COLLOID AND POLYMER SCIENCE
·
2016
·Vol. 294
·期 8
·1359-1367
·
IF 1.89
Yu Fengyang,Fang Yi,Wang Jingjing,Xu Yanling,Shi Jun
Microcapsules with smooth, transparent, and compact walls used for electrophoretic displays (EPDs) were prepared and characterized. The approach to fabricate EPD microcapsules was based on templating an oil-in-water emulsion stabilized by monodispersed poly(methyl methacrylate- co -butyl methacrylate- co -acrylic acid) latex particles synthesized by dispersion polymerization. The individual latex particles were then transformed into robust capsule walls by successively using solvent swelling, covalent cross-linking, and sintering. The diameter of the emulsion droplets was controlled by changing the concentration of latex in the emulsion, and the thickness of the wall changed according to the diameter of the latex particles. These microcapsules for EPDs were applied successfully in preparing a clock display panel controlled by a single-chip microprocessor operated at a low direct current voltage, demonstrating that these microcapsules can be used in EPDs.
研究领域:
材料科学
·
高分子化学
·
显示技术
·
微加工技术
·
电子器件
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xuexue Xiang,Jing Gao,Fujun Wang,Lu Wang
The utilization of phase change materials (PCMs) in thermal storage technology exhibits great potential for various applications in thermal management and latent heat storage systems. However, leakage of organic PCMs hinders its practical application. Encapsulation of PCMs in microcapsules with polymer shells can prevent PCM leakage while improving heat transfer and stability. In this study, shell monomers were introduced as an immiscible third phase into the traditional o/w two-phase emulsion system, and the formed three-phase complex emulsion was dynamically reconfigured to exhibit a core–shell encapsulated conformation induced by interfacial tension, resulting in the formation of a thermodynamically stable double emulsion. Microcapsules with 1,6-hexanediol diacrylate (HDDA) shells were successfully prepared using this double emulsion as a template. The emulsion configuration is of significant advantage in promoting stable encapsulation of the phase change material in the shell material, resulting in fast and efficient encapsulation and improved utilization of the phase change material. Phase change microcapsules with different phase change temperatures were prepared and characterized using n-octadecane (C 18 ), methyl stearate (Mes), n-eicosane (C 20 ) and n-docosane (C 22 ) as phase change materials, respectively. Results show that the prepared microcapsules are spherically integrated, with smooth surfaces and obvious core–shell structures, and the enthalpies of phase transition of C 18 , Mes, C 20 and C 22 microcapsules are as high as 171.86, 122.37, 165.77 and 178.69 J/g, respectively. These microcapsules exhibit excellent thermal stability and durability and the encapsulation efficiencies exceed 99.7 % at different phase change temperatures. Furthermore, the potential applications of PCM microcapsules in the field of temperature regulation were also demonstrated. This double-emulsion template method provides a straightforward, rapid and scalable approach for the mass production of microcapsules with different core–shell compositions.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JACS Au
·
2024
·
IF 8.5
Lu Liu,Sicheng Fan,Wendi Wang,Sixing Yin,Zirui Lv,Jie Zhang,Jingyu Zhang,Lanhao Yang,Yuzhu Ma,Qiulong Wei,Dongyuan Zhao,Kun Lan
Mesoporous materials endowed with a hollow structure offer ample opportunities due to their integrated functionalities; however, current approaches mainly rely on the recruitment of solid rigid templates, and feasible strategies with better simplicity and tunability remain infertile. Here, we report a novel emulsion-driven coassembly method for constructing a highly tailored hollow architecture in mesoporous carbon, which can be completely processed on oil–water liquid interfaces instead of a solid rigid template. Such a facile and flexible methodology relies on the subtle employment of a 1,3,5-trimethylbenzene (TMB) additive, which acts as both an emulsion template and a swelling agent, leading to a compatible