POLYMER COMPOSITES
·
2024
·
IF 4.8
Peixing Li,Haoze Yuan,Xinyu Wang,Cheng Yu,Xin Wang,Jutao Sun
The crystalline cellulose has captured much attention as reinforcement material in rubber composites, but no successful cases have been found till now. Here, a facile approach of cellulose utilization was proposed by in-situ regenerating cellulose in dry rubber matrix. Cellulose was dissolved in ionic liquid (IL), and then directly mixed with dry rubber, silica, and other ingredients. Taking advantages of the strong interaction between IL and silica, the dissolution equilibrium of cellulose/IL was destroyed and resulted in the regeneration of cellulose crystals in rubber matrix. The regenerated cellulose appeared at dry blending stage, and showed an ideal rod-like shape (10–100 nm in diameter and 200–500 nm in length). While it grew in size at curing stage, and finally reached 100–200 nm in diameter and 1–2 μm in length. The regenerated cellulose exhibited pronounced reinforcement efficiency. This methodology has no any waste liquid discharged, and has a promising use in the preparation of cellulose/rubber composites. Highlights Nanosized rod-like cellulose was regenerated in dry rubber, instead of latex. Regeneration of cellulose was due to interaction between ionic liquid and silica. The in situ regenerated cellulose dispersed well in cured rubber compounds. The regenerated cellulose exhibited a good reinforcement efficiency in rubber. The whole machining process had no any waste liquid discharged.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2015
·
IF 3.476
Guizhuan Xu,Chun Chang,Shuqi Fang,Xiaojian Ma
Cellulose reactivity in ethanol at elevated temperature (170–210 °C) was investigated in this study. Water and acid catalyst can improve the solubilization and the conversion of cellulose in ethanol. In ethanol/water medium, more humic solids will be formed, but the amounts of diethyl ether decreased greatly. In ethanol medium, the ethanolysis reaction of cellulose played a dominant role, with ethyl levulinate (EL) as the main liquid product. In addition, organic esters and furan derivatives were the main small molecules in the liquid, and diethoxymethane and diethyl sulfate were considered as the main liquid by-products. On the basis, the kinetics of one-pot preparation of EL from cellulose was further investigated at a temperature range of 170–210 °C and an acid concentration range of 0.5–2.0 wt%. Artificial Neural Network (ANN) was employed to develop an approach for the evaluation of the process. A good agreement of the ANN model results and the experimental data was obtained, and the optimum reaction conditions for one-pot preparation of EL were temperature 188 °C, reaction time 30 min, acid concentration 1.2 wt%. Under the conditions, higher EL yield can be obtained, which was close to the ANN model result.
研究领域:
化学工程
·
生物化学
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2017
·
IF 4.747
Huiqiong Yan,Xiuqiong Chen,Huangwang Song,Jiacheng Li,Yuhong Feng,Zaifeng Shi,Xianghui Wang,Qiang Lin
Although bacterial cellulose (BC) and bacterial cellulose nanocrystals (BCNs) have considered to be edible, non-toxic, biocompatible and biodegradable, there is still the dearth of reports of BC and BCNs as the emulsifiers of Pickering emulsions with respect to the applications in foods , cosmetics and medicines. In this work, BC with ultrafine network architecture and 8–40 nm crystalline microfibrils in diameter was produced by Acetobacter xylinum , and then it was hydrolyzed by sulfuric acid followed by the oxidation of hydrogen peroxide to prepare BCNs. The physicochemical properties of BC and BCNs were contrastively evaluated by FT-IR, XRD, TGA and dynamic light scattering (DLS). The emulsifying performances of BC and BCNs in the stabilization of olive oil Pickering emulsion were further evaluated by optical microscope (OM) and fluorescent microscope (FM). Experimental results showed that the sulfuric acid hydrolysis of BC induced the removal of the amorphous components and the cleavage of the crystalline microfibrils, making BCNs possess the initiating decomposition temperature of 350 °C, the crystallinity index (CrI) of 89.6%, average size of 259.6 nm with PDI of 0.26 and zeta potential at about −34.8 mV, which exhibited high thermal stability and good emulsifying performance in comparison with BC. Furthermore, the effects of pH and ionic strength on emulsion stability were also investigated. In comparison to BC, BCNs were more sensitive in response to the change of pH and ionic strength.
