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). (Received Jan. 16, 2014; Accepted Mar. 5, 2014) INTRODUCTION Previously we have reported preparation of photocatalytic thin film 1 based on a novel apatite Ti-doped calcium hydroxyapatite (TiHAP), 2 which have calcium hydroxyapatite (HAP) structure partially substituted with Ti 4+ ions at calcium sites. This photocatalyst is found to be different from composite systems of TiO2 and an adsorbent (apatite, activated carbon, zeolite, and so on). Yoneyama et al. have revealed that stronger adsorbents lowered the photocatalytic activity of the composite because it prevents migration of adsorbed pollutants on the composite surface. 3 The problem of this composite system is attributable to a distance between photocatalytic site and adsorptive site. However, this apatite-based photocatalyst is not thought to have such problem, and the strong adsorptive ability of apatite may be effectively available. Several groups reported catalytic activities of calcium phosphates such as thermal oxidation reaction of alcohols, trichloroethylene, and so on. 4,5 Nishikawa suggested a possibility of OH radical reactions, 6 that is, OH radical forms thermally at the surface of CP and attacks adsorbed substrates. In the case of TiHAP, it may form photochemically. Doping of metal ion was reported by Suzuki et al 7 and Wakamura et al 8,9 for HAP with many divalent and trivalent metal ions such as Pb 2+ , Sn 2+ , Cu 2+ , Mn 2+ , Ni 2+ , Co 2+ , Al 3+ , La 3+ , Fe 3+ , and Cr 3+ , and Hashimoto et al 10,11 for -TCP for Li + , Na + , K + , Mg 2+ , Sr 2+ , and Al 3+ , for example. In many cases, limits of the concentration for solid solutions are not so high, and especially for TiHAP, it was suggested that the substitution with Ti 4+ was occurred at columnar site probably with a certain amount of Ca-deficiency. 12 For –TCP, the substitution site may depend on radius of doped metal ion. 10 Anyway, doping of metal ion causes changes in lattice constants and perturbation of electronic states, so that it is plausibly expected that doping of metal ions promote photochemical generation of OH radical. As a photocatalytic coating, self-cleaning property is also important. TiO2 photocatalytic coating has been developed as a self-cleaning material, in terms of its photocatalytic activity and photo-induced superhydrophilicity. 13,14 Small amount of water can spread over its surface due to photo-induced superhydrophilicity, which can easily sweep surface stains away. The photocatalytic activity contributes to the self-cleaning property b
{"title":"PREPARATION OF PHOTOCATALYTIC THIN FILMS OF TRICALCIUM PHOSPHATE BY DOPING TITANIUM(IV) ION","authors":"Naoya Yoshida, Y. Nakamura, T. Okura","doi":"10.3363/PRB.29.31","DOIUrl":"https://doi.org/10.3363/PRB.29.31","url":null,"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). (Received Jan. 16, 2014; Accepted Mar. 5, 2014) INTRODUCTION Previously we have reported preparation of photocatalytic thin film 1 based on a novel apatite Ti-doped calcium hydroxyapatite (TiHAP), 2 which have calcium hydroxyapatite (HAP) structure partially substituted with Ti 4+ ions at calcium sites. This photocatalyst is found to be different from composite systems of TiO2 and an adsorbent (apatite, activated carbon, zeolite, and so on). Yoneyama et al. have revealed that stronger adsorbents lowered the photocatalytic activity of the composite because it prevents migration of adsorbed pollutants on the composite surface. 3 The problem of this composite system is attributable to a distance between photocatalytic site and adsorptive site. However, this apatite-based photocatalyst is not thought to have such problem, and the strong adsorptive ability of apatite may be effectively available. Several groups reported catalytic activities of calcium phosphates such as thermal oxidation reaction of alcohols, trichloroethylene, and so on. 4,5 Nishikawa suggested a possibility of OH radical reactions, 6 that is, OH radical forms thermally at the surface of CP and attacks adsorbed substrates. In the case of TiHAP, it may form photochemically. Doping of metal ion was reported by Suzuki et al 7 and Wakamura et al 8,9 for HAP with many divalent and trivalent metal ions such as Pb 2+ , Sn 2+ , Cu 2+ , Mn 2+ , Ni 2+ , Co 2+ , Al 3+ , La 3+ , Fe 3+ , and Cr 3+ , and Hashimoto et al 10,11 for -TCP for Li + , Na + , K + , Mg 2+ , Sr 2+ , and Al 3+ , for example. In many cases, limits of the concentration for solid solutions are not so high, and especially for TiHAP, it was suggested that the substitution with Ti 4+ was occurred at columnar site probably with a certain amount of Ca-deficiency. 