Nanostructured LB Films Developed from Ferrocenylthioamide and Ferrocenylselenoamide Compounds

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).

Structural and Morphological Characterization of Ultrathin Films of an Asymmetric Polydiacetylene

1996 ◽  
Vol 440 ◽  
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.

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

2016 ◽  
Vol 1819 ◽  
Author(s):  
Rosa E. Lazo-Jiménez ◽  
José A. Chávez-Carvayar ◽  
Ana M. Herrera-González ◽  
Valentin Islas-Pérez ◽  
María P. Carreón-Castro
Keyword(s):  
Multilayer Films ◽  
Molecular Area ◽  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Glass Substrates ◽  
Atomic Force ◽  
Air Water Interface ◽  
Langmuir Blodgett Films ◽  
Ordered Nanostructures

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).

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

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.

scholarly journals Growth and Switching of Ferroelectric Nanocrystals from Ultrathin Film of Copolymer of Vinylidene Fluoride and Trifluoroethylene

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
R. Gaynutdinov ◽  
V. Fridkin ◽  
H. Kliem
Keyword(s):  
Self Assembly ◽  
Vinylidene Fluoride ◽  
Paraelectric Phase ◽  
Orthorhombic Space Group ◽  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Storage Media ◽  
Atomic Force ◽  
Kinetics Of

The ferroelectric nanocrystals of the copolymer of vinylidene fluoride and trifluoroethylene P(VDF-TrFE) were grown from ultrathin Langmuir-Blodgett (LB) films on Si substrate. The annealing of ultrathin LB films with thickness of 3 monolayers (5 nm) in air in paraelectric phase at temperature 125∘C was performed. The self-assembly leads to the growth of nanocrystals of ferroelectric copolymer 15–25 nm thick and 100–200 nm in diameter. The nanocrystals presumably belong to orthorhombic space group, where axis 2 is the direction of spontaneous polarization (and normal to substrate). By means of atomic force microscopy (AFM), the kinetics of ferroelectric nanocrystals growth and their switching were investigated. The obtained results confirm the conclusions that copolymer nanocrystals are candidates for high-density nonvolatile storage media devices.

Atomic Force Microscopy (AFM) Investigation of Langmuir-Blodgett (LB) Films of Sugar Cane Bagasse Lignin

Holzforschung ◽  
2000 ◽  
Vol 54 (1) ◽  
pp. 55-60 ◽  
Author(s):  
C. J. L. Constantino ◽  
A. Dhanabalan ◽  
M. A. Cotta ◽  
M. A. Pereira-da-Silva ◽  
A. A. S. Curvelo ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Sugar Cane ◽  
Sugar Cane Bagasse ◽  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Domain Structures ◽  
Atomic Force ◽  
Poor Stability ◽  
Cadmium Stearate

Summary The morphological features of Langmuir-Blodgett (LB) films of pure lignin extracted from sugar cane bagasse and composites of lignin and cadmium stearate have been investigated using atomic force microscopy (AFM). Results indicated that despite the non-amphiphilic nature of lignin and associated relatively poor stability and transferability of the lignin monolayer, the surface of the film is smooth at the micron level and comparable to that of LB films from typical amphiphilic compounds. Distinct domain structures from lignin and cadmium stearate could be visualized in the composite LB film even in one monolayer thick LB films. The mean surface roughness increases with increasing numbers of layers.

Langmuir-Blodgett Films of Calcium Stearate

1994 ◽  
Vol 351 ◽  
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.

Optical changes induced in Zn porphyrin solutions and LB films by exposure to amines

2006 ◽  
Vol 10 (07) ◽  
pp. 978-985 ◽  
Author(s):  
Alan D. F. Dunbar ◽  
Tim H. Richardson ◽  
Alex J. McNaughton ◽  
Ashley Cadby ◽  
Jordan Hutchinson ◽  
...  
Keyword(s):  
Near Field ◽  
Chloroform Solution ◽  
Electron System ◽  
Visible Range ◽  
Material System ◽  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Atomic Force ◽  
Good Material

The 5,10,15,20-tetrakis[3,4-bis(2-ethylhexyloxy)phenyl]-21 H ,23 H -porphinato zinc(II) ( ZnEHO ) is highly stable and exhibits a colorful absorption spectrum in the visible range. Exposure of a chloroform solution of ZnEHO to amines is shown to induce changes in the characteristic optical spectrum owing to charge transfer between the amine and the delocalized π-electron system within the highly conjugated molecule. Solid state Langmuir Blodgett (LB) films containing only ZnEHO are compared to films containing a mixture of ZnEHO and calix[8]arene. The transparent calix[8]arene does not change the optical response but aids the diffusion of the amine gas into the LB films. Atomic force microscopy (AFM) and scanning near-field optical microscopy (SNOM) images demonstrate the topological and compositional differences between the samples. The response of the LB films of ZnEHO and calix[8]arene to a variety of different amines demonstrates that this is a good material system for use as an amine sensor.

