Journal ArticleDOI
Dynamics of dewetting.
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In this paper, a dry spot at the center of a silicone wafer was nucleated and the rate of growth was observed to be independent of R, independent of the film thickness, inversely proportional to the oil viscosity, and very sensitive to the value of the equilibrium contact angle between oil and wafer.Abstract:
Films of silicone oils (or alkanes) deposited on low-energy surfaces (grafted silicone wafers) are metastable. We nucleate a dry spot at the center of the wafer and observe the rate of growth V=dR/dt of the dry patch of radius R. We find that V is (a) independent of R, (b) independent of the film thickness, (c) inversely proportional to the oil viscosity, and (d) very sensitive to the value of ${\mathrm{\ensuremath{\theta}}}_{\mathit{e}}$, the equilibrium contact angle between oil and wafer. At small ${\mathrm{\ensuremath{\theta}}}_{\mathit{e}}$, V\ensuremath{\approxeq}${\mathrm{\ensuremath{\theta}}}_{\mathit{e}}^{3}$. All these features are in agreement with a recent hydrodynamic theory.read more
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Journal ArticleDOI
Wetting and Spreading
TL;DR: In this article, the surface forces that lead to wetting are considered, and the equilibrium surface coverage of a substrate in contact with a drop of liquid is examined, while the hydrodynamics of both wetting and dewetting is influenced by the presence of the three-phase contact line separating "wet" regions from those that are either dry or covered by a microscopic film.
Journal ArticleDOI
Moving Contact Lines: Scales, Regimes, and Dynamical Transitions
TL;DR: In this article, the authors discuss experimental and theoretical progress revealing the physical mechanisms behind dynamical wetting transitions and discuss microscopic processes that have been proposed to resolve the moving contact line paradox and identify the different dynamical regimes of contact line motion.
Journal ArticleDOI
Large-area graphene-based nanofiltration membranes by shear alignment of discotic nematic liquid crystals of graphene oxide.
Abozar Akbari,Phillip Sheath,Samuel T. Martin,Dhanraj B. Shinde,Mahdokht Shaibani,Parama Chakraborty Banerjee,Rachel Tkacz,Dibakar Bhattacharyya,Mainak Majumder +8 more
TL;DR: It is demonstrated that the discotic nematic phase of graphene oxide (GO) can be shear aligned to form highly ordered, continuous, thin films of multi-layered GO on a support membrane by an industrially adaptable method to produce large-area membranes.
Journal ArticleDOI
Electrochemical Principles for Active Control of Liquids on Submillimeter Scales
Benedict S. Gallardo,Vinay Gupta,Franklin D. Eagerton,Lana I. Jong,Vincent S. J. Craig,Rahul R. Shah,Nicholas L. Abbott +6 more
TL;DR: Electrochemical methods were combined with redox-active surfactants to actively control the motions and positions of aqueous and organic liquids on millimeter and smaller scales to guide droplets of organic liquids through simple fluidic networks.
Journal ArticleDOI
Continuous and scalable fabrication of transparent conducting carbon nanotube films.
TL;DR: It is shown how to combine different surfactants to make uniform dispersions with high concentration of SWNTs and optimal rheological behavior for coating and drying, including preventing dewetting and film rupture that has plagued earlier attempts.