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Crystallization Behavior of Glycine Molecules with Electrolytic Dissociation on Charged Silica Gel Particles
Author(s) -
Deki Yuto,
Kadota Kazunori,
Onda Saori,
Tozuka Yuichi,
Shimosaka Atsuko,
Yoshida Mikio,
Shirakawa Yoshiyuki
Publication year - 2018
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201700398
Subject(s) - electrolyte , dissociation (chemistry) , point of zero charge , surface charge , nucleation , crystallization , silica gel , charge density , particle size , chemical engineering , metal , inorganic chemistry , titration , materials science , chemistry , adsorption , chromatography , organic chemistry , physics , electrode , quantum mechanics , engineering
The surface charge of metal oxides in the solution phase may be a driving force for crystallization. Composite particles were prepared using the principle of heterogeneous nucleation on a metal surface with varying charge density. The electrical properties of the silica gel particles in an electrolyte solution were controlled by the pH, and the zero charge point and charge density of the silica gel particles were determined by titration. The morphology of the glycine particles on the silica gel surface depended on the electrical properties of the silica gel particle, resulting in alteration of the glycine polymorph. Powder X‐ray diffraction showed that γ ‐glycine was present at low pH, and α ‐glycine, at high pH. The polymorphism arose from the abundance ratio of the solute ions and the solution structure.