction improved thermoplasticity, with LA-g-starch the most improved, followed by MAH-g-starch, and then MA-g-starch.
语种:
英文
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Study on the compatible interface of bamboo fiber/polylactic acid composites by in-situ solid phase grafting.
作者:
Li, Wenhao;He, Xiaoyu;Zuo, Yingfeng* ;Wang, Shu;Wu, Yiqiang*
期刊:
International Journal of Biological Macromolecules ,2019年141:325-332 ISSN:0141-8130
通讯作者:
Zuo, Yingfeng;Wu, Yiqiang
作者机构:
[Wu, Yiqiang; Li, Wenhao; Zuo, YF; Zuo, Yingfeng; Wang, Shu; He, Xiaoyu] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
通讯机构:
[Zuo, YF; Wu, YQ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词:
Bamboo fiber;In-situ solid phase polymerization;Polylactic acid;Composite plasticization;Compatible interface
摘要:
The in-situ reactive interfacial compatibilization and properties of polylactic acid-g-bamboo fiber (PLA-g-BF)/polylactic acid (PIA) composites, produced by blending with a three-component plasticizer, glycerol/formamide/tributyl citrate, were investigated. The PLA-g-BF/PLA composites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimeter (DSC), thermal gravimetric analyzer (TGA) and rotational rheometer, and the bending, tensile, and water resistance properties were also tested. The bending strength and elongation at break of PLA-g-BF/PLA composite reached 35.6 MPa and 5.59%, which increased by 19.3% and 30.1% relative to the ungrafted composites. The initial contact angle of the PLA-g-BF/PLA composite was 74.3 degrees, which was larger than that of the ungrafted composite (41.2 degrees), and the water absorption ratio reached 4.3% after 24 h, which was less than the unmodified material (6.1%). SEM results showed that PIA matrix showed smooth surfaces and the interfacial adhesion between modified BF and matrix PLA was greatly improved after grafting modification. The crystal structure results proved that the grafting treatment of BF strengthened the interfacial interactions between the filler BF and matrix PLA, and reduced the mobility of PLA molecular chain. The rotational rheometer illustrated that the initial storage modulus of PLA-g-BF/PLA composites was the largest and decreased slowly, which improved the processing properties of composites. (C) 2019 Elsevier B.V. All rights reserved.
语种:
英文
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Application of micro-FTIR spectroscopy to study molecular association of adsorbed water with lignin
作者:
Guo, Xin* ;Yuan, Hanmeng;Xiao, Teng;Wu, Yiqiang*
期刊:
International Journal of Biological Macromolecules ,2019年131:1038-1043 ISSN:0141-8130
通讯作者:
Guo, Xin;Wu, Yiqiang
作者机构:
[Guo, Xin; Yuan, Hanmeng] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Wu, Yiqiang; Xiao, Teng] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Guo, Xin; Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词:
Lignin;Molecular association;Molecular interactions
摘要:
As many properties of lignin are relied on moisture content, water adsorption is very important for its product performance. To better understand water adsorption mechanism of lignin, the molecular interactions between adsorbed water and lignin was studied using micro-FTIR spectroscopy. Spectra of lignin were collected at various relative humidity (RH) levels from low to high. From qualitative analysis of these spectra and corresponding difference spectra, water adsorption sites of lignin was recognized, and the spectral ranges closely related to water adsorption were identified. Further, from component peak analysis of the identified spectral region, three component peaks were attributed to three types of bound water separately. Based on the change of bound water vs. RH, the moisture adsorption process of lignin could be separated to three parts. Moreover, molecular association of adsorbed water with lignin was all demonstrated in these three parts. (C) 2019 Elsevier B.V. All tights reserved.
语种:
英文
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Cellulose nanofibrils enable flower-like BiOCl for high-performance photocatalysis under visible-light irradiation
作者:
Tian, Cuihua;Luo, Sha;She, Jiarong;Qing, Yan* ;Yan, Ning;...
期刊:
Applied Surface Science ,2019年464:606-615 ISSN:0169-4332
通讯作者:
Qing, Yan;Wu, Yiqiang
作者机构:
[Qing, Yan; Wu, Yiqiang; Tian, Cuihua; Luo, Sha; She, Jiarong; Liu, Zhichen] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Wu, Yiqiang; Qing, Yan] Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.;[Yan, Ning] Univ Toronto, Dept Chem Engn & Appl Chem, Toronto, ON M5S 2E8, Canada.;[Yan, Ning] Univ Toronto, Fac Forestry, Toronto, ON M5S 2E8, Canada.
