Phosphorus Research Bulletin
Online ISSN : 1882-2363
Print ISSN : 0918-4783
ISSN-L : 0918-4783
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Volume 21
Displaying 1-19 of 19 articles from this issue
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  • Preface to Phosphorus Research Bulletin, Vo1ume 21
    Tsugio Sato
    2007 Volume 21 Pages i-ii
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.i
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  • APPROACH USING APATITE TO STUDIES ON ENERGY AND ENVIRONMENT
    Shigeru Sugiyama
    2007 Volume 21 Pages 1-8
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.1
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    New findings obtained in our laboratory from the employment of various hydroxyapatites as heterogeneous catalysts and immobilization reagents of aqueous heavy metal cations are reviewed in the present article. Catalytic active cite on hydroxyapatite for the oxidation of alkanes and the possibility of the recycle-use of calcium hydroxyapatite for the removal-regeneration of aqueous heavy metal cations are suggested.
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  • EFFECTS OF IONIC SURFACTANTS ON THE ADSORPTION OF BOVINE SERUM ALBUMIN TO THE SURFACE OF HYDROXYAPATITE
    Emiko Motoki, Satoru Ueno, Saburo Shimabayashi
    2007 Volume 21 Pages 9-15
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.9
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    The effects of ionic surfactants, dodecyltrimethylammonium chloride (DTMAC) and sodium dodecyl sulfate (SDS), on the adsorption amount of bovine serum albumin (BSA) onto the surface of hydroxyapatite (HAP) were studied. BSA was bound to HAP owing mainly to electrostatic interaction between opposite charges on HAP and BSA in the absence of an additive. The adsorption amount of BSA on HAP increased with a concentration of added DTMAC by virtue of hydrophobic interaction between hydrocarbon chains of DTMAC bound to BSA and those adsorbed on HAP in the range of a low concentration of DTMAC. The adsorption amount, however, decreased with the concentration in the region of a higher concentration of DTMAC. This is because the expansion/denaturation of BSA was caused after the binding of much amount of DTMAC, resulting in an increase in a molecular occupation area of BSA on the HAP surface. On the other hand, in the presence of SDS, the adsorption amount of BSA on HAP monotonously decreased with a concentration of SDS owing to the strong effect of SDS on the expansion and concomitant denaturation of BSA.
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  • PREPARATION OF ALUMINUM POLYPHOSPHATE AND IMPROVEMENT ON ITS PHYSICOCHEMICAL PROPERTIES BY MECHANOCHEMICAL TREATMENT
    Hiroaki Onoda, Masakazu Kohno, Kazuo Kojima
    2007 Volume 21 Pages 16-19
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.16
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    Aluminum polyphosphate was prepared and then treated with the planetary mill for several minutes. The milled samples were characterized by inductively coupled plasma, X-ray diffraction, and Fourier transform infrared spectroscopy. SEM images, particle size distribution, specific surface area, surface acid strength, and amount of acidic sites of the materials were also measured. Furthermore, the catalytic and adsorptive properties of aluminum phosphate were also estimated.
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  • INHIBITION OF AMORPHOUS CALCIUM PHOSPHATE TRANFORMATION TO HYDROXYAPATITE BY POLYMERS: IMPACT OF HEAT TREATMENT ON POLYMERS PERFORMANCE
    Zahid Amjad
    2007 Volume 21 Pages 20-24
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.20
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    The impact of thermal stability on the performance of homo-polymers of acrylic acid, methacrylic acid, maleic acid, 2-acrylamido-2-methylpropanesulfonic, and co-polymer of acrylic acid : 2-acrylamido-2-methtylpropane sulfonic acid as inhibitors for the transformation of amorphous calcium phosphate to hydroxyapatite at pH 7.40, 37°C, calcium = phosphate = 3.200 mM was investigated. It has been found that all polymers lose performance to a varying degree when exposed to thermal treatment (150°C, 200°C, 240°C, 20 hr). The performance data also suggest that carboxylic acid containing homo-polymers are better inhibitors than sulfonic acid containing homo-polymer and co-polymer. The results have been explained in terms of loss of carboxylic acid group and degradation of amido group to carboxylic acid group.
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  • ADSORPTION PROPERTIES OF ACIDIC AND BASIC PROTEINS ON THE SURFACE OF CARBONATE-CONTAINING HYDROXYAPATITE
    Toru Kanno, Toru Sendai, Kiyoshi Tada, Jun-ichi Horiuchi, Toshiyuki Ak ...
