JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Xian-peng Zhang,Jian Luo,Da-xia Zhang,Tong-fang Jing,Bei-xing Li,Feng Liu
In this paper, porous microcapsules with tunable pore sizes were prepared using interfacial polymerization by employing a temperature-responsive cross-linking agent above its so-called cloud point temperature ( T scp ). The influences of porosity on the surface morphology , release profile and biological activity of the microcapsules were investigated. The results showed that both pore size and pore density could be controlled by regulating either the amount of cross-linking agent or the ratio of core material to shell material. Furthermore, the porosity of the microcapsules determined their release properties and further regulated the bioactivity of the microcapsules. In addition, the mechanism of pore formation was confirmed by investigating the morphology of microcapsules below the T scp . The microencapsulation methodology described here is convenient and versatile, which can be easily extended to encapsulate a broad range of lipophilic core materials.
研究领域:
药剂学
·
生物材料
·
纳米医学
·
药物递送
·
高分子科学
✓ 已验证
DOI
高影响因子
FIBERS AND POLYMERS
·
2016
·Vol. 17
·期 11
·1849-1857
·
IF 1.022
Zhang Bin,Han Jian
The poly(vinyl acetate) (PVAc)/zinc oxide (ZnO) microcapsule and PVAc/titanium dioxide (TiO 2 ) microcapsule were synthesized via in-situ emulsion polymerization method. The PVAc/ZnO microcapsule and PVAc/TiO 2 microcapsule were characterized by fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis(TG), transmission electron microscopy (TEM), and UV-visible spectroscopy (UV-vis). Effect of PVAc/ZnO microcapsule and PVAc/TiO 2 microcapsule on properties of poly(lactic acid) (PLA) was evaluated by UV-vis, SEM and mechanical properties test. The results showed that the addition of PVAc/ZnO and PVAc/TiO 2 microcapsules as a UV-blocking additive could significantly enhance UV-blocking property of PLA/PVAc/ZnO microcapsule composites and PLA/PVAc/TiO 2 microcapsule composites compared with pure PLA, PLA/ZnO composites and PLA/TiO 2 composites. The mechanical properties of PLA/PVAc/ZnO microcapsule composites were better than those of PLA/ZnO composites due to good dispersability and compatibility of PVAc/ZnO microcapsule in PLA matrix. Also, the mechanical properties of PLA/PVAc/TiO 2 microcapsule composites were better than those of pure PLA and PLA/TiO 2 composites. This study demonstrates the great potentials of the intrinsically UV shield additive PVAc/ZnO and PVAc/TiO 2 microcapsules in the application of high performance matrix resin and composite material.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2016
·
IF 3.897
Huan Yi,Yonghong Deng,Chaoyang Wang
Facile and efficient encapsulation of epoxy and tetraethylenepentamine (TEPA) in polyurea (PU) microcapsules are accomplished with Pickering emulsion templates by one-step, interfacial polymerization . The formation of microcapsule is deftly achieved by lightly shaking Pickering emulsions. The whole process is time andenergy saving hardly with any waste and residual. Epoxy microcapsules keep the spherical shape with core content of more than 90 wt%. Amine microcapsules shrink a little for evaporation of water and the conserved TEPA after air-dried is 82.1 wt%. The shell walls of two microcapsules are about 1 μm. With the protection of PU shells, both microcapsules exhibit excellent thermal resistance . Furthermore, self-healing function of epoxy and amine microcapsules is measured by incorporating microcapsules into epoxy coating , and tested by brine-submersion corrosion-accelerating experiment. The dual core self-healing coatings demonstrate excellent self-repairing performance with the crack of embedded microcapsules and reaction between epoxy and amine. The core materials can outflow from microcapsules and form isolations for metal substrate from corrosion hazard, therefore, make for good self-repairing and preserving function of the self-healing coating.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 31
·17527-17541
·
IF 4.22
Xue Ying,Li Chunmei,Liu Jin,Tan Jiaojun,Yin Hangyu,Yao Laifeng,Zhang Qiuyu
