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Performance and Application of Double-layered Microcapsule Corrosion Inhibitors
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作者 余海燕 WANG Yingxiang +2 位作者 WANG Ruizhi HU Lintong WANG Tianlei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2024年第4期845-853,共9页
Double-layered microcapsule corrosion inhibitors were developed by sodium monofluorophosphate as the core material,polymethyl methacrylate as the inner wall material,and polyvinyl alcohol as the outer wall material co... Double-layered microcapsule corrosion inhibitors were developed by sodium monofluorophosphate as the core material,polymethyl methacrylate as the inner wall material,and polyvinyl alcohol as the outer wall material combining the solvent evaporation method and spray drying method.The protection by the outer capsule wall was used to prolong the service life of the corrosion inhibitor.The dispersion,encapsulation,thermal stability of microcapsules,and the degradation rate of capsule wall in concrete pore solution were analyzed by ultra-deep field microscopy,scanning electron microscopy,thermal analyzer,and sodium ion release rate analysis.The microcapsules were incorporated into mortar samples containing steel reinforcement,and the effects of double-layered microcapsule corrosion inhibitors on the performance of the cement matrix and the actual corrosion-inhibiting effect were analyzed.The experimental results show that the double-layered microcapsules have a moderate particle size and uniform distribution,and the capsules were completely wrapped.The microcapsules as a whole have good thermal stability below 230 ℃.The monolayer membrane structure microcapsules completely broke within 1 day in the simulated concrete pore solution,and the double-layer membrane structure prolonged the service life of the microcapsules to 80 days in the simulated concrete pore solution before the core material was completely released.The mortar samples containing steel reinforcement incorporated with the double-layered microcapsule corrosion inhibitors still maintained a higher corrosion potential than the monolayer microcapsule corrosion inhibitors control group at 60 days.The incorporation of double-layered microcapsules into the cement matrix has no significant adverse effect on the setting time and early strength. 展开更多
关键词 corrosion inhibitors microcapsule double-layer structure potentiodynamic polarization curve
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High-throughput microfluidic production of carbon capture microcapsules:fundamentals,applications,and perspectives
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作者 Xiangdong Liu Wei Gao +2 位作者 Yue Lu Liangyu Wu Yongping Chen 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2024年第3期330-361,共32页
In the last three decades,carbon dioxide(CO_(2)) emissions have shown a significant increase from various sources.To address this pressing issue,the importance of reducing CO_(2) emissions has grown,leading to increas... In the last three decades,carbon dioxide(CO_(2)) emissions have shown a significant increase from various sources.To address this pressing issue,the importance of reducing CO_(2) emissions has grown,leading to increased attention toward carbon capture,utilization,and storage strategies.Among these strategies,monodisperse microcapsules,produced by using droplet microfluidics,have emerged as promising tools for carbon capture,offering a potential solution to mitigate CO_(2) emissions.However,the limited yield of microcapsules due to the inherent low flow rate in droplet microfluidics remains a challenge.In this comprehensive review,the high-throughput production of carbon capture microcapsules using droplet microfluidics is focused on.Specifically,the detailed insights into microfluidic chip fabrication technologies,the microfluidic generation of emulsion droplets,along with the associated hydrodynamic considerations,and the generation of carbon capture microcapsules through droplet microfluidics are provided.This review highlights the substantial potential of droplet microfluidics as a promising technique for large-scale carbon capture microcapsule production,which could play a significant role in achieving carbon neutralization and emission reduction goals. 展开更多
关键词 carbon capture microcapsuleS droplet microfluidic high-throughput production carbon neutralization
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MXene confined microcapsules for uremic toxins elimination
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作者 Xiaomin Ye Chaoyu Yang +3 位作者 Li Wang Qihui Fan Luoran Shang Fangfu Ye 《Aggregate》 EI CAS 2024年第4期236-244,共9页