研究领域:
食品科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Xiaogeng Lin,Yasan He,Yuting Zhang,Wanyin Yu,Tao Lian
The comparably low performance hinders the application of CTA based forward osmosis (FO) membranes. Herein, sulfonated-COFs incorporated CTA/CA membranes were designed to enhance the FO performance, taking advantages of the sulfonated COFs with high hydrophilicity, size exclusion and electrostatic repulsion to salt. Two COFs with different pore size were synthesized and sulfonated to prepare hydrophilic COF-SO 3 H. The COF-SO 3 H with different loading was then added into CTA/CA casting solution to fabricate incorporated membranes. Characterizations and FO tests revealed that an appropriate amount of COF-SO 3 H in the membrane matrix could increase membrane porosity, reduce structural parameter (S), bring more negative charges and improve hydrophilicity, leading to enhanced permeability, higher selectivity and suppressed internal concentration polarization. One of the synthesized COF-SO 3 H, named TATP-SO 3 H, had a pore size of 0.84 nm, ideal for both easy passthrough of water and high rejection to salt. The XPS results verified the existence of H-bonding between TATP-SO 3 H and CTA/CA. The membrane with 0.2 wt% TATP-SO 3 H loading had the best porosity and S, and achieved high flux (13.34 LMH) and selectivity ( J w /J s 6.26 L/g) in FO mode, both of which were 2–3 times of those of the neat CTA/CA membrane and the unfunctionalized-COFs incorporated membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 15
·10204-10214
·
IF 3.9
Meilin Li,Bei Jiang,Shuoang Cao,Xinyi Song,Yuanqiao Zhang,Lijun Huang,Quanping Yuan
High-performance flexible barium titanate (BaTiO3)-based piezoelectric devices have gained much attention. However, it is still a challenge to prepare flexible polymer/BaTiO3-based composite materials with uniform distribution and high performance due to the high viscosity of polymers. In this study, novel hybrid BaTiO3 particles were synthesized with assistance of TEMPO-oxidized cellulose nanofibrils (CNFs) via a low-temperature hydrothermal method and explored for their application in piezoelectric composites. Specifically, Ba2+ was adsorbed on uniformly dispersed CNFs with a large amount of negative charge on their surface, which nucleated, resulting in the synthesis of evenly dispersed CNF-BaTiO3. The obtained CNF-BaTiO3 possessed a uniform particle size, few impurities, high crystallinity and dispersity, high compatibility with the polymer substrate and surface activity due to the existence of CNFs. Subsequently, both polyvinylidene fluoride (PVDF) and TEMPO-oxidized CNFs were employed as piezoelectric substrates for the fabrication of a CNF/PVDF/CNF-BaTiO3 composite membrane with a compact structure, displaying the tensile strength of 18.61 ± 3.75 MPa and elongation at break of 3.06 ± 1.33%. Finally, a thin piezoelectric generator (PEG) was assembled, which output a considerable open-circuit voltage (4.4 V) and short-circuit current (200 nA), and could also power a light-emitting diode and charge a 1 μF capacitor to 3.66 V in 500 s. Its longitudinal piezoelectric constant (d33) was 5.25 ± 1.04 pC N−1 even with a small thickness. It also exhibited high sensitivity to human movement, outputting a voltage of about 9 V and current of 739 nA for only a footstep. Thus, it exhibited good sensing property and energy harvesting property, presenting practical application prospects. This work provides a new idea for the preparation of hybrid BaTiO3 and cellulose-based piezoelectric composite materials.