integration of oil droplets and composite micelles. The solution-based assembly process also shows high controllability, endowing the hollow carbon mesostructure with a uniform morphology of hundreds of nanometers and tunable cavities from 0 to 130 nm in diameter and porosities (mesopore sizes 2.5–7.7 nm; surface area 179–355 m2 g–1). Because of the unique features in permeability, diffusion, and surface access, the hollow mesoporous carbon nanospheres exhibit excellent high rate and cycling performances for sodium-ion storage. Our study reveals a cooperative assembly on the liquid interface, which could provide an alternative toolbox for constructing delicate mesostructures and complex hierarchies toward advanced technologies.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2020
·Vol. 306
·期 1
·2000509
·
IF 3.853
Bo Mu,Jianbing Cui,Baoping Yang,Jinfeng Cui,Junhong Guo,Li Tian
In this work, polyurethane (PU) materials containing paraffin oil are successfully prepared via an emulsion template method, which realizes the one-pot preparation of self-lubrication materials. The results show that the block copolymer surfactant (PEG 20 -PPG 70 -PEG 20 , P-123) can stabilize the nonaqueous PU emulsion with the paraffin oil serving both as dispersed phase of oil in oil emulsion and as a lubricant in the materials, and hence enables the fabrication of oil incorporating PU materials accordingly. Tribological tests show that the friction coefficient of PU material with 35% paraffin oil decreases to 0.05 which account for 93.06% reduce compared to that of pure PU.
研究领域:
材料科学
·
摩擦学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2017
·Vol. 28
·期 12
·1929-1936
·
IF 1.907
Yun Zhu,Zhen Lu,Jianding Chen,Shengmiao Zhang
A new class of porous materials, having hydrophobic scaffold embedded with aligned porous hydrophilic domains, was in situ fabricated through combination of emulsion-templated method and unidirectional freezing technique. A water-in-oil high internal phase emulsion (HIPE) was prepared with the mixture of styrene and divinylbenzene as continuous phase and a poly(vinyl alcohol) (PVA) aqueous solution as dispersed phase. After polymerization of the continuous phase and subsequently unidirectional freezing, the dispersed phase, a macroporous poly(styrene/divinylbenzene) embedded with an aligned PVA domain, was obtained. The effects of the polymerization temperature, PVA concentration, and freezing rate on these porous materials were investigated. It was found that the PVA domain size and the aligned channel size were dependent on the polymerization temperature, the PVA concentration, and freezing rate. The fabrication method in this work, combining of unidirectional freezing and emulsion template, not only allows to prepare hydrophobic–hydrophilic polyHIPEs having a sea island structure but also dramatically improves the stiffness and specific surface area of the resulting polyHIPEs. Copyright © 2017 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 13
·7263-7276
·
IF 6.123
Qiao Liangzhi,Liao Yuxin,Wang Xiawen,Wang Shanshan,Du Kaifeng
Cellulose microspheres are commonly chromatographic media yet seriously limited in biomacromolecules separation and purification due to the slow mass transfer kinetics resulting from their narrow nanopores. Herein, a macroporous cellulose microsphere (MCM) with enhanced mass transfer ability has been successfully developed by an oil-in-water-in-oil (O 1 /W/O 2 ) double emulsion strategy. The evolution profile of the double emulsion was tracked and achieved the optimization of interconnected macroporous structure. The macroporous structure not only provide fast mass transfer pathways for proteins but also increase the accessibility of meso/micropores. Benefitting from the macropores, the obtained diethylaminoethyl-modified MCM (DEAE-MCM) exhibits high permeability (3.81 × 10 –13 m 2 ), and fast adsorption rate (reaching equilibrium within 40 min) and high adsorption capacity (334.21 mg/g) for bovine serum albumin, far superior to commercially DEAE Sepharose Fast Flow. More importantly, under the high flow rate, DEAE-MCM remains a high dynamic adsorption capacity, promising it for fast protein chromatography.
