Materials
·
2017
·Vol. 10
·期 6
·572
·
IF 2.654
Chao Li,Qingde Li,Xiaohui Ni,Guoxiang Liu,Wanli Cheng,Guangping Han
A modified coaxial electrospinning process was used to prepare composite nanofibrous mats from a poly(methyl methacrylate) (PMMA) solution with the addition of different cellulose nanocrystals (CNCs) as the sheath fluid and polyacrylonitrile (PAN) solution as the core fluid. This study investigated the conductivity of the as-spun solutions that increased significantly with increasing CNCs addition, which favors forming uniform fibers. This study discussed the effect of different CNCs addition on the morphology, thermal behavior, and the multilevel structure of the coaxial electrospun PMMA + CNCs/PAN composite nanofibers. A morphology analysis of the nanofibrous mats clearly demonstrated that the CNCs facilitated the production of the composite nanofibers with a core-shell structure. The diameter of the composite nanofibers decreased and the uniformity increased with increasing CNCs concentrations in the shell fluid. The composite nanofibrous mats had the maximum thermal decomposition temperature that was substantially higher than electrospun pure PMMA, PAN, as well as the core-shell PMMA/PAN nanocomposite. The BET (Brunauer, Emmett and Teller) formula results showed that the specific surface area of the CNCs reinforced core-shell composite significantly increased with increasing CNCs content. The specific surface area of the composite with 20% CNCs loading rose to 9.62 m2/g from 3.76 m2/g for the control. A dense porous structure was formed on the surface of the electrospun core-shell fibers.Keywords:cellulose nanocrystals;coaxial electrospinning;core-shell structural nanofibers;thermal properties;fiber morphology
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 81
·51281-51289
·
IF 3.108
Yong Liu,Zili Li,Yaohui You,Xiaogang Zheng,Jing Wen
FePO4 catalysts with branch-like, flower-like, and spherical morphologies were synthesized for the conversion of methyl cellulose to 5-hydroxymethylfurfural (5-HMF) via a hydrothermal route. The molar ratio of Fe3+ and H2PO4− ions in the reaction system played a crucial role in the morphology of FePO4. Compared with flower-like, spherical and amorphous FePO4, branch-like FePO4 presented a better catalytic performance in the cellulose conversion and 5-HMF yield. The branch-like FePO4 retained a branch structure after recycling five times in the bi-phasic reaction process. The insolubility of low temperature and partial dissolution of elevated temperature were responsible for the excellent catalytic activity of the FePO4 phase-change catalyst. The combined effect of H+ ions and iron species generated from the hydrolysis of FePO4 can be favorable for the enhanced yield of 5-HMF.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2017
·Vol. 7
·期 18
·1700739
·
IF 16.721
Dawei Zhao,Chaoji Chen,Qi Zhang,Wenshuai Chen,Shouxin Liu,Qingwen Wang,Yixing Liu,Jian Li,Haipeng Yu
A flexible, transparent, and renewable mesoporous cellulose membrane (mCel-membrane) featuring uniform mesopores of ≈24.7 nm and high porosity of 71.78% is prepared via a facile and scalable solution-phase inversion process. KOH-saturated mCel-membrane as a polymer electrolyte demonstrates a high electrolyte retention of 451.2 wt%, a high ionic conductivity of 0.325 S cm −1 , and excellent mechanical flexibility and robustness. A solid-state electric double layer capacitor (EDLC) using activated carbon as electrodes, the KOH-saturated mCel-membrane as a polymer electrolyte exhibits a high capacitance of 110 F g −1 at 1.0 A g −1 , and long cycling life of 10 000 cycles with 84.7% capacitance retention. Moreover, a highly integrated planar-type micro-supercapacitor (MSC) can be facilely fabricated by directly depositing the electrode materials on the mCel-membrane-based polymer electrolyte without using complicated devices. The resulting MSC exhibits a high areal capacitance of 153.34 mF cm −2 and volumetric capacitance of 191.66 F cm −3 at 10 mV s −1 , representing one of the highest values among all carbon-based MSC devices. These findings suggest that the developed renewable, flexible, mesoporous cellulose membrane holds great promise in the practical applications of flexible, solid-state, portable energy storage devices that are not limited to supercapacitors.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2017
