Hans A. Biebuyck

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This paper demonstrates that surface plasmon resonance (SPR) spectroscopy can be used to measure the nonspecific adsorption of proteins to self-assembled monolayers (SAMs) of alkanethiolates on gold in situ and in real time. Mixed SAMs comprising hexa(ethy1ene glycol) and methyl groups that have values of X M ~ < 0.5 resisted the adsorption of four test(More)
Condensation of a vapor to a liquid on a cold surface that is not wet completely by this liquid leads to the formation of an array of droplets. If the surface is heterogeneous in its physical properties (especially its interfacial free energy), the patterns of these arrays reflect this heterogeneity. The distribution of droplets of water (condensation(More)
We have used applied electrical potentials, in combination with self-assembled monolayers (SAMs) of alkanethiolates supported on gold films, to control the wettability of a surface over wide ranges. A surface can be transformed from nonwetting to wetting, or the reverse, with time constants of seconds. The method is based on a competition between reductive(More)
After this the polymer was rigid and could be peeled off carefully from the silicon master. The suspensions were prepared by adding powder to distilled water under constant stirring. The pH was always kept between 4 and 5 by dropwise adding a 2 M solution of hydrochloric acid (Titrisol, Merck, Darmstadt, Germany). Thereafter the suspensions were ball milled(More)
The relative importance of x-rays alone and of x-ray-generated primary and secondary electrons in damaging organic materials was explored by use of self-assembled monolayers (SAMs) on multilayer thin-film supports. The substrates were prepared by the deposit of thin films of silicon (0, 50, 100, and 200 angstroms) on thick layers of gold (2000 angstroms).(More)
  • J M Geary, J W Goodby, A R Kmetz, J S Patel, J Lacey, E Doyle +42 others
  • 2004
light microscopy (Zeiss LM Axioplan) equipped with digital camera. The cell thickness was determined by UV-visible spectroscopy (Shimadzu UV-3102 PC). Electro-Optical Characterization: The electro-optical characteristics were investigated using DMS 703 display measuring system (Autronic-Melchers GmbH). A square wave was used in order to drive the cells for(More)
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