20.500.12556/RUL-102916 Meritev Soretovega koeficienta na posameznem mikrodelcu Soret coefficient measurements on a single particle 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. 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. termoforeza Soretov koeficient temperaturni gradient koloidi optična pinceta thermophoresis Soret coefficient temperature gradients colloids optical tweezers true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2018-09-12 07:45:43 2018-09-12 07:45:51 2022-08-16 03:38:53 0000-00-00 00:00:00 2018 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 89886 3236196 261.pdf 261.pdf 1 C6C85FCDE6615F10067BD91E203E540B 6d339e05075adfb1db70854d9f51df67d7c1d321650372b1e15744b8f013b3b8 a8dc979f-a1b5-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=113293 Fakulteta za matematiko in fiziko 0 0 0