Phosphorus Research Bulletin
Online ISSN : 1882-2363
Print ISSN : 0918-4783
ISSN-L : 0918-4783
Search
Advanced search
OR
Browse
Search
Volume 29
Displaying 1-6 of 6 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • PHOSPHONYLATION OF INOSINE WITH SODIUM DIPHOSPHONATE IN AQUEOUS SOLUTION
    Hideko Maeda, Yukina Atarashi, Chikako Nakayama, Hiromi Nishida, Hiroy ...
    2014 Volume 29 Pages 1-5
    Published: 2014
    Released on J-STAGE: August 19, 2014
    DOIhttps://doi.org/10.3363/prb.29.1
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Phosphonylation of inosine (Ino) has been achieved using inorganic diphosphonate (DP) in aqueous solution. The optimum condition for the phosphonylation of Ino with DP is Ino : DP = 1 : 10, pH 11 and 10 °C. 2´-Phosphonylinosine and 3´-phosphonylinosine were synthesized with the total yield of more than 95 %. The phosphonylated products of Ino were stable at 10 °C and pH 9. The reaction mechanism of Ino with DP was discussed.
    View full abstract
    Download PDF (650K)
  • MECHANICAL TREATMENT ON POWDER PROPERTIES OF TITANIUM PHOSPHATE WHITE PIGMENTS
    Hiroaki Onoda, Syohei Fujikado
    2014 Volume 29 Pages 6-10
    Published: 2014
    Released on J-STAGE: December 14, 2014
    DOIhttps://doi.org/10.3363/prb.29.6
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Titanium dioxide that has the photocatalytic activity is used as white pigment for cosmetics. A certain degree of sebum on the skin is decomposed by the ultraviolet irradiation in sunlight. Recently, as a white pigment, titanium phosphates were prepared from titanium sulfate and phosphoric acid. These titanium phosphates indicated large particles in size for cosmetics. Therefore in this work, the phosphates were treated with ball-mill to obtain small particles. Samples milled for 24 and 72 hours with water had smaller particles than un-milled sample. These titanium phosphates had less photocatalytic activity, therefore, these materials are expected not to decompose the sebum on the skin.
    View full abstract
    Download PDF (577K)
  • ADSORBABILITY AND PHOTO-FENTON REACTIVITY OF AQUATIC HUMIC SUBSTANCES WITH Fe(III)-TREATED HYDROXYAPATITES IN WATER
    Takeshi Moriguchi, Souhei Nakagawa
    2014 Volume 29 Pages 11-20
    Published: 2014
    Released on J-STAGE: December 27, 2014
    DOIhttps://doi.org/10.3363/prb.29.11
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Fe(III)-treated hydroxyapatite, HAP-300-Fe or HAP-400-Fe, which was prepared by treatment of almost stoichiometric hydroxyapatite HAP-300 or Ca-deficient hydroxyapatite HAP-400 with Fe(III) aqueous solution, was investigated in adsorption of aquatic humic substances, Nordic aquatic humic acid (NHA), Nordic aquatic fulvic acid (NFA), and Suwannee river fulvic acid (SFA), at 25°C for 6 h. HAP-400-Fe indicated higher adsorbability than HAP-300-Fe or the raw hydroxyapatite HAP-400. Further, HAP-400-Fe was investigated as a heterogeneous catalyst in photo-Fenton reaction of NHA, NFA, and SFA at 25°C for 20 h in water. Although all the humic substances were subjected to oxidation or decolorization by catalysis of HAP-400-Fe, the humic substance molecules adsorbed on HAP-400-Fe were slightly degraded and mineralized. This is possibly due to steric hindrance of catalysis by those large adsorbed molecules themselves and/or due to a property to scavenge hydroxyl radicals by Ar-OH groups of those molecules.
    View full abstract
    Download PDF (613K)
  • CONTROL OF BETA-TRICALCIUM PHOSPHATE BIOMATERIAL PROPERTIES BY METAL-ION-SUBSTITUTION
    Kazuaki Hashimoto, Naoyuki Matsumoto, Hirobumi Shibata
    2014 Volume 29 Pages 21-30
    Published: 2014
    Released on J-STAGE: March 12, 2015
    DOIhttps://doi.org/10.3363/prb.29.21
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    β-tricalcium phosphate (β-TCP) has a fast rate of bioabsorption, and has been used clinically as bioabsorbant ceramics that is absorbed in vivo and gradually replaced by newly formed bone. Here, we focus on various metal ions with regards to their solid solution substitution in β-TCP, and explain the effects of ion substitution in β-TCP on properties such as structural stability and solubility from a crystal chemistry viewpoint. We also discuss the possibility of metal-ion-subsituted β-TCP materials as hard tissue replacements.
    View full abstract
    Download PDF (1110K)
  • PREPARATION OF PHOTOCATALYTIC THIN FILMS OF TRICALCIUM PHOSPHATE BY DOPING TITANIUM(IV) ION
    Naoya Yoshida, Yuji Nakamura, Toshinori Okura
    2014 Volume 29 Pages 31-35
    Published: 2014
    Released on J-STAGE: April 04, 2015
    DOIhttps://doi.org/10.3363/prb.29.31
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Abstract : Thin films of tricalcium phosphate (TCP) with doping Ti(IV) ion were prepared. These prepared films were characterized by XRD, UV-vis transmission, FT-IT (RAS), and wettability. These characterization indicated that phase separation such as TiO2 did not occur and that substitution with Ti(IV) occurred at Ca site. Photocatalytic activity was evaluated by methylene blue decomposition, and the results suggested that the activity was enhanced by doping Ti(IV).
    View full abstract
    Download PDF (316K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top