Abstract
The interaction forces between poly (N-isopropylacrylamide) (PNIPAAm)-grafted surfaces and colloidal particles in an aqueous solution were investigated using atomic force microscopy. The measurements were conducted between a smooth silicon wafer on which PNIPAAm was terminally grafted and silica particles hydrophobized with a silanating reagent in an aqueous electrolyte solution under controlled temperature. Large repulsive forces were observed between the surfaces below the lower critical solution temperature (LCST) of PNIPAAm, while attractive forces were observed above the LCST. The magnitude of the attractive force tended to increase with the surface hydrophobicity of the particles. The temperature-induced changes in the hydration state of the grafted PNIPAAm chains are considered to greatly alter the interaction force properties. The role of the intermolecular interaction between the PNIPAAm chains and hydrophobic particles in the interaction forces is discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 631-642 |
| Number of pages | 12 |
| Journal | Advanced Powder Technology |
| Volume | 18 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Nov 1 2007 |
| Externally published | Yes |
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Keywords
- Atomic force microscopy
- Colloidal particle
- Graft
- Hydrophobic interaction
- Interaction force
- N-isopropylacrylamide
- Thermoresponsive polymers
ASJC Scopus subject areas
- Chemical Engineering(all)
Cite this
Interaction forces between a poly (N-isopropylacryamide) layer grafted onto a solid surface and a hydrophobic particle. / Ishida, Naoyuki.
In: Advanced Powder Technology, Vol. 18, No. 6, 01.11.2007, p. 631-642.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Interaction forces between a poly (N-isopropylacryamide) layer grafted onto a solid surface and a hydrophobic particle
AU - Ishida, Naoyuki
PY - 2007/11/1
Y1 - 2007/11/1
N2 - The interaction forces between poly (N-isopropylacrylamide) (PNIPAAm)-grafted surfaces and colloidal particles in an aqueous solution were investigated using atomic force microscopy. The measurements were conducted between a smooth silicon wafer on which PNIPAAm was terminally grafted and silica particles hydrophobized with a silanating reagent in an aqueous electrolyte solution under controlled temperature. Large repulsive forces were observed between the surfaces below the lower critical solution temperature (LCST) of PNIPAAm, while attractive forces were observed above the LCST. The magnitude of the attractive force tended to increase with the surface hydrophobicity of the particles. The temperature-induced changes in the hydration state of the grafted PNIPAAm chains are considered to greatly alter the interaction force properties. The role of the intermolecular interaction between the PNIPAAm chains and 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 atomic force microscopy. The measurements were conducted between a smooth silicon wafer on which PNIPAAm was terminally grafted and silica particles hydrophobized with a silanating reagent in an aqueous electrolyte solution under controlled temperature. Large repulsive forces were observed between the surfaces below the lower critical solution temperature (LCST) of PNIPAAm, while attractive forces were observed above the LCST. The magnitude of the attractive force tended to increase with the surface hydrophobicity of the particles. The temperature-induced changes in the hydration state of the grafted PNIPAAm chains are considered to greatly alter the interaction force properties. The role of the intermolecular interaction between the PNIPAAm chains and hydrophobic particles in the interaction forces is discussed.
KW - Atomic force microscopy
KW - Colloidal particle
KW - Graft
KW - Hydrophobic interaction
KW - Interaction force
KW - N-isopropylacrylamide
KW - Thermoresponsive polymers
UR - http://www.scopus.com/inward/record.url?scp=36148998040&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=36148998040&partnerID=8YFLogxK
U2 - 10.1163/156855207782515102
DO - 10.1163/156855207782515102
M3 - Article
VL - 18
SP - 631
EP - 642
JO - Advanced Powder Technology
JF - Advanced Powder Technology
SN - 0921-8831
IS - 6
ER -