CELLULOSE
·
2019
·Vol. 26
·期 16
·8813-8827
·
IF 3.917
Wang Ying,Xiao Guifa,Peng Yangyang,Chen Liheng,Fu Shiyu
Abstract A self-healing hydrogel containing acylhydrazone bond and disulfide bond with pH and redox dual responses was prepared by crosslinking dialdehyde carboxymethyl cellulose (DCMC) with 3,3′-dithiobis(propionohydrazide) (DTP). The pH, gelator concentration and oxidation degree of DCMC affected the formation of DCMC-based self-healing hydrogels seriously. Interestingly, addition of cellulose nanofibers (CNFs) improved the mechanical property of the DCMC-based self-healing hydrogel and its efficiency. When 1.0 wt% CNFs was added in hydrogel preparation, the compressive strength (1.05 MPa) of the composite hydrogel increased by 275% and its strain rose to 74.6%. The healing rate of hydrogel containing 1.0 wt% CNFs was 82.7% at 0.5 h and 89.9% at 1 h, which was much faster than that of original hydrogel (51.6% at 0.5 h and 58.5% in 1 h). DCMC-based dual responsive self-healing hydrogel showed good biocompatibility confirmed by cytotoxicity test, which is potential to implement in medial field. Graphic abstract
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Peng Tao,Yuehua Zhang,Zhengmei Wu,Xiaoping Liao,Shuangxi Nie
In this work, cellulase, low-concentration cold alkali and cellulase combined with cold alkali were used to pretreat unbleached bagasse pulp from which cellulose nanofibrils (CNFs), about 30 nm in diameter, were successfully prepared through ultrafine grinding and high-pressure homogenization. X-ray diffraction analysis showed that cellulase pretreatment increased the crystallinity of CNFs. After low-concentration cold alkali pretreatment, the crystallinity of CNFs significantly reduced and the crystal structure of the cellulose changed from type I to type II. Thermogravimetric analysis showed that CNFs prepared by cellulase combined with cold alkali treatment produced more regenerated cellulose and had lower thermal stability. The use of cellulase and low-concentration cold alkali pretreatments combined with ultrafine grinding and high-pressure homogenization is an environment-friendly method for preparing CNFs. The use of low-concentration cold alkali reduces the consumption of alkali and clean water.
研究领域:
生物技术
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材料科学
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产品关联
DOI
PubMed
高影响因子
Micro & Nano Letters
·
2018
·Vol. 13
·期 11
·1574-1579
·
IF 0.841
Longwei Jiang,Jingde Yang,Qian Wang,Lili Ren,Jiang Zhou
In the present work, needle-shaped cellulose nanocrystals (CNCs) were prepared from commercial microcrystalline cellulose (MCC) through esterification and ultrasound treatment. The prepared CNCs were characterised by using Fourier transform infrared, degree of substitution (DS), dynamic light scattering, scanning electron microscopy and X-ray diffraction. The results revealed that the ultrasound disintegration of MCC was significantly improved after the esterification with maleic anhydride and the ultrasound treatment did not affect DS of the CNCs. With increasing power of the ultrasound treatment, smaller CNCs with narrower size distribution could be obtained. Average diameter and length of the CNCs could reach ∼14 and ∼180 nm, respectively. Furthermore, the crystal structure of cellulose was not changed during the esterification and ultrasound treatment and crystallinity of the CNCs increased comparing with MCC.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Qiuyan Zhang,Xiaohui Liu,Yuanlin Ren,Yuesheng Li
Developing a sustainable fire resistant regenerated cellulose fiber for realizing large scale industrial production is an urgent research topic. In this work, a cellulose-based flame retardant filler, phosphorylated microcrystalline cellulose, was successfully synthesized. The acquired phosphorylated cellulose (P-Cell) as a modified bio-based flame retardant was cost-effective and compatible with cellulose spinning dope. The preparation process of fire resistant fiber was the same as the lyocell fibers on a factory scale pilot production. The lyocell fibers loaded with 20 wt% P-Cell exhibited favorable thermal stability and fire retardancy. The char residue amount of fire resistant lyocell fibers remarkably increased by 118% at 700 °C compared with the pure lyocell fibers. As micro combustion calorimetry estimated, the total heat release and peak heat release rate of modified fibers significantly decreased by 87.6% and 82.4%, respectively compared with those of pure lyocell fibers. The flame retardant mechanism was ascribed to the formation of phosphorus-containing oxides and char layer in the condensed phase and the generation of incombustible compounds in the gaseous phase .
