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# Hyunjung Kim <hkim@sogang.ac.kr>
# requesting 7 days, at minimum= days
# beamline 34ID-C, Coherent X-ray Diffraction Studies of Zeolite microcrystals
# instrument 34ID-C coherent
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# top:/home/www/beamtime-requests/req01119.txt
# UNICAT Member Beam Time Request  #1119
# created Tue Jan 02 10:41:46 CST 2007
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apsrun:
	2007-01

beamline:
	34ID-C

collaboration:
	No

contact:
	hkim@sogang.ac.kr

days:
	7

description:
	It has drawn continuous attention to organize microcrystals in the form of uniformly aligned and closely packed layers on substrates for potential applications of bio- and materials science. Some successful methods have been demonstrated for organizing microcrystals with closely packed mono- and multilayers on glass and other substrates through various well-defined covalent and ionic linkages, using zeolite crystals as model microcrystals. Zeolites are a class of crystalline aluminosilicate minerals having uniform and regularly spaced nanopores. These crystals have potential applications as nuclear waste scavengers and are useful as quantum confinement hosts for semiconductor materials. There have been a lot of efforts made in the synthesis of new zeolite crystals and related molecular sieves during the last several decades. Recently there have been successful synthetic methods invented for the production of CdS quantum dots chemically incorporated in pores of zeolite crystals by one of us. However, there are no direct ways yet to measure how well CdS quantum dots incorporated into the pores and whether lattice strain due to confinement effect appears. Unfortunately it is not easy to measure by TEM since zeolite crystals are very easily damaged by electrons. Coherent X-ray diffraction (CXD) is an emerging technique to obtain three-dimensional images of internal density distribution within even nanosized crystals. When the object is illuminated by coherent x-rays, the oversampled diffraction pattern can be inverted to give real space images of the sample. CXD is a strong analytic method for nondestructive measurement of internal structures of materials. In this study, we are planning to measure CXD on zeolite microcrystals and those having CdS quantum dots in order to get information on internal density distribution and finally to map deformation field inside nanostructures like CdS quantum dots.

equipment_required:
	

experiment:
	Coherent X-ray Diffraction Studies of Zeolite microcrystals

foreign_nationals:
	Hyunjung Kim, Youngsuk Byun

hazards:
	

instrument:
	34ID-C coherent

instrument_other:
	

minimumdays:
	

name:
	Hyunjung Kim

nonmembers:
	

submit:
	Submit

unacceptable_dates:
	Note : If it is possible, we prefer to have (1) Feb. 28-March. 6 or (2) Mar. 7-Mar.12. Since we are flying from Korea and planning to attend March meeting, it will be convenient for us if you can give us one of the above. Otherwise, please give us sometime in February.

z34ID_details:
	


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