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Journal Articles

Structural Approach to Understanding the Formation of Amorphous Metal Hydroxides

Kobayashi, Taishi*; Fushimi, Tomokazu*; Mizukoshi, Hirofumi*; Motokawa, Ryuhei; Sasaki, Takayuki*

Langmuir, 38(48), p.14656 - 14665, 2022/12

https://doi.org/10.1021/acs.langmuir.2c02081

Times Cited Count：0 Percentile：0(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Oxidation mechanisms of hafnium overlayers deposited on an Si(111) substrate

Kakiuchi, Takuhiro*; Matoba, Tomoki*; Koyama, Daisuke*; Yamamoto, Yuki*; Yoshigoe, Akitaka

Langmuir, 38(8), p.2642 - 2650, 2022/03

https://doi.org/10.1021/acs.langmuir.1c02711

Times Cited Count：0 Percentile：0(Chemistry, Multidisciplinary)

0xidation processes at the interface and the surface of Si(111) substrate with thin Hf films were studied using photoelectron spectroscopy in conjunction with supersonic oxygen molecular beams (SOMB). The oxidation starts at the outermost Hf layers and produces stoichiometric HfO $_{2}$ . Hf silicates (Hf-O-Si configuration) were generated in the vicinity of the HfO $_{2}$ /Si interface in the case of the irradiation of 2.2 eV SOMB. The oxidation of the Si substrate takes place to generate SiO $_{2}$ compounds. Si atoms were emitted from the SiO $_{2}$ /Si interface region underneath the HfO $_{2}$ overlayers to release the stress generated within the strained Si layers. The emitted Si atoms can pass through the HfO $_{2}$ overlayers and react with the impinging O $_{2}$ gas.

Journal Articles

In situ neutron reflectometry analysis of interfacial structure formation between phenolic resin and silica during curing

Izumi, Atsushi*; Shudo, Yasuyuki*; Shibayama, Mitsuhiro*; Miyata, Noboru*; Miyazaki, Tsukasa*; Aoki, Hiroyuki

Langmuir, 37(47), p.13867 - 13872, 2021/11

https://doi.org/10.1021/acs.langmuir.1c02313

Times Cited Count：2 Percentile：24.57(Chemistry, Multidisciplinary)

Journal Articles

Oxidation of anatase TiO $_{2}$ (001) surface using supersonic seeded oxygen molecular beam

Katsube, Daiki*; Ono, Shinya*; Takayanagi, Shuhei*; Ojima, Shoki*; Maeda, Motoyasu*; Origuchi, Naoki*; Ogawa, Arata*; Ikeda, Natsuki*; Aoyagi, Yoshihide*; Kabutoya, Yuito*; et al.

Langmuir, 37(42), p.12313 - 12317, 2021/10

https://doi.org/10.1021/acs.langmuir.1c01752

Times Cited Count：1 Percentile：12.03(Chemistry, Multidisciplinary)

We investigated the oxidation of oxygen vacancies at the surface of anatase TiO $_{2}$ (001) using supersonic seeded molecular beam (SSMB) of oxygen. The oxygen vacancies at the top-surface and sub-surface could be eliminated by the supply of oxygen using an SSMB. These results indicate that the interstitial vacancies can be mostly assigned to oxygen vacancies, which can be effectively eliminated by using an oxygen SSMB. Oxygen vacancies are present on the surface of anatase TiO $_{2}$ (001) when it is untreated before transfer to a vacuum chamber. These vacancies, which are stable in the as-grown condition, could also be effectively eliminated using the oxygen SSMB.

Journal Articles

Layered structure in the crystalline adsorption layer and the leaching process of poly(vinyl alcohol) revealed by neutron reflectivity

Miyazaki, Tsukasa*; Miyata, Noboru*; Arima, Hiroshi*; Kira, Hiroshi*; Ouchi, Keiichi*; Kasai, Satoshi*; Tsumura, Yoshihiro*; Aoki, Hiroyuki

Langmuir, 37(32), p.9873 - 9882, 2021/08

https://doi.org/10.1021/acs.langmuir.1c01563

Times Cited Count：4 Percentile：46.37(Chemistry, Multidisciplinary)

Journal Articles

Neutron reflectometry tomography for imaging and depth structure analysis of thin films with in-plane inhomogeneity

Aoki, Hiroyuki; Ogawa, Hiroki*; Takenaka, Mikihito*

Langmuir, 37(1), p.196 - 203, 2021/01

https://doi.org/10.1021/acs.langmuir.0c02744

Times Cited Count：1 Percentile：12.03(Chemistry, Multidisciplinary)

Journal Articles

Water distribution in Nafion thin films on hydrophilic and hydrophobic carbon substrates

Ito, Kanae; Harada, Masashi*; Yamada, Norifumi*; Kudo, Kenji*; Aoki, Hiroyuki; Kanaya, Toshiji*

Langmuir, 36(43), p.12830 - 12837, 2020/11

https://doi.org/10.1021/acs.langmuir.0c01917

Times Cited Count：12 Percentile：58.79(Chemistry, Multidisciplinary)

Journal Articles

Detailed structural study on the poly(vinyl alcohol) adsorption layers on a Si substrate with solvent vapor-induced swelling

Miyazaki, Tsukasa*; Miyata, Noboru*; Yoshida, Tessei*; Arima, Hiroshi*; Tsumura, Yoshihiro*; Torikai, Naoya*; Aoki, Hiroyuki; Yamamoto, Katsuhiro*; Kanaya, Toshiji*; Kawaguchi, Daisuke*; et al.

