ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 31
·2201081
·
IF 19.924
Qiqi Mao,Kai Deng,Hongjie Yu,You Xu,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
Designing efficient and durable electrocatalysts for seawater electrolysis shows a great research prospect, but it remains a significant challenge. Herein, we report the partially hydroxylated Rh metallene (Rh/RhOOH metallene) with porous, ultrathin, defect-rich and hetero-phase structure for ethylene glycol (EG)-assisted seawater electrolysis. In parallel, the unique redox effect of RhOOH species and EG as well as the electroreduction effect riggers the in situ reconstruction for the catalyst during electrocatalysis, which further produces active Rh species to optimize the catalytic activity center and surface catalytic reaction. Benefiting from the unique metallene structure and the Rh/RhOOH heterogeneous structure, the Rh/RhOOH metallene exhibits superior electrocatalytic performance towards hydrogen evolution reaction (HER, overpotential of 29 mV) and EG oxidation reaction (EGOR, specific activity of 1.051 mA cm –2 ). Encouragingly, in the constructed EG-assisted seawater electrolysis system, the Rh/RhOOH metallene only needs a low cell voltage of 0.678 V to achieve a current density of 10 mA cm –2 for energy-saving H 2 production, which significantly reduces energy consumption compared to conventional seawater electrolysis.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 10
·2602-2612
·
IF 6.813
Haosheng Xin,Haiyong Wang,Song Li,Xiaohong Hu,Chenguang Wang,Longlong Ma,Qiying Liu
Catalytic conversion of renewable cellulose, instead of fossil resources, to high-value ethylene glycol (EG) is of great significance for reducing considerable worries regarding the energy problem. However, the EG production from cellulose is dependent on Ni and Ru based catalysts. Herein, encapsulated Co@C catalyst was firstly applied for EG production from cellulose combined with tungstic acid (TA). The mixing of the two catalysts in different ratios was compared and well-controlled, and the highest 67.3% yield of EG can be achieved. TA is used mainly to promote both the cellulose hydrolysis and the retro-aldol reaction of glucose to glycolaldehyde. Co@C catalysts are responsible for the hydrogenation of glycolaldehyde to EG. Compared with traditional noble metals and composite catalysts, the inexpensive and easily synthesized Co@C catalysts could greatly reduce the cost of production of EG. The Co@C catalysts encapsulated with outside graphene layers can keep high stability for at least 6 runs.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Jiabing Cai,Yunqing He,Youquan Zhou,Hongbo Yu,Binghong Luo,Mingxian Liu
Ionic conductive hydrogels with advantageous mechanical properties and high stretchability attract much attentions in wearable electronic devices. Here, a freezing-tolerant hydrogel with high stretchability (435%), strength (2.0 MPa), and ionic conductivity had been prepared by freezing/thawing of polyvinyl alcohol (PVA) and polyethylene glycol functionalized chitin nanocrystals (PEG-g-ChNCs) in dimethyl sulfoxide-water solvent. The successful grafting of PEG on ChNCs was confirmed by various characterization methods. The organohydrogel reinforced by PEG-g-ChNCs displayed excellent freezing-tolerance without rupture during extension, which remains conductivity (0.01 S/m) even at −20 °C. PVA/PEG-g-ChNCs organohydrogel was employed as strain sensor. Interestingly, the sensors based on this organohydrogel presented high stretching sensitivity with a gauge factor of 2.3, and it could be repeatedly and stably monitor tiny strain under extension and pressure. Therefore, the ionic conductive organohydrogel sensor based PEG-g-ChNCs enhanced PVA have promising applications in wearable devices , such as sports monitoring or healthcare monitoring.