研究领域:
材料科学
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纺织工程
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可持续发展
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产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2022
·
IF 0
Jin Yang Zhang,Jin Ling Li,Qian Qiao,Rui Wang,Fei Liu,Hai Ning Na,Jin Zhu
In this paper, cellulose solution was obtained by dissolving cellulose in CO2 switchable solvent, and the CNF spinning solution was prepared by mixing cellulose solution with cellulose nanofibrils (CNF) by physical blending. CNF reinforced all-cellulose composite fibers were prepared by wet-spinning. The spinning solution with good dispersion of CNF can be obtained. The rheological property test showed that the solution has spinnability. The composite fibers were subsequently prepared by wet-spinning. The structure and properties of the composite fibers were analyzed by FT-IR, XRD, SEM, TGA, and mechanical properties testing. The results showed that the chemical structure of the composite fiber was the same as that of cellulose, but the aggregate structure became amorphous, which resulted in deceased thermal stability. The composite fibers had dense and solid structure without any cavity. The mechanical strength of the composite fiber was upto 1.12cN/dtex.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Lida Xing,Jin Gu,Weiwei Zhang,Dengyun Tu,Chuanshuang Hu
Polymorphism is an important factor associated with the cellulose nanomaterial properties. In this study, cellulose fibers (CFs) were efficiently isolated from waste Tetra pak packages, and cellulose I and II nanocrystals were produced by treatment of CFs with 64% sulfuric acid and controlling the reaction time from 15 to 30 min. Cellulose I (CI) was partially converted to cellulose II (CII) within 15 min and the resulting cellulose nanocrystal product (i.e. CNC15) contained 93.2% CII. Further extending the hydrolysis time decreased the CII content of CNC20 to 25.5% and CNC30 was completely CI without CII. CNC15 (285.1 ± 120.7 nm long, 50.6 ± 16.5 nm wide, 0.64 at% sulfur) was much thicker, slightly longer, less thermal stable and contained more sulfate groups than CNC30 (207.2 ± 77.8 nm long, 23.2 ± 7.8 nm wide, 0.34 at% sulfur). CNCs with controllable allomorph may have potentially diverse applications.
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Yuan Zhou,Qiang Zhang,Zhaoxia Xia,Zhaojiang Wang,Libin Liu,Yuanzhang Jiang,Yanting Han,Linshen Xie,Lin Tan,Yong Zhang
Blending modification is used to improve the hemocompatibility of cellulose acetate (CA) dialysis membranes while endowing the CA membrane with endotoxin scavenging and antibacterial capabilities. First, polydopamine (PDA) and polyethylenimine (PEI) are used as negatively charged and positively charged moieties, respectively, together with cellulose nanocrystals (CNCs) to construct mixed charge CNCs (PEI-PDA@CNCs). Then PEI-PDA@CNCs is blended with the CA casting solution, and the modified CA dialysis membrane is prepared through a phase inversion process. Through biocompatibility, adsorption, antibacterial, and filtration experiments, various properties of PEI-PDA@CNCs modified CA membrane (PDCA) are systematically tested. The results show that the PDCA membrane exhibited good blood compatibility and noncytotoxicity. At the same time, the PDCA membrane has antibacterial properties and excellent endotoxin adsorption capacity. Compared with the CA membrane, the clearance rates of PDCA membrane for Staphylococcus aureus and Escherichia coli reach 54.0% ± 1.5% and 52.9% ± 5.9% respectively. In the dynamic adsorption experiment, the adsorption capacity of PDCA membrane for endotoxin increases to 2322.1 ± 45.9 EU/g. The research results indicate that PEI-PDA@CNC-modified multifunctional CA membrane with endotoxin adsorption and antibacterial properties has potential application prospects in the fields of hemodialysis and blood purification.
研究领域:
材料科学
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生物医学工程
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纳米技术
·
血液透析
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 38
·49127
·
IF 2.52
Yue Tang,Han-Qing Wang,De-Fa Hou,Huang Tan,Ming-Bo Yang
This article focuses on controlling the morphology of regenerated cellulose aerogel (RCA) and its application as a template for the preparation of functional cellulose nanoparticles (FCNPs). RCA is prepared by lyophilizing cellulose hydrogel which is fabricated through a sol–gel method in sodium hydroxide (NaOH)/urea aqueous solution. The morphology of RCA is adjusted by varying the gelation temperature and time. With the gelation temperature and time increasing, lamellar RCA transforms into strings of cellulose nanoparticles. Subsequently, RCA with the morphology of "strings of nanoparticles" is modified through the bulk condensation of l -lactic acid and RCA. Eventually, the prepared functionalized RCA (FRCA) is dispersed in an organic solvent to obtain purified FCNPs. The results demonstrate that single FCNP can be obtained by dispersing FRCA in dimethyl sulfoxide. Moreover, the prepared FCNPs have uniform size, good thermal-stability, and increasing hydrophobicity, which are ideal candidates for polymer composites in terms of fillers.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Qihong Zhang,Zhaohui Lu,Chen Su,Zongmiao Feng,Hui Wang,Jingbo Yu,Weike Su
Traditional methods of enzymatic hydrolysis of cellulose to cellulose nanocrystals (CNCs) are limited due to the low enzymatic efficiency and large amount of waste liquid. The purpose of this study is to improve the yield and production efficiency of CNCs by enzymatic hydrolysis. A one-step mechano-enzymatic hydrolysis method was developed by utilizing the synergy of wet grinding and enzymatic hydrolysis reaction to efficiently prepare CNCs. Under the optimal reaction conditions, the maximum CNCs yield of 49.3% was achieved with higher thermal stability and crystallinity index of 76.7%. Mechano-enzymatic hydrolysis followed the first order pseudo-kinetics, and fractal kinetics demonstrated that mechanical force of rotation speed affected the fractal dimensions and binding ability between substrate and enzyme. This study provides an alternative method to prepare CNCs, which can significantly avoid the use of bulk water, improve the production efficiency of CNCs and thus lower the production cost.
