Faculty Profiles - YAJIMA Setsuko

Published Papers - YAJIMA Setsuko

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Erratum: Comparison of physical adsorption strength of protective agents via ligand exchange of silver nanoparticles prepared by vacuum evaporation on running oil substrate (Bulletin of the Chemical Society of Japan (2017) 90 (1251) DOI: 10.1246/bcsj.20170189)

Takashi Ienaga, Soichiro Okada, Yoshio Nakahara, Mitsuru Watanabe, Toshiyuki Tamai, Setsuko Yajima, Keiichi Kimura

Bulletin of the Chemical Society of Japan ( Chemical Society of Japan ) 90 ( 11 ) 1251 - 1258 2018 [Refereed]

We compared adsorption strength of protective agents via ligand exchange of silver nanoparticles synthesized by the improved vacuum evaporation on running oil substrate (VEROS) method. This comparison concerns physical adsorption of protective agents on the surface of silver nanoparticles instead of chemisorption. Clean surfaces of silver nanoparticles synthesized by the improved VEROS method were suitable for this investigation. All the experiments in this study were designed so that as far as possible protective agents did not ionize. Thus, oleic acid capped silver nanoparticles were synthesized by the improved VEROS method. Next, octanoic acid, n-octylamine and oleic acid were used as additive protective agents in ligand exchanges. The ligand exchange is also closely related to physical adsorption strength of protective agents on the surface of metal nanoparticles. Oleic acid on the surface of silver nanoparticles was exchanged by octanoic acid and vice versa under the same experimental conditions. On the other hand, oleic acid on the silver surface was not exchanged by n-octylamine. These results were remarkably different from those reported in general chemical synthetic methods but they were well consistent with our previous study on performance of protective agents in the synthesis of silver nanoparticles with the improved VEROS method.

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Development of Ion Sensors Based on Polysilsesquioxane Modified Chemically with Crown Ether Derivatives in View of in vivo Analyses

Setsuko Yajima, Masato Kishi, Keiichi Kimura （Part： Lead author,　Corresponding author )

BUNSEKI KAGAKU ( JAPAN SOC ANALYTICAL CHEMISTRY ) 66 ( 6 ) 431 - 436 2017.06 [Refereed]

We used polysilsesquioxanes (PSQ), which are inorganic-organic composites, as ion-sensing membrane materials of ion sensors. In this study, PSQ-bearing methyl and vinyl groups at a ratio of 4 : 1 were modified chemically with crown ether derivatives. The membranes were formed from solutions of these compounds on the gates of ion-sensitive field-effect transistors, and used as ion-sensing membranes. The ion-sensor properties of these membranes were investigated at 25 degrees C. Ion-sensing membranes based on these PSQ responded to K+. In the case of PSQ chemically immobilized with 18-crown-6, the Nernstian response for K+ activity changes was obtained, and the K+ selectivity of the membrane was similar to that of the conventional 18-crown-6 derivative based ion-sensing membranes. In addition, the adsorption of fibrinogen on PSQ derivatives were highly suppressed; it was therefore suggested that the membranes based on PSQ showed good biocompatibility.

Surface modification of PEN and PET substrates by plasma treatment and layer-by-layer assembly of polyelectrolyte multilayer thin films and their application in electroless deposition

T. Tamai, M. Watanabe, Y. Kobayashi, Y. Nakahara, S. Yajima

RSC ADVANCES ( ROYAL SOC CHEMISTRY ) 7 ( 53 ) 33155 - 33161 2017 [Refereed]

The surfaces of the polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) substrates were modified by plasma treatment and then layer-by-layer (LbL) assembly of polyelectrolyte multilayer thin films from two oppositely charged polyelectrolytes. Negatively or positively charged palladium complex ions bound to oppositely charged multilayer surfaces and were reduced to form palladium nanoparticles and then a nickel film was electrolessly deposited on the substrate surfaces. The multilayers on PEN and PET substrate surfaces are suitable for supporting palladium nanoparticle catalysts and their properties can be controlled by the conditions of LbL assembly.