Abstract Using microcapsules as the stabilizers of Pickering emulsion can endow the resulted composite capsules with more storage microcavities, producing new functional and structural materials, which have potential application in the preparation of self-healing microcapsules to achieve multiple healing. However, the preparation and wettability of microcapsule-type stabilizers (MTS) have not been systematically researched. Herein, a facile method to prepare MTS containing a liquid healing agent (dicyclopentadiene, DCPD) was proposed, which exhibited excellent emulsifying properties in Pickering emulsion. MTS with adjustable wettability were successfully prepared and used to fabricate Pickering emulsions with different oil phases. It was found that when the mass ratio of the hydrophobic shell monomer reached 100%, MTS possessed the best emulsifying property and the resulted Pickering emulsion could be stably stored for 30 days. Additionally, via solidifying the activity monomers of the oil droplets, composite capsules with multi-storage cells were successfully prepared which confirmed the strong stability of this emulsion and the appropriate wettability of MTS again, as well as pave a new path for the preparation of new architecture microcapsules. We expected that MTS will be found more useful in encapsulation fields, such as self-healing microcapsules, biological medicine, cosmetics, and textile. Graphical abstract
研究领域:
材料科学
·
化学工程
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yang Liu,Gen Li,Haojian Lu,Yuanyuan Yang,Zeyang Liu,Wanfeng Shang,Yajing Shen
Core–shell microcapsules as one type of the most attractive carriers and reactors have been widely applied in the fields of drug screening and tissue engineering owing to their excellent biocompatibility and semi-permeability. Yet, the spatial organization of microcapsules with specific shapes into three-dimensional (3D) ordered architectures still remains a big challenge. Here, we present a method to assemble shape-controllable core–shell microcapsules using an untethered magnetic microcapsule-robot. The microcapsule-robot with the shape-matching design can grab the building components tightly during the transportation and assembly processes. The core–shell feature of the microcapsule effectively prevents the magnetic nanoparticles from interacting with bioactive materials. The assembly results of cell-loaded heterogeneous microcapsules reveal that this strategy not only allows the magnetic microcapsule-robot to work in different workspaces in vitro for the creation of 3D constructions but also offers a noninvasive and dynamical manipulation platform by remotely controlling the position and orientation of the soft and liquid-like microcapsule components individually.
研究领域:
生物医学工程
·
组织工程
·
微纳米技术
·
药物筛选
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·119
·
IF 3.426
Wei Zhou,Shu-Jie Hao,Guo-Dong Feng,Pu-You Jia,Xiao-Li Ren,Meng Zhang,Yong-Hong Zhou
Although tung oil is renewable, with an abundant production and low price in China, and it is used to synthesize different polyols for rigid polyurethane foam (RPUF), it remains a challenge to improve the properties of RPUF by redesigning the formula. Therefore, we propose four novel compounds to strengthen the properties of RPUF, such as the catalyst-free synthesis of tung oil-based polyol (PTOK), aluminum phosphate micro-capsule (AM), silica micro-capsule (SiM), and grafted epoxidized monoglyceride of tung oil on the surface of SiO2(SiE), which were designed and introduced into the RPUF. Because of the PTOK with a catalytic function, the foaming process of some RPUF samples was catalyst-free. The results show that the incorporation of AM, SiM, and SiE, respectively, endow RPUF with a better thermal stability at a high temperature, and theT5%,Tmax1, andTmax2of RPUF appeared to be reduced, however, theTmax3and residue rate at 800 °C were improved, which may have a positive effect on the extension of the rescue time in case of fire, and the limiting oxygen index (LOI) value was increased to 22.6%. The formula, containing 25% PTOK made the RPUF environment-friendly. The results were obtained by comparing the pore size and mechanical properties of the RPUF—the AM had a better dispersion in the foam, and the foam obtained a better mechanical, thermal, and flame retardancy.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 4
·447
·
IF 3.236
Yingxiang Ma,Dan Jiang,Yuping Yang,Li Ma,Jian Zhou,Guosheng Huang
