Facile and highly efficient microencapsulation of a phase change material using tubular microfluidics

Saifullah Lone, Hyang Moo Lee, Gyu Man Kim, Won Gun Koh, In Woo Cheong

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

This paper presents a microfluidic approach towards the fabrication of highly monodisperse polyurea microcapsules, 35-500μm in size, containing n-octadecane (phase change material, PCM). The synthesis consisted of the following two steps: (i) emulsification of n-octadecane, isophorone diisocyanate (IPDI) and dibutyltin dilaurate (DBTDL) in an aqueous mixture of tetraethylenepentamine (TEPA), poly (vinyl alcohol) and sodium dodecyl sulfate (SDS)and (ii) in situ polycondensation between TEPA and IPDI along and outside the tube length. The resulting PCM@polyurea microcapsules underwent a rapid and repeated liquid/solid phase transformation at different temperatures. The average sizes and morphology of the microcapsules were controlled by tuning the flow rate of either the continuous or discontinuous phase. The morphology, polycondensation and phase change behavior of the microcapsules were investigated by optical microscopy equipped with a thermostat plate, scanning electron microscopy, Fourier transform infrared spectroscopy and differential scanning calorimetry. The effect of the hydrophobic Fe3O4 nanoparticles (NPs) on the crystallization behavior was also examined in cases of microcapsules with or without NPs.

Original languageEnglish
Pages (from-to)61-67
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume422
DOIs
Publication statusPublished - 2013 Apr 5

Fingerprint

Microencapsulation
diisocyanates
phase change materials
Phase change materials
Polycondensation
Microfluidics
Capsules
Nanoparticles
Thermostats
nanoparticles
thermostats
Emulsification
Sodium dodecyl sulfate
sodium sulfates
Optical microscopy
Fourier transform infrared spectroscopy
phase transformations
solid phases
Differential scanning calorimetry
alcohols

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

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abstract = "This paper presents a microfluidic approach towards the fabrication of highly monodisperse polyurea microcapsules, 35-500μm in size, containing n-octadecane (phase change material, PCM). The synthesis consisted of the following two steps: (i) emulsification of n-octadecane, isophorone diisocyanate (IPDI) and dibutyltin dilaurate (DBTDL) in an aqueous mixture of tetraethylenepentamine (TEPA), poly (vinyl alcohol) and sodium dodecyl sulfate (SDS)and (ii) in situ polycondensation between TEPA and IPDI along and outside the tube length. The resulting PCM@polyurea microcapsules underwent a rapid and repeated liquid/solid phase transformation at different temperatures. The average sizes and morphology of the microcapsules were controlled by tuning the flow rate of either the continuous or discontinuous phase. The morphology, polycondensation and phase change behavior of the microcapsules were investigated by optical microscopy equipped with a thermostat plate, scanning electron microscopy, Fourier transform infrared spectroscopy and differential scanning calorimetry. The effect of the hydrophobic Fe3O4 nanoparticles (NPs) on the crystallization behavior was also examined in cases of microcapsules with or without NPs.",
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Facile and highly efficient microencapsulation of a phase change material using tubular microfluidics. / Lone, Saifullah; Lee, Hyang Moo; Kim, Gyu Man; Koh, Won Gun; Cheong, In Woo.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 422, 05.04.2013, p. 61-67.

Research output: Contribution to journalArticle

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