Activation Energy for Mobility of Dyes and Proteins in Polymer Solutions: From Diffusion of Single Particles to Macroscale Flow
PBN-AR
Instytucja
Instytut Chemii Fizycznej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
PHYSICAL REVIEW LETTERS
ISSN
0031-9007
EISSN
1079-7114
Wydawca
AMER PHYSICAL SOC
DOI
URL
Rok publikacji
2013
Numer zeszytu
22
Strony od-do
228301-1-5
Numer tomu
111
Identyfikator DOI
Liczba arkuszy
Streszczenia
Język
en
Treść
We measure the activation energy Ea for the diffusion of molecular probes (dyes and proteins of radii from 0.52 to 6.9 nm) and for macroscopic flow in a model complex liquid-aqueous solutions of polyethylene glycol. We cover a broad range of polymer molecular weights, concentrations, and temperatures. Fluorescence correlation spectroscopy and rheometry experiments reveal a relationship between the excess of the activation energy in polymer solutions over the one in pure solvent Delta E-a and simple parameters describing the structure of the system: probe radius, polymer hydrodynamic radius, and correlation length. Delta E-a varies by more than an order of magnitude in the investigated systems (in the range of ca. 1-15 kJ/mol) and for probes significantly larger than the polymer hydrodynamic radius approaches the value measured for macroscopic flow. We develop an explicit formula describing the smooth transition of Delta Ea from the diffusion of molecular probes to macroscopic flow. This formula is a reference for the quantitative analysis of specific interactions of moving nano-objects with their environment as well as active transport. For instance, the power developed by a molecular motor moving at constant velocity u is proportional to u(2) exp(E-a/RT).
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
675683
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