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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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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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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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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Scalable Top-to-Bottom Design on Low Tortuosity of Anisotropic Carbon Aerogels for Fast and Reusable Passive Capillary Absorption and Separation of Organic Leakages.
作者：
Wan, Caichao* ;Jiao, Yue;Wei, Song;Li, Xianjun;Tian, Wenyan;...
期刊：
ACS Applied Materials & Interfaces ,2019年11(51):47846-47857 ISSN：1944-8244
通讯作者：
Wan, Caichao;Wu, Yiqiang;Li, Jian
作者机构：
[Wei, Song; Wu, Yiqiang; Wan, CC; Wan, Caichao; Tian, Wenyan; Li, Xianjun] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Jiao, Yue; Li, Jian] Northeast Forestry Univ, Mat Sci & Engn Coll, Harbin 150040, 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, Peoples R China.;Northeast Forestry Univ, Mat Sci & Engn Coll, Harbin 150040, Peoples R China.
关键词：
absorbents;absorption recyclability;absorption selectivity;anisotropic structure;capillary absorption;carbon aerogels;top-to-bottom design
摘要：
Creation of sustainable, cost-effective, and scalable absorbents with ideal absorption properties is a worldwide challenge because many high-performance absorbents are still restricted in laboratory scope due to several critical defects (like complex and eco-unfriendly synthesis process, high cost, and difficulty in large-scale production). Herein, a facile and scalable top-to-bottom design is proposed to create a kind of novel anisotropic carbon aerogels with low tortuosity of stacked laminated structure, derived from the hierarchical cellular channels of balsa wood. By virtue of this unique structure and favorable oleophilicity, fast passive capillary absorption with low flow resistance is achieved (as demonstrated by the theoretical modeling). As a result, the anisotropic carbon aerogels have quite sensitive selectivity to separate organic pollutants from water, broad-spectrum and high absorption capacity for different organic liquids (13 277-31 597 mg g-1), and superior recyclability (98.7% absorption capacity retention after five cycles). Combining these outstanding performances with a cheap preparation strategy as well as good environmental friendliness, this work provides a kind of potential scalable materials for efficient reusable absorption and separation of organic leakages. © 2019 American Chemical Society.
语种：
英文
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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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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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Manipulation of Nanoplate Structures in Carbonized Cellulose Nanofibril Aerogel for High-Performance Supercapacitor
作者：
Zhang, Zhen;Li, Lei;Qing, Yan* ;Lu, Xihong;Wu, Yiqiang* ;...
期刊：
Journal of Physical Chemistry C ,2019年123(38):23374-23381 ISSN：1932-7447
通讯作者：
Qing, Yan;Wu, Yiqiang
作者机构：
[Yang, Wen; Qing, Yan; Wu, Yiqiang; Zhang, Zhen; Li, Lei] Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Lu, Xihong] Sun Yat Sen Univ, Sch Chem, KLGHEI Environm & Energy Chem, MOE Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.;[Yan, Ning] Univ Toronto, Fac Forestry, Toronto, ON M5S 3E8, Canada.
通讯机构：
[Qing, Y; Wu, YQ] C;Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
摘要：
The internal structure of carbon aerogels (CAs) is a key factor affecting their electrochemical performance and applications. In this study, the morphology of CAs and their effects on electrochemical properties were investigated via the control of the carbonization temperature. CAs were prepared by freeze-drying combined with high-temperature carbonization using wood cellulose as the raw material. The nanoplate and nanofiber structures of CAs were manipulated via the control of the carbonization temperature. Results revealed that the volume shrinkage as well as independent nanofibers of CAs increase with temperature, but the nanoplate structure decreases. The nanofiber and nanoplate structures affect the specific surface area (SSA) and electrochemical performance of carbon materials. At a temperature of 800 degrees C, the highest SSA and total pore volume of CAs were observed, with excellent electrochemical stability (after 5000 cycles of cyclic voltammetry testing, it can still keep 89.43% of the original specific capacitance), and a specific capacitance up to 172.7 F g(-1). Finally, a symmetrical supercapacitor device was assembled using the CAs, which exhibited a desirable energy density of 4.5 Wh kg(-1). And the results obtained from this study can be conducive to the applications of nanoscale CAs in energy storage.
语种：
英文
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人造板用棉籽粉基胶粘剂改性研究
作者：
刘明;陈秀兰;詹满军;吴义强;刘元;...
