巻号一覧
57 巻, 7 号
July
選択された号の論文の13件中1～13を表示しています
- |<
- <
- 1
- >
- >|
研究
研究
-
加藤 昌宏, 林 憲二, 吉田 政幹, 福田 政則, 荒木 敏春, 鮎川 昇, 幸田 勝実, 菊地 正2010 年 57 巻 7 号 p. 485-491
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスThe press process of molybdenum is done without using an organic binder when the molybdenum is manufactured at high temperature used in powder metallurgy. The decrease in the molybdenum ingot density, which was a factor in the yield decrease of the molybdenum product, is occurred because of remaining moisture and the presence of molybdenum oxide in molybdenum metal powder. To clarify the cause of the yield decrease, the uniform distribution process of the rare earth salt by wet doping into molybdenum and the molybdenum elution to water were examined. The dopants provide a unique effect on the thermal-deformation resistance of molybdenum. In solvents of purified water and tap water, the amount of elution of molybdenum was examined as dependence on molybdenum particle sizes and the temperatures of the solvent. Moreover, elution results obtained using alkali and acid water solvents were compared. As a result, it can be suggested that a steady dope manufacturing condition can be obtained by using the metallic molybdenum or MoO2 as the raw powder, as well as by the use of purified water held at a low temperature.抄録全体を表示PDF形式でダウンロード (1264K)
特集：材料化学テクトニクスによる革新的機能の創製
総報
-
中平 敦2010 年 57 巻 7 号 p. 494
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスPDF形式でダウンロード (150K)
総説
-
西村 達也, 加藤 隆史2010 年 57 巻 7 号 p. 495-499
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスBiominerals such as bones, teeth, the nacre of shells, and spicules of sea urchins are organic-inorganic hybrids. They have highly controlled hierarchical and complex structures. The formation processes of these biominerals are controlled by macromolecular templates of proteins, peptides, and polysaccharides in mild conditions. Biominerals have attracted much attention, because materials scientists can obtain the idea from their hierarchical structures, properties, and formation processes for use in creating synthetic, and biomimetic materials. This review highlights our recent approaches on bioinspired syntheses for the development of organic/CaCO3 hybrids using macromolecular templates. The cooperative interactions between soluble acidic polymers and insoluble matrices have affected the CaCO3 crystallization. Their polymorph, orientation, and complex structures can be tuned by the conditions. These materials have great potentials for new functional materials.抄録全体を表示PDF形式でダウンロード (1555K) -
田中 勝久, 藤田 晃司, 村井 俊介2010 年 57 巻 7 号 p. 500-507
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスThermal poling is a process that a high voltage, or a strong electric field, is applied to a dielectric material at an elevated temperature. For glass materials, this technique has been mainly utilized to induce optical second-order nonlinearity in glass, which is a prototype of an optically isotropic material and has been believed not to show the second-order nonlinearity because of its macroscopic structure possessing inversion symmetry. On the other hand, ion implantation can be achieved during the thermal poling of glass if a dielectric material bearing ions with high mobility such as alkali metal ions is inserted in between an electrode and the glass material to be poled. In such a situation, the mobile ions can move into the glass from the dielectric material, and the glass structure is modified by the incoming ions, leading to a change in properties of the glass. In this review article, we describe about optical functions induced in tellurite glasses by the thermal poling/ion implantation technique. The optical functions are second-harmonic generation and surface plasmon enhanced birefringence, both of which are attained by the thermal poling/ion implantation process.抄録全体を表示PDF形式でダウンロード (1244K)
解説
-
小西 康裕, 荻 崇, 斉藤 範三2010 年 57 巻 7 号 p. 508-513
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスAlthough chemical and physical synthetic routes to noble metal nanoparticles have been extensively developed, another possibility is biological synthesis by reduction of noble metal ions using microorganism. We focused on the Fe(III)-reducing bacteria Shewanella algae and Shewanella oneidensis as a candidate microbe for rapid reductive deposition of noble metal at room temperature, because the reduction potential of Fe(III) ions is almost equal to that of noble metal ions. Intracellular synthesis of noble metal (Au, Pd, Pt) nanoparticles was achieved at room temperature using resting cells of the Fe(III)-reducing bacteria, when either formate or lactate was provided as the electron donor. The bioreductive deposition of noble metal was a fast process: 1-10 mol/m3 aqueous Pd(II) ions were completely reduced to crystalline Pd(0) nanoparticles within 60 min. Biogenic metal nanoparticles 5-10 nm in size were located in the periplasmic space of bacterial cells. The dried biomass-supported palladium was applicable to a heterogeneous catalyst in a chemical reaction and an anode catalyst in a fuel cell for power production. Our methodology for the room-temperature synthesis of noble metal nanoparticles using the Fe(III)-reducing bacteria is an attractive green process that is cost-effective and environmentally benign.抄録全体を表示PDF形式でダウンロード (931K)
受賞記念講演
-
辻野 二朗, 山崎 勳, 嶋田 志郎2010 年 57 巻 7 号 p. 514-519