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INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Li Wang,Jun Xiang,Songhang Wang,Zhe Sun,Jiating Wen,Jing Li,Zhong Zheng,Haojun Fan
Oleic acid , as a renewable resource, exists in almost every vegetable oil, especially olive and camellia oils, which has promising prospects for the preparation of bio-based polymers. In this study, a novel oleic-based primary glycol (OPG) was synthesized from methyl oleate (MO, derived from vegetable oil) via Claisen condensation and thiol-ene photo-click reactions and used as an alternative to petroleum-based glycol for the preparation of bio-based waterborne polyurethane (BWPU), and the differences in reactivity between the OPG and petroleum-based polypropylene glycol (PPG) and properties between BWPU and petroleum-based waterborne polyurethane (PWPU) were investigated. The yield of OPG was approximately 90%, the degree of functionality was 2.0, the hydroxyl value was about 155 mg KOH g −1 and the molecular weight (M w ) varied from 296 g mol −1 to 560 g mol −1 and 716 g mol −1 after the chain extension of Claisen condensation and thiol-ene photo-click reactions. In comparison with PPG, OPG exhibited lower activation energy towards IPDI, and the values showed an order of OPG ( E a / E o =71.25/74.20 kJ mol −1 ) < PPG600 ( E a / E o =106.83/108.03 kJ mol −1 ) < PPG1000 ( E a / E o =129.20/129.37 kJ mol −1 ). Correspondingly, the end point of pre-polymerization appeared in 80 min for OPG and 420 min, 840 min for PPG600 and PPG1000 at 80 °C without catalyst, demonstrating that OPG had higher reactivity. Because of the difference in hydrophobicity, the minimum amount of hydrophilic extender used to obtain stable WPU emulsions was 7 wt% for OPG and 3.5 wt% for PPG respectively. The resulting BWPU films possessed good mechanical properties, including higher tensile strength (19.78 MPa) and Young’s modulus (206.61 MPa). But the thermal stability (T d5% ≤ 250 ℃) and low temperature resistance (T g ≥ 28 ℃) of BWPU films were inferior to that of PWPU films.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 10
·2108000
·
IF 18.808
Junshuo Cui,Wenkang Li,Yuejiao Wang,Haibiao Yu,Xiaogeng Feng,Zhenning Lou,Weijun Shan,Ying Xiong
Form-stable phase change materials (PCMs) have great potential to regulate the unbalanced heat demand and supply, yet most of the PCMs are in powder, plate, or bulk rigid forms, difficult to adhere to the heat source or target substrates. Herein, PCMs coatings based on reactive poly(ethylene glycol) (RPEG) are developed for direct thermal energy exchange and storage. RPEG with highly reactive silanol groups is obtained by reaction of PEG with 3-isocyanatopropyltriethoxysilane (IPTS), followed by hydrolyzation in weak acid. Cross-linked PCMs coatings are obtained on various substrates, including cotton fabric, wood, tinplate, and even irregular objects. The coatings show obvious solid-solid phase transition properties and high energy storage densities (142.8 J g −1 ). Multi-walled carbon nanotubes (MWCNTs) are further doped into the coatings aided by a self-cross-linkable dispersant. The composite coatings exhibit excellent high-temperature form stability and rapid thermal exchange properties owing to the formation of the cross-linked network between RPEG and MWCNTs. Thermal regulation clothes are prepared by a spray coating method, which show no performance deterioration after washing three times, indicating good washing durability.
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MOLECULES
·
2023
·Vol. 29
·期 1
·66
·
IF 4.6
Meng Zhang,Xue Zhuang,Siqi Li,Yansong Wang,Xiangyu Zhang,Jinlian Li,Dongmei Wu
Binary ethosome vesicles have been developed as flexible lipid vesicles for the enhanced physicochemical stability and skin delivery of drugs. This work aimed to prepare phloretin-loaded propylene glycol ethosomes (PHL-PGEs) to improve their stability, skin permeability and antioxidant activity. PHL-PGEs were prepared via the ethanol injection method and optimized using different weight ratios of ethanol to propylene glycol (PG). When the ethanol/PG mass ratio changed from 10:0 to 0:10, the encapsulation efficiency and stability of ethosomes increased. At a PHL concentration of 1mg/mL, the EE% was 89.42 ± 2.42 and the DL% was 4.21 ± 0.04, which exhibited their highest values. The encapsulation of the PHL in the PHL-PGEs was strengthened via XRD analysis and FTIR analysis. The results of the in vitro percutaneous permeability test demonstrated that the combined use of ethanol and PG exhibited a notable enhancement in skin permeability, and the skin retention of PHL-PGEs was 1.06 times that of PHL-ethosomes (PHL-Es) and 2.24 times that of the PHL solution. An in vitro antioxidant activity study indicated that solubility and antioxidant activity was potentiated via the nanoencapsulation of phloretin. Therefore, these results confirm the potential of this nanocarrier to enhance physicochemical stability, skin permeability and antioxidant activity.Keywords:binary ethosomes;propylene glycol;skin permeability;antioxidant activity
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2018
·
IF 3.997
Miao Zhao,Ying Chen,Rongcheng Han,Dan Luo,Libo Du,Qiang Zheng,Lijun Wang,Yuankai Hong,Yang Liu,Yinlin Sha
We here report a facile synthesis of chitosan shelled quantum dot (QD/fGC) that holds essential properties requisite for biological applications, such as excellent water solubility, super colloidal stability, and low nonspecific adsorption as well as ease of functionalization. In this method, the amphiphilic glycol chitosan fragment (MW 1.0–1.7 kDa) was assembled on the top of CdSeS/ZnS nanocrystal through hydrophobic interaction in aqueous solution, without displacing the native coordinating ligands, which result in a higher quantum yield of about 0.26, 46% of the uncoated CdSeS/ZnS QDs in chloroform (0.57). In addition, the prepared QD/fGC composes an individual semiconductor core and presents an extremely small size of about 6.03 ± 1.50 nm (n = 399) in diameter. By conjugation with bioactive amines via 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC)-based hydroxyl activation approach, the functionalized QD/fGC presented excellent recognition of specific cells in fluorescent imaging. Our work provides a new general method of chitosan modification of hydrophobic nanoparticles for biomedical applications.
