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Ordering in bio-inorganic hybrid nanomaterials probed by in situ scanning transmission X-ray microscopy.
Lee, Jonathan R I; Bagge-Hansen, Michael; Tunuguntla, Ramya; Kim, Kyunghoon; Bangar, Mangesh; Willey, Trevor M; Tran, Ich C; Kilcoyne, David A; Noy, Aleksandr; van Buuren, Tony.
Afiliação
  • Lee JR; Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA. vanbuuren1@llnl.gov.
Nanoscale ; 7(21): 9477-86, 2015 Jun 07.
Article em En | MEDLINE | ID: mdl-25874680
ABSTRACT
Phospholipid bilayer coated Si nanowires are one-dimensional (1D) composites that provide versatile bio-nanoelectronic functionality via incorporation of a wide variety of biomolecules into the phospholipid matrix. The physiochemical behaviour of the phospholipid bilayer is strongly dependent on its structure and, as a consequence, substantial modelling and experimental efforts have been directed at the structural characterization of supported bilayers and unsupported phospholipid vesicles; nonetheless, the experimental studies conducted to date have exclusively involved volume-averaged techniques, which do not allow for the assignment of spatially resolved structural variations that could critically impact the performance of the 1D phospholipid-Si NW composites. In this manuscript, we use scanning transmission X-ray microscopy (STXM) to probe bond orientation and bilayer thickness as a function of position with a spatial resolution of ∼30 nm for Δ9-cis 1,2-dioleoyl-sn-glycero-3-phosphocholine layers prepared Si NWs. When coupled with small angle X-ray scattering measurements, the STXM data reveal structural motifs of the Si NWs that give rise to multi-bilayer formation and enable assignment of the orientation of specific bonds known to affect the order and rigidity of phospholipid bilayers.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2015 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2015 Tipo de documento: Article