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Uniform discotic wax particles via electrospray emulsification

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Abstract.
We present a novel colloidal discotic system: the formation and self-assembling of wax microdisks with a
narrow size distribution. Uniform wax emulsions are first fabricated by electrospraying of melt a-eicosene.
The size of the emulsions can be flexibly tailored by varying the flow rate of the discontinuous
phase, its electric conductivity, and the applied voltage. The process of entrainment of wax droplets, vital
for obtaining uniform emulsions, is facilitated by the reduction of air–water surface tension and the density
of the continuous phase. Then uniform wax discotic particles are produced via phase transition, during
which the formation of a layered structure of the rotator phase of wax converts the droplets, one by
one, into oblate particles. The time span for the conversion from spherical emulsions to disk particles is
linearly dependent on the size of droplets in the emulsion, indicating the growth of a rotator phase from
surface to the center is the limiting step in the shape transition. Using polarized light microscopy, the
self-assembling of wax disks is observed by increasing disk concentration and inducing depletion attraction
among disks, where several phases, such as isotropic, condensed, columnar stacking, and self-assembly
of columnar rods are present sequentially during solvent evaporation of a suspension drop.

Keywords:
Colloidal disks
Rods
a-Eicosene
Phase transition
Electrospray
Density match
Surface tension match

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 334 (2009) 22–28

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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