Langmuir−Blodgett (L−B) Multilayer Films

Abstract

Many multilayer Langmuir−Blodgett films of saturated long-chain fatty acids and multivalent metals reported in the scientific literature are isostructural with bulk soap phases. The conventional view that these films feature the “hairpin” arrangement of double-chain amphiphiles in self-assembled lamellae appears to be invalid beyond the monolayer for many fatty acid/metal (II, III) films. The chains undergo a remarkable conformation transition from a “hairpin” to a “splayed-chain” structure after more monolayers are deposited. This previously undescribed conformational transition is considered to play a major role in the “overturning” phenomena and “island” formation observed in these L−B films.

Metal organic framework (MOF) liquid crystals. 1D, 2D and 3D ionic coordination polymer structures in the thermotropic mesophases of metal soaps, including alkaline earth, transition metal and lanthanide soaps

“…2.1 Å) due to the formation of two kinks (G-T-G) per molecular length, and is more consistent with the formation, on average, of a single gauche bond per chain or less, requiring about 1.6 Å shortening of the long-spacing per soap molecule in the splayedchain arrangement [81]. The increase of the chain-packing peak (from d = 4.05 Å to 4.23 Å) is synonymous with an increased interfacial chain cross-sectional area from about 18.9 Å 2 to 20.6 Å 2 per hydrocarbon chain (assuming no defects).…”

Biomembrane models

“…113 An important advantage of the monomolecular layer system is the direct deposition of the fi lm onto a solid support, by means of the LangmuirBlodgett technique (LB). 114 In simple words, dipping a slide into the water subphase, at the top of which a lipid monolayer had previously formed, will result in monolayer deposition during dipping for a support with a hydrophobic surface, or during lifting-up, for a support with a hydrophilic surface. Lipid monomolecular layers deposited onto solid supports using LB fi lms can easily be subjected to numerous microscopic and spectroscopic studies.…”

Bioinert surface to protein adsorption with higher generation of dendrimer SAMs

“…Well-defined linear polymer brushes at the interface provide a precisely controlled surface, and the interfacial force for protein adsorption has been formulated using parameters such as chain density and layer thickness [15,16]. Well-defined polymer brushes have been achieved by living radical polymerization [17] and Langmuir-Blodgett membranes [18]. In these reports, the layer thickness of the polymer brush and the densities of the polymer were reported to play important roles in protein adsorption and the bioinert properties in terms of the interfacial force.…”