Extreme Mechanics Letters
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2018
·
IF 0
Xin Wang,Bin Han,Run-Pei Yu,Fei-Chen Li,Zhen-Yu Zhao,Qian-Cheng Zhang,Tian Jian Lu
Fe 3 O 4 nanoparticle-infiltrated chromatography paper is prepared using a low-cost blending method. Upon characterizing the basic material properties of the Fe 3 O 4 /paper nanocomposite , beam-, accordion- and star-shaped actuators are constructed using the nanocomposite and the corresponding actuation performance is investigated experimentally. The beam-shaped actuator exhibits a reversible flexural deformation due to low magnetic hysteresis loop of the Fe 3 O 4 /paper nanocomposite, maintaining a stable response after 100 cycles. The accordion-shaped actuator can reach a maximum strain of 100% while the star-shaped actuator can capture a spitball twice heavier than itself.
研究领域:
材料科学
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智能材料
·
纳米技术
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Asia-Pacific Journal of Chemical Engineering
·
2014
·Vol. 9
·期 5
·686-695
·
IF 0.623
Peng Peng Zhang,Dong Shen Tong,Chun Xiang Lin,Hui Min Yang,Zhe Ke Zhong,Wei Hua Yu,Hao Wang,Chun Hui Zhou
The production of nanocellulose with controlled structure from plant sources with easy availability and good sustainability is very important in science and engineering. In this work, the isolation of cellulose from bamboo and the effects of the hydrolysis of different acids on the morphology, structure, and properties of the resultant cellulose and cellulose nanocrystals were investigated. Bamboo cellulose (PHC) was first isolated from raw bamboo powder by alkali and consecutive bleaching treatments. Cellulose crystallites were then prepared by the controlled hydrolysis of PHC in acid solutions. The samples were characterized by using thermogravimetric analysis, Fourier transform infrared spectroscopy, powder X-ray diffraction, laser particle size analyzer, Scanning electron microscopy, and Transmission electron microscopy. Cellulose nanocrystals prepared from the hydrolysis of the isolated bamboo cellulose in the sulfate acid, hydrochloric acid, phosphoric acid, or acetic acid solution had the length of 3–200 nm, 20–85 nm, 20–40 nm, and 6.5–20 nm, respectively. Nanocrystals made by the uses of sulfuric acid and phosphoric acid possessed higher crystallinity and lower thermal stability than those by the uses of hydrochloric acid and a mixture of acetic acid and nitric acid. Results suggested the type of acids significantly influenced the structure, morphology, and thermal stability of cellulose crystallites. The anions in the acid solution also contributed to those differences because they affected the swelling of cellulose chains and breakage of hydrogen bonds in cellulose. The findings indicate that a judicious choice of pretreatment of the cellulose and its moieties can be used for the production of different cellulose nanocrystals. © 2014 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
材料科学
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化学工程
·
植物学
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高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Yinan Zhao,Qingtao Zeng,Xuejun Lai,Hongqiang Li,Ying Zhao,Kunquan Li,Changcheng Jiang,Xingrong Zeng
Multifunctional biomass-based aerogels with mechanically robust and high fire safety are urgently needed for the development of environmentally-friendly intelligent fire fighting but challenging. Herein, a novel polymethylsilsesquioxane (PMSQ)/cellulose/MXene composite aerogel (PCM) with superior comprehensive performance was fabricated by ice-induced assembly and in-situ mineralization . It exhibited light weight (16.2 mg·cm −3 ), excellent mechanical resilience, and rapidly recovered after being subjected to the pressure of 9000 times of its own weight. Moreover, PCM demonstrated outstanding thermal insulation, hydrophobicity and sensitive piezoresistive sensing. In addition, benefiting from the synergism of PMSQ and MXene, PCM displayed good flame retardancy and improved thermostability . The limiting oxygen index of PCM was higher than 45.0 %, and it quickly self-extinguished after being removed away from fire. More importantly, the rapid electrical resistance reduction of MXene at high temperature endowed PCM with sensitive fire-warning capability (trigger time was less than 1.8 s), which provided valuable time for people to evacuate and relief. This work provides new insights for the preparation and application of the next-generation high performance biomass-based aerogels.