·
IF 4.873
Shaoping Qian,Kuichuan Sheng
To toughen brittle poly(lactic acid) (PLA) composites, surface-modified bamboo cellulose nanowhiskers (BCNW) were introduced into a PLA matrix. The BCNW was treated with (3-mercaptopropyl)trimethoxysilane (A-189) at five concentrations between 1 wt% to 16 wt% to improve compatibility. Silylated BCNW-toughened PLA composite films were further fabricated by solution casting . The coupled reaction between A-189 and cellulose via Si-O-C bonding and hydrogen bonding was confirmed. BCNW was silylated uniformly and maintained its original morphology. With increasing concentration, BCNW became smooth; however, with excessive coupling agent, the BCNW surface became rough. Elongation at break was inversely proportional to tensile strength and tensile modulus . Elongation at break increased to 250.8% after the 4 wt% A-189 treatment compared to 12.35% with untreated composites. The C/O ratio of BCNW decreased after coupling agent treatment. There were physical interlocks and hydrogen bonding between two phases. A wire-drawing phenomenon was observed on the tensile fractural surface. The thermal degradation stability decreased with the increasing treatment concentration.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Ting Liu,Enyong Ding,Feng Xue
Natural polymer flocculants for wastewater treatment have received close attention in recent years. Here we used two flocculants, polyacrylamide and poly( N , N -dimethylacrylamide) grafted cellulose nanocrystals synthesized by a “macro-RAFT assisted” strategy, for the flocculation of kaolin suspension. The flocculation performance of these two flocculants, including flocculants dosage, settling time and floc size, was carefully studied and compared. Results suggested that poly( N , N -dimethylacrylamide) grafted cellulose nanocrstyals showed better flocculation performance than polyacrylamide grafted ones. Meanwhile, their flocculation behavior was also compared with other cellulose-based flocculants in literature and we suggested polymer modified cellulose nanocrstals as flocculants might have higher flocculation performance, but this needs further verification.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 9
·2065
·
IF 4.2
Jinsong Zeng,Chen Wu,Pengfei Li,Jinpeng Li,Bin Wang,Jun Xu,Wenhua Gao,Kefu Chen
Given the widespread prevalence of viruses, there is an escalating demand for antimicrobial composites. Although the composite of dialdehyde cellulose and silver nanoparticles (DAC@Ag1) exhibits excellent antibacterial properties, its weak mechanical characteristics hinder its practical applicability. To address this limitation, cellulose nanofibers (CNFs) were initially ammoniated to yield N-CNF, which was subsequently incorporated into DAC@Ag1 as an enhancer, forming DAC@Ag1/N-CNF. We systematically investigated the optimal amount of N-CNF and characterized the DAC@Ag1/N-CNF using FT-IR, XPS, and XRD analyses to evaluate its additional properties. Notably, the optimal mass ratio of N-CNF to DAC@Ag1 was found to be 5:5, resulting in a substantial enhancement in mechanical properties, with a 139.8% increase in tensile elongation and a 33.1% increase in strength, reaching 10% and 125.24 MPa, respectively, compared to DAC@Ag1 alone. Furthermore, the inhibition zones againstEscherichia coliandStaphylococcus aureuswere significantly expanded to 7.9 mm and 15.9 mm, respectively, surpassing those of DAC@Ag1 alone by 154.8% and 467.9%, indicating remarkable improvements in antimicrobial efficacy. Mechanism analysis highlighted synergistic effects from chemical covalent bonding and hydrogen bonding in the DAC@Ag1/N-CNF, enhancing the mechanical and antimicrobial properties significantly. The addition of N-CNF markedly augmented the properties of the composite film, thereby facilitating its broader application in the antimicrobial field.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2025
·
IF 2.3
Qu Mengnan,Deng Yuan,Liu Hui,Wang Yuqing,Sun Cai-Li,He Jinmei
