Directed nanoparticle motion on an interfacial free energy gradient
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Anmeldedatum
Publikationsdatum
2010
Departement
Life Sciences and Facility Management
Organisationseinheit
Institut für Chemie und Biotechnologie (ICBT)
Publikationstyp
Beitrag in wissenschaftlicher Zeitschrift
Begutachtung
Peer review (Publikation)
Konferenz
Übergeordnetes Werk
Langmuir
Tagungsband
Zitierform
Band – Heft – Seitenzahlen - Artikelnummer
26(3), 1501-1503
Reihe
Verlag
American Chemical Society
ISBN
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Zusammenfassung
Using total internal reflection fluorescence microscopy (TIRFM), we have observed the directed motion of 20 nm probe particles on specific regions of surfaces that exhibited strong gradients of hydrophobicity. Patterned surfaces were prepared by selective photodegradation (using a contact photomask) of a hydrophobically modified fused silica surface. The lateral distribution of hydrophobicity was characterized in situ using the selective affinity of amphiphilic probes (i.e., hydrophobic interaction microscopy). Probe particles were observed to move unidirectionally from regions of lower to higher to hydrophobicity over distances of approximately 1 microm when the hydrophobicity gradient was greater than d(cos theta)/dx = 0.05 +/- 0.02 microm(-1), where theta is the water contact angle on the bare surface. Only adsorption events were observed on energetically homogeneous surface regions.