GREEN CHEMISTRY
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2022
·Vol. 24
·期 22
·8760-8769
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IF 11.034
Zhihan Tong,Wen Wang,Suqing Zeng,Yaxu Sun,Juan Meng,Yongzhuang Liu,Qinqin Xia,Haipeng Yu
Cellulose with numerous hydroxyl groups and electronegative atoms can form extensive hydrogen bonds, which are non-negligible obstacles to its dissolution and further utilization. Herein, an in-depth understanding of the interactions between solvent and cellulose, including binding energy, Gibbs free energy, and reaction rate constant, was pursued to screen for appropriate hydrogen bond donor–acceptor couples to form a new type of metal salt hydrate-based eutectic solvent that functions as molecular scissors to dissolve cellulose at room temperature. The optimal solvent exhibits a strong hydrogen bond accepting ability that is capable of breaking the strong hydrogen bonds within cellulose, and thus can spontaneously and efficiently dissolve various types of cellulose, with clear advantages of low cost, environmental friendliness, simple operation, energy efficiency, scalable productivity, and recyclability.
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Materials Today Chemistry
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2022
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IF 7.613
K. Jin,X. Ji,J. Zhang,Q. Mi,J. Wu,J. Zhang
Multi-colour afterglow materials have attracted widespread attention recently, because they not only can eliminate the interference of scattered light and background fluorescence, but also store the richer information. In this work, the phosphorescence emission of cellulose-based nitrogen-doped carbon dots (CDs) was transferred to the rhodamine derivatives via an efficient radiative energy transfer process, because of the strong electrostatic attraction interactions between the positive charged CDs and the negative charged rhodamine derivatives. As a result, multi-color afterglow luminescence with tunable emission and wide color gamut was realized from blue-green to green, yellow, orange and red. With the contribution of the excellent processability of polymer materials, multi-color afterglow films, coatings, fibers and patterns were readily obtained, indicating a practical application in advanced anti-counterfeiting and multiple-mode information encryption. Such a facile, universal and efficient strategy to construct multi-colour afterglow materials inspires us to understand the luminescence process and design novel afterglow materials.
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Coatings
·
2022
·Vol. 12
·期 11
·1734
·
IF 3.236
Jiaxin Zhao,Xiaoxiao Wu,Xushuo Yuan,Xinjie Yang,Haiyang Guo,Wentao Yao,Decai Ji,Xiaoping Li,Lianpeng Zhang
Cellulose is one of the most abundant, widely distributed and abundant polysaccharides on earth, and is the most valuable natural renewable resource for human beings. In this study, three different particle sizes (250, 178, and 150 μm) of Neosinocalamus affinis cellulose were extracted from Neosinocalamus affinis powder using bio-enzyme digestion and prepared into nanocellulose (CNMs). The cellulose contents of 250, 178, and 150 μm particle sizes were 53.44%, 63.38%, and 74.08%, respectively; the crystallinity was 54.21%, 56.03% and 63.58%, respectively. The thermal stability of cellulose increased gradually with smaller particle sizes. The yields of CNMs for 250, 178, and 150 μm particle sizes were 14.27%, 15.44%, and 16.38%, respectively. The results showed that the Neosinocalamus affinis powder was successfully removed from lignin, hemicellulose, and impurities (pectin, resin, etc.) by the treatment of bio-enzyme A (ligninase:hemicellulose:pectinase = 1:1:1) combined with NH3·H2O and H2O2/CH3COOH. Extraction of cellulose from Neosinocalamus affinis using bio-enzyme A, the smaller the particle size of Neosinocalamus affinis powder, the more cellulose content extracted, the higher the crystallinity, the better the thermal stability, and the higher the purity. Subsequently, nanocellulose (CNMs) were prepared by using bio-enzyme B (cellulase:pectinase = 1:1). The CNMs prepared by bio-enzyme B showed a network structure and fibrous bundle shape. Therefore, the ones prepared in this study belong to cellulose nanofibrils (CNFs). This study provides a reference in the extraction of cellulose from bamboo using bio-enzymes and the preparation of nanocellulose. To a certain extent, the utilization of bamboo as a biomass material was improved.Keywords:Neosinocalamus affinis;cellulose;nanocellulose;bio-enzymes;particle size