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生体試料のイオン定量のためのオリゴエチレングリコール誘導体化学修飾ゾル-ゲル感応膜の開発

石垣裕真, 矢嶋摂子, 田中睦生, 木村恵一

日本分析化学会講演要旨集 ( (公社)日本分析化学会 ) 64年会 213 - 213 2015.08

Sol-gel transition of organogels observed by terahertz spectroscopy

Hiromichi Hoshina, Atsumi Ozaki, Yusuke Itagaki, Setsuko Yajima, Hal Suzuki, Shinya Ishii, Misaki Ishida, Tetsuji Uchiyama, Keiichi Kimura, Chiko Otani

CHEMICAL PHYSICS LETTERS ( ELSEVIER SCIENCE BV ) 608 173 - 176 2014.07

Terahertz (THz) absorption spectra of organogels consisting of (1R,2R)-1,2-bis(dodecanoylamino) cyclohexane/2-nitrophenyl octyl ether (RR-BDC/NPOE) and RR-BDC/n-dodecane were measured by Fourier-transform far-infrared (FT-FIR) spectroscopy. The vibrational peaks of the gels were observed at the same frequencies as those of the pure gelator, suggesting that the intermolecular structure around the N-H center dot center dot center dot O=C hydrogen bond is maintained in the gel phase. Temperature-dependent spectroscopy showed a drastic spectral change at the sol-gel transition temperature, in which the vibrational peak at 3.5 THz disappears and a new peak appears at 2.9 THz. The change in THz vibrational frequency is indicative of the structural collapse of the hydrogen-bonded fibrous architecture in the sol phase. (C) 2014 Elsevier B.V. All rights reserved.

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アミド基を有する低分子ゲル化剤を用いるイオンセンサーの性能評価とゲル化膜の分光学的検討

尾崎温美, 高見健人, 矢嶋摂子, 保科宏道, 鈴木晴, 石井伸弥, 大谷知行, 木村恵一

日本分析化学会講演要旨集 ( (公社)日本分析化学会 ) 62年会 167 - 167 2013.08

Sol-Gel Transition of Supramolecular Gels Observed by Terahertz SpectroscopyA

Hiromichi Hoshina, Atsumi Ozaki, Yusuke Itagaki, Setsuko Yajima, Hal Suzuki, Shinya Ishii, Misaki Ishida, Tetsuji Uchiyama, Keiichi Kimura, Chiko Otani

2013 38TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) ( IEEE ) 2013

Chloride Ion Sensor Based on Sol-Gel-Derived Membranes Modified Chemically with Porphyrin-Manganese(III) Complexes

Setsuko Yajima, Hiromasa Ishigaki, Yusuke Hori, Rei Takeaki, Keiichi Kimura

BUNSEKI KAGAKU ( JAPAN SOC ANALYTICAL CHEMISTRY ) 61 ( 3 ) 207 - 212 2012.03 [Refereed]

Porphyrin-manganese(III) complexes were used as Cl--selective ionophores for sol-gel derived membranes encapsulating and binding covalently them. The ion-sensing membrane encapsulating the ionophore showed hardly any EMF response to Cl--activity changes, probably because the ionophore was not uniformly dispersed in the sol-gel-derived membranes. On the other hand, the ion-sensing membrane binding covalently the ionophore, in which the ionophore was dispersed in the membranes uniformly, showed near-Nernstian responses to Cl--activity changes. The sol-gel-derived membranes were relatively Cl--selective over interfering hydrophobic anions, as compared with the case of the membranes containing only a cationic additive. The Cl--selective electrode is, therefore, promising for applications to clinical analysis in the future.

Remarkable potassium selectivity of ion sensors based on supramolecular gel membranes made from low-molecular-weight gelators without any ionophore

Setsuko Yajima, Kento Takami, Ryosuke Ooue, Keiichi Kimura

ANALYST ( ROYAL SOC CHEMISTRY ) 136 ( 24 ) 5131 - 5133 2011 [Refereed]

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Drastic selectivity reversal on crown-ether based ion-sensing membranes made of ordered mesoporous silica and conventional sol-gel derived one

Setsuko Yajima, Takahito Nakajima, Mariko Higashi, Keiichi Kimura

Chemical Communications 46 ( 11 ) 1914 - 1916 2010

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Neutral carrier-type Ca2+sensors based on sol-gel-derived membranes incorporating diether-amide derivatives