Adsorbents with high adsorption efficiency and excellent biosafety for biomedical applications are highly required.MXene is a promising candidate owning these advantages,yet pristine MXene faces dilemmas including insu... Adsorbents with high adsorption efficiency and excellent biosafety for biomedical applications are highly required.MXene is a promising candidate owning these advantages,yet pristine MXene faces dilemmas including insufficient utility of sur-face site as well as limited processibility.Here,we develop MXene-encapsulated porous microcapsules via microfluidics.The microcapsules have a biomass hydrogel shell that provides robust support for MXene in the core,by which the microcapsules are endowed with high MXene dosage and remarkable biosafety.Additionally,the MXene nanoflakes assemble into a three-dimensional network via metal ion-induced gelation,thereby avoiding restacking and significantly improving surface utiliza-tion.Moreover,a freeze-pretreatment of the microcapsules during preparation results in the formation of a macroporous structure in the shell,which can facilitate the diffusion of the target molecules.These features,combined with additional magneto-responsiveness rendered by the incorporation of magnetic nanoparticles,contribute to prominent performances of the microcapsules in cleaning uremia toxins including creatinine,urea,and uric acid.Thus,it is anticipated that the MXene-encapsulated microcapsules will be promising adsorbents in dialysis-related applications,and the combination of microfluidic encapsulation with metal ion gelation will provide a novel approach for construction of hybrid MXene materials with desired functions. 展开更多
关键词 ADSORPTION microcapsuleS microfluidics MXene uremic toxins
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Research Progress of Aromatic Bed Curtains for Aiding Sleep Based on Lavender Microcapsule Technique
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作者 Xiaojun LUO Xuan PAN +3 位作者 Kaiyan QIU Ken HUANG Yao LU Jingjing LI 《Agricultural Biotechnology》 2024年第2期64-67,71,共5页
In this paper, the preparation technique of lavender essential oil microcapsules and the construction method of aromatic textiles were expounded, and the research status of bed curtains and lavender microcapsules at h... In this paper, the preparation technique of lavender essential oil microcapsules and the construction method of aromatic textiles were expounded, and the research status of bed curtains and lavender microcapsules at home and abroad was analyzed and studied from the perspective of application in textiles. The application of lavender essential oil to bed curtains through the microcapsule technique was put forward to allow lavender essential oil to play its role of helping sleep in bed curtains. This paper expounded the material selection and preparation technique of lavender microcapsule agents, and put forward the preparation method of microcapsules with mixed solutions of pure Chinese medicine extracts and natural essences as core material and high-viscosity epoxy resin as wall materials. The post-processing techniques and the spray ironing method for clothing were studied and developed, and these techniques and methods were applied to bed curtains, and good results were obtained. 展开更多
关键词 LAVENDER Sleep aid Aromatic bed curtain microcapsule
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Antibacterial Chitosan-Gelatin Microcapsules Modified with Green-Synthesized Silver Nanoparticles for Food Packaging 被引量:3
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作者 Long Li Yanan Lu +3 位作者 Yu Chen Jiayi Bian Li Wang Li Li 《Journal of Renewable Materials》 SCIE EI 2023年第1期291-307,共17页
Silver nanoparticles(Ag NPs)are an effective antibacterial agent,but their application in food packaging is limited due to their easy agglomeration and oxidation.In this study,antibacterial microcapsules were fabricat... Silver nanoparticles(Ag NPs)are an effective antibacterial agent,but their application in food packaging is limited due to their easy agglomeration and oxidation.In this study,antibacterial microcapsules were fabricated using Ginkgo biloba essential oil(GBEO)as core material and chitosan and type B gelatin biopolymer as capsule mate-rials.These antibacterial microcapsules were then modified with green-synthesized Ag NPs,blended into the bio-polymer polylactic acid(PLA),and finally formed as films.Physicochemical properties and antibacterial activity against Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus)were evaluated.Results showed that the prepared antibacterial PLA films exhibited excellent antibacterial activity against foodborne pathogens.Its TVC exceeded the limit value of 7 log CFU/g at 7 days compared with the 5 days of pure PLA films.Therefore,these films can extend the shelf life of grass carp fillets by 2–3 days under refrigeration. 展开更多
关键词 Silver nanoparticles chitosan GELATIN microcapsuleS antibacterial activity food packaging
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Photosensitivity and a precise combination of size-dependent lambda-cyhalothrin microcapsules synergistically generate better insecticidal efficacy
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作者 GAO Yue LUO Jian +5 位作者 SUN Yue ZHANG Hua-wei ZHANG Da-xia LIU Feng MU Wei LI Bei-xing 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2023年第5期1477-1488,共12页