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CARBOHYDRATE POLYMERS
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2022
·
IF 10.723
Li Xia,Linlin Li,Yewen Xiao,Feng Xiao,Wei Ji,Shaotong Jiang,Hualin Wang
An intelligent bionic trilayer fibrous membrane is developed via electrospinning for the moisture-adjusting of a storage space. The trilayer is composed of a hydrophobic inner layer of cellulose acetate (CA), a super hygroscopic intermediate layer of gelatin (GA) and a hydrophilic outer layer of ethylene-vinyl alcohol copolymer (EVOH). The hierarchical pore networks of EVOH/GA/CA (∼2.45/∼4.5/∼36.0 μm) and the asymmetry wettability endow the membrane with outstanding directional water transport capacity. Specifically, the membrane has an excellent accumulative one-way transport index (1293 %), a remarkable overall moisture management capacity (0.91) and a reasonably high water evaporation rate (0.59 g h −1 ). The target membrane can regulate the relative humidity (RH) from 75 % to 50 % without extra energy consumption, which is capable of extending the shelf-life of jerk beef by ∼100 % under surrounding temperature of 25 °C and humidity of 75 % RH.
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PubMed
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ACS Sustainable Chemistry & Engineering
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2022
·
IF 9.224
Lei Zhang,Jingyu Wang,Renliang Huang,Mei Cui,Wei Qi,Zhimin He,Rongxin Su
Cellulose nanocrystals (CNCs) are renewable and multifunctional plant-based nanoparticles that are industrially produced by controlled sulfuric acid hydrolysis, resulting in a large amount of acid–sugar mixture, which has potential to be recovered and concentrated for reuse. However, the removal of sugar from the acid–sugar mixture, which was produced by cellulose biomass hydrolysis, is essential before acid recycling. In this study, the acid–sugar mixture was separated from the CNC hydrolysate, and then, a combination process of diffusion dialysis (DD) using anion-exchange membranes and electrodialysis (ED) was used to remove the sugar from the acid–sugar mixture. The operation parameters were optimized and Fenton oxidation (FO) was applied to degrade sugar with a decrease in the chemical oxygen demand (CODCr) in the wastewater. As a result, 98.8% sulfuric acid was totally recovered in a practical process, with 92.2% recovery by diffusion dialysis and 87.1% by electrodialysis, and more than 90% sugar was rejected. CODCr in the wastewater decreased to <500 mg/L by FO treatment. Furthermore, CNCs prepared with the recovered sulfuric acid showed a crystallinity, surface charge, and morphology similar to that prepared with fresh acid. Therefore, this combination process of DD and ED is a green and economic feasible way for acid recycling for sustainable CNC production.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
·
IF 9.463
Dong Wang,Haiying Yang,Qingxiang Wang,Yi Lu,Jie Yan,Wanli Cheng,Orlando J. Rojas,Guangping Han
As a result of fatigue and damage, the durability of separation membranes remains a major challenge for long-term use in the separation of multiphase systems, such as oily water and emulsions. Here, we synthesize electrospun membranes based on hydrolyzed polyacrylonitrile reinforced with cellulose nanocrystals (CNC). The nanofibers form highly porous systems that are held together by crosslinking, allowing fast mass transport while achieving high tensile strength and elongation at break. The membranes exhibit shape retention upon immersion in complex fluids. An underwater oil contact angle of 141° enables efficient emulsion separation (98.2 % separation at a flux as high as 1293 L·m −2 ·h −1 for hexane-in-water emulsions) and reliable operation for at least 20 filtration cycles. A similar performance is achieved in the separation of emulsions based on toluene, petroleum ether, diesel, and vegetable oils. Overall, the designed composite membranes endow stable three-dimensional structures, excellent durability, and separation performance.
