On the elusive nature of Carbopol gels: “model”, weakly thixotropic, or time-dependent viscoplastic materials?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F20%3A00524753" target="_blank" >RIV/61389013:_____/20:00524753 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22310/20:43920894

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0377025720300835?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0377025720300835?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnnfm.2020.104315" target="_blank" >10.1016/j.jnnfm.2020.104315</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On the elusive nature of Carbopol gels: “model”, weakly thixotropic, or time-dependent viscoplastic materials?

Popis výsledku v původním jazyce

The question of whether Carbopol gels always behave as “model” yield stress material is addressed experimentally. Prompted by several simple hydrodynamic experiments performed with Carbopol gels that can not be fully understood within the commonly accepted “model” picture, we revisit the yielding behaviour of a Carbopol gel. When subjected to a loading/unloading process, the yielding of the Carbopol is gradual and exhibits a rheological hysteresis. By in-situ visualisation of the microstructure it is demonstrated that these features do not originate from a micro-structural damage of the micro-gel. A systematic description of the role of the rate at which the material is forced (loaded or unloaded) on the yielding scenario is given. In closing, the question of how simple a scalar model can be and yet accurately describe the experimentally observed yielding scenario of a Carbopol gel in a rheometric flow is addressed. It is concluded that simple scalar models may do such job as long as they are not too simple and include a minimal amount of physical ingredients.

Název v anglickém jazyce

On the elusive nature of Carbopol gels: “model”, weakly thixotropic, or time-dependent viscoplastic materials?

Popis výsledku anglicky

The question of whether Carbopol gels always behave as “model” yield stress material is addressed experimentally. Prompted by several simple hydrodynamic experiments performed with Carbopol gels that can not be fully understood within the commonly accepted “model” picture, we revisit the yielding behaviour of a Carbopol gel. When subjected to a loading/unloading process, the yielding of the Carbopol is gradual and exhibits a rheological hysteresis. By in-situ visualisation of the microstructure it is demonstrated that these features do not originate from a micro-structural damage of the micro-gel. A systematic description of the role of the rate at which the material is forced (loaded or unloaded) on the yielding scenario is given. In closing, the question of how simple a scalar model can be and yet accurately describe the experimentally observed yielding scenario of a Carbopol gel in a rheometric flow is addressed. It is concluded that simple scalar models may do such job as long as they are not too simple and include a minimal amount of physical ingredients.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of Non-Newtonian Fluid Mechanics

ISSN

0377-0257

e-ISSN

—

Svazek periodika

281

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

16

Strana od-do

104315

Kód UT WoS článku

000541258000012

EID výsledku v databázi Scopus

2-s2.0-85085554014