    2007 Volume 21 Pages 25-30
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.25
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    Carbonate-containing hydroxyapatites (HAp’s) were prepared at 6.0, 7.0, 8.5, or 10.5 of pH, and the content of carbonate increased as the increase of pH: 0.9 - 6.3 mass%-CO3/g-HAp. Increase of the content made the crystallite size of (001) face smaller by 40 %. IR spectra showed that the increase of carbonate content led to an increase of OH-substituted carbonate species compared to PO4-substitued one. The adsorption properties of two kinds of proteins: acidic bovine serum albumin (BSA) and basic egg white lysozyme (LSZ) were investigated at 295 K on the HAp’s of different contents of carbonate. All the adsorption isotherms followed the Langmuir-type adsorption. The saturated-adsorbed amount of BSA decreased with the increase of the content of carbonate. Two reasons were proposed for the decrease of the amount. Firstly, retard of HAp crystal growth along the c-axis gave rise to relatively less amount of the C-site on a-and b-faces: less amount of adsorption site for BSA. Secondly, increase of the OH-substituted carbonate may cause less amount of OH vacancy and to inhibit the carboxyl ion of BSA on the C-site. LSZ, which is considered to be adsorbed on the P site on c-face, had little dependency of the content, suggesting that neither crystallographic change nor composition of two kinds of carbonate species had an effect on LSZ adsorption.
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  • PROTON CONDUCTING SOLID ELECTROLYTES BASED ON DIPHOSPHATES
    Takaaki Shirai, Shunsuke Satou, Yasukazu Saito, Morihiro Saito, Jun Ku ...
    2007 Volume 21 Pages 31-37
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.31
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    The highly densified A0.9In0.1P2O7(A=Sn,Ti) sinters prepared through a solid-state reaction route showed an extremely low ionic conductivity of <10-7 Scm-1 at 400°C. This indicates that both are nearly insulating materials. The H3PO4-modified A0.9In0.1P2.4O7(A=Sn,Ti) were synthesized by planetary-ball milling with 85 mass% H3PO4. The H3PO4-modified Ti0.9In0.1P2.4O7 sample showed the highest proton conductivity to date of 2.0×10-1 Scm-1 (161°C), which was higher than that reported by Nagao et al. The sol-gel derived A0.9M0.1P2.4O7(A=Sn,Ti; M=In,Al,Fe) showed high proton conductivities of 7×10-2 Scm-1 -10-4 Scm-1 (100-250°C). The conduction mechanism based on a core-shell structure is presented. The conductivities were significantly influenced by heat-treatments in preparation processes and increased with increasing amounts of the amorphous phase, the M-containing impurity and the phosphorus oxide content, which formed the conductive shells. The conductivity results reported to date on the diphosphate-related electrolytes are well explained by the mechanism based on the shell-core structure.
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  • PHOSPHORYLATION OF D-GLUCOSE AND GLUCO-OLIGOSACCHARIDES WITH DIIMIDO-CYCLO-TRIPHOSPHATE
    Hideko Maeda, Hirokazu Nakayama, Hiroyuki Nariai, Mitsutomo Tsuhako
    2007 Volume 21 Pages 38-43
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.38
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    Phosphorylation of D-glucose has been achieved using inorganic diimido-cyclo-triphosphate in aqueous solution. In the phosphorylation of D-glucose and maltose, 1-O-diimidotriphospho-β-D-glucose and 1-O-diimidotriphospho-β-maltose were stereoselectively synthesized with yields of 35 and 30 %, respectively. For α-cyclodextrin, γ-cyclodextrin, and mono-6-O-α-maltosyl-β-cyclodextrin, two phosphorylated products were obtained in each cyclodextrin and main products were mono-2-O-diimidotriphosphoryl esters of cyclodextrin.
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  • SYNTHESIS AND PHOTOCHEMICAL PROPERTIES OF MICACEOUS CERIUM PHOSPHATES
    Tsugio Sato, Ruixing Li, Chigusa Sato, Shu Yin
    2007 Volume 21 Pages 44-47
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.44
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    Micaceous hydrated cerium phosphate, Ce2(PO4)2HPO4•H2O, was prepared by the hydrothermal reaction and its photochemical properties were evaluated. Ce2(PO4)2HPO4•H2O showed excellent absorption ability of light having a wavelength less than 450 nm of wavelength and oxidation catalytic activity lower than undoped ceria. Ce2(PO4)2HPO4•H2O was converted to a plate-like CePO4-CeP2O7 mixture around 650°C and CePO4-CeP3O9 mixture around 800°C, possessing absorption ability of UV light less than 400 nm and much lower oxidation catalytic activity than Ce2(PO4)2HPO4•H2O.
