#
# arev:/usr/local/unicat/unireq/beamreq/req00134.txt
# UNICAT Member Beam Time Request  #134

# created Tue Sep 12 14:32:30 CDT 2000
#

collaboration:
	Yes

contact:
	ikr@uiuc.edu

days:
	6

description:
	Our previous run in June produced dramatic coherent diffraction (CXD)
	patterns of Au nanocrystals, prepared by long-term heating of 1000A
	thick blanket films on an inert substrate.
	
	We have developed an in-situ heater stage based on a projection lamp
	shining on a mm-sized sample.  This will allow us to equilibrate the
	samples at temperatures up to 1000C.  We intend to measure the time-
	dependence of the equilibrium crystal shape (ECS), which can be
	obtained by inversion of the CXD pattern, at these high temperatures.
	Ex-situ experiments suggest the ECS evolves only slowly by surface
	diffusion-type processes.
	
	The CCD detector and diffraction arm we have built for the Huber
	diffractometer will be the same as our previous run.  These could
	be modified to work with the Newport/Microcontrol instrument if 
	needed.

equipment+required:
	Huber or Newport diffractometer
	Oven and microscope in chem lab.

experiment:
	In-situ high-temperature evolution of Au nanocrystals

foreign+nationals:
	Ivan Vartaniants

hazards:
	Oven preheating of samples in laboratory.
	Bright visible light emission from sample heater, requiring use
	of welders' goggles.
	No chemical preparations will be made at ANL.

name:
	Ian Robinson

new+request:
	on

nonmembers:
	

station:
	33ID-D

unacceptable+dates:
	Nov 9-23 (NSLS beamtime)
	Nov 27-Dec 1 (MRS meeting)
	



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