Dewetting dynamics

The driving force Fj, which is the negative spreading coefficient S, 

A stronger molecular interaction of liquid and sohd molecules, that is, an ideal (Newtonian) hquid on a sohd 

The profile near liquid wedges, where the dissipation dominates, can be estimated approximately by the dynamic contact angle 0 via = 9 x. It then leads to 

Taking into account that the moving velocity of the 

The numerical dissipation factor k = n 6gUb) is expected to be of order 10 [27]. Considering the substrate is ideal flat, the radius of hole, R, grows linearly with time t,R t. 

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K. R. Shull, T. E. Karis. Dewetting dynamics for large equilibrium contact angles. Langmuir 70 334-339, 1994. 

IV. DEWETTING DYNAMICS HARD VERSUS SOFT SUBSTRATES... 

The technique used to study dewetting dynamics on materials consists of making a flat, smooth elastomer surface. A hquid puddle is deposited within a 50-mm-diameter ring of 0.1-mm-thick plasticized adhesive paper adhering to the substrate. The adhesive paper acts as a spacer. A microscope slide is drawn over the liquid to obtain a liquid film of ca. 0.1-mm thickness. At this thickness, the liquid film is unstable, being much less than the equilibrium value, of ca. 1.5 mm calculated from Eq. (29). Nucleation of dry patches... 

More accurate descriptions of the assembly m hanism need to take into account the dewetting dynamics, particle-surface interaction and particle-particle forces. It was observed that the... 

In devices like thin-film transistors (TFTs), multilayered stmctures are often introduced so that the stability/instability of a multilayered polymer film is of even more practical importance. However, the dewetting of a thin polymer film on top of another polymer layer is much more complicated than the common liquid-solid case, as both the polymer-polymer interface and the free film surface are deformable. Taking an immiscible bilayer as an example, dewetting dynamics of the top layer depends mainly on the relative viscosities of the two liquids, the thicknesses of respective liquid layers, and the surface and interfacial tensions involved [63,64]. For a very viscous sub-layer ( /, > where and are viscosity... 

Adicoff, Dynamic Mechanical Behavior of Highly Filled Polymers Dewetting Effect , Rept No NWC-TP-5486 (1971) 11) H. Yasu-... 

Spreading dynamics plays a key role in numerous applications. However, controlling the dewetting of liquids may be potentially more important for some industrial uses. 

The entropic arguments have been used to explain many unusual phenomena, such as dewetting of polymer brushes by the melt of the same polymer [301 ] and enrichment of the surface with lower molecular weight component [302], which are not observed for simple liquids. Also wetting dynamics is strongly af-... 

When adsorbed (from ambient air), water molecules might act as plasticizers and alter the dynamics of polymers. Moreover, water has a strong dipole moment and, consequently, dielectric active relaxation processes, which could partially occlude significant parts of the dielectric spectra of interest. Special attention to this effect has to be paid when the dynamics of thin polymer films is investigated, for example in relation to phenomena like the glass transition, dewetting, pattern formation, surface mobility etc. 

H. Schubert, Kapillaritat in porosen Systemen, Springer (1982). (Emphasis on capillary bridges in porous systems, static and dynamic systems, wetting and dewetting. The book was primarily intended for engineers.)... 

So far we have described in some detail the development of wetting layers by accretion. Obviously, the other direction is also possible a thick, macroscopic liquid layer on a solid can thin (by gravity, evaporation or capillary suction) until the layers become of colloidal thickness. Eventually, the same final situation should be attained, unless the dynamics of dewetting leads to hysteresis. 

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