CARBOHYDRATE POLYMERS
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2015
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IF 4.074
Hairong Zhang,Haijun Guo,Bo Wang,Silan Shi,Lian Xiong,Xinde Chen
In this work, bacterial cellulose (BC) was activated by ethylenediamine (EDA) and then dissolved in lithium chloride/N,N-dimethylacetamide (LiCl/DMAc) aqueous solutions. The resulting transparent solution was cast on a glass plate to prepare regenerated BC. Then cationic BC was prepared homogeneously by the reaction between regenerated BC and 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride (CHPTAC) in a NaOH/urea aqueous solution. Structure and properties of the BC and its products were characterized by different techniques such as X-ray diffraction (XRD), Fourier transform spectroscopy (FT-IR), scanning electron microscopy (SEM) and thermo-gravimetric analysis (TGA). The results showed that there was no significant difference between the structures of BC, activated BC and regenerated BC. The effects of different temperature and molar ratio of CHPTAC to anhydroglucose unit (AGU) on the degree of substitution (DS) value were examined. The DS values of cationic BC ranged between 0.21 and 0.51.
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Journal of Materials Chemistry B
·
2014
·Vol. 3
·期 4
·620-628
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IF 0
Xilun Weng,Zongbi Bao,Zhiguo Zhang,Baogen Su,Huabin Xing,Qiwei Yang,Yiwen Yang,Qilong Ren
Organic–inorganic hybrids incorporating cellulose tris(3,5-dimethylphenylcarbamate) (CDMPC)-functionalized silica particles can exhibit a high loading capacity with high loadings of the chiral selector. These materials offer considerable potential for use in preparative chiral separations. However, the preparation of these hybrid particles with high surface areas and controlled organic/inorganic ratios is challenging. We have found that by controlling the pH of sol–gel step and regulating the ratio of the inorganic precursor over CDMPC, unique functional hybrid particles could be prepared with optimum pore structure, novel interfacial features and excellent mechanical strength. The morphological features of these hybrid particles were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The organic content was determined by thermogravimetric analysis (TGA) and pore structure determined by Brunauer–Emmett–Teller (BET) analysis. These new hybrid particles exhibit excellent solvent durability, which is crucial for preparative chromatography. HPLC analysis of columns, packed with this material, confirmed solvent tolerance such as for chloroform, giving potential applications for large scale chromatographic separations.
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JOURNAL OF CHROMATOGRAPHY A
·
2014
·
IF 4.258
Dihui Huang,Qin Yang,Shanxia Jin,Qianchun Deng,Ping Zhou
In this work, a new cellulose derivative, octadecyl modified quaternized cellulose (ODMQC), was synthesized and used as additive in the background electrolyte for capillary electrophoresis. The derivative bearing hydrophobic groups and hydrophilic groups can self-assemble into a stable nano-scaled micelle structure in aqueous solution. When ODMQC was added in running buffer, the capillaries were shown to generate applicable anodal EOF over the investigated range of pH 3.0–12.0. Due to the lack of UV active groups, the ODMQC did not disturb the UV detection. It is shown that ODMQC-added capillaries allow the separation of basic proteins by reducing their adsorption onto the capillary wall. Also, the addition of ODMQC provides adequate separation of aromatic acids with low p K a values and improved separation of sulfa drugs. Moreover, it is demonstrated that the addition of ODMQC can incorporate an additional reversed-phase mechanism that improves the separation of neutral analytes.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 36
·
IF 1.768
Ming He,Jianjun Zhou,Huan Zhang,Zhenyang Luo,Jianfeng Yao
Microcrystalline cellulose (MCC) and its oxidized product dialdehyde cellulose (DAC) were introduced as the reinforcing filler in epoxidized soybean oil (ESO) thermosetting polymer. The composites comprising up to 25 wt % cellulose fillers were obtained via a solution casting. The reinforcing effects of the cellulose were evaluated by microstructure analysis, dynamic mechanical analysis, and tensile and thermal stability tests. The results showed that at the same filler concentration, DAC led to higher stretching strength, modulus, and break elongation than MCC. The 5 wt % DAC loading in ESO polymer exhibits the highest toughness and thermal stability due to the good dispersion and interfacial interaction between DAC and ESO polymer matrix. The increased storage modulus and glass transition temperature also indicate the cellulose fillers impart stiffness to the composites. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42488.
