عملکرد نانوصفحات گرافن ‌اکساید بر دیسپرسیون نانوذرات اکسید سیلیس و تأثیر آن بر خصوصیات مکانیکی ملات سیمانی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه صنعتی امیرکبیر، تهران، ایران

2 دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

در مطالعه حاضر مکانیزم رسوب‌گذاری نانوذرات اکسید سیلیس (NS) بر روی نانو صفحات گرافن ‌اکساید (GO) از طریق هیدرولیز تترا ارتو سیلیکات (TEOS) در محلول آب و الکل و عملکرد آن در ملات سیمانی مورد بررسی قرار گرفته ‌است. در بخش اول این پژوهش نحوه برهم‌کنش‌های احتمالی مابین نانوذرات، به کمک طیف‌سنج پرتوهای مرئی (Uv-Vis) و میکروسکوپ الکترونی عبوری (TEM) و در بخش دوم به خصوصیات مکانیکی ماده کامپوزیت متشکل از نانو‌سیلیس و گرافن ‌اکساید (NS&GO) توسط تکنیک شبیه‌سازی دینامیک مولکولی پراخته شده است. در نهایت کاربرد نانوذرات به ‌صورت منفرد و کامپوزیت در ملات سیمانی و تأثیرات آن بر خصوصیات مکانیکی ملات‌های حاوی پوزولان‌های طبیعی و فاقد آن مورد ارزیابی و مقایسه قرار گرفت. بهبود دیسپرسیون ذرات نانوسیلیس بر روی صفحات گرافن ‌اکساید بدون استفاده از سورفکتانت‌ها در تصاویر TEM قابل رؤیت است. همچنین نتایج شبیه‌سازی دینامیک مولکولی افزایش 75 درصدی مقدار تنش قابل تحمل و افزایش 250 درصدی مدول یانگ ماده کامپوزیت نسبت به نانوسیلیس منفرد را نشان می‌دهد. مقاومت فشاری و کششی 28 روزه ملات‌های حاوی کامپوزیت نانومواد نیز به ترتیب با افزایش 31% و 100% نسبت به طرح کنترل همراه بوده است. در یک نتیجه‌گیری کلی دیسپرسیون و توزیع مناسب نانوذرات، خاصیت هسته‌زایی نانوسیلیس، خاصیت پل‌زنی گرافن ‌اکساید در کنار فعالیت بالای پوزولان‌ زئولیت موجب عملکرد مناسب ملات ZNS&GO گردیده ‌است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Performance of Graphene Oxide nanosheets on the dispersion of nano SiO2 and its effect on the mechanical properties of cement mortar

نویسندگان [English]

  • Aliakbar Ramezanianpor 1
  • Mohammad Mahdi Zaeri Amirani 2
  • Sajjad Mirvalad 2
1 Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran
2 School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

In the present study, the sedimentation mechanism of SiO2 nanoparticles (NS) on Graphene Oxide (GO) nanosheets by hydrolysis of Tetra Ortho Silicate (TEOS) in water/ethanol solution was investigated. In the first part, the possible interactions among nanoparticles by UV-Vis and Transmission Electron Microscopy (TEM), and in the second part, the mechanical properties of nanocomposite materials contain NS and GO (NS&GO) by molecular dynamic simulation (MDS) were discussed. Finally, the application of single and hybrid nano materials on 12 kinds of the mixture of mortars containing natural pozzolan was compared with mechanical properties. the improvement of dispersion of NS on GO nanosheets was visible in TEM. Also, the results of MDS demonstrate 75% increase in tolerable stress and 250% increase in Young’s modulus in nanocomposite compared with single nano-SiO2. 28-day compressive and tensile strength mortars containing NS&GO increased by 31% and 100%, respectively and compared with the control. As a result, appropriate dispersion and distribution of nanoparticles, NS&GO through nucleation properties, and zeolite through pozzolanic properties improved the mechanical function of mortars.

کلیدواژه‌ها [English]

  • Graphene Oxide
  • NanoSiO2
  • Natural Pozzolans
  • Mechanical properties
  • Molecular dynamics simulations

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 10
دی 1401
صفحه 3759-3776

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