RSC Advances
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2017
·Vol. 7
·期 86
·54823-54828
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IF 3.108
Junrong Li,Liangjing Fang,William R. Tait,Luyi Sun,Lihong Zhao,Liying Qian
Conductive composite hydrogels based on sodium carboxymethyl cellulose (CMC) and polyaniline (PAn) were prepared via the semi-interpenetrating polymer network (semi-IPN) method, using glycerol diglycidyl ether (GDE) as the crosslinking agent. The structures of the resulting composite hydrogels were characterized by 13C-NMR, FT-IR, and SEM. The composite hydrogels with various concentrations of CMC presented a similar swelling kinetic behaviour and a relatively high swelling ratio. With increasing CMC concentration, both the compressive fracture stress and modulus of the composite hydrogels improved gradually. Though the modulus of the composite hydrogels increased with more GDE added, the compressive fracture stress decreased when the crosslinking density was too high. The electrical conductivity of the composite hydrogels increased first and then decreased slightly with increasing dosages of CMC and GDE. Doping with aromatic sulfonate is a good approach to improve the conductivity of the composite hydrogels and the conductivity reached 6.31 × 10−3 S cm−1 after doping with sodium benzene sulfonate (BSNa).
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International Journal of Applied Ceramic Technology
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2017
·Vol. 15
·期 4
·903-909
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IF 1.048
Huan Zhou,Mengmeng Yang,Xinye Ni,Lei Yang,Muralithran G. Kutty
Development of alternatives of bone wax to stop blood transfusion occurred in cancellous bone injury is highly deserved clinically. An ideal candidate is supposed to be not only biodegradable, biocompatible, malleable, and cost-effective, but also have comparable mechanical strength to cancellous bone. In the present work, calcium sulfate cement (CSC) based composites modified with hydroxypropyl methyl cellulose (HPMC) or sodium alginate (SA) were prepared. In brief, CSC was combined with 2, 4, 6 wt.% of HPMC or SA, respectively, followed by setting behavior evaluation, compressive strength and degradation testing, XRD, and SEM characterizations, as well as blood clotting induction study. Both additives improved the hemostatic performance of CSC, but CSC with 2% wt. SA exhibited the optimum setting time, mechanical strength, stability, and blood clotting ability. These results reveal the feasibility of using CSC–SA based composite as a substitute for bone wax.
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CELLULOSE
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2018
·Vol. 25
·期 3
·1809-1819
·
IF 3.809
Xiao He,Zhang Weibo,Wei Yicui,Chen Lihui
Zinc oxide (ZnO) is among the most interesting metal oxide with remarkable performance in electronics, semiconducting materials and photocatalysis, specially as nanomaterials. In this work, carbon/ZnO nanocomposites were designed using a low temperature precipitation process and TEMPO-oxidized (2,2,6,6-Tetramethyl-1-piperidinyloxy as TEMPO) cellulose as a reactive template. The resulting nanomaterials were characterized by XRD, SEM, TEM, BET, EDX and UV–vis spectroscopy analysis. It was found that the formation of carbon/ZnO nanocomposites with various morphologies not only involved the structure of TEMPO-oxidized cellulose but also depended on the content of the carboxyl groups of TEMPO-oxidized cellulose. In this approach, TEMPO-oxidized cellulose is not only a template provider, but is a C-provider leading to a compound into the ZnO nanocrystals which were decreased the band gaps of samples. ZnO-T12 exhibited a significant photodegradation on methyl orange with 96.11% within 120 min and good reusability.
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CELLULOSE
·
2017
·Vol. 25
·期 1
·17-22
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IF 3.417
Su Jialei,Qiu Mo,Shen Feng,Qi Xinhua
A carbonaceous solid acid catalyst bearing weakly acidic carboxylic and phenolic functional groups was facilely prepared by the pyrolysis of cow dung followed by KOH activation. The prepared carbonaceous material showed low activity for the catalytic hydrolysis of raw cellulose in water (3.6% glucose yield). However, after the cellulose was pretreated by mixing with the carbonaceous catalyst in a ball mill, cellulose hydrolysis afforded a high glucose yield of 59.3% in water at 200 °C, and the glucose yield increased to 74% under the same reaction conditions in 0.015 wt% HCl aqueous solution. The increases were attributed to the decrease in degree of crystallinity of the cellulose, as well as good contact between the catalytic domain in the catalyst and the β-1,4-glycosidic bonds in the cellulose molecules by the mix-milling pretreatment. This work provides a promising strategy for efficient cellulose hydrolysis in water by a weakly acidic solid catalyst prepared from the agricultural residues.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Haiyan Mao,Ling Lin,Zhipeng Ma,Chaoxia Wang
An acid and UV dual-responsive cellulose fabric was developed via coating with a polymeric dye based on waterborne polyurethane and azobenzene chromophore to provide additional smart characteristics for textiles. The incorporation of azobenzene chromophore into polyurethane chain through chemical bonding enhanced the thermal stability. The maximum absorption peak of the polymeric dye and its coated fabric shifted from 410 nm to 520 nm upon pH decreasing from 6 to 1, accompanying with pronounced color change from yellow to amaranth due to structural transition from diazo to hydrazone form. The acidichromic property of the polymeric dye also presents an outstanding repetition stability. The trans -isomers in the polymeric dye transformed into cis -isomers rapidly (1 s) in response to UV irradiation, while its recovery was much slower (6 h) in dark due to the large molecular and volume of polyurethane chains. Upon trans-cis isomerism, the coated fabric presented slight color change between yellow and orange after alternative UV irradiation and dark. The stimuli-responsive cellulose fabric with reversible acidichromic and photoisomeric properties can be a promising candidate for developing a wearable and flexible sensor to monitor environmental changes.