Langmuir, 36(13), p.3415 - 3424, 2020/04

https://doi.org/10.1021/acs.langmuir.9b03964

Times Cited Count：12 Percentile：65.41(Chemistry, Multidisciplinary)

Journal Articles

Elucidation of a heterogeneous layered structure in the thickness direction of poly(vinyl alcohol) films with solvent vapor-induced swelling

Miyazaki, Tsukasa*; Miyata, Noboru*; Asada, Mitsunori*; Tsumura, Yoshihiro*; Torikai, Naoya*; Aoki, Hiroyuki; Yamamoto, Katsuhiro*; Kanaya, Toshiji*; Kawaguchi, Daisuke*; Tanaka, Keiji*

Langmuir, 35(34), p.11099 - 11107, 2019/08

https://doi.org/10.1021/acs.langmuir.9b01665

Times Cited Count：19 Percentile：70.65(Chemistry, Multidisciplinary)

Journal Articles

Structural approach to understanding the solubility of metal hydroxides

Kobayashi, Taishi*; Nakajima, Shogo*; Motokawa, Ryuhei; Matsumura, Daiju; Saito, Takumi*; Sasaki, Takayuki*

Langmuir, 35(24), p.7995 - 8006, 2019/06

https://doi.org/10.1021/acs.langmuir.9b01132

Times Cited Count：2 Percentile：10.48(Chemistry, Multidisciplinary)

Journal Articles

Mesoscopic structures of vermiculite and weathered biotite clays in suspension with and without cesium ions

Motokawa, Ryuhei; Endo, Hitoshi*; Yokoyama, Shingo*; Ogawa, Hiroki*; Kobayashi, Toru; Suzuki, Shinichi; Yaita, Tsuyoshi

Langmuir, 30(50), p.15127 - 15134, 2014/12

https://doi.org/10.1021/la503992p

Times Cited Count：25 Percentile：63.18(Chemistry, Multidisciplinary)

Journal Articles

Enzymatic fabrication of protein-decorated gold nanoparticles by the aid of artificial peptides with gold-binding affinity

Niide, Teppei*; Shimojo, Kojiro; Wakabayashi, Rie*; Goto, Masahiro*; Kamiya, Noriho*

Langmuir, 29(50), p.15596 - 15605, 2013/12

https://doi.org/10.1021/la401327h

Times Cited Count：13 Percentile：40.84(Chemistry, Multidisciplinary)

Journal Articles

Chemical modification of the internal surfaces of cylindrical pores of submicrometer size in poly(ethylene terephthalate)

Maekawa, Yasunari; Suzuki, Yasuyuki; Maeyama, Katsuya*; Yonezawa, Noriyuki*; Yoshida, Masaru

Langmuir, 22(6), p.2832 - 2837, 2006/03

https://doi.org/10.1021/la051583z

Times Cited Count：6 Percentile：29.48(Chemistry, Multidisciplinary)

Chemical modification of the internal surfaces of cylindrical pores with sub-micrometer of pore diameter in PET film was examined. The modification involved the alkylation of the carboxylic acid on the surfaces with the alkylation reagent containing a fluorescent probe, and it was monitored by observing the change in fluorescent emission intensity. When the DMF solution of 4-(bromomethyl)-6,7-dimethoxycoumarin (BrCU), which bore a coumarin fluorophore, was introduced into the pores, the emission and excitation intensities of the membranes increased proportionally with increases of the pore surface areas. Fluorescent spots of about 300 nm in diameter, which were located at the positions of the pores, can be observed in the fluorescence microscope image of the membranes, indicating that highly concentrated fluorescent probes are chemically incorporated on the internal surfaces of the cylindrical pores with 210 nm in diameter in the membranes. In the reactions of the PET surfaces with BrCU, the fluorescent intensities increased with increases of the contact angles. This result indicates that the hydrophilicity of the internal pore surfaces can be qualitatively modified by controlling the change in the fluorescent intensities.

Journal Articles

Alternate multilayer deposition from ammonium amphiphiles and titanium dioxide crystalline nanosheets using the Langmuir-Blodgett technique

Yamaki, Tetsuya; Asai, Keisuke*

Langmuir, 17(9), p.2564 - 2567, 2001/05

https://doi.org/10.1021/la0016423

Times Cited Count：40 Percentile：92.2(Chemistry, Multidisciplinary)

A new type of TiO $_{2}$ nanosheet-organic complex multilayer film was successfully prepared by the Langmuir-Blodgett technique. Surface pressure-area curves demonstrated that a stable monolayer of dioctadecyldimethylammonium bromide (DODAB) was formed on an aqueous suspension of TiO $_{2}$ nanosheets derived from an exfoliated layered titanate, H $_{x}$ Ti $_{2-x/4}$ □ $_{x/4}$ O $_{4}$ ・H $_{2}$ O (x0.7; □, vacancy). The hybrid monolayer of the ammonium amphiphiles and the TiO $_{2}$ nanosheet was quantitatively transferred onto a hydrophobic quartz plate to form a multilayer film. X-ray diffraction measurements confirmed the formation of an ordered structure of DODAB/TiO $_{2}$ with an interlayer distance of 3.4 nm.