Microwave-assisted self-organization of colloidal particles in confining aqueous droplets

Shin Hyun Kim, Su Yeon Lee, Gi Ra Yi, David J. Pine, Seung Man Yang

Research output: Contribution to journalArticle

Abstract

Monodisperse aqueous emulsion droplets encapsulating colloidal particles were produced in the oil phase, and controlled microwave irradiation of the aqueous drop phase created spherical colloidal crystals by so-called evaporation-induced self-organization of the colloidal particles. Unlike usual colloidal crystals, colloidal crystals in spherical symmetry (or photonic balls) possessed photonic band gaps for the normal incident light independent of the position all over the spherical surface. While the consolidation of colloidal particles in emulsion droplets in an oven took several hours, the present microwave-assisted evaporation could reduce the time for complete evaporation to a few tens of minutes. Under the microwave irradiation, the aqueous phase in emulsions was superheated selectively and the evaporation rate of water could be controlled easily by adjusting the microwave intensity. The result showed that the packing quality of colloidal crystals obtained by the microwave-assisted self-organization was good enough to show photonic band gap characteristics. The reflectance of our photonic balls responded precisely to any change in physical properties including the size of colloidal particles, refractive index mismatch, and angle of the incident beam. In particular, for polymeric particles, the photonic band gap could be tuned by the intensity of microwave irradiation, and the reflection color was red-shifted with stronger microwave irradiation. Finally, for better photonic band gap properties, inverted photonic balls were prepared by using the spherical colloidal crystals as sacrificial templates.

Original languageEnglish (US)
Pages (from-to)10897-10904
Number of pages8
JournalJournal of the American Chemical Society
Volume128
Issue number33
DOIs
StatePublished - Aug 23 2006

Fingerprint

Optics and Photonics
Microwaves
Photonic band gap
Microwave irradiation
Evaporation
Crystals
Emulsions
Photonics
Crystal symmetry
Ovens
Consolidation
Particles (particulate matter)
Refractometry
Refractive index
Oils
Physical properties
Particle Size
Color
Water
Light

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Microwave-assisted self-organization of colloidal particles in confining aqueous droplets. / Kim, Shin Hyun; Lee, Su Yeon; Yi, Gi Ra; Pine, David J.; Yang, Seung Man.

In: Journal of the American Chemical Society, Vol. 128, No. 33, 23.08.2006, p. 10897-10904.

Research output: Contribution to journalArticle

Kim, Shin Hyun ; Lee, Su Yeon ; Yi, Gi Ra ; Pine, David J. ; Yang, Seung Man. / Microwave-assisted self-organization of colloidal particles in confining aqueous droplets. In: Journal of the American Chemical Society. 2006 ; Vol. 128, No. 33. pp. 10897-10904.
@article{d3fb2db2e4604dd9acfa11872b47579d,
title = "Microwave-assisted self-organization of colloidal particles in confining aqueous droplets",
abstract = "Monodisperse aqueous emulsion droplets encapsulating colloidal particles were produced in the oil phase, and controlled microwave irradiation of the aqueous drop phase created spherical colloidal crystals by so-called evaporation-induced self-organization of the colloidal particles. Unlike usual colloidal crystals, colloidal crystals in spherical symmetry (or photonic balls) possessed photonic band gaps for the normal incident light independent of the position all over the spherical surface. While the consolidation of colloidal particles in emulsion droplets in an oven took several hours, the present microwave-assisted evaporation could reduce the time for complete evaporation to a few tens of minutes. Under the microwave irradiation, the aqueous phase in emulsions was superheated selectively and the evaporation rate of water could be controlled easily by adjusting the microwave intensity. The result showed that the packing quality of colloidal crystals obtained by the microwave-assisted self-organization was good enough to show photonic band gap characteristics. The reflectance of our photonic balls responded precisely to any change in physical properties including the size of colloidal particles, refractive index mismatch, and angle of the incident beam. In particular, for polymeric particles, the photonic band gap could be tuned by the intensity of microwave irradiation, and the reflection color was red-shifted with stronger microwave irradiation. Finally, for better photonic band gap properties, inverted photonic balls were prepared by using the spherical colloidal crystals as sacrificial templates.",
author = "Kim, {Shin Hyun} and Lee, {Su Yeon} and Yi, {Gi Ra} and Pine, {David J.} and Yang, {Seung Man}",
year = "2006",
month = "8",
day = "23",
doi = "10.1021/ja063528y",
language = "English (US)",
volume = "128",
pages = "10897--10904",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "American Chemical Society",
number = "33",

}

TY - JOUR

T1 - Microwave-assisted self-organization of colloidal particles in confining aqueous droplets

AU - Kim, Shin Hyun

AU - Lee, Su Yeon

AU - Yi, Gi Ra

AU - Pine, David J.

AU - Yang, Seung Man

PY - 2006/8/23

Y1 - 2006/8/23

N2 - Monodisperse aqueous emulsion droplets encapsulating colloidal particles were produced in the oil phase, and controlled microwave irradiation of the aqueous drop phase created spherical colloidal crystals by so-called evaporation-induced self-organization of the colloidal particles. Unlike usual colloidal crystals, colloidal crystals in spherical symmetry (or photonic balls) possessed photonic band gaps for the normal incident light independent of the position all over the spherical surface. While the consolidation of colloidal particles in emulsion droplets in an oven took several hours, the present microwave-assisted evaporation could reduce the time for complete evaporation to a few tens of minutes. Under the microwave irradiation, the aqueous phase in emulsions was superheated selectively and the evaporation rate of water could be controlled easily by adjusting the microwave intensity. The result showed that the packing quality of colloidal crystals obtained by the microwave-assisted self-organization was good enough to show photonic band gap characteristics. The reflectance of our photonic balls responded precisely to any change in physical properties including the size of colloidal particles, refractive index mismatch, and angle of the incident beam. In particular, for polymeric particles, the photonic band gap could be tuned by the intensity of microwave irradiation, and the reflection color was red-shifted with stronger microwave irradiation. Finally, for better photonic band gap properties, inverted photonic balls were prepared by using the spherical colloidal crystals as sacrificial templates.

AB - Monodisperse aqueous emulsion droplets encapsulating colloidal particles were produced in the oil phase, and controlled microwave irradiation of the aqueous drop phase created spherical colloidal crystals by so-called evaporation-induced self-organization of the colloidal particles. Unlike usual colloidal crystals, colloidal crystals in spherical symmetry (or photonic balls) possessed photonic band gaps for the normal incident light independent of the position all over the spherical surface. While the consolidation of colloidal particles in emulsion droplets in an oven took several hours, the present microwave-assisted evaporation could reduce the time for complete evaporation to a few tens of minutes. Under the microwave irradiation, the aqueous phase in emulsions was superheated selectively and the evaporation rate of water could be controlled easily by adjusting the microwave intensity. The result showed that the packing quality of colloidal crystals obtained by the microwave-assisted self-organization was good enough to show photonic band gap characteristics. The reflectance of our photonic balls responded precisely to any change in physical properties including the size of colloidal particles, refractive index mismatch, and angle of the incident beam. In particular, for polymeric particles, the photonic band gap could be tuned by the intensity of microwave irradiation, and the reflection color was red-shifted with stronger microwave irradiation. Finally, for better photonic band gap properties, inverted photonic balls were prepared by using the spherical colloidal crystals as sacrificial templates.

UR - http://www.scopus.com/inward/record.url?scp=33747769641&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33747769641&partnerID=8YFLogxK

U2 - 10.1021/ja063528y

DO - 10.1021/ja063528y

M3 - Article

VL - 128

SP - 10897

EP - 10904

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 33

ER -