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POLYMER COMPOSITES
·
2023
·Vol. 45
·期 2
·1524-1533
·
IF 5.2
Xi Guo,He Jiang,Chendong Qiu,Tonghua Lu,Renzhong Wei,Mizi Fan,Yi Zhang,Weisheng Sun
Phase-change material (PCM) has great thermal energy ability, which has been used as building material for energy conservation. While the most widely used solid–liquid PCM usually appeared leakage during the phase change transition. In order to overcome the leakage of solid–liquid PCM and prepare a viable building energy-saving materials for indoor temperature regulation, thermal energy storage composites were prepared by utilizing cellulose grafted PEG as phase change material (PCM) and high-density polyethylene (HDPE) as the substrate. The liquid leakage of PEG was solved after graft to fabricate solid–solid PCM. HDPE is beneficial for solving the leakage and improving the mechanical property by its secondary encapsulation. The synthesized Cellulose-PEG was characterized by scanning electron microscopy (SEM), X-ray diffractometer (XRD), and differential scanning calorimetry (DSC). Thermal and mechanical characteristics of the composite were explored. The outcomes revealed that: (1) PEG was successfully grafted to the surface of cellulose and Cellulose-PEG showed solid–solid phase change behavior. (2) Both the melting-cooling temperatures and the thermal stability of solid–solid wood plastic composite (SSWPC) had the potential as thermal energy storage material for temperature regulating. (3) The addition of Cellulose-PEG adversely affected moisture resistance, flexural property, and impact strength due to the weak interface bonding. The physical and mechanical degradation was tolerable for applying situation where mechanical performance is less crucial. Highlights Cellulose-PEG showed solid–solid phase change behavior without liquid leakage. High-density polyethylene (HDPE) was used as the matrix to realize the second encapsulation of PCM. Cellulose-PEG negatively influenced the physical and mechanical property of HDPE. Solid–solid wood plastic composite presented great thermal storage capacity for indoor temperature regulating.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Li Bai,Mei Wu,Huazhong Yu,Shima Liu,Ke Song,Xianwu Zhou,Jie Guo,Jian He
Acetalization is a promising method for upgrading biomass-derived molecules into valuable chemicals, and acetal products are considered excellent oxygenated fuel additives. Herein, a catalyst-free, facile, and effective protocol for the acetalization of furfural and ethylene glycol is established, affording a 78.6% yield of 2-(furan-2-yl)-1,3-dioxolane with a furfural/ethylene glycol molar ratio of 1:15 in cyclohexane at 160 °C after 2 h. Moreover, the lower activation energy (15.8 kJ/mol) corroborates that the established system is efficient, and the thermodynamic studies demonstrate that catalyst-free acetalization is an endothermic, nonspontaneous, and endergonic reaction. A plausible mechanism including two pathways for catalyst-free acetalization of furfural and ethylene glycol is proposed, wherein the formed water from the acetalization process can render the ethylene glycol to be hydrolyzed, which plays a positive role in facilitating the acetalization of furfural and ethylene glycol. In addition, the excess ethylene glycol in the reaction mixture can be easily recovered and almost shows the same activity as fresh ethylene glycol in catalyst-free acetalization. Furthermore, the established catalyst-free protocol is viable for various biobased furanic compounds and alcohols, enabling broad access to various acetals. Finally, catalyst-free acetalization of furfural and ethylene glycol can be magnified to 10 times, showing the promising potential of large-scale production.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Weiyang Shen,Yongxin Wang,Yali Li,Zongyao Cui,Yitong Yang,Honglu Shi,Chenfeng Xu,Tingjie Yin
