Nanostructured LB films developed from poly(p-acryloylaminophenylmethylphosphonic) acid

ABSTRACTIn this paper, the formation of Langmuir-Blodgett films of poly(p-acryloylaminophenylmethylphosphonic) acid polymers, with general formula (C10H12NPO4)n are reported. The Langmuir-Blodgett (LB) technique was used for building ordered nanostructures in molecular assemblies of these polymers, which were able to form stable films. At the air-water interface, these polymers (with low and high molecular weight) formed Langmuir (L) monolayers, which were characterized by surface pressure versus molecular area (π-A) isotherms and Brewster´s Angle Microscopy (BAM). Using the LB method, molecular mono and multilayer films of these polymers were prepared and transferred onto glass substrates forming Z-type multilayers, with a transfer ratio close to unity. These LB films were characterized by Atomic Force Microscopy (AFM).

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Structural and Morphological Characterization of Ultrathin Films of an Asymmetric Polydiacetylene

MRS Proceedings ◽

10.1557/proc-440-221 ◽

1996 ◽

Vol 440 ◽

Cited By ~ 3

Author(s):

H. C. Wang ◽

D. W. Cheong ◽

J. Kumar ◽

C. Sung ◽

S. K. Tripathy

Keyword(s):

Second Harmonic ◽

Morphological Characterization ◽

Lb Films ◽

Force Microscopy ◽

Langmuir Blodgett ◽

Glass Substrates ◽

Atomic Force ◽

Transmission Electron ◽

Air Water Interface

AbstractA soluble, asymmetrically substituted polydiacetylene, poly(BPOD), has been reported to form stable monolayers at the air-water interface by the Langmuir-Blodgett (LB) technique [2]. Preformed polydiacetylene has been deposited onto hydrophobic substrates as multilayers to form second order nonlinear optical thin films. Second harmonic generation was found to increase with the number of layers. From previous atomic force microscopy (AFM) studies backbone orientation along the dipping direction with an interchain spacing of about 5 A° was indicated [2].The film morphology and preferential molecular orientation of these LB films are further investigated by transmission electron microscopy (TEM). A specifically tailored sample preparation method for the ultrathin LB films was used. Multilayer films were deposited on hydrophobic collodion covered glass substrates for this purpose. Electron diffraction was employed to study the crystalline organization of mono and multilayers of LB films as well as cast films.

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Nanostructured LB Films Developed from Ferrocenylthioamide and Ferrocenylselenoamide Compounds

MRS Proceedings ◽

10.1557/opl.2014.160 ◽

2014 ◽

Vol 1613 ◽

pp. 67-72

Author(s):

Rosa E. Lazo-Jiménez ◽

María C. Ortega-Alfaro ◽

José G. López- Cortés ◽

José A. Chávez-Carvayar ◽

Jordi Ignés-Mullol ◽

...

Keyword(s):

Lb Films ◽

Force Microscopy ◽

Langmuir Blodgett ◽

Glass Substrates ◽

Molecular Monolayers ◽

Atomic Force ◽

Pharmacological Interest ◽

Air Water Interface ◽

Conjugated Compounds ◽

Donor Moiety

ABSTRACTIn this work, the synthesis of two amphiphilic π-conjugated compounds such as ferrocenylthioamide and ferrocenylselenoamide, with the general formula FcC=MNH(CH2)15CH3 with M = S or Se, are reported. The ferrocenyl group is a donor moiety forming a π-conjugated system with the amides of sulfur and selenium; both elements have also bioactivity with pharmacological interest. These two compounds formed Langmuir (L) monolayers at the air-water interface, which were characterized by isotherms of surface pressure versus molecular area (π-A) and compression/expansion cycles (hysteresis curves); Brewster angle microscopic images were also obtained. By using the Langmuir-Blodgett method molecular monolayers were transferred onto glass substrates. These nanostructures, in form of Langmuir-Blodgett (LB) films, were characterized through atomic force microscopy (AFM).

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Langmuir-Blodgett Films of Calcium Stearate

MRS Proceedings ◽

10.1557/proc-351-97 ◽

1994 ◽

Vol 351 ◽

Cited By ~ 1

Author(s):

Necesio Costa ◽

Mark Aindow ◽

Peter M. Marquis

Keyword(s):

Film Surface ◽

Organic Matrix ◽

Calcium Stearate ◽

Contact Mode ◽

Lb Films ◽

Force Microscopy ◽

Langmuir Blodgett ◽

Atomic Force ◽

A Value ◽

Langmuir Blodgett Films

ABSTRACTThe Langmuir Blodgett (LB) Process has been shown to be an appropriate method for use in mimicking of biological processes for producing engineering materials such as bioceramics. The main advantages of this approach are that the layers form at low temperatures, that they are fully dense and that the process of densification is by infiltration rather than by sintering. Moreover, biological hard tissues are self-assembled to perform certain functions; the architecture being controlled by an epitaxial organic matrix. Clearly, if this process can be understood in detail then it is possible that LB films may be used to replicate this architecture for engineering purposes.Atomic Force Microscopy (AFM) and X-ray diffraction (XRD) have been used to study and characterise LB films of calcium stearate obtained by the repeated dipping into and withdrawal of a (001) Si wafer from a subphase containing calcium ions and using stearic acid as the surfactant. Contact-mode AFM images of the film surface have been used to measure the thickness of the LB layers and to reveal the nature and distribution of defects in the film. The measured thickness of the calcium stearate layers is about 2.5 nm; a value consistent with that obtained by XRD, but smaller than the length of an individual calcium stearate molecules.

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Phase Transitions in Phospholipid Monolayers Studied by Atomic Force Microscopy and Langmuir-Blodgett Technique

Revista de Chimie ◽

10.37358/rc.08.11.2008 ◽

2008 ◽

Vol 59 (11) ◽

Author(s):

Maria Tomoaia-Cotisel ◽

Aurora Mocanu

Keyword(s):

Atomic Force Microscopy ◽

Lipid Membrane ◽

Phase Behaviour ◽

Membrane Interface ◽

Force Microscopy ◽

Langmuir Blodgett ◽

Atomic Force ◽

Phospholipid Monolayers ◽

Air Water Interface ◽

Condensed Liquid

The phase behaviour and surface structure of dipalmitoyl phosphatidyl choline (DPPC) monolayers at the air/water interface, in the absence and the presence of procaine, have been investigated by Langmuir-Blodgett (LB) technique and atomic force microscopy. The LB films were transferred on mica, at a controlled surface pressure, characteristic for the expanded liquid to condensed liquid phase transition of pure DPPC monolayers. The results indicate that procaine penetrates into and specifically interacts with phospholipid monolayers stabilizing the lipid membrane interface.

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