Unraveling driving regimes for destabilizing concentrated emulsions within microchannels

Autor(es)

Porto Santos, Tatiana ^{[1, 2]} ; Cejas, Cesare M. ^[2] ; Cunha, Rosiane Lopes ^[1] ; Tabeling, Patrick ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Food Engn, Fac Food Engn, Rua Monteiro Lobato, 80, BR-13083862 Campinas - Brazil

^[2] PSL Res Univ, Inst Pierre Gilles Gennes IPGG, Nanostruct Lab, ESPCI Paris, Microfluid, MEMS, CNRS, Chim Biol Innovat CBI UMR 82, 6 Rue Jean Calvin, F-75005 Paris - France

• Tipo de documento: Artigo Científico
• Fonte: SOFT MATTER; v. 17, n. 7, p. 1821-1833, FEB 21 2021.
• Citações Web of Science: 0

Resumo

Coalescence is the most widely demonstrated mechanism for destabilizing emulsion droplets in microfluidic chambers. However, we find that depending on the channel wall surface functionalization, surface zeta potential, type of surfactant, characteristics of the oil as a dispersed phase, or even the presence of externally-induced stress, other different destabilization mechanisms can occur in subtle ways. In general, we observe four regimes leading to destabilization of concentrated emulsions: (i) coalescence, (ii) emulsion bursts, (iii) a combination of the two first mechanisms, attributed to the simultaneous occurrence of coalescence and emulsion bursts; and (iv) compaction of the droplet network that eventually destabilizes to fracture-like behavior. We correlate various physico-chemical properties (zeta potential, contact angle, interfacial tension) to understand their respective influence on the destabilization mechanisms. This work provides insights into possible ways to control or inflict emulsion droplet destabilization for different applications. (AU)

• Processo FAPESP: 19/07744-1 - Utilização de dispositivos microfluídicos para avaliação de estabilidade de emulsões
• Beneficiário: Rosiane Lopes da Cunha
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/18109-0 - Desenvolvimento de um analisador de estabilidade de emulsões utilizando microfluídica
• Beneficiário: Tatiana Porto dos Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/18103-4 - Estudo sistemático da coalescência em emulsões óleo-em-água e água-em-óleo em dispositivos microfluídicos
• Beneficiário: Tatiana Porto dos Santos
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado