Clay-modified electrodes prepared by the Langmuir-Blodgett method

Clay Minerals ◽  
1997 ◽  
Vol 32 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Y. Hotta ◽  
M. Taniguchi ◽  
K. Inukai ◽  
A. Yamagishi
Keyword(s):  
Thin Film ◽  
Water Surface ◽  
Modified Electrodes ◽  
Double Layers ◽  
Carbon Substrate ◽  
Cyclic Voltammogram ◽  
Water Interface ◽  
Langmuir Blodgett ◽  
Air Water Interface ◽  
Glassy Carbon Substrate

AbstractAn ion-exchange adduct of saponite with tetra-n-decylammonium cation ((n-decyl)4N+) was prepared and dispersed in chloroform. The material was spread on a water surface to form a thin film at the air-water interface. From the measurements of surface pressure vs. area, it was concluded that the film consisted of the very thin layer which was a mixture of single and double layers of saponite adduct. A clay-modified electrode was prepared by depositing the film on a glassy carbon substrate using the Langmuir-Blodgett method. When the electrode was soaked in an aqueous solution of [Fe(phen)3](ClO4)2 (phen = 1,10-phenanthroline), (n-decyl)4N+ cations were replaced by [Fe(phen)3]2+ ions from solution. This process was followed by measuring the cyclic voltammogram.

Chlorophyll a–violaxanthin interactions in monolayers at air–water interface and in Langmuir–Blodgett films

2000 ◽  
Vol 19 (2) ◽  
pp. 117-125 ◽  
Author(s):  
Wieslaw I Gruszecki ◽  
Bogumil Zelent ◽  
Heidar-Ali Tajmir-Riahi ◽  
Gongming Wang ◽  
Toufik Taleb ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Water Interface ◽  
Langmuir Blodgett ◽  
Air Water Interface ◽  
Langmuir Blodgett Films

Metastability in Monolayer Films Transferred onto Solid Substrates by the Langmuir-Blodgett Method: IR Evidence for Transfer-Induced Phase Transitions

1994 ◽  
Vol 48 (10) ◽  
pp. 1196-1203 ◽  
Author(s):  
Fazale R. Rana ◽  
Suci Widayati ◽  
Brian W. Gregory ◽  
Richard A. Dluhy
Keyword(s):  
Fatty Acid ◽  
Conformational Changes ◽  
Structural Changes ◽  
High Surface ◽  
Solid Substrate ◽  
Water Interface ◽  
Monolayer Films ◽  
Langmuir Blodgett ◽  
Monomolecular Film ◽  
Air Water Interface

The rate at which a monomolecular film is deposited onto a solid substrate in the Langmuir-Blodgett process of preparing supported monolayer films influences the final structure of the transferred film. Attenuated total reflectance infrared spectroscopic studies of monolayers transferred to germanium substrates show that the speed at which the substrate is drawn through the air/water interface influences the final conformation in the hydrocarbon chains of amphiphilic film molecules. This transfer-induced effect is especially evident when the monolayer is transferred from the expanded region of surface-pressure-molecular-area isotherms at low surface pressures; the effect is minimized when the film molecules are transferred from condensed phases at high surface pressures. This phenomenon has been observed for both a fatty acid and a phospholipid, which suggests that these conformational changes may occur in a variety of hydrocarbon amphiphiles transferred from the air/water interface. This conformational ordering may be due to a kinetically limited phase transition taking place in the meniscus formed between the solid substrate and aqueous subphase. In addition, the results obtained for both the phospholipid and fatty acid suggest that the structure of the amphiphile may help determine the extent and nature of the transfer-speed-induced structural changes taking place in the monomolecular film.

BEHAVIOR OF METHYLENE BLUE WITH ARACHIDIC ACID IN THE RESTRICTED GEOMETRY OF LANGMUIR–BLODGETT FILM

2014 ◽  
Vol 21 (02) ◽  
pp. 1450030
Author(s):  
INDRA GHOSH ◽  
AJITESH PAL ◽  
JAYASREE NATH ◽  
BIJAY KUMAR MISHRA ◽  
RANENDU KUMAR NATH
Keyword(s):  
Methylene Blue ◽  
Quartz Substrate ◽  
Arachidic Acid ◽  
Layer By Layer ◽  
Water Interface ◽  
Restricted Geometry ◽  
Langmuir Blodgett ◽  
Isotherm Study ◽  
Air Water Interface ◽  
Interaction Kinetics

Anti-malarial methylene blue (MB) doped in arachidic acid (AA) have been incorporated in the Langmuir monolayer at the air–water interface and also in the Langmuir–Blodgett films deposited on quartz substrate. The pressure–area (π–A) isotherm studies at different concentrations of MB pointed out that pure MB could not form stable monolayer at the air–water interface and collapse readily at very low surface pressures. However, mixture of MB with AA formed stable monolayers and they could be transferred into solid quartz substrate to form mono/multi layered films of MB. The area per molecule of floating mixed monolayers was systematically decreased with the increasing concentrations of MB in the mixture. The pressure–time (π - t) isotherm study indicated the interaction kinetics between MB and AA. Higher the concentration of MB, higher is the increase in pressure. The spectroscopic characteristics of the mixed LB films have been compared with that of pure MB solution, microcrystal and layer-by-layer self assembled film with UV-Vis absorption spectroscopy. Surface morphology of the mixed LB and LbL film of MB was measured with atomic force microscopy (AFM).

scholarly journals Thin-film behavior of poly(methyl methacrylates). 1. Monolayers at the air-water interface

1991 ◽  
Vol 24 (7) ◽  
pp. 1487-1495 ◽  
Author(s):  
R. H. G. Brinkhuis ◽  
A. J. Schouten
Keyword(s):  
Thin Film ◽  
Water Interface ◽  
Air Water Interface ◽  
Methyl Methacrylates

Assembly of Phase Transferred Nickel Nanoparticles at Air–Water Interface Using Langmuir-Blodgett Technique

2006 ◽  
Vol 6 (12) ◽  
pp. 3736-3745 ◽  
Author(s):  
Tanushree Bala ◽  
Bhagyashree Joshi ◽  
Neelima Iyer ◽  
Murali Sastry ◽  
B. L. V. Prasad
Keyword(s):  
Nickel Nanoparticles ◽  
Water Interface ◽  
Langmuir Blodgett ◽  
Air Water Interface

Unified Molecular View of the Air/Water Interface Based on Experimental and Theoretical χ(2)Spectra of an Isotopically Diluted Water Surface

2011 ◽  
Vol 133 (42) ◽  
pp. 16875-16880 ◽  
Author(s):  
Satoshi Nihonyanagi ◽  
Tatsuya Ishiyama ◽  
Touk-kwan Lee ◽  
Shoichi Yamaguchi ◽  
Mischa Bonn ◽  
...  
Keyword(s):  
Water Surface ◽  
Water Interface ◽  
Air Water Interface
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