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスMonolithic and composite ceramic films of TiN, Ti-Al-N, Ti-B-C-N and PSZ were prepared at relatively higher deposition rate (approximately 100 nm/min) and at lower temperature (< 800°C) by a novel thermal plasma CVD designed to spray Ti-, Al-, B-, or Zr-alkoxide solutions into Ar/H2/N2 thermal plasma. Chemical compositions of composite films were controlled by changing of mixing ratios of two kinds of alkoxide solutions and N2 flow rates. PSZ films were prepared by mild oxidation of Y- and Zr-alkoxide solutions with water introduced into the thermal Ar/N2 plasma without oxidation of under layer TiN. Cutting tests of composite TiBCN films deposited on WC-Co cutting tools exhibited better wear resistance compared with commercial TiN coated cutting tools.抄録全体を表示PDF形式でダウンロード (1131K)
研究
-
田中 優実, 岩崎 健, 片山 恵一, 北條 純一, 山下 仁大2010 年 57 巻 7 号 p. 520-528
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスTo provide bioelectrets with controlled electrical energy, the polarization characteristics of stoichiometric and nonstoichiometric hydroxyapatite (HA) ceramics were investigated in terms of crystal structures using Rietvelt analysis technique. HA ceramics with and without hydroxide ion defects were prepared at 1250°C for 2 h under streaming steam (for stoichiometric HA; w-HA) and air (for hydroxide-deficient HA; a-HA). Polarization of ceramics was done at 400°C for 1 h under a 5 kVcm-1 DC electrical field. Based on a result of thermally stimulated depolarization current (TSDC) measurement, the charge storage (Q) of polarized ceramics was significantly influenced by sintering atmosphere; Q value of a-HA was about 7 times larger than that of w-HA. Rietvelt analysis of XRD spectra suggests that a dipole formation of a-HA was probably due to the proton displacement form hydroxide ions to phosphate ions, while w-HA was likely polarized by proton migration between hydroxide ions. The dominant usage of phosphate ion as a proton localization site should contribute for the improvement of polarization property of a-HA.抄録全体を表示PDF形式でダウンロード (2535K) -
佐藤 充孝, 中平 敦2010 年 57 巻 7 号 p. 529-532
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスDevelopment of non toxic magnetic beads has been strongly desired to cure more effectively for patients having diseases such as cancer and osteosarcoma. In this study, Fe doped calcium phosphate powders were prepared by aqueous solution process. The crystal phase of obtained samples had a hydroxyapatite (HAp)-related structure with low crystallinity, and the crystallinity of samples decreased with increasing ratio of Fe (RFe). The crystallinity of samples improved by heat treatment more than 1073 K for 2 hours and α-Fe2O3 phase was generated as a second phase. The lattice parameter of HAp phase drastically changed at RFe=1 mol% caused by the difference of ion radius between Ca ion and Fe ion, and there was a trend of that the a-axis shrinks and c-axis expands by further increment of RFe. The obtained powders had granular crystals with 10 nm in diameter. All samples showed paramagnetic property, and the maximum magnetization was 3×10-2 emu/g at RFe=5 mol%.抄録全体を表示PDF形式でダウンロード (549K) -
中平 敦, 中田 健太郎, 佐藤 充孝2010 年 57 巻 7 号 p. 533-536
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスHydroxyapatite (HAP) possesses extremely high ability of bioactivity and ion exchange. In this study, hydroxyapatite containing amorphous silica was prepared by heat-treatment in air atmosphere for the mixture of hydroxyapatite and amorphous silica powders in order to develop the high performance modified hydroxyapatites. Their microstructures of the samples prepared by heat-treatment at various temperatures were examined by scanning electron microscopy (SEM) and their characterizations were evaluated with X-ray diffraction (XRD) and fourier transform infrared spectrophotometry (FT-IR) and so on. XRD results indicated that the incorporation of Si ion as a SiO44- into PO43- site arose the increase of lattice constants for hydroxyapatite structure. These results suggested that SiO44 was substituted to PO43- site in HAP structures, leading to the successful synthesis of Si-incorporated hydroxyapatite.抄録全体を表示PDF形式でダウンロード (542K) -
井原 梨恵, 高橋 雅英2010 年 57 巻 7 号 p. 537-541
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスPhoto-curable organoborosilicate glasses were synthesized through a catalyst- and solvent-free and non-aqueous alcohol condensation process at low temperature below 100°C. Formation of Si-O-B linkage was confirmed by IR spectra. After irradiation of UV-light, we have successfully cured the prepolymer coatings into prepared transparent and homogeneous thin film. A refractive index of the thin film of B(OH)3: 3-Methacryloxypropyltrimethoxysilane=1:1 composition was measured by a prism coupling method n=1.515 at 633 nm. Moreover, pencil hardnesses according to JIS5400 of photo-cured thin film before and after heat treatment at 550°C were 6H and over 10H, respectively. We demonstrated fabrication of microstructures on transparent thin film by embossing process followed by photo curing.抄録全体を表示PDF形式でダウンロード (897K) -
中平 敦, 長沼 宏和, 門田 太郎2010 年 57 巻 7 号 p. 542-545
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスZrO2 ceramics containing CaO or MgO as an additive were fabricated by the spark plasma sintering (SPS) method and pressureless sintering (PS) method at 1300°C and 1500°C. Sintered samples were characterized by XRD and their microstructures were observed by SEM. Spark plasma sintering resulted in the successful fabrication of tetragonal ZrO2 bulks with fully dense microstructures over 99 % of theoretical density, although ones prepared by the pressureless sintering (PS) method had the lower density of 93 %.抄録全体を表示PDF形式でダウンロード (942K)
本会記事
-
2010 年 57 巻 7 号 p. Pref7_1
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスPDF形式でダウンロード (101K) -
2010 年 57 巻 7 号 p. Mtg7_2-Mtg7_5
発行日: 2010年
公開日: 2010/09/16
ジャーナル オープンアクセスPDF形式でダウンロード (258K)
- |<
- <
- 1
- >
- >|