Thermo-responsive copolymer coatings for flow regulation on demand in glass microcapillaries

Y. Zhang, Alexander Yarin

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This study presents thermo-responsive on-demand regulation of water flow rate in glass microcapillaries with a recently developed water-stable, stimuli-responsive poly(methyl methacrylate/N-isopropyl acrylamide) [P(MMA/NIPAM)] copolymer grafted at the inner walls. It is shown that the grafted coatings are stable and can withstand significant tractions under temperature variation. Such microcapillaries allow flow regulation on demand by changing temperature across the lower critical solution temperature (LCST) of the copolymer layer, which makes it swell or shrink, thus changing the bore available for pressure-driven flow. The grafted copolymer layers were subjected to different pressure drops applied to the capillary open ends, as well as to periodic temperature variation across the copolymer LCST to determine the best grafting conditions for microfluidic operation. Then, by varying the temperature, the flow rate in the capillaries was changed periodically on demand due to the swelling/shrinkage of the grafted copolymer layer. It was also shown that the entrapped air bubbles are present in the coating which can result in an apparent slip.

Original languageEnglish
Pages (from-to)211-218
Number of pages8
JournalEuropean Physical Journal E
Volume33
Issue number3
DOIs
Publication statusPublished - 2010 Nov 1
Externally publishedYes

Fingerprint

Glass
copolymers
Copolymers
coatings
Coatings
Temperature
glass
temperature
flow velocity
Flow rate
Pressure
Microfluidics
Water
Acrylamide
traction
water flow
Traction
Polymethyl Methacrylate
pressure drop
Polymethyl methacrylates

ASJC Scopus subject areas

  • Materials Science(all)
  • Surfaces and Interfaces
  • Chemistry(all)
  • Biophysics
  • Biotechnology
  • Medicine(all)

Cite this

Thermo-responsive copolymer coatings for flow regulation on demand in glass microcapillaries. / Zhang, Y.; Yarin, Alexander.

In: European Physical Journal E, Vol. 33, No. 3, 01.11.2010, p. 211-218.

Research output: Contribution to journalArticle

@article{6f76fa9a8851435bb8d72df0b6a58683,
title = "Thermo-responsive copolymer coatings for flow regulation on demand in glass microcapillaries",
abstract = "This study presents thermo-responsive on-demand regulation of water flow rate in glass microcapillaries with a recently developed water-stable, stimuli-responsive poly(methyl methacrylate/N-isopropyl acrylamide) [P(MMA/NIPAM)] copolymer grafted at the inner walls. It is shown that the grafted coatings are stable and can withstand significant tractions under temperature variation. Such microcapillaries allow flow regulation on demand by changing temperature across the lower critical solution temperature (LCST) of the copolymer layer, which makes it swell or shrink, thus changing the bore available for pressure-driven flow. The grafted copolymer layers were subjected to different pressure drops applied to the capillary open ends, as well as to periodic temperature variation across the copolymer LCST to determine the best grafting conditions for microfluidic operation. Then, by varying the temperature, the flow rate in the capillaries was changed periodically on demand due to the swelling/shrinkage of the grafted copolymer layer. It was also shown that the entrapped air bubbles are present in the coating which can result in an apparent slip.",
author = "Y. Zhang and Alexander Yarin",
year = "2010",
month = "11",
day = "1",
doi = "10.1140/epje/i2010-10666-3",
language = "English",
volume = "33",
pages = "211--218",
journal = "European Physical Journal E",
issn = "1292-8941",
publisher = "Springer New York",
number = "3",

}

TY - JOUR

T1 - Thermo-responsive copolymer coatings for flow regulation on demand in glass microcapillaries

AU - Zhang, Y.

AU - Yarin, Alexander

PY - 2010/11/1

Y1 - 2010/11/1

N2 - This study presents thermo-responsive on-demand regulation of water flow rate in glass microcapillaries with a recently developed water-stable, stimuli-responsive poly(methyl methacrylate/N-isopropyl acrylamide) [P(MMA/NIPAM)] copolymer grafted at the inner walls. It is shown that the grafted coatings are stable and can withstand significant tractions under temperature variation. Such microcapillaries allow flow regulation on demand by changing temperature across the lower critical solution temperature (LCST) of the copolymer layer, which makes it swell or shrink, thus changing the bore available for pressure-driven flow. The grafted copolymer layers were subjected to different pressure drops applied to the capillary open ends, as well as to periodic temperature variation across the copolymer LCST to determine the best grafting conditions for microfluidic operation. Then, by varying the temperature, the flow rate in the capillaries was changed periodically on demand due to the swelling/shrinkage of the grafted copolymer layer. It was also shown that the entrapped air bubbles are present in the coating which can result in an apparent slip.

AB - This study presents thermo-responsive on-demand regulation of water flow rate in glass microcapillaries with a recently developed water-stable, stimuli-responsive poly(methyl methacrylate/N-isopropyl acrylamide) [P(MMA/NIPAM)] copolymer grafted at the inner walls. It is shown that the grafted coatings are stable and can withstand significant tractions under temperature variation. Such microcapillaries allow flow regulation on demand by changing temperature across the lower critical solution temperature (LCST) of the copolymer layer, which makes it swell or shrink, thus changing the bore available for pressure-driven flow. The grafted copolymer layers were subjected to different pressure drops applied to the capillary open ends, as well as to periodic temperature variation across the copolymer LCST to determine the best grafting conditions for microfluidic operation. Then, by varying the temperature, the flow rate in the capillaries was changed periodically on demand due to the swelling/shrinkage of the grafted copolymer layer. It was also shown that the entrapped air bubbles are present in the coating which can result in an apparent slip.

UR - http://www.scopus.com/inward/record.url?scp=78649995648&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78649995648&partnerID=8YFLogxK

U2 - 10.1140/epje/i2010-10666-3

DO - 10.1140/epje/i2010-10666-3

M3 - Article

C2 - 21046184

AN - SCOPUS:78649995648

VL - 33

SP - 211

EP - 218

JO - European Physical Journal E

JF - European Physical Journal E

SN - 1292-8941

IS - 3

ER -