期刊：
中国胶粘剂 ,2019年28(05):25-30 ISSN：1004-2849
作者机构：
中南林业科技大学材料科学与工程学院,湖南长沙,410004;大亚人造板集团有限公司,江苏镇江,212300;广西丰林木业集团股份有限公司,广西南宁,530031;[李贤军; 卿彦; 吴义强; 李新功; 刘元; 刘明] 中南林业科技大学;[詹满军] 广西丰林木业集团股份有限公司
关键词：
胶粘剂;棉籽粉;人造板;黏度
摘要：
研究了碱处理、尿素改性、碱和尿素联合改性以及淀粉基胶粘剂共混对棉籽粉基胶粘剂理化性质及物理力学性能的影响。研究结果表明:改性方法对棉籽粉基胶粘剂干状胶合强度（≥4.0 MPa）无明显影响,并且碱和尿素联合改性可以将棉籽粉基胶粘剂的黏度从51.0 mPa·s提高至128.5 mPa·s。而使用高黏度淀粉基胶粘剂与棉籽粉基胶粘剂共混制得的复合胶粘剂的黏度高于530 mPa·s;尿素对棉籽粉中的棉蛋白具有一定的活化作用,淀粉基胶粘剂并未对棉籽粉化学官能团产生影响;获得的棉籽粉基胶粘剂符合人造板生产工艺要求,为其工业化利用提供支持。
语种：
中文
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Texturing commercial epoxy with hierarchical and porous structure for robust superhydrophobic coatings
作者：
Jia, Shanshan;Deng, Songlin;Luo, Sha;Qing, Yan* ;Yan, Ning;...
期刊：
Applied Surface Science ,2019年466:84-91 ISSN：0169-4332
通讯作者：
Qing, Yan;Wu, Yiqiang
作者机构：
[Qing, Yan; Wu, Yiqiang; Deng, Songlin; Yan, Ning; Luo, Sha; Jia, Shanshan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Qing, Yan; Wu, Yiqiang] Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.;[Yan, Ning] Univ Toronto, Fac Forestry, Toronto, ON M5S 3B3, Canada.
通讯机构：
[Qing, Y; Wu, YQ] 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：
Adhesive cushioning;Robustness and stability;Superhydrophobic coatings;Versatility
摘要：
The practical application of superhydrophobic coatings is restricted majorly by stability issues, especially in such cruel conditions as acid rain, pollutant contamination, and mechanical abrasion. In this work, we demonstrated a new type of superhydrophobic coatings with remarkable robustness and versatility using commercial epoxy as main building block. The hierarchical and porous structure was achieved by texturing micrometer-sized pores on the adhesive coatings, in which the SiO 2 nanoparticles were embedded. Due to strong substrate adhesion, excellent internal bonding, and micropore cushioning, the as-prepared superhydrophobic adhesive coatings can avoid the consumption of hierarchical structure after each abrasion and tightly anchor itself on substrate as well as soften the pressure during the mechanical force acting on them. The synergistic effect of these three protection mechanisms contributes to preferable mechanical robustness under severe sandpaper abrasions, cyclic tape peels, and knife scratches. This functional coating also can remain superhydrophobic after long-term exposure to a large variety of media, including corrosive solutions, daily consumed liquids, and water at different temperatures. Simultaneously, the epoxy resin has good compatibility with both hard and soft substrates, and thus providing such superhydrophobic adhesive coatings with high versatility for the applications in advanced functional materials. The concept of transforming commercial adhesive into superhydrophobic surface provides a simple and versatile approach to highly robust superhydrophobic materials. © 2018
语种：
英文
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聚乳酸接枝淀粉原位固相聚合工艺优化研究
作者：
何啸宇;徐冰杰;李萍;吴义强;左迎峰
期刊：
功能材料 ,2019年50(3):3118-3122 ISSN：1001-9731
通讯作者：
Zuo, Y.
