Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 558, Issue -, Pages 95-99Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.09.084
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Funding
- National Science Foundation [CBET-1934513, CBET-1067501]
- PSC CUNY [ENHC-49-82]
- office of the Vice President for Research at the University of Oklahoma
- Provost's office at the University of Oklahoma
- School of Engineering Research Center at Universidad de los Andes
- Chemical Engineering Department at Universidad de los Andes
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The behavior of Janus particles fabricated from core silica particles decorated with gold nanoparticles on one hemisphere is studied at the air/water interface. An unexpected reduction in the effective surface tension is observed in the presence of these chemically-modified Janus particles. Experiments on the interfacial behavior of a variety of control particles, including the physically-modified Janus particles made from the same core silica particles coated with a thin gold layer, do not exhibit significant surface tension effects. We hypothesize that the chemical modification of particles in form of a Janus structure is needed to alter the surface tension and attribute the surfactant-like behavior of these particles to the presence of immersion forces. (C) 2019 Elsevier Inc. All rights reserved.
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