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PubMed
高影响因子
Advanced Composites and Hybrid Materials
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2022
·Vol. 6
·期 1
·1-10
·
IF 11.806
Ye Mengting,Wang Shengdan,Ji Xingxiang,Tian Zhongjian,Dai Lin,Si Chuanling
Superhydrophobic coatings have been widely developed to endue the materials with antibacterial, self-cleaning, antiseptic, and some other multifunctionalities. Fluorochemicals are the most commonly used superhydrophobic coatings; however, the released toxic substances from fluorinated polymers are a significant source of water pollution and even a threat to human health. With the increasingly great attention to the environment, it is imperative to exploit green and effective hydrophobic coatings. Here, a nanofibrillated cellulose-based multifunctional superhydrophobic coating (NMSC) was fabricated by using an efficient silylation process from cellulose, tetraethyl orthosilicate, and cetyl trimethoxysilane. Microscopic, chemical structural, and thermal properties analyses revealed that the NMSC has nanoroughness, low surface energy, and good thermal stability. More importantly, the NMSC displayed an unprecedented hydrophobic and self-cleaning performance (water contact angle ~ 165°). The NMSC superhydrophobic coating can realize long-term effective barriers to many fluids, including strong acid (pH 1), strong alkali (pH 13), alcohols, alkanes, esters, and some other organic solvents. Moreover, the NMSC also exhibited a certain degree of antibacterial performance. This work provides a good approach for not only the high-value application of cellulose but also the development of ecological and sustainable multifunctional coatings. Graphical Abstract
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2023
·
IF 6
Xiaoliang Zhang,Yufei Xie,Haobo Wang,Li Wang,Guangyuan Tao,Ronghan Guo,Jun Zhang,Yanli Zhao,Hongbing Ji
Porous materials have received extensive attention due to their superior adsorption properties, but there are few studies on oil adsorption. In this paper, a new self-design high-temperature reactor carried out MCC adsorption experiments, and a complete test system was used to study the adsorption characteristics, pyrolysis kinetics and pyrolysis products. The results of SEM and XRD showed that G 3 H gradually wetted the surface of MCC and the crystallinity increased. In addition, the pyrolysis parameters of MCC-adsorption-G 3 H (MAG) were measured by DSC and STA. The results showed that MCC was pyrolyzed in one step while MAG was in two. Meanwhile, thermodynamic model fitting indicated that the first stage was Fn and the second was Cnm autocatalytic. Notably, the variation of pyrolysis activation energy in the first stage was similar to that of adsorption capacity. Pyrolysis products of G 3 H were measured by Py-GC-MS, and pyrolysis residues of MAG were tested by FTIR. Combined with the volatiles determined by TG-IR, the influence of G 3 H on the pyrolysis characteristics was obtained, and the pyrolysis path of MAG was summarized. The results showed that porous materials can recycle oil and provided a guideline for industrial production.
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高影响因子
CARBOHYDRATE POLYMERS
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2022
·
IF 10.723
Wei Fan,Jiaqi Li,Lihong Wei,Yan Xu
Carboxylated cellulose nanocrystals prepared by TEMPO-mediated oxidation exhibit a distinct ability to form nematic order, however, their ability to form chiral nematic films remains relatively unexplored. In this study, bleached cotton pulp hydrolyzed with hydrochloric acid and oxidized by TEMPO-mediated oxidation produce carboxylated cellulose nanocrystals with different aspect ratios 33.1, 32.8, 30.9, 29.0 and 28.9, and surface charge densities 0.16, 0.56, 1.00, 1.25, and 1.42 e·nm −2 . By tuning the aspect ratio and surface charge density, the optimal carboxylated cellulose nanocrystals producing left-handed chiral nematic films by evaporation-induced self-assembly are obtained. The left-handed chiral nematic films enable selective reflection of left-handed circularly polarized light with the peak wavelength tunable from the visible to the near-infrared regime by modifying the characteristics of nanorods and suspensions. Such carboxylated cellulose nanocrystal films transform spontaneous luminescence to right-handed circularly polarized luminescence with the peak luminescence dissymmetry factor of −0.51.
