Measurements of thermal conductivity in a crystal quartz substrate at 1.4 K

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Abstract

We carried out measurements of thermal conductivity in a crystal quartz substrate (900 ¡m thick) at temperatures of 1.4 K by using a pumped 4He cryostat. We applied a varied input power from 0.1 up to 1 mW to the heater placed at the end of the substrate, and we observed that the measured data give a temperature dependence of k = 0.12T2.7 W/cm-K.

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Local characterization of hindered Brownian motion by using digital video microscopy and 3D particle tracking

Stefano Pagliara, Ulrich F Keyser, Simon L Dettmer (2014)

In this article we present methods for measuring hindered Brownian motion in the confinement of complex 3D geometries using digital video microscopy. Here we discuss essential features of automated 3D particle tracking as well as diffusion data analysis. By introducing local mean squared displacement-vs-time curves, we are able to simultaneously measure the spatial dependence of diffusion coefficients, tracking accuracies and drift velocities. Such local measurements allow a more detailed and appropriate description of strongly heterogeneous systems as opposed to global measurements. Finite size effects of the tracking region on measuring mean squared displacements are also discussed. The use of these methods was crucial for the measurement of the diffusive behavior of spherical polystyrene particles (505 nm diameter) in a microfluidic chip. The particles explored an array of parallel channels with different cross sections as well as the bulk reservoirs. For this experiment we present the measurement of local tracking accuracies in all three axial directions as well as the diffusivity parallel to the channel axis while we observed no significant flow but purely Brownian motion. Finally, the presented algorithm is suitable also for tracking of fluorescently labeled particles and particles driven by an external force, e.g. electrokinetic or dielectrophoretic forces.

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Author and article information

Journal

Journal ID (publisher-id): rmf

Title: Revista mexicana de física

Abbreviated Title: Rev. mex. fis.

Publisher: Sociedad Mexicana de Física (México, DF, Mexico )

ISSN (Print): 0035-001X

Publication date (Print and electronic): June 2013

Volume: 59

Issue: 3

Pages: 270-272

Affiliations

[01] San Mateo Cuanalá Puebla orgnameUniversidad Politécnica de Puebla México angel.colin@ 123456uppuebla.edu.mx

Article

Publisher ID: S0035-001X2013000300016 Publisher ID: S0035-001X(13)05900300016

SO-VID: ec5b6364-a19f-4206-b22c-39e16ffd4a8d

License:

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

History

Date accepted : 12 February 2013

Date received : 10 August 2012

Page count

Figures: 0, Tables: 0, Equations: 0, References: 9, Pages: 3

Product

SciELO Mexico