JOURNAL OF MATERIALS SCIENCE
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2017
·Vol. 52
·期 14
·8472-8484
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IF 2.599
Xu Mengya,Wang He,Wang Gang,Zhang Lin,Liu Gang,Zeng Zhixiang,Ren Tianhui,Zhao Wenjie,Wu Xuedong,Xue Qunji
Semiconductor photocatalysts play a major role in photocatalytic process. Zinc oxide (ZnO) is supposed to be a preferred photocatalyst due to its high photosensitivity, mechanical–thermal stability, tunable morphology and non-toxicity. To enhance the photocatalytic activity of ZnO, cellulose/ZnO composite films (CZ films) with snowflake-like ZnO micro/nanoparticles immobilized in cellulose matrix were prepared by a simple dissolution and regeneration of cellulose and subsequently one-step hydrothermal synthesis of ZnO. The immobilization of ZnO was conducive to overcoming the shortcomings of aggregation easily and reclamation difficulty of scattered nanopowders. The obtained CZ films exhibited excellent photocatalytic efficiency (85.3%) to degrade methylene blue with minor amount of ZnO photocatalyst (<6 mg). The experimental results show that a photocatalytic process involving absorption–degradation–desorption was proposed. Notably, the synergistic effects between cellulose film and the supported ZnO via absorption and desorption processes were important to enhance the photocatalytic efficiency. This work provided an effective method to support ZnO photocatalyst and improve the photocatalytic efficiency via a functional substrate.
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Journal of Materials Chemistry B
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2017
·Vol. 5
·期 38
·7876-7884
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IF 4.543
Kaiwen Mou,Juanjuan Li,Yunyun Wang,Ruitao Cha,Xingyu Jiang
Nanocellulose materials have undergone rapid development in recent years as promising biomedical materials due to their excellent physical and biological properties, in particular their biocompatibility, biodegradability, and low cytotoxicity. In this study, we prepared 2,3-dialdehyde nanofibrillated cellulose (DANFC) by sodium periodate oxidation, which is a mild oxidation process. With increasing oxidation time, the antimicrobial activity of DANFC against both Staphylococcus aureus (S. aureus) and methicillin-resistant Staphylococcus aureus (MRSA) improved. DANFC also displays good biocompatibility with mammalian cells, and shows good blood compatibility. In addition, animal studies and histology results reveal that DANFC can accelerate wound healing and enhance the formation of blood vessels and epithelium.
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ACS Sustainable Chemistry & Engineering
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2016
·
IF 5.267
Xujuan Huang,Aiting Wang,Xu Xu,He Liu,Shibin Shang
We report on an efficient method for the formation of modified cellulose-based materials with enhanced hydrophobic properties, formed by grafting with polymeric epoxidized soybean oil (ESO) as a renewable, environmentally friendly, and low cost raw material. The grafting process occurred via ring-opening polymerization, wherein the cellulose hydroxyl groups acted as initiators in the presence of a SnCl4 catalyst, linking the cellulose fibers and ESO via ether linkages, thereby forming a polymeric matrix. The surface polarity was therefore decreased by the substitution of cellulose hydroxyl groups for long-chain hydrophobic alkane moieties from ESO. The water contact angle of modified filter paper reached 145.1° with the surface free energy decreasing to 22.07 mJ m–2 and a hydration free energy of −13.09 mJ m–2. The presence of polymeric ESO nanoparticles on the modified cellulose fibers suggested that the hydrophobicity was not only dependent on the surface composition but was also closely related to the surface morphology. To reveal the effects of surface morphology on hydrophobicity, smooth cellulose films anchored to mica plates via PVAm with a surface roughness of 1.698 nm were prepared by spin coating and modified with ESO. The thus-formed modified cellulose films also contained polymeric ESO nanoparticles which increased their roughness and enhanced their hydrophobic properties.
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Nanoscale
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2016
·Vol. 8
·期 9
·5089-5097
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IF 7.76
Abdul Hakeem,Fouzia Zahid,Ruixue Duan,Muhammad Asif,Tianchi Zhang,Zhenyu Zhang,Yong Cheng,Xiaoding Lou,Fan Xia
Herein, we design novel cellulose conjugated mesoporous silica nanoparticle (CLS-MSP) based nanotherapeutics for stimuli responsive intracellular doxorubicin (DOX) delivery. DOX molecules are entrapped in pores of the fabricated mesoporous silica nanoparticles (MSPs) while cellulose is used as an encapsulating material through esterification on the outlet of the pores of the MSPs to avoid premature DOX release under physiological conditions. In in vitro studies, stimuli responsive DOX release is successfully achieved from DOX loaded cellulose conjugated mesoporous silica nanoparticles (DOX/CLS-MSPs) by pH and cellulase triggers. Intracellular accumulation of DOX/CLS-MSPs in human liver cancer cells (HepG2 cells) is investigated through confocal microscope magnification. Cell viability of HepG2 cells is determined as the percentage of the cells incubated with DOX/CLS-MSPs compared with that of non-incubated cells through an MTT assay.
