Self-assembly on surfaces

It is also possible to stndy the self-assembly of individnal molecules as well as networks such as 

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A different approach can be used to induce nanopartide self-assembly on surfaces or matrixes both by electrostatic interactions and chemical bonding between a functionalized nanoparticle and a surface. This is a vast area of research in which many types of substrates like Si, Si02, Ti02, A1203, MgO, carbon nanotubes, and so... 

Dendronized polymers can self-assemble on surfaces into highly ordered layers, which renders them into a material attractive for various applications. The assembly process can be investigated on the molecular scale using the sfm. In addition, the sfm may be used to manipulate single macromolecules on solid substrates in order to generate assemblies, which would not form spontaneously. 

Recently we showed the possibility of triangular DBA substituted with six alkoxy groups, here denoted as DBA-OCn, where n represents the number of carbon atoms in the alkoxy chains (Fignre 6.1a), for use as a model system to study molecular self-assembly on surfaces. ... 

Understanding and predicting the assembling behaviors of multi-component mixtures on solid surfaces is very challenging because of the formation of complex assemblies such as superlattice structures and quasi-crystals on surfaces. In this section, we describe the formation of superlattice structures at liquid-solid interfaces by co-adsorption of two structurally similar molecules, i.e., DBA-OCn bearing alkoxy chains that differ by only one methylene unit, via synergetic interactions between mutual components. Since DBA-OCn at the monocomponent level exhibits an odd-even effect related to molecular chirality that is an origin of superlattice formation, we will start with a discussion on the odd-even effect on molecular self-assemblies on surfaces. 

The formation of superlattice structures in molecular self-assembly on-surfaces provides detailed insight in how molecules act cooperatively by means of STM. By studying monolayers formed by the self-assembly of alkoxy-substituted dehydro[12] annulenes (DBAs) at the liquid-solid interface, we realized that the high adaptability of this building block led to the generation of chirality on surfaces at single molecular and supramolecular levels and formation of superlattice structures on surfaces. 

Surface energies of different end-functionalized trichlorosilane monolayers self-assembled on oxidized PDMS ... 

Liu DZ, Szulczewski GJ, Kispert LD, Primak A, Moore TA, Moore AL, and Gust D. 2002. A thiol-substituted carotenoid self-assembles on gold surfaces. Journal of Physical Chemistry B 106(11) 2933-2936. 

Nuzzo RG, Zegarski BR, Dubois LH (1987) Fundamental studies of the chemisorption of organosulfur compounds on Au(lll). Implications for molecular self-assembly on gold surfaces. J Am Chem Soc 109 733-740... 

It is noted that the anodic peak current prominently increases with an increase in the molar ratio of ferrocene to glucose oxidase whilst the amount of enzyme self-assembled on the electrode surface is fixed as presented in Figs. 14-16. This indicates that each modified ferrocene may contribute to electron transfer between the enzyme and the electrode in the case of gold-black electrode, the ferrocene-modified enzyme could form multi electron transfer paths on the porous gold-black electrode. 

Long chain alkylmercaptans and disulfides readily self-assemble on gold surfaces to form compact organized monolayers in which the sulfur is chemisorbed to the gold and the hydrocarbon tail is extended away from the surface (1.-5). The mercaptan monolayers strongly inhibit gold oxidation in dilute sulfuric acid and also block diffusion of aqueous ions (e.g. Fe 2 3, Fe(CN) 63, ... 

Figure 3.14 Different configurations of vertically aligned CNTs either by m-situ growth of CNTs from plasma enhanced CVD or CNT self-assembly through surface reactions on gold or silicon substrates.

To examine monolayers on liquid surfaces in situ, multiple interactions by mounting mirrors above and below the surface have been used. X-ray reflectivity measurements have been used to study the counterion overlayers at the interface between electrolyte solutions and monolayers of carboxylic acids terminated alkanethiols self-assemblies on Au (Birdi, 1999). 

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