Directed nanoparticle motion on an interfacial free energy gradient

Walder, Robert; Honciuc, Andrei; Schwartz, Daniel K.

doi:10.1021/la903753z

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Directed nanoparticle motion on an interfacial free energy gradient
Authors:	Walder, Robert Honciuc, Andrei Schwartz, Daniel K.
DOI:	10.1021/la903753z
Published in:	Langmuir
Volume(Issue):	26
Issue:	3
Page(s):	1501
Pages to:	1503
Issue Date:	2010
Publisher / Ed. Institution:	American Chemical Society
ISSN:	0743-7463 1520-5827
Language:	English
Subject (DDC):	540: Chemistry
Abstract:	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.
URI:	https://digitalcollection.zhaw.ch/handle/11475/14579
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	Life Sciences and Facility Management
Organisational Unit:	Institute of Chemistry and Biotechnology (ICBT)
Appears in collections:	Publikationen Life Sciences und Facility Management

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Walder, R., Honciuc, A., & Schwartz, D. K. (2010). Directed nanoparticle motion on an interfacial free energy gradient. Langmuir, 26(3), 1501–1503. https://doi.org/10.1021/la903753z

Walder, R., Honciuc, A. and Schwartz, D.K. (2010) ‘Directed nanoparticle motion on an interfacial free energy gradient’, Langmuir, 26(3), pp. 1501–1503. Available at: https://doi.org/10.1021/la903753z.

R. Walder, A. Honciuc, and D. K. Schwartz, “Directed nanoparticle motion on an interfacial free energy gradient,” Langmuir, vol. 26, no. 3, pp. 1501–1503, 2010, doi: 10.1021/la903753z.

WALDER, Robert, Andrei HONCIUC und Daniel K. SCHWARTZ, 2010. Directed nanoparticle motion on an interfacial free energy gradient. Langmuir. 2010. Bd. 26, Nr. 3, S. 1501–1503. DOI 10.1021/la903753z

Walder, Robert, Andrei Honciuc, and Daniel K. Schwartz. 2010. “Directed Nanoparticle Motion on an Interfacial Free Energy Gradient.” Langmuir 26 (3): 1501–3. https://doi.org/10.1021/la903753z.

Walder, Robert, et al. “Directed Nanoparticle Motion on an Interfacial Free Energy Gradient.” Langmuir, vol. 26, no. 3, 2010, pp. 1501–3, https://doi.org/10.1021/la903753z.