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ACS Catalysis
·
2015
·
IF 9.312
Ruiyan Sun,Tingting Wang,Mingyuan Zheng,Weiqiao Deng,Jifeng Pang,Aiqin Wang,Xiaodong Wang,Tao Zhang
Using cellulosic biomass to synthesize bulk quantities of high-value chemicals is of great interest for developing a sustainable biobased society. Especially, direct catalytic conversion of cellulose to glycols, important building blocks for polymers, remains a grand challenge. Herein, we report the development of a versatile binary nickel–lanthanum(III) catalyst for the conversion of cellulose to both ethylene glycol (EG) and propylene glycol (1,2-PG) in a yield of 63.7%, which is one of the best performances reported for this catalytic reaction. Especially, lanthanum(III) exhibited a high level of activity toward the degradation of cellulose (TON = 339) at a very low concentration (0.2 mmol/L). On the basis of density functional theory calculations and experimental analyses, we addressed a dual route for this catalytic mechanism: a major route involving the selective cracking of sugars into C2 molecules and a minor route involving the hydrogenolysis of sugar alcohols. Lanthanum(III) catalyzes the cleavage of the C2–C3 bond in glucose via sequential epimerization and 2,3-hydride shift reactions to form glycolaldehyde, the precursor of EG.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 43
·
IF 1.768
Xiaoqin Chen,Zuliang Liu,Weiwei Cao,Chunyan Yong,Xiaodong Xing
A viable method for coating of cellulose fiber with quaternarized N-halamine is reported in this article. The use of quaternary ammonium salt group in combination with N-halamine group can reinforce the antibacterial activity. The chemical structure of as-synthesized N-halamine precursor 4-(Bromo-acetic acid methylester)-4-ethyl-2- oxazolidinone (BEO) was characterized by 1 H-NMR. The cellulose fibers were characterized by Fourier transform infrared spectra and X-ray photoelectron spectra. The spectra data confirmed that the quaternarized N-halamine-grafted cellulose fibers were successfully obtained. The antibacterial properties of functional fibers were challenged with both Gram positive and Gram negative bacteria. The antibacterial tests and showed that the as-prepared antibacterial cellulose fibers exhibited powerful and rapid bactericidal performance against both Gram negative E. coli and Gram positive S. aureus . © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42702.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2015
·Vol. 27
·期 2
·1479-1484
·
IF 1.569
Li Jing,Cao Jun,Zhang Xiufang,Wang Song,Zheng Yingying,Pan Jiaqi,Li Chaorong
The ZnO/CdS nanocomposites have been successfully synthesized on the electrospun cotton cellulose nanofibers (CCNFs). ZnO nanorods (70–80 nm in diameter and 1 μm in length) are uniformly grown on the CCNFs by a simple hydrothermal method firstly and then different amount of CdS nanoparticles (20–30 nm in diameter) are loaded on the ZnO nanorods by the chemical bath deposition method. The visible light photocatalytic activity of ZnO/CdS nanocomposites is investigated by degradation of Rhodamine B under visible light irradiation, and it demonstrates that the photocatalytic performance of this composites is significantly enhanced compared with that of pure ZnO. Furthermore, the relatively narrow band gap and novel nanostructure of the composites are considered as the main reasons of this enhancement.
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Materials
·
2024
·Vol. 17
·期 19
·4886
·
IF 3.1
Yuxiu Yu,Weiku Wang,Yaodong Liu
This paper investigates the effects of pre-gelation on cellulose dissolved in LiCl/DMAc solutions to enhance the properties of regenerated cellulose materials. This study focuses on characterizing the crystallinity, molecular orientation, and mechanical performance of cellulose fibers and hydrogels prepared with and without pre-gelation treatment. X-ray diffraction (XRD) analysis reveals that crystallinity improvement from 55% in untreated fibers to 59% in fibers pre-gelled for 3 and 7 days, indicating a more ordered arrangement of cellulose chains post-regeneration. Additionally, XRD patterns show improved chain alignment in pre-gelled fibers, as indicated by reduced full width at half the maximum of Azimuthal scans. Mechanical testing demonstrates a 30% increase in tensile strength and a doubling of the compression modulus for pre-gelled fibers compared to untreated fibers. These findings underscore the role of pre-gelation in optimizing cellulose material properties for applications ranging from advanced textiles to biomaterials and sustainable packaging. Future research directions include further exploration of the structural and functional benefits of pre-gelation in cellulose processing and its broader implications in material science and engineering.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yueyue Zhu,Penghao Sun,Zhen Huang,He Liu,Xu Xu
