COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2020
·
IF 6.444
Lei Yang,Chen Jiang,Jiaxing Yan,Yifeng Shen,Yi Chen,Lei Xu,He Zhu
Flexible conductive polymer composite foams are promising materials as piezoresistive sensors. Unfortunately, the common solid-templated fabrication method is limited by the scarcity of template structure, which hinders the improvement of sensing performance through rational design of the pore structure. Herein, a series of graphene oxide (GO)-based flexible conductive foams with unimodal and broad pore size distribution, and hierarchically porous structure were fabricated through high-internal-phase emulsions (HIPEs) as liquid templates. The pores were structured by tuning the droplet size distribution of HIPEs, which were regulated by changing the pH and GO loadings. The pore structure had great effect on the mechanical, electrical, and piezoresistive properties of the developed foams. Compared to foams with either unimodal or broad pore size distribution, the hierarchically structured foams exhibited more than 50% increase in Young’s modulus, more than 30% improvement in pressure sensitivity, and broadened pressure responsive ranges up to more than 200 kPa.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2019
·Vol. 4
·期 6
·1136-1144
·
IF 3.935
Mengjie Wang,Meng Wang,Yun Zhu,Shengmiao Zhang,Jianding Chen
Enzyme functionalized porous beads were fabricated through covalently immobilizing Candida antarctica lipase B (CALB) onto high internal phase emulsion (HIPE) templated poly(glycidyl methacrylate) (PGMA) beads. These millimeter-sized beads were prepared by photopolymerizing the continuous phase of HIPE drops and then removing the dispersed phase. By covalently coupling the lysine residues of CALB to the epoxy groups from GMA, a series of enzyme immobilized polyHIPE beads were produced, with an enzyme loading of up to 0.18 g g−1 carrier. The resulting immobilized enzyme was highly stable to temperature and storage and could be recycled multiple times. The immobilized enzyme maintained 85% residual activity after 5 reaction cycles and 60% residual activity after 30 days of storage. The enzymatic esterification between hexanol and hexyl hexanoate had a conversion rate of up to 95%, showing that the enzyme immobilized beads were a good enzyme catalyst.
研究领域:
生物技术
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材料科学
·
酶学
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产品关联
DOI
高影响因子
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
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2016
·
IF 2.371
Guihua Ruan,Zhenwei Wu,Yipeng Huang,Meiping Wei,Rihui Su,Fuyou Du
A large-scale high-efficient enzyme reactor based on polymerized high internal phase emulsion monolith (polyHIPE) was prepared. First, a porous cross-linked polyHIPE monolith was prepared by in-situ thermal polymerization of a high internal phase emulsion containing styrene, divinylbenzene and polyglutaraldehyde. The enzyme of TPCK-Trypsin was then immobilized on the monolithic polyHIPE. The performance of the resultant enzyme reactor was assessed according to the conversion ability of N α -benzoyl- l -arginine ethyl ester to N α -benzoyl- l -arginine, and the protein digestibility of bovine serum albumin (BSA) and cytochrome (Cyt-C). The results showed that the prepared enzyme reactor exhibited high enzyme immobilization efficiency and fast and easy-control protein digestibility. BSA and Cyt-C could be digested in 10 min with sequence coverage of 59% and 78%, respectively. The peptides and residual protein could be easily rinsed out from reactor and the reactor could be regenerated easily with 4 M HCl without any structure destruction. Properties of multiple interconnected chambers with good permeability, fast digestion facility and easily reproducibility indicated that the polyHIPE enzyme reactor was a good selector potentially applied in proteomics and catalysis areas.
