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کلوئیدها و سطوح الف: جنبه های فیزیکوشیمیایی و مهندسی
جزئیات رویداد
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همایش ، رویداد ، ژورنال
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  • preparation and characterization of mixed monolayers and langmuir−blodgett films of merocyanine 540/octadecylamine mixture

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 962
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     mixed monolayer of merocyanine 540 (mc540) dye and octadecylamine (oda) at the air/water interface has been prepared using the co-spreading method. the pressure–area (π–a) isotherm studies revealed that the mixtures of mc540/oda at a different ratio formed a stable monolayer at the air/water interface and these floating layers were easily transferred onto hydrophilic substrates as the y-type langmuir–blodgett (lb) film. the specific area per molecule in the π–a isotherm of the mixed monolayer of mc540/oda was larger than that of the pristine oda. the area can also get increased up to 40 mn/m surface pressure by the increase of the dye concentration in the mixtures. the lb films of mc540/oda mixture were formed at 30 mn/m surface pressure by transferring the mixed monolayer at the air/water interface on hydrophilic glass substrate via vertical dip-coating as mono- and multilayer films. the photophysical properties of mc540 in chloroform and lb films have been investigated using the absorption, steady-state and time-resolved fluorescence spectroscopy techniques. h-aggregate formation of mc540 both in chloroform and lb film were concluded from the spectroscopic results. the morphology of the one-layer mixed lb film of mc540/oda on the glass substrate has been characterized by afm (atomic force microscopy). the non-contact mode afm image of the one-layer mixed lb film showed that the film surface consisted of mc540/oda nanoclusters. in conclusion, our results contribute to understanding the strong interaction between mc540 and oda at the air/water interface, and show the effects of some parameters on the mixed lb films of mc540.

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