In this study, lambda-cyhalothrin(LC) loaded polyurea microcapsules(MCs) with different particle sizes were fabricated.All of the MCs showed varying degrees of physical collapse, which was more obvious among those wit... In this study, lambda-cyhalothrin(LC) loaded polyurea microcapsules(MCs) with different particle sizes were fabricated.All of the MCs showed varying degrees of physical collapse, which was more obvious among those with smaller particle sizes. MCs with particle sizes of 1.38 μm(MC-S), 5.13 μm(MC-M) and 10.05 μm(MC-L) had shell thicknesses of 39.6,50.3 and 150.1 nm, respectively. MCs with smaller particles tended to have significantly faster release profiles, and the MC-S group had much higher bioactivity against Agrotis ipsilon and better foliar affinity on the peanut leaves(indicated by rainfastness) than MC-M and MC-L. All of the MCs exhibited light-enhanced release profiles and had much slower degradation compared with the emulsifiable concentrate(EC) group, among which MC-L had the slowest degradation.To generate MCs with both favorable quick efficacy and long-lasting efficacy, binary mixtures of MC-S, MC-M and MC-L were produced by mixing them in pairs at ratios of 2:1, 1:1 and 1:2. The mixture of MC-S:MC-L at 1:2 showed the best comprehensive efficacy in the peanut foliar spray scenario among the nine tested combinations, and its effective duration was three times longer than that of EC. Overall, the precise combination of MCs with different particle sizes can regulate the efficacy of pesticide control and serve as a strategy for the better utilization of pesticides. 展开更多
关键词 POLYUREA microcapsuleS size CONTROL COMBINATION strategy pest CONTROL initial and long-term EFFICACY
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Evaluation of Self-Healing Efficiency of Microcapsule-Based Self-Healing Cementitious Composites Based on Acoustic Emission
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作者 Wenfeng Hao Hao Hao +1 位作者 Humaira Kanwal Shiping Jiang 《Journal of Renewable Materials》 SCIE EI 2023年第4期1687-1697,共11页
Microcapsule self-healing technology is one of the effective methods to solve the durability problem of cementbased composites.The evaluation method of the self-healing efficiency of microcapsule self-healing cement-b... Microcapsule self-healing technology is one of the effective methods to solve the durability problem of cementbased composites.The evaluation method of the self-healing efficiency of microcapsule self-healing cement-based composites is one of the difficulties that limits the self-healing technology.This paper attempts to characterize the self-healing efficiency of microcapsule self-healing cement-based composites by acoustic emission(AE)parameters,which provides a reference for the evaluation of microcapsule self-healing technology.Firstly,a kind of self-healing microcapsules were prepared,and the microcapsules were added into the cement-based composites to prepare the compression samples.Then,the specimen with certain pre damage was obtained by compression test.Secondly,the damaged samples were divided into two groups.One group was directly used for compression tests to obtain the damage failure process.The other group was put into water for healing for 30 days,and then compression tests were carried out to study the influence of self-healing on the compression failure process.During the experiments,the AE signals were collected and the AE characteristics were extracted for the evaluation of self-healing efficiency.The results show that the compression pre damage test can trigger the microcapsule,and the compression strength of the self-healing sample is improved.The failure mechanism of microcapsule selfhealing cement-based composites can be revealed by the AE parameters during compression,and the self-healing efficiency can be quantitatively characterized by AE hits.The research results of this paper provide experimental reference and technical support for the mechanical property test and healing efficiency evaluation of microcapsule self-healing cement-based composites. 展开更多
关键词 Self-healing efficiency cementitious composites microcapsuleS acoustic emission compressive property
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Preparation of Poly-α-Olefin Microcapsule Particles Coated with Polyurethane as a Drag Reducer Based on Interface Polymerization
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作者 Li Chenhao Lu Yong +6 位作者 Li Hao Chen Yue Meng Yeqiao Zhou Pengfei Xu Dan Wang Yiran Zhang Xiaolai 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2023年第2期101-112,共12页
