بررسی ویژگی های مکانیکی و گرمایی آئروژل های هیبریدی گرافن اکسید / اکتا(آمینوفنیل) پلی هدرال الیگومریک سیلسس کویی اکسان

نوع مقاله : علمی-پژوهشی

نویسندگان

پژوهشکده مواد پلیمری، دانشکده مهندسی پلیمر، دانشگاه صنعتی سهند، تبریز، ایران

چکیده

در این مطالعه ویژگی­ های مکانیکی، رسانش گرمایی، و پایداری گرمایی آئروژل­ های هیبریدی گرافن اکسید/ اکتا(آمینوفنیل) پلی­ هدرال ­الیگومریک ­سیلسس ­کویی­ اکسان با تخلخل و مساحت سطح بالا و چگالی بسیار پایین مورد ارزیابی قرار گرفت. مجموعه خواصی مانند مساحت سطح و تخلخل بالا، و چگالی و رسانش گرمایی بسیار پایین باعث شده است تا این آئروژل پتانسیل بالایی در کاربردهای گسترده­ای از جمله وسایل ذخیره و تبدیل انرژی (مانند ابرخازن، مواد الکترود و غیره)، جاذب آلاینده ­ها، و عایق گرمایی داشته باشند. خواص مکانیکی و پایداری گرمایی آئروژل­ های تهیه شده در مقایسه با آئروژل گرافن خالص گزارش شده، بهبود قابل توجهی نشان دادند. بررسی نتیجه ­های رسانش گرمایی آئروژل­ های گرافنی مورد مطالعه نشان داد که در انتقال گرما کل، سهم انتقال گرما از طریق فاز جامد نسبت به مکانیسم ­های دیگر انتقال گرما برتری دارد. این برتری حتی در دماهای بالاتر هم حفظ می­ شود. این امر بدین دلیل می­ باشد که به خاطر ضریب جذب مادون قرمز بالای آئروژل های گرافنی، انتقال گرمابا تابش به طور مؤثری مهار می ­شود. همچنین، اندازه پایین متوسط روزنه ها آئروژل ­های گرافنی مورد بررسی، میانگین مسیر آزاد مولکول­ های گاز را درون روزنه ها در دمای بالا محدود می ­کند و از این طریق سهم انتقال گرمایی گازی کاهش می ­یابد. از آنجایی که این آئروژل ­ها تخلخل بالای % 5/99 دارند، سهم انتقال گرما فاز جامد در انتقال گرما کل هم بسیار پایین می­ باشد. سرانجام، تأثیر محتوای مواد اولیه، چگالی و ریخت شناسی بر روی ویژگی­ های مکانیکی، پایداری گرمایی، و رسانش گرمایی مورد بررسی قرار گرفت و رابطه ساختار ـ خواص آئروژل­ های تهیه شده تبیین شد.

کلیدواژه‌ها

موضوعات

مراجع

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