研究领域:
材料科学
·
能源工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 10
·8922
·
IF 5.6
Fuchao Li,Zhemin Xie,Jianfeng Wen,Tao Tang,Li Jiang,Guanghui Hu,Ming Li
In this study, sugarcane bagasse (SCB) was treated with sodium hydroxide and bleached to separate the non-cellulose components to obtain cellulose (CE) fibres. Cross-linked cellulose–poly(sodium acrylic acid) hydrogel (CE–PAANa) was successfully synthesised via simple free-radical graft-polymerisation to remove heavy metal ions. The structure and morphology of the hydrogel display an open interconnected porous structure on the surface of the hydrogel. Various factors influencing batch adsorption capacity, including pH, contact time, and solution concentration, were investigated. The results showed that the adsorption kinetics were in good agreement with the pseudo-second-order kinetic model and that the adsorption isotherms followed the Langmuir model. The maximum adsorption capacities calculated by the Langmuir model are 106.3, 333.3, and 163.9 mg/g for Cu(II), Pb(II), and Cd(II), respectively. Furthermore, X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectrometry (EDS) results demonstrated that cationic exchange and electrostatic interaction were the main heavy metal ions adsorption mechanisms. These results demonstrate that CE–PAANa graft copolymer sorbents from cellulose-rich SCB can potentially be used for the removal of heavy metal ions.Keywords:cellulose;modified cellulose hydrogels;heavy metal ions;graft copolymer;sugarcane bagasse
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jing Zhou,Muqiu You,Jinhao Xu,Yongcan Jin,Dagang Li,Zhaoyang Xu,Chuchu Chen
The concerning accumulation of nonbiodegradable plastic films in the environment and the associated risks have prompted a vigorous quest for biobased degradable substitutes. However, creating biomass-based plastics with a combination of high mechanical strength, water resistance, and rapid degradation in a natural environment presents a great challenge. Herein, we report a facile method to develop high-performance all-cellulose bioplastics from waste wood particles by low-energy microfibrillation and simple oxidation. The resulting oxidized all-cellulose microfiber films (OCMFs) containing a densely packed microscale fiber network structure simultaneously achieve high light transmittance (≈85.1%), low haze (≈6%), and notably high wet strength (≈32.34 MPa), superior to those of typical cellulose nanofiber films with inherent high hydrophilicity. Moreover, the thickness of OCMF can be easily regulated via a self-adhesive lamination approach, overcoming the limited film thickness formed by vacuum filtration. Coupled with low-valuable waste raw materials, all-cellulose components, low-energy microscale fabrication, and high optical clarity and water resistance, the proposed OCMF proves its bright future as ecofriendly alternative bioplastics in sustainable materials.
研究领域:
材料科学
·
环境科学
·
生物质工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chang-Lian Xu,Chongfeng Yuan,Zelong Yang,Xiaoxun Xu,Guiyin Wang,Zhanbiao Yang,Zhang Cheng,Shirong Zhang,Ting Li,Guochun Lv,Junzhuo Cai,Xin Qi
Energy consumption from air cooling systems in summer, water scarcity in hot regions, and the functional reusability of waste paper are emerging environmental problems. Finding solutions to these problems simultaneously remains a significant challenge. Herein, a superhydrophobic passive cooling Cellulose-CaCO 3 film with hierarchical nano-sheets was fabricated to realize daytime radiative cooling with a temperature drop of 15–20 °C in summer and water harvesting with harvesting efficiency of 387 mg cm −2 h −1 bd utilization of recycled waste paper. The superhydrophobic Cellulose-CaCO 3 film demonstrates its self-cleaning properties against inorganic and organic pollutants . Furthermore, the superhydrophobicity of the film was maintained after base/acid corrosions, dynamic water flushing, and thermal treatment at 100 °C for 7 h, exhibiting good durability of the superhydrophobicity. Moreover, the superhydrophobic Cellulose-CaCO 3 film is nonflammable after exposure to fire combustion for 1 min. In addition to waste paper, waste maize straws, and pasteboards were also collected to produce superhydrophobic passive cooling films. Results indicate that the above three cellulose-based raw materials can be well used to prepare durable superhydrophobic passive cooling materials. Environmental toxicology assessments confirm the safety of the material. This study not only provides a protocol for preparing superhydrophobic materials; but also demonstrates their potential for passive cooling and water harvesting.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2026
·Vol. 31
·期 2
·387
·
IF 4.6
Meng He,Yanmei Lin,Yujia Huang,Xiuxing Ma,Yuanqiang Guo,Yuliang Ke,Huazhen Lai,Zhaopeng Wang,Zhanhua Chen,Xiaofang Zhang,Hangyu Dai,Mengna Feng,Yunhui Fang,Xiaopeng Xiong
