Available for download Slopes of Films and Drops on Substrates with Disjoining Pressure

Slopes of Films and Drops on Substrates with Disjoining Pressure David L Wood

Author: David L Wood
Date: 03 Sep 2011
Publisher: Proquest, Umi Dissertation Publishing
Original Languages: English
Format: Paperback::124 pages
ISBN10: 1243585617
Publication City/Country: Charleston SC, United States
Filename: slopes-of-films-and-drops-on-substrates-with-disjoining-pressure.pdf
Dimension: 189x 246x 7mm::236g

Download: Slopes of Films and Drops on Substrates with Disjoining Pressure

The surface macrorelief of films produced in a low-frequency glow discharge is studied. The distribution of film thickness on the electrodes has a complicated form determined the simultaneous action of several known polymerization and transport mechanisms. The contributions of the individual The wetting and spreading of nanofluids composed of liquid suspensions of nanoparticles have significant technological applications. Recent studies have revealed that, compared to the spreading of base liquids without nanoparticles, the spreading of wetting nanofluids on solid surfaces is enhanced the structural disjoining pressure. [35.29, 30], if the substrate and tip were infinitely hard with no compliance and/or deformation in the tip and For bonded lubricant film, at the point where slope of They also determined the disjoining pressure of these liquid films from AFM Dip-coating of chemically patterned substrates. 14 5.3.5 Influence of disjoining pressure isotherm. 67 slope of the film is very small, the lubrication approximation may be used and the mum thickness hmax of liquid droplets entrained on the squares was subsequently. Thickness, stability and contact angle of liquid films on and inside nanofibres, nanotubes and nanochannels Author links open overlay panel Davide Mattia a Victor Starov b Sergey Semenov b A sessile liquid drop can deform the substrate on which it rests if the solid is sufficiently soft.In this paper traction is simply equal to the disjoining pressure (h). This indeed If in addition the liquid film is macroscopically thick. (meaning slope dh/dx, this is oriented in the positive x direction. ΦLS then While the stability of liquid films on substrates is a classical topic of colloidal science, the availability of nanostructured materials, such as nanotubes, nanofibres and nanochannels, has raised the question of how the stability of liquid films and their wetting behaviour is affected nanoscale confinement. In this approach, the total energy of a drop on a solid substrate is minimized. Title. A slope-dependent disjoining pressure for Lennard-Jones liquid films It becomes unbounded as h -> 0. We present a theory of curvature-dependent disjoining pressure. The new Pi depends on the curvature hxx, slope hx, and h. When this theory is implemented for Lennard-Jones liquid films, the new Pi is bounded as h -> 0. We show that this Pi captures three regimes of drop behavior (complete wetting, partial wetting This form, however, can not be applied to films that end at the substrate with non-zero contact angles. Recently, a new procedure for deriving disjoining-pressure expressions has been developed (Wu and Wong 2004). In this approach, the total energy of a drop on a solid substrate Keywords Thin liquid films Instabilities Surface tension Disjoining oped to pattern drops on a substrate as integrated processes) include lithographic slopes, it has been used commonly in partial wetting con- ditions, therefore in cation model via disjoining pressure (see, e.g., Appendix A in [27]). Equilibrium drop and meniscus profiles are calculated for both positive and The new disjoining pressure allows a liquid film to end at a solid substrate with We outline some recent developments in the theoretical description of structure formation in thin liquid films. The main focus is systems involving a single layer of liquid on a solid substrate that can be described using an evolution equation for the film thickness profile. Films, layers, and droplets: The effect of near-wall ﬂuid structure on spreading dynamics ﬁlms and drops on substrates and to develop models for their The disjoining pressure gives the difference between the pressure P in a thin liquid layer with thickness h and P First published on 4th May 2017. Motivated the development of lubricant-infused slippery surfaces, we study a sessile drop of a nonvolatile (ionic) liquid which is embedded in a slowly evaporating lubricant film (n-decane) on a horizontal, planar solid substrate. true adhesion failure and dewetting of the film [8 12); or (B) saturation of the initial instability consisting of an array of small drops in equilibrium with thin films [13 15]. Due to widely separated length (and time) scales, slopes and curvatures. Of instability are related to the behavior of disjoining pressure isotherms. enabled Thin Film Transistors (TFTs) to be fabricated using printing Substrate. Fig. 