研究领域:
生物化学
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催化工程
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蛋白质组学
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
·
IF 5.455
Yulai Zhao,Jing Zhang,Zhikui Zhao,Haoran Chen,Longqiang Xiao,Linxi Hou
High internal phase emulsion (HIPE) templating is a versatile strategy to prepare porous polymers and carbons. However, the prepared porous carbon materials usually show low specific surface area (SSA) due to the feature of macropores, which hampered their wider applications. This work developed a novel strategy, namely internal phase-external phase coefficient HIPE (IP-EP coHIPE) templating, to prepare polymer-derived hierarchically porous carbons (HPCs) with high SSA. In the strategy, sodium alginate (SA) aqueous solution was selected as the internal phase and emulsified in external oil phase containing divinylbenzene (DVB). HPCs were obtained by sequentially polymerizing the external phase, crosslinking the internal phase and carbonization . The testing results indicated that this strategy provided HPCs with notably enhanced porosity and increased SSA when compared with conventional HIPE method via the further utilization of the void space of polyHIPE-based HPCs via a facile way. The porous architectures of HPCs can be adjusted by changing the volume fraction and/or the concentration of the internal phase, respectively. The potential applications of the obtained HPCs were evaluated as the electrode material of supercapacitor . The specific capacitance of optimized HPC-based supercapacitor is 306 F/g, much higher than that based on general polyHIPE-derived HPC (145 F/g) at 1 A/g, which can be attributed to its enhanced porosity, hierarchically porous architecture and high SSA (2289 m 2 /g).
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
POLYMER
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2018
·
IF 3.483
Zhen Yang,Liqin Cao,Jing Li,Jiangli Lin,Jide Wang
Macroporous poly( N -methylol acrylamide)–high internal phase emulsion [poly(NMA)HIPE] composite monoliths were prepared by carbon dioxide-in-water (CO 2 /W) emulsions using metal-organic framework (MOF) Cu-BDC (BDC = 1,4-dicarboxybenzene) as stabilizer . The composite monoliths were characterized using XRD , SEM, EDS-mapping, FT-IR, TG, and mercury injection methods. Increasing the internal phase fraction would lead to the decrease of monolith density and the increase of void size, and it is favorable for the formation of macroporous interconnected structure with low density and porosities up to 81.6%. The mechanical properties of the Cu-BDC/poly(NMA)HIPE and Cu-BDC removal were also evaluated. The composite polyHIPEs exhibited high antibacterial activity against Escherichia coli . The presented approach facilitated the clean manufacture of open-celled MOF based scaffolds in a one-pot process with porosity of up to 82%.
研究领域:
材料科学
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化学工程
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Yuxi Wang,Yue Huang,Huameng Li,Yuyuan Luo,Difei Dai,Yuhao Zhang,Hongxia Wang,Hai Chen,Jihong Wu,Hongjie Dai
Low concentrations of gelatin (0.02–0.20 wt%) were applied to regulate the surface and interface properties of CNC (0.50 wt%) by forming CNC/G complexes. As gelatin concentration increased from 0 to 0.20 wt%, the potential value of CNC/G gradually changed from −44.50 to −17.93 mV. Additionally, various gelatin concentrations led to micromorphology changes of CNC/G complexes, with the formation of particle interconnection at gelatin concentration of 0.10 wt%, followed by network structure and enhanced aggregation at gelatin concentration of 0.15 and 0.20 wt% respectively. The water contact angle (25.91°-80.23°) and interface adsorption capacity of CNC/G were improved due to hydrophobic group exposure of gelatin. When gelatin concentration exceeded 0.10 % at a fixed oil phase volume fraction (75 %), a high internal phase emulsion (HIPE) stabilized by CNC/G can be formed with a good storage stability. The rheological and microstructure results of HIPE confirmed that low gelatin concentration can assist CNC to form stable emulsion structure. Especially, the auxiliary stabilization mechanism of various gelatin concentration was different. CNC/G-0.10 % and CNC/G-0.15 % stabilized HIPE mainly depended on the enhanced interface adsorption and network structure, while CNC/G-0.20 % stabilized HIPE mainly relied on enhanced interface adsorption/accumulation due to weak electrostatic repulsion and aggregate granular morphology of CNC/G-0.20 %.