12 For –TCP, the substitution site may depend on radius of doped metal ion. 10 Anyway, doping of metal ion causes changes in lattice constants and perturbation of electronic states, so that it is plausibly expected that doping of metal ions promote photochemical generation of OH radical. As a photocatalytic coating, self-cleaning property is also important. TiO2 photocatalytic coating has been developed as a self-cleaning material, in terms of its photocatalytic activity and photo-induced superhydrophilicity. 13,14 Small amount of water can spread over its surface due to photo-induced superhydrophilicity, which can easily sweep surface stains away. The photocatalytic activity contributes to the self-cleaning property b","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"27 1","pages":"31-35"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82260606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
: A widely-used herbicide, atrazine (ATZ), was investigated in heterogeneous photo-Fenton reaction using four Fe(III)-treated hydroxyapatites, HAP-100-Fe, HAP-200-Fe, HAP-300-Fe, and HAP-400-Fe, which were prepared from hydroxyapatites, HAP-100, HAP-200, HAP-300, and HAP-400, respectively (Taihei Chemical Industrial Co.), and compared with commercially available Fe(III) compounds, Fe 2 O 3 , FePO 4 •2H 2 O, and FeOOH. Among the Fe(III)-hydroxyapatites, HAP-400-Fe indicated the most efficient catalytic activity (ATZ consumption, 90%), which was almost equal to FePO 4 •2H 2 O. Although mineralization of ATZ was never detected by TOC-TN, deethylated, deisopropylated, and OH-substituted ATZs, and related oxidative degradation products were identified from LC-MS analysis of the resulting solution of ATZ photo-Fenton reaction using HAP-400-Fe.
以羟基磷灰石、HAP-100、HAP-200、HAP-300和HAP-400 (Taihei Chemical Industrial Co.)分别制备的四种经Fe(III)处理的羟基磷灰石(HAP-100、HAP-200、HAP-300和HAP-400)为原料，对广泛使用的除草剂阿特拉津(ATZ)进行了非均相光fenton反应研究，并与市售的Fe(III)化合物fe2o3、fepo4•2h2o和FeOOH进行了比较。在Fe(III)-羟基磷灰石中，HAP-400-Fe表现出最有效的催化活性(ATZ消耗90%)，几乎等于fepo4•2h2o。尽管TOC-TN、去乙基化、去异丙基化和oh取代的ATZ都没有检测到ATZ的矿化，并且通过使用HAP-400-Fe对ATZ光- fenton反应产生的溶液进行LC-MS分析，发现了相关的氧化降解产物。
{"title":"HETEROGENEOUS PHOTO-FENTON REACTION OF A HERBICIDE ATRAZINE BY USING Fe(III)-TREATED HYDROXYAPATITES","authors":"T. Moriguchi, Y. Sakamoto, S. Nakagawa","doi":"10.3363/PRB.28.10","DOIUrl":"https://doi.org/10.3363/PRB.28.10","url":null,"abstract":": A widely-used herbicide, atrazine (ATZ), was investigated in heterogeneous photo-Fenton reaction using four Fe(III)-treated hydroxyapatites, HAP-100-Fe, HAP-200-Fe, HAP-300-Fe, and HAP-400-Fe, which were prepared from hydroxyapatites, HAP-100, HAP-200, HAP-300, and HAP-400, respectively (Taihei Chemical Industrial Co.), and compared with commercially available Fe(III) compounds, Fe 2 O 3 , FePO 4 •2H 2 O, and FeOOH. Among the Fe(III)-hydroxyapatites, HAP-400-Fe indicated the most efficient catalytic activity (ATZ consumption, 90%), which was almost equal to FePO 4 •2H 2 O. Although mineralization of ATZ was never detected by TOC-TN, deethylated, deisopropylated, and OH-substituted ATZs, and related oxidative degradation products were identified from LC-MS analysis of the resulting solution of ATZ photo-Fenton reaction using HAP-400-Fe.","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"80 1","pages":"10-23"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79359456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The effects of hydrochloric acid (HCl) on the formation of calcium hydroxyapatite (HAp) particles produced by aging Ca(OH)2 and