MATERIALS CHEMISTRY AND PHYSICS
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2021
·
IF 4.094
Xiaotong Yi,Fang Wang,Yadong Wu,Jinmei He,Yudong Huang
Aramid nanofibers/Bacterial cellulose (ANFs/BC) nanocomposite aerogels have been successfully synthesized via a facile process. Benefiting from the hydrophilicity and negative charge on the surface, the aerogels could selectively adsorb cationic dye in effluent. Compared with slight adsorption of anionic dye methyl orange (MO), the aerogels exhibited high adsorption efficiency for cationic dye methylene blue (MB). The effect of aerogels synthesized by different mass ratios of BC and ANFs on the adsorption efficiency of MB were studied. The dyes removal efficiency (R%) towards MB was 98.8%, which was obviously higher than that of pristine BC aerogels (27.9%). The adsorption kinetic parameters suggested that it fitted the pseudo-second-order model (R 2 > 0.99) well and the adsorption process followed the Langmuir model. Besides, the effect of diverse experimental conditions such as adsorption time and initial dyes concentration on the adsorption performance of aerogels was also investigated, the adsorption capacity of aerogels could reach 54.27 mg/g. Consequently, the excellent selective adsorption of ANFs/BC nanocomposite aerogels may exhibit a promising application in effluent treatment.
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RSC Advances
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2020
·Vol. 10
·期 68
·41713-41719
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IF 3.119
Xu Meng,Yanyan Dong,Yajun Zhao,Liping Liang
This work presents a facile preparation and modification of cellulose sponge with hydrophobic/oleophilic surface wetting properties. The modification method included several steps: sodium hydroxide (NaOH) and urea were introduced to dissolve cellulose, after which calcium carbonate (CaCO3) and epichlorohydrin were added into the solution for formation of a hydrogel. Finally, the cellulose sponge was obtained through hydrochloric acid (HCl) etching of CaCO3, and octadecyl trichlorosilane (OTS) self-assembly modification. The prepared cellulose sponge exhibited hydrophobicity with a water contact angle of 153.5°, and oleophilicity with an oil contact angle of 0°. The prepared cellulose sponge demonstrated a separation efficiency as high as 92% for various types of oil/water mixtures. The prepared cellulose sponge could achieve continuous separation with the assistance of a peristaltic pump. The material will be a promising candidate to be used in oil/water separation.
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INDUSTRIAL CROPS AND PRODUCTS
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2020
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IF 4.244
Baoxia Wang,Qiang Peng,Youxian Yan,Yongliang Ding,Zhongkai Wang
Natural resilin represents one of the most famous biological materials with outstanding mechanical properties, which is the high resilience. Until now, the fabrication of hydrogels with high resilience to mimic resilin is still a challenge. Herein, a strategy is developed for the preparation of strong, tough, and high resilient hydrogels. Ceric ion/hydroxyl redox initiated graft polymerization of polyacrylamide is applied to integrate cellulose nanocrystals into the chemical networks of hydrogels. With the addition of N, N′-methylene bisacrylamide as chemical cross-linker, polymer networks with cellulose nanocrystals as net-points formed. Chemically bonded cellulose nanocrystals provide hydrogels with high strength and toughness. After mechanical pretreatment, the optimized polymer networks further provide the hydrogels with high resilience (∼92%). Moreover, the mechanical properties of high resilient hydrogels can be finely tuned via adjusting the N, N′-methylene bisacrylamide or cellulose nanocrystals contents, providing the opportunities to prepared hydrogel with high strength, high toughness, and high resilience that mimic different kind of elastic proteins.
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ACS Sustainable Chemistry & Engineering
·
2020
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IF 7.632
Bowen Sui,Yuping Zhang,Lei Huang,Yixin Chen,Daowei Li,Yunfeng Li,Bai Yang
Synthetic nanofibrillar hydrogels resembling a natural extracellular matrix have emerged as a promising material in the biomedical field; however, achievement of multifunctional nanofibrillar hydrogels with good biocompatibility is still an important and challenging task. Herein, we report a fluorescent nanofibrillar hydrogel prepared with polyethyleneimine (PEI) and cellulose nanocrystals (CNCs) via one-step hydrothermal treatment. The nanofibrillar hydrogels are mainly formed from CNCs cross-linked by carbon dots (CDs) through hydrogen bonding and hydrophobic interactions. The nanostructures and the mechanical properties of the hydrogels are controlled by weight ratios of CNCs to PEI and the total concentration of CNCs and PEI. In comparison with other hydrogels from CNCs and CDs, the nanofibrillar hydrogels exhibit better mechanical properties with relatively high Young’s moduli. The hydrogels show relatively low cytotoxicity and good biocompatibility, which are demonstrated by in vitro cell culture and in vivo subcutaneous implantation in rats. This work provides a new approach to prepare biomimetic nanofibrillar hydrogels with fluorescence properties, thus offering a promising synthetic material resembling a natural extracellular matrix for bioapplications.
