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30 Jan 2012

Volume 100, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 100, 053101 (2012); http://dx.doi.org/10.1063/1.3679127 (3 pages)

Shinya Kano, Yasuyuki Yamada, Kentaro Tanaka, and Yutaka Majima
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Thermally induced secondary atomization of droplet in an acoustic field

Saptarshi Basu, Abhishek Saha, and Ranganathan Kumar

Appl. Phys. Lett. 100, 054101 (2012); http://dx.doi.org/10.1063/1.3680257 (4 pages) | Cited 4 times

Online Publication Date: 1 February 2012

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We study the thermal effects that lead to instability and break up in acoustically levitated vaporizing fuel droplets. For selective liquids, atomization occurs at the droplet equator under external heating. Short wavelength [Kelvin-Helmholtz (KH)] instability for diesel and bio-diesel droplets triggers this secondary atomization. Vapor pressure, latent heat, and specific heat govern the vaporization rate and temperature history, which affect the surface tension gradient and gas phase density, ultimately dictating the onset of KH instability. We develop a criterion based on Weber number to define a condition for the inception of secondary atomization.
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47.55.df Breakup and coalescence
47.20.Dr Surface-tension-driven instability
68.03.Cd Surface tension and related phenomena
47.80.Jk Flow visualization and imaging

Tailoring of electro-optical properties of ferroelectric liquid crystals by doping Pd nanoparticles

A. Kumar, G. Singh, T. Joshi, G. K. Rao, A. K. Singh, and A. M. Biradar

Appl. Phys. Lett. 100, 054102 (2012); http://dx.doi.org/10.1063/1.3681381 (4 pages)

Online Publication Date: 2 February 2012

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We demonstrate here the tailoring of electro-optical properties of ferroelectric liquid crystals (FLCs) by doping different concentrations of Selenium Docosane (SD) capped palladium nanoparticles (PdNPs). The operating voltage is lowered by ∼50% in doped FLC as compared to undoped one. The remarkable increment in optical tilt angle of doped FLC is monitored, which is concentration-dependent. The steric interactions among alkyl chains of SD capped PdNPs and FLC molecules could be the probable reason for enhanced optical tilt angle. More importantly, present investigations on doped FLCs are indicative of their indispensible impact on next generation FLCs-based electro-optical devices.
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78.20.Jq Electro-optical effects
61.72.up Other materials
78.15.+e Optical properties of fluid materials, supercritical fluids and liquid crystals
61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order
77.80.Dj Domain structure; hysteresis
77.84.Nh Liquids, emulsions, and suspensions; liquid crystals
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