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Preparation and Applications of Soybean Residue CNF Films

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paper And Biomaterials 2019年第3期4卷 45-53页

作者： Peiyi Li Hezhen Liu Qingqing Hou Yumeng Wang Xinping Li College of Bioresources Chemical and Materials engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science and TechnologyXi’anShaanxi Province710021China state key Lab of pulp and paper engineering South China University of TechnologyGuangzhou Guangdong Province510640China key laboratory of paper Based Functional Materials of china National Light Industry Xi’an Shaanxi Province710021China Shaanxi Provincial key laboratory of papermaking technology and Specialty paper Development Xi’anShaanxi Province710021China

In this study, soybean residues were treated with HCl and soybean residue cellulose was extracted, which was used to prepare cellulose nanofiber (CNF) using the high-pressure homogenization method. The maximum yield of CNF, the reaction temperature, reaction time, and HCl concentration were optimized. The optimum HCl concentration for acid treatment was 6%, the reaction time was 60 min, the reaction temperature was 80℃, and the maximum yield of soybean residue cellulose was 78.8%. The different CNF films were then prepared;the color, mechanical property, and light transmittance of the CNF films were studied. Compared to the properties of the CNF film prepared with the soybean residue cellulose by high-pressure homogenization 15 times (HGT-15 film), the mechanical properties of the CNF film with soybean residue cellulose by decolorizing treatment decreased, but the light transmittance increased. The film prepared by adding HGT- 15 CNF to whey protein was investigated for its mechanical property, light transmittance, and solubility. Unlike the pure whey protein film, addition of 2.0% CNF to the whey protein enhanced the mechanical property and water vapor transmission rate (WVT) of the film. With the increase in CNF content, the solubility of the whey protein film decreased, and then stabilized.

关键词： acid treatment soybean residues CNF whey protein film

Effect of High Pressure Homogenization Treatment on Structure and Properties of Soybean Residue Cellulose nanofibers

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paper And Biomaterials 2019年第4期4卷 37-44页

作者： Peiyi Li Yumeng Wang Binyao Zhou Qingqing Hou Hezhen Liu Haozhe Lei Boxing Jian Xinping Li College of Bioresources Chemical and Materials engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science and TechnologyXi’anShaanxi Province710021China state key laboratory of pulp and paper engineering South China University of TechnologyGuangzhouGuangdong Province510640China Department of Chemical and paper engineering Western Michigan UniversityKalamazooMichigan49008USA key laboratory of paper Based Functional Materials of china National Light Industry Xi’anShaanxi Province710021China Shaanxi Provincial key laboratory of papermaking technology and Specialty paper Development Xi’anShaanxi Province710021China

To reduce the adverse effects of non-cellulose materials on subsequent homogenization,the effects of a high-pressure homogenization treatment on the structure and properties of cellulose nanofibers(CNF)prepared by acid treatment of soybean residue were *** effects of the number of homogenization step on the microfibrillation degree,crystalline structure and mechanical properties of the soybean residue were analyzed by SEM,FT-IR,XRD,TG and *** results showed that an increase in the number of homogenization steps led to an increase in the degree of microfibrillation,a more uniform distribution of the CNF diameter,and an increase in the crystallinity of ***,but when the number of homogenization steps exceeded 15,the rate of change decreased,and the crystallinity of CNF *** the number of homogenization steps increased,the average degree of polymerization and average molecular weight of CNF decreased continuously,and after 15 homogenization steps,their rate of change also ***,15 steps of high-pressure homogenization represented a suitable number of steps to prepare the soybean residue CNF with an average diameter of 15 nm.

关键词： soybean residue cellulose nanofibers high pressure homogenization characteristics

Melatonin retards leaf senescence by modulating phytohormone metabolism in stored Chinese flowering cabbage

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Food Quality and Safety 2023年第4期7卷 597-612页

作者：李辰翔申雪萌范中奇陈建业陶能国谭小丽 School of Chemical engineering Xiangtan UniversityXiangtanChina state key laboratory for Conservation and Utilization of Subtropical Agrobioresources Guangdong Provincial Key Laboratory of Postharvest Science of Fruits and VegetablesGuangdong Vegetables Engineering Research CenterEngineering Research Center of Southern Horticultural Products PreservationMinistry of EducationCollege of HorticultureSouth China Agricultural UniversityGuangzhouChina Institute of Postharvest technology of Agricultural Products College of Food ScienceFujian Agriculture and Forestry UniversityFuzhouChina