研究领域:
材料科学
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化学工程
·
胶体与表面化学
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产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2018
·
IF 2.975
Yun Li,Chao Gong,Ting Zhang,Xinhui Feng,Xiaolong Zhou,Chenglie Li
Porous polymer support beads modified by a silicone resin with bifunctional groups were prepared by using High Internal Phase Emulsion (HIPE) templated method. Their surface properties and morphological characteristics were investigated. The effect of silicone resin content has been highlighted. When the content of the silicone resin was 30%, the support exhibited a relatively higher hydrophobicity (contact angle was 118.8°) and suitable pore diameter distribution. The Sulfate Reducing Bacteria (SRB) loading biofilm/support and its desulfurization experiments for the sewage with 1000–4000 mg SO 4 2− /L have been performed, and the result shows that the polymer bead support has given higher sulfate reducing rates than that of the traditional active carbon (AC) beads and the maximum sulfate reducing rate reached to 84.56% for the wastewater with 1000 mg SO 4 2− /L after 12 h.
研究领域:
环境工程
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生物技术
·
水处理
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产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2022
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IF 6.056
Nannan Chen,Baoyan Yang,Ying Wang,Ning Zhang,Ying Li,Chaoying Qiu,Yong Wang
Flaxseed protein contains mainly 11S globulin (FG). It suffers significant aggregation upon heating, ionic strength and pH variation which hinders its application in food products. This study aims at improving the colloidal stability of FG by fabricating a flaxseed 11S globulin-soy 7S globulin (SG) complex and exploring its potential application in stabilizing emulsion. Results showed that SG could limit the thermal aggregation of FG by forming a stable FG-SG complex above 80 °C at neutral pH. Increasing temperature and heating time would promote the exposure of hydrophobic sites and facilitate the complexation that was irreversible. The complex showed enhanced stability against ionic strength and pH variation and was able to stabilize high internal phase emulsion (HIPE) with oil volume fraction up to 85% by a minimal protein concentration of 20 g/L which however could not be achieved solely by flaxseed 11S globulin. The HIPEs showed long term stability in a wide range of pH and ionic strength. This study paves way for enhancing the functionalities of oilseed 11S globulin simply through thermal induced complexation with 7S globulin from another plant source.
研究领域:
食品科学
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蛋白质化学
·
胶体科学
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产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Yao Chen,Wen Guan,Yunlei Zhang,Changhao Yan,Bing Li,Yanan Wei,Jianming Pan,Yongsheng Yan
As a very promising biofuel or fuel additive, the synthesis of 5-ethoxymethylfurfural (EMF) directly from renewable carbohydrates is an important biomass transformation process. Herein, a novel bifunctional catalyst has been successfully synthesized via a Pickering high internal phase emulsion (HIPE) template and pore-filled strategy and employed for the production of EMF from glucose in a one-pot manner. Catalytic results indicated that the grafted Cr3+ by the atom transfer radical polymerization (ATRP) method smoothly processed the isomerization of glucose to intermediate fructose and that the accessible −SO3H and Cr3+ active sites coexisted in the obtained bifunctional catalyst possessing synergistic effects. A high EMF yield of 48.1% was achieved under optimal reaction conditions in an ethanol/tetrahydrofuran (THF) medium. Besides, employing inulin, sucrose, cellobiose, maltose, and starch as the starting materials excellent EMF yields were also obtained over the developed bifunctional catalyst. This study offers new insights into the design of functional catalysts anchoring desirable active sites, and also highlights their applications for biomass transformation.
