Characteristics of carborane-PEG monolayer synthesized by Langmuir-Blodgett method
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The carborane (CB) is a cluster composed of boron, carbon and hydrogen atoms. CB has been accepted as a boron neutron capture therapy material for its distinctive properties and its potential. Solubility problem of CB can be solved by joining each CB to polyethylene glycol (PEG). Three different molecular weights of PEG (Mwt 3800, 5100 and 6000) are used. By using surface pressure (Π)-surface area (A) isotherm, hysteresis and atomic force microscope (AFM), their Langmuir films were investigated. CB-PEG complexes have different limiting area depending on the molecular weight of PEG. The close-packed arrangement for the higher molecular weights of PEG is showed. At the low pressure, CB-PEG complexes make dot domains. The higher surface pressure is, the larger domains make because the domains are aggregated. Consequentially, as the surface pressure increased, the surface area increased.