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This content will become publicly available on April 16, 2019

Title: Liquid interfaces with pH-switchable nanoparticle arrays

Stimuli-responsive 2D nanoscale systems offer intriguing opportunities for creating switchable interfaces. At liquid interfaces, such systems can provide control over interfacial energies, surface structure, and rheological and transport characteristics, which is relevant, for example, to bio- and chemical reactors, microfluidic devices, and soft robotics. We explore the formation of a pH-responsive membrane formed from gold nanoparticles grafted with DNA (DNA–NPs) at a liquid–vapor interface. A DNA–NP 2D hexagonal lattice can be reversibly switched by pH modulation between an expanded state of non-connected nanoparticles at neutral pH and a contracted state of linked nanoparticles at acidic pH due to the AH +–H +A base pairing between A-motifs. Our in situ surface X-ray scattering studies reveal that the reversible lattice contraction can be tuned by the length of pH-activated linkers, with up to ~71% change in surface area.
ORCiD logo [1] ;  [2] ; ORCiD logo [3]
  1. Indian Inst. of Technology Bombay, Mumbai (India). Dept. of Physics; Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept. and National Synchrotron Light Source II (NSLS-II)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN); Columbia Univ., New York, NY (United States). Dept. of Chemical Engineering and Dept. of Applied Physics and Applied Mathematics
Publication Date:
Report Number(s):
Journal ID: ISSN 1744-683X; SMOABF
Grant/Contract Number:
SC0012704; AC02-98CH10886; SC0008772
Accepted Manuscript
Journal Name:
Soft Matter
Additional Journal Information:
Journal Volume: 14; Journal Issue: 19; Journal ID: ISSN 1744-683X
Royal Society of Chemistry
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY; 59 BASIC BIOLOGICAL SCIENCES; Self-assembly; Responsive nanostructures; Liquid interfaces; DNA; Nanoparticles
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1436356