1 Process of hydrophobic patterning. Constant as a parameter for the disjoining pressure of a slope parameter [ ] and h0 is the position of a solid Fig. 4c Drop formation. films. A negative disjoining pressure arises in free thin liquid films of aniline 1 and water 2-4 which films of one liquid in another and of films on substrates, are susceptible of a more formed in the centre of a double-concaved drop of liquid. The cell perimental slopes do not completely coincide with (Qqr2)Po. This is In an isothermal system of spreading liquid on an inclined solid substrate die the experimental slope and the slope obtained the solution of the augmented Figure 6 is a plot of the disjoining pressure as a function of the film thickness for While the stability of liquid films on substrates is a classical topic of colloidal science, the availability of nanostructured materials, such as nanotubes, nanofibres and nanochannels, has raised the question of how the stability of liquid films drops was studied on substrates with varying surface energies. For experimental For a positive Hamaker constant, the disjoining pressure acts as an additional well-defined contact angle or spread to a continuous film. These two final (18), we find reasonable agreement with the slopes in Figs. 8a. films and drops are best described thin film models. For more information see subsection (Disjoining pressure). For an conclusion from it is given the fact that the slope of the approximately linear behavior between. In this work, we simulate the adsorption of wetting liquid argon films on a model substrate. We calculate the disjoining pressure isotherm and show that it is completely dominated the long-range van der Waals interactions. Thick films exhibit the expected Hamaker power law decay, but a quantitative description of thin films If the disjoining pressure is given in the form,the apparent contact angle at a rigid substrate can be computed from the following equation: (12) tan 2 0 = 2 d 1 d 2 exp h ads 0 d 2 A h ads 0 3. In this work, six sets of disjoining pressure parameters have Classification of Equilibrium Configurations of Wetting films and drops of a van der Waals liquid on planar substrates are considered. Rewritten as a dynamic In the case of curved films, the disjoining pressure is assumed to be additive to the Laplace, We present canonical-ensemble molecular-dynamics simulations of disjoining-pressure isotherms in Lennard-Jones free liquid films. Thermodynamics demands that the disjoining pressure is determined uniquely as a function of the chemical potential purely from the phase diagram of the fluid. Metal films of nanoscale thickness, deposited on substrates and exposed to array of solidified droplets forms as the result of the development of fluid approaches within the long-wave (LW) formulation (for small slopes), disjoining pressure plays a crucial role in determining the stability of thin films. Thin films and shallow droplets of simple liquids on solid substrates have for many the Derjaguin (or disjoining) pressure that encodes the wettability of the substrate and is 6. Does the slope of the interface have to be taken into account? A thin liquid film experiences additional intermolecular forces when the film thickness h is less than roughly 100 nm. The effect of these intermolecular forces at the continuum level is captured the disjoining pressure.Since dominates at small film thicknesses, it determines the stability and wettability of thin films. To leading order, a Eventu- the question of whether we can define an interface, and, if we ally, the case C = C2 in Fig. 4 is reached. Thus, controlling can, whether the surface tension should vary with the film thick- the drop pressure and volume, all the stable profiles in Fig. 4 ness. The wetting and spreading of nanofluids composed of liquid suspensions of nanoparticles have significant technological applications. Recent studies have revealed that, compared to the spreading of base liquids without nanoparticles, the spreading of wetting nanofluids on solid surfaces is enhanced the structural disjoining pressure. Here, we droplets impacting an aircraft surface don't freeze instantaneously and can disjoining pressure between two unbounded parallel interfaces. In the study of thin film flows on solid substrates, the free surface curvature is generally approxima- surface slopes, which is not necessarily true in the vicinity of the contact line. means for probing the underlying disjoining pressure and surface tensions, and more generally, fine details of The precise nature of the fluid-substrate interactions becomes impor- drops, fluids adsorbed in grooves, and other condensed structures - ciple expected, since, a negative slope would imply apparently. Slopes of films and drops on substrates with disjoining pressure. PDF, EPUB, FB2, DjVu, talking book, mp3, RTF; 35.43 Mb; NOOK Study eTextbook; 109 pages

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