Lyotropic phase behavior and gel state polymorphism of phospholipids with terminal diene groups: Infrared measurements on molecular ordering in lamellar and hexagonal phases

Article Abstract:

Infrared dichroism calculations were used to investigate the phase behavior of the diene lipid 1,2-bis(11,13-tetradecadienoyl)-sn-glycero-3-phosphoprylethanolamine (DTDPE) and its phosphatidylcholine analogue (DTDPC). The external variables used are temperature and relative humidity. Results showed an inverse hexagonal phase at high temperatures and a lamellar gel at low temperatures. Liquid-crystalline bilayers were found to appear only in a range of intermediate temperatures and at a high degree of hydration. Results also revealed that the polymethylene parts of the tetradecadienoyl chains are responsible for the chain melting transition.

Polymorphism (Crystallography)

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Coating single-walled carbon nanotubes with phospholipids

Article Abstract:

An experiment is performed to characterize the efficiency of solubilizing single-walled carbon nanotubes (SWNTs) through various types of phospholipids and other amphiphilic surfactants. It demonstrates that lysophospholipids provide exceptional solubility and extended stability for SWNTs and that lysophospholipids wrap SWNTs when SWNTs are in lipid phase, suggesting that environment plays major role in the binding process.

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[57.sup.Fe] Mossbauer spectroscopy on multiwalled carbon nanotubes with metal filling

Article Abstract:

Mossbauer measurements at different temperatures was described for multiwalled carbon nanotubes (MWCNTs) with metallic encapsulations. The application of the micromagnetic model to wire structures helps in understanding the unusual field dependence of the magnetization for different averaged diameters of the nanowires.

Magnetic properties, Electronic equipment and supplies, Magnetization, Encapsulation (Electronics)

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