Adsorption of Polymeric Inclusion Compounds on Muscovite Mica

Abstract

α-Cyclodextrin, α-CD, which does not adsorb on mica, can be bound to this surface as a polymeric inclusion compound that is formed by threading many α-CD rings on a cationic polyelectrolyte, poly(decamethylenebipyridinium dibromide). The major driving force of the adsorption of the polymer and the polymeric inclusion compound is ion exchange with surface ions of mica. Somewhat less polymer is adsorbed when it is engaged in the inclusion complex than as pure polymer. The rates of adsorption for both the polymer alone and for the polymer in the inclusion compound depend strongly on the particular cation initially present at the mica surface (Li+ or K+); it is much more rapid with Li+. The equilibrium between complexed α-CD and uncomplexed α-CD, found in solution, is modified upon adsorption of the complex to favor the release of α-CD from the complex. However, the α-CD is only slowly released from the complex on the surface and, as a result, mica-bound complex can be isolated.

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

“…8) and comprises conducting and light-emitting polymers 89,112, , other non-conjugated redox-active polymers 49,62,131,132,[200][201][202][203][204][205][206][207] , polymeric complexes such as the Cu 2+ complex of poly(ethyleneimine) 80) , Ru 2+ complex of 2,29-bipyridyl containing polymers 170-172, 200, 208) , or an Os 2+ complex of poly(vinylpyridine) 196,[209][210][211] , reactive polymers 35,87,148,[212][213][214][215][216] , polymers bearing non-linear optically active dyes 35,138,148,214,[217][218][219][220][221][222][223][224][225][226] , liquid crystalline polyelectrolytes 105,[135][136][137] , and dendrimers [227]…”

“…Typically when comparing increasingly hydrophobically substituted analogs, somewhat thicker films are obtained for given deposition parameters 54,142) . At least at low ionic strength, the associated polymer coils seem to decoil upon adsorption, given thin flat layers 201,230) . Fluorophore labeled, hydrophobically modified associative polycations (44, 45) for example ( Fig.…”

“…Also, their smooth surface renders them well suited for X-ray reflectivity studies 131,312,381,382,385) and for near-field microscopy. For these purposes, mica 75,103,104,201,252,253,281,316,323,348,386,387) and float glass 19,80,131,180,182,184,185,388,389) present alternatives. Gold coated surfaces enable electrochemical studies 86,196,205,209,211,340,354,390,391) , investigations by quartz crystal microbalance (QCM) 65,86,102,119,130,202,238,266,279,305,338,339,350,…”

Cyclodextrin-based multivalent glycodisplays: covalent and supramolecular conjugates to assess carbohydrate–protein interactions

“…The most characteristic feature of these ''beads-on-a-string'' dynamic systems is that the cyclic components can spin around the axes of the polymer as well as move back and forth along the polymer chain. The cavity of cyclodextrins, particularly of aCD and bCD, has been shown to be well adapted to pseudopolyrotaxane formation with linear polymers [119][120][121] such as poly-(ethylene glycol) (PEG), poly(propylene glycol) (PPG) or poly(tetrahydrofuran) (PTHF). 122 If the CD beads are part of a glycoconjugate, then a ''mobile'' display of the coating sugar ligand is obtained, with the potential to self-fit the intersaccharide distance and orientation in the presence of a given receptor partner for an optimal interaction (Fig.…”

Self-Assembled Monolayers of Alkylammonium Ions on Mica: Direct Determination of the Orientation of the Alkyl Chains

“…XPS measurements show that after immersion of the mica in the LiCl solution for more than 3 days, the recorded potassium signal does not decrease further, which confirms a complete exchange of the surface K with Li ions. The exchange with Li ions ensures that a subsequent exchange with the surfactant ions is complete, as lithium ions can be exchanged easier than potassium ions (9,25,35).…”