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FOOD HYDROCOLLOIDS
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2022
·
IF 11.504
Yijie Wang,Xiufeng Li,Ting Li,Yang Wang,Jie Jiang,Xuhui Zhang,Jing Huang,Bihua Xia,Ho Cheung Shum,Zhenzhong Yang,Weifu Dong
Designing solid particles with desirable interfacial affinity from plant-based ingredients is a key area in sustainable food production. Here, a chemical approach is introduced to fabricate conjugate particles by combining a water-insoluble plant protein (zein) and a hydrophilic polysaccharide (cellulose) through Schiff-base reaction. Zein assembles and precipitates into anisotropic particles after forming conjugates with cellulose . The wettability of conjugate particles at the interface can be precisely engineered by adjusting the ratio of the hydrophobic and hydrophilic components. The three-phase contact angle of a water droplet sitting on the substrate made of particles can be adjusted in a range from around 130°–40° when they are submerged in corn oil. The interfacial absorption kinetics of conjugate particles shows 2 to 4 times improvement than the particles made from sole material sources. The optimal polymer ratio is found to be 1:1.5 and 1:2 (zein:cellulose) for the corn oil-water system. In association with the enhanced interfacial affinity, emulsions stabilized by conjugate particles exhibit superior stability against droplet coalescence and bulk phase separation when going through the isoelectric point of the protein (around pH 6), high ionic strength, long-term storage, and thermal treatment. It has been found that 0.5 wt% conjugate particles are enough to stabilize emulsions containing more than 60 vt% oil.
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COMPOSITES SCIENCE AND TECHNOLOGY
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2022
·
IF 9.879
Ying Wang,Shiyu Fu,Lucian Amerigo Lucia,Hui Zhang
Flexible sensors have been widely applied in wearable devices recently. These devices are prone to abrasion, crack, and accidental damage, which result in function failure or even abandonment aggravating environmental degradation. Therefore, it is a huge challenge to endow the flexible sensors with self-healability, recyclability as well as high mechanical property. Herein, a novel recyclable, highly stretchable, self-healing eutectogel was fabricated by freeze-thaw of polyvinyl alcohol (PVA), gelatin and dialdehyde carboxymethyl cellulose (DCMC) in a deep eutectic solvent (DES) with strain rate , humid and temperature sensing capability. The composite eutectogel consisted of imine bond and hydrogen bond reversible networks, which endowed the eutectogel with faster self-healability, as well as the green and simple recyclability. It performed satisfying tensile strength (up to ∼1.25 MPa) with unexceptionable fracture elongation (∼1400%). By leveraging the DES to inhibit freezing and dehydration, the eutectogel was fabricated with a wide working temperature (−20.9 to 64.1 °C) while its weight and sensing performance remained stable after 30 days in open air. The composite eutectogel sensor manifested reliable mechanical and electrical properties under repetitive deformation operation and sensitive responsiveness to real-time variation of rate, temperature, and humidity, which well mimics human breathing in time. Amazingly, based on the hydrolysis of the imine and hydrogen bonds, the recyclable eutectogels retained vast majority of mechanical strength , adhesion, and conductivity. Compared to most synthetic soft materials, the composite eutectogels provide a promising strategy for the development of sustainable multifunctional soft materials that have high environmental adaptability and practical applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Wenbin Zhang,Keyan Yang,Xiangsheng Han,Hongzhen Cai,Wenyu Lu,Yanhao Yuan,Shunyi Zhang,Feng Gao
