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29 Sep 2008

Volume 93, Issue 13, Articles (13xxxx)

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Appl. Phys. Lett. 93, 132101 (2008); http://dx.doi.org/10.1063/1.2988720 (3 pages)

Yueh-Nan Chen and Lukas Gilz
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Investigations on the self propagating reactions of nickel and aluminum multilayered foils

Ibrahim Emre Gunduz, Konrad Fadenberger, Maria Kokonou, Claus Rebholz, and Charalabos C. Doumanidis

Appl. Phys. Lett. 93, 134101 (2008); http://dx.doi.org/10.1063/1.2994670 (3 pages) | Cited 13 times

Online Publication Date: 30 September 2008

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The self-propagating reaction of nickel-aluminum thin film multilayers with a bilayer thickness of ∼ 43 nm was investigated using high-speed optical camera and infrared thermometry. The results indicate a two-stage reaction with two different characteristic temperatures. Following ignition, the flame front propagates near the reverse peritectic transformation temperature of Ni2Al3 into NiAl and liquid at 1406 K. The reaction continues with the growth of NiAl until the melting temperature of 1911 K is reached. The reaction mechanism and kinetics are discussed.
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82.33.Vx Reactions in flames, combustion, and explosions
81.05.Cy Elemental semiconductors
82.20.-w Chemical kinetics and dynamics
06.60.Jn High-speed techniques (microsecond to femtosecond)
07.20.Dt Thermometers

In situ measurement of the permittivity of helium using microwave NbN resonators

G. J. Grabovskij, L. J. Swenson, O. Buisson, C. Hoffmann, A. Monfardini, and J.-C. Villégier

Appl. Phys. Lett. 93, 134102 (2008); http://dx.doi.org/10.1063/1.2996263 (3 pages) | Cited 4 times

Online Publication Date: 3 October 2008

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By measuring the electrical transport properties of superconducting NbN quarter-wave resonators in direct contact with a helium bath, we have demonstrated a high-speed and spatially sensitive sensor for the permittivity of helium. In our implementation an ∼ 10−3 mm3 sensing volume is measured with a bandwidth of 300 kHz in the temperature range of 1.8–8.8 K. The minimum detectable change in the permittivity of helium is calculated to be ∼ 6×10−11 ϵ0/Hz1/2 with a sensitivity of the order of 10−13 ϵ0/Hz1/2 easily achievable. Potential applications include operation as a fast, localized helium thermometer and as a transducer in superfluid hydrodynamic experiments.
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77.22.Ch Permittivity (dielectric function)
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