scholarly journals Langmuir-Blodgett Films of Supported Polyester Dendrimers

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Rocío Redón ◽  
M. Pilar Carreón-Castro ◽  
F. J. Mendoza-Martínez
Keyword(s):  
Surface Pressure ◽  
Dendritic Structure ◽  
The Self ◽  
Langmuir Films ◽  
Interfacial Behavior ◽  
Brewster Angle Microscopy ◽  
Molecular Area ◽  
Langmuir Blodgett ◽  
Self Assembling ◽  
Langmuir Blodgett Films

Amphiphiles with a dendritic structure are attractive materials as they combine the features of dendrimers with the self-assembling properties and interfacial behavior of water-air affinities. We have synthesized three generations of polyester dendrimers and studied their interfacial properties on the Langmuir films. The behavior obtained was, as a rule, the lowest generation dendrimers behaving like traditional amphiphiles and the larger molecules presenting complicated isotherms. The Langmuir films of these compounds have been characterized by their surface pressure versus molecular area (π/A) and Brewster angle microscopy (BAM) observations.

Protonation-induced rearrangements in Langmuir films and redox properties of Langmuir–Blodgett films of 2-(n-alkyl)fulleropyrrolidines

2002 ◽  
Vol 130 (3) ◽  
pp. 221-227 ◽  
Author(s):  
Krzysztof Noworyta ◽  
Wlodzimierz Kutner ◽  
Gollapalli R Deviprasad ◽  
Francis D’Souza
Keyword(s):  
Redox Properties ◽  
Langmuir Films ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

Amphiphilic Phenylene−Ethynylene Oligomers in Langmuir−Blodgett Films. Self-Assembling Multilayers for Electroluminescent Devices

Langmuir ◽  
2000 ◽  
Vol 16 (9) ◽  
pp. 4309-4318 ◽  
Author(s):  
E. Arias-Marin ◽  
J. C. Arnault ◽  
D. Guillon ◽  
T. Maillou ◽  
J. Le Moigne ◽  
...  
Keyword(s):  
Phenylene Ethynylene ◽  
Electroluminescent Devices ◽  
Langmuir Blodgett ◽  
Self Assembling ◽  
Langmuir Blodgett Films

Langmuir−Blodgett Films Formed by Continuously Varying Surface Pressure. Characterization by IR Spectroscopy and Epifluorescence Microscopy

Langmuir ◽  
2007 ◽  
Vol 23 (9) ◽  
pp. 4950-4958 ◽  
Author(s):  
Lin Wang ◽  
Antonio Cruz ◽  
Carol R. Flach ◽  
Jesús Pérez-Gil ◽  
Richard Mendelsohn
Keyword(s):  
Ir Spectroscopy ◽  
Surface Pressure ◽  
Epifluorescence Microscopy ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

Surface Pressure Induced Structural Effects in Photosynthetic Reaction Center Langmuir-Blodgett Films

Langmuir ◽  
1998 ◽  
Vol 14 (1) ◽  
pp. 193-198 ◽  
Author(s):  
Paolo Facci ◽  
Victor Erokhin ◽  
Sergio Paddeu ◽  
Claudio Nicolini
Keyword(s):  
Reaction Center ◽  
Surface Pressure ◽  
Photosynthetic Reaction Center ◽  
Structural Effects ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

Elastic anisotropies in 22-tricosenoic acid Langmuir-Blodgett films: surface pressure and dipping direction

1989 ◽  
Vol 1 (23) ◽  
pp. 3663-3669 ◽  
Author(s):  
D G Gleed ◽  
B Hillebrands ◽  
S Lee ◽  
G I Stegeman ◽  
J R Sambles ◽  
...  
Keyword(s):  
Surface Pressure ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

scholarly journals Viscoelasticidade de filmes monomoleculares contendo componentes anfifílicos do petróleo

2020 ◽  
Author(s):  
◽  
Clara Botarelli Kabbach
Keyword(s):  
Surface Pressure ◽  
Transport Processes ◽  
Strong Impact ◽  
Interfacial Rheology ◽  
Compression Tests ◽  
Interfacial Behavior ◽  
Active Components ◽  
Langmuir Blodgett ◽  
Compression And Expansion ◽  
Sara Fractions

Petroleum is a mixture of organic compounds, with a preponderance of hydrocarbons and minor occurrence of heterocompounds. The oil interface-active components are involved in various stages of the production and transport processes. They have a strong impact on the formation and stabilization of emulsions and foams, inversion of wettability and deposition and adhesion of solids on surfaces. Asphaltenes and resins fractions are composed of supramolecular structures with greatest polarity and highest interfacial activity. The present work describes the interfacial behavior of films containing amphiphiles extracted from oil. Specifically, the study reports the behavior of interfacial monolayer containing asphaltenes and maltenes (saturates, aromatics and resins) in petroleum and the monolayer interfacial rheology of each individual fraction. Asphaltenes films were subjected to oscillatory tests carried out in the Langmuir Blodgett trough to analyzing the non-dilatational surface pressure. Films of the SARA fractions were submitted to compression and expansion tests. The results demonstrate that the asphaltene films are influenced by the change in surface pressure and the compression frequency. The frequency sweep tests provided the observation of a slight tendency to decrease the dilatational modulus of elasticity as the frequency increased (from 25 to 250mHz), as well as the decrease in the elastic modulus (from 137.11 to 8.0 mN /m). In general, the viscous behavior of the components is increased with the frequency increasing. The phase behavior for mixtures of asphaltenes and resins shows similarity to the behavior of the asphaltene fraction film. Isothermal compressibility of 0.0095 mN/m to 0.1208 mN/m was obtained in the compression tests and 0.0035 mN/m to 0.0389 mN/m in the expansion tests, corroborating the irreversibility of the monolayers

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