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  • PREPARATION AND REACTIVITY OF CYCLO-HEXAPHOSPHATE COACERVATE
    Katsuyuki Kitano, Hideshi Maki, Hiroyuki Nariai
    2007 Volume 21 Pages 48-52
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.48
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    Coacervate using cyclo-hexaphosphate(P6m) was prepared by addition of Ni(NO3)2•6H2O and acetone to cyclo-hexaphosphoric acid solution and investigated for the formation conditions and reactivity. Organic solvents affected the composition of P6m coacervate and a large quantity of organic solvent made P6m more concentrated state. Heptaphosphate(P7) and octaphosphate(P8) having higher degrees of polymerization than P6m were produced in P6m coacervate. P7 and P8 were produced by the reaction of P6m with orthophosphate(P1) and that of P6m with diphosphate(P2), respectively.
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  • INFLUENCE OF UREA ADDITION ON PREPARATION AND ACIDIC PROPERTIES OF AMORPHOUS LANTHANUM PYROPHOSPHATE
    Hiroaki Onoda, Yuya Ishima, Hirokazu Nakayama, Isao Tanaka
    2007 Volume 21 Pages 53-59
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.53
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    The addition of urea was studied as one of the preparation methods for porous phosphate particles. Urea was added to the preparation of lanthanum pyrophosphate from lanthanum nitrate and sodium pyrophosphate solutions. The precipitations prepared in various concentration of urea and their thermal products were estimated about the chemical composition, powder and acidic properties. The addition of urea on preparation of lanthanum pyrophosphate produced the increase of about 10-20 nm-radius pores. The large amount of urea covered the pore of lanthanum pyrophosphate. The amount of included urea in lanthanum phosphate was estimated from NH3-TPD curves. The addition of urea did not improve the adsorption ratio of trimethylamine because of the balance between the remained urea and improvement of specific surface area.
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  • CHEMICAL PREPARATION, THERMAL BEHAVIOR, KINETIC AND INFRARED STUDIES AND QUANTUM CHEMICAL CALCULATIONS OF Ca3(P3O9)2•10H2O
    Said Belaaouad, Malika Tridane, Hind Chennak, Rachid Tamani, Abdelkebi ...
    2007 Volume 21 Pages 60-70
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.60
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    Chemical preparation, thermal behavior, kinetic and IR studies are given for the cyclotriphosphate Ca3(P3O9)2•10H2O. Ca3(P3O9)2•10H2O is monoclinic P21/n with the following unit-cell dimensions: a = 9.332(7)Å, b = 18.13(1)Å, c = 7.841(5), β = 106.69(5)° and Z = 2. Ca3(P3O9)2•10H2O has never been studied except for its crystallographic characterization. The thermal behavior of Ca3(P3O9)2.10H2O has been studied and interpreted by comparison with IR absorption spectrometry, X-ray diffraction experiments, chemical analyses, thermal analyses (TGA-DTA) and differential scanning calorimetry (DSC). Ca3(P3O9)2•10H2O is stable, in the conditions of temperature and pressure of our laboratory, until 80°C. It is impossible to dehydrate Ca3(P3O9)2•10H2O without breaking its rings P3O93- and leading to amorphous compounds in X-ray diffraction and IR absorption spectrometry. The final product of the dehydration and calcination of Ca3(P3O9)2•10H2O, under atmospheric pressure is its long chain polyphosphate form β, β[Ca(PO3)2]8. β[Ca(PO3)2]8 is stable until its melting point at 1097°C. On the other hand, β[Ca(PO3)2]8is prepared by dry way. β[Ca(PO3)2]8 has many applications in industry such as humidity sensor and corrosion inhibitor. Also, quantum chemical calculations have been performed for the P3O9 rings.
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  • EFFECTS OF PHOSPHATE IONS ON THE POLYPEPTIDE - LIPOSOME MENBRANE INTERACTION
    Satoru Ueno, Yasuko Yoshioka, Saburo Shimabayashi
    2007 Volume 21 Pages 71-77
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.71
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    We find that positively charged polypeptide: poly-L-arginine (poly(Arg)) can translocate through the negatively charged liposome membranes in Tris-HCl buffer but cannot translocate in phosphate buffer. We also investigated the translocation ability of positively charged poly(Arg) through a mechanism involving poly(Arg) - lipid interactions in a model lipid membrane system under various buffer conditions. It was concluded that the secondary structure of poly(Arg) had the dominant effect on its transportability through the membrane.
