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Kikuo OKUYAMA, Koichi NAKASO
2001 Volume 8 Issue 295 Pages
409-417
Published: November 01, 2001
Released on J-STAGE: March 07, 2011
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Yoshiyuki HATTORI, Hideki TANAKA, Katsumi KANEKO
2001 Volume 8 Issue 295 Pages
418-427
Published: November 01, 2001
Released on J-STAGE: March 07, 2011
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Shinryo YABE, Mika YAMASHITA, Shigeyoshi MOMOSE, Sakae YOSHIDA, Kei HA ...
2001 Volume 8 Issue 295 Pages
428-433
Published: November 01, 2001
Released on J-STAGE: March 07, 2011
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Nanoparticles of calcia doped ceria coated with amorphous silica were prepared for UV shielding via soft solution chemical routes at 40-90°C. The oxidation catalytic activity of ceria was effectively depressed by doping with calcia and/or coating with silica. Doping with calcia resulted in extremely decreasing the particle size (2-4 nm), and consequently increasing UV light (λ<400 nm) absorbing capacity and transparency in the visible ray region (λ>400 nm).
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Kiyoshi ITATANI, Motoaki KATOH, Masanori KASAI, F. Scott HOWELL
2001 Volume 8 Issue 295 Pages
434-440
Published: November 01, 2001
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Changes in mechanical strength of magnesium oxide (MgO) ceramics (relative densities ≥99.0%) with average grain sizes of 34.8 μm, 12.8 μm, and 0.65 μm under repeated heating and cooling have been examined. The heating and cooling of MgO ceramic with diameter of 20 mm and thickness of 1.5 mm were repeated between base temperature (
TB : 900°C) and lower limit temperature. The temperature difference (Δ
T) between
TB and
TL was changed from 100°C to 500°C; the heating-cooling rate of these MgO specimens was either 100°C·min
-1 or 200°C·min
-1. Appreciable decreases in residual flexural strength of MgO specimen with average grain size of 0.65 μm were observed as Δ
T, the number of heating-cooling cycles, or the heating-cooling rate increased. The thermal damage of MgO specimen was less severe compared to the thermal shock resistance (water-quench test) but the trends were similar to one another.
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Takahiro TAKEI, Ryu-ichi KANAMORI, Nobuhiro KUMADA, Nobukazu KINOMURA
2001 Volume 8 Issue 295 Pages
441-446
Published: November 01, 2001
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Modification of hexagonal-type mesoporous silica via intercalation of PVA and its adsorption properties were investigated. The hexagonal-type mesoporous silica was formed from Si (OC
2H
5)
4 and self-assembly of C
16H
33N (CH
3)
3Br. In order to intercalate PVA, the produced mesoporous silica was dipped into PVA aqueous solution with stirring, followed by firing at 300-800°C in N
2 atmosphere for immobilization of PVA. Thickness of PVA layer in intercalated mesoporous silica was evaluated from its composition and thermogravimetry. The thickness of around 0.1 nm was found to decrease with elevating the firing temperature and the carbonization fraction of the layer increased linearly. The adsorption properties were investigated by using O
2 and N
2 gases at 25°C. The ratio of adsorption volume, O
2/N
2, decreased apparently depending on firing temperature. Since the decrease of the ratio was in agreement with the amount of PVA that was not carbonized yet, the adsorption ability of O
2 was considered to be attributed to organic species.
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Satoshi TANAKA, Osamu MACHINAGA, Yoshio AOYAMA
2001 Volume 8 Issue 295 Pages
447-454
Published: November 01, 2001
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Calcium ferrite mono-nitrate hydrate (hereafter abbreviated as CFMNH) obtained at 60°C by a reaction between Ca (OH)
2 suspension and Fe (NO
3)
3 solution was characterized by XRD, FT-IR, DTA-TG and SEM-EDX. The synthesized CFMNH was the puseudo-hexagonal layer compound with basal spacing of 1.04 nm which is equivalent to half of the lattice constant
c. By heating CFMNH below 100°C, this basal spacing was decreased from 1.04 nm at room temperature through 0.86 nm at 60°C to 0.80 nm at 100°C. These CFMNHs were also indexed tentatively as puseudo-hexagonal symmetry.