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Scientific Reports
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2017
·Vol. 7
·期 1
·1-8
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IF 4.259
Zhang Hui,Li Yuqi,Lu Zexiang,Chen Lihui,Huang Liulian,Fan Mizi
Oil-water separation has recently become a worldwide concern because of the increasing oil spill accidents and industrial oily wastewater generation. Herein, a facile method with the combined superhydrophobic coating and adhesive was used to fabricate superhydrophobic TiO 2 NPs coated cellulose sponge. The developed materials exhibited excellent superhydrophobicity (WCA = 171°) and superoleophilicity (OCA = 0°), which can separate a variety of oil-water mixtures, including chloroform, toluene, kerosene and other contaminations. A high separation efficiency up to 98.5% for chloroform-water mixture was achieved when used for gravity-driven oil/water separation test. More importantly, the as-prepared samples exhibited excellent chemical stability and mechanical abrasion resistance even towards various corrosive oil/water mixtures (such as strong acid, alkali solution and salt-water environment) or a strong abrasion by aluminium oxide sandpaper of 600 mesh. In addition, the separation efficiency remained above 93% even after 40 scratch cycles, and the materials could be reused with a stable hydrophobicity, indicating a strong potential for industrial application.
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CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Mei Li,Jianling Xia,Chengxiang Ding,Wei Mao,Haiyang Ding,Lina Xu,Shouhai Li
Ethyl cellulose (EC) membranes can be combined with efficient plasticizers derived from renewable resources to form supramolecular systems. In this paper, a novel ricinoleic acid-based sulfhydryl triol (STRA) was first synthesized and used as a plasticizer for EC membranes. A supramolecular membrane of EC and STRA using van der Waals forces was designed. The morphology, hydrophilic performance, thermal stability, and mechanical properties of the composites were investigated. While pure EC is brittle, its membrane ductility and hydrophilic performance can be improved by integration with STRA. The highest tensile strength was found in EC/STRA (90/10) (8.37 MPa). Impressively, the EC/STRA(60/40) and EC/STRA(50/50) elongation at break values were 17.4 and 20.2 times higher, respectively, than that of pure EC. This novel ricinoleic acid-based sulfhydryl triol can be used as a feedstock for hydrophobic EC membranes.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2017
·
IF 3.671
Wenhang Wang,Xiaowei Zhang,Anguo Teng,Anjun Liu
Given a variety of distinguished aspect ratio-related characteristics of nanofiber cellulose (NFC), the impact of NFC on gelatin hydrogel performance involving strength, rheology, microstructure was investigated, focusing on concentration percolation mechanism for it. The inner topography displayed a compact three-dimensional network structure in the NFC-added gelatin gel, however, an NFC amount of 7.5 g kg −1 caused more inhomogeneous aggregation. Texture profile analysis showed that the addition of NFC increased the hardness but reduced the elasticity of gelatin gel at 10 °C, depending on NFC concentration. For static rheology, adding NFC transformed gelatin solution from the Newtonian action into pseudoplastic behavior at 60 °C, with a marked increase of viscosity. Furthermore, NFC improved the temperature of sol-gel transition of gelatin, even no obvious transformation as ≥5 g kg −1 NFC used. NFC reinforcement provides the potential to use as texture modifier along with gelatin in food field.
