CARBOHYDRATE POLYMERS
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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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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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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 56
·期 3
·2763-2776
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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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FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 7
·1550-1559
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IF 1.797
Mahmud Sakil,Long Yu,Abu Taher Muhammad,Hu Han,Zhang Ruoyu,Zhu Jin
Poly(butylene 2,5-furandicarboxylate) (PBF) derived from 2,5-furandicarboxylic acid (FDCA) is an emerging bio-based alipharomatic polyester that is expected to replace its fossil-based terephthalate and naphthate homologues. PBF holds excellent gas barrier properties, but its slow rate of crystallization might restrict wider applications. To improve the rate of crystalization, it was melt-blended with crystalline micro-cellulose (CMC) to prepare a composite through twin-screw extrusion. To ensure environmental friendly conditions, neither chemicals to modify fibers nor compatibilizers to improve the filler/matrix interaction were used. Size exclusion chromatography (SEC), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA) and X-ray diffraction (XRD) were used to characterize the composite. It was observed that a longer blending duration (cyclic mode) leads to a greater reduction in molecular weight (Mw) in the presence of CMC, which can be avoided by using a shorter blending duration (direct mode). The mechanical properties of the composite showed an increase in Young’s modulus by approximately 23 % and 36 % with respect to reference PBF for the cyclic and direct mode respectively. It was further observed that, although the elongation at break and tensile strength has decreased, it has improved gas barrier properties. Thermal analysis shows faster nucleation of PBF in the presence of CMC with a minor effect on its thermal degradation.
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Polymers
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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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CARBON
·
2020
·
IF 8.821
Ping Wang,Dongxiao Zheng,Shouxin Liu,Mengkai Luo,Jian Li,Shen Shen,Shujun Li,Liangliang Zhu,Zhijun Chen
Embedding luminogens into a well-selected rigid matrix has been a particularly attractive way of preparing long afterglow materials. On this basis, seeking green, low-cost and sustainable materials or strategies, remains challenging but desirable. Prompted by the generation of wood fluorescence, a general strategy for preparing long afterglow materials successfully developed by embedding biomass-derived carbon dots into cellulose fibrils. Internal hydrogen bonding interactions between cellulose fibrils and carbon dots strongly erected a confinement effect for protecting the triplet exciton from quenching, leading to an increase of phosphorescence lifetime by seven orders of magnitude. These properties, which originated from such a green and convenient approach, were able to match most of reported long afterglow examples. Moreover, thanks to the humidity sensitivity of cellulose, the materials can behave a unique humidity-dependent phosphorescence property, showing superior potential application in advanced anti-counterfeiting and encryption.
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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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CELLULOSE
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2020
·Vol. 27
·期 15
·8843-8858
·
IF 4.21
Jiang Mengting,Zhang Yakang,Chen Jingwen,Liang Qian,Xu Song,Yao Chao,Zhou Man,Li Zhongyu
A series of morphology-controlled BiOBr nano/macrostructures was successfully synthesized via a novel biomass-route derived from bacterial cellulose (BC). In the BiOBr/BC system compared with pure BiOBr, the three-dimensional BC scaffolds not only effectively prevented the aggregation of BiOBr units by pore confinement, but also strengthened the controllability of BiOBr size with the help of abundant anchoring sites provided by cross-linked BC fibers. By associating the results of characterizations and the photodegradation of RhB dye, the relationship between morphology and photocatalytic activity of BiOBr/BC was investigated. In addition, a possible mechanism for the enhanced photocatalytic activity of the optimized BiOBr/BC has been discussed. This biomass-derived route provides a platform for further design of bismuth-based composite photocatalysts with potential advantages of being anti-aggregation, highly-dispersed, easily recovered and having enhanced catalytic performance.
