EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Suzhen Liu,Li Zhang,Xiaohong Chen,Tingting Chu,Yanzhu Guo,Meihong Niu
A novel kind of cationic cellulose- g -oligo(ε-caprolactone) amphiphilic polymer (QC- g -OCL) was obtained by homogeneous ring-opening polymerization of ε-caprolactone (ε-CL) from quaternized cellulose (QC) in 1-butyl-3-methylimidazolium chloride (BmimCl) ionic liquids. Chemical structures and properties of the copolymers were characterized by FT-IR, 1 H NMR, 13 C NMR, XRD and TGA techniques. The grafting ratios of OCL chain onto QC- g -OCL were adjusted by changing the molar ratio of CL to QC. The micelles self-assembled from QC- g -OCL were prepared by ultrasonic-assisted dissolution method, and comprehensively analyzed by dynamic light scattering (DLS), TEM and fluorescence spectroscopy techniques. The micelles were in spherical shape with average hydrodynamic radiuses (R h ) in the range of 170–237 nm. Moreover, their critical micelle concentration (CMC) values were decreased from 0.302 mg/mL to 0.089 mg/mL with increasing the degree substitution values of OCL (DS OCL ) from 0.16 to 0.60. The ζ-potentials of micelles in water were ranged from 37.2 mV to 48.3 mV, indicating that the shells of micelles were constituted by ationic quaternary ammonium group. All of these findings established that the cationic cellulose-based micelles would be a promising aqueous carrier for hydrophobic drug.
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OPTICS AND LASER TECHNOLOGY
·
2013
·
IF 1.365
Jiaojiao Wang,Miao Feng,Hongbing Zhan
The preparation and characterization of free-standing films made of a graphene oxide-carboxymethyl cellulose composite material is described. Characterization was accomplished using transmission electron microscopy , ultraviolet–visible absorption spectroscopy , Raman spectroscopy , and thermal gravimetric analysis . The nonlinear optical performance of this composite material was studied using the open aperture Z-scan technique in the nanosecond regime using a 532-nm wavelength laser . Results show that the composite has nonlinear optical properties that are much enhanced when composited with graphene oxide . All phenomena indicate that the film is a potential candidate for optical limiting applications.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yiying Yue,Huiming Luo,Jingquan Han,Yiliang Chen,Jianchun Jiang
The incorporation of renewable bio-based materials/eco-friendly inorganic nanofillers into stimuli-responsive hydrogels meets the need for biocompatible and non-toxic functional materials. However, it remains challenging to build a three-dimensional network with enhanced mechanical properties and desired stimuli-responsive performances. In this study, dual stimuli-responsive hydrogels with interpenetrating polymer network structure are fabricated by the crosslinking of N-isopropylacrylamide (NIPAM) 1 and sodium alginate (SA) 2 . 2,2,6,6-tetramethyl-piperidine-1-oxyl-oxidized cellulose nanofibers (TOCNF) 3 derived from energycane bagasse serves as a carrier material for nanosilicas (NS) 4 and nanoclays (NC) 5 and the effects of TOCNF , TOCNF/NS and TOCNF/NC on the hydrogels are thoroughly explored. Among these hydrogels, PNIPAM/SA-TOCNF-NS possesses the largest compressive strength of 66.7 kPa and it is 5.65 times higher than that of PNIPAM/SA. The thermo-sensitivity and pH-sensitivity of hydrogels are evidenced by swelling behaviors, optical properties, contact angle measurements and fluorescence tests. PNIPAM/SA-TOCNF exhibits the largest contact angle and the swelling processes for all the hydrogels are well fitted by pseudo-second-order swelling kinetic model. In addition, after incorporating carbon quantum dots, all the hydrogels display temperature dependent on–off fluorescence properties and this process are fully reversible with the heating and cooling cycles. These novel hydrogels with pH and temperature responsive characteristics and remarkable mechanical properties will open the door for interesting applications in smart sensors etc.
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高影响因子
FERROELECTRICS
·
2020
·
IF 0.669
Jie Liu,Lin Zhang,Meiyu Ci,Shuying Sui,Ping Zhu
The rheological behavior of regenerated cellulose/thermoplastic polyurethane (TPU) blend spinning solutions was investigated by an advanced rotary rheometer. The viscosity decreases with increasing shear rates, exhibiting shear thinning behavior. The storage modulus of G′ and the loss modulus G″ both increase with increasing frequencies, while the complex viscosity decreases gradually. The non-Newtonian index increases while the flow activation energy decreases with increasing TPU content. The composite fibers were characterized by FTIR and XRD, indicating that the addition of TPU into regenerated cellulose matrix destroyed the crystallinity to some extent. The mechanical property tests illustrate that the toughness of the fiber was greatly improved with the incorporation of TPU.
