ANALYTICAL CHEMISTRY
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2020
·
IF 6.785
Ruihua Tang,Lina Liu,Min Li,Xue Yao,Yaowei Yang,Sufeng Zhang,Fei Li
Multilayered and stacked cellulose paper has emerged as a promising platform for construction of three-dimensional (3D) cell culture because of its low cost, good biocompatibility, and high porosity. However, its poor light transmission makes it challenging to directly and clearly monitor cell behaviors (e.g., growth and proliferation) on the paper-based platform using an optical microscope. In this work, we developed a transparent microcrystalline cellulose/polyvinyl alcohol (MCC/PVA) paper with irregular pores through dissolution and regeneration of microcrystalline nanocellulose, addition of a porogen reagent (NaCl), and subsequently dipping in PVA solutions. The transparent MCC paper displays high porosity (up to 90%), adjustable pore size (between 23 and 46 μm), large thickness (from 315 to 436 μm), and high light transmission under water (>95%). Through further modification of the transparent MCC paper with PVA, the obtained transparent MCC/PVA paper shows enhanced mechanical properties (dry and wet strengths), good hydrophilicity (with a contact angle of 70.8°), and improved biocompatibility (cell viability up to 90%). By stacking and destacking multiple layers of the transparent MCC/PVA paper, it has been used for both two-dimensional and three-dimensional cell culture platforms. The transparent MCC/PVA paper under water enables both direct observation of cell morphology by an optical microscope via naked eyes and fluorescence microscope after staining. We envision that the developed transparent MCC/PVA paper holds great potential for future applications in various bioanalytical and biomedical fields, such as drug screening, tissue engineering, and organ-on-chips.
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高影响因子
Polymers
·
2020
·Vol. 12
·期 10
·2219
·
IF 3.426
Mengke Zhao,Sufeng Zhang,Guigan Fang,Chen Huang,Ting Wu
A novel three-dimensional carboxymethyl cellulose (CMC)/reduced graphene oxide (rGO) composite aerogel crosslinked by poly (methyl vinyl ether-co-maleic acid)/poly (ethylene glycol) system via a directional freezing technique exhibits high structure stability while simultaneously maintaining its excellent adsorption capacity to remove organic dyes from liquid. A series of crosslinked aerogels with different amounts of GO were investigated for their adsorption capacity of methylene blue (MB), which were found to be superb adsorbents, and the maximum adsorption capacity reached 520.67 mg/g with the incorporation of rGO. The adsorption kinetics and isotherm studies revealed that the adsorption process followed the pseudo-second-order model and the Langmuir adsorption model, and the adsorption was a spontaneous process. Furthermore, the crosslinked aerogel can be easily recycled after washing with dilute HCl solution, which could retain over 97% of the adsorption capacity after recycling five times. These excellent properties endow the crosslinked CMC/rGO aerogel’s potential in wastewater treatment and environment protection.Keywords:carboxymethyl cellulose;reduced graphene oxide;directional freezing technique;adsorption;wastewater treatment
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高影响因子
CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Lu Shen,Haoruo Zhang,Yanzhou Lei,Yang Chen,Mei Liang,Huawei Zou
For the preparation of high-performance sound absorption materials, the fabrication of hierarchical pore structure has proven to be an effective way. Herein, cellulose nanofiber (CNF) and melamine foam (MF) were combined by an environmentally friendly method for the first time, which endowed the final composite foam with both macropores and mesopores. The hierarchical pore structure was constructed by cyclic freezing-thawing, which enhanced the multiple reflections and micro-vibration of the sound waves, resulting in an obvious improvement in sound absorption performance. Specifically, compared with the unmodified MF, the sound absorption performance of composite foam with a thickness of 20 mm at 0.4 wt% CNF concentration showed an enhancement of about 107 % at 500 Hz and the NRC (noise reduction coefficient) had an improvement of 80 %. This work is expected to provide more inspiration for the design and preparation of high-performance sound absorption materials.