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Journal of Saudi Chemical Society
·
2020
·
IF 3.517
Mutian Ma,Yongli Chen,Xu Zhao,Fengzhi Tan,Yuanhao Wang,Yafeng Cao,Weijie Cai
Cellulose sponge was proposed to an attractive bio-absorbent owing to its highly efficient, low-cost, biodegradable, and renewable sourcing. In this work, the wasted cotton linter as raw materials, the highly porous and lightweight cellulose sponges were synthesized via a facile chemical crosslinking and freeze-drying process. The resultant cellulose sponge (CA) exhibited an interconnected three-dimensional porous structure through crosslinked with N,N′-methylene bisacrylamide (MBA), which was beneficial to remove organic dyestuffs. The effects of various factors including solution pH, contact time, initial dye concentration, and ionic strength on the adsorption behavior were investigated in detail. Herein, Langmuir isotherm models were selected to determine the adsorption capacity, and the maximum theoretical adsorption capacity for Methylene blue (MB) and Crystal violet (CV) was 123.46 and 76.63 mg/g, respectively. Particularly, the results of kinetic and thermodynamic tests showed that the adsorption performance was a spontaneous endothermic reaction and the adsorption process followed the pseudo-second-order kinetic. Furthermore, cellulose sponges could maintain maximum adsorption capacity even after twelve cycles. Therefore, the eco-friendly cellulose sponge would be a promising adsorbent for effective wastewater treatment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Songyan Wang,Yuqing Lu,Xiao-kun Ouyang,Junhong Ling
In this study, we developed novel complex nanoparticles as carriers for curcumin (Cur) delivery by using soy protein isolate (SPI) and cellulose nanocrystals (CNC) as polymer matrices. We found that the SPI-to-CNC mass ratio influenced the stability and physical properties of the SPI-CNC complex nanoparticles. Moreover, SPI-CNC complex nanoparticles had a relatively small size (197.7 ± 0.2 nm) and low polydispersity index (0.14) at a 6:1 mass ratio. The nanosystem was relatively stable at different pH values (3–9), temperatures (30–90 °C), and salt concentrations (0–40 mmol/L). Furthermore, the complex nanoparticles exhibited a high encapsulation efficiency (88.3%) and sustained release during simulated gastrointestinal digestion. Therefore, SPI-CNC complex nanoparticles are a promising delivery system for hydrophobic bioactive compounds.
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CARBOHYDRATE POLYMERS
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2021
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IF 9.381
Kechun Guo,Wenzhuo Zhu,Jian Wang,Wen Sun,Shuai Zhou,Ming He
A gradient anisotropic cellulose hydrogel was prepared by the diffusion of CaCl 2 solution. The degree of orientation of the cellulose chains decreased along the ion diffusion direction, and the birefringence of the highly oriented area was up to 1.323×10 −4 . Importantly, we first propose and demonstrate the presence of sensitive region in the gradient anisotropy hydrogel. The sensitive region located in the order-disorder transition displayed large color variation with the optical path difference (R) range from 155 nm to 1200 nm, high sensitivity (1 % strain interval), low detection (minimum 1 % strain), good cycling ability of 50 times and frost resistance at −20℃. Based on this, the readable response colorimetric card was designed for micro-strain detection. The programmable Ca 2+ diffusion design made it convenient to fabricate cylindrical and tubular hydrogels. This concept of sensitive region and this flexible strategy will broaden new horizons to materials that have excellent responsive properties for optical applications, sensors and multiscale bionics architectures.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
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IF 6.155
Wencheng Liang,Mingli Jiang,Junyong Zhang,Xiaoming Dou,Yan Zhou,Yun Jiang,Li Zhao,Meidong Lang
In this work, novel antibacterial cellulose diacetate/poly(ethylenimine)/hyaluronic acid (CDA/PEI/HA) composite three-dimension (3D) scaffolds were prepared through electrospinning and post-processing. Firstly, CDA/PEI 2D composite nanofiber membranes were prepared by electrospinning, and then the CDA/PEI/HA 3D composite scaffolds were fabricated by post-processing and freeze-drying of CDA/PEI membranes. In particular, HA was added to improve the biocompatibility of composite scaffolds. Compared with CDA/PEI scaffolds, CDA/PEI/HA composite scaffolds showed higher water absorbing rate, higher water retention rate and higher mechanical strength . Moreover, CDA/PEI/HA composite scaffolds with abundant positive charge were benefit for improving antibacterial activity. CDA/PEI/HA scaffolds with biology function of HA were benefit for improving hemocompatibility and cell proliferation of CDA/PEI scaffolds. In summary, antibacterial CDA/PEI/HA scaffolds could protect wound from bacterial infection, improve cellular behavior and accelerate wound healing. Thus, CDA/PEI/HA scaffolds could be potential application for wound dressing.