This paper was conducted to explore the effects of melatonin(MT)on the senescence of stored Chinese flowering cabbage and the potential modulatory mechanisms *** physiological findings demonstrated that MT successfully reduced chlorophyll loss and improved the photochemical effectiveness of cabbage *** addition,MT decreased the transcription of senescence-associated genes(BrSAG12)and genes responsible for chlorophyll *** analysis showed that MT-regulated genes were enriched in oxidative phosphorylation,hormone metabolism and signal transduction,and MT treatment reduced the high expression of genes linked to generation of reactive oxygen species(ROS),energy metabolism,phytohormone(abscisic acid(ABA),ethylene(ET),and jasmonic acid(JA))biological synthesis and signal transduction while promoting the activation of genes related to scavenging ROS,energy biosynthesis and plant–pathogen *** emphasized the examination of the potential interaction between phytohormone metabolism and *** results showed that the application of MT decreased ABA,ET,and JA levels as well as the expression of their biosynthesis genes,concurrently maintaining higher expression of cytokinin,auxin and gibberellin biosynthetic genes and lower expression of degradation *** networks of transcription factors(TFs)and genes related to ABA,ET and JA metabolism showed that TFs such as DNA-binding One Zinc Finger 5.7(DOF5.7),WRKY40,and homeobox-leucine zipper protein-16(ATHB-16)might play important transcriptional regulatory roles in mediating MT postponed leaf *** together,these findings suggested that the postponed senescence of cabbage treated with MT might be ascribed to the regulated oxidative phosphorylation,energy,phytohormone metabolism,and transcription factors.

关键词： Cabbage melatonin transcriptome leaf senescence phytohormone

A highly stretchable transparent and conductive woodfabr

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A highly stretchable transparent and conductive woodfabr

Structural Characterization of Lignins Isolated from Caragana sinica Using FT-IR and NMR Spectroscopy

中国化学会第一届全国纤维素学术研讨会

作者： Ming Wang 祁海松 state key laboratory of pulp and paper engineering South China University of Technology Guangdong engineering research center for Green Fine Chemicals

＜正＞The rational design of high—performance flexible transparent electrically conducting sensor attracts considerable ***, these designed devices predominantly utilize glass and plastic substrates, which are expensive and not environmentally friendly. Here, novel transparent and conductive woods （TCWs） were fabricated by a green and low—cost process. Deep eutectic solvents（DES）s, acrylic—acid （AA）/choline chloride （CCl）,

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光谱学与光谱分析 2011年第9期31卷 2369-2376页

作者： XIAO Ling-ping SHI Zheng-jun XU Feng SUN Run-cang Amar K Mohanty College of Material Science and technology Beijing Forestry University Beijing 100083 China state key laboratory of pulp and paper engineering South China University of Technology Guangzhou 510640 China Department of plant Agriculture Bioproducts Discovery and Development Centre (BDDC)University of Guelph Guelph Ontario N1G 2Wl Canada

In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline *** lignin structures were characterized by Fourier transform infrared spectroscopy(FT-IR) and 1D and 2D Nuclear Magnetic Resonance(NMR).FT-IR spectra revealed that the "core" of the lignin structure did not significantly change during the treatment under the conditions *** results of 1H and 13C NMR demonstrated that the lignin fraction L2,isolated with 70% ethanol containing 1% NaOH,was mainly composed of β-O-4 ether bonds together with G and S units and trace p-hydroxyphenyl *** on the 2D HSQC NMR spectrum,the ethanol organosolv lignin fraction L1,extracted with 70% ethanol,presents a predominance of β-O-4′ aryl ether linkages(61% of total side chains),and a low abundance of condensed carbon-carbon linked structures(such as ββ′,β-1′,and β-5′) and a lower S/G ***,a small percentage(ca.9%) of the linkage side chain was found to be acylated at the γ-carbon.

关键词： Caragana sinica Lignin Structural characterization FT-IR NMR

A Janus heteroatom-doped carbon electrocatalyst for hydrazine oxidation

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National Science Review 2023年第3期10卷 152-162页

作者： Jieting Ding Hao-Fan Wang Xianfeng Yang Wenbo Ju Kui Shen Liyu Chen Yingwei Li School of Chemistry and Chemical engineering South China University of Technology Analytical and Testing Centre South China University of Technology School of Physics and Optoelectronics South China University of Technology

The trade-off between the intrinsic activity and electronic conductivity of carbon materials is a major barrier for *** report a Janus-type carbon material combining electrically conductive nitrogen-doped carbon(NC) and catalytically active boron,nitrogen co-doped carbon(BNC).The integration of NC with BNC can not only ensure high electronic conductivity of the hybrid,but also achieve an enhancement in the intrinsic activity of the BNC side due to the electron redistribution on their coupling *** the electro catalytic hydrazine oxidation reaction(HzOR),the Janus carbon electrocatalyst exhibits superior activity than their single counterparts and simple physical mixtures.D ensity functional theory calculations reve al that the NC/BNC interfaces simultaneously promote efficient electron transport and decrease the free energy of the rate-determining step in the HzOR process.