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高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Qun Liu,Haihuan Yu,Fanming Zeng,Xiao Li,Jing Sun,Chun Li,Hai Lin,Zhongmin Su
A novel composite HKUST-1/cellulose/chitosan aerogel (HKUST-1/CCSA) as an efficient adsorbent with hierarchical pores was prepared through a facile in situ growth way combining covalent cross-linking, vacuum freeze-drying, and solvothermal methods. By incorporating with cellulose (CE), covalently cross-linked cellulose (CE)/chitosan (CS) composite aerogel exhibits good stability, maintaining fine morphology and structures in acidic solutions under solvothermal conditions. Meantime, a high content of CS is beneficial to enhancing the growth of HKUST-1. Finally, the mass loading ratio of HKUST-1 is as high as 42.54 % in HKUST-1/CCSA. The BET specific surface area of HKUST-1/CCSA reaches 457.75 m 2 g −1 , which is much larger than that of CCSA (9.74 m 2 g −1 ). HKUST-1/CCSA was applied to remove methylene blue with high adsorption capacity (526.3 mg g −1 ) and good recycling capability. This strategy can provide an effective and facile pathway to prepare ultra-stable polysaccharide-based composite aerogel with high specific surface area and hierarchical pores, branching out more applications in pollutant treatment fields.
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高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Lei Zhang,Feng Wei,Qianqian Bai,Danhong Song,Zhuofan Zheng,Yafei Wang,Xin Liu,AL-Ammari Abdulrahman,Yingxin Bian,Xuran Xu,Chuntao Chen,Hongsong Zhang,Dongping Sun
Despite the widely explored biomaterial scaffolds in vascular tissue engineering applications lately, no ideal platform has been provided for small diameter synthetic vascular grafts mainly due to the thrombosis issue. Endothelium is the only known completely non-thrombogenic material; so, functional endothelialization onto vascular biomaterials is critical in maintaining the patency of vascular networks. Bacterial cellulose (BC) is a natural biomaterial with superior biocompatibility and appropriate hydrophilicity as potential vascular grafts. In previous studies, surface modification of active peptides such as Arg-Gly-Asp (RGD) sequences onto biomaterials has been proven to achieve accelerated and selective endothelial cell (EC) adhesion. In our study, we demonstrated a new strategy to remotely regulate the adhesion of endothelial cells based on an oscillating magnetic field and achieve successful endothelialization on the modified BC membranes. In details, we synthesized bacterial cellulose (BC), magnetic BC (MBC), and RGD peptide-grafted magnetic BC (RMBC), modified with the HOOC-PEG-COOH-coated iron oxide nanoparticles (PEG-IONs). The endothelial cells were cultured on the three materials under different frequencies of an oscillating magnetic field, including “stationary” (0 Hz), “slow” (0.1 Hz), and “fast” (2 Hz) groups. Compared to BC and MBC membranes, the cells on RMBC membranes generally show better adhesion and proliferation. Meanwhile, the “slow” frequency of a magnetic field promotes this phenomenon on RMBC and achieves endothelialization after culture for 4 days, whereas “fast” inhibits the cellular attachment. Overall, we demonstrate a non-invasive and convenient method to regulate the endothelialization process, with promising applications in vascular tissue engineering.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 17
·10241-10257
·
IF 4.21
Cai Chenyang,Wei Zechang,Huang Yangze,Wang Pei,Song Jianyue,Deng Leixin,Fu Yu
