Sugar Tech
·
2020
·Vol. 22
·期 6
·1138-1147
·
IF 1.198
Li Xin,Deng Ligao,Li Yi,Li Kai
Polylactic acid (PLA) is biodegradable and biocompatible, but some of its functional properties limit its commercial application. To improve the properties of PLA without destroying other useful characteristics, a composite film consisting of microcrystalline cellulose (MCC) and PLA was prepared. In this research, MCC was obtained from bagasse bleached pulp by hydrochloric acid hydrolysis. After being modified by a silane coupling agent (KH550), the MCC was used as reinforcement in the PLA matrix. The degradation performance of the composite film was explored using degradation experiments in which the film was buried in soil. According to the single-factor experiments, the best composite formulation was 3% KH550, 20% KH550-MCC and 15% acetyl tributyl citrate. The results showed that the interfacial compatibility of the MCC/PLA composite films was improved after MCC was modified with KH550. This research showed that the addition of MCC can enhance the degradation rate of MCC/PLA composite films.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Jinli Qin,Zhaolu Wang,Jie Hu,Yuan Yuan,Ping Liu,Li Cheng,Zhengqing Kong,Ke Liu,Shouke Yan,Jianming Zhang
Rod-like cellulose nanocrystals (CNCs) show the intriguing liquid crystal self-assembly ability. The understanding of the self-assembly behavior of CNCs is of fundamental importance for constructing cellulose-based functional materials . The presented work explores how the liquid crystal self-assembly behavior of CNCs is affected by the grafted ionic liquids (IL) [VBIm][BF 4 ]. The results demonstrate that the IL modified CNC (CNC-IL) with positive charged form chiral nematic structure in suspensions, which was normally observed in negative charged ones. Significantly, such liquid-crystalline organization can be obtained under much lower concentration (as low as 1.0 wt%) than that of the non-functionalized CNCs prepared from paper pulp (~ 3.0 wt%). Moreover, for CNC-IL concentrations varying from 1.0 to 4.0 wt%, the tactoids (showing obvious fingerprint texture) coexist with the disordered CNC phase, rather than separating into two phases. Unlike original CNCs, the pitch of chiral nematic tactoids increases with increasing concentration of CNC-IL. Our study suggests that the distinct liquid crystal self-assembly behavior of CNC-IL is related to the restricted mobility of CNCs rods due to the increase in CNCs particle size and the high viscosity of CNC-IL suspension as the result of IL surface modification. The study of the liquid crystal assembly behavior of IL modified CNCs provides some new insight to understand the intriguing chiral nematic self-assembly of CNCs and for construction of CNC-IL reinforced nanocomposites .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Qianqian Shang,Jianwen Cheng,Lihong Hu,CaiYing Bo,Xiaohui Yang,Yun Hu,Chengguo Liu,Yonghong Zhou
Cellulose/tannic acid/castor oil (CNF/TA/ICO) aerogels were prepared through the co-precipitation of tannic acid (TA) and castor oil-based siloxane (ICO) on cellulose nanofiber (CNF) surface and subsequent freeze-drying. The CNF/TA/ICO aerogels had the properties of lightweight, low density, high porosity, excellent hydrophobicity/superoleophilicity, and great recyclability. Adsorption study demonstrated that the adsorption capacity of the CNF/TA/ICO aerogel to various oil and organic solvents could reach 53.2–113.8 g g −1 , and the aerogel displayed favorable recyclability after 10 cycles. Moreover, the CNF/TA/ICO aerogel could be used as a filter to achieve the efficient separation of water-in-oil emulsions with separation efficiency higher than 94.4%. The successful fabrication of the multifunctional CNF/TA/ICO aerogel facilitates the comprehensive utilization of biomass resources . The facile and mild preparation method, green and eco-friendly raw materials, excellent adsorption capacity, and high separation efficiency make the CNF/TA/ICO aerogel a promising material for efficient oil recovery and emulsion separation with great applicability.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Kefeng Zhang,Yanjun Pang,Changzhou Chen,Miao Wu,Yuxiang Liu,Shitao Yu,Lu Li,Zhe Ji,Jinhui Pang
In this study, the anti-freezing conductive hydrogel electrolytes with outstanding mechanical properties were synthesized by a facile and feasible method. The mechanical and anti-freezing properties of the synthesized polyacrylamide/lithium lhloride/water soluble cellulose acetate (PAM/LiCl/WSCA) hydrogels are significantly enhanced with the addition of WSCA and LiCl. The tensile strength and toughness of the gels were gradually increased to 341 KPa and 1.2 MJ/m 3 , respectively. The hydrogel electrolyte can remain soft and flexible at −80 °C, displaying certain elasticity and electrical conductivity . In addition, the super-capacitor assembled with PAM/LiCl/WSCA hydrogel as electrolyte showed excellent stability in capacitance retention after 500 times of folding cycles and 10,000 times of charge and discharge tests. The capacitor still maintains 64.64 % of its capacity at −40 °C. This facile strategy to fabricate anti-freezing conductive hydrogel electrolyte provides a new idea and way to the application of hydrogels as electrolytes in extreme cold environments.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Shuo Zhang,Yanqiu Pan,Wei Wang,Runze Lin,Xuewu Liu
