Fine-Tuning Nanoparticle Packing at Water–Oil Interfaces Using Ionic Strength

Chai, Yu; Lukito, Alysia; Jiang, Yufeng; Ashby, Paul D.; Russell, Thomas P.

doi:10.1021/acs.nanolett.7b03462

Title: Fine-Tuning Nanoparticle Packing at Water–Oil Interfaces Using Ionic Strength

Journal Article · Wed Sep 13 00:00:00 EDT 2017 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.7b03462· OSTI ID:1421824

Chai, Yu ^[1]; Lukito, Alysia ^[2]; Jiang, Yufeng ^[2]; Ashby, Paul D. ^[3];

^[4]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Massachusetts, Amherst, MA (United States); Beijing Univ. of Chemical Technology, Beijing (China)

Nanoparticle-surfactants (NPSs) assembled at water-oil interfaces can significantly lower the interfacial tension and can be used to stabilize liquids. Knowing the formation and assembly and actively tuning the packing of these NPSs is of significant fundamental interest for the interfacial behavior of nanoparticles and of interest for water purification, drug encapsulation, enhanced oil recovery, and innovative energy transduction applications. Here, we demonstrate by means of interfacial tension measurements the high ionic strength helps the adsorption of NPSs to the water-oil interface leading to a denser packing of NPSs at the interface. With the reduction of interfacial area, the phase transitions from a "gas"-like to "liquid" to "solid" states of NPSs in two dimensions are observed. Lastly, we provide the first in situ real-space imaging of NPSs at the water-oil interface by atomic force microcopy.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 1421824

Journal Information:: Nano Letters, Vol. 17, Issue 10; ISSN 1530-6984

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

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