研究领域:
生物化学
·
材料科学
·
分离技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jierui Wang,Jialin Yang,He Zhu,Bo-Geng Li,Shiping Zhu
The construction of MOF monoliths can solve the drawbacks of MOF powders in practical applications that can cause high pressure drop, low mass transfer efficiency, clogging, and complicated operation and recycling treatment, but there are still problems such as MOF pore clogging, difficulty in tuning the pore structure of the monoliths, and poor mechanical properties. Herein, nearly pure ZIF-8 monoliths with hierarchical pore structure were prepared by in-situ converting the amorphous ZIF-8/ZnO nanoparticles stabilized HIPE templates into continuous ZIF-8 skeleton. The obtained ZIF-8 monoliths exhibit low bulk densities of ∼ 80 mg cm −3 , high BET surface areas of up to 961.3 m 2 /g, and good mechanical properties. The monolith maintained high catalytic activity for 30 h in the Knoevenagel reaction using a homemade continuous flow reactor, revealing its high efficiency and good stability. This work provides a worth-adopted approach to prepare MOF-based monoliths for applications such as adsorption, separation, catalysis and effluent treatment.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 13
·2687
·
IF 4.967
Yuxiao Shi,Xin Zhang,Ketao Mu,Yifan Wang,Ting Jiang,Shangtong Jiang,Shengmin Zhang,Yingying Du
Polymer porous microspheres with large specific surface areas and good fluidity have promising important applications in the biomedical field. However, controllable fabrication of porous microspheres with precise size, morphology, and pore structure is still a challenge, and phase separation caused by the instability of the emulsion is the main factor affecting the precise preparation of porous microspheres. Herein, a method combining the iso-density emulsion (IDE) template and microfluidics was proposed to realize the controllable preparation of polymer porous microspheres. The IDE exhibited excellent stability with minimal phase separation within 4 h, thus showing potential advantages in the large-scale preparation of porous microspheres. With the IDE template combined microfluidics technique and the use of a customized amphoteric copolymer, PEG-b-polycaprolactone, polycaprolactone (PCL) porous microspheres with porosity higher than 90% were successfully prepared. Afterwards, the main factors, including polymer concentration, water–oil ratio and homogenization time were investigated to regulate the pore structure of microspheres, and microspheres with different pore sizes (1–30 μm) were obtained. PCL porous microspheres exhibited comparable cell viability relative to the control group and good potential as cell microcarriers after surface modification with polydopamine. The modified PCL porous microspheres implanted subcutaneously in rats underwent rapid in vivo degradation and tissue ingrowth. Overall, this study demonstrated an efficient strategy for the precise preparation of porous microspheres and investigated the potential of the as-prepared PCL porous microspheres as cell microcarriers and micro-scaffolds.Keywords:porous microspheres;stable emulsion;double emulsion template;microfluidics;polycaprolactone
研究领域:
生物医学工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Particuology
·
2022
·
IF 3.251
Shenglong Zhang,Kai Wang,Guangsheng Luo
To prepare uniform polystyrene particles with ten microns of diameter, a parallel scaling-up strategy for the capillary-assembled stepwise microchannel was developed, which created uniform droplets with high-throughput and formed a large amount of emulsion templates for the polymerization of styrene and cross-linker. The microchannel droplet generator was robust for the flow rate deviation of the continuous phase in the jetting flow, and droplet generation frequency up to 2.8 × 10 4 Hz was achieved with only four parallel droplet generators, which were much more efficient than the parallelly scaled microfluidic devices working in dripping flow. 32–52 μm average diameter droplets with 4.5%–8.4% diameter variation coefficients were successfully prepared from the microchannel device fabricated by low-cost 3D-print method, and the droplets were subsequently turned to solid particles via a two-step polymerization in the platform. The polystyrene particles were further reduced to 16.9–23.5 μm with 5.0%–8.6% diameter variation coefficients due to the accompanying emulsion polymerization, and the working capacity of the platform reached hundred milligrams of particles per hour.
