1. Ptychographic X-rayTomography of Silk FiberHydration.
- Author
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Esmaeili, Morteza, Fløystad, Jostein B., Diaz, Ana, Høydalsvik, Kristin, Guizar-Sicairos, Manuel, Andreasen, Jens W., and Breiby, Dag W.
- Subjects
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TOMOGRAPHY , *SILK , *HYDRATION , *ANISOTROPY , *HUMIDITY , *ELECTRON distribution , *NANOPORES - Abstract
Studying noninvasively the internal nanoporous structureof a singleTussah silk fiber under different humidity conditions, we demonstratefor the first time the feasibility of in-situ ptychographic tomography.The resulting 3D images of the silk fiber interior, obtained at bothdry and humid conditions, yield quantitative information about thespatial density variations in the form of detailed maps of the size,shape, and orientation distributions of the nanopores inside the silkfiber, revealing that the fiber swells anisotropically in humid conditions,with the expansion taking place solely normal to the fiber axis. Exploitingquantitative information on the fiber’s electron density, hydrationwas found to proceed through interaction with the silk protein ratherthan filling of pores. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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