The molecular behavior of polyurethane(PU)coating materials during the surface adsorption of poly-α-olefin as a drag reducing polymer was explored by a molecular dynamics simulation.Three different PU capsule wall ma... The molecular behavior of polyurethane(PU)coating materials during the surface adsorption of poly-α-olefin as a drag reducing polymer was explored by a molecular dynamics simulation.Three different PU capsule wall materials were synthesized using two reaction monomers,and a poly-α-olefin/PU drag reducer microcapsule was prepared based on interface polymerization.The structure,morphology,thermal stability,compressive strength,and drag reduction performance of the microcapsules were characterized and compared.The results showed that a non-bonding interaction induced the adsorption of the PU coating material,poly-α-olefin and PU then fused at the interface,and the PU coating material was embedded into the inner grooves of poly-α-olefin in the form of a local mosaic,thereby forming a stable core–shell structure.The morphological characterization indicated that PU and poly-α-olefin could form microcapsule structures.The thermal decomposition temperature of the microcapsule was dependent on the type of capsule wall material.The microcapsule structure had a slight effect on poly-α-olefin drag reduction.The system enabled poly-α-olefin to exist in powdered particles through microcapsulation,and had a good dispersion effect that facilitated storage and transport processes.The method effectively inhibited the accumulation and bonding of poly-α-olefin at room temperature. 展开更多
关键词 drag reducer poly-α-olefin POLYURETHANE microcapsules particles interfacial polymerization
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RP-HPLC determination of lycopene in microcapsules 被引量:2
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作者 卢定强 陆晓云 +1 位作者 陆凯丰 胡继军 《Journal of Chinese Pharmaceutical Sciences》 CAS 2007年第1期65-68,共4页
Aim A RP- HPLC method for determination of lycopene in microcapsules was established. Methods The HPLC assay was performed on an Alltima Cls (4.6 mm × 250 mm, 5μm) column with a mixture of methanol-THF-water ... Aim A RP- HPLC method for determination of lycopene in microcapsules was established. Methods The HPLC assay was performed on an Alltima Cls (4.6 mm × 250 mm, 5μm) column with a mixture of methanol-THF-water (66:30:4, V/V/V) as mobile phase at a flow rate of 1.5 mL·min^-1 and the UV detection wavelength was 472 nm. Results The linear range of lycopene was 3.6-18 μg·mL^-1, r = 0.999 8, the average recovery was from 99.81% to 101.06% with RSD less than 1.83%. The RSD of intra-day and interday precision were less than 3.34%. Conclusion The method is simple, accurate and suitable for the determination of lycopene in microcapsules. 展开更多
关键词 RP-HPLC LYCOPENE microcapsuleS
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Preparation and in Vitro Evaluation of Polylactic Acid (PLA) or Polylactic-co-Glycolic Acid (PLGA) Microcapsules Loaded with Estradiol 被引量:1
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作者 周新腾 朱峰 +2 位作者 潘卫三 王磊 张汝华 《Journal of Chinese Pharmaceutical Sciences》 CAS 2003年第2期87-92,共6页
Aim PLA/PLGA was used as biodegradable and biocompatible carriers to achieve sustained release of estradiol (E 2). Methods Microcapsules (MC) were prepared by an emulsification solvent extraction method, and then ... Aim PLA/PLGA was used as biodegradable and biocompatible carriers to achieve sustained release of estradiol (E 2). Methods Microcapsules (MC) were prepared by an emulsification solvent extraction method, and then the properties and in vitro drug release behavior of MC were examined. An analysis of variance (ANOVA) was used to test the statistical significance. Then, multiple comparisons were made with a T method between levels to examine the significance of difference further. For all the results a P value 】0 05 was considered statistically insignificant . Results Under the same conditions, the water adding speed and the particle size had significant effects ( P 【0 01) on the entrapment efficiency of MC; the water adding speed and the concentration of PLA in the oil phase had significant effects ( P 【0 01) on the diameter MC in medium. Release of E 2 from MC was influenced significantly ( P 【0 01) by the water adding speed and the type and molecule weight of the polymers. But the differences between levels of the variates were not all significant. Conclusion E 2 PLA/PLGA MC with various properties can be formed when the formulation and the technology were changed accordingly. 展开更多
关键词 microcapsuleS ESTRADIOL PLA PLGA emulsification solvent extraction
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Microstructure and deposition mechanism of electrodeposited Cu/liquid microcapsule composite 被引量:2
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作者 徐秀清 朱立群 +1 位作者 李卫平 刘慧丛 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第10期2210-2215,共6页
