Abstract
Adhesion and friction forces between surfaces with pre-determined terminal groups were measured by chemically modified scanning probe microscopy tips. Surfaces composed of various terminal groups (CH3, NH2, and SO3H) were obtained by direct chemisorption of silane based compounds on silicon/silicon nitrides. Work of adhesion and friction coefficients were obtained for different types of modified tips and surfaces in aqueous solutions with variations in pH. Absolute values of work of adhesion between various surfaces, Wad, are in the range of 0.5 to 8 mJ/m2. Friction properties vary with pH in a register with adhesive forces showing a broad maximum at intermediate pH values. This behavior can be understood by considering changes in surface charge state which is determined by the zwitterionic nature of silicon nitride surfaces with multiple isoelectric points.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 312-320 |
| Number of pages | 9 |
| Journal | ACS Symposium Series |
| Volume | 694 |
| State | Published - 1998 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Chemistry(all)
Cite this
Chemical Force Microscopy : Probing and Imaging Interactions between Functional Groups. / Vezenov, Dmitri V.; Noy, Aleksandr; Lieber, Charles M.
In: ACS Symposium Series, Vol. 694, 1998, p. 312-320.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Chemical Force Microscopy
T2 - Probing and Imaging Interactions between Functional Groups
AU - Vezenov, Dmitri V.
AU - Noy, Aleksandr
AU - Lieber, Charles M.
PY - 1998
Y1 - 1998
N2 - Adhesion and friction forces between surfaces with pre-determined terminal groups were measured by chemically modified scanning probe microscopy tips. Surfaces composed of various terminal groups (CH3, NH2, and SO3H) were obtained by direct chemisorption of silane based compounds on silicon/silicon nitrides. Work of adhesion and friction coefficients were obtained for different types of modified tips and surfaces in aqueous solutions with variations in pH. Absolute values of work of adhesion between various surfaces, Wad, are in the range of 0.5 to 8 mJ/m2. Friction properties vary with pH in a register with adhesive forces showing a broad maximum at intermediate pH values. This behavior can be understood by considering changes in surface charge state which is determined by the zwitterionic nature of silicon nitride surfaces with multiple isoelectric points.
AB - Adhesion and friction forces between surfaces with pre-determined terminal groups were measured by chemically modified scanning probe microscopy tips. Surfaces composed of various terminal groups (CH3, NH2, and SO3H) were obtained by direct chemisorption of silane based compounds on silicon/silicon nitrides. Work of adhesion and friction coefficients were obtained for different types of modified tips and surfaces in aqueous solutions with variations in pH. Absolute values of work of adhesion between various surfaces, Wad, are in the range of 0.5 to 8 mJ/m2. Friction properties vary with pH in a register with adhesive forces showing a broad maximum at intermediate pH values. This behavior can be understood by considering changes in surface charge state which is determined by the zwitterionic nature of silicon nitride surfaces with multiple isoelectric points.
UR - http://www.scopus.com/inward/record.url?scp=0347804893&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0347804893&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0347804893
VL - 694
SP - 312
EP - 320
JO - ACS Symposium Series
JF - ACS Symposium Series
SN - 0097-6156
ER -