Metal-incorporated Langmuir Monolayers and Langmuir-Blodgett Films
0
Citation
0
Reference
20
Related Paper
Abstract:
The electrostatic binding and metal coordination between metal ions and Langmuir monolayers or LB films are discussed, and their effects on the monolayer 2D structure and related phase behavior are analyzed. The interfacial recognition and sensing for metal ions by Langmuir monolayers are also shown. Langmuir monolayers and LB films as 2D template to induce the 2D-oriented crystal growth via metal/monolayer binding is especially demonstrated. The abnormal catalytic characteristics, the functions and devices of metal-incorporated Langmuir monolayers and LB films are displayed by some examples. The review also shows the application of metal-chelating lipid monolayers on the interfacial study of bio-macromolecules. The review suggests the great roles of metal/monolayer binding in alternating monolayer structures and the assembly of functional metal complexes.Cite
We propose to control design of organometallic conducting Langmuir monolayer by utilizing geometrodynamic approach. By means of this approach the compressibility of the monolayer, which consists of molecules of thiophene-pyrrole series oligomer with covalently bound hydrophobic alkyl chain, has been analyzed for different subphase with iron salts. It has been discovered that the monolayers are polymerized and turn into monolayers of nanocyclic organometallic coordination compounds at a two-dimensional phase transition of the first order.
Oligomer
Pyrrole
Cite
Citations (3)
As a model for single layers of self-assembled monolayers, Langmuir monolayers of silver n-octadecanethiolates were prepared to study the interfacial properties involving the sulfur and metal ions. The interfacial property of the thiol groups was compared with those of two hydrophilic functional groups, namely, a hydroxyl and a carboxyl group. In situ real-time ellipsometry together with surface pressure−area isotherm measurements were carried out to gain insight into the structures of the monolayers and their silver complexes. Furthermore, Brewster angle microscopy was used to supplement the structural information obtaining real surface images with nanometer thickness resolution. The results are discussed in terms of the formation constant of silver complexes between silver and the functional groups.
Brewster's angle
Ellipsometry
Surface pressure
Cite
Citations (11)
Self-assembled monolayers (SAMs) of crown ether adsorbates on gold reversibly bind metal ions from aqueous solutions. The resulting changes of the electrochemical properties of the monolayers were monitored by impedance spectroscopy. The increased dielectric constant of the layer due to the complexation of ions results in an increase of the monolayer capacitance (CML). Analysis of the response curves with a Langmuir isotherm enables the determination of association constants of the SAMs with various metal ions. The cation binding also influences the charge-transfer resistance (RCT) of a redox couple Ru(NH3)62+/3+ in the electrolyte. Comparison of both responses allows an accurate interpretation of the origin of the resistive response. Furthermore, the association constants enable the quantitative determination of interactions between SAMs and metal ions, using either capacitive or resistive responses.
Self-assembled monolayer
Cite
Citations (100)
Development and study of novel biomimetic and biocompatible nano-engineered functional nanofilm
materials are currently important from fundamental and applied viewpoints [1]. Such nanomaterials can
serve as model systems for insight into the basic structural-functional interconnections at the nano-scale in
biological membranes and are useful for bio-medical applications including controlled drug delivery.
We present results of a study of novel nanofilm structures (Langmuir monolayers and Langmuir-Blodgett
films) formed by functional amphiphilic amines and their interfacial complexes with colloid nanoparticles
and polyelectrolytes including DNA. It was found that stearoylspermine molecules form stable Langmuir
monolayer on an aqueous subphase surface. The stearylspermine Langmuir monolayer compression
isotherm changes caused by interactions of the monolayer with aqueous subphase components (colloid
ligand-free magnetite nanoparticles and DNA molecules) have been studied. The observed characteristic
changes in Langmuir monolayer compression isotherms indicated to the binding of nanoparticles and
polyanions with cationic stearoylspermine monolayer. Monolayer LB films of interfacial polycomplexes
formed by stearylspermine and magnetite nanoparticles or DNA molecules were deposited onto the mica
substrate surface and the structure of obtained films was investigated using AFM technique.
The Langmuir monolayers and deposited LB films of the other type of functional amine-containing
compounds which are pH-sensitive synthetic lipids have been also studied. In our work the pH-sensitive
lipid trans-4,5,didodecyloxycarbonyl- trans-2-morpholinocyclohexanol was synthesized and studied. We
have found the substantial changes of the Langmuir monolayer compression isotherm shape of that lipid
caused by the change in aqueous subphase pH value from 7.5 to 5. Those changes can be the result of pH-
induced conformational changes in the pH-sensitive lipid molecule. Corresponding monolayer LB films were
deposited on mica substrate and studied using AFM technique. The various pH-dependent structural
features including surface micelles were observed in the LB films deposited at various pH subphase values.
The investigated functional amine-containing compounds are promising candidates for many potential
applications including formation of liposomal vesicles for encapsulation and controlled release, DNA and
drug delivery, formation of functional coatings on various substrate surfaces, etc.
Nanomaterials
Cite
Citations (0)
Abstract Meso-aryl-substituted porphyrin monolayers were obtained by the Langmuir method depending on the aliquots applied to the water surface and the composition of the subphase. Regardless of the composition of the subphase (pure water or a solution with copper nanoparticles stabilized by surfactant) porphyrin compression isotherms showed the formation of monolayers until a film collapse state is reached. The presence in the subphase volume of copper nanoparticles stabilized by a surfactant (sodium dodecyl sulfate) contributed to the formation of a more stable porphyrin monolayer. A significant difference in the values of the surface potential at the end of porphyrin monolayer compression depending on the composition of the subphase is established. This fact is very promising in the context of creating film heterostructures with improved operational properties.
Cite
Citations (7)
Cite
Citations (2)
Aqueous two-phase system
Cite
Citations (14)
Self-assembled monolayer anthraquinone-polyethers on gold electrodes were prepared and characterized by various spectroscopic and electrochemical techniques. The monolayers exhibited better thermal stability in solution, suggesting that multianchoring effects of disulfide moieties improve the integrated adhesion and binding stability of the monolayers. In contrast to solution electrochemistry, the unique structure and packing of the monolayer lead to selective ion binding to ions with the right size and charge, such as potassium and sodium. © 2004 The Electrochemical Society. All rights reserved.
Anthraquinones
Thermal Stability
Cite
Citations (0)
Biomolecule
Cite
Citations (229)