In this study, the urea-formaldehyde (UF)-tung oil solution of phenolic amide (PA) microcapsules to realize anti-fouling and anti-corrosion integration was synthesized by the in situ polymerization method. The compounds and structures were optimized by investigating six kinds of different emulsifiers. The results showed that high-core-content and narrow-particle-size-distribution microcapsules could be synthesized with sodium dodecyl benzene sulfonate (SDBS)/polyvinyl alcohol (PVA), and the core content of the microcapsules was 75 wt% at microcapsule sizes from 24.07 to 71.33 µm. The results of self-healing coatings showed that when the content of microcapsules in the coating exceeded 10 wt%, the healing agent released from the scratched surface could cover the naked metal effectively, which could pass a 7 day neutral salt spray test without rust at the scratched area. A sufficient dose anti-fouling agent can be provided to prevent diatoms and mussels from adhering. The present work shows that the complex emulsifier can better control the particle size distribution and microstructure of the microcapsules, and the admixture of the microcapsules into the resin epoxy coating can realize excellent anti-corrosion and anti-fouling functions.Keywords:self-healing;microcapsules;anti-corrosion;anti-fouling
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
Journal of Energy Storage
·
2023
·
IF 9.4
Guijing Dou,Mengmiao Xu,Yahao Hu,Yiheng Sun,Hanyang Jiang,Guangjian Peng
Microcapsules containing phase change materials (MPCMs) can be integrated with polymeric matrices to develop intelligent thermoregulating composites for applications in temperature management and thermal energy storage . However, the mechanical properties of such composites can be severely compromised due to the weak interfacial adhesion and the poor microcapsule rupture strength . This paper aims to investigate the failure mode of microcapsule/epoxy composites and present corresponding implementable methods to improve their strength. The MPCMs/epoxy composite primarily fails due to poor microcapsule-matrix interface debonding resulting from the poor compatibility between MPCMs and epoxy resin. A silane coupling agent (EPTMS) was employed to modify the surface of MPCMs, forming E-MPCMs, and created a crosslinked interface network during the epoxy curing process. The tensile strength of composite containing 20 wt% E-MPCMs has been improved by 23.55 % while the failure mode switching to microcapsule rupture. Furthermore, the microcapsule shell enhanced by TiO 2 nano-reinforcements achieves a 105.20 % improvement in microcapsule rupture strength. The incorporation of EPTMS modified TiO 2 -MF hybrid microcapsules (ET-MPCMs) resulted in a significant increase of 33.79 % in the tensile strength of ET-MPCMs/epoxy composite with the failure mode changing to microcapsule-matrix interface debonding again. The strategy of alternately enhancing subset properties derived from the competition failure mode of the composite opens new perspectives for the preparation of high-performance multifunctional composites.
研究领域:
材料科学
·
复合材料
·
热能存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Bioresources and Bioproducts
·
2020
·
IF 0
Xiaohua Yang,Shouhai Li,Jiujuan Yan,Jianling Xia,Lixin Huang,Mei Li,Haiyang Ding,Lina Xu
Spray drying was used to produce microencapsulated Wilson's dogwood ( Swida wilsoniana ) oil. The influences of the emulsifier and wall materials on the encapsulation were studied in order to produce high quality encapsulated S. wilsoniana oil. The emulsions were prepared by using lecithin (L) and Tween 80 (T) with different hydrophilic-lipophilic balance. Results indicated that the stable emulsion was obtained using T and L as the compound emulsifier at a ratio of 4/6 (w/w). By virtue of the compound emulsifier (T/L 4/6), the microencapsulation efficiency (MEE) reached 91%, and the oil loading up to 35% was achieved. We also examined the influence of the wall materials on the microencapsulation of S. wilsoniana oil. All the three wall materials exhibited high MEE (> 85%), and the highest MEE (95.20%) was obtained with sodium caseinate/lactose. All the S. wilsoniana oil encapsulated with the three wall materials exhibited nearly spherical microcapsules without pores or cracks, thus protecting the oil from oxygen.