通讯机构:
[Qing, Y; Wu, YQ] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词:
Cellulose nanofibrils;Flower-like BiOCl;Hydrophilic surface;Photocatalytic activity;Photosensitization
摘要:
Control the photocatalytic activity by texturing morphology and surface property is the fundamental and efficient process for the advanced applications of semiconductors. In this work, high-performance flower-like BiOCl (BOC) nanomaterials were fabricated employing sustainable cellulose nanofibrils (CNFs) as regulator through a facile one-pot hydrothermal method. The CNFs doped BiOCl (CBOC) formed flower-like morphology and the size was decreased. Ascribing to the enhanced photosensitization and photocatalysis, RhB could be totally degraded by CBOC-5 (5% of CNFs) within 16 min under visible light irradiation, exhibiting outstanding degradation efficiency. The roles of adsorption, photosensitization and photocatalysis of CBOC-5 to RhB and tetracycline (TC) were comprehensively studied. The [rad] O 2 − and holes were determined to be the active species during the RhB degradation in the presence of CBOC-5 under visible light irradiation and CBOC-5 showed excellent stability after 5 times repeated use. The crucial role of CNFs for the improved photocatalytic activity was mainly attributed to forming flower-like morphology, reducing the size of BOC and enhancing the hydrophilic surface, as a result, the absorption of visible light, migration of electron and the interaction of CBOC-5 with RhB were promoted remarkably, which enhanced both photosensitization and photocatalytic activity significantly. © 2018 Elsevier B.V.
语种:
英文
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木质素微纳米球的制备与应用研究现状
作者:
熊福全;王航;韩雁明;储富祥;吴义强
期刊:
林业科学 ,2019年55(8):170-175 ISSN:1001-7488
通讯作者:
Wu, Y.
作者机构:
中南林业科技大学材料科学与工程学院;[储富祥; 韩雁明] 中国林业科学研究院木材工业研究所;[王航; 吴义强; 熊福全] 中南林业科技大学
通讯机构:
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
关键词:
木质素微纳米球;自组装;溶剂-反溶剂;气溶胶的流式反应器;界面细乳液聚合
摘要:
在植物纤维原料中,木质素是仅次于纤维素的天然可再生资源,但由于结构复杂且不同类型木质素结构性能差异,其通常被认为是一种废料或低价值副产品。微纳米木质素是近年来兴起的新发展方向,可为木质素产品高值化利用提供一种新途径。木质素微纳米球是一种具有规整结构的微纳米木质素,其自组装制备方法主要有溶剂-反溶剂法、气溶胶的流式反应器法和界面细乳液聚合法。利用四氢呋喃、二氧六环和乙醇等溶剂对木质素或化学修饰木质素进行溶解,然后滴加反溶剂去离子水可获得木质素微纳米球,然而溶剂-反溶剂法获得的木质素微纳米球悬浮液在干燥过程中存在微纳米球团聚问题;气溶胶的流式反应器法能将木质素溶液直接雾化自组装成气溶胶;界面细乳液聚合法可使木质素分子在非共价自组装形成微纳米球基础上实现共价键结合。相比实心微纳米球,中空微纳米球拥有较高的比表面积。木质素微纳米球当前主要应用于药物载体、紫外防护和纳米填料等方面。采用木质素包载疏水药物,能提高药物在水溶液中的溶解性能,实现可控释放,延长作用时间,降低毒副作用;将木质素微纳米球用于光敏性农药的包载,能使其具有可控释放和抗光降解功效;将木质素微纳米球对酶进行包载,能使其具有较好的稳定性和催化活性。通过调控木质素自组装过程,可使其微纳米球具有相对亲水或疏水外表面,使微纳米球与相应亲水或疏水高分子聚合物共混时具有较强的分子间作用。此外,木质素微纳米球亦可用于吸附材料、聚集诱导发光纳米材料和锂离子电池电极材料等方面。目前,木质素微纳米球研究还处于起步阶段,其简单可行的可控构筑方法及其高值化应用领域需要进一步探索。界面细乳液聚合法能使木质素分子自组装过程中实现非共价键和共价键协同作用,且通过该方法可获得中空木质素微纳米球,为新型中空结构木质素微纳米球的开发提供了新方向;木质素具有自发荧光特性,且自组装制备微纳米球过程中木质素分子会产生J-聚集增强其荧光强度,为新型木质素基发光材料的开发提供了新思路。
语种:
中文
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An approach for in situ qualitative and quantitative analysis of moisture adsorption in nanogram-scaled lignin by using micro-FTIR spectroscopy and partial least squares regression.