Carboxymethyl hydroxypropyl cellulose (CMHPC) combines the advantages of both carboxymethyl and hydroxypropyl substitutions, exhibiting superior solubility, viscosity characteristics, and enhanced salt tolerance compared to carboxymethyl cellulose (CMC). This study presents an optimized synthesis route for CMHPC through homogeneous hydroxypropylation of CMC under alkaline conditions. The effects of key reaction parameters, including propylene oxide amount and reaction time, on the structure and resulting properties were systematically investigated. The resulting CMHPC were comprehensively characterized using FTIR, solid state13C NMR, and scanning electron microscopy (SEM), etc., confirming the successful hydroxypropyl group incorporation and morphological changes. In our findings, the suitable concentrations for NaOH and CMC were 5% and 4%, respectively, which could balance the yield and solution fluidity. CMHPC exhibited a much faster dissolution speed (3–5 min) than that of CMC (>30 min), indicating markedly enhanced hydrophilicity and solubility. Moreover, CMHPC also exhibited improved salt and acidity tolerance due to the steric hindrance of hydroxypropyl groups. CMHPC was also used to modify recycled coarse aggregate (RCA), and the results indicated that CMHPC could enhance the surface compactness and structural integrity of RCA. Moreover, CMHPC effectively improved the water resistance of RCA by constructing a physical barrier and optimizing the pore structure of the aggregate. This research provides valuable insights into the fabrication of modified cellulose ethers in homogeneous systems and offers a practical pathway for producing high-value cellulose derivatives with tailored properties, particularly for potential construction applications.
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 41
·17865-17871
·
IF 2.7
Long Yang,Simei Zhang,Zemei Hu,Jing Li,Guangyin Xie
Hydrogels are regarded as ideal tissue scaffold materials owing to their unique advantages, but problems such as low strength and easy cracking have become bottlenecks that limit their practical applicability. Constructing reinforced hydrogels is a widely studied approach for performance enhancement. Therefore, herein, cellulose nanocrystals were introduced as reinforcement into a thermally responsive hydrogel matrix through a Schiff base, achieving a cellulose nanocrystal-reinforced thermally responsive dynamic hydrogel. The CNC-reinforced hydrogel was characterized in detail, and the influence of CNCs on hydrogel properties was systematically investigated. Moreover, the thermally responsive and dynamic properties of the resulting hydrogels were tested to evaluate their mechanical performance. This work provides a feasible solution for the design of hydrogel-based tissue scaffold materials with long service life.
研究领域:
生物材料学
·
高分子化学
·
再生医学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Hui Dong,Qijun Ding,Yifei Jiang,Xia Li,Wenjia Han
Nano cellulose has attracted more attentions as promising stabilizer candidate for Pickering emulsions due to its renewable and biocompatible properties. In this work, spherical cellulose nanocrystals (S-CNCs) (diameter 30–60 nm) were prepared by mixed acid hydrolysis of mercerized microcrystalline cellulose under the treatment of ultrasonic. We characterized the Pickering emulsions stabilized by various S-CNCs concentration in the aqueous phase and visualized their distribution in emulsions system. The diameter of emulsion droplets has no increase after 7 days storage. The emulsions present ultra-low viscosity even at a high S-CNCs concentration in the aqueous phase (5 g/L). Furthermore, noting that Pickering emulsions droplets stabilized by S-CNCs exhibited high stability even pH, ionic strengths , and temperatures changed in wide range. Thus, the S-CNCs acted as a new stabilizer for Pickering emulsion open opportunities for the development of biomedicine , cosmetics, and food applications.
研究领域:
材料科学
·
纳米技术
·
胶体科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2011
·
IF 3.463
Zhenhua Yang,Shiyan Chen,Weili Hu,Na Yin,Wen Zhang,Cao Xiang,Huaping Wang
Flexible luminescent membranes based on bacterial cellulose (BC) were successfully fabricated by the in situ synthesis of the CdSe nanoparticles on the BC nanofibers. X-ray diffraction (XRD) patterns and field emission scanning electron microscopy (FE-SEM) revealed that CdSe nanoparticles were homogeneously dispersed on the BC nanofibers. The thermal stability of BC was greatly increased with the inclusion of CdSe nanoparticles. The CdSe/BC nanocomposite exhibited good photoluminescence properties and excellent mechanical properties. This work provides an effective method for the construction of flexible BC membranes with photoluminescence properties, which are promising for applications in the fields of security papers, sensors and flexible luminescent membranes.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 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）