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BioEnergy Research
·
2024
·Vol. 17
·期 3
·1493-1502
·
IF 3.1
Jiao MeiZhen,Zhang Xinran,Wang Yiqin,Du Jian,Tao Yehan,Lv Yanna,Chen Ming,Lu Jie,Wang Haisong
Reed sawdust is a kind of paper mill waste with high cellulose and hemicellulose content. To promote the rational use of resources, it is essential to make full use of waste resources and transform them into new values. In this work, reed sawdust was pretreated with liquid hot water (LHW) at 170 °C for 30 min. A total of 39.00 g/L glucose was obtained after enzymatic saccharification of cellulose at 50 °C, 20 FPU/g- reed sawdust cellulase, 25% (w/v) reed sawdust, in 5 replenishments. When the fermentation was performed 96 h, the medium contained xylo-oligosaccharides (XOS) 11.74 g/L and biomass 15.21 g/L, in which lipid was 4.14 g/L. After spray drying, feed additives containing 29.17% XOS and 10.29% docosahexaenoic acid (DHA) can be prepared. In particular, the hemicellulose and cellulose in reed sawdust are creatively used at the same time without separation, which greatly reduces the cost of purification in traditional processes and provides a new way for the high-value transformation of sawdust resources.
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RSC Advances
·
2015
·Vol. 5
·期 100
·82027-82033
·
IF 3.84
Runjun Lin,Ang Li,Tingting Zheng,Lingbin Lu,Yang Cao
Adsorbent materials as well as hydrophobic modification methods have been at the forefront of research creating environmentally hazardous waste. Herein, we report a facile, green preparation method for cellulose aerogels. Cold plasma technology was employed for hydrophobic modification of the aerogel surface using trimethyl-chlorosilane (TMCS) as the plasma. Notably, the modification procedure was considerably more rapid (less than 3 min), more efficient and economically viable than traditional methods. The highly flexible modified cellulose aerogels are hydrophobic (ca. 150°), oleophilic and ultralight (as low as 0.0196 g cm−3). Compared to conventional oil adsorbent materials, these low-cost, environment-friendly cellulose aerogels exhibit excellent adsorption properties (peanut oil, 34.5 g g−1) as well as remarkable reusability (more than 15 times). Therefore, the preset work would play a significant role in further advancing the fields of adsorbent materials and hydrophobic modification methods.
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高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Xiaohui Ni,Wanli Cheng,Siqi Huan,Dong Wang,Guangping Han
An electrospinning process was utilized to fabricate composite nanofibers of poly(methyl methacrylate) (PMMA) reinforced with cellulose nanocrystals (CNCs). The effect of environmental relative humidity on the microstructure of CNC/PMMA nanofibers was investigated. Results showed that fiber surfaces of CNC/PMMA appeared smooth. Fibers had gradually decreasing diameters and lower diameter variations as CNC loading increased. The thermal property of CNC/PMMA nanofibers was also enhanced due to hydrogen bonding between PMMA molecular chains and CNC nanoparticles. Compared to pure PMMA fibers, the storage modulus and tensile strength of composite nanofibers were pronouncedly improved. By increasing relative humidity of the electrospinning environment, these nanofibers showed prominent nanoporous surfaces while the surface roughness and porosity of CNC/PMMA nanofibers increased. Furthermore, CNCs were critical to accelerating the evolution of pores and increasing surface roughness. Our findings can provide useful guidelines for the fabrication of nanofibers with desired properties and pore structure by electrospinning.
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高影响因子
RSC Advances
·
2025
·Vol. 15
·期 18
·14235-14245
·
IF 4.6
Tong Su,Daguo Wu,Xinghua Zhang,Qi Zhang,Lungang Chen,Xiuzheng Zhuang,Longlong Ma
Biomass is an important renewable resource in nature, and cellulose is a crucial component within it. The chemically directed conversion of cellulose into ethylene glycol offers a green alternative to traditional petroleum-based production methods. In this study, a multifunctional Ni–WOx/SAPO-11 catalyst was designed. By optimizing the processing parameters of catalysts and the reaction conditions of them, it was demonstrated that this catalyst could efficiently catalyze cellulose into alcohol products through a series of tandem reactions such as hydrolysis, retro-aldol condensation, and hydrogenation under relatively mild conditions. The yield of ethylene glycol climbed from 4% (at 180 °C) to 66.6% (at 240 °C) with the increase of reaction temperature. Characterization (XPS, TEM, TPD/TPR) revealed that a reduction temperature of 500 °C maximized Brønsted acidity and W5+/W6+ ratios, enhancing C–C cleavage efficiency. Further increases in the reduction temperature would weaken the Brønsted acid on the surface of SAPO-11, but its surface area would also increase (mainly in the form of mesopores). The uniformly dispersed elemental tungsten could form new acidic sites on the catalyst surface; in combination with active Ni0, this high-temperature reduced catalyst could achieve the direct hydrogenolysis of cellulose to produce ethylene glycol, benefiting the efficient utilization of lignocellulosic biomass in the future.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kewei Shu,Wenjuan Li,Yi Zhang,Yan Zong,Huilan Li,Yu Wang,Zixiong Sun
