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# Christoph Rau <rau@anl.gov>
# requesting 3 days, at minimum=3 days
# beamline 33BM, "Tomography with micrometer resolution: Study of silicon dioxide micro-spheres"
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# top:/home/www/beamtime-requests/req00437.txt
# UNICAT Member Beam Time Request  #437
# created Fri Aug 15 19:51:12 CDT 2003
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beamline:
	33BM

collaboration:
	Yes

collaborator_Pete:
	ON

contact:
	rau@anl.gov

days:
	3

description:
	Recently a new tomography setup was tested at 33 BM. The functioning of the device was shown as well as the possibility to image weak absorbing materials like silicon dioxide exploiting the partial coherence of the beam. Reconstructed data was obtained from the tomographic scans with a resolution of   2-3 microns. 

The conclusion of the experiment is that scientific applications of tomography can be carried out now with several micrometer resolution.

We are going now to optimize and quantify the performance of the tomography setup. We expect to achieve sub-micrometer resolution with some changes of the detection system.
Further it is planned to make the first scientific applications with the new device. As a starting experiment we want to study the size distribution in silicon dioxide powders. This is a work done in collaboration with Prof. Michael Harris and his graduate student Ms. Treniece Terry at the Purdue University-West Lafayette. The goal of this study is to evaluate the influence of the preparation method on the size distribution of the microspheres in the powder and to examine the feasibility of measuring the thickness of microshells that are formed by electrodispersion precipitation.  In contrast to tedious microtoner/SEM experiments for particle characterization, tomography will provide a powerful and efficient in-situ technique for imaging powders over a wide length scale. As the resolution of the tomography setup improves, tomography will be used to characterize the internal structure of microspheres and microshells of silica or zirconia  that are synthesized by the electrodispersion of preformed colloidal particles that are “glued’ together by the precipitation of soluble sodium silicate or zirconyl chloride.

This experiment fits into a project for hard X-ray tomography with sub-100nm resolution. The detailed description of the entire program is attached to this text (a proposal previously submitted at the ESRF). The final device will consist of a hard X-ray microscope working with a KB-mirror as condenser and a FZP as objective lens, integrated to a tomography setup, which is built up right now.

equipment_required:
	

experiment:
	Tomography with micrometer resolution: Study of silicon dioxide micro-spheres

foreign_nationals:
	

hazards:
	none

minimumdays:
	3

name:
	Christoph Rau

nonmembers:
	Prof. Michael Harris and his graduate student Ms. Treniece Terry at the Purdue University-West Lafayette,
Francesco de Carlo, XOR

unacceptable_dates:
	

z34ID_details:
	


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