سنتز و بررسی خواص نانوذرات و نانوکلوئید سیلیکا در محیط قلیایی و اسیدی
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوینالهام کتوئی زاده 1 , مریم رسولی 2 , سید مجتبی زبرجد 3
1 - دستیار پژوهشی دانشگاه شیراز
2 - دانش آموخته مهندسی مواد دانشگاه شیراز
3 - دانشگاه شیراز
کلید واژه: نانوذرات, سنتز سیلیکا, نانوکلوئید, قلیایی, اسیدی,
چکیده مقاله :
نانو سیلیکا به عنوان یکی از پرکاربردترین نانو مواد در صنایع مختلف شناخته شده است. در این پژوهش، با استفاده از پیشماده سدیم سیلیکات نانوذرات و نانوکلوئید سیلیکا به ترتیب در محیط قلیایی و اسیدی سنتز میشوند. در ادامه تاثیر پارامترهای سنتز بر مورفولوژی ذرات حاصل در محیط قلیایی و خواص رئولوژیکی نانوکلوئید حاصل در محیط اسیدی مورد بحث و بررسی قرار میگیرند. مشاهدات میکروسکوپی نشان داد که با تغییر در نسبت آمونیاک به اتانول و غلظت محلول سدیم سیلیکات میتوان اندازه و مورفولوژی ذرات را تغییر داد. نتایج نشان داد که با افزایش نسبت اتانول به آمونیاک اندازه ذرات بزرگتر میشود و در مقابل، مورفولوژی ذرات با افزایش غلظت سدیم سیلیکات به صورت نامنظم درآمده و همچنین اندازه ذرات افزایش مییابد. در واقع در شرایط (1: EtOH/NH3 و 07/0 : Na2SiO3/H2O) میتوان به محلول کلوئیدی پایدار نانوذرات با اندازه 65 نانومتر دست یافت. همچنین زمان ژلشدن (tgel) سیلیکاژل حاصل در شرایط اسیدی توسط آزمون روبش زمان در فرکانسهای ثابت (Hz 5/0، 3/0 و 1/0) مورد بررسی قرار گرفت. با استفاده از روابط بررسی نقطه ژلشدن، مقادیر توان واهلش (Δ) برابر با 22/0 و بعد فراکتال(df) برابر با 39/2 اندازهگیری شدند که نشان میدهند، تعادل غیراستوکیومتری بر سیستم حاضر حاکم است. همچنین توسط طیفسنجی تبدیل فوریه مادون قرمز آنالیز شیمیایی شناسایی ترکیب شیمیایی سیلیکا انجام شد و طیفسنجی فلورسانس پرتو ایکس نشان داد که شستشوی نانوذرات سیلیس سبب افزایش خلوص از ۱۸/۸۴٪ به 33/87٪ میگردد.
Nanosilica in known as one of the most widely used components in various industries. In the current study, silica nanoparticle/colloid were synthesized in acidic and alkaline media using sodium silicate as a precursor. The effect of synthesis parameters on the morphology of the obtained nanoparticles and the rheological properties of silica colloid were studied. Microscopic observations revealed that size and morphology of the obtained silica nanoparticles can be changed by varying the ammonia to ethanol ratio, as well as the concentration of sodium silicate solution. The results revealed that the particles size is raised by increasing the ethanol to ammonia ratio and increasing the sodium silicate concentration leads to irregular and larger particles. the particles In fact, at (EtOH/NH3 :1 and Na2SiO3/H2O:0.07) a stable colloidal silica containing silica nanoparticles with average diameter of 65nm could be achieved. Additionaly, gelation time (tgel) of nanocolloid was measured using time sweep at constant frequencies of 0.1, 0.3 and 0.5 Hz. Applying the gelation point relations, the relaxation power (Δ) and fractal dimension (df) were measured as 0.22 and 2.39, respectively, indicating that the current system follows a non-stoichiometric equilibrium. Furthermore, the Fourier transform infrared spectroscopy (FTIR) test confirmed the formation of silica chemical bonding and the purity of the washed silica particles was increased from 84.18% to 87.33%, measured via X-ray fluorescence spectroscopy (XRF)
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