Materials Today Sustainability
·
2022
·
IF 7.244
J. Huang,L. Hua,L. Song,J. Li,S. E,Z. Lu
With the miniaturization and densification of electronic devices, thermal management materials have attracted scientists' attention due to the devices’ high heat dissipation. In this study, hydroxyethyl cellulose (HEC) and boron nitride nanosheets (BNNS) films (HB) coated with silver nanowires (AgNWs) were prepared using ball milling and solution-casting approach to achieve one side conduction and the other side insulation and heat conduction . HB/AgNWs1.0 film with conductivity (79.1 S/m), tensile strength (36.4 MPa), and thermal conductivity (0.244 W/m/K) were employed as bending sensors. The resistance of the HB/AgNWs1.0 film becomes larger with greater curvature due to the greater distance between one-dimensional rod-like AgNWs in the conductive network. Due to the good combination performance of AgNWs and HB composite film , the sensor can work normally for 1,000 times. Meanwhile, boron nitride nanosheets in the hydroxyethyl cellulose matrix can quickly remove the heat generated by the AgNW layer, which has a good prospect in the field of electronic packaging.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Wei Guo,Hui He,Hongxiang Zhu,Xudong Hou,Xingjuan Chen,Shile Zhou,Shuangfei Wang,Lingtao Huang,Jiehan Lin
A biomass cellulose-based colorimetric sensor for Ag + and Cu 2+ was prepared by grafting 2,5-dithiourea (DTu) onto biomass-pulp cellulose. The as-prepared sensor (cellulose-DTu) showed excellent selectivity and sensitivity towards Cu 2+ over other common metal ions (Pb 2+ , Mn 2+ , Mg 2+ , Zn 2+ , Hg 2+ , K + , Al 3+ , Ca 2+ , Na + , Cd 2+ , Ni 2+ , Ba 2+ , and Li + ), exhibiting a color change from white to light grey. However, the sensor exhibited a remarkable color change from white to yellow-red upon the addition of Ag + . The naked-eye-detection concentration limits for Ag + and Cu 2+ were 10 −3 and 10 -4 mol/L, respectively. Furthermore, cellulose-DTu responded to both Ag + and Cu 2+ within 5 s. A mechanism for the selective identification of Ag + and Cu 2+ by cellulose-DTu was proposed based on 13 C solid NMR, XPS, and TEM analyses. In addition, the application of cellulose-DTu in real water confirmed that it exhibits the advantages of simplicity, rapidity, and high selectivity for in-situ identification of Ag + and Cu 2+ .
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 10
·2699-2708
·
IF 9.405
Xiaoqian Li,Xingmei Lu,Jiming Yang,Zhaoyang Ju,Ying Kang,Junli Xu,Suojiang Zhang
Aerogels derived from corn stalks are promising materials for wide use, due to their biodegradability and biocompatibility. However, preparation of cellulose-rich aerogels directly from corn stalks is a tedious and complicated process. In this study, generation of cellulose-rich aerogels was achieved by a facile approach relying on an ionic liquid and amido-sulfonic acid used as solvents. By this method, cellulose-rich aerogels were directly obtained from corn stalks through a process whereby lignin was separated from the other components of the corn stalks in one step, an approach simplifying the traditional fabrication processes. The composition, morphology and thermal stability of the obtained aerogels were investigated as they were related to the ionic liquid solvent systems used. Furthermore, the dye adsorption mechanism of cellulose-rich aerogels was simulated. In the most favourable case, the obtained aerogel was free of lignin and had the cellulose content as high as 88.1%. In addition, the aerogel possessed a porous three-dimensional structure with a high specific area (201 m2 g−1) and good thermal stability. Owing to its excellent properties, this cellulose-rich porous aerogel is expected to have a potential use in dye adsorption and other fields. This aerogel displayed an absorption capacity of 549 mg g−1 for Congo red and 302 mg g−1 for Coomassie brilliant blue.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Guihua Yan,Xiuqiang Zhang,Mengzhu Li,Xiaoyu Zhao,Xianhai Zeng,Yong Sun,Xing Tang,Tingzhou Lei,Lu Lin
The poor solubility of raw cellulose greatly limits its applications. Herein, the periodate oxidation of cellulose was conducted to obtain dialdehyde cellulose (DAC), which is a kind of soluble and configurable cellulosic derivative with great potential applications as a functional material. The oxidation of cellulose included a process of exfoliating the cellulose from its original source, and the particle size was reduced after a prolonged oxidation. The dissolved DAC, solubilized in water by heating, showed an obvious Tyndall phenomenon with a strengthening trend with aging, and the molecular weight decreased sharply at the beginning of aging and then tended to be stable after 3 months. A large change in the freeze-dried DAC solutions with different oxidation degrees, ranging from crystal string beading to hollow microspheres, was explicated by layer peeling during oxidation, while the solution was at a steady state after aging. The special structure of DAC, such as the existence of aldehydes with low molecular weight in solution-based processes and the formation of regular hollow spheres after freeze-drying, enabled it to be used in cosmetics, food, wound dressings, and drug carriers.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 37
·14883-14891
