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Meritev viskoelastičnih lastnosti snovi z dvotočkovno pasivno mikroreologijo
Gosar, Žiga (Author), Osterman, Natan (Mentor) More about this mentor... This link opens in a new window

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Abstract
V magistrskem delu je predstavljena meritev viskoelastičnih lastnosti (kompleksnega strižnega modula $G^*$) snovi z dvotočkovno pasivno mikroreologijo. Pri pasivni mikroreologiji gre za opazovanje Brownovega gibanja mikroskopskih delcev, kjer izmerimo povprečen kvadrat odmika delca v odvisnosti od časa. S pomočjo posplošene Stokes-Einsteinove enačbe pretvorimo rezultat v frekvenčno odvisen kompleksen strižni modul. Pri pasivni dvotočkovni mikroreologiji namesto povprečnega kvadrata odmika opazujemo povprečen tenzorski produkt odmikov različnih delcev, oziroma z drugimi besedami, korelirano gibanje parov delcev. Implementiral sem enotočkovno in dvotočkovno pasivno mikroreologijo in njeno delovanje preveril na simulacijah viskoznih in viskoelastičnih snovi, meritvah mešanice glicerola in vode, ter agaroznem gelu.

Language:Slovenian
Keywords:Brownovo gibanje, mikroreologija, viskoelastičnost
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:FMF - Faculty of Mathematics and Physics
Year:2019
COBISS.SI-ID:3371108 This link opens in a new window
Views:419
Downloads:146
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Secondary language

Language:English
Title:Measurement of viscoelastic properties with two-point passive microrheology
Abstract:
Two-point passive microrheology is presented in this master's thesis. Passive microrheology observes Brownian motion of microscopic particles embedded in a material. Mean square displacement is measured and used to calculate complex modulus ($G^*$) using generalized Stokes-Einstein relation. With two-point microrheology, the correlated motion of distinct particles is used instead of mean square displacement. I implement one-point and two-point passive microrheology. Simulations were used to compare one-point and two-point microrheological results as well as measurements performed in water and glycerol mixtures and agarose gel.

Keywords:Brownian motion, microrheology, viscoelasticity

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