Molecular sieving by a perforated Langmuir-Blodgett film

Transport properties of water and pentane in Langmuir–Blodgett films

“…The study of LB films as membrane constituents is motivated by the possibility of modifying the transport of mass through a film by controlling the structure of the film (Conner et al, 1993;Okahata et al, 1986). While the thinness of an LB film would allow very high throughput of material, it would also require that the film be physically supported to withstand pressure differences.…”

“…Thus composites made of a permeable polymer coated with an LB film could serve as practical membranes. The polymer would provide the mechanical support while the LB film would be used to control selectivity and allow high permeation rates (Gaines and Ward, 1977;Rose and Quinn, 1968;Conner et al, 1993;Albrecht et al, 1984;Bruinsma and Stroeve, 1994;Kim et al, 1989;Osiander et al, 1988).…”

Hyperthin Membranes for Gas Separations via Layer‐by‐Layer Assembly

“…To be able to deposit PEMs on PTMSP, the surface of PTMSP must be made hydrophilic and have a high density of charged groups. In our early studies, we used the Langmuir‐Blodgett deposition method to modify the surface of PTMSP . Because self‐assembly methods are much simpler (e. g., adsorbing a monolayer of branched poly(ethyleneimine), b ‐PEI onto PTMSP), we carried out a detailed study to determine whether there were any advantages to the more laborious LB method.…”

“…In our early studies, we used the Langmuir-Blodgett deposition method to modify the surface of PTMSP. [37][38][39][40][41][42] Because self-assembly methods are much simpler (e. g., adsorbing a monolayer of branched poly(ethyleneimine), b-PEI onto PTMSP), we carried out a detailed study to determine whether there were any advantages to the more laborious LB method. Thus, a Langmuir-Blodgett monolayer of a poly(1-octadecene-alt-N,N,N-trimethylammonium-Nethylmaleimide) chloride (POMTMA) was compared with a self-assembled monolayer of branched poly(ethyleneimine) (b-PEI) as anchor layers, using PEMs formed from PDDA and PSS as a test case ( Figure 5).…”

Perforated monolayers. Progress report, July 1, 1990--December 31, 1992

“…Friedel-Crafts acylation (CH3COC1) of this tetraether afforded 5,11,17,23-tetraacetyl-25,26,27,28-tetrakis-(1-n-octyloxy)calix [4]arene (4); subsequent haloform oxidation, and esterification (CH2N2), yielded 5,11,17,23-tetracarboxymethyl-25,26,27,28-tetrakis-(1-noctyloxy)calix [4]arene (5). 5,11,17,26,27,arene (6) was prepared by bromination of the starting tetra-n-octyloxyether (NBS), followed by sequential displacement with cyanide and hydrolysis. Calix [4]arenes 4-6 proved to be effective in extracting Li+, Na+, K+, and Cs + picrates from chloroform into water.…”