Abstract Assembling 1D cellulose nanocrystal into robust functional 3D macro-materials can be conducive to the broad application of nanocomposites, but it remains a huge challenge. Inspired by mussel-like adhesion and nacre structures, functionalized sodium alginate was in-situ synthesized with dopamine as a reinforcement agent and an interface jointer for the cellulose nanocrystal (CNC) nanocomposites with excellent mechanical properties. A rhodamine derivative was developed as a structural modifier to extend bulk strength as well as generate outstanding fluorescence. Through facile vacuum-assisted assembly, the resulting nanocomposites showed 210% and 220% increase in strength and Young’s modulus respectively, without losing ductility. Such experiment results were much higher than those of the reported. The thermal stability and water resistance were also improved remarkably, with favorable fluorescent and photothermal conversion functionalities. This study explored a promising approach to prepare biomimetic CNC nanocomposites with favorable properties and extra functionality, showing great potentials for various applications in fluorescent probe field. Graphic abstract
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高影响因子
Coatings
·
2020
·Vol. 10
·期 10
·969
·
IF 2.436
Xue Dong,Tieling Xing,Guoqiang Chen
Pilling is a common and unresolved problem in knitted fabrics, especially for the cellulose fiber blended fabrics, which not only causes an unattractive appearance and an uncomfortable handle, but also reduces the added value of the products. In this study, four different kinds of knitted fabrics were treated with 2,4,6-trichloropyrimidine (TLP) alkaline emulsion by dipping and pad–dry–cure modification processes. The surface morphology and chemical structure of original and treated fabrics were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The anti-pilling performance, thermal properties, physical and mechanical properties and color features of treated fabrics were also evaluated. The results indicated that TLP was successfully covalently crosslinked onto the surface of the cellulose fibers. The dipping process resulted in a better anti-pilling property than that of the pad–dry–cure process, and both treatments could bring about an excellent anti-pilling property and outstanding laundering durability. A pilling grade of 4.5 was achieved for the treated polyester/viscose (T/V) fabric with the dipping process even after 20 washing cycles. In addition, the treated fabrics displayed an enhanced antistatic property and still maintained a soft handle. Besides, the bursting strength and air permeability of treated samples were found to have a slight deterioration, while no apparent differences were found in the color parameters and colorfastness of dyed fabrics. The above results demonstrate that 2,4,6-trichloropyrimidine has the potential application prospect in the functional finishing and home-caring of textiles.Keywords:2,4,6-trichloropyrimidine;anti-pilling;cellulose fiber blended fabrics;dipping process;pad–dry–cure process
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高影响因子
CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Somia Yassin Hussain Abdalkarim,Zhaofeng Ouyang,Hou-Yong Yu,Yingzhan Li,Chuang Wang,Rabie A.M. Asad,Yujun Lu,Juming Yao
The intrinsic intermittence of solar energy raises the necessity for thermal energy storage (TES) systems to balance the contradiction between energy supply and demand energy. This work experimentally provides solid-liquid phase change materials (PCMs) with sufficient storage capacity and discharging rate to offer heating for agriculture products by enhancing heat transfer in phase change fiber composites (PCF). To achieve this, we prepared dipole responsive magnetic/solar-driven PCF composites reinforced with magnetic cellulose nanocrystals hybrids ( M CNC). The obtained PCF/ M CNC-5% showed excellent magnetic property with a saturation magnetization (MS) value of 1.3 emu/g and effective latent heat phase change enthalpies of 69.2 ± 3.5 J/g – 83.1 ± 4.2 J/g. More importantly, PCF/ M CNC-5% showed robust high magnetic to thermal energy storage efficiency of 32.5 % and solar light accelerated energy storage efficiency of 58.5 %. These advantages make the PCF composites promising and more desirable for drying and preservation of the fruits and other agriculture products.