作者机构：
[徐冰杰; 李萍; 吴义强; 何啸宇; 左迎峰] School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
[Zuo, Y.] S;School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
关键词：
淀粉;乳酸;原位固相聚合;工艺优化;疏水性;分子量及分布
摘要：
为减少淀粉分子链中的亲水羟基,从而提高其与聚乳酸(PLA)树脂的界面相容性,以玉米淀粉为原料,乳酸为接枝单体,辛酸亚锡为催化剂,通过原位固相聚合法制备得到具有一定疏水性能的聚乳酸接枝淀粉(PLA-g-淀粉)。采用正交试验法研究了单体比例、反应温度和反应时间对PLA-g-淀粉接枝率的影响,通过直观分析和显著性分析优化了原位固相聚合工艺,并对疏水性、分子量及分布、糊化粘度进行了分析。结果表明,PLA-g-淀粉制备的最优工艺条件为单体比例25%、反应温度100℃和反应时间为2 h,在此工艺条件下制得PLA-g-淀粉的接枝率为20.78%。经过原位固相接枝改性后,淀粉的疏水性能得到显著改善,数均分子量(M_n)、重均分子量(M_w)、z均分子量(M_z)和分布指数(DI)都不同程度增大,糊化粘度也相应得到增大。
语种：
中文
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Mold resistance of bamboo treated with copper complexes-grafted silica gel and its microdistribution in treated bamboo
作者：
Yang, Shoulu;Luo, Sha;Huang, Anxiang;Luo, Yang;Li, Dan;...
期刊：
JOURNAL OF WOOD SCIENCE ,2019年65(1):1-8 ISSN：1435-0211
通讯作者：
Wu, Yiqiang;Ji, Ning
作者机构：
[Wu, Yiqiang; Yang, Shoulu; Luo, Sha] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha, Hunan, Peoples R China.;[Li, Dan; Yang, Shoulu; Ji, Ning; Huang, Anxiang; Luo, Yang] Guizhou Acad Forestry, Guiyang 550005, Guizhou, Peoples R China.
通讯机构：
[Wu, Yiqiang] C;[Ji, Ning] G;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha, Hunan, Peoples R China.;Guizhou Acad Forestry, Guiyang 550005, Guizhou, Peoples R China.
关键词：
Bamboo;TEOS;APTES;HSM;Mold resistance;Microdistribution
摘要：
Bamboo is readily discolored by mold fungi, which greatly limits its applications. An effective antifungal agent, copper(II) chloride (CuCl2)-grafted silica gel, was prepared by a sol-gel process using tetraethoxysilane (TEOS)/3-aminopropyltriethoxysilane (APTES) mixtures. The elemental composition and the chemical combinations of homogeneous sol mixture (HSM) and bamboo were determined via Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy with energy-dispersive X-ray spectrometry (SEM-EDS). The mold resistance of bamboo treated with HSM, alkaline copper quat (ACQ), chromated copper arsenate (CCA), and purified water was characterized by an indoor mold test. The micro-morphology of bamboo treated with HSM was investigated using scanning electron microscopy (SEM). HSM penetrated into the bamboo vessels, and formed xerogels, which was able to coordinate copper(II) cations. SEM-EDS investigations suggest that Si-O-Cu linkages may be formed through an exchange reaction between silanol groups and copper complexes. The bamboo samples treated with HSM showed highly efficient mold resistance due to a good penetration of HSM. Furthermore, no fungal hyphae were found in the structure of HSM-treated bamboo after a 5-week mold test. The copper complexes grafted to silica gel developed in this work provide an efficient antifungal agent for a wide range of potential applications in bamboo protection.
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英文
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Obtaining nanofibers from lignocellulosic residues after bioethanol production
作者：
Liu, Liu;Sun, Xiaojun;Zhang, Lin;Qing, Yan* ;Yan, Ning;...