Setsuko Yajima, Sachie Uchida, Yusuke Hori, Keiichi Kimura

SUPRAMOLECULAR CHEMISTRY ( TAYLOR & FRANCIS LTD ) 22 ( 7-8 ) 420 - 424 2010

We have synthesised Ca2+-selective neutral carriers for sol-gel-derived membranes encapsulating and covalently binding them. These ion-sensing membranes showed excellent EMF responses to Ca2+ activity changes with very short response times. Especially, the membranes covalently binding the neutral carriers did not deteriorate for at least 2 months. These sol-gel-derived membranes were selective for Ca2+ over Na+ and K+. The Ca2+-selective electrode is, therefore, promising for applications to clinical analysis in future.

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Selectivity enhancement in neutral-carrier-type ion sensors based on a liquid-crystalline polymer

Shusuke Osaki, Setsuko Yajima, Keiichi Kimura

ANALYST ( ROYAL SOC CHEMISTRY ) 134 ( 7 ) 1472 - 1476 2009

A liquid-crystalline polymer was applied to a neutral-carrier-type ion sensor as a membrane material for enhancement of ion selectivity. An ion-sensitive field-effect transistor (ISFET) based on the membranes containing the polymer showed high sensitivity and selectivity for K(+) by adding a low-molecular-weight liquid crystal as the plasticizer. The ion-sensor properties of the ISFETs based on the membranes containing a liquid-crystalline polymer were similar to those of the corresponding ion-selective electrodes (ISEs) based on the same polymer. The ion sensor with a liquid-crystalline polymer was more durable than that without any liquid-crystalline polymer. The use of liquid-crystalline polymer as the membrane material improves not only the ion-sensor properties but also the durability.

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Addition effect of ionic liquid to neutral-carrier-type lithium-ion sensing membranes

Ryosuke Ooue, Syusukc Oosaki, Setsuko Yajima, Keiichi Kimura

BUNSEKI KAGAKU ( JAPAN SOC ANALYTICAL CHEMISTRY ) 57 ( 8 ) 619 - 624 2008.08 [Refereed]

Plasticized poly(vinyl chloride) membranes containing an ionic liquid as the membrane solvent were prepared, and the ion-sensor properties of the ISEs were studied. When the ratio of ionic liquids to NPOE was less than 1, the ISEs showed near-Nernstian responses. However, as the ratio became higher than 1, the slope of the EMF responses became smaller. The selectivity for lithium ion was enhanced by the addition of ionic liquid into the membranes, when a polyether-amide derivative was used as the neutral carrier (lithium ionophore).

Addition effect of ionic liquid to neutral-carrier-type lithium-ion sensing membranes

Ryosuke Ooue, Syusuke Oosaki, Setsuko Yajima, Keiichi Kimura

Bunseki Kagaku 57 ( 8 ) 619 - 624 2008

Plasticized poly(vinyl chloride) membranes containing an ionic liquid as the membrane solvent were prepared, and the ion-sensor properties of the ISEs were studied. When the ratio of ionic liquids to NPOE was less than 1, the ISEs showed near-Nernstian responses. However, as the ratio became higher than 1, the slope of the EMF responses became smaller. The selectivity for lithium ion was enhanced by the addition of ionic liquid into the membranes, when a polyetheramide derivative was used as the neutral carrier (lithium ionophore). © 2008 The Japan Society for Analytical Chemistry.

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Strong molecular aggregation of neutral carriers bearing perfluoroalkyl chains in liquid-crystalline ion-sensor membranes

Shusuke Oosaki, Setsuko Yajima, Keiichi Kimura

Analytical Sciences 23 ( 8 ) 963 - 967 2007.08

A liquid-crystalline benzocrown ether, 4′-[(4″-1,1,2,2- tetrahydroperfluorooctyloxy)biphenyloxycarbonyl]benzo-15-crown-5, was used as a neutral carrier of ion-selective electrodes (ISEs) to elucidate the effect of highly ordered assembling of the neutral carrier on the sensor properties through fluorophilic interactions. The properties for the membrane and the resulting ISEs based on a benzocrown ether bearing a perfluoroalkyl chain were compared with those based on the corresponding crown ether bearing an alkyl chain. Atomic force microscopy and fluorescence measurements suggested that the neutral carrier bearing a perfluoroalkyl chain formed highly aggregational states in the membranes of ISEs. 2007 © The Japan Society for Analytical Chemistry.