Nanofibrillated cellulose (NFC)/chitosan (CS) composite aerogel with underwater superoleophobicity was prepared by freeze-drying for oil/water separation. The soft-ice freezing technique was employed to construct cellular pores for improving the mechanical performance while enhancing mass transfer of freeze-drying. The dielectric-aided microwave heating was adopted to enhance heat transfer of freeze-drying. The results showed that the prepared NFC/CS aerogel exhibited an excellent mechanical property with a stress of 87.16 kPa at 80% strain, and underwater superoleophobicity with all oil contact angles above 150˚. The proposed drying method could save over 40% of drying time, achieving a simultaneous mass and heat transfer enhancement of freeze-drying. The prepared aerogel provided separation efficiencies of all above 99.96% and average permeate fluxes of 0.817 and 0.826 L·m −2 ·s −1 after 20 cycles for oil/water and oil/seawater separations. The research results are expected to provide an economical and sustainable solution for the industrial oily wastewater treatment .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Bin Zhou,Xiaoqian Hu,Jinjin Zhu,Zhenzhen Wang,Xichang Wang,Mingfu Wang
Layer-by-layer (LBL) assembled films have been exploited for surface-mediated bioactive compound delivery. Here, an antioxidative hydrogen-bonded multilayer electrospun nanofibrous film was fabricated from tannic acid (TA), acting as a polyphenolic antioxidant, and poly(ethylene glycol) (PEG) via layer-by-layer assembly. It overcame the burst release behavior of nanofibrous carrier, due to the reversible/dynamic nature of hydrogen bond, which was responded to external stimuli. The PEG/TA nanofibrous films disassembled gradually and released TA to the media, when soaked in aqueous solutions. The release rate of TA increased with increasing bilayer number, pH and temperature, but decreased with enhancing ionic strength. The surface morphology of the nanofibrous mats was observed by scanning electron microscopy (SEM). The following antioxidant activity assay revealed that it could scavenge DPPH free radicals and ABTS + cation radicals, a major biological activity of polyphenols. This technology can be used to fabricate other phenolic-containing slowly releasing antioxidative nanofibrous films.
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CARBOHYDRATE POLYMERS
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2022
·
IF 10.723
Shumin Zhang,Fang Ding,Ying Liu,Xuehong Ren
Anti-infections therapy accompanied with effective hemorrhage control is highly urgent in clinics. Herein, a biomimetic nanoreactor encapsulated self-healing hydrogel with glucose-responsive catalytic activity was constructed for synergetic antibacterial defense and hemostasis . A metal-organic frameworks (MOF)-based nanocatalyst loaded with glucose oxidase (GOx) was fabricated and encapsulated in the bacterial cellulose (BC) reinforced hydrogel, while the sustained release of GOx could catalyze the decomposition of glucose for triggering the MOF-mediated catalytic activity to in situ generate OH for bacteria killing . Importantly, this nanozyme-based hydrogel exhibited excellent hemostatic property owing to the enhanced absorption capacity, which provides the essential glucose from blood for triggering the glucose-responsive antibacterial activity simultaneously. Antibacterial tests revealed that the hydrogel exhibited significant antibacterial efficacy and biofilm inhibition ability in the presence of normal blood level of glucose. Such design of biocatalytic hydrogel for synergistic hemostatic and antibacterial application brings new insight for nanozyme-based biomedical therapies.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Lin Si,ZeKun Shi,JiaYi Hou,ChengXia Miao,Qin Hou,Zhixiang Xu,Shiyun Ai
Herein, a facile, environmental-friendly, and sustainable strategy for efficient separation, conversion, and utilization of lignocellulose components was developed. Lignocellulose components were separated by green deep eutectic solvent (DES). The extracted lignin had potential for downstream production of aromatic chemicals and was used to synthesize lignin-doped carbon dots (CDs) in a ratiometric fluorescent probe for detecting biogenic amines (BAs) that were generated from food spoilage. The preparation of CDs provided an efficient strategy to convert biomass waste into carbon-based nanomaterials. This probe exhibited a sensitive, rapid, and linear response to BAs with a low detection limit of 0.045 μM. The retained cellulose with the crystal I structure was used to prepare cellulose nanofibers (CNFs) via oxidation and mechanical treatment. Furthermore, the CNFs were used as a matrix to fabricate CDs/CNFs films for real-time and visual food freshness monitoring. From biomass waste to rational applications, this study not only expanded the comprehensive utilization of lignocellulose in a green and environment-friendly manner but also demonstrated the prospects of CDs-based composite films in on-site monitoring of food quality and safety.