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CELLULOSE
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2018
·Vol. 25
·期 3
·1705-1714
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IF 3.809
Liu Ting,Ding Enyong,Xue Feng
Polymer grafting is an efficient way to obtain functional cellulose nanocrystals. In this work, we used a “macro-RAFT (macromolecular reversible addition–fragmentation chain transfer) agent-assisted” strategy, which adds extra amount of amphiphilic macro-RAFT agent with low molecular weight to graft poly(N,N-dimethylacrylamide) (PDMA) from cellulose nanocrystals. Successful grafting was evidenced by different characterization methods, and a high weight ratio of grafted PDMA was obtained (77.6%). The grafting process was studied through the weight ratio of grafted PDMA, monomer conversion, and the molecular weight of free and grafted PDMA at different reaction time. As a result, we have suggested that there were three types of grafted polymer chains on cellulose nanocrystals in this reaction system and discussed their evolution during the grafting reaction. Finally, we summarized several key factors for successful grafting in this macro-RAFT agent-assisted strategy.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Zhiguo Wang,Sijie Wang,Han Zhong,Hanwen Wang,Boyi Zhang,Xiaoping Rao,Jianchun Jiang
Currently, moisture-electric generators (MEGs), which can convert the energy of ubiquitous moisture into electricity, have become a trend. In this work, biomass-based generator (CMEG) with double gradient structures was prepared by two-step directed freeze-drying and Ca 2+ induced crosslinking reaction using cellulose nanofibrils (CNF), sodium alginate (SA) and calcium chloride. The composite aerogel with Ca 2+ ion concentration gradient structure was constructed by using the CNF/SA bilayer aerogel with the gradient structure of oxygen functional group as the template. The introduction of Ca 2+ ions not only further stabilized the structure of the aerogel, but also endowed the asymmetric hygroscopic between the upper and lower layers of the aerogel, resulting in a built-in water gradient. In addition, the ion gradient difference inside the aerogel was significantly enhanced by introducing an active metal electrode. Based on the above design, the CMEG exhibited leading maximum power density (128.04 μW·cm −2 ), wide temperature range (273–353 K) and long duration (110 h ) by adjusting the operating environment. And in addition to easily lighting multiple light-emitting diodes (LEDs), CMEGs could also satisfy the power supply needs of various devices through different series-parallel connection designs. More importantly, it was compatible for applications in respiratory sensing and pressure monitoring. This work provides a new strategy for the biomass-based moisture-electric generators.
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PubMed
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PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Mengnan Yu,Rongzhan Liu,Yanwei Du,Zhenyu Ni
Cotton fabric is widely used for its excellent wearability but often suffers from drawbacks such as poor stain resistance, susceptibility to corrosion, and low colorfastness. Here, we introduce a novel method to create colorful superhydrophobic cotton fabric using octadecylamine-modified dialdehyde cellulose (DAC/ODA) particles as building units, which are synthesized via a Schiff base reaction and subsequently dyed with active dyes. Leveraging the film-forming ability of ODA and the affinity between cellulose materials, DAC/ODA formed a robust coating on the cotton surface, with its microstructure precisely controlled through thermal induction. The resulting fabric (DAC/ODA/Cotton) exhibited exceptional superhydrophobicity, with a water contact angle of 155° and an osmotic pressure of 426.2 mm. The uniform coverage of DAC/ODA on cotton fibers also ensured high air permeability (33.1 mm/s). Additionally, DAC/ODA/Cotton demonstrated outstanding antifouling performance against various common liquids and water can easily remove dust from its surface. Importantly, the fabric maintains its superhydrophobicity under extreme conditions such as high temperature, UV radiation, and acid-base exposure. Even after 100 abrasion cycles, no significant changes in surface morphology and color on DAC/ODA/Cotton were observed. This fluorine-free, environmentally friendly approach offers significant potential for developing multifunctional textiles and coatings with broad applications while reducing environmental impact.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Ziyang Chang,Shuo Zheng,Shouyi Han,Xueren Qian,Xiaohong Chen,Haiping Wang,Dingqiang Liang,Daliang Guo,Yanguang Chen,Huifang Zhao,Lizheng Sha
Along with the developing of flexible electronics, there is a strong interest in high performance flexible energy storage materials. As natural carbohydrate polymer, cellulose fibers have potential applications in the area due to their biodegradability and flexibility. However, their conductive and electrochemical properties are impossible to meet the demands of practical applications. In this study, cellulose fibers were combined with polyaniline to develop novel paper-based supercapacitor electrode material. Cellulose fibers were firstly coordinated to Cu(II) and subsequently involved in polymerization of polyaniline. Not only the mass loading of polyaniline was significantly increased, but also an impressive area specific capacitance (2767 mF/cm 2 at 1 mA/cm 2 ) was achieved. The developed strategy is efficient, environmentally friendly, and has implications for the development of cellulosic paper-based advanced functional materials.
