ENERGY
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2019
·
IF 5.537
Songlin Li,Beibei Dong,Jinghang Wang,Juan Li,Tongtong Shen,Hao Peng,Xiang Ling
The purpose of this study was to synthesize microencapsulated phase change materials (MEPCMs) with C 12 -C 14 binary alkanes as phase change materials (PCMs) and melamine-formaldehyde resins (MF resins) as shell materials by in-situ polymerization. SDS, Span80 and Tween80 were used as the compound emulsifiers . The effects of emulsifier concentrations, core/shell ratio and compound emulsifier Hydrophilic Lipophilic Balance (HLB) value on the performance of MEPCMs were investigated. The morphology, chemical structure, thermodynamic properties and thermal stability of MEPCMs were determined by SEM, FT-IR, DSC and TGA. Results show that the emulsifier concentration and HLB value have significant impact on the MEPCMs synthesis. The emulsifier concentration of 8 wt%, HLB value of 12.15 are recommended to obtain the MEPCMs with smoother and more regular morphologies. Generally, the enthalpy and encapsulation efficiency are increasing with the increase of core/shell ratio, and the supercooling degree of MEPCMs increases by increasing the emulsifier concentration. The synthesized MEPCMs present good thermal durability and excellent cycling characteristics during the 100 thermal cycles. Moreover, they also have an appreciable thermal stability and can withstand temperatures no higher than 315 °C.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 16
·48594
·
IF 2.188
Rui Wang,Yao Xiao
In this study, we prepared monosultap microcapsules in an inverse emulsion through interfacial polymerization for the first time. The microcapsules are spherical pellets with intact and smooth shell and have a narrow particle size distribution with an average size of about 2.35 μm. More importantly, our microcapsules have excellent thermal stability with a starting decomposition temperature of 233.1 °C, high encapsulation efficiency of 81.9% as well as long-term slow release of monosultap under different conditions. In addition, the shell of the microcapsules can degrade completely in the natural condition, avoiding the pollution to the environment. It can be believed that our microcapsules will show good service performance if employed in agricultural industry. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48594.
研究领域:
材料科学
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农业科学
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DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 4
·714
·
IF 3.4
Su Liu,Liuxin Shi,Mengyun Liu,Wei Chen,Qiang Cheng,Xiuli Song
In recent years, textiles with antimicrobial properties have attracted more and more attention. As natural antimicrobial agents, essential oils’ potential application value lies in their ability to provide textiles with antimicrobial functions. In this paper, organic solvent extraction (n-hexane, petroleum ether, ethanol) and steam distillation were used to extract saffron petal essential oil (SPEO). It was found that organic solvent extraction (ethanol) had the highest extraction rate and the most apparent bacteriostatic effect. SPEO-Ms were prepared using the composite condensation method with gelatin and chitosan. The microstructure, encapsulation efficiency, slow-release performance, infrared spectrum, and thermal stability of the SPEO-Ms were evaluated. The results showed that the microencapsulated essential oil had good bacteriostatic properties. Antimicrobial cotton fabric was prepared by impregnating microcapsules onto cotton fibers. The effects of the microcapsules’ concentration on the whiteness, air permeability, moisture permeability, and bacteriological inhibition of the fabric were investigated. The results revealed that SPEO-Ms have the potential to be used as a new antimicrobial agent in textiles.Keywords:saffron flower petal essential oil;microcapsule;antimicrobial cotton fabric;cotton fabric
研究领域:
纺织科学
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微生物学
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植物化学
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2015
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IF 5.337
Huanzhi Zhang,Yongjin Zou,Yujia Sun,Lixian Sun,Fen Xu,Jian Zhang,Huaiying Zhou