Triboelectric nanogenerator (TENG) is a promising energy harvesting device for harvesting renewable mechanical energy. Some materials used in triboelectric nanogenerator inevitably pollute the environment, so the development of green triboelectric materials has attracted widespread attention. Herein, we chose a non-toxic sodium carboxymethyl cellulose (CMC), which has poor tribopositive properties due to the carboxymethyl group contained in it. Thus, the tribopositive polarity of CMC is enhanced by doping hydroxy-rich polyvinyl alcohol (PVA) with strong electron-donating ability. Rough and porous CMC/PVA polymer blend films with strong tribopositive polarity and environmental friendliness were prepared by a simple physical blending strategy. The open-circuit voltage ( V OC ) and short-circuit current ( I SC ) were optimized to be 380 V and 49 µA, respectively, for a CMC/PVA mass ratio of 10:3, and the maximum power density of CMC/PVA-TENG was 1.32 mW/cm 2 . This study provides a feasible approach for enhancing the tribopositive properties of materials by doping modification and the development of green triboelectric nanogenerators.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Zihao Li,Zuozhu Yin,Wenbo Xiao,Yuhua Chen,Chenggang Yang,Yidan Luo,Zhen Hong,Mingshan Xue
Given the increasing contamination of freshwater supplies, it is essential to effectively treat industrial wastewater. However, treating industrial wastewater using a single method is challenging due to the presence of complex contaminants like petroleum, organic dyes, bacteria, and other complex contaminants. In this study, we present a straightforward and scalable approach to prepare multifunctional nanocellulose-based membranes (NM) that exhibit superhydrophobicity, self-cleaning, oil/water separation, photocatalysis, and anti-bioadhesion properties. To begin with, we created NM by extruding fiber slurry onto a stencil and drying it. Next, we built a polyurethane (PU)/ZIF‐8/1H, 1H, 2H, 2H‐perfluorooctyltriethoxysilane (POTS)-based superhydrophobic layer by spraying it over the NM's surface. By employing the aforementioned processes, we successfully integrated multiple functions into a single superhydrophobic NM. Our results demonstrate that the NM-PU/ZIF-8/POTS membrane exhibits superior hydrophobicity performance, with a high-water contact angle (166.8 ± 0.8°) and a low rolling angle (5 ± 0.3°). Moreover, these samples retain high-water contact angles and low rolling angles even in harsh environments such as acid and alkali solutions, high temperatures, abrasion resistance, UV aging resistance, bending and folding, tape peeling, and self-cleaning. The NM-PU/ZIF-8/POTS membrane also exhibits high and stable oil-water separation performance, with a separation efficiency of 94.6% and a relatively high separation flux (133.2 L·m −2 ·h −1 ). At the same time, the NM-PU/ZIF-8/POTS membrane exhibits water-in-oil emulsion separation ability. The membrane’s stability, effectiveness, and reusability were demonstrated through ten repetitions of degradation experiments using aqueous methylene blue solution, with the NM-PU/ZIF-8/POTS membrane exhibiting an excellent degradation rate (>94%). Finally, the bioadhesion resistance test indicated a reduction of 69.1% in the adhesion rate of the NM-PU/ZIF-8/POTS membrane. Overall, the creation of the NM-PU/ZIF-8/POTS membrane serves as a useful inspiration for the practical application of superhydrophobic NM in multifunctional integration, while also broadening the scope of membrane applications.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Bowen Chen,Weizhi Zhu,Xiaolin Huang,Houkai Huang,Shenghong Shi,Zhiwei Tang,Yiqiang Wu,Yalan Li,Fangchao Cheng
With the massive consumption of energy resources and increasingly severe environmental problems, the development of renewable, environmentally friendly, highly efficient energy conversion and storage devices has become a top priority. Here, a microstructure modulation strategy was proposed to fabricate the oriented regenerated cellulose (ORC) dielectric composites with outstanding mechanical and dielectric properties via a combination of dissolution, crosslinking, stretching, and hot-pressing techniques. ORC films with a stretch ratio of 100 % (ORC-100 film) exhibit a significant increase in displacement values (2.96 µC/cm 2 ), breakdown strength (404.04 MV/m), dielectric constant (14.37 at 1 kHz), and energy density (3.42 J/cm 3 at 250 MV/m) as compared to the unstretched regenerated cellulose films. These enhancements are attributed to the anisotropic alignment of cellulose chains and the enhanced crystalline phase of cellulose II, both of which are significantly higher in ORC-100 film. This work offers a feasible and serviceable approach for the development of environmentally friendly cellulose dielectric composites with high performance.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shicheng Wang,Xiaolei Guo,Xu Zhang,Haifeng Lu,Haifeng Liu
