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Title: Silica Nanoparticle-Induced Structural Reorganizations in Pulmonary Surfactant Films: What Monolayer Compression Isotherms Do Not Say

Journal Article · · ACS Applied Nano Materials

The interaction of nanoparticles (NPs) with pulmonary surfactant is important for understanding the potential adverse effects of inhaled engineered and incidental nanomaterials. The effects of a low concentration (0.001 wt %) of charged, hydrophilic silica NPs of hydrodynamic diameter of ~20 nm on the phase behavior and lateral structure of lipid-only and naturally derived surfactant monolayers were investigated at the air/water interface using surface pressure–area isotherms and Brewster angle microscopy, respectively. Atomic force microscopy was used to image the morphology of films transferred onto mica substrate with nanometer resolution. We show herein that the silica NPs can significantly alter the condensed domain size and shape even in the absence of apparent differences in the monolayer compression isotherms. The cationic particles notably induce structural and morphological progressions in a binary model containing anionic phosphoglycerol that are similar to those observed for the natural surfactant film that contains cationic proteins. These findings specifically highlight the impact of the NP charge on the phase transformations in pulmonary surfactant, with implications for the engineering of nanomaterials for commercial use and bioapplications.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Fonds de recherche du Québec – Nature et technologies (FRQNT); National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
2015-PR-183946; NSF/CHE-1346572; AC02-06CH11357
OSTI ID:
1491887
Journal Information:
ACS Applied Nano Materials, Vol. 1, Issue 9; ISSN 2574-0970
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Figures / Tables (10)