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PubMed
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JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Ting Su,Xuefeng Mao,Zhiru Wang,Yuhang Pan,Bin Xu,Wenzhong Yang,Hui Xu
Antimony is a highly poisonous pollutant that needs to be removed from water to ensured safety. In this work, we have fabricated a novel adsorbent, the ferric-manganese oxide (FeMnO x ) nanoparticles embedded cellulose nanocrystal-based polymer hydrogel (FeMnO x @CNC- g -PAA/ q P4VP, denoted as FMO@CP q P), specifically engineered for the remediation of antimony-laden water. Comprehensive evaluations have been conducted to investigate the efficacy of the FMO@CP q P hydrogel in removal of antimony from water. The hydrogel exhibits superior affinity for antimony, with maximum adsorption capacities of 276.1 mg/g for Sb(III) and 286.8 mg/g for Sb(V). The adsorptive dynamics, governed by the kinetics and isotherm analyses, elucidate that the immobilization of both Sb(III) and Sb(V) is facilitated through a homogeneous and monolayer chemisorption mechanism. The hydrogel has a three-dimensional interconnected porous structure and exhibits good swelling behavior, which facilitates the rapid absorption of antimony ions by this high surface area hydrogel into the channels. Furthermore, various effects, including the oxidation and inner-sphere coordination mediated by FeMnO x NPs and the electrostatic attractions of the quaternized P4VP chains, promote the immobilization of antimony species. Owing to its high removal efficiency, stability and reusability, the FMO@CP q P hydrogel emerges as an exemplary candidate for the removal of antimony contaminants in water treatment processes.
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THERMOCHIMICA ACTA
·
2024
·
IF 3.1
Wissam Bessa,Djalal Trache,Chahinez Ghalmi,Sabrine Aidi,Ahmed Fouzi Tarchoun,Feriel Gahfif,Amir Abdelaziz,Sourbh Thakur,M. Hazwan Hussin
A comprehensive investigation into the curing kinetics of composites based on bisphenol A aniline benzoxazine resin (BA-a) and microcrystalline cellulose (MCC) modified by phosphorylation (MCC-pH), was conducted in this study. For this purpose, differential scanning calorimetry (DSC) analysis, at different heating rates, was used to examine the curing process. The kinetic parameters as a function of conversion were determined using isoconversional approaches, i.e., iterative Kissinger-Akahira-Sunose (it-KAS), Trache-Abdelaziz-Siwani methodology (TAS), and Vyazovkin methodology. The incorporation of MCC-pH reduced considerably the curing temperatures, indicating their catalytic effect. A combination of isoconversional methods and multi-step kinetic fitting was done to elucidate the effect of adding MCC-pH on BA-a curing. The reported data exhibited the enhanced reactivity of the composite systems, which was associated with the acceleration of the regular polymerization reaction. The possible pathway of the polymerization in the presence of phosphorylated cellulose was also discussed.
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Biomass Conversion and Biorefinery
·
2024
·
IF 3.5
Li Yihui,Zhong Zhaoping,Wang Wei,Ye Qihang,Zheng Xiang,Liu Hengyuan,Yun Zekun
The valorization of cellulose in lignocellulose into high-value products is a crucial step in biorefinery processes. In this study, FeCl 3 ·6H 2 O was impregnated and supported on a carbon-based substrate, followed by carbonization and sulfonation to prepare the composite carbon-based solid acid. The resulting composite carbon-based solid acid was used as the catalyst, while γ-valerolactone, a lactone solvent, served as the reaction medium for producing furfural as the product from cellulose. When using this catalytic system to treat cellulose, under appropriate reaction temperature and residence time, the yield of furfural reached 75.26%, while the conversion rate of cellulose was 99.8%. Characterization techniques including SEM, EDS, XRD, XPS, and Py-FTIR were employed to confirm that the composite carbon-based solid acid possessed Brønsted acid sites, Lewis acid sites, and -Cl active groups, all of which exhibited excellent catalytic activity and selectivity towards furfural production. Furthermore, the synergistic effect between the catalytic activity of the three active groups in the carbon-based solid acid and the inhibitory effect of the nonpolar solvent on side reactions contributed to the outstanding performance of the catalytic system. And this study proposes a possible reaction pathway for the conversion of cellulose to furfural. This research provides an efficient pathway for the valorization of cellulose and holds significance in furfural production and biomass conversion. Graphical abstract
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危险品化学品经营许可证（带存储）