COMPOSITES COMMUNICATIONS
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2020
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IF 4.915
Donglei Liu,Xufeng Dong,Baoguo Han,Hao Huang,Min Qi
To meet the requirements of applications, the viscoelasticity of hydrogels is usually improved by some ways, such as incorporating nanoparticles , designing network nanostructure and regulating cross-linking density. However, it is rare to improve the viscoelasticity by designing pore microstructure for hydrogels. In this work, cellulose nanocrystal (CNC)/collagen hydrogels with different pore structures (ordered tubular pores and disordered interconnected pores) and CNC concentrations (2.5–15 wt%) were prepared. The hydrogen bonding interaction between CNCs and collagen was confirmed by FTIR. The effects of pore structure and CNC concentration on the shear viscoelasticity of hydrogels were investigated, including creep, stress relaxation, frequency and strain response. The anisotropic structure and CNCs affected the creep and stress relaxation of the hydrogels, and enhanced the stiffness and dissipated energy, which demonstrated their reinforcing effect. The anisotropic structure with horizontally tubular array not only constrained collagen network rearrangement, but enhanced the elastic properties and torsion resistance of the hydrogels under torsional oscillation compared to the disordered porous structure. The mechanism for the multi-complexation between CNCs, collagen network and pore structure was proposed to understand the relationship between component, structure and hydrogel properties.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Hanxiang Guo,Yang Peng,Yang Liu,Zhaofeng Wang,Jingwan Hu,Jinghao Liu,Qun Ding,Jiyou Gu
In this contribution, a novel cellulose acetate modified with dopamine (CA-DA) membrane material was designed and prepared by a two-step route consist of chlorination and further substitution reactions. The chemical structure of the prepared CA-DA material was determined by FTIR and 1 H NMR, respectively. The CA-DA ultrafiltration membrane was subsequently fabricated by the scalable phase inversion process. Compared with cellulose acetate membrane as the control sample, the introduction of dopamine improved the porosity, pore size and hydrophilicity of the CA-DA membrane, which was helpful to the water permeability (181.2 L/m 2 h) without obviously affecting the protein rejection (93.5%). According to the static protein adsorption and dynamic cycle ultrafiltration experiments, the CA-DA membrane displayed persistent antifouling performance, which was verified by flux recovery ratio, flux decline ratio and filtration resistance. Moreover, the water flux recovery ratio of the CA-DA membrane was retained at 97.3% after three-cycles of BSA solution filtration, which was much higher than that of the reference CA membrane. This new approach provided a long life and excellent ultrafiltration performance for polymer-based membranes, which has potential application prospects in the field of separation process.
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FOOD HYDROCOLLOIDS
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2020
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IF 7.053
Hafiz Muhammad Ahsan,Xingzhong Zhang,Yingli Liu,Yixiang Wang,Yan Li,Bin Li,Jing Wang,Shilin Liu
The objective of this work was to methylate the microcrystalline cellulose (MCC) with methylcellulose (MC), investigate the ability of modified methylated MCC (Mmcc) to stabilize the emulsions and understand their role in the preparation of solid foams and oil powders. The Mmcc was prepared by thermally cross-linking MCC, and MC at 80 °C for 4 h followed by homogenization and lypholization without any additional wall materials. The FTIR spectroscopy confirmed an increase in the intensity of –CH 2 - associated band from 1400 cm −1 to 1456 cm −1 which corresponded to MCC and methylated MCC respectively. The methylation of the MCC with MC-a, MC-b, MC-c was evidenced by an increase in the particle size from 8.381 ± 0.17 to 12.41 ± 0.16, 12.51 ± 0.03, and 15.15 ± 0.75, respectively. The Mmcc and their corresponding emulsions expressed typical shear thinning behavior. The Pickering emulsions expressed improved resistance to environmental stresses and coalescence during storage. The microstructure of the solid foams observed with scanning electron microscopy revealed porous, spherical, polyhedral, and closely packed droplets. We found that the oil powders could be rehydrated in water. Their re-dispersibility index demonstrated that the wet oil powders attained re-dispersibility. The results open up new routes to engineer long term stabilization of the Pickering emulsions, solid foams, and oil powders for different applications.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2020
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IF 4.551
Yuhang Wu,Yuanbo Xie,Fangyuan Zhong,Junkuo Gao,Juming Yao
It is of great significance to capture radioiodine from nuclear-related activities. Herein, We fabricated two kinds of hybrid aerogels composed with bimetal Hofmann-type metal-organic frameworks (Co–Fe) II (pz)[Ni II (CN) 4 ] and cellulose aerogels by in-situ growth and doping method (named CoFe@CA-IS and CoFe@CA-D, respectively). The hybrid aerogels possessed excellent iodine adsorption performance. The addition of (Co–Fe) II (pz)[Ni II (CN) 4 ] increased the porosity of the hybrid aerogels. The porosities of CoFe@CA-IS and CoFe@CA-D were reached 86.7% and 87.8%, respectively, which are higher than pure cellulose aerogels. Furthermore, the doping method provide a significant improve of adsorption performance. The equilibrium adsorption capacity of CoFe@CA-D reached 457.99 mg g −1 and the equilibrium adsorption capacity of CoFe@CA-IS was 194.34 mg g −1 . In addition, the hybrid aerogels showed excellent recycle ability, the equilibrium adsorption capacity of CoFe@CA-IS and CoFe@CA-D remained 81% and 91% after 5 cycles. The results suggested that this metal-organic framework@cellulose hybrid aerogel showed great potential in iodine treatment and could be applied in a wide field.