The widespread use of plastics has caused serious environmental pollution, and the use of cellulose paper products to replace plastics has attracted worldwide attention. However, the rich hydroxyl groups and structure voids lead to poor barrier properties of cellulose paper products to water and oil. Herein, a rosin-based polymer coating (RB) is reported, which is prepared by cross-linking a rosin-modified silane coupling agent (RM) with hydroxyl-capped polydimethylsiloxane (OH-PDMS) and ethyl orthosilicate (TEOS). The RB can form a dense and uniform barrier layer on the surface of the cellulose paper product, so that the RB-coated paper (RB paper) exhibits excellent properties, including (1) water resistance (exhibiting a water contact angle of 102.3°, the relative water absorption rate decreased by over 90% at both 25 and 90 °C, reaching 35.1% and 45.9%, respectively), (2) oil resistance (Kit test reaches no. 10, and the relative oil absorption rate decreased by over 90% at both 25 and 90 °C, reaching 4.1% and 6.4%, respectively), and (3) high mechanical properties (tensile strength increased from 23.2 to 40.6 MPa, stronger than partly commercial plastics). Moreover, RB paper exhibits biodegradability and recyclability. These impressive performances position RB paper as a viable alternative to plastic.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yupei Sun,Qin Lu,Die Dong,Rimei Chen,Zhiping Chen,Zhen Xie,Hongxiang Zhu,Qing Bu,Hui He,Shuangfei Wang
Monitoring-guided therapy is currently the most ideal strategy for closed-loop therapy for skin tumors. Here, a bionic cellulosic in situ hydrogel was engineered by integrating the near-infrared-Ⅱ(NIR-Ⅱ) responsive upconversion nanoprobe into the near-infrared-Ⅰ(NIR-Ⅰ) responsive cellulose nanocrystal (CNC)-based in situ hydrogel for tumor imaging and ablation, dynamic detection and healing of infection wounds. Interestingly, the CNC-integrated nanointerface is noteworthy as it reduces the mutual interference of organic functional components and inorganic nanoparticles in the hydrogel. Moreover, the biocompatible hydrogel can be injected into the body to determine tumor size and location with the assistance of photoacoustic and magnetic resonance imaging, which facilitates precise photothermal ablation of tumors triggered by NIR-Ⅰ laser. The hydrogel with shape adaptability can enable it to cover irregular infection wounds, visualize its bacterial infection status by NIR-Ⅱ irradiation, eliminate drug-resistant bacteria and biofilms, and promote rapid healing of infection wounds through photothermal therapy. Such a cellulose-integrated nanointerface inspires the assembly of nanocomposites materials in hydrogels for closed-loop monitoring-therapy of skin tumors.
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BIOMACROMOLECULES
·
2024
·
IF 5.5
Qiangqiang Cui,Jing Yu,Jing Li,Cheng Zeng,Fan Bu,Xiaohong Liao,Hongzhi Hu,Zihui Liang,Chao Chen,Changhai Yi
The efficient conversion of cellulose into glucose is critical for advancing sustainable biofuels and bioproducts. Traditional methods face significant challenges, including inefficiencies and environmental concerns, highlighting the need for innovative catalytic systems. In this study, we successfully synthesized three hydroxyl-rich carbon-based solid acid catalysts─S-catalyzer, P-catalyzer, and C-catalyze. Utilizing an aqueous hydrothermal system, the S-catalyzer, characterized by high hydroxyl content and –SO3H groups, effectively mimicked cellulase activity, breaking glycosidic bonds and achieving a glucose yield of 68% with a cellulose conversion rate of 97.2% within 120 min. The catalysts also demonstrated remarkable recyclability, maintaining over 90% conversion efficiency across multiple cycles. This stability is attributed to the robustness of hydroxyl and –SO3H groups and the recycling of glucose as a carbonation substrate in a closed-loop system. Our findings provide a novel, environmentally sustainable method for cellulose hydrolysis, offering significant potential for scalable biofuel production and broader biotechnological applications.
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高影响因子
SOFT MATERIALS
·
2024
·
IF 1.6
Jing Wang,Shaopeng Lv,Xinchen Gui,Yadong Yu
Developing innovative packaging films is of great significance for extending the shelf-life of perishable fruit. In this study, we successfully synthesized antibacterial composites by incorporating Fe into reduced graphene oxides (rGO) and MoS2. The resulting rGO-MoS2-Fe2O3 composites demonstrated effective inhibition against E. coli and S. aureus. After investigating the antibacterial mechanism of rGO-MoS2-Fe2O3 composites, we utilized carboxymethyl cellulose (CMC) as a film substrate to create CMC films infused with rGO-MoS2-Fe2O3 composites. The incorporation of rGO-MoS2-Fe2O3 composites decreased the light transmittance and hygroscopicity of CMC films, while greatly enhancing the mechanical properties of CMC films. To evaluate the practical applications of these rGO-MoS2-Fe2O3-based CMC films, we conducted a strawberry preservation experiment, which revealed that CMC films supplemented with 5 wt% rGO-MoS2-Fe2O3 exhibited exceptional performance in preventing weight loss and maintaining total titratable acidity levels in strawberries. These findings highlighted the promising potential of rGO-MoS2-Fe2O3-based CMC films for fruit preservation applications.
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