Interaction forces measured between poly(N-isopropylacrylamide) grafted surface and hydrophobic particle

Naoyuki Ishida, Mikio Kobayashi

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The interaction forces between poly(N-isopropylacrylamide) (PNIPAAm)-grafted surfaces and colloidal particles in an aqueous solution were investigated using an atomic force microscope. Measurements were conducted between smooth silicon wafers on which PNIPAAm was terminally grafted and silica particles hydrophobized with a silanating reagent in an aqueous electrolyte solution under controlled temperature. Below the lower critical solution temperature (LCST) of PNIPAAm, there were large repulsive forces between the surfaces, both on approach and separation of the surfaces. On the other hand, above LCST, attractive forces were observed both in approaching and in separating force curves. When surface hydrophobicity of the particles increased, the maximum attractive force tended to increase. The changes of hydration state of the grafted PNIPAAm chains depending on temperature are considered to greatly alter the interaction force properties. The role of the intermolecular interaction between the PNIPAAm chains and the hydrophobic particles in the interaction forces is discussed.

Original languageEnglish
Pages (from-to)513-519
Number of pages7
JournalJournal of Colloid and Interface Science
Volume297
Issue number2
DOIs
Publication statusPublished - May 15 2006
Externally publishedYes

Fingerprint

interactions
Temperature
Hydrophobicity
Silicon wafers
Hydration
Microscopes
Silicon Dioxide
Electrolytes
Silica
temperature
poly-N-isopropylacrylamide
hydrophobicity
reagents
hydration
microscopes
electrolytes
wafers
silicon dioxide
aqueous solutions
silicon

Keywords

  • Atomic force microscope
  • Colloidal particle
  • Graft
  • Hydrophobic interaction
  • Interaction force
  • N-Isopropylacrylamide
  • Thermo-responsive polymers

ASJC Scopus subject areas

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

Cite this

Interaction forces measured between poly(N-isopropylacrylamide) grafted surface and hydrophobic particle. / Ishida, Naoyuki; Kobayashi, Mikio.

In: Journal of Colloid and Interface Science, Vol. 297, No. 2, 15.05.2006, p. 513-519.

Research output: Contribution to journalArticle

@article{e1cf4adc46ae4d00a06c1782d70cabc6,
title = "Interaction forces measured between poly(N-isopropylacrylamide) grafted surface and hydrophobic particle",
abstract = "The interaction forces between poly(N-isopropylacrylamide) (PNIPAAm)-grafted surfaces and colloidal particles in an aqueous solution were investigated using an atomic force microscope. Measurements were conducted between smooth silicon wafers on which PNIPAAm was terminally grafted and silica particles hydrophobized with a silanating reagent in an aqueous electrolyte solution under controlled temperature. Below the lower critical solution temperature (LCST) of PNIPAAm, there were large repulsive forces between the surfaces, both on approach and separation of the surfaces. On the other hand, above LCST, attractive forces were observed both in approaching and in separating force curves. When surface hydrophobicity of the particles increased, the maximum attractive force tended to increase. The changes of hydration state of the grafted PNIPAAm chains depending on temperature are considered to greatly alter the interaction force properties. The role of the intermolecular interaction between the PNIPAAm chains and the hydrophobic particles in the interaction forces is discussed.",
keywords = "Atomic force microscope, Colloidal particle, Graft, Hydrophobic interaction, Interaction force, N-Isopropylacrylamide, Thermo-responsive polymers",
author = "Naoyuki Ishida and Mikio Kobayashi",
year = "2006",
month = "5",
day = "15",
doi = "10.1016/j.jcis.2005.10.068",
language = "English",
volume = "297",
pages = "513--519",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
number = "2",

}

TY - JOUR

T1 - Interaction forces measured between poly(N-isopropylacrylamide) grafted surface and hydrophobic particle

AU - Ishida, Naoyuki

AU - Kobayashi, Mikio

PY - 2006/5/15

Y1 - 2006/5/15

N2 - The interaction forces between poly(N-isopropylacrylamide) (PNIPAAm)-grafted surfaces and colloidal particles in an aqueous solution were investigated using an atomic force microscope. Measurements were conducted between smooth silicon wafers on which PNIPAAm was terminally grafted and silica particles hydrophobized with a silanating reagent in an aqueous electrolyte solution under controlled temperature. Below the lower critical solution temperature (LCST) of PNIPAAm, there were large repulsive forces between the surfaces, both on approach and separation of the surfaces. On the other hand, above LCST, attractive forces were observed both in approaching and in separating force curves. When surface hydrophobicity of the particles increased, the maximum attractive force tended to increase. The changes of hydration state of the grafted PNIPAAm chains depending on temperature are considered to greatly alter the interaction force properties. The role of the intermolecular interaction between the PNIPAAm chains and the hydrophobic particles in the interaction forces is discussed.

AB - The interaction forces between poly(N-isopropylacrylamide) (PNIPAAm)-grafted surfaces and colloidal particles in an aqueous solution were investigated using an atomic force microscope. Measurements were conducted between smooth silicon wafers on which PNIPAAm was terminally grafted and silica particles hydrophobized with a silanating reagent in an aqueous electrolyte solution under controlled temperature. Below the lower critical solution temperature (LCST) of PNIPAAm, there were large repulsive forces between the surfaces, both on approach and separation of the surfaces. On the other hand, above LCST, attractive forces were observed both in approaching and in separating force curves. When surface hydrophobicity of the particles increased, the maximum attractive force tended to increase. The changes of hydration state of the grafted PNIPAAm chains depending on temperature are considered to greatly alter the interaction force properties. The role of the intermolecular interaction between the PNIPAAm chains and the hydrophobic particles in the interaction forces is discussed.

KW - Atomic force microscope

KW - Colloidal particle

KW - Graft

KW - Hydrophobic interaction

KW - Interaction force

KW - N-Isopropylacrylamide

KW - Thermo-responsive polymers

UR - http://www.scopus.com/inward/record.url?scp=33646075118&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33646075118&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2005.10.068

DO - 10.1016/j.jcis.2005.10.068

M3 - Article

VL - 297

SP - 513

EP - 519

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

IS - 2

ER -