Quantitative Analysis of Scanning Transmission X-ray Microscopy Images of Gas-Filled PVA-Based Microballoons

Titelangaben

Fernandes, Paulo A. L. ; Tzvetkov, George ; Fink, Rainer H. ; Paradossi, Gaio ; Fery, Andreas:
Quantitative Analysis of Scanning Transmission X-ray Microscopy Images of Gas-Filled PVA-Based Microballoons.
In: Langmuir. Bd. 24 (2008) Heft 23 . - S. 13677-13682.
ISSN 1520-5827
DOI: https://doi.org/10.1021/la801898t

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Abstract

We report on the quantitative analysis of scanning transmission X-ray microscopy (STXM) images of gas-filled, poly(vinyl alcohol) (PVA)-based microballoons (NIB) in a water environment. A model for the transmitted intensity is proposed on the basis of a perfect spherical shell stabilizing the microballoon. An extension of this model to take into account the deformation of the MBs is also presented. Taking into consideration a density gradient of the shell and the STXM resolution, we were able to explain very precisely two types of experimental STXM profiles observed on gas-filled MBs. This enables the detailed characterization of NIB properties such as radius and wall thickness and the determination of their wall density with unprecedented high resolution.