Alignment of Au nanorods along de novo designed protein nanofibers studied with automated image analysis

Yaman, Muammer Y.; Guye, Kathryn N.; Ziatdinov, Maxim; Shen, Hao; Baker, David; Kalinin, Sergei V.; Ginger, David S.

doi:10.1039/d1sm00645b

Alignment of Au nanorods along de novo designed protein nanofibers studied with automated image analysis

Journal Article · Fri Jan 01 00:00:00 EST 2021 · Soft Matter

DOI:https://doi.org/10.1039/d1sm00645b· OSTI ID:1821202

^[1]; ^[1]; Ziatdinov, Maxim ^[2]; Shen, Hao ^[3]; Baker, David ^[3]; Kalinin, Sergei V. ^[2]; Ginger, David S. ^[4]

Department of Chemistry; University of Washington; Seattle; USA
Center for Nanophase Materials Sciences; Oak Ridge National Laboratory; Oak Ridge; USA
Department of Biochemistry; University of Washington; Seattle; USA; Institute for Protein Design
Department of Chemistry; University of Washington; Seattle; USA; Physical Sciences Division

In this paper, we focus on exploring the directional assembly of anisotropic Au nanorods along de novo designed 1D protein nanofiber templates. Using machine learning and automated image processing, we analyze scanning electron microscopy (SEM) images to study how the attachment density and alignment fidelity are influenced by variables such as the aspect ratio of the Au nanorods, and the salt concentration of the solution. We find that the Au nanorods prefer to align parallel to the protein nanofibers. This preference decreases with increasing salt concentration, but is only weakly sensitive to the nanorod aspect ratio. While the overall specific Au nanorod attachment density to the protein fibers increases with increasing solution ionic strength, this increase is dominated primarily by non-specific binding to the substrate background, and we find that greater specific attachment (nanorods attached to the nanofiber template as compared to the substrates) occurs at the lower studied salt concentrations, with the maximum ratio of specific to non-specific binding occurring when the protein fiber solutions are prepared in 75 mM NaCl concentration.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)

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

Grant/Contract Number:: AC05-76RL01830; SC0019288

OSTI ID:: 1821202

Alternate ID(s):: OSTI ID: 1821489
OSTI ID: 1788274

Report Number(s):: PNNL-SA--162271

Journal Information:: Soft Matter, Journal Name: Soft Matter Journal Issue: 25 Vol. 17; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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