The nanostructured copper/microcapsule containing liquid core materials composite(copper/liquid microcapsules composite) was prepared using direct current(DC) electrodeposition method.The surface morphology and mi... The nanostructured copper/microcapsule containing liquid core materials composite(copper/liquid microcapsules composite) was prepared using direct current(DC) electrodeposition method.The surface morphology and microstructure of composite were investigated by means of scanning electron microscopy(SEM),transmission electron microscopy(TEM) and X-ray diffraction(XRD).The results show that the microstructure of electrodeposited layer transformed from bulk crystal to nano structure because of the participation of microcapsules.The diameters of microcapsules and the copper grain sizes in the composite were 2?20 μm and 10?20 nm,respectively.In addition,the electrodeposition mechanism of composite in the deposition process followed electrochemistry theory,which was proved by the theoretical analysis result and the experiment results.Meanwhile,the co-deposition process model was presented. 展开更多
关键词 copper/liquid microcapsule composite DC electrodeposition NANOSTRUCTURE electrodeposition mechanism
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Synthesis and Characterization of Microcapsules with Chlorpyrifos Cores and Polyurea Walls 被引量:19
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作者 ZHANG Qiang ZHANG Pei-pei JIAO Qing-ze 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2006年第3期379-382,共4页
Microcapsules with chlorpyrifos cores and polyurea walls were synthesized with 2,4-tolylene diisocyanate as an oil-soluble monomer and ethylenediamine as a water-soluble monomer via an interracial polycondensation rea... Microcapsules with chlorpyrifos cores and polyurea walls were synthesized with 2,4-tolylene diisocyanate as an oil-soluble monomer and ethylenediamine as a water-soluble monomer via an interracial polycondensation reaction. The products were characterized by means of Fourier transform infrared spectrometry, ^13C NMR spectrometry and ^31p NMR spectrometry. The morphology, the particle size and the particle size distribution, and the thermal properties were also evaluated. The prepared microcapsules exhibit clear and smooth surfaces and have a mean diameter of 28. 13 μm. These microcapsules also have a good thermal stability for long-term use, and have potential applications in minimizing the toxicity of chlorpyrifos through controlled release. 展开更多
关键词 microcapsule CHLORPYRIFOS POLYUREA SYNTHESIS Characterization
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Measurement and Influence Factors of the Flowability of Microcapsules with High-content β-Carotene 被引量:12
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作者 许新德 姚善泾 +1 位作者 韩宁 邵斌 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2007年第4期579-585,共7页
The flowability of five kinds of microencapsulation powders,with differentβ-carotene contents and by two alternative particle-forming technologies i.e.spray-drying and starch-catching beadlet technology,was meas- ure... The flowability of five kinds of microencapsulation powders,with differentβ-carotene contents and by two alternative particle-forming technologies i.e.spray-drying and starch-catching beadlet technology,was meas- ured.The actual flow properties of the five powders were compared based on bin-flow test,and three flow indexes (Hausner ratio,repose angle and flow index)were measured.It was found that the repose angle is the most suitable index to reflect the flowability of these powders for the particle properties would not be altered due to compaction or tapping during the measuring process.Particle size and particle size distribution play most important roles in the flowability of these granular materials,which was also influenced by other factors like shape,surface texture,sur- face roughness,etc.Microcapsules with wall material of gelatin and a layer of modified starch absorbed on the sur- face showed excellent flowabilities and good mechanical properties,and they are favorable for tabletting to supply β-carotene. 展开更多
关键词 Β-CAROTENE microcapsule powders FLOWABILITY Hausner ratio repose angle
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Biomass Microcapsules with Stem Cell Encapsulation for Bone Repair 被引量:10
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作者 Lei Yang Yuxiao Liu +3 位作者 Lingyu Sun Cheng Zhao Guopu Chen Yuanjin Zhao 《Nano-Micro Letters》 SCIE EI CAS CSCD 2022年第1期95-106,共12页
Bone defects caused by trauma,tumor,or osteoarthritis remain challenging due to the lack of effective treatments in clinic.Stem cell transplantation has emerged as an alternative approach for bone repair and attracted... Bone defects caused by trauma,tumor,or osteoarthritis remain challenging due to the lack of effective treatments in clinic.Stem cell transplantation has emerged as an alternative approach for bone repair and attracted widespread attention owing to its excellent biological activities and therapy effect.The attempts to develop this therapeutic approach focus on the generation of effective cell delivery vehicles,since the shortcomings of direct injection of stem cells into target tissues.Here,we developed a novel core-shell microcapsule with a stem cell-laden core and a biomass shell by using all-aqueous phase microfluidic electrospray technology.The designed core-shell microcapsules showed a high cell viability during the culture procedure.In addition,the animal experiments exhibited that stem cell-laden core-shell microcapsules have good biocompatibility and therapeutic effect for bone defects.This study indicated that the core-shell biomass microcapsules generated by microfluidic electrospray have promising potential in tissue engineering and regenerative medicine. 展开更多