关键词： electronic conductivity heteroatom-doped carbon hydrazine oxidation reaction intrinsic activity metal–organic frameworks

Spectroscopic investigation of defects mediated oxidization of single-layer MoS_(2)

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Science china(Technological Sciences) 2021年第3期64卷 611-619页

作者： HE ZuYun GUO Zheng ZHONG Xiao CHEN XiaoFei XUE JianMing WANG XinWei CHEN Yan School of Environment and Energy South China University of TechnologyGuangzhou 510006China School of Advanced Materials Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China state key laboratory of Nuclear Physics and technology School of PhysicsPeking UniversityBeijing 100871China

Due to the extremely large surface to bulk ratio,the properties of single layer(SL)MoS_(2)are largely determined by its interaction with *** critical interaction process that has been intensively investigated is the oxidation process of MoS_(2).Despite numerous previous explorations,the detailed mechanism regarding how MoS_(2)reacts with oxygen is still not well *** this work,we systematically investigate the impact of intrinsic and pre-created defects on the oxidation process of SL MoS_(2).For pristine SL MoS_(2),the oxidation is found to initiate near point defects and grain boundaries,leading to the formation of triangle pits in the basal plane and cracks near the grain *** pre-created defects introduced by ion irradiation are found to serve as the oxidation center,resulting in a more uniform oxidation *** oxidation is found to introduce p-type doping in the SL MoS_(2),leading to the blue shift of Raman and photoluminescence(PL)*** shift is found to be more for the region near the grain boundary and for the samples with more pre-created *** results suggest that the presence of defects can strongly promote the oxidation reaction of SL MoS_(2)in ambient condition,which significantly affects the stability and functionality of materials.

关键词： single layer MoS_(2) oxidation defect

Green Modification of Cellulose nanocrystals and Their Reinforcement in nanocomposites of Polylactic Acid

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paper And Biomaterials 2018年第4期3卷 10-18页

作者： Xue Jiang Martin A.Hubbe Jiangsu engineering and technology research center for Functional Textiles Jiangnan University key laboratory of Eco-textiles of Ministry of Education School of Textile and Clothing Jiangnan University state key laboratory of pulp and paper engineering South China University of Technology Department of Forest Biomaterials College of Natural Resources North Carolina State University

Cellulose nanocrystals （CNCs） of rod-like shape were prepared from degreased cotton using sulfuric acid hydrolysis. The obtained CNC suspension was neutralized using a sodium hydroxide solution to remove the residual sulfuric acid and improve the thermal stability of the CNC particles. Then, poly（ethylene oxide）（PEO） was employed to modify the nanocrystals through entanglement and physical adsorption. The goal was to further improve the thermal stability and weaken the hydrophilicity of CNCs. Original and modifed CNCs were dosed into a polylactic acid （PLA） matrix to prepare nanocomposites using a hot compression process. Results of the thermogravimetric analysis showed that the initial thermal decomposition temperature of the modifed CNCs showed a 120℃ improvement compared to the original CNCs. That is, the thermal stability of the modified CNCs improved because of their shielding and wrapping by a PEO layer on their surface. Results from scanning electron microscopy and ultraviolet-visible spectrophotometry showed that the compatibility of the modifed CNCs with organic PLA improved, which was attributed to the compatibility of the PEO chains adsorbed on the surface of the CNCs. Finally, the results of tensile tests indicated a significant improvement in terms of breaking strength and elongation at the break point.

关键词： cellulose nanocrystals thermal stability hydrophilicity polylactic acid compatibility nanocomposites

Performance Assessment of nanocellulose Hydroxypropyl Methyl Cellulose Composite on Role of nano-CaCO_(3) for the Preservation of paper Documents

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paper And Biomaterials 2022年第2期7卷 1-9页

作者： Xiaochun Ma Altaf Halim Xiaohong Li Huiming Fan Shiyu Fu state key laboratory of pulp and paper engineering South China University of TechnologyGuangzhouGuangdong Province510640China Lingnan Literature Protection research center GuangzhouGuangdong Province510640China National research center of Egypt Giza12622Egypt Guangzhou paper Co. Ltd.GuangzhouGuangdong Province510280China

Deacidification and self-cleaning are important for the preservation of paper *** this study,nano-CaCO_(3) was used as a deacidification agent and stabilized by nanocellulose(CNC)and hydroxypropyl methylcellulose(HPMC)to form a uniform *** by polydimethylsiloxane(PDMS)treatment and chemical vapor deposition(CVD)of methyltrimethoxysilane(MTMS),a hydrophobic coating was constructed for self-cleaning *** pH value of the treated paper was approximately 8.20,and the static contact angle was as high as 152.29°.Compared to the untreated paper,the tensile strength of the treated paper increased by 12.6%.This treatment method endows the paper with a good deacidification effect and self-cleaning property,which are beneficial for its long-term preservation.

关键词： paper documents nanocellulose self-cleaning nano-CaCO_(3) superhydrophobicity deacidification