Journal article

Effect of Orientation and Wetting Properties on the Behavior of Janus Particles at the Air-Water Interface.

Ellen M Knapp, Raymond R Dagastine, Raymond S Tu, Ilona Kretzschmar

ACS Applied Materials and Interfaces | American Chemical Society | Published : 2020

Abstract

The adhesion force and contact angle of gold-capped silica Janus particles and plain silica particles at an air-water interface are studied via colloidal atomic force microscopy. Particles are attached to cantilevers at various orientations, and wetting properties of the gold surface are varied through modification with dodecanethiol. Thiol modification increases the hydrophobicity of the gold surface, thereby increasing the difference between the contact angles of the gold hemisphere and the silica hemisphere and, thus, increasing the degree of amphiphilicity of the Janus particle. Subsequently, the colloidal probe is pushed into a stationary bubble from the water phase followed by retracti..

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University of Melbourne Researchers

Grants

Awarded by National Science Foundation through the MRSEC program at the University of Chicago


Awarded by Air Force Office of Scientific Research (AFOSR)


Awarded by PSC CUNY award


Funding Acknowledgements

This work was performed in part in the Materials Characterization and Fabrication Platform (MCFP) at the University of Melbourne. This research was in part supported by the National Science Foundation through the MRSEC program at the University of Chicago (DMR-1420709), the Air Force Office of Scientific Research (AFOSR #FA9550-14-1-0263), and PSC CUNY award 61783-00 49. EMK acknowledges the Corning Inc.'s Office of STEM Graduate Student Fellowship program for support.