Repositorio UFRO · Omeka S

Impact of cooling rate and shear flow on crystallization and mechanical properties of wax-crystal networks

Primer Autor	Marangoni, Alejandro G.
Co-autores	Werner-Carcamo, Erwin R. Rubilar, Monica Macias-Rodriguez, Braulio A.
Título	Impact of cooling rate and shear flow on crystallization and mechanical properties of wax-crystal networks
Editorial	AIP Publishing
Revista	PHYSICS OF FLUIDS
Lenguaje	en
Resumen	Wax oleogels are one of the most promising strategies to produce trans-fat free and low-saturate functional fats. Under quiescent isothermal conditions, waxes form strong space-filling networks where oil is embedded. Nevertheless, in industrial processes, crystallization conditions deviate significantly from being isothermal and quiescent, yet these far from equilibrium conditions have received limited attention in the literature. Cooling and shear rate gradients during crystallization can promote molecular alignment, crystal growth, and crystal network reorganization that hold the potential to tune the mechanical properties of oleogels. Therefore, this study aimed to investigate the impact of different controlled cooling and shear rates during the crystallization process of beeswax oleogels. An analysis of both small and large amplitude oscillatory shear was conducted to understand the linear and nonlinear mechanical properties of oleogels. Additionally, microscopic/macroscopic analyses, including oil-binding capacity, were performed. The results indicate that sheared oleogels display plastic-like behavior, lower linear elastic moduli, and a higher perfect plastic dissipation ratio than oleogels cooled under quiescent conditions, which displayed stiff, brittle-like characteristics. In addition, these oleogels displayed a microstructure with smaller crystals than oleogels cooled under quiescent conditions. This phenomenon can be attributed to a transition of oleogels from a strong, yet brittle interconnected particle network, to a dispersion of jammed crystal particles that align more easily along the direction of flow, resulting in minimal additional contribution from viscous stress after yielding. Therefore, a controlled cooling and shear rate application is an effective method to tune the mechanical properties of wax oleogels.
Fecha Publicación	2023
Tipo de Recurso	artículo original
Description	Los autores agradecen el apoyo financiero de la Universidad de La Frontera a través de la Beca para promover la Internacionalización (Proyecto FRO1999), el Proyecto Fondecyt de la Agencia Nacional de Investigación y Desarrollo de Chile (ANID, N grados 1200942), y el Consejo de Investigaciones en Ciencias Naturales e Ingeniería de Canadá, Beca No. RGPIN2020-04983. Se agradece la asistencia técnica de Nicole Shaw con mediciones de reología y microscopía.
doi	10.1063/5.0162427
Formato Recurso	PDF
Ubicación del archivo	http://dx.doi.org/10.1063/5.0162427
Categoría OCDE	Mechanics Physics, Fluids & Plasmas
Disciplinas de la OCDE	Ingeniería de los Materiales
Id de Web of Science	WOS:001078492700008
Referencia del Financiador (Mandatado si es aplicable-repetible)	UFRO FRO1999 ANID 1200942 Natural Sciences and Engineering Research Council of Canada RGPIN2020-04983
Título de la cita (Recomendado-único)	Impact of cooling rate and shear flow on crystallization and mechanical properties of wax-crystal networks
Identificador del recurso (Mandatado-único)	artículo original
Versión del recurso (Recomendado-único)	versión publicada
Editorial	AIP Publishing
Revista/Libro	PHYSICS OF FLUIDS
Categoría WOS	Mecánica Física, Fluidos y Plasmas
Idioma	en
ISSN	1089-7666
Derechos de acceso	metadata
Access Rights	metadata