研究领域:
材料科学
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化学工程
·
生物技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2014
·
IF 2.871
Jiapeng Fu,Dawei Li,Guohui Li,Fenglin Huang,Qufu Wei
We report a facile approach to synthesize and immobilize silver nanoparticles (AgNPs) onto carboxymethyl cellulose (CMC)-modified electrospun cellulose nanofibers and demonstrate the potential application of as-prepared AgNPs-CMC/cellulose composite nanofibrous mats as effective biosensor substrate materials. Cellulose nanofibers were prepared by the combination of electrospinning with deacetylation. Then, CMC was adsorbed onto cellulose nanofibers to complex silver ions through the chemical binding with the free carboxyl groups of CMC for subsequent reductive formation of AgNPs . The AgNPs-CMC/cellulose nanofibers immobilized with laccase (Lac) by electrostatic interactions were used as biosensor substrate materials for catechol detection. The cyclic voltammetries revealed that the AgNPs-CMC/cellulose nanofibers was beneficial to the immobilization of Lac and facilitated the direct electron transfer between Lac and electrode. Lac/AgNPs-CMC/cellulose/glassy carbon electrode exhibited a detection limit of 1.64 μM (S/N = 3), and a wide linear range from 4.98 μM to 3.65 mM, as well as good repeatability, reproducibility, stability, and selectivity. The CMC/cellulose nanofibrous mats have great potential applications as substrate materials for different biosensors by immobilizing other different functional nanoparticles or enzyme on them.
研究领域:
材料科学
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生物传感
·
纳米技术
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产品关联
DOI
高影响因子
CELLULOSE
·
2017
·Vol. 25
·期 1
·205-216
·
IF 3.417
Xu Qinqin,Song Longchu,Zhang Lihua,Hu Gang,Chen Qin,Liu Enhui,Liu Yu,Zheng Qiang,Xie Haibo,Li Nanwen
The reversible reaction of the hydroxyl groups in cellulose with CO 2 in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) results in a rapid and effective derivative dissolution of cellulose in DMSO, by which a series of cellulose acetate propionate (CAP) and cellulose acetate butyrate (CAB) with various degrees of substitution (DS) were synthesized controllably without adding external catalysts. Wherein DBU not only achieves the dissolution of cellulose, but also acts as an efficient organocatalyst for the subsequent cellulose derivatization. The DS of CAB and CAP can be tuned by changing the feed molar ratio of propionic (butyric) anhydride/acetic anhydride and the reaction temperature. The structural and thermal properties of the products were characterized by several analytical techniques including NMR, FT-IR, and TGA. The CO 2 /DBU/DMSO dissolution system provides a new platform for controllable synthesis of mixed cellulose esters with high efficiency under mild conditions.
研究领域:
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Haiqiao Zhang,Yan Wu,Jilei Zhang,Zhihui Wu,Xianxu Zhan
Cellulose nanocrystals (CNC) have been applied in many fields with excellent properties, however, efficient extraction of CNC from biomass materials remains a challenge. This study proposed and evaluated a method for preparing CNC from microcrystalline cellulose (MCC) by combining chemical hydrated deep eutectic solvent (DES) with mechanical high shear force methods. Specifically, when treatment time was increased, the yields of CNC increased from 27.2 % (0.5 h) to 65.2 % (2.5 h). The X-ray diffraction patterns indicate that the obtained CNC possesses the same type of crystal structure as the MCC (cellulose Ι). Transmission Electron Microscopy analyses determined that CNC has an average diameter of 25.1–33.3 nm and a length ranging from 281.3 nm to 404.2 nm. Moreover, the duration of treatment had no significant effect on the changes in morphology and dimension of CNC. This method is more eco-friendly than conventional hydrolysis, as well as faster than other DES treatments, which paves the way for CNC to be produced from MCC.
研究领域:
材料科学
·
化学工程
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）