JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhenjie Ma,Xiangshang Chen,Gaoyang Zhou,Yue Jia,Huayan Chen,Xiaolong Lu
A stability-enhanced extraction gel membrane (EGM) with a thin functional layer of carrier for metal ion recovery was prepared and improved by cross-linking technology. Hydroxyl-terminated polybutadiene (HTPB) was used as the coupling agent to form a cross-linked network skeleton. Polymethylhydrosiloxane (PMHS) and HTPB were hydrosilylated to form a compact cross-linked structure. In addition, the D2EHPA (carrier) was fixed on polymer cross-linked structure. The prepared stability-enhanced EGM was characterized by SEM, EDS, ATR-IR, XPS . The influence of preparation parameters was studied and compared systematically. The optimum preparation conditions obtained from the data indicate that the total polymer concentration is 8 wt%, the mass ratio of HTPB/PMHS is 1:2, and the mass ratio of TEOS/VTES is 1:1. After 72 h of stability experiments, the mass transfer flux decreased from 2065.46 mg m −2 h −1 –1718.82 mg m −2 h −1 , the overall flux attenuation rate is only 16.8 %, which is 50.8 % lower than that of EGM without surface enhancing layer. In comparison, the flux attenuation rate of the traditional supported liquid membrane (SLM) even reached 100 % after 66 h. Therefore, the stability-enhanced EGM prepared in this study presents obviously higher operating stability compared with the EGMs operated at same conditions. The results suggest a potential approach for metal ions removal from water with high efficiency and stability.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaodong Hu,Shanshan Zhang,Bo Yang,Ming Hao,Zhijun Chen,Yanbo Liu,Xiaoxiao Wang,Jinbo Yao
Ambient drying is currently the cheapest and most efficient way to prepare aerogels, but it is invisible for the preparation of cellulose aerogels. In this paper, we describe a method of preparing cellulose aerogels that can be dried under atmospheric pressure by freeze-linking technique. The amino silane coupling agent forms an amino-rich polymer layer on the bacterial cellulose surface during the freezing process. And, the cross-linked network constructed by Schiff base reaction can strengthen the fiber skeleton in the process of solvent exchange. Due to the double cross-linked network structures, the cellulose ethanol gel can be dried directly under atmospheric pressure at 60 °C and the volume shrinkage can be as low as 3.3 %±1.4 %. In the process of solvent exchange, the loss of some polysiloxane causes defects in the aerogel, which not only reduces its thermal conductivity but also increases its specific surface area. And the water resistance, thermal performance, and dye adsorption performance of the aerogel are also significantly improved. This study provides a low-cost and high-efficiency solution for the manufacture of cellulose aerogels and promotes their wide applications.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 38
·e52914
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IF 3.057
Junzhi Lin,Xianger Xia,Yifei Liu,Zhenchao Luan,Yezhen Chen,Kunkai Ma,Bing Geng,Hui Li
Fluoro-PolyHIPEs with porous structure exhibit an excellent weather resistance for adsorption, separation or catalyst support applications in extreme environments, however, the specific surface area still needs to be improved. In this study, a porous fluorinated material is prepared by using high internal phase emulsion template method, and the porous structure of fluoro-PolyHIPE (F-PolyHIPE) is subsequently excavated and modified by the hypercrosslinking “knitting” method. The “knitting” of micropores in the pore walls of the fluoropolymer is achieved through the Friedel-Crafts alkylation reaction by using dimethoxymethane (FDA) as the external crosslinker. It transforms the macroporous fluoropolymer prepared based on HIPE emulsion template method into hierarchical porous fluoro-PolyHIPE (HCPF-PolyHIPE) with a high specific surface area. The specific surface area of the porous fluorinated material demonstrates an increment from 15.6 m 2 g −1 to 353.2 m 2 g −1 after hypercrosslinking. Owing to the introduction of the micropores and mesopores as well as the enrichment of the fluorine atoms in the polymer network, HCPF-PolyHIPE can be successfully applied for CO 2 adsorption, thus, representing a major achievement of the study. Moreover, HCPF-PolyHIPE exhibits excellent thermal stability as well as acid and alkali resistance, thus, confirming potential application prospects in the fields of oil-water separation and gas adsorption.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 16
·13453-13460
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IF 3.201
Zhangkang Li,Huiyu Bai,Shengwen Zhang,Wei Wang,Piming Ma,Weifu Dong
