Langmuir-Blodgett transfer technique

One of the new trends in chemical analysis appeared in the last decade is that the miniaturization. It becomes apparent in the miniaturization of analytical devices, separation procedures, measuring tools, analyzing samples and as a consequent the term micro have appeared. Further development of this trend have led to transfer from the term micro to nano one (nanoparticles, nanofluides, nanoprobes, nanoelectrodes, nanotubes, nanoscale, nanobarcode, nanoelectrospray, nanoreactors, etc). Thereupon a nanoscale films produced by Langmuir-Blodgett (LB) technique are proposed for modifying of chemical sensors. 

Transfer of Langmuir fdms of particles from the air-water interface onto solid supports, e.g., by the Langmuir-Blodgett (LB) technique [71-83]... 

Monolayers can be formed on electrode surfaces by irreversible adsorption or covalent attachment, or, in the form of organized assemblies, by Langmuir-Blodgett transfer and self-assembly techniques. 

Figure 12. Schematic representation of the Langmuir-Blodgett-Kuhn technique The Langmuir monolayer prepared at the water-air interface at a selected surface pressure is transferred during the withdrawal of the solid substrate. Supramolecular architectures can be built up by choosing different functional units in the individual layers.

The preparation of ordered thin films is of considerable interest in the construction of electronic devices and model membrane systems. A method that has gained much popularity in this area is the Langmuir-Blodgett (LB) technique [67]. The technique is based on the premise that molecules with a hydrophilic head and a hydrophobic tail can form a monolayer at an airwater interface and can be transferred onto a... 

Aviram and Ratner did not speeify how such a device could be interrogated electrically. There are two choices. The Langmuir-Blodgett (LB) technique allows for the assembly of one-molecule-thick ( monolayer ) films or of several-molecule-thick films (multilayers) the assembly onto surfaces by physisorption has the advantage that the transfer of amphiphilic molecules from the... 

Development of a sensor for neurological ly active compounds using the vesicle system characterized here necessitates stabi i Ization of a functional receptor system onto a sol id substrate. Possible methods for this stabi I Ization are direct covalent attachment via the protein or the Iipid componentSt fusion of vesicular structures with the substrate(26), or incorporation of the protein Into a monolayer at an alr/water interface and transfer of the monolayer onto the substrate by Langmuir-Blodgett deposition techniques(27). 

Recently, the Langmuir-Blodgett (LB) technique has been recognized as a useful way of tailoring thin films of molecular thickness. Interest in the LB technique has led to a number of investigations of different types of materials. For example, the classic long-chain fatty acids and alcohols as well as polymerizable molecules, e.g. diacetylenic acids [211-213], aromatic hydrocarbons, e.g. substituted anthracenes [214, 215], TCNQ radical anion salts [216, 217] and charge transfer complexes [218-220] and dye substances can now all be produced as monomolecular layers. 

Several techniques have emerged for creating more ordered two- and three-dimensional assemblies of nanoparticles including Langmuir-Blodgett transfer, layer-by-layer assembly, and diblock copolymer lithography. These techniques are suitable for assembling MNPs with well-ordered nanostructures. A complete discussion of these techniques is beyond the scope of this chapter, but these topics have been extensively reviewed. ... 

Langmuir films were transferred to freshly cleaved mica solid support by a KSV film hft with Langmuir-Blodgett (LB) technique at a film hft speed of 2 mm/min to keep the surface pressure constant during the transfer. 1 mm/min... 

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