Preparation of Microcapsules Containing Two-Phase Core Materials

Wang, Jianping; Zhao, Xiaopeng; Guo, Huilin; Zheng, Qing

doi:10.1021/la0490902

Cited by 82 publications

(34 citation statements)

References 20 publications

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“…6, the pentoxifylline release was the highest at the emulsifier content of 2.0%, while this at the emulsifier content of 1.0%, 2.0% and 2.5%, was lower. The reason should be that the average particle size of the microcapsules at the emulsifier content being 2.0% is the smallest, while those from the microcapsules at the emulsifier content being 1.0%, 1.5% and 2.0 % are larger, and the smallest particle size microcapsules would have the largest total specific surface area, therefore causing the highest release at the same temperature and pH 29 . …”

Section: Effect Of Ph On the Drug Release Behaviour Of Microcapsulesmentioning

confidence: 99%

Untitled

2017

IJPSR

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ABSTRACT:The pH/temperature sensitive microcapsules were prepared by inverse emulsion polymerization, in which sodium alginate (SA) and N-isopropyl acrylamide (NIPAm) were used as the wall material and pentoxifylline as a model drug. The effects of the emulsifier content on the particle size distribution and drug release property of microcapsules were discussed in detail. The structure, morphology, particle size and its distribution of microcapsules were characterized by Fourier transform infrared spectrophotometry (FTIR), scanning electron microscopy (SEM), transmission electron microscope (TEM), Malvern particle size analysis and UV-vis spectrophotometer. The release behavious of pentoxifylline in different phosphate buffered saline (PBS) pH were investigated systematically. The results showed that the resultant microcapsules had narrower particle size distribution, smoother surface and higher drug release amount with the percentage weight of emulsifier being 2.0%. The TEM photograph exhibited that the microcapsules had core and shell structures. The drug-release behavior of pentoxifylline from microcapsules was evaluated as a function of pH/temperature. The results indicated that these drug-loaded microcapsules have shown sensitivity to pH value and temperature.

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Section: Effect Of Ph On the Drug Release Behaviour Of Microcapsulesmentioning

confidence: 99%

Untitled

2017

IJPSR

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“…% of 1-octadecanol as a nucleating agent. Wang et al [29] fabricated Urea-formaldehyde (UF) microcapsules containing two-phase core materials in which phthalocyanine blue BGS particles were homo-dispersed in tetrachloroethylene (TCE).…”

Section: In Situ Polymerizationmentioning

confidence: 99%

Review on microencapsulated phase change materials (MEPCMs): Fabrication, characterization and applications

Zhao

Zhang

2011

Renewable and Sustainable Energy Reviews

418

155

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The use of latent heat storage, microencapsulated phase change materials (MEPCMs), is one of the most efficient ways of storing thermal energy and it has received a growing attention in the past decade. However, there is no complete overview of its utilisation in thermal energy storage systems, and the information is widely spread in the literature. In this paper, a comprehensive review has been carried out for MEPCMs. Four aspects have been the focus of this review: fabrication and characterization of MEPCMs, applications of MEPCMs to the textile and building, fundamental properties of microencapsulated phase change material slurry (MPCS) and application of MPCS to the thermal energy storage system. Over 140 recent publications are referenced in this paper.

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“…The charged properties were tested on modified particles at different pH values, and the results indicated that particles at pH <10 responded to electric field and the response time decreased with pH increasing from 50 s (pH 1-2) to 35 s (pH [8][9]. No response was found at pH 12-13, assuming that less quantity of H 2 SO 4 could not fully react with NaAlO 2 at high pH.…”

Section: Effect Of Temperature On Modificationmentioning

confidence: 99%

Surface modification of Titanium dioxide for electrophoretic particles

Peng

et al. 2007

Front. Chem. Eng. China

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To prepare stable electrophoretic ink (E Ink) needs color particles to be uniformly dispersed in the organic medium. Thus, t-he modification of inorganic particle surface is required. In this paper, Titanium dioxide modified by alumina has been studied. The surface composition and structures of modified particles have been characterized by Xray photoelectron spectrometer (XPS), X-ray diffractometer (XRD) and Fourier transform infrared spectrometer (FT-IR). The dispersibility and electrophoretic mobility of these particles in tetrachloroethylene (TCE) have been investigated by laser particle size analyzer, static sedimentation and electrophoretic instrument. Effects of temperature, pH value and stirring rate on the dispersibility and the charge property of samples have been discussed. The results indicate the settle time of modified TiO 2 can last 120 h with the response time of 35 s under the optimized modifying conditions, in which temperature is 85°C-90°C, pH is 8-9 and stirring rate is 800 r · min −1 . The dispersibility and electrophoretic mobility have been significantly improved, which means that the modified TiO 2 is suitable for electrophoretic ink particles.

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Preparation of Microcapsules Containing Two-Phase Core Materials

Cited by 82 publications

References 20 publications

Untitled

Untitled

Review on microencapsulated phase change materials (MEPCMs): Fabrication, characterization and applications

Surface modification of Titanium dioxide for electrophoretic particles

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