Reactive drying is a promising method for optimizing the drying and comminution of biomass. This paper investigated the reactive drying mechanism and the mechanical properties of three major components of biomass: cellulose (CL), hemicellulose (HL), and lignin (LN). The results indicated that HL was most significantly affected by temperature, with weight loss observed in the following descending order: HL > LN > CL. Based on FTIR and 13 C NMR analyses, the chemical structure changes of these three components differed and the reactive drying mechanism was revealed. Specifically, the temperature range of 105–150 °C was primarily associated with dehydration reactions, while processes such as depolymerization of CL and HL as well as decarboxylation of LN occurred within the temperature range of 150–200 °C. The Young’s modulus at different temperatures was measured using AFM, revealing that the Young’s modulus changes were ranked as HL > CL > LN. The impact of reactive drying on Young’s modulus could be attributed to the breakage of molecular chains due to the depolymerization of HL and CL, in addition to the thermal movement of the molecular chains.
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2025
·
IF 4.8
He Wentao,Tan Lei,Wu Yongjia,Wei Yongchun,Chen Yiyang,Li Dan,Wang Guxia,Qian Yongqiang,Guo Shengwei
Cellulose is a bio-based material that has garnered increasing research interest due to its abundant reserves and excellent properties. However, its inherent flammability limits its widespread use. This study addresses this issue by combining cellulose with industrial waste fly ash (FA), not only mitigating its flammability but also transforming FA into a value-added product. Through hot pressing and freeze-drying processes, flame-retardant cellulose/FA films and foams were developed. This experimental method not only enhances the application potential of cellulose but also promotes the high-value reuse of FA, aligning with sustainable development principles. SEM images reveal good interaction between FA and cellulose. In terms of thermal performance, the maximum decomposition rates of C1-Fx and C2-Fx decreased systematically with increasing FA content. The addition of FA significantly improved flame retardancy, with the limiting oxygen index (LOI) of C1-F30 and C2-F30 reaching approximately 31% and 29%, respectively. Furthermore, the peak heat release rate of C2-Fx significantly decreased from 363.6 to 118.2 kW/m 2 , and the total heat release dropped from 7.3 to 4.1 MJ/m 2 . In summary, this study successfully utilized industrial waste FA to develop a bio-based flame-retardant material through a straightforward process, offering a viable solution to enhance the flame retardancy of cellulose and promote the reutilization of industrial waste.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Shihao Wang,Xiaoyu Cheng,Tao Ma,Shasha Wang,Shilong Yang,Wenyuan Zhu,Junlong Song,Jingquan Han,Yongcan Jin,Jiaqi Guo
Hydroxypropyl cellulose (HPC) is a sustainable cellulose derivative valued for its excellent biocompatibility and solubility and is widely used in various fields. Recent scientific research on high-substituted HPC mainly focused on its efficient preparation and phase transition behavior. Herein, a novel strategy of high-substituted HPC synthesis was demonstrated by employing DMSO/TBAF·3H 2 O as a cellulose solvent, exhibiting more efficiency than traditional approaches. High-substituted HPC prepared has remarkable thermal stability , exceptional hydrophilicity , and satisfactory solubility. Phase transition behavior of HPC with varying molar degrees of substitution (MS) was delved and a notable negative correlation between MS and cloud point temperature ( T CP ), was revealed, particularly evident at an MS of 12.3, where the T CP drops to 33 °C. Moreover, a unique self-assembly behavior featuring structural color and responsiveness to force in a solvent-free environment emerged when the MS exceeded 10.4. These insights comprehensively strengthen the understanding and knowledge of high-substituted HPC, simultaneously paving the way for further HPC investigation and exploitation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）