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CARBOHYDRATE POLYMERS
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2016
·
IF 4.219
Yang Yang,Yanzhu Guo,Runcang Sun,Xiaohui Wang
A series of linoleic acid conjugated hydroxyethyl cellulose polymers (HEC- g -LA) were synthesized and characterized. And their solubilities in a variety of solvents were compared. The prepared HEC- g -LA polymers showed typical properties of amphiphilic polymers and were able to self-assemble into spherical nanomicelles in aqueous solution. The micelle sizes and critical micelle concentrations (CMC) were found correlated with the molecular structure of polymers, and were varied in the range of 20–50 nm and 1.92–21.76 μg/ml, respectively. Furthermore, the hydrophobic active component β-carotene (β-C) was successfully encapsulated into the HEC- g -LA micelles by sonication-dialysis method. The β-C encapsulation efficiency and loading content were found to be as high as 84.67% (w/w) and 4.23%. The results of in vitro release showed that the encapsulated β-C was continuously released from the micelles in phosphate buffered saline (PBS) medium for about 7 days. The self-assembled HEC- g -LA nanomicelles are potential nanocarriers of hydrophobic active compounds for functional food applications.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2016
·Vol. 49
·期 28
·285105
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IF 2.772
Jiaqi Pan,Jing Li,Xiufang Zhang,Yingying Zheng,Can Cui,Zhiyan Zhu,Chaorong Li
Cotton cellulose nanofibers (CCNFs)/In2S3/Ag–CdS nanocomposites were prepared by a typical technical route which combined electrospinning and a chemical method. The results showed that the CCNFs/In2S3/Ag–CdS nanocomposites had a remarkable visible light photocatalytic property and cycling stability, which displayed a significant enhancement compared with that of pure In2S3. Through analysis, this enhancement could be mainly attributed to the multilevel structure of the composites.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2016
·
IF 3.138
Shumin Liu,Wenchao Luo,Huihua Huang
Carboxymethyl cellulose was derived from bamboo shoot cellulose via chemical modification and was prepared into composite hydrogels by cross-linkage with β-cyclodextrin using epichlorohydrin as crossing agent. The structure of the prepared hydrogel was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. The results showed that the prepared composite hydrogel was sensitive to surrounding changes in pH value, temperature and ionic strength. Under the surroundings of low temperatures and high pH values, the prepared hydrogel had significant high swelling ratios (23338 ± 988% at 15 °C and 6937 ± 112% at pH 8.0, respectively). In the solution of 0.1 mol/L NaCl, the hydrogel showed the maximum water retention rate (48.73%). Sodium salicylate was used as the model drug to study the behaviors of hydrogel adsorption and release in simulated intestinal (at pH 7.4) and gastric liquid (at pH 1.8) surroundings. The prepared composite hydrogel exhibited higher drug release ratio in simulated intestinal liquid (63.09% after 380 min) than in gastric liquid (22.09% after 400 min). These pH responses of the prepared composite hydrogel showed its potential applications, especially as the drug carrier to attain control release of drugs under different surrounding conditions or organs in human body.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2016
·
IF 3.652
Zhen-Yi Du,Xia Wang,Zhi-Hua Zhang,Jie Feng,Yu-Hong Qin,Bin-Bin Zhang,Wen-Ying Li
The reforming characteristics of biomass volatiles on anthracite chars were investigated by comparing the structural evolution of tars derived from cellulose and lignin as the major biomass components. In a two-stage quartz reactor, the pyrolysis volatiles of cellulose and lignin were produced in the first stage and then reformed in the second stage with or without the presence of anthracite chars between 600 and 900 °C. The results show that the presence of anthracite chars enhanced the destruction of volatiles of both feedstocks. Furthermore, the tar yields of lignin showed a slower decreasing trend with temperature than those of cellulose, suggesting that the lignin volatiles were more refractory to be reformed. The lignin tars had higher molecular weights and contained higher percentage of compounds with large aromatic ring systems (≥3 fused benzene rings) than cellulose tars in the studied temperature range. Compositional analysis revealed that tars of both feedstocks experienced the transition from phenolic compounds to polycyclic aromatic hydrocarbons with increasing temperature. The surface areas of anthracite chars were reduced because of coke deposition after interacting with the volatiles of both feedstocks below 800 °C, above which the net gasification of chars took place.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
·
IF 2.76
Guohui Li,Kaiyue Sun,Dawei Li,Pengfei Lv,Qingqing Wang,Fenglin Huang,Qufu Wei
Bacterial cellulose-gold nanoparticles (BC-AuNPs) hybrid nanofibers were synthesized by in-situ chemical reduction. The obtained BC-AuNPs nanofibers were characterized by a series of analytical techniques. The results revealed that gold nanoparticles (AuNPs) were successfully deposited on the surfaces of bacterial cellulose nanofibers. Then, the as-prepared BC-AuNPs hybrid nanofibers were attached onto the electrode surface followed by adding a certain amount of laccase (Lac) and Nafion to construct novel a biosensing platform. The prepared electrochemical biosensor was employed to detect hydroquinone. The sensor showed excellent electrocatalysis towards dopamine with low detection limit (5.71 nM), and wide linear range (30–100 nM). Moreover, the biosensor also showed good repeatability, reproducibility, selectivity and stability and was successfully used in the detection of hydroquinone in lake water samples, thus providing a promising method for hydroquinone detection in water environments.
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