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Title: Mixed Nanosphere Assemblies at a Liquid–Liquid Interface

Journal Article · · Small
 [1];  [2];  [2];  [1];  [3];  [1];  [4];  [4];  [5]; ORCiD logo [6]
  1. Department of Polymer Science and Engineering University of Massachusetts Amherst Amherst MA 01003 USA
  2. Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  3. Material Science and Engineering Department King Fahd University of Petroleum and Minerals (KFUPM) Dhahran 31261 Saudi Arabia, Interdisciplinary Research Center for Intelligent Manufacturing and Robotics King Fahd University of Petroleum and Minerals (KFUPM) Dhahran 31261 Saudi Arabia
  4. Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  5. Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA, Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  6. Department of Polymer Science and Engineering University of Massachusetts Amherst Amherst MA 01003 USA, Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA, Advanced Institute for Materials Research (WPI‐AIMR) Tohoku University 2‐1‐1 Katahira, Aoba Sendai 980‐8577 Japan

Abstract The in‐plane packing of gold (Au), polystyrene (PS), and silica (SiO 2 ) spherical nanoparticle (NP) mixtures at a water–oil interface is investigated in situ by UV–vis reflection spectroscopy. All NPs are functionalized with carboxylic acid such that they strongly interact with amine‐functionalized ligands dissolved in an immiscible oil phase at the fluid interface. This interaction markedly increases the binding energy of these nanoparticle surfactants (NPSs). The separation distance between the Au NPSs and Au surface coverage are measured by the maximum plasmonic wavelength (λ max ) and integrated intensities as the assemblies saturate for different concentrations of non‐plasmonic (PS/SiO 2 ) NPs. As the PS/SiO 2 content increases, the time to reach intimate Au NP contact also increases, resulting from their hindered mobility. λ max changes within the first few minutes of adsorption due to weak attractive inter‐NP forces. Additionally, a sharper peak in the reflection spectrum at NP saturation reveals tighter Au NP packing for assemblies with intermediate non‐plasmonic NP content. Grazing incidence small angle X‐ray scattering (GISAXS) and scanning electron microscopy (SEM) measurements confirm a decrease in Au NP domain size for mixtures with larger non‐plasmonic NP content. The results demonstrate a simple means to probe interfacial phase separation behavior using in situ spectroscopy as interfacial structures densify into jammed, phase‐separated NP films.

Sponsoring Organization:
USDOE
OSTI ID:
2217686
Journal Information:
Small, Journal Name: Small; ISSN 1613-6810
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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