Topographically structured substrates

Thus critical filling associated with first-order wetting seems to be difficult to come by. 

For a macroscopicly large slit of width L, capillary condensation is a first-order transition. The shift of the liquid-vapor coexistence curve P = Pi/l(.T) in the capillary relative to the bulk pressure P = Po(T ) is described by the Kelvin equation 8P = Po(T ) — i/t(f) 1/L. In the case of capped capillaries with a finite depth D and width L, capillary condensation becomes a continuous phase transition. There is a power law with corresponding critical exponents characterizing the unbinding of the meniscus from the bottom of the capped capillary if the pressure P approaches the 

Combined experimental and theoretical studies of a periodically grooved silicon substrate wetted by perfluoromethyl-cyclohexane have confirmed the occurrence of the aforementioned wetting regimes as a function of the undersaturation 8/j.. The 

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A. Moosavi, M. Rauscher, and S. Dietrich, Dynamics of nanodroplets on topographically structured substrates, / Phys. Condens. Matter, 21, 464120 (2009). 

Microcontact printing (p-CP) is another technique that can be used to place NAs onto different target surfaces. This technique makes use of an elastomeric stamp of polydimethylsiloxane (PDMS) and produces features with lateral resolution in the submicrometer range. The PDMS stamp is topographically structured by casting a PDMS prepolymer against a 3D master. The stamp is then inked with the molecules of interest, rinsed with buffer, blown dry under a stream of nitrogen, and then used to print the material onto the substrate surface (see Fig. 20). 

One of the original theories to account for the formation of the enzyme-substrate complex is the "lock and key" theory. The main concept of this hypothesis is that there is a topographical, structural compatibility between an enzyme and a substrate which optimally favors the recognition of the substrate as shown in Figure 2.3. 

In the present paper non-conventional TEM methods to characterize small metallic particles are presented. The topographic information on the particles shape can be combined with micro-diffraction (using STEM) data to obtain a full characterization of the particle. The case of gold particles evaporated on a NaCl substrate is used as example. The particle shapes observed are discussed. It is shown that many particles have a crystal structure which is different from the bulk (Fee). 

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