sodium triphosphate (sodium tripolyphosphate, Natpp: Na5P3O10) mixed solution at 100C for 18 h were examined. The effect of addition of urea was also investigated. In the absence of HCl, the spherical secondary particles with ca. 60 nm in diameter composing by aggregation of spherical primary particles with ca. 20 nm in diameter were produced. Similar aggregated secondary spherical particles were formed up to HCl concentration ([HCl]) of 8 mM. On the contrary, the particles produced at [HCl]≥12 mM were elongated to c-axis and exhibit aggregated rod-like shape, though those produced at [HCl]=20 mM were spherical aggregates with ca. 20 nm in diameter. All the particles produced at [HCl]≤16 mM were HAp, though the sample produced at 20 mM was amorphous. The specific surface areas of the samples were ranged among 84-98 m/g and were fairly agreed with the estimated value of spherical primary particle with 20 nm in diameter. The in situ IR spectra of the HAp particles exhibited very small bulk OH band at 3570 cm. This result indicated that the HAp particles are produced by aggregation mechanism and OH ions along with c-axis in the poorly crystallized primary particles were disordered. The HAp particles with Ca/P molar ratio larger than theoretical value of 1.67 were not exhibited surface P-OH groups at 3656 and 3683 cm. However, the addition of urea produces CaCO3 (calcite) together with HAp and no single HAp crystal was produced. It was revealed that forced hydrolysis reaction of tpp was accelerated by HCl and aggregated secondary spherical particles with unique structure and high specific surface area were obtained. (Received Oct. 8, 2013; Accepted Jan. 16, 2014)
{"title":"PREPARATION AND CHARACTERIZATION OF CALCIUM HYDROXYAPATITE FROM FORCED HYDROLYSIS OF Ca(OH) 2 -TRIPHOSPHATE-HCl MIXED SOLUTION","authors":"K. Kandori, N. Matsui","doi":"10.3363/PRB.28.37","DOIUrl":"https://doi.org/10.3363/PRB.28.37","url":null,"abstract":"The effects of hydrochloric acid (HCl) on the formation of calcium hydroxyapatite (HAp) particles produced by aging Ca(OH)2 and sodium triphosphate (sodium tripolyphosphate, Natpp: Na5P3O10) mixed solution at 100C for 18 h were examined. The effect of addition of urea was also investigated. In the absence of HCl, the spherical secondary particles with ca. 60 nm in diameter composing by aggregation of spherical primary particles with ca. 20 nm in diameter were produced. Similar aggregated secondary spherical particles were formed up to HCl concentration ([HCl]) of 8 mM. On the contrary, the particles produced at [HCl]≥12 mM were elongated to c-axis and exhibit aggregated rod-like shape, though those produced at [HCl]=20 mM were spherical aggregates with ca. 20 nm in diameter. All the particles produced at [HCl]≤16 mM were HAp, though the sample produced at 20 mM was amorphous. The specific surface areas of the samples were ranged among 84-98 m/g and were fairly agreed with the estimated value of spherical primary particle with 20 nm in diameter. The in situ IR spectra of the HAp particles exhibited very small bulk OH band at 3570 cm. This result indicated that the HAp particles are produced by aggregation mechanism and OH ions along with c-axis in the poorly crystallized primary particles were disordered. The HAp particles with Ca/P molar ratio larger than theoretical value of 1.67 were not exhibited surface P-OH groups at 3656 and 3683 cm. However, the addition of urea produces CaCO3 (calcite) together with HAp and no single HAp crystal was produced. It was revealed that forced hydrolysis reaction of tpp was accelerated by HCl and aggregated secondary spherical particles with unique structure and high specific surface area were obtained. (Received Oct. 8, 2013; Accepted Jan. 16, 2014)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"26 1","pages":"37-44"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84621678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Phosphate materials are becoming more important as cathodes and electrolytes in electrochemical energy conversion devices. This review provides an overview of the recent advances in phosphate materials chemistry for lithium ion batteries. The synthesis and processing technologies are particularly focused to provide practical ways to develop advanced lithium ion batteries with high safety. (Received Oct. 8, 2013; Accepted Oct. 15, 2013)