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Hong Gao,Lu-Lu Fu,Ming-Lan Cai,Wei Chen,Zheng-Wu Bai
In order to find a facile and practical method to synthesize amino cellulose in bulk with high regional selectivity and high degree of substitution, the reaction conditions to brominate cellulose and to reduce azido group were carefully studied and some interesting phenomena were observed. With the optimized method, 6-amino-6-deoxy cellulose could be easily prepared with very simple separation techniques. The degree of substitution of the amino group amounted to 0.97 which was determined by 1 H NMR spectrum of 6-benzamido-6-deoxy cellulose. Moreover, the amino group was evidenced to be at the C 6 of glucose unit by 1 H- 1 H COSY NMR and 1 H- 13 C HSQC NMR spectra. In addition, three cellulose 6-acetamido-6-deoxy-2,3-bis(phenylcarbamate)s were prepared from the 6-amino-6-deoxy cellulose prepared with the techniques optimized in the present study. The developed cellulose derivatives were used as chiral selectors with which chiral stationary phases (CSPs) were prepared. The CSPs exhibited enantioseparation power to some chiral compounds.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1541-1553
·
IF 5.044
Yin Yanan,He Jiacheng,Zhang Chenggang,Chen Jisi,Wu Jinxing,Shi Zhuqun,Xiong Chuanxi,Yang Quanling
Abstract Flexible dielectric materials with high energy density and remarkable charge–discharge efficiency are currently in great demand for the field of energy storage. On the other hand, it is also urgent to develop renewable, biodegradable and environmentally friendly dielectric materials. In this work, Al 2 O 3 nanoparticles (AO) with a diameter of ~ 10 nm were incorporated into regenerated cellulose matrix (RC) without extra treatment to fabricate environment-friendly RC–AO dielectric nanocomposites via a simple dissolution/regeneration pathway. Effects of Al 2 O 3 nanoparticles on the structure and dielectric properties of RC–AO nanocomposite films were systemically investigated. The results showed that the RC–AO films exhibited excellent comprehensive performance, including increased dielectric constant, reduced dielectric loss, improved breakdown strength and high energy storage density. Particularly, the high energy density of 5.7 J cm −3 was achieved at the breakdown strength of 380 MV m −1 when the Al 2 O 3 content was 5 wt%. Furthermore, the composites possessed excellent thermal conductivity, stability and mechanical property. This work provides a good choice for the development of high-performance and ‘green’ natural polymer-based dielectric materials. Graphic abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 3
·2763-2776
·
IF 3.553
Yu Yucong,Shi Xiaolong,Liu Lin,Yao Juming
Nowadays high porosity aerogels are widely applied in wastewater purification, while the fragility and unversatility of nascent cellulose aerogels limited the application in oil/water filtering separation. Here, highly compressible, elastic, superhydrophobic cellulose/poly(vinyl alcohol) (PVA) composite aerogels were fabricated via combination of chemical cross-linking, freeze drying and silanization. The obtained cellulose/PVA aerogels exhibited durable superhydrophobicity with WCA of 156.6 °, even maintaining 155.0 ° after 30 days. Synergistic effects of physical entanglement, chemical cross-linking and H-bond network between cellulose and PVA molecular chains endowed the aerogels with excellent compressibility and recoverability. The aerogels exhibited maximum compressive stress of 490.7 kPa at 90% strain, even without reduction in mechanical strength under 70% compressive strain for 10 cycles. More importantly, the strengthened aerogels exhibited remarkable separation performances for both immiscible oil/water mixtures and surfactant-stabilized water-in-oil emulsions. Fascinating permeation flux of up to 7176.3 L m −2 h −1 and total separation amount as high as 4550.6 L m −2 with separation efficiency of 98.5% for water-in-cyclohexane emulsion were harvested. Thus, this work provides a green, sustainable and mass-producible cellulose-based aerogel for high-efficiency oily wastewater remediation.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1469-1488
·
IF 5.044
Lu Ya,Han Jingquan,Ding Qinqin,Yue Yiying,Xia Changlei,Ge Shengbo,Van Le Quyet,Dou Xiaomin,Sonne Christian,Lam Su Shiung
Abstract Shape memory hydrogels attract increasing attention due to their promising applications as intelligent biomaterials for actuators, biomedicine and sensory applications. Nonetheless, the integration of synergistic characteristics providing good mechanical properties and ideal self-recovery rate still remains a challenge. To tackle this, we develop a novel nanocomposite hydrogel by radical polymerization. TEMPO-oxidized cellulose nanofibers (TOCNs) with high strength and ultra-high aspect ratio were introduced to improve the energy dissipation mechanism and enhance the fatigue resistance of polyacrylamide (PAAM) hydrogel. Interestingly, the nanocomposite hydrogel displays unprecedented shape memory properties through coordination with Fe 3+ . The resulting TOCN/PAAM hydrogel achieves excellent energy dissipation capability (9.68 MJ m −3 at 60% strain), satisfactory viscoelasticity (51.1 kPa) and good self-recovery rate (about 93.2% after 30 min recovery). In particular, the 3% TOCN/PAAM-Fe 3+ hydrogel exhibits better tensile performance. This nanocomposite hydrogel with good shape memory properties and excellent mechanical strength has broad application prospects in soft actuators and sensory research. 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）