Synthesis of nonspherical superparamagnetic particles: In situ coprecipitation of magnetic nanoparticles in microgels prepared by stop-flow lithography

Su Kyung Suh, Kai Yuet, Dae Kun Hwang, Ki Wan Bong, Patrick S. Doyle, T. Alan Hatton

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

We present the synthesis of nonspherical magnetic microparticles with multiple functionalities, shapes, and chemistries. Particle synthesis was performed in two steps: polymeric microparticles functionalized homogenously with carboxyl groups were generated using stop-flow lithography, and then in situ coprecipitation was used to grow magnetic nanoparticles at these carboxyl sites. With successive growth of magnetic nanoparticles, we obtained polymeric particles with saturation magnetizations of up to 42 emu/g microparticle. The growth in the magnetic nanoparticle mean size and polydispersity was determined from the magnetization curves obtained following each growth cycle; nanoparticle sizes were limited by the physical constraint of the effective mesh within the hosting gel microparticle. Particles with spatially segregated domains of varying magnetic properties (e.g., Janus particles, particles with step changes in magnetite concentration, etc.) can be synthesized readily using this approach.

Original languageEnglish
Pages (from-to)7337-7343
Number of pages7
JournalJournal of the American Chemical Society
Volume134
Issue number17
DOIs
Publication statusPublished - 2012 May 2
Externally publishedYes

Fingerprint

Coprecipitation
Nanoparticles
Lithography
Growth
Dromaiidae
Ferrosoferric Oxide
Polydispersity
Magnetite
Saturation magnetization
Particles (particulate matter)
Magnetization
Magnetic properties
Gels

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Synthesis of nonspherical superparamagnetic particles : In situ coprecipitation of magnetic nanoparticles in microgels prepared by stop-flow lithography. / Suh, Su Kyung; Yuet, Kai; Hwang, Dae Kun; Bong, Ki Wan; Doyle, Patrick S.; Hatton, T. Alan.

In: Journal of the American Chemical Society, Vol. 134, No. 17, 02.05.2012, p. 7337-7343.

Research output: Contribution to journalArticle

@article{7d912d0007714f0185edb483daff2038,
title = "Synthesis of nonspherical superparamagnetic particles: In situ coprecipitation of magnetic nanoparticles in microgels prepared by stop-flow lithography",
abstract = "We present the synthesis of nonspherical magnetic microparticles with multiple functionalities, shapes, and chemistries. Particle synthesis was performed in two steps: polymeric microparticles functionalized homogenously with carboxyl groups were generated using stop-flow lithography, and then in situ coprecipitation was used to grow magnetic nanoparticles at these carboxyl sites. With successive growth of magnetic nanoparticles, we obtained polymeric particles with saturation magnetizations of up to 42 emu/g microparticle. The growth in the magnetic nanoparticle mean size and polydispersity was determined from the magnetization curves obtained following each growth cycle; nanoparticle sizes were limited by the physical constraint of the effective mesh within the hosting gel microparticle. Particles with spatially segregated domains of varying magnetic properties (e.g., Janus particles, particles with step changes in magnetite concentration, etc.) can be synthesized readily using this approach.",
author = "Suh, {Su Kyung} and Kai Yuet and Hwang, {Dae Kun} and Bong, {Ki Wan} and Doyle, {Patrick S.} and Hatton, {T. Alan}",
year = "2012",
month = "5",
day = "2",
doi = "10.1021/ja209245v",
language = "English",
volume = "134",
pages = "7337--7343",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "American Chemical Society",
number = "17",

}

TY - JOUR

T1 - Synthesis of nonspherical superparamagnetic particles

T2 - In situ coprecipitation of magnetic nanoparticles in microgels prepared by stop-flow lithography

AU - Suh, Su Kyung

AU - Yuet, Kai

AU - Hwang, Dae Kun

AU - Bong, Ki Wan

AU - Doyle, Patrick S.

AU - Hatton, T. Alan

PY - 2012/5/2

Y1 - 2012/5/2

N2 - We present the synthesis of nonspherical magnetic microparticles with multiple functionalities, shapes, and chemistries. Particle synthesis was performed in two steps: polymeric microparticles functionalized homogenously with carboxyl groups were generated using stop-flow lithography, and then in situ coprecipitation was used to grow magnetic nanoparticles at these carboxyl sites. With successive growth of magnetic nanoparticles, we obtained polymeric particles with saturation magnetizations of up to 42 emu/g microparticle. The growth in the magnetic nanoparticle mean size and polydispersity was determined from the magnetization curves obtained following each growth cycle; nanoparticle sizes were limited by the physical constraint of the effective mesh within the hosting gel microparticle. Particles with spatially segregated domains of varying magnetic properties (e.g., Janus particles, particles with step changes in magnetite concentration, etc.) can be synthesized readily using this approach.

AB - We present the synthesis of nonspherical magnetic microparticles with multiple functionalities, shapes, and chemistries. Particle synthesis was performed in two steps: polymeric microparticles functionalized homogenously with carboxyl groups were generated using stop-flow lithography, and then in situ coprecipitation was used to grow magnetic nanoparticles at these carboxyl sites. With successive growth of magnetic nanoparticles, we obtained polymeric particles with saturation magnetizations of up to 42 emu/g microparticle. The growth in the magnetic nanoparticle mean size and polydispersity was determined from the magnetization curves obtained following each growth cycle; nanoparticle sizes were limited by the physical constraint of the effective mesh within the hosting gel microparticle. Particles with spatially segregated domains of varying magnetic properties (e.g., Janus particles, particles with step changes in magnetite concentration, etc.) can be synthesized readily using this approach.

UR - http://www.scopus.com/inward/record.url?scp=84860794252&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84860794252&partnerID=8YFLogxK

U2 - 10.1021/ja209245v

DO - 10.1021/ja209245v

M3 - Article

C2 - 22462394

AN - SCOPUS:84860794252

VL - 134

SP - 7337

EP - 7343

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 17

ER -