期刊：
Cellulose ,2019年26(6):3725-3734 ISSN：0969-0239
通讯作者：
Qing, Yan;Wu, Yiqiang
作者机构：
[Wu, Yiqiang; Sun, Xiaojun; Liu, Liu; Chen, Jienan; Yan, Ning; Zhang, Lin; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Technol, 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.;[Qing, Yan; Wu, Yiqiang] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
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：
Biomass residues;Nanofiber;Mechanical nanofibrillation;Energy storage
摘要：
Abstract: With wide use of biomass in various industries and enterprises, large amounts of biomass waste are being produced. This causes severe environmental issues and inadequate utilization of renewable resources. In this work, a sustainable and green process approach is proposed to utilize lignocellulosic biomass residues from biofuel conversion proceeding via direct mechanical treatments. The obtained nanofibers containing cellulose, lignin, and hemicellulose were directly isolated from lignocellulosic biomass residues and had diameters of approximately 21nm. After being treated via ultra-micro grinding for 0.5h with a millstone gap of approximately 5μm, and undergoing ultrasonication for 20min at 1000W as well as high-pressure homogenization shearing for 15 times in a chamber with 87μm diameter, partially hydrogen and covalent bonds between cellulose, lignin, and hemicellulose chains could be broken down. Lignin and hemicellulose were wrapped around the cellulose bundles, thus the residue nanofiber aerogels became easy to redisperse and redry in water. Additionally, the specific capacitance of carbonized nanofiber aerogels was up to 73.2Fg−1 at a current density of 1Ag−1. A remarkable reduction of specific capacitance happened along with the fermentation process prolongation and which is mainly related to the fermentation degree. With characteristics, such as special composite texture, high specific surface area, and excellent electrochemical performances, lignocellulosic biomass residue nanofibers displayed positive attributes in terms of energy storage and nanomaterials. Graphical abstract: [Figure not available: see fulltext.]. © 2019, Springer Nature B.V.
语种：
英文
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无机质增强木材研究进展与发展趋势
作者：
周亚;李萍;左迎峰;袁光明;李贤军;...
期刊：
材料导报 ,2019年33(17):2989-2996 ISSN：1005-023X
作者机构：
中南林业科技大学材料科学与工程学院,长沙,410004;[李贤军; 吴义强; 袁光明; 周亚; 左迎峰; 李萍] 中南林业科技大学
关键词：
人工林木材;无机质增强;直接浸注法;双剂扩散法;溶胶-凝胶法;插层复合法
摘要：
将人工林木材进行增强改性是改良木材材性和缓解木材供需矛盾的重要方法。由于常用有机物质增强木材存在环境污染和性能缺陷等问题,而无机质改性木材具有良好的力学性能、阻燃性能和耐腐性能,能最大限度地保留木材的视觉环境学特性,且其具有价格低廉、天然无毒等优良特性,逐渐成为研究者们的关注重点。本文介绍了无机质增强木材机理及特性,阐述了无机质增强木材的五种方法:直接浸注法、双剂扩散法、溶胶-凝胶法、插层复合法和其他方法,并分析了五种方法对改性木材性能的影响。提出了超声波辅助与无机质结合增强木材、无机-有机杂化和原位浸渍法增强木材的发展趋势,并指出了无机质增强木材研究仍需解决的问题。
语种：
中文
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Cr-Doped FeNi–P Nanoparticles Encapsulated into N-Doped Carbon Nanotube as a Robust Bifunctional Catalyst for Efficient Overall Water Splitting
作者：
Wu, Yiqiang;Tao, Xu;Qing, Yan* ;Xu, Han;Yang, Fan;...
期刊：
Advanced Materials ,2019年31(15):e1900178 ISSN：0935-9648
通讯作者：
Qing, Yan;Lu, Xihong
作者机构：
[Tao, Xu; Wu, Yiqiang; Xu, Han; Liu, Ming; Tian, Cuihua; Luo, Sha; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.;[Yang, Fan; Lu, Xihong] Sun Yat Sen Univ, Sch Chem, Key Lab Low Carbon Chem & Energy Conservat Guangd, MOE,Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.
通讯机构：
[Qing, Yan] C;[Lu, Xihong] S;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.;Sun Yat Sen Univ, Sch Chem, Key Lab Low Carbon Chem & Energy Conservat Guangd, MOE,Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.