{"title":"PHOSPHATE MATERIALS FOR RECHARGEABLE BATTERY APPLICATIONS","authors":"K. Kanamura, H. Munakata, Y. Namiki","doi":"10.3363/PRB.28.30","DOIUrl":"https://doi.org/10.3363/PRB.28.30","url":null,"abstract":"Phosphate materials are becoming more important as cathodes and electrolytes in electrochemical energy conversion devices. This review provides an overview of the recent advances in phosphate materials chemistry for lithium ion batteries. The synthesis and processing technologies are particularly focused to provide practical ways to develop advanced lithium ion batteries with high safety. (Received Oct. 8, 2013; Accepted Oct. 15, 2013)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"26 1","pages":"30-36"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82210084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Kawamura, Ryosuke Sakamoto, Y. Oshima, J. Otomo
A new, fast proton-conducting TiO2-P2O5 glass-ceramic was developed and investigated through microstructure observation and electrical conductivity measurements. TiO2-P2O5 glass-ceramic samples were prepared by a sol-gel method and post-annealing heat treatment. With an increase in the post-annealing temperature, growth of TiP2O7 crystals in the TiO2P2O5 glassy phase was observed. In addition, a tenfold enhancement in maximum conductivity was observed after postannealing heat treatment compared with the as-prepared sample and polycrystalline TiP2O7. The interfacial layer between the TiO2-P2O5 glassy phase and the TiP2O7 crystal phase may act as a fast proton-conducting path, thereby improving the total conductivity. This hypothesis is discussed using the brick layer model. (Received Sep. 29, 2013; Accepted Nov. 22, 2013)
{"title":"MICROSTRUCTURE OBSERVATION AND ELECTRICAL CONDUCTIVITIES OF PROTON-CONDUCTING TiO2-P2O5 GLASS-CERAMIC SOLID ELECTROLYTES","authors":"R. Kawamura, Ryosuke Sakamoto, Y. Oshima, J. Otomo","doi":"10.3363/PRB.28.24","DOIUrl":"https://doi.org/10.3363/PRB.28.24","url":null,"abstract":"A new, fast proton-conducting TiO2-P2O5 glass-ceramic was developed and investigated through microstructure observation and electrical conductivity measurements. TiO2-P2O5 glass-ceramic samples were prepared by a sol-gel method and post-annealing heat treatment. With an increase in the post-annealing temperature, growth of TiP2O7 crystals in the TiO2P2O5 glassy phase was observed. In addition, a tenfold enhancement in maximum conductivity was observed after postannealing heat treatment compared with the as-prepared sample and polycrystalline TiP2O7. The interfacial layer between the TiO2-P2O5 glassy phase and the TiP2O7 crystal phase may act as a fast proton-conducting path, thereby improving the total conductivity. This hypothesis is discussed using the brick layer model. (Received Sep. 29, 2013; Accepted Nov. 22, 2013)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"76 1","pages":"24-29"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90996685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The yttrium phosphate dihydrate YPO4·2H2O was synthesized by thin-layer technique, and its crystal structure was obtained from X-ray powder diffraction data at room temperature. The structure of YPO4·2H2O was solved by direct methods and refined using the Rietveld analysis. The compound crystallizes in the monoclinic space group C2/c, with unit cell dimensions a = 6.15326(3), b = 14.99687(8), c = 5.57848(3) A, β = 115.4319(4)o, V = 464.896(4) A 3 , Z = 4. It has the gypsum-type crystal structure, with metal-phosphate 2D polymeric network, parallel to the ac plane. Water molecules, coordinated by the yttrium atoms, provide hydrogen bonding between the layers, resulting into a three-dimensional network. The crystal structure of YPO4·2H2O is compared with that of isotypic Y1-x(Gd,Dy,Er)xPO4·2H2O (x = 0.053), investigated earlier.