Phase-change materials (PCMs) have promising applications in the fields of solar energy storage, energy conservation in buildings , thermal insulation , and thermal regulation. In this study, novel multifunctional composite films were prepared via a thermosetting process using poly(vinyl chloride) (PVC) as a film matrix, microencapsulated PCMs (micro-PCMs) as a temperature-regulating additive and TiO 2 nanoparticles (nano-TiO 2 ) as a UV-blocking additive. The latent heat of the film fabricated with 6 wt% micro-PCMs and 6 wt% nano-TiO 2 is 9.226 J/g. The film also shows high thermal stability, with no obvious change in thermal performance after 100 heating–cooling cycles. The temperature of a space enclosed by the film fabricated with 6 wt% micro-PCMs and 6 wt% nano-TiO 2 can be controlled in the range 25–28 °C for 3298 s. The composite films exhibit a significantly decreased UV transmittance due to the UV absorption of nano-TiO 2 . Furthermore, the thermal conductivity of the sample fabricated with 6 wt% micro-PCMs and 6 wt% nano-TiO 2 is 0.2356 W/(m K), which is comparable with that of a pure PVC film. These findings indicate that the novel thermal-insulating film is promising for use in energy-efficient building and automobile applications.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-10
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IF 4.259
Huang Bin Bin,Zhang Shao Fei,Chen Peng Hao,Wu Gang
The dynamics of release and degradation of the microencapsulation formulation containing spinosad (SP) and emamectin benzoate (EM) were evaluated in the present study. SP and EM were microencapsulated using biodegradable poly-lactic acid (PLA) as the wall material. Their release from and degradation within the prepared SP and EM microspheres (SP-EM-microspheres) were studied. It was found that the encapsulation significantly prolonged the insecticide release. The release could be further extended if the external aqueous phase was pre-saturated with the insecticides and the microspheres were additionally coated with gelatin. On the other hand, increasing the water content of the emulsion or the hydrophilic polycaprolactone (PCL) content in the PLA/PCL mixture accelerated the release. Due to the photolysis and hydrolysis of SP and EM by sunlight, the toxicity of the non-encapsulated insecticides in water declined continuously from 0 through the 9 th day (d), and dissipated in 13 d. In contrast, an aqueous suspension containing 5% SP-EM-microspheres maintained a mostly constant toxicity to Plutella xylostella for 17 d. The biodegradable SP-EM-microspheres showed significantly higher long-term toxicity to P. xylostella due to lower release, reduced photolysis and hydrolysis of the encapsulated insecticides, which were affected by the varied preparation conditions.
研究领域:
农药科学
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环境生物学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 18
·6025-6033
·
IF 7.059
Jiaye Xie,Lei Gao,Jun Hu,Qi Li,Jinliang He
Electrical treeing is regarded as the major factor that results in electrical damage of polymer insulation and thus shortens the lifetime and compromises the reliability of electrical power systems and power electronics. In bulk thermoset polymers, which are widely used as electrical insulation, self-healing of the electrical damage caused by treeing has rarely been reported. In this work, self-healing of electrical damage in a thermoset polymer, i.e., epoxy, is achieved through an anionic polymerization-based microcapsule approach. The epoxy matrix is modified with 2-ethyl-4-methylimidazole that initiates anionic polymerization of the healing agents and thereby repairs the electrical tree channels. The anionic polymerization is designed to be favoured in a moderate temperature range that matches with the working condition of many polymer insulation materials in electrical power systems, eliminating the need of additional stimuli that are usually required to trigger the healing reaction. It is substantialized that the electrical tree channels in the self-healing epoxy are re-built once they encounter and rupture the microcapsules, and the dielectric properties are completely recovered. This design of a self-healing material offers new possibilities for smart dielectrics that are needed in future electrical power systems and power electronics with a longer service lifetime and improved reliability.