To study change of basal spacing with pH, 1.04 nm CFMNH suspension was stirred for 1 hour at room temperature in various pH solutions adjusted from about 12 to 13 with NaOH. The basal spacing of CFMNH decreased from 1.04 nm to 0.76 nm with increase of pH. The 0.76 nm spacing of CFMNH was finally settled to 0.80 nm by a longer aging process. The three types of CFMNH with different basal spacings were obtained by pH control as well as by thermal dehydration. However, the chemical composition and structure of 0.80 nm CFMNH obtained at room temperature by pH control were different from those of 0.80 nm CFMNH obtained by thermal dehydration in terms of carbonate contents, degree of hydrogen bond and stacking mode of layers.
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Takayasu IKEGAMI
2001 Volume 8 Issue 295 Pages
455-462
Published: November 01, 2001
Released on J-STAGE: March 07, 2011
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Mamoru SENNA
2001 Volume 8 Issue 295 Pages
463-468
Published: November 01, 2001
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Hydrothermal Soft Chemical Process
Qi FENG, Kazumichi YANAGISAWA
2001 Volume 8 Issue 295 Pages
469-477
Published: November 01, 2001
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Tetsuo UCHIKOSHI
2001 Volume 8 Issue 295 Pages
478-483
Published: November 01, 2001
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Yukiya HAKUTA, Tadafumi ADSCHIRI, Kunio ARAI
2001 Volume 8 Issue 295 Pages
484-490
Published: November 01, 2001
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Hideki MONMA
2001 Volume 8 Issue 295 Pages
491-497
Published: November 01, 2001
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Hitoshi SHINDO
2001 Volume 8 Issue 295 Pages
498-506
Published: November 01, 2001
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Masatoshi CHIKAZAWA, Masayoshi FUJI
2001 Volume 8 Issue 295 Pages
507-514
Published: November 01, 2001
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Mitsutaka KITAMURA
2001 Volume 8 Issue 295 Pages
515-522
Published: November 01, 2001
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Tamotsu YASUE
2001 Volume 8 Issue 295 Pages
523-539
Published: November 01, 2001
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Toshihiro KOGURE, Junzo TANAKA
2001 Volume 8 Issue 295 Pages
540-544
Published: November 01, 2001
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Kiyoshi OKADA
2001 Volume 8 Issue 295 Pages
545-552
Published: November 01, 2001
Released on J-STAGE: August 16, 2011
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Yoshihiko OKADA
2001 Volume 8 Issue 295 Pages
553-557
Published: November 01, 2001
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Keizo SUZUKI
2001 Volume 8 Issue 295 Pages
558-567
Published: November 01, 2001
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Shunsuke HANEHARA, Makihiko ICHIKAWA
2001 Volume 8 Issue 295 Pages
568-574
Published: November 01, 2001
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Seishi Goto, Norio Yamaguchi
2001 Volume 8 Issue 295 Pages
575-579
Published: November 01, 2001
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Atsushi SHIMOJIMA, Kazuyuki KURODA
2001 Volume 8 Issue 295 Pages
580-585
Published: November 01, 2001
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Kiyokazu NAKAGAWA
2001 Volume 8 Issue 295 Pages
586-592
Published: November 01, 2001
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Hitoshi SHINDO
2001 Volume 8 Issue 295 Pages
593-600
Published: November 01, 2001
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Junji YAMANAKA
2001 Volume 8 Issue 295 Pages
601-606
Published: November 01, 2001
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Hideto SAKANE
2001 Volume 8 Issue 295 Pages
607-614
Published: November 01, 2001
Released on J-STAGE: August 16, 2011
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Hirokazu NAKAYAMA
2001 Volume 8 Issue 295 Pages
615-624
Published: November 01, 2001
Released on J-STAGE: August 16, 2011
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