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Zongze Yao,Shu Mi,Bin Chen,Fei Liu,Haining Na,Jin Zhu
The acylation modification of cellulose to make it processable is an important method to utilize this green, renewable material with broad prospects. However, it usually takes several hours or even more than 20 h to obtain products with a high degree of substitution (DS) through the methods reported in the existing literature, especially for cellulose acetate (CA). In this study, rapid homogeneous acylation of cellulose is achieved in a novel CO2 switchable solvent system by using microwave heating. CA products with DS ranging from 1.83 to 2.91 can be obtained within 3–15 min by using acetic anhydride as the acylation reagent. This strategy can also be applied for the synthesis of a series of cellulose esters with different side chain lengths, and it takes only 10 min to produce cellulose esters with a DS higher than 2.20 under microwave heating. This study suggests a facile and effective method for the synthesis of cellulose esters.
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Coatings
·
2020
·Vol. 10
·期 11
·1032
·
IF 2.436
Chengrong Qin,Wei Wang,Wei Li,Song Zhang
Paper packaging materials have been widely applied in our daily life. To maintain the quality of packed goods as well as the mechanical property, there is a need to enhance the paper water vapor barrier function. Although long-chain cellulose esters with saturated aliphatic chains have been employed as barrier coatings due to their excellent hydrophobicity as well as film-forming properties, the coated unsaturated cellulose esters would be beneficial to design reactive materials to further enrich their functionalities, e.g., antibacterial performance. Herein, solutions of cellulose undecenoyl esters (CUEs) were bar-coated to base papers. Obvious coating films were formed on the paper surfaces from the coating grammage of 6.25 g m−2. The resulting CUE-coated papers displayed good mechanical performance, hydrophobicity, and water vapor barrier property (the barrier ratio up to 66.35%), and the best coating grammage was 11.62 g m−2. Additionally, the reactivity of the coated paper was evaluated by further immobilization of the antibacterial agent (polyhexamethylene guanidine hydrochloride (PHGH)) using photo-click thiol-ene and condensation reaction. The generated paper exhibited good antibacterial and water vapor barrier performance. The obvious reactivity of our CUE-coated paper indicated the great possibility to design multi-functional paper packaging materials.
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MATERIALS LETTERS
·
2020
·
IF 3.204
Pengxiang Yu,Xiao Wang,Kangmin Zhang,Dengjian Zhou,Mingyuan Wu,Qingyun Wu,Jiuyi Liu,Jianjun Yang,Jianan Zhang
In the present work, high concentration graphene dispersion was prepared by sonication-assisted liquid-phase exfoliation (LPE) using inexpensive and environment-friendly aqueous cellulose solution. The highly efficient exfoliation of starting graphite into graphene was achieved by the noncovalent affinity of cellulose towards graphene. The obtained aqueous graphene sheets exhibited remarkably high concentration of 8.54 mg mL −1 with fewer defects (I D /I G ~ 0.53) and multi-layers structures, which promised a potential ideal candidate for applications in antistatic, corrosion protection, and electromagnetic compatibility.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Yu Guo,Rongbo Guo,Xiaoshuang Shi,Shujuan Lian,Qiannan Zhou,Ying Chen,Weifeng Liu,Wei Li
In this study, cellulose-based superabsorbent hydrogel was synthesized from sodium carboxymethyl cellulose (CMC-Na), acrylic acid (AA), and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) to enhance its water absorbency and salt tolerance for soil-conditioning applications in areas suffering from drought and soil salinization. Superabsorbent hydrogels (SHs) were prepared by CMC-Na and AMPS successfully, using chemical graft technology. Structure, morphology, thermal stability , and water absorbency of SHs were deduced. The cellulose-based hydrogel showed a high salt tolerance that the maximum water absorbency reached 604 and 119% in distilled water and saline water, respectively. The swelling behavior in aqueous solvents indicated that the water absorption of hydrogels was improved with the increasing ratio of CMC-Na. All SHs exhibited adsorption of nitrogen with the maximum adsorption of ammonia nitrogen 30 mg·g −1 and the presence of hydrogels could slow down the loss of nutrients in the soil. This study provided a feasible strategy that AMPS was substituted by CMC-Na to synthesize SHs with strong water absorbency and high salt tolerance which could be efficiently applied in agriculture as a soil conditioner.
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危险品化学品经营许可证（带存储）