关键词：
bifunctional catalyst;Cr doping;structural manipulation;transition metals phosphide;water splitting
摘要：
Exploring high-efficiency, stable, and cost-effective bifunctional electrocatalysts for overall water splitting is greatly desirable and challenging. Herein, a newly designed hybrid catalyst with Cr-doped FeNi–P nanoparticles encapsulated into N-doped carbon nanotubes (Cr-doped FeNi–P/NCN) with unprecedented electrocatalytic activity is developed by a simple one-step heating treatment. The as-synthesized Cr-doped FeNi–P/NCN with moderate Cr doping exhibits admirable oxygen evolution reaction and hydrogen evolution reaction activities with overpotentials of 240 and 190 mV to reach a current density of 10 mA cm −2 in 1 m KOH solution. When used in overall water splitting as a bifunctional catalyst, it needs only 1.50 V to give a current density of 10 mA cm −2 , which is superior to its typically integrated Pt/C and RuO 2 counterparts (1.54 V @ 10 mA cm −2 ). Density functional theory calculation confirms that Cr doping into a FeNi-host can effectively alter the relative Gibbs adsorption energy and reduces the theoretical overpotential. Additionally, the synergetic effects between Cr-doped FeNi–P nanoparticles and NCNs are regarded as significant contributors to accelerate charge transfer and promote electrocatalytic activity in hybrid catalysts. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
语种：
英文
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Preparation and characterization of resorcinol-dialdehyde starch-formaldehyde copolycondensation resin adhesive
作者：
Li, Ping;Wu, Yiqiang;Zhou, Ya;Zuo, Yingfeng*
期刊：
International Journal of Biological Macromolecules ,2019年127:12-17 ISSN：0141-8130
通讯作者：
Zuo, Yingfeng
作者机构：
[Zhou, Ya; Wu, Yiqiang; Li, Ping; Zuo, Yingfeng] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Li, Ping] Xiangnan Univ, Coll Art & Design, Chenzhou 423000, Hunan, Peoples R China.
通讯机构：
[Zuo, Yingfeng] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Resorcinol;Dialdehyde starch;Copolycondensation;Adhesive;Accelerated curing;Permeability
摘要：
A resorcinol-dialdehyde starch-formaldehyde (RDSF) copolycondensation resin adhesive was prepared by substituting high reactive dialdehyde starch fora portion of formaldehyde in the formulation. Fourier transforms infrared spectrometer (FTIR) analysis results confirmed that the copolycondensation reaction of the dialdehyde starch with resorcinol and formaldehyde was successful. The curing property, thermal stability, permeability and crystal structure of the RDSF adhesive were characterized using differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA), scanning electron microscope (SEM), X-ray diffraction (XRD). The solids content, viscosity, curing time, bonding strength were also obtained. The results showed that the RDSF adhesive had a higher solids content, moderate viscosity, shorter curing time and better bond strength than a standard resorcinol starch-formaldehyde (RSF) adhesive. It was found that dialdehyde starch could accelerate the curing rate, while decreasing the curing temperature and heat release during the curing process of RDSF. The dense cross linked structure of the dialdehyde starch and resorcinol-formaldehyde (RF) system produced improved thermal stability. SEM results showed that the RDSF adhesive formed a thin and continuous adhesive layer on the surface of a poplar board, and filled the pores of the wood, which improved the bond strength. The crystal structure of the RDSF was not altered by addition of the starch, and the physicochemical properties of the adhesive were similar to those of a normal resorcinol-formaldehyde resin. (C) 2018 Elsevier B.V. All rights reserved.