研究领域:
食品科学
·
化学工程
·
材料科学
✓ 已验证
DOI
ACS Biomaterials Science & Engineering
·
2019
·
IF 4.511
Yufang Li,Kashan Memon,Yuanyuan Zheng,Yue Cheng,Momoh Karmah Mbogba,Peitao Wang,Xilin Ouyang,Gang Zhao
Vitrification has become one of the promising cryopreservation methods for biosamples including cells and tissues because the vitreous state reduces the damage of ice crystals to cells. However, besides extremely high cooling rates, routine vitrification protocols require a high concentration of penetrating cryoprotectants (pCPAs, ∼6–8 M), which is toxic for cells and brings trouble when removing pCPAs. Therefore, reducing the concentration of toxic pCPAs in vitrification remains a challenge, and advanced strategies are urgently needed. Hydrogel encapsulation has become one effective method to achieve low-cryoprotectant (CPA) concentration preservation of stem cells with rapid cooling, but there are very few related studies about endothelial cells (ECs). In this study, we achieved pCPA concentration (up to 3 M) vitrification by encapsulating human umbilical vein endothelial cells (HUVECs) into core–shell alginate hydrogel microcapsules. Alginate encapsulation increased HUVEC cryosurvival up to 80%, which is 60% improvement compared to control without encapsulation. Furthermore, two different sizes of capsules (diameter: ∼900 and 400 μm) were produced to explore the effects of microcapsule volume on the cell preservation results, and it was found that larger capsules (∼900 μm) have no significant effect on cell survival while improving encapsulation efficiency. This encapsulation method provides a new strategy for EC preservation and serves as an improvement to optimize the preservation of biosamples.
研究领域:
生物技术
·
低温生物学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2022
·Vol. 12
·期 9
·1246
·
IF 3.236
Pan Pan,Xiaoxing Yan,Wenting Zhao
In this paper, photochromic and thermochromic microcapsules were selected. There are three different coating processes: “the primer with the photochromic microcapsules, the topcoat with the thermochromic microcapsules”, “the primer with the thermochromic microcapsules, the topcoat with the photochromic microcapsules”, and “the photochromic and thermochromic microcapsules added into the primer and topcoats” to explore the color-changing effect of the coating on the surface of basswood (Tilia) and the comprehensive properties of the paint film. The optical properties, mechanical properties, cold liquid resistance, and aging resistance of the coating were mainly analyzed. It was concluded that the comprehensive performance of the coating was the best when thermochromic and photochromic microcapsules were mixed on the surface of basswood (Tilia). At a temperature of 80 °C, the color difference reached a maximum of 20.2, and the coating was completely discolored. The color difference of the coating after discoloration under visible light illumination was 56.9. The gloss under the angle of incidence at 60° was 37.4, hardness was 3H, adhesion grade was 1, impact resistance was 10.0 kg·cm, and cold liquid resistance grade was 1. The method of mixing the two microcapsules had better aging resistance. In this paper, the photochromic and thermochromic properties of the coating were studied, and the optimal discoloration of the surface coating of the basswood substrate was solved by different coating processes. This study provided a method for a coating to achieve both photochromic and thermochromic discoloration, broadening the application of discoloration coatings.Keywords:coating process;discoloration;microcapsules;paint film performance
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
THERMOCHIMICA ACTA
·
2025
·
IF 3.5
Xiangyun Kong,Jinge Lu,Mengkun Xu,Mengyuan Song,Keqing Li,Wenshuai Qiu,Jiali Zhang,Xi Chen,Yongxin Liu
A novel and simple one-step method was proposed for the preparation of multifunctional microencapsulated phase change materials to satisfy the requirements of different application scenarios. Here, with the help of the super reaction ability and coordination effect of metal ions Zn 2+ , the paraffin (PCM) was well encapsulated by the sodium alginate (SA) shell by the cross-linking between SA and Zn 2+ . At the same time, Na 2 S·9H 2 O and 2-MeIM were selected to realize the loading of ZnS quantum dots and ZiF-8 in the materials by their coordination with excess Zn 2+ in the system. The results of differential scanning calorimeter (DSC), Ultraviolet-visible-near-infrared (UV–vis-NIR), Photoluminescence and Brunauer–Emmett–Teller (BET) indicated that the obtained PCM@SA/ZnS and PCM@SA/ZiF-8 not only retained good heat resistance and heat storage properties, but also had new functions such as fluorescence and adsorption. This work would provide a new idea for the development of multi-functional composite materials.
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
危险品化学品经营许可证（带存储）