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2021
·
IF 7.267
Ping Hu,Yang Feng,Qi Li,Chuan-Huang Lin,Yu-Hao Ning,Yi-Ting Li,Lin-Ping Yu,Zhong Cao,Ju-Lan Zeng
Microencapsulation of phase change materials (PCMs) with functional shell materials such as luminescent material could endow the obtained microencapsulated PCMs (MPCMs) with improved latent heat storage properties. The PCM core in turn could protect the luminescence shell from large temperature shifting and thus improve its performance. In this work, a series of MPCMs derived from n -octadecane (ODE) core and CaF 2 shell were synthesized via a self-assembly method. The effects of the preparation conditions, including the core/shell mass ratio, the dosage of the emulsifier (styrene-maleic anhydride copolymer , SMA) and the dosage of the chelator (Na 3 Cit), on the properties of the prepared ODE@CaF 2 MPCMs were investigated and the optimal preparation condition was obtained. The MPCM obtained according to the optimal procedure (MPCM1) exhibited an encapsulation ratio of 54.02% and a latent heat of 131 J/g with negligible leakage. It also possessed excellent thermal reliability and significantly improved thermal conductivity . The MPCM1 could not only be utilized as good latent heat storage material and thermal regulation material, but also provided one new idea to prevent the thermal quenching of luminescence materials. In addition, this work could shed some light on the high-value utilization of recovered fluorine resources.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Coatings
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2022
·Vol. 12
·期 2
·254
·
IF 3.236
Xiuli Song,Liuxin Shi,Su Liu,Chen Hou,Kai Zhu,Qiang Cheng,Luyu Mei
Essential oils are natural antibacterial substances and have potential value for application in fruit and vegetable packaging. In this study, Chinese fir essential oil (CFEO) was microencapsulated to prepare food packaging materials for the first time to overcome its volatilization and oxidation shortcomings and to obtain a sustained-release form of the oil. CFEO was effectively encapsulated in gelatin and chitosan using the complex coacervation method, and the encapsulation efficiency, microstructure, infrared spectrum and thermal stability of the microcapsules were evaluated. Experiments confirmed that the microcapsules had some antibacterial activity. A bioactive paper was developed by combining CFEO microcapsules (CFEO-Ms) with paper-based material using the film-forming property of polyvinyl alcohol (PVA). The coated paper showed good mechanical, air permeability and moisture permeability properties. Environmental scanning electron microscopy confirmed that CFEO-Ms bonded well with PVA and was successfully introduced into the paper fiber after coating, forming an obvious coating film on the surface to facilitate the continuous release of CFEO. The shelf life of strawberries was significantly prolonged when the PVA-coated paper mixed with 3% CFEO-Ms was used for packaging. The results demonstrated that the CFEO-Ms coated paper has the potential to become an effective packaging material for the preservation of strawberries.Keywords:Chinese fir essential oil;microcapsule;coated paper;food packaging;strawberries
研究领域:
食品科学
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材料科学
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产品关联
DOI
高影响因子
Applied Nanoscience
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2022
·Vol. 12
·期 9
·2683-2693
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IF 3.869
Chi Yu,Ye Zhenghe,Su Xianyan,Li Zhao,Ren Xuexiang
In this work, a compound was fabricated using β-cyclodextrin (β-CD) and propithiumazole (PTC). FTIR and TG were used to analyze the intermolecular force and thermal stability of the compound and results indicated. The intermolecular forces were van der Waals forces. According to previous research, the seed coat agent and suspension concentrate (SC) were prepared using this compound and auxiliary. The inhibitory effect on Fusarium graminearum was studied with a bioassay. The data suggested inhibition rate of microencapsulated PTC are about 7.8% and 5% higher than PTC at 72 h and 192 h, respectively. In addition, results of pot experiments suggested dry weight of crops were increased after using seed coat agent contained microencapsulated prothioconazole which indicates that the seed coat agent may be beneficial to protein synthesis. Compared to commercial PTC, field experiments were conducted to investigate the preventive effects of SC against fusarium head blight (FHB). The results of toxicity test and field experiment showed that this compound can improve the utilization efficiency about 5% of PTC and reduce pesticide injury to wheat seeds.
