Monolayer of amphiphilic functionalized gold nanoparticles at an air-water interface

Raj Kumar Gupta, K. A. Suresh, and Sandeep Kumar
Phys. Rev. E 78, 032601 – Published 18 September 2008

Abstract

Langmuir films at the air-water interface exhibit a variety of surface phases which arise primarily due to the molecular interaction governed by intermolecular separation. We have studied the thermodynamical aspects of Langmuir monolayers of amphiphilic functionalized gold nanoparticles (AGNs) at the air-water (AW) interface. Interestingly, the AGN monolayer exhibits phases like gas, a low-ordered liquid (L1), a high-ordered liquid (L2), and a collapsed state. We find that the first-order phase transition between L1 and L2 vanishes above a critical temperature of 28.4°C. Surprisingly, for a range of higher temperatures (29.4°C and 36.3°C), the L1 phase undergoes a transition to a bilayer of the L2 phase before entering into the collapsed state.

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  • Received 1 July 2008

DOI:https://doi.org/10.1103/PhysRevE.78.032601

©2008 American Physical Society

Authors & Affiliations

Raj Kumar Gupta1,2,*, K. A. Suresh2, and Sandeep Kumar2

  • 1Birla Institute of Technology and Science, Pilani, Physics Group, Rajasthan 333031, India
  • 2Raman Research Institute, Sadashivanagar, Bangalore 560080, India

  • *raj@bits-pilani.ac.in

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Issue

Vol. 78, Iss. 3 — September 2008

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