magistrsko delo
Žiga Gregorin (Author), Natan Osterman (Mentor)

Abstract

V magistrskem delu je predstavljen nov način merjenja Soretovega koeficienta $S_T$, torej razmerja med termodifuzijsko in difuzijsko konstanto delca, ki se izvaja na posameznem delcu v tekočini. Gretje in hlajenje mikrokapilare na robovih omogoča, da se znotraj merilnega območja vzpostavi konstanten temperaturni gradient, pri katerem je možno opazovati termoforezno obnašanje mikrodelcev v več temperaturnih območjih. Izkaže se, da optična pinceta ne omogoča merjenja dovolj majhnih sil, zato je poudarek na merjenju hitrosti lezenja delca. $S_T$ je izračunan iz dobljenih hitrosti, prikazano pa je tudi, da je termoforezna sila odvisna od temperature okolice.

Keywords

dinamika tekočin;termodifuzija;termoforeza;koloidi;temperaturni gradient;optična pinceta;Soretov koeficient;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FMF - Faculty of Mathematics and Physics
Publisher: [Ž. Gregorin]
UDC: 532.7
COBISS: 3236196 Link will open in a new window
Views: 819
Downloads: 299
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Other data

Secondary language: English
Secondary title: Soret coefficient measurements on a single particle
Secondary abstract: A new way of measuring Soret coefficient $S_T$, ratio of thermal diffusion and diffusion coefficient, on a single particle in an aqueous solution is presented in the master's thesis. Heating and cooling of a microcapillary on the edges gives a constant value of temperature gradient along the whole measured area, allowing observation of the same sample at different temperatures. It turns out that optical tweezers do not allow measurements of small enough forces, caused by thermophoresis, so the emphasis is on particle drift velocity measurement. From acquired velocities, $S_T$ can be calculated and by measurements at different temperatures it is presented, that thermophoresis is dependent on absolute temperature of the environment.
Secondary keywords: fluid dynamics;thermodiffusion;thermophoresis;colloids;temperature gradient;optical tweezers;Soret coefficient;
Type (COBISS): Master's thesis/paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Fak. za matematiko in fiziko, Oddelek za fiziko
Pages: 48 str.
ID: 10959125