Flexible, miniature, and lightweight supercapacitor is ideal power source for next-generation portable and wearable electronics. However, their widespread application is limited by a critical drawback, self-discharge, which leads to energy loss during idle periods. To this end, a polyvinylidene fluoride (PVDF)-based nanofiber separator with piezoelectric properties that can effectively suppress self-discharge in supercapacitors, was prepared via electrospinning. By incorporating hydrophilic cellulose acetate (CA) and reduced graphene oxide (rGO) into the PVDF matrix, both the electrolyte affinity and piezoelectric output of the separator are significantly enhanced. The resulting rGO/CA/PVDF composite membrane exhibits outstanding mechanical flexibility, high porosity, excellent electrolyte uptake, making it highly suitable separator for flexible supercapacitor. Supercapacitors equipped with such separator exhibit superior electrochemical performance with a specific capacitance of 178.2 F/g at 10 A/g. Notably, an impressive capacitance retention of 79 % was achieved after 24 h of self-discharge test. The reduction in self-discharge is primarily due to the limited diffusion of electrolyte ions, induced by the polarized rGO/CA/PVDF composite separator endowed with improved piezoelectric characteristics. This work highlights the potential of piezoelectric separators as an effective strategy for long-term energy retention, and offers new insights into the rational design of functional separators with self-discharge mitigation capabilities.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yichun Zhang,Tianqi Wei,Xin Zhong,Zhiguang Guo
In recent years, water pollution caused by oily wastewater discharged from industrial production has become increasingly serious. There was an urgent need for a simple, efficient, and environmentally friendly method to treat oily wastewater, so as to reduce and solve the water pollution problem. In this study, a layer of cellulose hydrogel was coated on stainless steel mesh (SSM) by a dipping coating method, and nanozeolitic imidazolate framework-8 (ZIF-8) particles were grown in situ using the hydrogel as the matrix. The surface roughness of cellulose@ZIF-8@SSM was improved, and its hydration ability was enhanced. The prepared superhydrophilic-underwater superoleophobic cellulose@ZIF-8@SSM can separate different oil/water mixtures under gravity and has long-term separation ability. What is more, the oil–water separation efficiency was more than 99.997%. In addition, cellulose@ZIF-8@SSM showed good chemical and mechanical stability in acid and alkali solution immersion and sand impact tests. This work has broad application prospects and potential in the field of treating oily wastewater.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Ling Zhou,Ao Chen,Zhenzhen Liu,Chong Tao,Jing Ding,Jieru Guo,Hao Wu,Weiyi Zhou,Xipo Zhao
Long-term protection of skin-defect wounds is challenging for the common wound dressings cotton gauze due to its weak skin adhesion, limited drug-loading capacity and frequent replacement. Hydrogels are considered as the promising wound dressings benefiting by their good mechanical compatibility and biocompatibility. Nevertheless, the hydrogels always suffer from the drawbacks of fast water evaporation, lack of antibacterial ability and uncontrollable drug release, which greatly shorten their long-term wound protection duration. Herein, a novel and multifunctional phase change gel (PCG) combining flexibility of hydrogel and release-controllable ability of phase change materials (PCMs) was fabricated through a facile solvent-exchange strategy. Specifically, the bacterial cellulose (BC)/polyethylene glycol based phase change gels (BC/PEG PCGs) were prepared by direct impregnation of BC hydrogel into massive PEG melts. The solvent-exchange mechanism between BC hydrogel and PCM melts was firstly studied based on the impregnation experiments of BC gels into various PCMs. The as-prepared BC/PEG PCGs were then characterized in terms of structure, mechanical, phase change and wound dressing properties, subsequently. This work provides a comprehensive understanding of the structure relationship on their excellent flexibility, good adhesive, skin-cooling, antibacterial and controllable drug-release functions of BC/PEG PCGs, extending their potential in the long-term protection of skin-defect wounds.
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DOI
PubMed
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 10
·751
·
IF 4.3
Jian Li,Laizhi Sun,Derun Hua,Xinning Lu,Dandan Yang,Zhiying Wu
Gallium-modified Zeolite Socony Mobil-5 (ZSM-5) zeolites were synthesized using wetness impregnation and hydrothermal synthesis methods. The structural and acidic properties of the zeolites were characterized through an analytical instrument, which demonstrated that Gallium-modified HZSM-5 zeolites retain the Mobil five instructure (MFI) framework structure, but exhibit a reduction in Brønsted acid sites and a decrease in micropore size. The catalytic performance of these zeolites in the pyrolysis of cellulose biomass and polyethylene was tested. Compared with HZSM-5, Ga-modified HZSM-5 zeolites considerably increased monoaromatic yields while reducing alkanes production. In particular, gallium-impregnated HZSM-5 increased the monoaromatic yield from 37.6% for ZSM-5 to 43.2%, while hydrothermal synthesized Ga-HMFI reduced polyaromatic and alkane yields from 6.6% and 24.6% for HZSM-5 to 2.9% and 11.4%, respectively. These results indicated that Ga-modified HZSM-5 zeolites can improve the synergy between cellulose-derived oxygenates and polyethylene-derived olefins, enhancing the yield of petrochemical hydrocarbons compared to that predicted by theoretical calculations.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）