Polarized X-ray scattering measures molecular orientation in polymer-grafted nanoparticles

Mukherjee, Subhrangsu; Streit, Jason K.; Gann, Eliot; Saurabh, Kumar; Sunday, Daniel F.; Krishnamurthy, Adarsh; Ganapathysubramanian, Baskar; Richter, Lee J.; Vaia, Richard A.; DeLongchamp, Dean M.

doi:10.1038/s41467-021-25176-4

Title: Polarized X-ray scattering measures molecular orientation in polymer-grafted nanoparticles

Journal Article · 11 August 2021 · Nature Communications

DOI: https://doi.org/10.1038/s41467-021-25176-4 · OSTI ID:1903855

^[1]; Streit, Jason K. ^[2]; Gann, Eliot ^[3]; Saurabh, Kumar ^[4];

^[3];

^[4]; Ganapathysubramanian, Baskar ^[4]; Richter, Lee J. ^[3];

^[5];

^[3]

National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States); OSTI
Air Force Research Laboratory (AFRL), Wright-Patterson AFB, OH (United States); UES, Inc., Dayton, OH (United States)
National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States)
Iowa State University, Ames, IA (United States)
Air Force Research Laboratory (AFRL), Wright-Patterson AFB, OH (United States)

Polymer chains are attached to nanoparticle surfaces for many purposes, including altering solubility, influencing aggregation, dispersion, and even tailoring immune responses in drug delivery. The most unique structural motif of polymer-grafted nanoparticles (PGNs) is the high-density region in the corona where polymer chains are stretched under significant confinement, but orientation of these chains has never been measured because conventional nanoscale-resolved measurements lack sensitivity to polymer orientation in amorphous regions. Here, we directly measure local chain orientation in polystyrene grafted gold nanoparticles using polarized resonant soft X-ray scattering (P-RSoXS). Using a computational scattering pattern simulation approach, we measure the thickness of the anisotropic region of the corona and extent of chain orientation within it. These results demonstrate the power of P-RSoXS to discover and quantify orientational aspects of structure in amorphous soft materials and provide a framework for applying this emerging technique to more complex, chemically heterogeneous systems in the future.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1903855

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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