Effect of Micellization pH on Properties of Sphere-like Mesoporous Hydroxyappatite
محل انتشار: ماهنامه بین المللی مهندسی، دوره: 28، شماره: 7
سال انتشار: 1394
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 514
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شناسه ملی سند علمی:
JR_IJE-28-7_013
تاریخ نمایه سازی: 15 آذر 1394
چکیده مقاله:
Mesoporous hydroxyapatites were syntesized by self-assembly method using Cetyltrimethylammonium bromide (CTAB) as cationic surfactant and 1-dodecanethiol as pore expander with pore expander/surfactant mass ratio of 4.22 and synthesis temperature of 80 °C at different micellization pH values. The field emission-scanning electron microscopy (FESEM), X-raydiffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, pore size distribution plot(Barrettt, Joyner, and Halenda (BJH) method), fourier transform infrared spectroscopy (FTIR) and low-angle X-ray diffraction (LA-XRD) results beside the titration investigation of 1-dodecanethiol revealed that ionizied 1-dodecanethiol concentration ([RS-]) increased exponentially by changes in pH.The micellization pH has a key role in physico-chemical characteristics of samples. Increase in pH canchange the ionization degree of 1-didecanethiol and swell the micelle and also lead to larger pores (pore diameter of 2.93 in lower pH and 24.48 in higher pH). Changes in the micellization pH also affect the dielectric constant of water and lead to variation in patricle size
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نویسندگان
l bakhtiari
School of Metallurgical and Materials Engineering, Iran University of Science and Technology, Tehran, Narmak , Iran.
h.r rezaie
School of Metallurgical and Materials Engineering, Iran University of Science and Technology, Tehran, Narmak , Iran.
j javadpour
School of Metallurgical and Materials Engineering, Iran University of Science and Technology, Tehran, Narmak , Iran.
m erfan
School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.