·
IF 3.069
Lijie Huang,Hao Xu,Hanyu Zhao,Mingzi Xu,Minghui Qi,Tan Yi,Shuxiang An,Xiaoxiao Zhang,Chunying Li,Chongxing Huang,Shuangfei Wang,Yang Liu
This study investigated the effectiveness of cellulose nanocrystals derived from cassava residues as a reinforcement to starch films. Thermoplastic starch films are biodegradable to a certain extent, but the scope of their applications is limited due to their strong water absorption and poor mechanical properties. Therefore, we used abandoned cassava residues to prepare cellulose nanocrystals quickly and efficiently using a mechanochemical method. Their average diameter and length were 6.281 nm and 437.232 nm, respectively, with an aspect ratio of 70; this average size is smaller than that of CNCs obtained via acid hydrolysis. Cellulose nanocrystals were ester modified using soybean oil to improve their polarity and hydrophobicity. Thermoplastic starch-based composite films were prepared using the film casting method; the mechanical and wettability properties of these films were investigated, by controlling the concentration of modified cellulose nanocrystals in the films. Scanning electron microscopy results showed that M-CNCs were evenly distributed in the composite films; thermal stability analysis showed that composite films exhibited high thermal stability; Fourier transform infrared spectroscopy results showed that the structure of cellulose nanocrystals prepared using a mechanochemical method was stable; water contact angle measurements showed promising hydrophobic effects at a contact angle of 105.7°. Moreover, mechanical tests showed that the tensile strength of the composite film increased by 73%. Therefore, soybean-oil-modified cellulose nanocrystals were excellent reinforcing agents for thermoplastic starch films, effectively improving the overall performance of the films.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 8
·4535-4542
·
IF 1.093
Zang Haoliang,Li Yanhui,Li Yali,Chen Long,Du Qiuju,Zhou Kaixuan,Li Hong,Wang Yuqi,Ci Lijie
The application of graphene oxide in water treatment is facing a rigorous challenge of how to separate nanoadsorbents from aqueous solution using conventional methods after adsorption. Herein, a new type of easily separated composite was fabricated using cellulose acetate (CA) crosslinked
with graphene oxide (CAGO) and a simple vacuum freeze-drying method. The CAGO composites were subject to SEM, FTIR, TGA, and BET characterizations. The adsorption performance of the adsorbent for the removal of methylene blue (MB) was evaluated through investigating the experimental parameters
such as initial dye concentration, temperature, adsorbent dose, contact time, and solution pH. The Langmuir and Freundlich isotherm models were applied to fit the equilibrium data. The maximum adsorption capacity of methylene blue onto the CAGO-4 composite was 374.53 mg/g at 323 K. The kinetic
data showed a good determination with pseudo-second-order equation. Thermodynamic analysis indicated that the adsorption was an endothermic and spontaneous process.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Wenjiao Ge,Shan Cao,Feng Shen,Yuyuan Wang,Junli Ren,Xiaohui Wang
Here, we designed a self-healing composite hydrogel with antioxidant and antibacterial activities by using cellulose nanofibrils (CNF) and tannic acid (TA) as functional additives. Excellent mechanical stability, moldability, stretchability and rapid self-healing ability without any external intervention were realized in one system due to the combined dynamic borate ester bonding between polyvinyl alcohol-borax (PB) and multi-hydrogen bonding between different components. The rheological measurements indicated the incorporation of CNF and TA to PB system substantially affected the viscoelasticity of hydrogels. The unique antioxidant and antibacterial properties were achieved due to the complexation of TA. These high performance multifunctional hydrogels opens a window for a broad application in the field of smart devices and surface engineering.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 40
·22966-22979
·
IF 3.049
Yue Shan,Chaoyue Li,Yongzhi Wu,Qiwen Li,Jinfeng Liao
Nature derived biopolymers such as polysaccharides and collagen have attracted considerable attention in biomedical applications. Despite excellent biocompatibility and bioactivity, their poor mechanical properties could not meet the requirement for skin regeneration. In this study, cellulose nanocrystal (CNC) was incorporated into the calcium cross-linked sodium alginate/gelatin (SA/Ge) scaffold to reinforce its physicochemical properties. A novel sodium alginate/gelatin/cellulose nanocrystal (SA/Ge/CNC) scaffold was successfully prepared through electrostatic interaction of sodium alginate and gelatin, ionic cross-linking of calcium ions with sodium alginate, and incorporation of CNC. Afterwards, the SA/Ge and SA/Ge/CNC scaffolds were fully characterized and compared with scanning electron microscopy images, swelling behaviors, tensile strengths and contact angles. The involvement of CNC produces a hybrid SA/Ge/CNC scaffold with desired porous network, moderate swelling behavior, and superior mechanical strength (from 18 MPa to 45 MPa). Furthermore, in vitro cytotoxicity and cell growth assay using mouse embryonic fibroblast cells validated that SA/Ge/CNC scaffold was non-toxic and can prompt cell adhesion and proliferation. The in vivo skin regeneration experiments using the SA/Ge/CNC scaffold group showed an improved skin wound healing process with accelerated re-epithelialization, increased collagen deposition and faster extracellular matrix remodeling. Overall, the results suggested that the SA/Ge/CNC hybrid scaffold with enhanced mechanical performance and wound healing efficacy was a promising biomaterial for skin defect regeneration.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 9
