ChemInform Abstract: Photosensitive Polymeric Amphiphiles: Irradiation-Induced Structural Changes in Langmuir-Blodgett Multilayers.

ChemInform ◽  
2010 ◽  
Vol 22 (16) ◽  
pp. no-no
Author(s):  
T. ARNDT ◽  
L. HAEUSSLING ◽  
H. RINGSDORF ◽  
G. WEGNER
Keyword(s):  
Structural Changes ◽  
Langmuir Blodgett ◽  
Polymeric Amphiphiles

Photosensitive polymeric amphiphiles: Irradiation-induced structural changes in langmuir-blodgett multilayers

1991 ◽  
Vol 3 (1) ◽  
pp. 58-63 ◽  
Author(s):  
Thomas Arndt ◽  
Lukas Häußling ◽  
Helmut Ringsdorf ◽  
Gerhard Wegner
Keyword(s):  
Structural Changes ◽  
Langmuir Blodgett ◽  
Polymeric Amphiphiles

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.

New Strategies for Preparing Electrically Conductive Langmuir-Blodgett Films

1992 ◽  
Vol 247 ◽  
Author(s):  
J. H. Cheung ◽  
R. B. Rosner ◽  
M. F. Rubner
Keyword(s):  
Electrical Properties ◽  
Stearic Acid ◽  
Structural Changes ◽  
Solid State Reactions ◽  
Emeraldine Base ◽  
Structure Property ◽  
Electrically Conductive ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

ABSTRACTThe fabrication, structure and electrical properties of new electrically conductive Langmuir-Blodgett (LB) films of polyaniline and polypyrrole have been investigated. Polyaniline in its emeraldine-base form was mixed with stearic acid (PAN-B/SA) to produce stable films at the air-water interface (5/1 or 10/1 mole ratio of PAN-B/SA). These films were then transferred into multilayer films which were found to exhibit conductivities of about 1 S/cm upon doping with hydrochloric acid. The alkyl chains of the stearic acid molecules were found to be distributed randomly throughout the LB film thereby exerting a minimal influence on the electrical properties of the polyaniline phase. In addition to this mixed monolayer approach, a novel method of fabricating highly conductive polypyrrole LB films has been developed. This method is based on the sequential exposure of ferric stéarate LB films to hydrogen chloride (HC1) gas and pyrrole vapor. Each of these two solid state reactions was found to impart dramatic chemical and structural changes to the film. Polypyrrole LB films with conductivities as high as 5 S/cm were produced via this process. The electrical and optical properties of films made by both techniques were examined in order to elucidate their structure/property relationships.

Structural changes in molecular assemblies in Langmuir-Blodgett films induced by ionizing radiation

1996 ◽  
Vol 283 (1-2) ◽  
pp. 124-129 ◽  
Author(s):  
K Asai ◽  
T Watanabe ◽  
D Hiroishi ◽  
T Sato ◽  
K Ishigure
Keyword(s):  
Ionizing Radiation ◽  
Structural Changes ◽  
Molecular Assemblies ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

Structural changes in the model of the outer cell membrane of Gram-negative bacteria interacting with melittin: An in situ spectroelectrochemical study

2020 ◽  
Author(s):  
Izabella Brand ◽  
Bishoy Khairalla
Keyword(s):  
Cell Membrane ◽  
Structural Changes ◽  
Supramolecular Assembly ◽  
Outer Cell ◽  
Gram Negative Bacteria ◽  
Gram Negative ◽  
Langmuir Blodgett ◽  
A Cell ◽  
Experimental Challenge

A cell membrane of Gram-negative bacteria interacting with an antimicrobial peptide represents a complex supramolecular assembly. Fabrication of the models of bacterial cell membranes remains a large experimental challenge. Langmuir-Blodgett...

Neutron reflectivity study of structural changes in barium stearate Langmuir—Blodgett films during annealing

1996 ◽  
Vol 221 (1-4) ◽  
pp. 185-191 ◽  
Author(s):  
L. Feigin ◽  
O. Konovalov ◽  
D.G. Wiesler ◽  
C.F. Majkrzak ◽  
T. Berzina ◽  
...  
Keyword(s):  
Structural Changes ◽  
Neutron Reflectivity ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Barium Stearate

Structural Changes in Mixed Langmuir−Blodgett Films upon Nanoparticle Formation

Langmuir ◽  
2002 ◽  
Vol 18 (16) ◽  
pp. 6391-6397 ◽  
Author(s):  
Benjamin M. D. O'Driscol ◽  
Ian R. Gentle
Keyword(s):  
Structural Changes ◽  
Nanoparticle Formation ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

Oriented films from polymeric amphiphiles with mesogenic groups: Langmuir-Blodgett liquid crystals?

1991 ◽  
Vol 24 (5) ◽  
pp. 1041-1049 ◽  
Author(s):  
Thomas L. Penner ◽  
Jay S. Schildkraut ◽  
Helmut Ringsdorf ◽  
Andreas Schuster
Keyword(s):  
Liquid Crystals ◽  
Langmuir Blodgett ◽  
Oriented Films ◽  
Polymeric Amphiphiles

Structural changes before and during desorption of Langmuir-Blodgett films

Langmuir ◽  
1991 ◽  
Vol 7 (10) ◽  
pp. 2298-2302 ◽  
Author(s):  
P. Tippmann-Krayer ◽  
H. Moehwald ◽  
Yu. M. L'vov
Keyword(s):  
Structural Changes ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films
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