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PubMed
高影响因子
Membranes
·
2022
·Vol. 12
·期 2
·239
·
IF 4.562
Xiaolong Sun,Longfei Yin,Huayue Zhu,Junhao Zhu,Jiahuan Hu,Xi Luo,He Huang,Yongqian Fu
In this study, chitosan and sugarcane cellulose were used as film-forming materials, while the inorganic agent zinc oxide (ZnO) and natural compound phenyllactic acid (PA) were used as the main bacteriostatic components to fabricate biodegradable antimicrobial composite membranes. The water absorption and antimicrobial properties were investigated by adjusting the concentration of PA. The scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) results demonstrated that the components of the composite membrane were successfully integrated. The addition of ZnO improved the mechanical and antimicrobial properties of the composite membrane, while the addition of PA with high crystallinity significantly reduced the water absorption and swelling. Moreover, the addition of 0.5% PA greatly improved the water absorption of the composite membrane. The results of antimicrobial experiments showed that PA improved the antimicrobial activity of the composite membrane againstStaphylococcus aureus,Escherichia coli,Aspergillus nigerandPenicillium rubens. Among them, 0.3% PA had the best antimicrobial effect againstS. aureus,E. coliandA. niger, while 0.7% PA had the best antimicrobial effect againstP. rubens.Keywords:composite membrane;phenyllactic acid;antimicrobial activity
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PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 7
·1313
·
IF 4.967
Qilin Lu,Jiayin Wu,Hanchen Wang,Biao Huang
Fluorescent cellulose nanofibers (FCNFs), with a high yield, were prepared via one-pot hydrolysis and the grafting reaction of cellulose with thiazolipyridine carboxylic acid (TPCA). The hydrolysis and Fischer esterification of cellulose were conducted under microwave-hydrothermal conditions; meanwhile, TPCA formation was induced by the dehydration reaction between L-cysteine and citric acid. The effects of the reaction temperature and reaction time on the yield and performance of FCNF were investigated. The morphology and size, surface chemical property, crystal structure, thermostability, and fluorescent performance of FCNF were characterized. The results revealed that the yield of FCNF reached 73.2% under a microwave power of 500 W, reaction temperature of 110 °C, and reaction time of 5 h. The FCNF obtained presents a short rod-like morphology. The crystallinity of the FCNFs is 80%, and their thermal stability did not decline significantly. Additionally, the fluorescent performance of the FCNFs is excellent, which results in them having good sensitivity to chloride ions. The good fluorescent performance and significant responsiveness to chloride ions of FCNFs lead to them having broad prospects in bio-labeling, biosensing, information storage, chloride ion detection, among others.Keywords:fluorescent cellulose nanofibers;high yield;one-pot;green preparation;chloride ion detection
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PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 16
·8769-8780
·
IF 6.123
Bao Chunyang,Chen Jing,Wang Yan,Yang Tao,Xu Xiaoling,Zhang Qiang
Cellulose-based matrices are expected to be ideal enzyme carriers due to their sustainability and biocompatibility. However, the linkages between immobilized enzymes and celluloses often suffer from low-density and non-biodegradability, leading to inefficient loading of enzymes as well as persistent generation of solid wastes after reuse. In the present study, cellulose-based functional materials with degradable polycarbonates brushes have been successfully synthesized as enzyme carriers via ring-opening polymerization of 5-methyl-5-allyloxycarbonyl-1,3-dioxan-2-one (MAC) following with ally epoxidation of MAC units. After covalent bonding with laccase, the resulting HPC-PMAC-Laccase could assemble in aqueous solution to form spherical nanoparticles with an enzyme immobilization efficiency of 88%. The immobilized laccase showed more tolerance towards pH and high temperature compared with free laccase. Moreover, the immobilized laccase demonstrated effective removal efficiency of bisphenol A and reached 83% in 3 h. After repeated usage for 8 times, the HPC-PMAC-Laccase still maintained relatively high enzyme activity. Especially, the polycarbonates brushes in the enzyme carriers could be totally hydrolyzed in 12 h to achieve its degradable property. Graphical abstract Cellulose-based functional polycarbonates as degradable enzyme carriers.
