Real-time X-ray powder diffraction investigations on cocoa butter. III. Direct β-crystallization of cocoa butter: Occurrence of a memory effect

1996 ◽  
Vol 73 (10) ◽  
pp. 1225-1230 ◽  
Author(s):  
Kees van Malssen ◽  
René Peschar ◽  
Claudia Brito ◽  
Henk Schenk
Keyword(s):  
Cocoa Butter ◽  
Real Time ◽  
Memory Effect ◽  
Powder Diffraction ◽  
X Ray

scholarly journals Real-time X-ray powder diffraction experiments on cocoa butter

1996 ◽  
Vol 52 (a1) ◽  
pp. C399-C399
Author(s):  
H. Schenk ◽  
K. F. van Malssen ◽  
R. Peschar
Keyword(s):  
Cocoa Butter ◽  
Real Time ◽  
Powder Diffraction ◽  
X Ray

Phase behavior and extended phase scheme of static cocoa butter investigated with real-time X-ray powder diffraction

1999 ◽  
Vol 76 (6) ◽  
pp. 669-676 ◽  
Author(s):  
Kees van Malssen ◽  
Arjen van Langevelde ◽  
René Peschar ◽  
Henk Schenk
Keyword(s):  
Cocoa Butter ◽  
Phase Behavior ◽  
Real Time ◽  
Powder Diffraction ◽  
Extended Phase ◽  
X Ray

scholarly journals Mechanisms of mechanochemical salt formation by in situ real time X-ray powder diffraction

2016 ◽  
Vol 72 (a1) ◽  
pp. s394-s394
Author(s):  
Adam A. L. Michalchuk ◽  
Ivan A. Tumanov ◽  
Simon A. J. Kimber ◽  
Elena V. Boldyreva ◽  
Colin R. Pulham
Keyword(s):  
Real Time ◽  
Powder Diffraction ◽  
Salt Formation ◽  
X Ray

scholarly journals Real time study of wet-chemical reaction dynamics at beamline P02.1 @ PETRA III

2014 ◽  
Vol 70 (a1) ◽  
pp. C858-C858
Author(s):  
Ann-Christin Dippel ◽  
Jan Torben Delitz ◽  
Hanns-Peter Liermann ◽  
Christoffer Tyrsted ◽  
Dipankar Saha ◽  
...  
Keyword(s):  
High Resolution ◽  
Real Time ◽  
Powder Diffraction ◽  
Structural Changes ◽  
Reciprocal Space ◽  
Atomic Scale ◽  
Polycrystalline Materials ◽  
Total Scattering ◽  
X Ray ◽  
Wet Chemical

The high brilliance synchrotron light source PETRA III in Hamburg, Germany, provides a dedicated X-ray powder diffraction beamline called P02.1 [1]. It is a side station to the hard X-ray diffraction beamline and runs at a fixed photon energy of 60 keV. Its dispersive monochromator produces a highly collimated photon beam of very narrow energy bandwidth and high intensity. These excellent beam characteristics turn P02.1 into an ideal instrument for many different kinds of experiments, ranging from high resolution powder diffraction of polycrystalline materials for structure solution and refinement or microstructure analysis, to the study of nanocrystalline and disordered materials to determine their local structure. In particular, it is the scope of P02.1 to study dynamic processes such as chemical and crystallographic transitions under non-ambient conditions in real time. For this purpose, the beamline is equipped with a large and fast area detector which enables sub-second time-resolution. The accessible range in reciprocal space is beyond Q = 30 Å-1. Hence, P02.1 is a powerful tool for total scattering experiments as it provides high resolution in real and reciprocal space which are determined by the max. Q and the instrumental resolution, respectively. This presentation describes some recent experiments carried out at P02.1 that relate to pair distribution function (PDF) and total scattering analysis. The focus will be on the investigation of structural changes on the atomic scale during the wet-chemical synthesis of nanoparticles, e.g. in the system ZrO2. By means of evaluating the changes of bond distances and atomic coordination on a time scale of seconds, it is possible to describe the molecular structure of intermediates and, thus, to deduce the underlying reaction mechanism. On the basis of this information, synthesis processes may be optimised with respect to tuning the properties of the product and to maximize its yield.

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