Document Detail


Effects of amino acids on the formation of hematite particles in a forced hydrolysis reaction.
MedLine Citation:
PMID:  16054636     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The influence of amino acids on the formation of hematite particles from a forced hydrolysis reaction of acidic FeCl3 solution was examined. The spherical particles were produced on the systems with L-phenylalanine (L-Phe), L-serine (L-Ser) and L-alanine (L-Ala), though L-glutamine (L-Gln) and L-glutamic acid (L-Glu) gave ellipsoidal hematite particles. This morphological change in hematite particles is consistent with the order of stability constant of amino acids against to Fe3+ ions (K). The hematite particles produced with L-Glu, L-Gln and L-Ser were highly porous because they are formed by aggregation of cluster particles. These particles exhibited microporous behavior by outgassing the particles below 200 degrees C while they changed to mesoporous after treating above 300 degrees C by elimination of amino acids molecules remained between the cluster particles within the hematite particles. The hematite particles strongly depended on the nature of amino acids such as alternation of solution pH and adsorption affinity to beta-FeOOH and/or polynuclear primary (PN) particles. The systems on L-Ala and L-Phe, showing very rapid phase transformation from beta-FeOOH to hematite, exhibited the Ostwald ripening. A rotational particle preparation procedure suggested that the morphology of hematite particle is governed by the mode and strength of amino acid adsorption onto beta-FeOOH and/or PN particles.
Authors:
Kazuhiko Kandori; Masaji Sakai; Shoko Inoue; Tatsuo Ishikawa
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-07-28
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  293     ISSN:  0021-9797     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2005-11-21     Completed Date:  2006-12-01     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  108-15     Citation Subset:  IM    
Affiliation:
School of Chemistry, Osaka University of Education, Asahigaoka 4-698-1, Kashiwara, Osaka 582-8582, Japan. kandori@cc.osaka-kyoiku.ac.jp
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MeSH Terms
Descriptor/Qualifier:
Amino Acids / chemistry*
Ferric Compounds / chemistry*
Hydrogen-Ion Concentration
Hydrolysis
Microscopy, Electron, Transmission
Particle Size
Porosity
Chemical
Reg. No./Substance:
0/Amino Acids; 0/Ferric Compounds; 1309-37-1/ferric oxide

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