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Faculty of Science

Department of Physics & Astronomy

Dr. Karen Daniells - North Carolina State University

Description

Title: Starbursts and flowers: when spreading droplets break bad 

Speaker: Dr. Karen Daniells 

Institute: North Carolina State University

Location: ABB-102

Description: A droplet of pure water placed on a clean glass surface will spread axisymmetrically: there is nothing to break the symmetry. For more interesting fluids or more interesting surfaces, new patterns of spreading are possible. I will highlight two systems in which dramatic instabilities arise through the interaction of surface tension, elasticity, and the interface between them. The first example -- starburst fractures -- arises when droplets are placed on very soft substrates, such that elastic forces are in direct competition with capillary forces. The second example is the surprising case of a liquid metals, where fingering instabilities are unexpected due to typically large interfacial tensions. However, electrochemical oxidation can lower the interfacial tension of gallium-based liquid metal alloys, thereby inducing drastic shape changes including the formation of fractals. 

Website-https://danielslab.physics.ncsu.edu/

McMaster University - Faculty of Science

Mailing Address

Department of Physics & Astronomy,
McMaster University

ABB-241
1280 Main Street West
Hamilton, Ontario, Canada
L8S 4M1

Contact Information

Telephone Inquiries:
+1 (905) 525-9140 ext.24559
Fax:
(905) 546-1252
Email Inquiries:
physics@mcmaster.ca

McMaster University - Faculty of Science

Mailing Address

Department of Physics & Astronomy,
McMaster University

ABB-241
1280 Main Street West
Hamilton, Ontario, Canada
L8S 4M1

Contact Information

Telephone Inquiries:
+1 (905) 525-9140 ext.24558
Fax:
(905) 546-1252
Email Inquiries:
physics@mcmaster.ca