关键词 microcapsule Bone repair Stem cell therapy MICROFLUIDICS ELECTROSPRAY
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Research on microcapsules of phase change materials 被引量:8
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作者 DAI Xia SHEN Xiaodong 《Rare Metals》 SCIE EI CAS CSCD 2006年第z1期393-399,共7页
Microcapsule technology is a kind of technology wrapping the solid or liquid into minute-sized particles within the field of micrometer or millimeter with film forming materials. This thesis introduces microcapsule te... Microcapsule technology is a kind of technology wrapping the solid or liquid into minute-sized particles within the field of micrometer or millimeter with film forming materials. This thesis introduces microcapsule technology of phase change materials and its main functions and the structural composition, preparation methods and characterization technology of microcapsule of phase change materials. The microcapsule of phase change materials is small in size and its temperature remains unchanged during the process of heat absorption and heat release. It is of great value in research and application prospect due to these characteristics. 展开更多
关键词 phase change material microcapsule phase change material surface polymerization PREPARATION
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An enzyme-loaded reactor using metal-organic framework-templated polydopamine microcapsule 被引量:5
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作者 Jing Wang Yongqin Lv 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第1期317-325,共9页
Ultrathin polydopamine microcapsules with hierarchical structure and porosity were prepared for the immobilization of multienzymes using metal-organic framework(MOF) as the template.The multienzyme/MOF composite was f... Ultrathin polydopamine microcapsules with hierarchical structure and porosity were prepared for the immobilization of multienzymes using metal-organic framework(MOF) as the template.The multienzyme/MOF composite was first prepared using a "one-pot" co-precipitation approach via the coordination and self-assembly of zinc ions and 2-methylimidazole in the presence of enzymes.The obtained nanoparticles were then coated with polydopamine thin layer through the self-polymerization of dopamine under alkaline condition.The polydopamine microcapsules with an ultrathin shell thickness of ~48 nm were finally generated by removing the MOF template at acidic condition.Three enzymes were encapsulated in PDA microcapsules including carbonic anhydrase(CA),formate dehydrogenase(FateDH),and glutamate dehydrogenase(GDH).FateDH that catalyzed the main reaction of CO_(2) reduction to formic acid retained 94.7% activity of equivalent free FateDH.Compared with free multienzymes,the immobilized ones embedded in PDA microcapsules exhibited 4.5-times higher of formate production and high catalytic efficiency with a co-factor-based formate yield of 342%. 展开更多
关键词 BIOCATALYSIS ENZYME IMMOBILIZATION microcapsule Metal-organic framework Template
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Preparation and characterization of hexadecane microcapsule with polyurea-melamine formaldehyde resin shell materials 被引量:5
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作者 Gao, Gui Bo Qian, Chun Xiang Gao, Min Jie 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第5期533-537,共5页
This paper gives a brief report of the preparation of hexadecane microcapsule with polyurea-melamine formaldehyde resin shell materials(HMPM).The sealing performance and thermal stability of HMPM was enhanced much mor... This paper gives a brief report of the preparation of hexadecane microcapsule with polyurea-melamine formaldehyde resin shell materials(HMPM).The sealing performance and thermal stability of HMPM was enhanced much more effectively than that of microcapsule with polyurea shell material(HPM).The results of microscopical imaging analysis system,DSC,TG,and laser particle analyzer were briefly introduced. 展开更多
关键词 HEXADECANE POLYUREA Melamine formaldehyde resin microcapsule Phase change properties
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Numerical Analysis on Thermal Function of Clothing with PCM Microcapsules 被引量:4
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作者 LIU Wenyi LI Fengzhi LIU Weihua 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2019年第2期320-329,共10页