·5211-5226
·
IF 3.917
Jiang Lang,Li Ke,Yang Huiyu,Liu Xin,Xu Weilin,Deng Bo
Flower-shaped hydromagnesite (MgO-P) and magnesium oxide (MgO) micro spheres were synthesized via precipitation-aging method with and without calcination. The disassociated nano flaky petal of around 50 nm (~ 20 nm in thickness) of MgO-P and MgO by sonication were used as flame-retardants for the electrospun cellulose acetate (CA)/MgO-P or CA/MgO nanofiber. SEM, XRD, FTIR, HRTEM were used to characterize all related products. TGA was used to analyze the detailed decomposition procedures of bare, MgO-P, and MgO doped CA nanofiber. Three evaluation methods including broken time after heating, thermography during heating, and combustion observation were adopted to compare the flame-retardancy of composited nanofibers. Doped CA nanofibers showed best flame-retardancy by extending the heat-induced broken time from 0.46 to 12.09 s, which is 26.3 times that of CA nanofiber. The flame of CA/MgO-P and CA/MgO could be self-extinguished once the ignition source was removed. No smoke and size shrinkage could be observed during the combustion of CA/MgO-P or CA/MgO nanofibers. Corresponding flame-retarding mechanism of Mg-based nano flaky petal was proposed.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 37
·47941
·
IF 2.188
Hualei Xie,Yuanfeng Pan,Huining Xiao,Haiyan Liu
Conventional amphoteric and porous materials are often synthetic and polymer based; this tends to raise environmental concerns because of their poor biodegradability. To address this issue, novel natural-polymer- or amphoteric-modified cellulose and MOt (ACeOMt) composite beads with a typical mesoporous structure were developed in this study. These green-based porous beads, consisting of regenerated bagasse cellulose and oxalic acid modified montmorillonite (OMt), were successfully prepared by a facile coagulation method with fine calcium carbonate as a pore-forming agent. The beads with the best sphericity were obtained at a 1:1 weight ratio of cellulose to OMt. Scanning electron microscopy observation showed that ACeOMt possessed a smooth surface with abundant macropores. X-ray diffraction and thermogravimetric analysis characterizations demonstrated the success of the modification of montmorillonite and cellulose. The results of Brunauer–Emmett–Teller analysis indicate the presence of a typical mesoporous structure in the composite with a relatively high specific surface area. The resulting ACeOMt are expected to be biodegradable, nonhazardous, and applicable for various uses, including adsorption, chromatography, and soil remediation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47941.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Binchan Zhao,Huabin Jiang,Zongkun Lin,Shaofan Xu,Jun Xie,Aiping Zhang
Modified cellulose hydrogels were prepared by blending and cross-linking with acrylamide and acrylic acid . The structure of hydrogels was characterized and analyzed with fourier transform infrared spectroscopy (FTIR), X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Under the optimized conditions, the maximum absorption capacity in modified cellulose hydrogels of Cu (II), Pb (II) and Cd (II) ions were 157.51, 393.28 and 289.97 mg/g, respectively. In addition, the metal ion adsorption process accorded with pseudo-second-order rate equation and Langmuir adsorption isotherm. Based on the microstructure analysis and adsorption kinetics, the adsorption mechanisms such as physical, chemical, and electrostatic interactions are discussed. The adsorption process was controlled by the ion-exchange mechanism.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Yuanfeng Pan,Hualei Xie,Haiyan Liu,Pingxiong Cai,Huining Xiao
Fine aminated cellulose/montmorillonite mesoporous composite beads (ACeMt) were prepared as green-based adsorbent via a novel approach utilizing ultra-fine calcium carbonate as a pore-forming agent to increase the porosity and specific surface area of ACeMt. The resulting bioadsorbent was characterized by means of SEM, FTIR and BET analysis and used for dye removal. Adsorption experimental data were fitted with various isotherm and kinetic models. The results indicated that chemical adsorption was the rate-limiting step. The maximum adsorption capacities of ACeMt, better described by Langmuir model, were much higher than those of conventional adsorbents, particularly for the removal of Auramine O dye (up to 1336.2 mg/g at 55 °C). The adsorptions at equilibrium were better correlated with Redlich-Peterson model and uncompetitive Langmuir isotherm model in single and binary system, respectively. Overall, ACeMt is a promising bioadsorbent and highly efficient in the removal of dyes for water clarification.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）