The Effect of Globular Protein from Aleurone Cells of Barley on Stearic Acid Monolayers

2017 ◽  
Vol 68 (7) ◽  
pp. 1470-1475
Author(s):  
Ileana Cojocaru ◽  
Andrada Tomoaia Cotisel ◽  
Aurora Mocanu ◽  
Traianos Yupsanis ◽  
Maria Tomoaia Cotisel
Keyword(s):  
Stearic Acid ◽  
Solid Phase ◽  
Globular Protein ◽  
Cell Protein ◽  
Aleurone Cell ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Aleurone Cells ◽  
Atomic Force ◽  
Air Water Interface

Aleurone cells of barley accumulate the major storage globular protein, which is deposited in different patterns, such as protein and lipid self-assemblies. To better understand the complexity of storage self-assemblies, a fatty acid is chosen as a lipid model, namely stearic acid, SA, because of its high stability in monolayers at the air/aqueous solutions interface. The effect of aleurone cell protein, AC protein, on the phase behavior and surface structure of SA monolayers at the air/water interface has been studied by a combined Langmuir and Langmuir-Blodgett (LB) technique and by atomic force microscopy (AFM) investigation. The AC protein and SA monolayers were transferred on glass support, at several controlled surface pressures, characteristic for both the condensed liquid and solid phase of pure SA monolayers. The results indicate that globular particles of AC protein adsorb on and penetrate into and specifically interact with SA monolayers stabilizing the lipid/protein interface by achieving highly ordered self-assemblies, which may also occur within aleurone layers. These structures might play an important role both in aleurone cell development and in seedling growth.

A STUDY ON THE LANGMUIR–BLODGETT (LB) FILMS OF C60/POLY (N-VINYLCARBAZOLE) (PVK) POLYMERS

2006 ◽  
Vol 20 (13) ◽  
pp. 753-760 ◽  
Author(s):  
XIAOHONG JIANG ◽  
XINGTANG ZHANG ◽  
YABIN HUANG ◽  
ZULIANG DU
Keyword(s):  
Arachidic Acid ◽  
Composite Films ◽  
Deposition Method ◽  
Hybrid Films ◽  
Lb Films ◽  
Vertical Deposition ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Atomic Force ◽  
Vertical Deposition Method

The Langmuir–Blodgett (LB) films of Poly (N-vinylcarbazole) (PVK) Polymers and its hybrid films with arachidic acid (AA) and C 60 were prepared by a vertical deposition method. Atomic Force Microscopy (AFM) and UV-Vis absorption spectroscopy were used to investigate the assembly of PVK/AA and PVK/ C 60/AA LB films. It was found that the C 60 molecules could be aggregated into smaller particles on the base of PVK polymers. The photoluminescence (PL) of PVK was dramatically quenched resulting from the electron transfer from PVK to C 60 in their composite films.

scholarly journals MONOLAYER CHARACTERISTICS OF CHITOSAN ASSEMBLED IN LANGMUIR FILMS MIXED WITH ARACHIDIC ACID

2014 ◽  
Vol 21 (04) ◽  
pp. 1450049 ◽  
Author(s):  
JAYASREE NATH ◽  
RANENDU KUMAR NATH ◽  
ADRITA CHAKRABORTY ◽  
SYED ARSHAD HUSAIN
Keyword(s):  
Arachidic Acid ◽  
Microscopy Study ◽  
Solid Substrate ◽  
Solid Support ◽  
Langmuir Films ◽  
Atomic Force Microscopy Study ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Atomic Force ◽  
Air Water Interface

In this paper, we report our investigation on the monolayer characteristics of a nontoxic, biocompatible, and biodegradable polymer chitosan (CHS) using Langmuir–Blodgett technique. It has been observed that pure CHS do not form stable monolayer. However, when CHS is mixed with arachidic acid (AA), stable self supporting monolayer is formed at air–water interface. This also can be transferred onto solid substrate. CHS–AA mixed monolayer is extremely stable with variation of pH. Atomic force microscopy study confirms the formation of stable uniform CHS–AA films onto solid support.

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