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CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Shicun Jin,Kuang Li,Qiang Gao,Wei Zhang,Hui Chen,Jianzhang Li
Smart conductive soft materials prepared from natural polymers are arousing ever-increasing attention in numerous advanced applications. However, achieving the synergistic properties of high biocompatibility, mechanical performance, and conductivity remains a key challenge. Herein, a novel and green strategy is proposed to fabricate a soy protein (SP)-based composite by the incorporation of hyperbranched poly(amino ester)-pyrrole (HPPy) via in situ polymerization into a bio template of cellulose nanofibril (CNF). The formed HPPy@CNF nanohybrids not only serve as dynamic cross-linking sites to construct a strong and stable network, but also impart a remarkable conductive ability to biopolymer materials. The tensile stress and toughness of the modified SP-based film increased by 362.1 % and 718.8 %, respectively superior to those of previously reported reinforcing approaches. Moreover, this biopolymer film exhibited significantly improved electrochemical properties, water resistance, and thermal stability. This synthesis strategy is facile and eco-friendly and can be easily extended to other material systems.
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Scientific Reports
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2020
·Vol. 10
·期 1
·1-10
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IF 3.998
Chen Junjun,Li Hailong,Zhang Lihui,Du Chao,Fang Tao,Hu Jian
With the rapid development of wearable and portable electronic devices, it is increasingly important to develop conductive paper-like films (CPFs) with the characteristics of light, thin and self-supporting. In this paper, nanofibrillated cellulose (NFC) was used as reinforcing phase of film-forming to combine with graphene oxide (GO). Then graphene-based CPFs were prepared by directly reducing the GO/NFC composite film without any additional adhesives, which effectively avoided the difficulties of dispersion and combination with other materials caused by direct using of high content graphene. Meanwhile, three representative reduction methods for direct reduction of GO/NFC composite films were also compared. The results show that 450 °C thermal reduction and hydroiodic acid reduction were more effective than ascorbic acid reduction. On this basis, hydroiodic acid reduction and thermal reduction were used to discuss the effect of NFC addition to the conductivity of the film. This occured when increasing the content of NFC from 10% to 50%, the electrical conductivity of the composite film by hydroiodic acid reduction decreased from 153.8 S/m to 22.2 S/m. While the conductivity of composite film increased first and then decreased after thermal reduction both at 450 °C and 550 °C. What’s more, when NFC content was about 16.6% the electrical conductivity reached a high level which was 86.21 S/m and 168.9 S/m, respectively. This study provides a groundwork for the further development of graphene-based CPFs with low square resistance and high conductivity in large-scale preparation.
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PROGRESS IN ORGANIC COATINGS
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2020
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IF 4.469
Pingbo Zhang,Yadong Lu,Mingming Fan,Pingping Jiang,Yanmin Bao,Xuewen Gao,Jialiang Xia
In this study, a graft modified Octa(aminopropyl) polyhedral oligomeric silsesquioxane (OPOSS)/ TEMPO-oxidized cellulose microfibrils (TOCMF) nanocomposite material (named PC) was prepared by a simple peptide-forming reaction to overcome the disadvantages of nanocellulose materials which have limited their application in environmentally friendly waterborne polyurethanes. The modified vegetable oil-based waterborne polyurethane (WPU) was prepared by reacting the excess amino group on the POSS with the -NCO group on the polyurethane matrix in the in-situ polymerization, in which the POSS particles function as a button-like bond between the oxidized cellulose and the polyurethane matrix. And the similar filamentous structure of TOCMF to the linear polyurethane matrix structure could greatly weaken the negative impact of the rigid structure of POSS particles on processability (Elongation at break). The performance test results showed that the mechanical properties, thermal stability and water resistance of the modified WPU composite film are greatly improved by the synergistic effect of the two nano materials. The initial decomposition temperature and water contact angle of the WPU composite film with a PC content of 0.7 wt.% were increased by 41.9 °C and 10°, respectively. Especially, the tensile strength of WPU/PC-0.7 wt.% was twice that of pure WPU.
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CELLULOSE
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2020
·Vol. 27
·期 9
·5241-5253
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IF 4.21
Yan Lingfeng,Liu Baojiang,Li Weiya,Zhao Tao,Wang Yatao,Zhao Qiangqiang
The treatment of wastewater generated by textile industry has attracted researchers' attentions, and photocatalysis is considered as a good strategy to solve this problem because of the strong redox capacity. Herein, a novel visible light-responsive cotton-PPy-MWCNTs-BiVO 4 photocatalytic material with the hierarchical structure was successfully prepared by a simple layer assembly method. The composite material has excellent degradation performance for reactive brilliant blue (RB-19) dye solution, and the degradation efficiency can reach 97.8% under visible light irradiation for 2 h. The performance improvement is mainly ascribed to the interaction between polypyrrole (PPy) and multi-walled carbon nanotubes (MWCNTs) in the system, where PPy can efficiently transfer holes and MWCNTs can separate electrons, thereby greatly speeding up the separation of photogenerated carriers. The loading of BiVO 4 , PPy and MWCNTs on cotton fabrics exhibits better stability and recyclability than traditional powdery photocatalysts. In sum, this paper provides a feasible idea for the application of flexible cellulose-based photocatalytic materials.