In this work, the cellulose nanofibers based membranes with both high dye solution flux and rejection rates were obtained. The cellulose nanofibers (PPCNFs) were prepared from pomelo peels by simple H 2 O 2 oxidation process , decorated with ZIF-8 crystals, and vacuum filtrated to form composite membranes (PPCNFs@ZIF x ). Ascribing to the highly porous structures of ZIF-8, as well as their uniform and stable deposition on the surfaces of PPCNFs, the resultant membranes were mechanically strong (tensile strength up to ~72.25 MPa), surface area rich (~ 199.46 m 2 /g), and with a maximal dye solution flux of ~32.3 L m −2 h −1 bar −1 and dye rejection rates larger than 85 % (89.95 % for methyl blue , 98.83 % for methyl violet, 95.91 % for malachite green , 95.36 % for rhodamine 6 G, and a high rejection rate of ~98.6 % toward methyl violet after 30-day cycles). Thus, this work paved a simple and green way to fabricate cellulose nanofibers based membranes with high performance in the remediation of dye contaminated water.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Shanshan Ma,Hejun Li,Chang Li,Bo Li,Jie Fei,Yangbing Wen
The scale-up preparation of aramid nanofiber (ANF) and cellulose nanofiber (CNF), still faces serious challenges such as extreme production cost and lengthy preparation cycle. Herein, a feasible top-down strategy was proposed to achieve the efficient reclamation of waste resources, further realizing the large-scale production of high value-added nanofibers. The ANF/CNF as nanoscale building blocks and their reinforcement effects on the mechanical performances of carbon fiber/phenolic composites were investigated. Related strength and modulus of ANF/CNF-enhanced composites in the tensile, bending, shear and nano indentation tests, increased by 118.1% (tensile strength), 141.2% (tensile modulus), 142.2% (flexural strength), 354.4% (flexural modulus), 38.8% (shear strength) and 94.4% (elastic modulus), respectively. Our work offers a valuable reference in the fabrication of low-cost ANF/CNF derived from waste resources, which would facilitate the wide application of nanofibers in fabricating high-performance advanced functional materials.
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高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Jingshan Rao,Chaoyi Shen,Zhichao Yang,Olaniyi Amos Fawole,Jiangkuo Li,Di Wu,Kunsong Chen
Much attention and endeavor have been paid to developing biocompatible food packaging films. Here, ethyl cellulose (EC) and polyvinylpyrrolidone (PVP) were fabricated into films through a facile method, microfluidic spinning. Morphology observations showed that the fibers were neatly arranged with an average diameter of 1–4 μm. FTIR and X-ray diffraction analysis suggested the existence of good compatibility and interaction between EC and PVP. Thermogravimetric analysis demonstrated that PVP ameliorates the thermal properties; moreover, the tensile properties were improved, with tensile strength (TS) and Young's modulus up to 11.10 ± 1.04 MPa and 350.16 ± 45.46 MPa, respectively. The optimal formula was EC/PVP (2:3), of which the film displayed an enhanced TS of 4.61 ± 1.15 MPa and a modified water contact angle of 61.8 ± 4.4°, showing fine tensile and hydrophilic performance. This study provides a facile and green film fabrication method promising to be used for food wrapping.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Jing Fan,Xinyan Fan,Yunfeng Guo,Yonggui Wang,Zefang Xiao,Haigang Wang,Daxin Liang,Yanjun Xie
The surface functionalization of cellulose nanocrystals (CNC) is crucial for promoting their diverse applications, especially regarding their use as sustainable biobased polymer reinforcements. In this study, we develop poly (vinyl alcohol) (PVA)–CNC composites with improved tensile strength and gas-barrier performance using CNC-based nanofillers. Acrylated CNCs (ACNCs) were prepared from cellulose via one-pot acid hydrolysis/Fischer esterification ; subsequently, surface modification was performed through a thiol–ene reaction to obtain surface-thiolated ACNCs, namely, DACNC, MACNC, and PACNC. The various functional groups on the surface-thiolated ACNCs not only affect the dispersion stability but also alter their interfacial interactions with the PVA matrix, thus realizing the PVA nanocomposites with tailored properties, including the thermal properties, mechanical properties, and gas barrier performance. This study demonstrates that surface-thiolated ACNCs with appropriate surface chemistry and loading levels can serve as excellent nanofillers for PVA, forming biobased composites with desired properties.
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