Effect of NaOH mercerisation on the crosslinking of ramie fabric using 1, 2, 3, 4-butanetetracarboxylic acid - reaction kinetics

2005 ◽  
Vol 96 (4) ◽  
pp. 213-220 ◽  
Author(s):  
L. M. Zhou ◽  
K. W. Yeung ◽  
C. W. M. Yuen ◽  
X. Zhou
2016 ◽  
Vol 50 (8) ◽  
pp. 898-908 ◽  
Author(s):  
Justyna Krych-Madej ◽  
Katarzyna Stawowska ◽  
Lidia Gebicka

2018 ◽  
Vol 1 ◽  
pp. 100002 ◽  
Author(s):  
Penghui Du ◽  
Wen Liu ◽  
Hongbin Cao ◽  
He Zhao ◽  
Ching-Hua Huang

2017 ◽  
Vol 123 ◽  
pp. 153-161 ◽  
Author(s):  
Kejia Zhang ◽  
Xinyan Zhou ◽  
Penghui Du ◽  
Tuqiao Zhang ◽  
Meiquan Cai ◽  
...  

2010 ◽  
Vol 8 (3) ◽  
pp. 337-341 ◽  
Author(s):  
Elida Purba

X-ray diffraction (XRD) is a powerful technique for the study of polymorphism and polymorphic phase transformations. Monitoring of phase transformation directly has been very limited to-date. The XRD system used in this study was used to determine the rate of transformation of pure glutamic acid a form to b form in a solution mediated phase. On every run starting from the pure a form, the transformation process was monitored continuously at fixed temperature, and separate experiments were performed as a function of temperature. The operating temperature was varied from 36 to 57 °C with 10% w/w solid concentration. Data were taken every 200 seconds until the transformation was completed. This paper is concerned with a study of the transformation of the alpha (a) form of L-glutamic acid (L-GA) to the beta (b) form in order to determine the kinetic reaction. The rate constant (k), activation energy (Ea) and pre-exponential factor (A) were obtained. Sensitivity tests were also carried out to examine minimum detection limit when both a and b present in the mixture. In addition, effect of particle size on XRD patterns was also determined. The results show that XRD gives useful information to observe polymorphism for pharmaceutical industry.     Keywords: XRD, polymorphism, glutamic acid, reaction kinetics


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