研究领域:
化学工程
·
可再生能源
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Haotian Zhang,Hongxia Wang,Hongjie Dai,Hai Chen,Liang Ma,Yuhao Zhang
In this study, a stabilized low-oil emulsion and high internal phase emulsion gels (HIPE gels) integrated preparation method is proposed. Highly stable low-oil emulsions, prepared using tight ternary complexes formed by incorporating tannic acid (TA) into gelatin/cellulose nanocrystals (GLT/CNC) complexes mainly through strengthening hydrogen-bonding interaction. The subsequent heating-centrifugation process was used to enable the conversion of GLT/CNC/TA stabilized low-oil emulsions to stabilized HIPE gels, and systematically investigated the regulation of emulsion properties by TA concentrations. The ternary complexes formed by appropriate concentration of TA (0.6 %) can form stable low-oil emulsions with smallest average particle (36.1 ± 0.25 μm) size and best rheological properties, while the rheological properties of HIPE gels were similarly regulated by the TA concentration (0 %, 0.2 %, 0.6 %, 1.0 %, 1.2 %). Heating induced flocculation of low-oil emulsions without causing demulsification, allowed for the subsequent centrifugation to yield stable HIPE gels, significantly superior to the GLT/CNC/TA-stabilized HIPE gels prepared by conventional methods that typically exhibit thermal instability. TA effectively promoted the interfacial adsorption of GLT/CNC and tight stacking of oil droplets to build a more stable network structure in the continuous phase. HIPE gels with 0.6 % TA demonstrated excellent 3D printability with optimal dimensional resolution and surface quality, presenting a novel strategy for HIPE gel preparation and versatile emulsion applications.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
食品科学
·
3D打印
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2015
·
IF 0
Wang Fa Xu,Fa Meng Sun,Jing Bo Liu,Xiao Fang Li,Fa Ai Zhang
A series of porous poly(styrene-divinylbenzene) monoliths (polyHIPE) was synthesized by high internal phase emulsions (HIPE). The effects of the ethanol contents on the microstructure of the polyHIPE were characterized by scanning electron microscopy and mercury intrusion porosimeter. The adsorption and release behaviors of the polyHIPE for a monomer mixture consisting of dicyclopentadiene (DCPD) /styrene (St) (DS, mass ratio of 9/1) were investigated. The polymerization of the mixture DS within pores of the polyHIPE was studied. The results showed that the microstructure of the polyHIPE was significantly influenced by the ethanol content. The increase of ethanol in the HIPE increased the internal pore diameter and decreased the pore volume of the polyHIPE, thus decreased the DS absorption and increased the release rate. The DS monomer can enter the pores(cavities, windows) and fill the original holes after the polymerization. Compared with conventional polymerization of DCPD/St, the poly(DCPD/St) (pDS) obtained from confined spaces possess higher molecular weight, broader molecular weight distribution, and higher Tg. As the pore diameter increased, the effect of space confinement reduced, and the performances of pDS were closed to that prepared by conventional polymerization.
研究领域:
材料科学
·
化学工程
·
高分子化学
✓ 已验证
DOI
LANGMUIR
·
2023
·
IF 3.9
Yanyu Chen,Jie Li,Yingfei Yang,Junjie Yang,Huaijun Lin,Qiwei Wang,Xusheng Yang,Yuying Meng,Wei Li,Zhidan Lin,Peng Zhang
Increasingly, oil spills and industrial discharges are wreaking havoc on the water environment; in order to efficiently separate oil and water from sewage containing oil or organic solvents, a novel porous polymer (P(EHA-co-BA)) was prepared by Pickering high internal phase emulsion (HIPE) template method. To obtain polyHIPE with better oil/water separation capacities, octadecyltrichlorosilane (OTS)-modified carbon nanotubes (CNTs) and surfactants were used as costabilizers for HIPE, which improved the stability of HIPE as well as the mechanical properties and the separation efficiency of polyHIPE. In the presence of 1 wt % OTS-CNT adding in the oil phase, 1%OTS-CNT polyHIPE has high porosity (92.21%), favorable hydrophobicity (a water contact angle of 128°), and excellent mechanical properties. As a result, 1%OTS-CNT polyHIPE has high absorption of oils and oily solvents, e.g., dichloromethane up to 36 g/g, and maintains an absorption efficiency of >97% after 20 reapplications. In the formulation of polyHIPE, cinnamaldehyde (CA) has been added to provide superior antibacterial properties against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). It appears that the novel polyHIPE proposed in this work is a reusable antibacterial porous polymer with promising applications for oil–water separation.
研究领域:
材料科学
·
环境工程
·
化学工程
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）