研究领域:
植物保护
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农药科学
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产品关联
DOI
高影响因子
FLAVOUR AND FRAGRANCE JOURNAL
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2023
·Vol. 38
·期 2
·73-82
·
IF 2.6
Jiaying Gu,Ming Liu,Lin Li,Lulu Zhou,Lei He,Weijun Deng,Jing Hu
The leather with the long-lasting fragrance is critical for functional leather commodities but limited by poor temperature durability, low loading capacity and inferior flexural resistance. Herein, we develop a novel double-shell fragrance release system via both interfacial polymerization and freeze inducement. Osmanthus fragrance (OF) was encapsulated with polyurethane (PU) and silk fibroin (SF), the double-shell microcapsules with remarkable stability and enhanced sustained release property can be prepared. The OF@PU/SF microcapsules had well-defined spherical shape with an average diameter of 5.21 μm measured by Scanning Electron Microscopy (SEM), which was larger than the single-shell microcapsules (OF@SF) with the size of 1.70 μm. The thermogravimetric analysis (TGA) indicated that the OF loading capacity (LC) of OF@PU/SF microcapsules was 51.7%. Furthermore, the sustained release measurements by UV–vis absorption spectra clarified that 22.9% OF released from OF@PU/SF microcapsules during 30 days, lower than 36.7% of OF@SF microcapsules, much less than nearly 100% of free OF. Finally, the OF@PU/SF microcapsules were applied in leather finishing to efficiently improve the odour of the leather. The aromatic leather possessed sustained aroma with great stability enabling high temperature durability and flexural resistance property.
研究领域:
材料科学
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皮革化学
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芳香化学
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产品关联
DOI
高影响因子
POLYMER COMPOSITES
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2023
·
IF 5.2
Xudong Li,Junwei Wang,Xiaoyun Li,Qifeng Li,Maoqing Kang
Microcapsules with polydopamine composite shell layer were successfully synthesized by functionalizing silica-modified microcapsules containing isophorone diisocyanate. The components and micromorphology of silica-modified microcapsules at different reaction periods were studied by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy. The structure of different microcapsules was characterized by FTIR, 1 H nuclear magnetic resonance and x-ray photoelectron spectroscopy. The mechanical performances of different microcapsules were analyzed by nanoindentation technique. The compatibility and self-healing efficiency of different microcapsules with the substrate were also investigated by the tensile tests. The results showed that the density of the silica-modified microcapsule shell gradually increased and the mechanical performances were enhanced with the silica source. The hardness and elastic modulus of silica-modified microcapsules in suitable core fraction (76.5 wt%) were 139.9 MPa and 2.2 GPa, which are 2.3 times and 4.8 times higher than those of untreated microcapsules, respectively. The functionalized modified microcapsules had excellent compatibility with the elastomeric substrate (PU-PPG2000). At the same time, the self-healing efficiency of the functionalized modified microcapsules in PU-PPG2000 was 69.8%, which was 48.9% higher than that of the untreated microcapsules prepared under the same conditions. Silicon modification improved the density of microcapsules, enhancing their mechanical strength. At the same time, functionalization modification improved the interfacial bonding strength of microcapsules, further improving the compatibility with the polymer matrix. Highlights Microcapsules with different silicon sources are characterized. Microcapsules are functionalized with polydopamine. Individual microcapsules are tested for mechanical strength by nanoindentation. The compatibility of the functionalized microcapsules is excellent. The self-healing efficiency of modified microcapsules is greater than 70%.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yue Wu,Xiaotian Zhang,Mengyao He,Xue Tian,Neng Qian,Yangyi Sun,Dongming Qi
Microfiber-composed functional synthetic leather is of particular interest because it owns the advantages of good fluffiness, softness, excellent hygroscopicity , the random three-dimensional bundle structure similar to that of natural leather, which grants excellent moisture permeability, air permeability , chemical resistance, waterproof and mildew resistance, and various functions. Typically, the microfiber of functional synthetic leather is obtained through splitting the original sea-island fiber by solvent-induced dissolution and etching of its sea phase, which inevitably leads to the decline of the wettability of the treated leather. Herein, light-triggered functional microcapsules for self-healing wettability of split microfibers have been judiciously designed and developed. These functional microcapsules loaded with fluoroalkyl silane , which are used to coat onto the original sea-island fiber, allow for photocontrol of releasing the superhydrophobic chemical to the coated fibers. Despite the superhydrophobicity of the split fiber would be weakened by the splitting operation, the light-triggered release of fluoroalkyl silane can effectively amend its superhydrophobic properties. The microfiber leather self-repaired by the functional microcapsules exhibits good superhydrophobic performance, excellent self-cleaning ability to dust and RhB solution, high friction resistance (up to 200 rubs), and good UV light self-repairing cycle performance. This study provides a versatile solution for efficiently self-repairing microfiber leathers after the splitting process.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）