研究领域:
材料科学
·
化学工程
·
微流控技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Zunrui Zhong,Ziliang Rui,Zide Wu,Xinyu Zhai,Sisheng Yang,Hao Peng
In view of the present scarcity in the study of very low temperature (<−100 °C) phase change materials (PCMs) and the typical high volatility issue of these low temperature PCMs, the present work aims to develop the potential PCMs and select an appropriate anti-volatile method for cryogenic applications. In this work, cryogenic C 7 ∼C 9 n-alkanes were selected to prepare C 7 -C 8 and C 7 -C 9 binary systems, and their phase equilibrium behavior and thermophysical properties were investigated. For volatility problem, anti-volatility emulsion templates were successfully synthesized by high-energy emulsification method. The volatilization rate of the emulsion templates was characterized by combining DSC and mass transfer model, and the preparation parameters of the emulsion template with the finest anti-volatility were obtained. The results show that the eutectic compositions of C 7 -C 8 and C 7 -C 9 binary systems are 12 wt%C 8 and 10 wt%C 9 , respectively. Both eutectic systems have eutectic temperatures suitable (−99.4 °C for C 7 -C 8 , −103.1 °C for C 7 -C 9 ), satisfactory melting enthalpy (127.6 J/g for C 7 -C 8 , 129.7J/g for C 7 -C 9 ), and good phase transformation reversibility for cryogenic energy storage. Under the optimized preparation parameters (WOR=2:1, EOR=18%, HLB=11.44), the volatilization coefficient of emulsion template is reduced from the maximum of 0.01408/min to 0.00236/min, which implies that the anti-volatility of emulsion is enhanced by nearly 6 times.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Wenbo Miao,David Julian McClements,Zhiheng Zhang,Qianzhu Lin,Hangyan Ji,Jinpeng Wang,Zhengyu Jin,Guanghua Li,Liming Jiang,Jinsheng Wen,Shangyuan Sang,Chao Qiu
The creation of solid fat substitutes using food-grade biopolymers is currently an important focus of food researchers trying to develop healthier food products. In this study, emulsion-templated oleogels assembled from octenyl succinic anhydride starch (OS)-chitosan (CS) electrostatic complexes were prepared. The effects of the OS-CS complexes on the intermediate (emulsion) and final (oleogel) products were investigated. Emulsions stabilized by OS-CS complexes had greater interfacial layer stability and mechanical strength than those stabilized by only OS. The oil loss from the oleogels decreased significantly ( p < 0.05) as the chitosan concentration was raised: from 10.28 to 1.5% oil loss for 0.1–1% CS. The rheological measurements showed that CS incorporation improved the viscoelasticity and thixotropy of the oleogels. In addition, adsorption of the OS-CS complexes inhibited lipid oxidation and hydrolysis due to its compact network and stable interfacial structure. Our results show that OS-CS complexes are effective emulsion-template oleogelators, which may be useful for creating new edible functional materials for application in the food industry.
研究领域:
食品科学
·
生物材料学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2021
·Vol. 17
·期 8
·2327-2339
·
IF 3.679
Caimei Zhao,Lei Chen,Chuanming Yu,Binghua Hu,Haoxuan Huang,Yongjie Chen,Xin Wang,Yongshi Ye,Xiaohui Zhuang,Yong Li
Super-hydrophobic porous absorbents are convenient, low-cost, efficient and environment-friendly materials in the treatment of oil spills. In this work, a simple Pickering emulsion template method was employed to fabricate an interconnected porous poly(DVB–LMA) sponge. A new co-Pickering stabilization system of Span 80 and NiFe2O4 nanoparticles was used to prepare ultra-concentrated internal phase water-in-oil (W/O) emulsions. After further polymerization, the resulting sponges were generated, which exhibited excellent adsorption selectivity due to the super-hydrophobicity and super-lipophilicity. Furthermore, the characterization results indicated that the composites had superior thermal stability, low density, high porosity and a flexible three-dimensional porous structure. Besides, the addition of nickel ferrite nanoparticles provided the materials with extra magnetic operability. High oil adsorption capacity (up to 36.9–84.2 g g−1), high oil retention, fast adsorption rate and superior reusability allowed the materials to be applied in the treatment of oily water.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）