作者:
Xiao, Teng;Yuan, Hanmeng;Ma, Qiang;Guo, Xin* ;Wu, Yiqiang
期刊:
International Journal of Biological Macromolecules ,2019年132:1106-1111 ISSN:0141-8130
通讯作者:
Guo, Xin
作者机构:
[Ma, Qiang; Xiao, Teng; Guo, Xin; Yuan, Hanmeng] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Wu, Yiqiang; Xiao, Teng] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Guo, Xin] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.
关键词:
Lignin;Qualitative and quantitative analysis;Micro-FTIR spectroscopy
摘要:
Moisture sorption has a great impact on the mechanical properties of lignin. To better characterize the moisture sorption of lignin, an approach for in situ qualitative and quantitative analysis of moisture adsorption in nanogram-scaled lignin by using micro-FTIR spectroscopy and partial least squares regression is introduced in this study. Spectra of nanogram-scaled lignin were collected within the relative humidity (RH) of 0%-92%. A qualitative analysis of these measured spectra confirmed the effective water sorption sites and determined spectral ranges related to moisture adsorption. Using these identified spectral ranges, a quantitative forecasting model for the moisture content (MC) of lignin was built and developed according to partial least square regression (R-2, 0.9996; RMSECV, 0.408; RMSEP, 0.118). Furthermore, the water sorption isotherm of lignin was acquired using the established forecasting model in which a very positive correlation between the estimated and measured MCs was demonstrated using a dynamic vapor sorption (DVS) setup. The results confirmed the practicability and effectiveness of this in situ qualitative and quantitative analysis approach. (C) 2019 Elsevier B.V. All rights reserved.
语种:
英文
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Three-dimensional "skin-framework" hybrid network as electroactive material platform for high-performance solid-state asymmetric supercapacitor
作者:
Xia, Liaoyuan* ;Hu, Shaoheng;Zhang, Xueqin;Huang, Le;Liao, Yu;...
期刊:
RSC Advances ,2019年9(23):12877-12885 ISSN:2046-2069
通讯作者:
Xia, Liaoyuan;Wu, Yiqiang;Lu, Xihong
作者机构:
[Huang, Le; Wu, Yiqiang; Liao, Yu; Xia, Liaoyuan; Hu, Shaoheng; Zhang, Xueqin; Qing, Yan; Jiang, Wenping; Xia, LY] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Huang, Le; Liao, Yu; Xia, Liaoyuan; Hu, Shaoheng; Zhang, Xueqin] Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.;[Lu, Xihong] Sun Yat Sen Univ, Sch Chem, MOE, Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.
通讯机构:
[Xia, LY; Wu, YQ; Xia, Liaoyuan] C;[Lu, Xihong] S;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface & Interface Sci &, Changsha 410004, Hunan, Peoples R China.;Sun Yat Sen Univ, Sch Chem, MOE, Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.
摘要:
Three-dimensional (3D) electrode materials are ideal candidates for use in fabricating high-performance supercapacitors (SCs), owing to their unique network structure and excellent electrochemical properties. In this study, an aerogel film produced by the freeze-drying self-aggregation of multiwall carbon nanotubes (MWCNTs) and cellulose nanofibers (CNFs) served as the "skin", and an inter-connected 3D network of nickel foam (NF) as the "framework", for the fabrication of an MWCNT/CNF-NF (called MCN) hybrid material with a distinct "skin-framework" architecture. Considering the metrics of excellent conductivity, high wettability, binder-free and unique 3D "skin-framework" structure, the MCN hybrid material has great potential as an electroactive material platform in constructing state-of-the-art asymmetric supercapacitor (ASC) electrodes. By incorporating MCN with electroactive manganese dioxide (MnO2) and active carbon (AC), MnO2-MCN and AC-MCN composite electrodes with respective high areal capacitances of 1784.8 (equal to 469.7 F g-1) and 868.8 mF cm-2 (equal to 126.3 F g-1) at 5 mA cm-2 were successfully prepared. Further, both kinds of electrodes exhibited high charge/discharge ability rates and good cycle performance. Moreover, an optimally assembled MnO2-MCN//AC-MCN solid-state ASC was reversibly charged/discharged at voltages as high as 1.8 V and possessed a remarkable volumetric capacity of 9.83 F cm-3 and an energy density of 4.25 mW h cm-3, as well as good cycle stability. © 2019 The Royal Society of Chemistry.
