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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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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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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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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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;Micro-FTIR spectroscopy;Qualitative and quantitative analysis
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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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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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;Compatible interface;Composite plasticization;In-situ solid phase polymerization;Polylactic acid
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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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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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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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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NaOH and Ba(OH)(2) Compound Catalyzed Phenol-Resorcinol-Formaldehyde Copolycondensation Resin Adhesive for Recombined Bamboo
作者：
Zuo, Yingfeng;Liu, Wenjie;Xiao, Junhua;Li, Xianjun;Zhao, Xing;...
期刊：
武汉理工大学学报(材料科学版)(英文版) ,2019年34(2):459-464 ISSN：1000-2413
通讯作者：
Wu, Yiqiang
作者机构：
[Xiao, Junhua; Wu, Yiqiang; Zuo, Yingfeng; Liu, Wenjie; Li, Xianjun; Zhao, Xing] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Wu, Yiqiang; Zuo, Yingfeng; Li, Xianjun; Zhao, Xing] Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, 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.;Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.
关键词：
phenol-formaldehyde resin;NaOH;Ba(OH)(2);compound catalytic;resorcinol;recombined bamboo
摘要：
In order to reduce the curing temperature, shorten the curing time of phenol- formaldehyde (PF) resin adhesive, and ensure the good water-solubility, NaOH and Ba(OH)<inf>2</inf> were used as compound catalysts. The influences of the adding time of Ba(OH)<inf>2</inf>, the adding amount of NaOH, Ba(OH)<inf>2</inf> and resorcinol on the properties of adhesives were studied. The properties of NaOH catalyzed phenol-formaldehyde (PF) adhesive, NaOH and Ba(OH)<inf>2</inf> compound catalyzed PF adhesive, NaOH and Ba(OH)<inf>2</inf> compound catalyzed phenol-resorcinol-formaldehyde (PRF) adhesive, and the prepared recombinant bamboo with three kinds of adhesives were compared. The experimental results show that NaOH and Ba(OH)<inf>2</inf> compound catalyst not only shortens the curing time of PF adhesive, but also guarantees the suitable water solubility of adhesive. After copolycondensation with resorcinol, the curing time of adhesive is further shortened, the water solubility is improved obviously, and the highest bonding strength is obtained. Infrared spectrum analysis shows that the reaction activity point of NaOH and Ba(OH)<inf>2</inf> compound catalyzed PRF adhesive will increase, so that both the curing temperature and curing enthalpy decrease.<br/> ©2019, Wuhan University of Technology and Springer-Verlag GmbH Germany, 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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秸秆人造板制造及应用研究进展
作者：
李萍;左迎峰;吴义强;赵星;王健
期刊：
材料导报 ,2019年33(15):2624-2630 ISSN：1005-023X
通讯作者：
Zuo, Yingfeng(zuoyf1986@163.com)
作者机构：
[李萍; 左迎峰; 吴义强; 赵星; 王健] College of Material Science & Engineering, Central South University of Forestry & Technology, Changsha;410004, China;College of Art & Design, Xiangnan University, Chenzhou;423000, China;[李萍] 410004, China<&wdkj&>College of Art & Design, Xiangnan University, Chenzhou
关键词：
秸秆人造板;胶合界面;胶黏剂;成型工艺;改性机理
摘要：
为缓解我国木材供需矛盾,提高秸秆利用率和附加值,将秸秆用于生产人造板是一种有效的途径。本文基于几种常见的秸秆人造板及其特性,从产业发展和技术研究角度阐述了国内外秸秆人造板发展情况。针对秸秆人造板制造中存在的问题,从界面胶合机理及改性、胶黏剂制备与改性、成型工艺的选择与参数确定三个方面对提高秸秆人造板胶合强度、环保性能、生产能耗、生产成本和生产效率等进行了综述,并介绍了秸秆人造板在家具、地板、室内装饰和建筑墙体中的应用情况。同时,针对秸秆人造板在制备和改性机理研究及推广应用方面存在的不足,提出了进一步的研究建议。
语种：
中文
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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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Moisture adsorption in TEMPO-oxidized cellulose nanocrystal film at the nanogram level based on micro-FTIR spectroscopy
作者：
Yuan, Hanmeng;Guo, Xin* ;Xiao, Teng;Ma, Qiang;Wu, Yiqiang
期刊：
Cellulose ,2019年26(12):7175-7183 ISSN：0969-0239
通讯作者：
Guo, Xin
作者机构：
[Ma, Qiang; 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：
Cellulose nanocrystal film;Quantitative prediction model;Moisture adsorption;Micro-FTIR spectroscopy
摘要：
The adsorbed water is known to have a significant influence on physical property of cellulose nanocrystal film. In order to characterize moisture adsorption of TEMPO oxidized cellulose nanocrystal film (TOCNF), a strategy for quantitative evaluation of moisture adsorption in TOCNF at the nanogram level is proposed here. In this approach, TOCNF spectra were in situ measured in a large range of relative humidity. Spectral analysis was applied to these measured spectra, and then moisture adsorption sites and spectrum ranges affected by moisture adsorption were identified. Based upon these confirmed spectrum ranges and moisture contents collected using dynamic vapor sorption apparatus, a micro-FTIR prediction model could be established using partial least squares regression. Afterwards, the established prediction model was used for acquiring moisture adsorption isotherm, and a good consistency between the forecasts and referential values was shown. It was confirmed this proposed strategy for quantitative evaluation of moisture adsorption in nanocellulose film at the nanogram level was effective. © 2019, Springer Nature B.V.