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  • RARE EARTH PHOSPHATES AS HUMIDITY SENSORS
    Adly A. Hanna, Sahar M. Mousa Ashraf, F. Ali, Marwa A. El-Sayed
    2007 Volume 21 Pages 78-83
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.78
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    The aim of this work is preparation, characterization, and evaluation of some rare earth phosphates REPO4 (RE= La, Sm, Gd) to be used as humidity sensors. Their substitution with Na+ or Ca2+ were prepared by both wet and dry methods. The produced samples were characterized by using the classical methods. The X-ray data shows that different compounds and different phases were formed depending on the method of preparation and the control conditions. The electrical conductivity of the samples were measured at 25-300°C and different relative humidity ranges of 30 to 92%. The dependence of electrical conductivity on temperature indicates that, the rare earth phosphates behave as semiconductor materials whatever they prepared by wet or dry method. It is found that the electrical conductivity of most phosphate samples increase smoothly as the relative humidity increase. This behavior may due to the protonic conduction at low humidity values and to the protonic and electrolytic conductions at high humidities. From the analysis of the obtained results, it may conclude that, the humidity sensors with high sensitivity and thermal stability could be developed from some rare earth phosphates.
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  • HYDROTHERMAL SYNTHESIS AND PARTICLE SIZE CONTROL OF HYDROXYAPATITE SOLID SOLUTIONS WITH VANADATE
    Shuhei Ogo, Ayumu Onda, Koji Kajiyoshi, Kazumichi Yanagisawa
    2007 Volume 21 Pages 84-87
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.84
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    The purpose of this paper is to report on hydrothermal synthesis of hydroxyapatite solid solutions with vanadate, Ca10(PO4)6-x(VO4)x(OH)2. We investigated effects of NaOH concentration (0.4-1.2 M) and reaction temperature (30-225°C) on the formation of Ca10(PO4)2(VO4)4(OH)2 powder. The prepared powders were characterized using elemental analysis, X-ray diffraction, and TEM observation. The white Ca10(PO4)2(VO4)4(OH)2 powders were hydrothermally synthesized using aqueous solutions of NaOH concentration more than 0.9 M. The particle size increased from 16.4 nm (30°C) to 71.1 nm (225°C) with increasing the reaction temperature without changing the crystal structure and morphology.
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  • ION-EXCHANGE STUDY OF THE COMPLEX FORMATION OF SOME CONDENSED PHOSPHATE OLIGOMERS WITH Al3+ AND Cu2+ ION
    Genichiro Kura
    2007 Volume 21 Pages 88-94
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.88
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    In this paper, the complex formations of cyclo-polyphosphates and linear polyphosphates with copper(II), and aluminum ions were investigated by both cation- and anion-exchange methods. From the apparent stability constants of cyclo-polyphosphate complexes, it was shown that their complex formations with both cations are due to electrostatic forces. On the other hand, the complex formations between linear polyphosphates and cations might be ascribed to the covalent bond.
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  • CRYSTALLIZATION OF SODIUM cyclo-TRI- AND -TETRAPHOSPHATES
    Genichiro Kura, Yuko Chiwata
    2007 Volume 21 Pages 95-96
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.95
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  • PHOTO-INDUCED CATALYTIC ACTIVITY OF HYDROXYAPATITE BASED ON PHOTO-EXCITATION
    Harumitsu Nishikawa
    2007 Volume 21 Pages 97-102
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.97
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    The photocatalytic activity of hydroxyapatite(HAp) and its activation mechanism were studied. The author demonstrated that the oxidative decomposition of the odor compounds such as methyl mercaptane(MM) and dimethyl sulfide(DMS) occurred under UV(254nm) irradiation when HAp was employed after heat treatment at 200°C. The XPS, FT-IR and ESR characterizations revealed that UV irradiation modified the PO4 groups on the HAp surface, and generated a trapped electron and active O2• – species. These observations strongly suggested that the oxygen vacancy was produced by UV irradiation. The structural water in HAp was believed to promote the formation of the trapped electron. These results indicate that the HAp can be considered a promising material as a photo-induced catalyst in environmental technology.
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  • PHOSPHORYLATION OF SACCHARIDES BY INORGANIC CYCLO-TRIPHOSPHATE IN AQUEOUS SOLUTION
    Hideko Maeda, Hirokazu Nakayama, Mitsutomo Tsuhako
    2007 Volume 21 Pages 103-110
    Published: 2007
    Released on J-STAGE: September 26, 2007
    DOIhttps://doi.org/10.3363/prb.21.103
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