采用薄层法制备了磷酸钇二水合物YPO4·2H2O，并在室温下通过x射线粉末衍射得到了其晶体结构。用直接法求解了YPO4·2H2O的结构，并用Rietveld分析法对其进行了细化。该化合物在单斜空间群C2/c中结晶，晶胞尺寸a = 6.15326(3)， b = 14.99687(8)， c = 5.57848(3) a， β = 115.4319(4)o, V = 464.896(4) a3, Z = 4。它具有石膏型晶体结构，具有金属-磷酸盐二维聚合物网络，平行于ac平面。由钇原子协调的水分子在层之间提供氢键，形成一个三维网络。将YPO4·2H2O的晶体结构与先前研究的同型Y1-x(Gd,Dy,Er)xPO4·2H2O (x = 0.053)的晶体结构进行比较。
{"title":"PREPARATION AND STRUCTURE OF THE YTTRIUM PHOSPHATE DIHYDRATE YPO4·2H2O","authors":"L. Ivashkevich, A. Lyakhov, A. F. Selevich","doi":"10.3363/PRB.28.45","DOIUrl":"https://doi.org/10.3363/PRB.28.45","url":null,"abstract":"The yttrium phosphate dihydrate YPO4·2H2O was synthesized by thin-layer technique, and its crystal structure was obtained from X-ray powder diffraction data at room temperature. The structure of YPO4·2H2O was solved by direct methods and refined using the Rietveld analysis. The compound crystallizes in the monoclinic space group C2/c, with unit cell dimensions a = 6.15326(3), b = 14.99687(8), c = 5.57848(3) A, β = 115.4319(4)o, V = 464.896(4) A 3 , Z = 4. It has the gypsum-type crystal structure, with metal-phosphate 2D polymeric network, parallel to the ac plane. Water molecules, coordinated by the yttrium atoms, provide hydrogen bonding between the layers, resulting into a three-dimensional network. The crystal structure of YPO4·2H2O is compared with that of isotypic Y1-x(Gd,Dy,Er)xPO4·2H2O (x = 0.053), investigated earlier.","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"119 1","pages":"45-50"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74035733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuichiro Banba, T. Umeda, H. Kuroe, T. Toyama, Y. Musha, K. Itatani
: The conditions for the homogeneous coating of hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ; HAp) on the multi-wall carbon nanotubes (MWCNTs) were examined via the processes of (i) the acid treatment of conc . nitric and sulfuric acids at 50 C for 24 h or the citric acid at 300 and 350°C for 0.5 h in Ar atmosphere in order to form carboxyl group, and (ii) the microwave heating (100 C, 5 min) of acid-treated MWCNTs in the “apatite-dissolved solution” prepared by bubbling CO 2 gas into the commercial HAp-dispersed water. The microwave heating of surface-modified MWCNTs (the citric acid treatment at 300°C for 0.5 h) in the apatite-dissolved solution was effective in the homogeneous coating of calcium-deficient HAp (Ca/P ratio =1.57), compared to the case of surface modification by conc . nitric and
{"title":"HOMOGENEOUS COATING OF HYDROXYAPATITE ON MULTI-WALL CARBON NANOTUBE IMMERSED IN CALCIUM PHOSPHATESOLUTION BY MICROWAVE HEATING","authors":"Yuichiro Banba, T. Umeda, H. Kuroe, T. Toyama, Y. Musha, K. Itatani","doi":"10.3363/PRB.28.51","DOIUrl":"https://doi.org/10.3363/PRB.28.51","url":null,"abstract":": The conditions for the homogeneous coating of hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ; HAp) on the multi-wall carbon nanotubes (MWCNTs) were examined via the processes of (i) the acid treatment of conc . nitric and sulfuric acids at 50 C for 24 h or the citric acid at 300 and 350°C for 0.5 h in Ar atmosphere in order to form carboxyl group, and (ii) the microwave heating (100 C, 5 min) of acid-treated MWCNTs in the “apatite-dissolved solution” prepared by bubbling CO 2 gas into the commercial HAp-dispersed water. The microwave heating of surface-modified MWCNTs (the citric acid treatment at 300°C for 0.5 h) in the apatite-dissolved solution was effective in the homogeneous coating of calcium-deficient HAp (Ca/P ratio =1.57), compared to the case of surface modification by conc . nitric and","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"20 1","pages":"51-57"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72912199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Titanium phosphates were prepared with various concentrations of added glycerin as a novel white pigment for cosmetics. Their chemical composition, powder properties, photocatalytic activity, color phase, and smoothness were studied. The obtained materials had a higher Ti/P ratio than that used in preparation conditions because of the formation of titanium oxide and hydroxide. These titanium phosphates had less photocatalytic activity to protect the sebum on the skin. The obtained materials and their thermal products at 100°C showed high reflectance at the range of visible light. (Received Jan. 1, 2013; Accepted Jun. 28, 2013)
