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16 Jul 2012

Volume 101, Issue 3, Articles (03xxxx)

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Appl. Phys. Lett. 101, 033301 (2012); http://dx.doi.org/10.1063/1.4734240 (5 pages)

Ting-Gang Chen, Bo-Yu Huang, En-Chen Chen, Peichen Yu, and Hsin-Fei Meng
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Snap-in dynamics of single particles to water drops

Longquan Chen, Lars-Oliver Heim, Dmytro S. Golovko, and Elmar Bonaccurso

Appl. Phys. Lett. 101, 031601 (2012); http://dx.doi.org/10.1063/1.4737210 (5 pages) | Cited 1 time

Online Publication Date: 16 July 2012

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The interaction between solid particles and gas-liquid interfaces is relevant in technological applications. Former studies did focus on detachment-dynamics of particles from thin liquid films or on attachment-dynamics of particles to gas bubbles. Here, we investigated snap-in dynamics of individual micron-sized particles to water drops by means of the colloidal probe technique. The snap-in time (∼0.1 ms) and the snap-in force of hydrophilic and hydrophobic particles were measured. The snap-in time increased with particle size regardless of wettability. The snap-in force increased with particle size and wettability. We show that the snap-in dynamics is dominated by capillarity and inertia.
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47.55.D- Drops and bubbles
47.55.nb Capillary and thermocapillary flows
68.08.Bc Wetting
68.15.+e Liquid thin films
82.70.Dd Colloids

Critical influence of target-to-substrate distance on conductive properties of LaGaO3/SrTiO3 interfaces deposited at 10−1 mbar oxygen pressure

C. Aruta, S. Amoruso, G. Ausanio, R. Bruzzese, E. Di Gennaro, M. Lanzano, F. Miletto Granozio, Muhammad Riaz, A. Sambri, U. Scotti di Uccio, and X. Wang

Appl. Phys. Lett. 101, 031602 (2012); http://dx.doi.org/10.1063/1.4737650 (5 pages) | Cited 1 time

Online Publication Date: 18 July 2012

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We investigate pulsed laser deposition of LaGaO3/SrTiO3 at 10−1 mbar oxygen background pressure, demonstrating the critical effect of the target-to-substrate distance, dTS, on the interface sheet resistance, Rs. The interface turns from insulating to metallic by progressively decreasing dTS. The analysis of the LaGaO3 plume evidences the important role of the plume propagation dynamics on the interface properties. These results demonstrate the growth of conducting interfaces at an oxygen pressure of 10−1 mbar, an experimental condition where a well-oxygenated heterostructures with a reduced content of oxygen defects is expected.
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72.20.Fr Low-field transport and mobility; piezoresistance
72.80.Sk Insulators
81.15.Fg Pulsed laser ablation deposition
61.72.jd Vacancies
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