语种:
英文
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Vinyl Phosphate-Functionalized, Magnetic, Molecularly-Imprinted Polymeric Microspheres' Enrichment and Carbon Dots' Fluorescence-Detection of Organophosphorus Pesticide Residues
作者:
Wu, Mao;Fan, Yajun;Li, Jiawei;Lu, Danqing;Guo, Yaping;...
期刊:
Polymers ,2019年11(11) ISSN:2073-4360
通讯作者:
Xie, Lianwu;Wu, Yiqiang
作者机构:
[Fan, Yajun; Wu, Mao; Lu, Danqing; Li, Jiawei; Xie, Lianwu; Guo, Yaping] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Wu, Yiqiang] Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Xie, Lianwu; Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Changsha 410004, Hunan, Peoples R China.
关键词:
fluorescence detection;magnetic molecularly imprinted polymeric microspheres;organophosphorus pesticides;pesticide residues;sensor
摘要:
The rapid detection of organophosphorus pesticide residues in food is crucial to food safety. One type of novel, magnetic, molecularly-imprinted polymeric microsphere (MMIP) was prepared with vinyl phosphate and 1-octadecene as a collection of dual functional monomers, which were screened by Gaussian09W molecular simulation. MMIPs were used to enrich organic phosphorus, which then detected by fluorescence quenching in vinyl phosphate-modified carbon dots ([email protected]) originated from anhydrous citric acid. MMIPs and [email protected] were characterized by TEM, particle size analysis, FT-IR, VSM, XPS, adsorption experiments, and fluorescence spectrophotometry in turn. Through the fitting data from experiment and Gaussian quantum chemical calculations, the molecular recognition properties and the mechanism of fluorescence detection between organophosphorus pesticides and [email protected] were also investigated. The results indicated that the MMIPs could specifically recognize and enrich triazophos with the saturated adsorption capacity 0.226 mmol g-1, the imprinting factor 4.59, and the limit of recognition as low as 0.0006 mmol L-1. Under optimal conditions, the [email protected] sensor has shown an extensive fluorescence property with a LOD of 0.0015 mmol L-1 and the linear range from 0.0035 mmol L-1 to 0.20 mmol L-1 (R2 = 0.9988) at 390 nm. The mechanism of fluorescence detection of organic phosphorus with [email protected] sensor might be attributable to hydrogen bonds formed between heteroatom O, N, S, or P, and the O-H group, which led to fluorescent quenching. Meanwhile, HN-C=O and Si-O groups in [email protected] system might contribute to cause excellent blue photoluminescence. The fluorescence sensor was thorough successfully employed to the detection of triazophos in cucumber samples, illustrating its tremendous value towards food sample analysis in complex matrix. © 2019 by the authors.
语种:
英文
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Natural-Cellulose-Nanofibril-Tailored NiFe Nanoparticles for Efficient Oxygen Evolution Reaction
作者:
Tian, Cuihua;Liu, Zhichen;Wu, Yiqiang* ;Lu, Xihong;Yang, Tianyun;...
期刊:
ChemElectroChem ,2019年6(13):3303-3310 ISSN:2196-0216
通讯作者:
Wu, Yiqiang;Qing, Yan
作者机构:
[Tao, Xu; Yang, Tianyun; Wu, Yiqiang; Tian, Cuihua; Qing, Yan; Liu, Zhichen] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Wu, Yiqiang; Qing, Yan] Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.;[Lu, Xihong] Sun Yat Sen Univ, Sch Chem, Guangzhou 510275, Guangdong, Peoples R China.
通讯机构:
[Wu, YQ; Qing, Y] C;[Wu, YQ; Qing, Y] H;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.