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高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 7
·7451-7467
·
IF 2.843
Wang Na,Wang Xinhui,Xu Baoming,Wang Yili,Lu Junliang,Chen Guorong,Zhang Heng
A surfactant with biodegradability and amphiphilicity was prepared from cellulose nanocrystals by grafting fatty acids. The structure of the modified cellulose nanocrystals was investigated by infrared spectroscopy, XRD, particle size detection and scanning electron microscopy. The changes in surface tension of the modified cellulose nanocrystals under different salt ion concentrations and pH were tested, and the molecular model of the modified cellulose nanocrystals was constructed. The optimum reaction conditions for the grafting of different fatty acid groups were determined by the degree of substitution. Infrared characterization and X-ray diffraction analysis showed that the reactants were successfully esterified and chemically modified. The particle detection shows that the average particle size of the modified cellulose nanocrystals is slightly increased, but it is still at the nanometer level and still has large specific surface area. The surface tension of the surfactant in the aqueous phase will decrease by changing the salt concentration and pH of the test environment, while the range is not large. Therefore, using trifluoroacetic anhydride as co-reactant, long-chain fatty acids can be grafted onto cellulose nanocrystals to form hydrophobic modified cellulose nanocrystals. The modified cellulose nanocrystals have little change in average particle size and have hydrophilic and lipophilic properties and are nonionic surfactants, which can be used as emulsifier for emulsion preparation. It is found that the modified cellulose nanocrystals have good salt resistance and acid and alkali resistance by testing the changes in surface tension under different environments.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Shuchun Gan,Shihang Bai,Cheng Chen,Yongliang Zou,Yingjuan Sun,Jianhao Zhao,Jianhua Rong
Ionic conductive hydrogels with both high-performance in conductivity and mechanical properties have received increasing attention due to their unique potential in artificial soft electronics. Here, a dual physically cross-linked double network (DN) hydrogel with high ionic conductivity and tensile strength was fabricated by a facile approach. Hydroxypropyl cellulose (HPC) biopolymer fibers were embedded in a poly (vinyl alcohol)‑sodium alginate (PVA/SA) hydrogel, and then the prestretched PVA-HPC/SA composite hydrogel was immersed in a CaCl 2 solution to prepare PVA-HPC T /SA-Ca DN hydrogels. The obtained composite hydrogel has an excellent tensile strength up to 1.4 MPa. Importantly, the synergistic effect of hydroxypropyl cellulose (HPC) and prestretching reduces the migration resistance of ions in the hydrogel, and the conductivity reaches 3.49 S/ m. In addition, these composite hydrogels are noncytotoxic, and they have a low friction coefficient and an excellent wear resistance. Therefore, PVA-HPC T /SA-Ca DN hydrogels have potential applications in nerve replacement materials and biosensors.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 7
·4029-4041
·
IF 4.21
Wang Xiaojun,Li Runyu,Zeng Jinsong,Cheng Zheng,Wang Bin,Ding Qijun,Gao Wenhua,Chen Kefu,Xu Jun
Abstract Plant fiber isolated cellulose nanofibers (CNFs) are the materials with excellent mechanical properties. However, application of CNFs in polymer reinforcement is normally unsatisfactory due to its intertwined size distribution. Efforts to produce uniform sized CNFs have yet to be studied. In present work, spiral microchannel was used to fractionate CNFs based on the balance between inertial lift force (F L ) and Dean drag force (F D ) exerted on CNFs. The results showed that the smaller length of CNFs equilibrated near the inner microchannel while the larger length of CNFs occupied the equilibrium position away from the inner wall. With the increase of flowrates from 50 to 220 μL/min, fractionation efficiency between inner and middle outlet (E IM ) of spiral microchannel A with larger radius curvature (R) from 5 to 15 mm increased from 0 to 75.4%. However, stronger Dean flow attributing to decrease of R (3 mm to 10 mm) of single spiral microchannel B enabled satisfactory fractionation efficiency of 70.9% at flowrate of 90 μL/min. Moreover, the fractionation efficiency of double spiral microchannel with twice as length as microchannel A and three times as length as microchannel B was lower than that of single spiral microchannel at flowrate lower than 90 μL/min. Furthermore, this study exhibited a versatile and simple method for CNFs fractionation with high fractionation efficiency. Graphic abstract
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高影响因子
危险品化学品经营许可证（带存储）