Spheroidal Microparticle Monolayers Characterized by Streaming Potential Measurements
PBN-AR
Instytucja
Centrum Badań Molekularnych i Makromolekularnych Polskiej Akademii Nauk
Źródłowe zdarzenia ewaluacyjne
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Główny język publikacji
EN
Czasopismo
Langmuir (35pkt w roku publikacji)
ISSN
0743-7463
EISSN
Wydawca
AMER CHEMICAL SOC
DOI
URL
Rok publikacji
2017
Numer zeszytu
38
Strony od-do
9916-9925
Numer tomu
33
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EN
Treść
An efficient method was developed enabling the synthesis of spheroidal polymer microparticles. Thorough physicochemical characteristics of the particles were acquired comprising the size, shape, electrophoretic mobility, and the diffusion coefficient. The particles were monodisperse, and their shape was well-fitted by prolate spheroids having the axis ratio equal to 4.17. Knowing the diffusion coefficient, their hydrodynamic diameter of 449 nm was calculated, which matched the value derived from Brenner's analytical expression. Particle deposition kinetics on mica and silicon/silica substrates, modified by poly(allylamine hydrochloride) (PAH) adsorption, was studied by optical microscopy and AFM imaging. The validity of the random sequential adsorption model was confirmed. Additionally, monolayers of the particles on these substrates were thoroughly characterized in situ by the streaming potential measurements for different ionic strengths. These measurements confirmed that the ζ potential change with the spheroidal particle coverage is less abrupt than for spheres and agrees with theoretical predictions. Exploiting these results, a useful analytical expression was derived that allows one to calculate the spheroidal particle coverage in situ via the streaming potential measurements. This expression, especially accurate for low coverage range, can be used for a quantitative interpretation of adsorption and desorption kinetics of anisotropic macromolecules, e.g., proteins on solid substrates. © 2017 American Chemical Society.
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System-identifier
PX-59d73b3bd5defae7ede4b04b
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