关键词:
cellulose nanofibrils;NiFe electrocatalyst;tailoring performance;high efficiency;oxygen evolution reaction
摘要:
High performance, resource abundance, and environmental friendliness have been raising as major challenges for the next-generation of affordable and sustainable electrocatalysts. Herein, natural cellulose nanofibrils (CNFs) with abundant carboxyls and hydroxyls were employed to tailor NiFe catalysts (NiFeNSC) for the efficient oxygen evolution reaction (OER). Benefiting from the introduction of CNF, the NiFe metal ions were homogeneously dispersed on the CNF surface and exhibited a smaller particle size. Additionally, the surface area was 3.17 times larger and the surface wettability was significantly improved. By integrating the active NiFe nanoparticles with doped CNF, the overpotential of synthesized NiFeNSC catalyst was decreased from 370 mV to 244 mV to deliver a current density of 10 mA cm−2, and exhibited a small Tafel slope of 43.3 mV dec−1 in 1.0 M KOH electrolyte. Impressively, the NiFeNSC displayed excellent long-term stability, which was only 38 mV increased over 24 h chronopotentiometry measurement, outperforming the catalyst without CNF (NiFeNS) and commercial RuO2 catalyst remarkably. The present results demonstrate a new avenue for designing resource abundant and sustainable electrocatalysts, providing a novel strategy to replace the fossil-involved nanocarbon. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
语种:
英文
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Functional nanocomposites from sustainable regenerated cellulose aerogels: A review
作者:
Wan, Caichao* ;Jiao, Yue;Wei, Song;Zhang, Luyu;Wu, Yiqiang* ;...
期刊:
Chemical Engineering Journal ,2019年359:459-475 ISSN:1385-8947
通讯作者:
Wan, Caichao;Wu, Yiqiang;Li, Jian
作者机构:
[Wei, Song; Wu, Yiqiang; Wan, CC; Wan, Caichao; Zhang, Luyu] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Jiao, Yue; Li, Jian] Northeast Forestry Univ, Mat Sci & Engn Coll, Harbin 150040, Heilongjiang, Peoples R China.
通讯机构:
[Wan, CC; Wu, YQ] C;[Li, Jian] N;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Northeast Forestry Univ, Mat Sci & Engn Coll, Harbin 150040, Heilongjiang, Peoples R China.
关键词:
Regenerated cellulose;Aerogels;Functional nanocomposites;Applications
摘要:
Creation of eco-friendly and high-performance nanocomposites has become one of the most widely concerned focuses. Regenerated cellulose aerogels (RCAs), the typical green sustainable 3D cellulose products, have numerous merits including large surface area, high porosity, low density, high mechanical strength, 3D network structure and abundant oxygen-containing groups, which make them ideal candidates as green matrices to support various active nanomaterials for the development of novel functional nanocomposites. Therefore, RCAs open up a new promising avenue to create novel enticing materials with desired and tunable properties. Also, it is of great significance to search exact modification or adulteration technologies to create RCAs-based nanocomposites for advanced applications. In addition, to make RCAs more applicable and valuable, a deep understanding of the relationship between the structure (mainly dependent on the dissolution, regeneration and drying techniques) and property of RCAs is also necessary. Here, this review article highlights recent advances in the field of RCAs-based functional nanocomposites. The synthetic processes and mechanisms and representative physicochemical properties are also emphasized. We hope that this review work could play a certain guiding role for the study and creation of green RCAs-based functional materials and stimulate a wider range of studies and collaborations, leading to significant progress in this area. © 2018 Elsevier B.V.
语种:
英文
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Chiral nematic assemblies of silver nanoparticles in cellulose nanocrystal membrane with tunable optical properties
作者:
Liu, Liu;Wang, Lijun;Luo, Sha;Qing, Yan* ;Yan, Ning;...
期刊:
Journal of Materials Science ,2019年54(8):6699-6708 ISSN:0022-2461
通讯作者:
Qing, Yan;Wu, Yiqiang
作者机构:
[Qing, Yan; Wu, Yiqiang; Wang, Lijun; Liu, Liu; Yan, Ning; Luo, Sha] Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Shaoshan South Rd 498, Changsha 410004, Hunan, Peoples R China.;[Qing, Yan; Wu, Yiqiang] Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Shaoshan South Rd 498, Changsha 410004, Hunan, Peoples R China.;[Yan, Ning] Univ Toronto, Fac Forestry, 27 Kings Coll Cir, Toronto, ON M5S 1A1, Canada.
通讯机构:
[Qing, Y; Wu, YQ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, Shaoshan South Rd 498, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Shaoshan South Rd 498, Changsha 410004, Hunan, Peoples R China.