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：
Aerogels;Applications;Functional nanocomposites;Regenerated cellulose
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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UF/PDMI组合胶黏剂在刨花板生产中的应用
作者：
刘明;陈秀兰;詹满军;李新功;吴义强
期刊：
林产工业 ,2019年56(10):13-18 ISSN：1001-5299
作者机构：
中南林业科技大学材料科学与工程学院,长沙,410004;大亚人造板集团有限公司,镇江,212300;广西丰林木业集团股份有限公司,南宁,530031;[詹满军] 广西丰林木业集团股份有限公司;[吴义强; 李新功; 刘明] 中南林业科技大学
关键词：
刨花板;脲醛树脂;聚合异氰酸酯;物理力学性能;节能
摘要：
采用脲醛树脂(UF)/聚合异氰酸酯(PDMI)组合胶黏剂,以不同的组合配比在较低热压温度(160℃)条件下用高含水率(9.0％)杂木刨花制备刨花板,检测其静曲强度、内结合强度以及2 h和24 h吸水厚度膨胀率.结果表明:聚合异氰酸酯(PDMI)的引入,可以显著提高刨花板的物理力学性能和耐水性能;将刨花终含水率提高至9.0％可节约刨花干燥能耗达13.0％以上;与脲醛树脂胶黏剂(UF)相比,使用PDMI/UF配比为1:9的(10.0 wt％PDMI)组合胶黏剂可以提高刨花板静曲强度80％,提高内结合强度150％;在不添加防水剂的条件下,可以将板材的2 h吸水厚度膨胀率由31.0％提高至21.0％.该研究可为刨花板节能环保生产提供新思路.
语种：
中文
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Thermally-induced all-damage-healable superhydrophobic surface with photocatalytic performance from hierarchical BiOCl
作者：
Jia, Shanshan;Lu, Yao;Luo, Sha;Qing, Yan* ;Wu, Yiqiang* ;...
期刊：
Chemical Engineering Journal ,2019年366:439-448 ISSN：1385-8947
通讯作者：
Qing, Yan;Wu, Yiqiang
作者机构：
[Qing, Yan; Wu, Yiqiang; Luo, Sha; Jia, Shanshan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Lu, Yao] UCL, Dept Mech Engn, London WC1E 7JE, England.;[Wu, Yiqiang; Qing, Yan] Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.;[Parkin, Ivan P.] UCL, Dept Chem, 20 Gordon St, London WC1H 0AJ, England.
通讯机构：
[Qing, Y; Wu, YQ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
All-damage-healable;Biomimetic;Controllable photocatalytic property;Lignocellulose;Superhydrophobic surface
摘要：
Preparation of superhydrophobic surfaces capable of recovering both the surface chemistry and hierarchical structure is still a challenge. In this work, all-damage-healable superhydrophobic surface was fabricated by assembly of superhydrophobic and hierarchical BiOCl on lignocellulosic substrates. Fibers having thermally responsive behavior, the main component of lignocellulosic materials, act as the underlying movable substrates. By a simple heating treatment, fibers can convey the undamaged neighbored superhydrophobic coating to the damaged area. In this way, the loss of superhydrophobicity caused by rigorous mechanical destructions, even deep cuts of one hundred of micrometers wide, can be restored, mimicking the self-healing mechanism of human skin. Superior self-healing ability in surface chemistry was also confirmed. Meanwhile, the as-prepared superhydrophobic surfaces demonstrated reliable photocatalytic ability, a useful property for resisting organic contaminations. Interestingly, it was found that the photocatalytic activity can be enhanced by tuning the surface wettability. This work reported the first use of substrate material's inherently thermally responsive property to demonstrate self-healing superhydrophobic surface with photocatalyticity, which not only promotes the application of superhydrophobic materials in complex environment, but also opens up a new perspective in designing durable superhydrophobic materials. © 2019 Elsevier B.V.
语种：
英文
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基于响应曲面法优化酸解氧化制备高醛基含量的双醛淀粉的工艺条件
作者：
左迎峰;李萍;屠茹茹;赵星;袁光明;...
期刊：
材料导报 ,2019年33(1):335-341 ISSN：1005-023X
通讯作者：
Wu, Y.
作者机构：
[李萍; 屠茹茹; 赵星; 袁光明; 左迎峰; 吴义强] School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
[Wu, Y.] S;School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
关键词：
酸解氧化;双醛淀粉;制备工艺;醛基含量;响应曲面法;性能表征
摘要：
本工作采用响应曲面法优化了一步酸解氧化制备双醛淀粉的工艺,以玉米淀粉为原料、盐酸（HCl）为酸解剂、高碘酸钠（NaIO4）为氧化剂,设置HCl浓度、淀粉乳浓度、反应温度和反应时间为变量。傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）分析证明本实验成功制得了双醛淀粉。采用旋转黏度计、扫描电子显微镜（SEM）、X射线衍射仪（XRD）和热重分析仪（TGA）对双醛淀粉的糊化性能、颗粒形貌、结晶结构和热性能进行了表征。结果表明,对醛基含量的影响大小依次为反应温度>反应时间>淀粉乳浓度> HCl浓度。最佳制备工艺为:HCl浓度为1. 2mol/L,淀粉乳浓度为7%,反应温度为49℃,反应时间为4 h。在该条件下制得的双醛淀粉的醛基含量为85. 17%,与理论最大值86. 26%接近,说明优化结果可信。酸解氧化后,双醛淀粉的糊化黏度降至30 mPa·s,可显著提高反应活性和可操作性。SEM分析显示,双醛淀粉颗粒中间凹陷,呈现出环状结构。XRD分析表明,淀粉的结晶结构发生破坏,重结晶使结晶度增大至36. 05%。TGA分析表明,双醛淀粉受热分解起始温度降低,但分解残余率提高,说明其热塑性和热稳定性有所提高。
语种：
中文
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