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BIOMACROMOLECULES
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2020
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IF 6.092
Peiqian Zhang,Yuanyuan Ma,Mei Cui,Jieying Wang,Renliang Huang,Rongxin Su,Wei Qi,Zhimin He,Wim Thielemans
Biological pretreatment is a safe and environmentally friendly method for disrupting recalcitrant lignocellulose structures. Expansin and expansin-like proteins are used to open up the cellulose structure and display significant synergism when mixed with cellulases that catalyze the breakdown of (hemi)cellulose into sugars. However, the adsorption behavior of expansin in the presence of sugar products is yet unknown. In this work, we monitored the effects of various sugars on the real-time adsorption of Bacillus subtilis expansin (BsEXLX1) onto cellulose films using a quartz crystal microbalance with dissipation. Cellobiose and xylose at low concentrations enhanced BsEXLX1 adsorption, whereas they disrupted adsorption at higher concentrations. Arabinose and mannose continuously inhibited expansin adsorption with increasing concentration. No obvious influence of glucose and galactose on BsEXLX1 adsorption was found. Contact angle measurements and atomic force microscopy of cellulose upon BsEXLX1 adsorption in the presence of sugars showed that both hydrophilicity and roughness increased with BsEXLX1 treatment. These results give us the ability to modulate and control expansin adsorption and provide insights into effective expansin use during enzymatic hydrolysis of lignocellulose in biorefineries.
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CHINESE JOURNAL OF CHEMISTRY
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2020
·Vol. 38
·期 5
·494-500
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IF 3.826
Changzhuang Bai,Qiuhua Huang,Xiaopeng Xiong
Summary of main observation and conclusion Self-healing hydrogel such as polyacrylic acid (PAA) hydrogel has attracted increasing attention based on its promising potential applications. However, it usually suffers from low strength especially as mechanical device. Herein, a commercial microcrystalline cellulose (MCC) was modified with acrylamide to graft polyacrylamide (PAM) chains on the particle surface. The acrylamide-modified MCC (AM-MCC) was then dispersed in monomer solution of acrylic acid to prepare composite hydrogel. The mechanical properties of the obtained composite hydrogels and the self-healed hydrogels were carefully measured by compressive and tensile tests, and by dynamic mechanical analysis. Our results demonstrate that introduction of a small amount of AM-MCC such as 3 wt% can not only reinforce the original hydrogel and the healed hydrogel markedly, but also improve self-healing efficiency obviously. The analyses indicate that in addition to the reversible multi-interactions such as hydrogen bonding and ionic interactions, the entanglements between the PAA chains of the hydrogel matrix and the PAM chains grafted on the MCC particles have also played an important role on the improvement in mechanical performances and the healing ability of the hydrogel. Moreover, the responsiveness to exterior ion has been tested to indicate potential application of the composite hydrogel as self-healable sensor.
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Polymers
·
2020
·Vol. 12
·期 8
·1780
·
IF 3.426
Shunli Chen,Min Wu,Caixia Wang,Shun Yan,Peng Lu,Shuangfei Wang
The use of advanced and eco-friendly materials has become a trend in the field of food packaging. Cellulose nanofibrils (CNFs) were prepared from bleached bagasse pulp board by a mechanical grinding method and were used to enhance the properties of a chitosan/oregano essential oil (OEO) biocomposite packaging film. The growth inhibition rate of the developed films with 2% (w/w) OEO againstE. coliandL. monocytogenesreached 99%. With the increased levels of added CNFs, the fibrous network structure of the films became more obvious, as was determined by SEM and the formation of strong hydrogen bonds between CNFs and chitosan was observed in FTIR spectra, while the XRD pattern suggested that the strength of diffraction peaks and crystallinity of the films slightly increased. The addition of 20% CNFs contributed to an oxygen-transmission rate reduction of 5.96 cc/m2·day and water vapor transmission rate reduction of 741.49 g/m2·day. However, the increase in CNFs contents did not significantly improve the barrier properties of the film. The addition of 60% CNFs significantly improved the barrier properties of the film to light and exhibited the lowest light transmittance (28.53%) at 600 nm. Addition of CNFs to the chitosan/OEO film significantly improved tensile strength and the addition of 60% CNFs contributed to an increase of 16.80 MPa in tensile strength. The developed chitosan/oregano essential oil/CNFs biocomposite film with favorable properties and antibacterial activity can be used as a green, functional material in the food-packaging field. It has the potential to improve food quality and extend food shelf life.Keywords:cellulose nanofibrils;chitosan;oregano essential oil;antimicrobial;oxygen barrier properties
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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-17
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IF 12.264
Ding Chenfeng,Liu Tianyi,Yan Xiaodong,Huang Lingbo,Ryu Seungkon,Lan Jinle,Yu Yunhua,Zhong Wei-Hong,Yang Xiaoping
An ultra-microporous carbon material simultaneously with high specific surface area (1554 m 2 g −1 ) and packing density (1.18 g cm −3 ) is designed and fabricated.
The resulting carbon material integrates the high gravimetric and volumetric capacitance (430 F g −1 and 507 F cm −3 at 0.5 A g −1 ) and thereof provides the robust all-solid-state cellulose supercapacitor with high areal and volumetric density.
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