A swellable polyelectrolyte gel-like layer on the surface of hydrous metal oxides in simple electrolyte solutions: Hematite vs. silica colloids

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F17%3A10367697" target="_blank" >RIV/00216208:11310/17:10367697 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.colsurfa.2016.11.018" target="_blank" >https://doi.org/10.1016/j.colsurfa.2016.11.018</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.colsurfa.2016.11.018" target="_blank" >10.1016/j.colsurfa.2016.11.018</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A swellable polyelectrolyte gel-like layer on the surface of hydrous metal oxides in simple electrolyte solutions: Hematite vs. silica colloids

Popis výsledku v původním jazyce

To elucidate the puzzling surface structure of hydrophilic colloidal particles of metal oxides dispersed in aqueous solutions, we reanalysed seemingly anomalous coagulation kinetics experiments carried out by various authors on nonporous as well as porous near-spherical iron oxide-hematite colloids synthesized by forced hydrolysis. The swelling degree of the shell (mimicking a loose gel layer of uniform fixed charge due to the ionization of functional groups) of the core-shell- modelled crystalline colloids was found to scale with the concentration of coagulating uni-univalent electrolyte according to the simple power law with the exponent of -3/5. In polymer physics, this scaling law was derived for swellable polyelectrolyte gels with a low degree of crosslinking, in which a delicate balance between competing thermodynamic forces is established. The same scaling law has recently been found by us to apply in colloidal systems of amorphous silica, indicating a more generalizable appearance of the swelling gel phase at the metal oxide/solution interface than previously thought.

Název v anglickém jazyce

A swellable polyelectrolyte gel-like layer on the surface of hydrous metal oxides in simple electrolyte solutions: Hematite vs. silica colloids

Popis výsledku anglicky

To elucidate the puzzling surface structure of hydrophilic colloidal particles of metal oxides dispersed in aqueous solutions, we reanalysed seemingly anomalous coagulation kinetics experiments carried out by various authors on nonporous as well as porous near-spherical iron oxide-hematite colloids synthesized by forced hydrolysis. The swelling degree of the shell (mimicking a loose gel layer of uniform fixed charge due to the ionization of functional groups) of the core-shell- modelled crystalline colloids was found to scale with the concentration of coagulating uni-univalent electrolyte according to the simple power law with the exponent of -3/5. In polymer physics, this scaling law was derived for swellable polyelectrolyte gels with a low degree of crosslinking, in which a delicate balance between competing thermodynamic forces is established. The same scaling law has recently been found by us to apply in colloidal systems of amorphous silica, indicating a more generalizable appearance of the swelling gel phase at the metal oxide/solution interface than previously thought.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Colloids and Surfaces A: Physicochemical and Engineering Aspects

ISSN

0927-7757

e-ISSN

—

Svazek periodika

513

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

5

Strana od-do

463-467

Kód UT WoS článku

000390365500054

EID výsledku v databázi Scopus

2-s2.0-85002374040