Dewetting of thin polymer films
WebWe investigate the creation of large area mesoscale structures by controlling the dewetting pathways of thin polymer films on physically heterogeneous substrates comprising a two-dimensional (2-D) array of square pillars. Depending on the initial configuration and thickness of the film, dewetting produces a variety of both ordered and disordered … WebJan 1, 2024 · Dewetting of polymer thin films particularly occur when coated onto non-wetting substrates and heated above the glass transition temperature. This results in polymer flow and rearrangement into a configuration that minimizes the net interfacial energy of the system [1]. The process of dewetting (or uncovering of the substrate by …
Dewetting of thin polymer films
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WebDec 5, 2006 · We study the dewetting of thin polymer films deposited on slippery substrate. Recent experiments on these systems have revealed many unexpected … Webthin polymer films. Dewetting can be greatly suppressed in high molecular weight (entangled) or glassy polymer films (T < T g) spun-cast from solution. It is difficult for these films to equilibrate so that surface energetics is less of a factor governing surface wetting. A shortcoming of this approach is that dewetting still tends to occur,
WebThe absence of solvent in the CVD process enables the growth of high-purity layers and avoids the potential of dewetting phenomena, which lead to pinhole defects. By limiting contaminants and defects, ultrathin (<10 nm) CVD polymeric device layers have been fabricated in multiple laboratories. ... Thicknesses of the polymer thin films were ... WebIn this paper we present a theoretical model for the dewetting of ultrathin polymer films. Assuming that the shear-thinning properties of these films can be described by a Cross …
WebMay 8, 2024 · While initial experiments on spontaneous instability of ultra-thin films involved simple homo-polymers such as PS, PMMA 5,6,7,8,9,10,11,12,13,14,15,16,17, dewetting of complex materials such as ... WebMay 13, 2002 · Dewetting of ultrathin polymer films near the glass transition exhibits unexpected front morphologies [G. Reiter, Phys. Rev. Lett. 87, 186101 (2001)]. Here, we present the first theoretical attempt to understand these features, focusing on the shear-thinning behavior of these films. We analyze the p …
WebJan 20, 2004 · Energetic considerations indicate that long-range Van der Waals forces stabilize thin polystyrene (PS) films against height fluctuations on silicon substrates. Nevertheless, we report here on the amplification of capillary waves of specific wavelengths for 15 nm thick PS films on silicon, ultimately leading to dewetting in a “spinodal-like” …
WebMay 24, 2016 · The presence of the acetone enriched layer accounts for the exponential kinetic behavior in the case of a thin PS film with low M w. However, the acetone enriched layer is not observed in the case of a thin PS film with high M w (M w = 400 kg mol −1) and the slippage effect of polymer chains is valid during the dewetting process. how many sig fig 1000WebNov 19, 2024 · The problem studied is represented in Fig. 1.A glassy polymer (such as PS) thin film of nominal thickness h 0 typically below 100 nm is lying on a substrate and heated well above its glass transition temperature T g.For a PS film, T g is about 100 °C and the temperature of the study, similar to the processing temperature, would be close to 200 … how many sig fig in 10.0WebAug 1, 1998 · Abstract. Dewetting of polystyrene (PS) films on a silicon substrate is investigated as a function of film thickness, h. We observe the nucleation of holes in the … how did maya angelou influence othersWebSep 1, 2007 · The dynamic dewetting of polymer films following exposure to thermal treatments or solvent vapors has been thoroughly studied, both experimentally and theoretically [39][40][41][42][43][44]. how did maya angelou impact the worldWebApr 19, 2024 · Thin polymer films on hydrophobic substrates are susceptible to rupture and hole formation. ... RA Weiss, Spinodal dewetting of thin polymer films. Phys Rev … how did maya angelou influence societyWebControlled the dewetting process of thin polymer films (ca. 16 nm) through controlled deposition of gold nanoparticles. Tenfold reduction in … how did mayan aztecs cleanseWebFeb 26, 2024 · The dewetting of thin films, which is a separation phenomenon induced by incompatible interfacial energies between the surface and film, is another useful method for micro/nanoscale separation or ... how many sig fig