摘要:
Cellulose nanocrystals (CNCs) possessing chiral nematic structures have been developed as liquid crystal templates for optical materials and devices. These templates provide materials with advanced structural and optical properties, leading to numerous promising discoveries of new functional materials. In this work, the chiral nematic CNC/silver nanoparticles (CNC/AgNPs) composite membranes were prepared and displayed striking iridescent colors. The addition of AgNPs strengthened the chiral structure of CNC-based composites by adjusting the pitch of the chiral nematic structure. As the AgNPs content decreased from 8 to 2 wt%, a redshift of the reflection wavelength was observed from 475 to 773 nm, and the distance between the two adjacent layers of the membrane increased from 155 to 254 nm, according to a fitted linear function. Therefore, this composite membrane exhibited excellent chiral optical properties, and the chiral reflectance could be tuned accurately by regulating the content ratio of CNCs to AgNPs. New insights into designing advanced functional optics were provided, herein to show their potential applications, such as in smart windows and anti-counterfeit labels. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.
语种:
英文
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纳米TiO_2改性脲醛树脂中游离甲醛的光催化降解研究
作者:
卿彦;关鹏飞;詹满军;陈秀兰;刘文杰;...
期刊:
中南林业科技大学学报 ,2019年39(7):108-113,142 ISSN:1673-923X
作者机构:
中南林业科技大学材料科学与工程学院;[詹满军] 广西丰林木业集团股份有限公司;[陈秀兰] 大亚人造板集团有限公司;[卿彦; 刘文杰; 吴义强; 李新功; 罗莎; 刘明; 关鹏飞] 中南林业科技大学
关键词:
游离甲醛;锐钛矿型二氧化钛;紫外光;光催化;降解
摘要:
如何降低游离甲醛含量一直是脲醛树脂研究的热点之一。采用锐钛矿型纳米二氧化钛(TiO_2)改性脲醛树脂,探索在紫外光(波长λ=365 nm)照射下,纳米TiO_2对脲醛树脂中游离甲醛的催化降解效果。通过分析脲醛树脂中游离甲醛的含量,研究了光照类型、时间以及纳米TiO_2的含量对光降解甲醛的影响。使用傅里叶变换红外光谱(FTIR)、同步热分析(TG)表征了光催化降解游离甲醛对脲醛树脂化学结构及热性能的影响。结果表明:在脲醛树脂的降醛处理中,加入尿素质量1 %的锐钛矿型纳米TiO_2,室温下紫外光照时长48 h,可以获得36.7 %的游离甲醛降解率。紫外光照可以促进脲醛树脂的固化,使其固含量和粘度上升,固化时间缩短,但对脲醛树脂的化学结构和热性能没有明显影响。
语种:
中文
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间苯二酚-双醛淀粉-甲醛共缩聚树脂胶黏剂制备
作者:
李萍;吴义强;刘文杰;左迎峰;吕建雄;...
期刊:
高分子材料科学与工程 ,2019年35(1):122-129 ISSN:1000-7555
通讯作者:
Zuo, Yingfeng(zuoyf1986@163.com)
作者机构:
[李萍; 吴义强; 刘文杰; 左迎峰; 屠茹茹] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[吕建雄] Research Institute of Wood Industry, Chinese Academy of Forest, Beijing;100091, China;[李萍; 吴义强; 刘文杰; 左迎峰; 屠茹茹] 410004, China
通讯机构:
[Zuo, Y.] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
关键词:
间苯二酚;双醛淀粉;共缩聚;合成工艺;化学结构;固化性能
摘要:
以玉米淀粉为原料,通过高碘酸钠在酸性条件下氧化得到双醛淀粉。将双醛淀粉与甲醛一起作为醛基给予体,与间苯二酚(R)共缩聚制备间苯二酚-双醛淀粉-甲醛(RDSF)树脂胶黏剂。研究了双醛淀粉用量、共反应p H、共反应温度和共反应时间对RDSF树脂胶黏剂固体含量、黏度、固化时间和胶接强度的影响。结果表明,双醛淀粉加入量为0. 15mol,共反应p H值为9. 0,共反应温度为70℃,共反应时间为90 min时,制得的RDSF树脂胶黏剂综合性能最佳,此时固体含量为42. 59%,黏度为725 m Pa·s,固化时间为53 s,干状胶合强度为1. 38 MPa,湿状胶合强度为1. 17 MPa。傅里叶变换红外光谱测试发现RDSF树脂的结构近似于间苯二酚-甲醛(RF)树脂,表明RDSF树脂可代替RF树脂使用。差示扫描量热分析发现RDSF树脂的固化温度和固化焓值低于RF树脂,固化峰值温度为77. 43℃,固化焓值为-238. 91 J/g,表明其固化能耗更低。
语种:
中文
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