کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
691246 1460432 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamics of water state in nanoconfined environment
ترجمه فارسی عنوان
دینامیک وضعیت آب در محیط نانوکینفین
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
چکیده انگلیسی


• A four-region model was applied on CTAB reverse micellar system to consider all interactions with water molecules.
• Water states were obtained using deconvolution technique of FT-IR absorption spectra of OH stretching band.
• We considered the dynamics of system and competing of all species in reverse micelles for binding water molecules.
• Most of water molecules were found like frozen water in reverse micelles.

To investigate water state in vitro conditions, cetyltrimethylammonium bromide/isooctane 1-hexanol reverse micellar system was used as a model for nanoscale medium. Using Fourier transform infrared spectroscopy and deconvolution technique, the water states in these systems were studied at several water/surfactant molar ratios, wo, with respect to time. The presence of four sub-peaks in deconvolution of FT-IR absorption spectra of OH stretching band certified four different states of water. The results showed time dependency of water state, especially in those systems having low wo, that are more dynamic. Also, exchange of water molecules between different states results in approaching each state to a final steady state value. Based on deconvolution results, it was found that mechanism of ionizing surfactant head group can control water bonded to the bromide counter ion. Moreover, more than 50% of water molecules are like frozen water in reverse micelles and they are not available for solubilization of hydrophilic compounds. Based on the results of this study, state and properties of water in nanoscale medium are quite different from bulk scale.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Taiwan Institute of Chemical Engineers - Volume 45, Issue 3, May 2014, Pages 828–832
نویسندگان
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