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Microfluidic networks (microFNs) were used to pattern biomolecules with high resolution on a variety of substrates (gold, glass, or polystyrene). Elastomeric microFNs localized chemical reactions between the biomolecules and the surface, requiring only microliters of reagent to cover square millimeter-sized areas. The networks were designed to ensure(More)
Biological experiments at the solid/liquid interface, in general, require surfaces with a thin layer of purified molecules, which often represent precious material. Here, we have devised a method to extract proteins with high selectivity from crude biological sample solutions and place them on a surface in a functional, arbitrary pattern. This method,(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)
This paper outlines a general s1'nthetic route to alkanethiols useful in forming self-asserylied monolayers (SAMsistarting from amines. RNH:. and converting them. r'ia cr-chloroamides RNHCOCHzCI, to thiols having the structure RNHCOCH2SH. The u'ettabilitres ,estinrated froni contact angles of rvater and hexadecane) and the thicknesses {as measured bv(More)
We have formed self-assembled monolayers (SAMs) of alkanethiolates on 5-nm-and l0-nm-thick films of gold supported on titanium-primed glass. These electrically-conductive films transmit visible light,s support SAMs that have wetting properties superior to those of SAMs supported on opaque 200-nm-thick films commonly used in this area of surface chemistr),6(More)
The combination of aqueous, alkaline cyanide ion (l M KOH, 0.1 M KCN) and dioxygen rapidly etches Au(0) (eq l).'-o Self-assembled monolayers (SAMs) of long-chain alkanethiolates 4Au * 8CN-+ 02 + 2H2O-4[Au(CN)z]-+ 4OH-(l) on the surface of the gold block this etching. Using a number of techniques-micromachining, microwriting, electron-beam lithography,(More)