Mechanochemical Considerations on the Maximal Numbers of Radicals Generated in Binary Powders of Glycolic Acid and Silica-Alumina

The number of radicals generated in a binary powder of glycolic acid and silica-alumina was determined by means of electron spin resonance (ESR) spectroscopy. The maximal number of spins/g and the duration of the maximal number of spins/g were dependent on the calcination temperature of silica-alumi...

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Bibliographic Details
Published inChemical & pharmaceutical bulletin Vol. 37; no. 12; pp. 3181 - 3183
Main Authors KASHIWAGI, Hiroshi, ENOMOTO, Saburo, INOUE, Masami
Format Journal Article
LanguageEnglish
Published Tokyo The Pharmaceutical Society of Japan 1989
Maruzen
Japan Science and Technology Agency
Subjects
binary powder
Chemistry
ESR
Exact sciences and technology
Free radicals chemistry
glycolic acid
maximal spin number duration
mechanical force
mechanochemistry
Organic chemistry
particle size
radical number
Reactivity and mechanisms
silica-alumina
storage condition
Binary mixture
Agitation
Compressive stress
Particle size
Surface reaction
Hydroxyacid
Organic free radical
EPR spectrometry
Alumina
Silica
Powder
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Summary:The number of radicals generated in a binary powder of glycolic acid and silica-alumina was determined by means of electron spin resonance (ESR) spectroscopy. The maximal number of spins/g and the duration of the maximal number of spins/g were dependent on the calcination temperature of silica-alumina, on conditions of storage such as atmosphere or temperature of storage, and on the particle size of silica-alumina. Each of the above values was found to be influenced significantly by mechanical force induced by shaking or compressing. Techniques for decreasing the number of radicals induced by mechanical force are discussed.
ISSN:0009-2363
1347-5223
DOI:10.1248/cpb.37.3181