Bacterial infections would cause pathological inflammation and even generate chronic wound. Herein, a ciprofloxacin (Cip)-loaded mild acid-responsive electrospinning nanofiber membrane (NFM) containing 3-diethylaminopropyl isothiocyanate material grafted glycol chitosan (GC-DEAP) was fabricated to prevent bacterial infection against hemostatic and inflammatory phases of wounds. The presence of Cip and GC-DEAP in the objective NFM (PCL/GC-DEAP/Cip) was confirmed through XRD and FTIR. Meanwhile, PCL/GC-DEAP/Cip NFM exhibited high mechanical profiles, suitable water absorption and water vapour transmission ratio. The non-protonated amphiphilic GC-DEAP under pH 7.4 facilitated the formation of uniform and smooth nanofibers with polycaprolactone (PCL) and Cip. However, the GC-DEAP was demonstrated to sharply respond to the mild-acid environment of the wound and effectively be protonated, and thus improved the swelling ability of NFM and triggered burst release of Cip. Due to the combination between protonated GC-DEAP and Cip, PCL/GC-DEAP/Cip NFM achieved attractive antibacterial activity in the mild-acid environment in vitro , and induced more efficient prevention of wound infection and faster wound healing compared with the commercial chitosan dressing. The designed NFM is expected to be a potential smart wound dressing against hemostatic and inflammatory phases with mild-acid specifically strengthened antibacterial features and satisfactory biocompatibility.
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高影响因子
Polymers
·
2021
·Vol. 13
·期 4
·573
·
IF 4.329
Kejiao Li,Yuhong Qi,Yingju Zhou,Xiaoyu Sun,Zhanping Zhang
Polyurethane has a microphase separation structure, while polyethylene glycol (PEG) can form a hydrated layer to resist protein adsorption. In this paper, PEG was introduced to polyurethane to improve the antifouling properties of the polyurethane, providing a new method and idea for the preparation of new antifouling polyurethane materials. The mechanical properties, hydrophilicity, swelling degree, microphase separation and antifouling performance of the coatings were evaluated. The response characteristics of the polyurethane coatings in a seawater environment were studied, and the performance changes of coatings in seawater were tested. The results showed that the crystallized PEG soft segments increased, promoting microphase separation. The stress at 100% and the elasticity modulus of the polyurethane material also markedly increased, in addition to increases in the swelling degree in seawater, the water contact angle decreased. A total of 25% of PEG incorporated into a soft segment can markedly improve the antibacterial properties of the coatings, but adding more PEG has little significant effect. After immersion in seawater, the coatings became softer and more elastic. This is because water molecules formed hydrogen bonding with the amino NH, which resulted in a weakening effect being exerted on the carbonyl C=O hydrogen bonding and ether oxygen group crystallization.Keywords:poly(ethylene glycol)-segmented polyurethane coating;seawater immersion;microstructure;properties
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2021
·
IF 5.875
Xiao Lin,Hui Fu,Zhenhai Hou,Youliang Si,Weiguang Shan,Yan Yang
Extruded three-dimensional (3D) printing based on photocurable materials has shown good application prospects in the medical field. This has been attributed to the operational aspect that can be performed at room temperature and the high mechanical strength of the extrudate and final product. However, the commonly used photocurable polymer, polyethylene glycol diacrylate (PEGDA), has a low viscosity and exhibits a long crosslinking time. Therefore, additives are added to improve the printability of the extrudate. In this study, various hydrogels were used to improve the mixing uniformity and rheological behavior of PEGDA-based printing materials. Printing accuracy and mechanical strength were evaluated to optimize print material composition and process parameters. Hydroxypropyl methylcellulose K100M was found to improve the shear thinning and self-supporting properties of printing materials, which were essential for printability. Although the storage modulus of the photocured material proportionally increased with curing time in the range of 20–80 s, the minimal layer time of the 3D samples remained at 65 s, ensuring interlayer adhesion. Gastro-floating tablets with different infill densities were printed to illustrate the application of 3D extrusion printing in personalized medicine. The weight, crushing strength, and floating time were regulated by the infill density of the models. Overall, this study demonstrates that extrusion printing with a photocurable material is an easy way to prepare customized oral preparations with complex internal structures and tunable properties.
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危险品化学品经营许可证（带存储）