In this paper, poly(N-isopropylacrylamide) (PNIPPAm), polyacrylic acid (PAA), polyvinyl alcohol (PVA) and cellulose nanocrystals (CNC) were used to prepare double-network hydrogels by the photo-crosslinking technology. The results from mechanical and swelling tests indicated that photo-crosslinked PVA/CNC/P(NIPPAm-co-AA) hydrogels exhibited temperature-sensitive, pH-sensitive behaviors and good mechanical strengths. We prepared DN hydrogels, which combined the advantages of PNIPAAm, PAA and photo-crosslinking collectively in the PVA/CNC system, leading to controllable temperature and pH responses and improvement in physical properties. A simple and green method for the preparation of DN hydrogels was demonstrated, offering photo-crosslinked PVA/CNC/P(NIPPAm-co-AA) hydrogels as excellent prospects for applications in the medical field.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2019
·Vol. 220
·期 15
·1900206
·
IF 2.622
Ruchao Yuan,Shuo Fan,Yanlu Sun,Dequn Wu,Xueli Wang,Jianyong Yu,Faxue Li
A novel micro cross-linking technology is proposed to enhance the mechanical properties of poly(ethylene terephthalate) (PET)-based thermoplasctic elastomers (TPEEs) whose molecular weights are difficultly increased via traditional synthetic technologies. It is found that the brittle fractures of TPEEs, usually observed in polymers with low molecular weights, can be converted into ductile form with the introduction of a certain fraction of 1,2,3,4-butane tetracarboxylic acid as a cross-linking agent. Unlike the traditional cross-linking technologies, which usually cause the elastomers to suffer the deficiencies of extremely high stiffness, inherent weakness, and the inability to be efficiently reused, TPEEs still maintain their elastomeric characteristics well with the incorporation of micro cross-linking structure and are endowed with a well-defined microphase-separated structure, excellent tensile properties, and the abilities to be melt-processed and reused. This work offers a new guideline to improve the mechanical properties for polymers with relatively low molecular weights.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jiezhou Wu,Gen Li,Tingjun Ye,Guanghua Lu,Runmin Li,Lianfu Deng,Lei Wang,Ming Cai,Wenguo Cui
Injection of cell-laden hydrogel microspheres is a minimally invasive method for tissue regeneration. However, microspheres are usually limited by structural heterogeneity, uneven size, low cell loading capacity, and poor cell survival rate. We devised a microfluidics synchronous cross-linked technology to obtain injectable homogenous porous microspheres of desired particle (50–400 μm) and pore (0–50 μm) size by adjusting the flow rate and concentration of gelatin methacrylamide (GelMA). The synchronous cross-linking controlled the strength of cross-linking and prevented fusion and uneven cross-linking. The freeze-dried microspheres of particle size 300 μm and pore size 50 μm rapidly adsorbed murine bone marrow-derived stem cells (BMSCs) and maintained their viability and osteogenic potential in vitro . In addition, the cell-loaded porous microspheres promoted tissue regeneration when injected locally into a murine bone defect model. Our results show that hydrogel microspheres generated by the microfluidics synchronous cross-linked technology are stable and biocompatible, and have strong regenerative potential when loaded with stem cells.
研究领域:
组织工程
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再生医学
·
生物材料科学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Chao Zhong,Kuibao Yu,Yuan Qie,Yongshen Yu,Yongyi Lu,Ge Deng,Tailiang Guo,Hailong Hu,Fushan Li
Colloidal quantum dots (QDs) have shown great promise in the development of high-resolution displays for near-eye visual communication with the outside world. However, achieving full-color high-precision assembly of QDs at the nanoscale remains a critical challenge. This study proposes a novel strategy for the region-selective assembly of QDs for achieving ultra-high-resolution light-emitting devices. This approach leverages interface-assembled ultrathin surface microstructures to create specific wettability patterns, guiding the selective assembly of QDs on their surfaces. Ultimately, an ultra-high-resolution 36 599 pixels per inch (PPI) light-emitting device is successfully realized, with a record-high external quantum efficiency (EQE) of 18.74%. The addition of a molecular microstructure enhances the fidelity of the assembled QDs pattern, providing nearly a two-fold increase in contrast ratio while effectively suppressing device leakage current. Additionally, the assembly process is compatible with photo-crosslinking technology, resulting in a full-color light-emitting device with an EQE of 11.01%. Our strategy paves a simple and effective way for advancements in high-performance nano-display technology.
研究领域:
纳米技术
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显示技术
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光电子学
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材料科学
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自组装
·
量子点
✓ 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）