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MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Muhammad Rehman Asghar,Muhammad Tuoqeer Anwar,Guofeng Xia,Junliang Zhang
In this work, porous Cellulose/Poly (vinylidene fluoride hexafluoropropylene) membrane with the incorporation of different amount of titania nanoparticles is prepared by non solvent induced phase inversion (NIPS) method followed by hydrolysis with lithium hydroxide for deacetylation of cellulose acetate . The composite membranes provide interconnected porous structure with high porosity. Titania incorporation and surface modification of Poly (vinylidene fluoride hexafluoropropylene) in the membrane are investigated by Fourier-transform infrared absorbance and transmission tests. The results show that the modified membrane exhibits excellent thermal stability at 200 °C with just only 1% shrinkage and contains high ion conductivity (1.68 mS cm −1 ). Moreover for window 2.5–4.5V, the ceramic nanoparticles embedded membrane with optimal titania content enables the battery to deliver 97.34% capacity retention after running 100 cycles at 1C rate and to maintain the capacity up to 72% even for 500 cycles after continuing different cycling test with Lithium cobalt oxide/Lithium cell assembly.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Hongwei Ren,Ruiquan Gong,Meiyu Li,Yize Liu,Hongyu Zhu,Can Wang,Erhong Duan
Lignocellulosic biomass contains about 45% cellulose . The total reducing sugars (TRS) obtained from lignocellulosic materials is beneficial to the sustainable development. Natural deep eutectic solvents (NADESs) provide an attractive alternative for the “green” conversion of cellulose. In this work, series of amino acids based NADESs with FeCl 3 . 6H 2 O as ligands catalyst were synthesized and characterized by in situ IR, FT-IR, 1 H NMR and TG-DTA. NADESs showed great thermal stability. The efficient hydrolysis performance of cellulose in NADESs was investigated under mild conditions. The influencing factors such as the type of NADESs, reaction temperature, reaction time, and FeCl 3 . 6H 2 O addition on the TRS yield were studied. The optimized process conditions for hydrolyzing cellulose in L-Proline/ Ethylene glycol/FeCl 3 . 6H 2 O were molar ratio 1: 2: 1, reaction time 120 min and temperature 120 °C. The yield of total reducing sugar was 66.7%. The conversion mechanism was also investigated.
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JOURNAL OF CHROMATOGRAPHY A
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2020
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IF 4.049
Lin Li,Xiao-ting Yuan,Zhi-guo Shi,Lan-ying Xu
Chiral stationary phases (CSPs) have always been research hotspot in enantiomer separation. Currently, most of the CSPs are based on silica platform. In this research, monodisperse, porous glycidyl methacrylate-divinylbenzene copolymer particles (poly(GMA-DVB)) were designed and prepared. Then the GMA was further reacted with ethylenediamine to introduce amino groups onto the polymer, which provide anchoring sites for cellulose derivatives. Herein, Cellulose-tris (3,5-dimethylphenylcarbamate) (CDMPC) was successfully coated onto the polymer microspheres, achieving a stable and successful CSP. The porous structure and the surface moieties of the CSPs were studied in detail. The chromatographic separation was optimized. Hexaconazole,methyl DL-mandelate,benzoin and tebuconazole have been successfully separated on the CSP column, with column efficiency as high as 10,200 plates/m, which is comparable with some silica-based CSPs. The research has indicated that the poly(GMA-DVB) is a promising candidate for constructing CSPs for chiral separation.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Junfeng Cheng,Hualin Wang,Feng Xiao,Li Xia,Linlin Li,Shaotong Jiang
In this work, two combinations of double EOs, i.e., α-terpineol: eugenol (α-T:Eu) and carvacrol:eugenol (CA:Eu), are used to develop the active antibacterial films of double EOs@yam starch/microcrystalline cellulose (EOs@SC). The hydrogen-bonded networks in SC matrix are conducive to thermostability enhancement and the film of SC25 is determined for EO incorporation. The interactions between EOs and SC matrix are also hydrogen bonds and the double EOs@SC are smooth at ratio of ≤2:2 for α-T:Eu or CA:Eu. The ultimate film properties are dependent on the incorporated EOs. The release of EOs is well controlled by two mechanisms of diffusion (predominant) and swelling (secondary). Synergetic antibacterial activity occurs on double EOs@SC. The shelf life of pork can be extended by 1 day at 25 °C by the two typical films of α-T 2 :Eu 2 @SC and CA 2 :Eu 2 @SC. Moreover, EOs@SC can be well degraded in humus soil. Thereby, the target films will have great potential in active packaging to extend the shelf life of food.
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