Langmuir-Blodgett monolayers, formation

FIGURE 3.60 Langmuir-Blodgett monolayer formation on the (a) hydrophilic substrate by withdrawing from the trough and (b) hydrophobic substrate by immersion in the trough. 

Poly[2-[[11 -(methacryloyloxy)undecyl]oxy]-3-methoxy9,10,16,17,23,24, hexakis (dodecyloxy)phthalocyanine] (polyundecyloxy Langmuir-Blodgett monolayer formation studied with IR, ellipsometry, electron diffraction effect of adding 1 -araohidic acid discussed. [177]... 

Song H, Kim F, Connor S, Somorjai GA, Yang PD (2005) Pt nanocrystals shape control and langmuir-blodgett monolayer formation. J Phys Chem B 109 188-193... 

Zhang Y et al (2007) One-step polyol synthesis and langmuir-blodgett monolayer formation of size-tunable monodisperse rhodium nanocrystals with catalytically active (111) surface structures. J Phys Chem C 111 12243-12253... 

Zhang, Y. W., M. E. Grass, S. E. Habas, F. Tao, T. F. Zhang, P. D. Yang, and G. A. Somoqai. 2007. One-step polyol synthesis and Langmuir-Blodgett monolayer formation of size-tunable monodisperse rhodium nanocrystals with catalytically active (111) surface structures. J. Phys. Chem. C 111 (33) 12243-12253. 

Pt nanocrystals shape control and Langmuir-Blodgett monolayer formation. Journal of Physical Chemistry B, 109,188. 

Besides self-assembly on the surface of metals, another example of self-assembly is the formation of Langmuir-Blodgett monolayers on the surface or at the interface of liquids.47,48 One approach to molecular-based electronic devices that has made use of self-assembled Langmuir-Blodgett films is the crossbar-based defect-tolerant approach to molecular computing 49 Rotaxane molecules that depend on physical dislocations within the molecule to produce switching functionality have been designed such that they will... 

Fig. 1. Successive steps in monolayer and Langmuir-Blodgett multilayer formation...

Fig. 3.5 Representation of a scheme of an experiment (upper set of drawings) and the obtained experimental results presented as AFM images (middle part) and cross-sectional profiles (bottom) that provides evidence of silica nucleation and shell formation on biopolymer macromolecules. Scheme of experiment. This includes the following main steps. 1. Protection of the mica surface against silica precipitation. It was covered with a fatty (ara-chidic) acid monolayer transferred from a water substrate with the Langmuir-Blodgett technique. This made the mica surface hydrophobic because of the orientation of the acid molecules with their hydrocarbon chains pointing outwards. 2. Adsorption of carbohydrate macromolecules. Hydrophobically modified cationic hydroxyethylcellulose was adsorbed from an aqueous solution. Hydrocarbon chains of polysaccharide served as anchors to fix the biomacromolecules firmly onto the acid monolayer. 3. Surface treatment by silica precursor. The mica covered with an acid mono-...

Interest in Langmuir-Blodgett (LB) films is wide spread and formation of ordered thin organic films by transforming lipid monolayers from a water surface is well known [1]. The... 

Figure 4.1. Schematic diagram of the formation of a Langmuir-Blodgett film. Each amphiphilic molecule is represented by a circle with a tail, where the circle denotes the hydrophilic end of the molecule. The left hand diagram represents the deposition of a monolayer on a hydrophilic substrate moving upwards. The right hand diagram represents the deposition of a second layer during the downward movement of the substrate.

Two methods have been proposed for the preparation of organosilane monolayers. One is chemisorption from organosilane solution [4-6], and the other one is Langmuir-Blodgett (LB) method or water-cast method [7-23], Fig. 1 shows the film formation mechanism of the organosilane by LB method (a) and chemisorption method (b). In the case of LB method (Fig. 1(a)), the toluene solution of organotrichlorosilane was spread on the water surface (pH 5.8) at a controlled subphase temperature. To attain quasi-equilibrium state of the monolayer, the monolayer was kept on the water subphase under a given... 

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