语种：
英文
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碱处理对竹纤维/聚乳酸可降解复合材料性能影响研究
作者：
左迎峰;李萍;刘文杰;李新功;江萍;...
期刊：
功能材料 ,2018年49(2):02006-02012 ISSN：1001-9731
通讯作者：
Wu, Y.
作者机构：
[左迎峰; 刘文杰; 李新功; 江萍; 吴义强; 李萍] 中南林业科技大学材料科学与工程学院;[李萍] 湘南学院美术与设计学院
通讯机构：
[Wu, Y.] C;College of Material Science & Engineering, Central South University of Forestry & Technology, Changsha, China
关键词：
竹纤维;碱处理;聚乳酸;可降解复合材料;相容界面
摘要：
以NaOH溶液为改性剂对竹纤维进行碱处理,再与聚乳酸(PLA)熔融共混制备竹纤维/PLA可降解复合材料。探讨了NaOH溶液浓度、碱处理时间和碱处理温度对复合材料拉伸强度、抗弯强度和耐水性能的影响规律,并采用扫描电子显微镜(SEM)对碱处理竹纤维的表面形貌进行了观测。结果表明,碱处理使竹纤维表面粗糙度增大,单纤维的强度提高,有效提高了与PLA基体的机械黏接力。但碱浓度过大、处理时间过长或处理温度过高时,纤维素分子链排列致密程度降低,整体纤维的力学性能下降。NaOH溶液浓度为3%,处理时间为4h,处理温度为60℃时,所制得竹纤维/PLA复合材料拉伸性能、弯曲性能和耐水性能均最佳。
语种：
中文
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木塑复合材料界面调控及其表征技术研究进展
作者：
杨守禄;姬宁;黄安香;李丹;吴义强
期刊：
化工新型材料 ,2018年46(11):25-30 ISSN：1006-3536
作者机构：
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;[杨守禄] 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;[姬宁; 黄安香; 李丹] 贵州省林业科学研究院, 贵阳, 550005;[吴义强] 中南林业科技大学材料科学与工程学院, 长沙, 410004
关键词：
木塑复合材料;界面调控;表征技术;天然植物纤维;塑料基体
摘要：
木塑复合材料(WPC)是一种高性能、高附加值、环境友好且应用广泛的新型材料,其天然植物纤维和塑料基体间的界面调控成为WPC研究的热点和重点。综述了WPC界面调控方法,主要包括天然植物纤维调控、塑料基体表面改性、添加改性剂等方法,同时还介绍了WPC界面表征技术,如傅里叶红外光谱分析、扫描电子显微镜分析、透射电子显微镜、X射线光电子能谱分析、动态热机械分析、纳米压痕技术和原子力显微镜分析等表征技术,指出了WPC界面调控及其界面表征技术需要解决的问题,以期提高WPC的研究和开发水平。
语种：
中文
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竹纤维/聚乳酸可降解复合材料相容界面构建进展
作者：
李文豪;吴义强;李萍;李新功;左迎峰
期刊：
材料导报 ,2018年32(17):3076-3082 ISSN：1005-023X
通讯作者：
Zuo, Yingfeng(zuoyf1986@163.com)
作者机构：
[李文豪; 吴义强; 李萍; 李新功; 左迎峰] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[李文豪; 吴义强; 李萍; 李新功; 左迎峰] 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：
竹纤维;聚乳酸;复合材料;相容界面
摘要：
竹纤维/聚乳酸可降解复合材料是一种性能优越、可完全生物降解的绿色生态环保材料。在针对亲水竹纤维与疏水聚乳酸界面不相容而导致竹纤维/聚乳酸复合材料性能劣化的问题,研究者通常采用三种策略来提高其界面相容性:竹纤维改性、聚乳酸树脂改性和增容剂改性。在现有研究基础上,未来可以通过引进纳米纤维改性粒子改善复合体系的界面相容性,完善两相界面基础理论,促进更深入的界面作用及其机理研究,以推动竹纤维/聚乳酸可降解复合材料的发展。
语种：
中文
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水灰比对镁系无机轻质材料性能的影响规律
作者：
左迎峰;肖俊华;李萍;王健;李贤军;...
期刊：
材料导报 ,2018年32(14):2370-2375 ISSN：1005-023X
通讯作者：
Wu, Yiqiang(wuyq0506@126.com)
作者机构：
[左迎峰; 肖俊华; 李萍; 王健; 李贤军; 吴义强] College of Material Science & Engineering, Central South University of Forestry & Technology, Changsha;410004, China;College of Art & Design, Xiangnan University, Chenzhou;423000, China;[左迎峰; 肖俊华; 王健; 李贤军; 吴义强] 410004, China
通讯机构：
[Wu, Y.] C;College of Material Science & Engineering, Central South University of Forestry & Technology, Changsha, China
关键词：
镁系胶凝材料;化学发泡;无机轻质材料;水灰比;孔结构
摘要：
以镁系胶凝材料为主料,双氧水为发泡剂,二氧化锰为激发剂,硬脂酸钙为稳定剂,聚丙烯酰胺为增稠剂,通过化学发泡法制备内部含有大量密闭气孔的镁系无机轻质材料。探讨了水灰比(镁盐水用量与氧化镁粉比率)对镁质无机轻质材料表观密度、压缩强度、弯曲强度、孔结构及耐水性的影响规律。实验结果表明,水灰比不仅影响镁系无机轻质材料的孔结构和发泡成型,对晶体结构也有较大影响。随着水灰比增大,浆体稠度降低,镁系无机轻质材料的表观密度减小,孔结构形态逐渐得到改善,力学强度和耐水性则是先增大后减小。在水灰比为1.4时,强度相峰值最大,镁系无机轻质材料压缩强度和弯曲强度最大,耐水性最佳,同时平均孔径较小,孔隙率和圆度值最接近开普勒理想模型数值,表观密度仅为0.41g/cm~3,适合作为节能轻质墙体材料使用。
语种：
中文
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