{"title":"INFLUENCE OF ADDED GLYCERIN CONCENTRATION ON PREPARATION AND POWDER PROPERTIES OF TITANIUM PHOSPHATES","authors":"H. Onoda, T. Yamaguchi, T. Toyama","doi":"10.3363/PRB.28.1","DOIUrl":"https://doi.org/10.3363/PRB.28.1","url":null,"abstract":"Titanium phosphates were prepared with various concentrations of added glycerin as a novel white pigment for cosmetics. Their chemical composition, powder properties, photocatalytic activity, color phase, and smoothness were studied. The obtained materials had a higher Ti/P ratio than that used in preparation conditions because of the formation of titanium oxide and hydroxide. These titanium phosphates had less photocatalytic activity to protect the sebum on the skin. The obtained materials and their thermal products at 100°C showed high reflectance at the range of visible light. (Received Jan. 1, 2013; Accepted Jun. 28, 2013)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"101 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78097434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rikako Miyamoto, H. Inoue, Kenta Ohashi, H. Shibata, Meguro Takashi, Fukuyama Shigeo, K. Hashimoto
Tricalcium phosphate doped with a small amount of both V(III) and V(V) ions (V-β-TCPV) was successfully prepared using a solid-state reaction, and its in vitro cell cytotoxicity was investigated using V79 cells. We found that the V(III) ion was substituted for a Ca ion at the Ca(5) site located in the β-Ca3(PO4)2 (β-TCP) crystal structure and that the V(V) ion was substituted for a P ion in the PO4 group of the β-TCP crystal structure. The cell cytotoxicity of the V-β-TCPVs increased gradually with increasing amounts of vanadium ion doping. The β-TCP doped with 1.0 mol% vanadium ions showed low toxicity. V-β-TCPVs doped with a small amount of vanadium ions are expected to be significant new implant biomaterials. (Received June 14, 2012; Accepted June 20, 2012)
{"title":"EVALUATION OF THE CELL CYTOTOXICITY OF β-TRICALCIUM PHOSPHATE DOPED WITH VANADIUM IONS","authors":"Rikako Miyamoto, H. Inoue, Kenta Ohashi, H. Shibata, Meguro Takashi, Fukuyama Shigeo, K. Hashimoto","doi":"10.3363/PRB.26.113","DOIUrl":"https://doi.org/10.3363/PRB.26.113","url":null,"abstract":"Tricalcium phosphate doped with a small amount of both V(III) and V(V) ions (V-β-TCPV) was successfully prepared using a solid-state reaction, and its in vitro cell cytotoxicity was investigated using V79 cells. We found that the V(III) ion was substituted for a Ca ion at the Ca(5) site located in the β-Ca3(PO4)2 (β-TCP) crystal structure and that the V(V) ion was substituted for a P ion in the PO4 group of the β-TCP crystal structure. The cell cytotoxicity of the V-β-TCPVs increased gradually with increasing amounts of vanadium ion doping. The β-TCP doped with 1.0 mol% vanadium ions showed low toxicity. V-β-TCPVs doped with a small amount of vanadium ions are expected to be significant new implant biomaterials. (Received June 14, 2012; Accepted June 20, 2012)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"89 1","pages":"113-116"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74623449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jumpei Hayashi, M. Kawashita, T. Miyazaki, M. Kamitakahara, K. Ioku, H. Kanetaka
Adsorption behavior of bovine serum albumin (BSA) and osteopontin (OPN) on osteoconductive hydroxyapatite (HA) and non-osteoconductive alpha-type alumina (-Al2O3) was studied as function of protein concentration and pH, using Bradford dye binding assay. BSA showed a much larger binding capacity on -Al2O3 than that on HA irrespective of BSA solution concentration and pH. Furthermore, OPN is likely to show the same adsorption characteristic as BSA. Definite correlation was not observed between the albumin or OPN adsorption capacity and the osteoconductivity of materials, suggesting that other factors (e.g., orientation, arrangement, etc. of albumin and/or OPN) likely govern expression of the osteoconductivity. (Received February 2, 2012; Accepted March 30, 2012)
{"title":"COMPARISON OF ADSORPTION BEHAVIOR OF BOVINE SERUM ALBUMIN AND OSTEOPONTIN ON HYDROXYAPATITE AND ALUMINA","authors":"Jumpei Hayashi, M. Kawashita, T. Miyazaki, M. Kamitakahara, K. Ioku, H. Kanetaka","doi":"10.3363/PRB.26.23","DOIUrl":"https://doi.org/10.3363/PRB.26.23","url":null,"abstract":"Adsorption behavior of bovine serum albumin (BSA) and osteopontin (OPN) on osteoconductive hydroxyapatite (HA) and non-osteoconductive alpha-type alumina (-Al2O3) was studied as function of protein concentration and pH, using Bradford dye binding assay. BSA showed a much larger binding capacity on -Al2O3 than that on HA irrespective of BSA solution concentration and pH. Furthermore, OPN is likely to show the same adsorption characteristic as BSA. Definite correlation was not observed between the albumin or OPN adsorption capacity and the osteoconductivity of materials, suggesting that other factors (e.g., orientation, arrangement, etc. of albumin and/or OPN) likely govern expression of the osteoconductivity. (Received February 2, 2012; Accepted March 30, 2012)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"7 1","pages":"23-28"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90032138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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