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

2005 ◽  
pp. 5226 ◽  
Author(s):  
Syusuke Oosaki ◽  
Hisanobu Hayasaki ◽  
Yoshiaki Sakurai ◽  
Setsuko Yajima ◽  
Keiichi Kimura
Keyword(s):  
Liquid Crystalline ◽  
Ion Sensors ◽  
Neutral Carrier ◽  
Ion Sensor

Neutral Carrier-Type Ion Sensors Based on Sol−Gel-Derived Membranes Incorporating a Bis(crown ether) Derivative by Covalent Bonding

1998 ◽  
Vol 70 (20) ◽  
pp. 4309-4313 ◽  
Author(s):  
Keiichi Kimura ◽  
Takenobu Sunagawa ◽  
Setsuko Yajima ◽  
Saori Miyake ◽  
Masaaki Yokoyama
Keyword(s):  
Crown Ether ◽  
Sol Gel ◽  
Covalent Bonding ◽  
Ion Sensors ◽  
Neutral Carrier ◽  
Ether Derivative

Calix[4]arene Derivative Bearing π-Coordinate Substituents as Neutral Carrier for Silver Ion Sensors

1998 ◽  
Vol 27 (8) ◽  
pp. 833-834 ◽  
Author(s):  
Keiichi Kimura ◽  
Kenta Tatsumi ◽  
Setsuko Yajima ◽  
Saori Miyake ◽  
Hidefumi Sakamoto ◽  
...  
Keyword(s):  
Silver Ion ◽  
Ion Sensors ◽  
Arene Derivative ◽  
Neutral Carrier

scholarly journals Special Issue “Advances in Artificial and Biological Membranes: Mechanisms of Ionic Sensitivity, Ion-Sensor Designs, and Applications for Ion Measurement”

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 427
Author(s):  
Andrzej Lewenstam ◽  
Krzysztof Dołowy
Keyword(s):  
Biological Membranes ◽  
Membrane Electrodes ◽  
Special Issue ◽  
Ion Sensors ◽  
Ion Sensor ◽  
Glass Membrane ◽  
Selective Membrane ◽  
Ph Electrode

Ion sensors, conventionally known as ion-selective membrane electrodes, were devised 100 years ago with the invention of a pH electrode with a glass membrane (in 1906 Cremer, in 1909 Haber and Klemensiewicz) [...]

Chemical modification of sol-gel-derived glass by a neutral carrier for ion sensors

1996 ◽  
pp. 745 ◽  
Author(s):  
Keiichi Kimura ◽  
Takenobu Sunagawa ◽  
Masaaki Yokoyama
Keyword(s):  
Chemical Modification ◽  
Sol Gel ◽  
Ion Sensors ◽  
Neutral Carrier

Freeze fracture imaging and computer simulation of liposome structure: Membrane geometry and defects

1983 ◽  
Vol 41 ◽  
pp. 646-647
Author(s):  
Joseph A. Zasadzinski
Keyword(s):  
Liquid Crystalline ◽  
Freeze Fracture ◽  
Continuum Theory ◽  
Closed Surfaces ◽  
Straight Line ◽  
Low Weight ◽  
Concentric Spheres ◽  
Membrane Geometry ◽  
Dupin Cyclides ◽  
Limiting Case

At low weight fractions, many surfactant and biological amphiphiles form dispersions of lamellar liquid crystalline liposomes in water. Amphiphile molecules tend to align themselves in parallel bilayers which are free to bend. Bilayers must form closed surfaces to separate hydrophobic and hydrophilic domains completely. Continuum theory of liquid crystals requires that the constant spacing of bilayer surfaces be maintained except at singularities of no more than line extent. Maxwell demonstrated that only two types of closed surfaces can satisfy this constraint: concentric spheres and Dupin cyclides. Dupin cyclides (Figure 1) are parallel closed surfaces which have a conjugate ellipse (r1) and hyperbola (r2) as singularities in the bilayer spacing. Any straight line drawn from a point on the ellipse to a point on the hyperbola is normal to every surface it intersects (broken lines in Figure 1). A simple example, and limiting case, is a family of concentric tori (Figure 1b).To distinguish between the allowable arrangements, freeze fracture TEM micrographs of representative biological (L-α phosphotidylcholine: L-α PC) and surfactant (sodium heptylnonyl benzenesulfonate: SHBS)liposomes are compared to mathematically derived sections of Dupin cyclides and concentric spheres.

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