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Silver-ion redox sensing based on colloid formation by gallate ester derivatives

S Yajima, Y Iwane, E Nomura, H Taniguchi, K Kimura

ANALYTICA CHIMICA ACTA ( ELSEVIER SCIENCE BV ) 556 ( 1 ) 189 - 194 2006.01

Plasmon absorption of silver colloid, which was formed by reduction of silver ion with compounds bearing gallate ester groups in ethanol, was observed by absorption spectroscopy. The time-dependent absorption of silver colloid was found, which shows that the silver colloid is unstable and easy to aggregate. It seemed that a calixarene derivative bearing two gallate ester groups was the most suitable for determining silver ion. In order to prevent the silver colloid aggregation, poly(N-vinylpyrrolidone) (PVP) was added into the solution at a constant time after the preparation of sample solutions. In the calibration graph, the absorbance increased with increasing silver ion concentration, especially in the concentration range of 2.00 x 10(-6) to 1.00 x 10(-5) M. It is possible to determine silver ion concentrations using this method. (c) 2005 Elsevier B.V. All rights reserved.

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Observation of Blood Protein Adsorption on Biocompatible Ion-sensing Membrane Materials by Quartz Crystal Microbalance

S. Yajima, M. Shiraya, K. Kimura

Chemia Analityczna (Chemical Analysis) 51 939 - 947 2006

Metal colloid formation by calix[4]arene gallate ester for silver-ion determination

Y Iwane, S Yajima, E Nomura, H Taniguchi, K Kimura

BUNSEKI KAGAKU ( JAPAN SOC ANALYTICAL CHEMISTRY ) 54 ( 6 ) 527 - 531 2005.06 [Refereed]

The surface plasmon absorption of silver colloid, which was formed by the reduction of silver ion with a calixarene derivative bearing a gallate ester group in ethanol, was observed by absorption spectroscopy. The time-dependent absorption of silver colloid was found, which shows that the silver colloid is unstable and easy to aggregate. In order to prevent the silver colloid aggregation, poly (N-vinylpirrolidone) (PVP) was added into the solution at a constant time after preparing of sample solutions. The addition of PVP was effective for the stabilization of silver colloid, and the absorbance change with time was depressed. In the calibration graph, the absorbance increased with increasing silver-ion concentration, especially in the concentration range of 2.00 x 10(-6)similar to 1.00 X 10(-5) M. It is feasible to determine silver-ion concentrations using this method.

Metal colloid formation by calix[4]arene gallate ester for silver-ion determination

Yoshie Iwane, Setsuko Yajima, Eisaku Nomura, Hisaji Taniguchi, Keiichi Kimura

Bunseki Kagaku 54 ( 6 ) 527 - 531 2005.06

The surface plasmon absorption of silver colloid, which was formed by the reduction of silver ion with a calixarene derivative bearing a gallate ester group in ethanol, was observed by absorption spectroscopy. The time-dependent absorption of silver colloid was found, which shows that the silver colloid is unstable and easy to aggregate. In order to prevent the silver colloid aggregation, poly(N-vinylpirrolidone) (PVP) was added into the solution at a constant time after preparing of sample solutions. The addition of PVP was effective for the stabilization of silver colloid, and the absorbance change with time was depressed. In the calibration graph, the absorbance increased with increasing silver-ion concentration, especially in the concentration range of 2.00 × 10-6-1.00 × 10-5 M. It is feasible to determine silver-ion concentrations using this method. © 2005 The Japan Society for Analytical Chemistry.

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Photocontrol of ion-sensor performances in neutral-carrier-type ion sensors based on liquid-crystalline membranes

S Oosaki, H Hayasaki, Y Sakurai, S Yajima, K Kimura

CHEMICAL COMMUNICATIONS ( ROYAL SOC CHEMISTRY ) ( 41 ) 5226 - 5227 2005 [Refereed]

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Published Papers - YAJIMA Setsuko