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Materials Science & Engineering C-Materials for Biological Applications
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2020
·
IF 5.88
Yuanfeng Pan,Junren Liu,Kunni Yang,Pingxiong Cai,Huining Xiao
Nanogel based on polysaccharides has attracted the tremendous interest due to its unique performance as drug carrier for in vivo release. In this work, the multi-responsive nanogels were developed based on the tailor-modified sugarcane bagasse cellulose (SBC). In the presence of crosslinking agent cystamine bisacrylamide (CBA), the in-situ free radical copolymerization of methacrylated monocarboxylic sugarcane bagasse cellulose (MAMC-SBC) and N-isopropylacrylamide (NIPAM) in aqueous phase was conducted, thus leading to redox, pH and thermal-responsive nanogels. The results obtained from FT-IR, SEM and particle sizer showed that the nanogels were highly stable with the desired particle size ranging from 90 to 180 nm and contained targeted polymeric segments and linkage for multi-responsivity. Doxorubicin hydrochloride (DOX) as a model drug was effectively loaded into the nanogels, partly driven by strong electrostatic association; and the loading efficiency reached up to 82.7%. Moreover, the drug release could be readily manipulated by the addition of reducing agent, pH and temperature, which is attributed to the multi-responsive behavior of nanogels as carrier and synergetic effects. The performance of nanogels was also governed by the ratio of reactive MAMC-SBC and NIPAM during polymerization; and the ratio at 1:1(wt) led to the optimal structure of nanogels.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yanan Yin,Chenggang Zhang,Jisi Chen,Wenchao Yu,Zhuqun Shi,Chuanxi Xiong,Quanling Yang
Flexible electrostatic capacitors have many potential applications in modern electric power systems. In this study, flexible cellulose-based dielectric films were prepared by compositing regenerated cellulose (RC) and one-dimensional BaTiO 3 nanofiber (BTNF) via a simple and environmentally friendly process. To improve compatibility and distributional homogeneity of the fillers/matrix, BTNF was surface modified by dopamine to prepare the poly(dopamine) modified BTNF (PDA@BTNF). The obtained RC/PDA@BTNF composite films (RC-PDA@BTNF) possessed higher dielectric constant and breakdown strength than those of the RC and RC/BTNF composite films. In particular, RC/PDA@BTNF composite films with 2 vol% PDA@BTNF (RC-2PDA@BTNF) exhibited a high discharged energy density of 17.1 J/cm 3 at 520 MV/m, which exceeded 40 % compared with that of RC-2BTNF at 460 MV/m. Meanwhile, RC-2PDA@BTNF could continuously work for more than 10,000 times with a high efficiency of 91 %. Furthermore, the composite films could maintain good dielectric properties for a long time when stored in vacuum condition (under 0.3 atm). Therefore, these flexible cellulose-based dielectric materials are promising in the field of novel high-performance film dielectric capacitors.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yuting Liang,Hongxiang Zhu,Lei Wang,Hui He,Shuangfei Wang
Biocompatible smart dual-responsive cellulose nanofibres were designed and prepared by grafting a temperature and pH dual-responsive polymer (PEI-NIPAM: polyethyleneimine– N -isopropylacrylamide) on cellulose nanofibres (CNF-COOH). The smart cellulose nanofibres showed good antibacterial activity (above 99%) against Escherichia coli and excellent biocompatibility based on acute systemic toxicity, in vitro cytotoxicity, skin irritation, and skin sensitisation analyses. CNF-PEI-NIPAM showed an excellent dual-response performance to pH and temperature, affording the CNF-PEI-NIPAM aerogel with a high loading capacity (330.12 mg/g) for doxorubicin and a high cumulative release rate (59.45 %) at 37 °C and pH 3. These advantages enable the smart cellulose nanofibres to be applied in the fields of food and biomedicine. Interestingly, the interaction between the collapse and expansion of the dual-responsive polymer molecular chains on the CNF-COOH was revealed based on in situ characterisation of the solid materials, which is valuable for the structural design and application of cellulose-based dual-responsive smart nanofibres.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Xin Huang,Li Wang,Jiabo Zhang,Xiaojing Du,Shijia Wu,Hongxin Wang,Xinlin Wei
A new type of double-network hydrogel, cross-linked with microcrystalline cellulose grafted with ε-polylysine (MCC-PL) and N , N -methylene bisacrylamide/acrylic acid, was synthesised to efficiently inhibit bacterial proliferation and remove heavy metals. The physicochemical properties of the MCC-PL hydrogel (MCC-PLH) were characterised using scanning electronic microscopy, Fourier transform infrared spectroscopy , X-ray diffraction, thermogravimetric analysis , and differential thermogravimetric analysis . The adsorption results showed that the optimal adsorption conditions were temperature of 313 K at pH of 5 and 6 of Pb 2+ and Cu 2+ , respectively. The adsorption mechanism of MCC-PLH5 was successfully determined using Freundlich isotherm, pseudo-second kinetics, and intra-particle diffusion model, in conjunction with X-ray photoelectron spectroscopy. Adsorption thermodynamic studies indicated that the process was spontaneous and endothermic. Antibacterial experiments showed that PL-grafted MCC hydrogel exhibited more efficient and durable antibacterial activity than MCC, indicating its potential for water decontamination.
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