To study the influences of phase change material(PCM)microcapsules in clothing on human thermal responses,a mathematical model is developed.The improved Stolwijk’s model is used to simulate human thermo-regulatory pr... To study the influences of phase change material(PCM)microcapsules in clothing on human thermal responses,a mathematical model is developed.The improved Stolwijk’s model is used to simulate human thermo-regulatory process,and the coupled heat and moisture transfer including the moisture sorption/desorption of fibers and effects of phase transition temperature range on the phase change processes of the PCM is considered in clothing model.Meanwhile,the theoretical predictions are validated by experimental data.Then,the interactions between human body thermal responses and the heat and moisture transfer in clothing are discussed by comparing the prediction results with PCMs and without PCMs.Also the effects of fiber hygroscopicity on clothing and human thermal responses are compared.The conclusion shows that the clothing with PCMs microcapsules can delay the human temperature variations and decrease the sweat accumulation rate on the skin surface and heat loss during changing of ambient conditions,and fiber hygroscopicity reduces the effect of PCM microcapsules on delaying garment temperature variations very significantly. 展开更多
关键词 PCM microcapsule porous TEXTILES heat and MOISTURE transfer numerical simulation human thermoregulatory model
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Culture of yeast cells immobilized by alginate-chitosan microcapsules in aqueous-organic solvent biphasic system 被引量:5
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作者 HOU Dandan YU Weiting +3 位作者 ZHANG Demeng ZHAO Lili LIU Xiudong MA Xiaojun 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2019年第3期863-870,共8页
Immobilization biocatalysis is a potential technology to improve the activity and stability of biocatalysts in nonaqueous systems for efficient industrial production.Alginate-chitosan(AC)microcapsules were prepared as... Immobilization biocatalysis is a potential technology to improve the activity and stability of biocatalysts in nonaqueous systems for efficient industrial production.Alginate-chitosan(AC)microcapsules were prepared as immobilization carriers by emulsifi cation-internal gelation and complexation reaction,and their contribution on facilitating the growth and metabolism of yeast cells were testifi ed successfully in culture medium-solvent biphasic systems.The cell growth in AC microcapsules is superior to that in alginate beads,and the cells in both immobilization carriers maintain much higher activity than free cells,which demonstrates AC microcapsules can confer yeast cells the ability to resist the adverse effect of solvent.Moreover,the performance of AC microcapsules in biphasic systems could be improved by adjusting the formation of outer polyelectrolyte complex(PEC)membrane to promote the cell growth and metabolic ability under the balance of resisting solvent toxicity and permitting substrate diffusion.Therefore,these findings are quite valuable for applying AC microcapsules as novel immobilization carriers to realize the biotransformation of value-added products in aqueous-solvent biphasic systems. 展开更多
关键词 alginate-chitosan(AC)microcapsules immobilization BIOCATALYSIS aqueous-solvent BIPHASIC system cell growth
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Synthesis of melamine-formaldehyde microcapsules containing oil-based fragrances via intermediate polyacrylate bridging layers 被引量:3
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作者 Yanping He Shunzhi Yao +5 位作者 JunzhengHao HongWang Linhua Zhu TianSi Yanlin Sun Jianhao Lin 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第10期2574-2580,共7页
A general and versatile strategy to prepare melamine-formaldehyde(MF)microcapsules encapsulating oil-based fragrances by combining solvent evaporation and in situ polymerization was proposed in this work.The oil-based... A general and versatile strategy to prepare melamine-formaldehyde(MF)microcapsules encapsulating oil-based fragrances by combining solvent evaporation and in situ polymerization was proposed in this work.The oil-based fragrance was pre-encapsulated by an inner polyacrylate membrane via solvent evaporation,followed by in situ polymerization of MF precondensates as an outer shell.The polyacrylate membrane is used as an intermediate bridging layer to stabilize the oil-based fragrance,and to provide driving forces for in situ polymerization of MF precondensates through electrostatic attractions between carboxyl groups and ammonium ions.It was demonstrated that MF microcapsules containing clove oil were prepared successfully.The amount and the composition of the intermediate polyacrylate bridging layer were critical.Smooth and sphere-shaped MF-clove oil microcapsules were prepared when the weight ratio of polyacrylate to clove oil was over 60 wt%and the concentration of acrylic acid(AA)increased to 10 wt%in polyacrylate.In addition,MF microcapsules containing sunflower oil and hexyl salicylate were prepared by using this method.The work suggests that this new approach can be potentially used to encapsulate various core materials,tuning the shell properties of microcapsules such as thickness,mechanical strength and release properties. 展开更多
关键词 Melamine formaldehyde microcapsule OIL-BASED FRAGRANCE Particle Polymers Synthesis
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