علوم و فناوری کامپوزیت

سنتز و مشخصه‌یابی کامپوزیت سیمان- نانولوله کربنی تولید شده به روش نهشت بخار شیمیایی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، فیزیک حالت جامد، دانشگاه مازندران، مازندران، ایران

2 استاد، فیزیک حالت جامد، دانشگاه مازندران، مازندران، ایران

3 استادیار، مهندسی مواد، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

چکیده

تقویت مواد با استفاده از نانولوله‌های کربنی، رویکرد جدید در ساخت کامپوزیت‌های نو و پیشرفته است. در این بین، استفاده از نانولوله‌های کربنی برای تقویت مواد سیمانی از جمله سیمان‌های ترمیمی مورد توجه قرار گرفته است. چالش مهم در ساخت کامپوزیت سیمان- نانولوله کربنی فرایند سنتز نانولوله روی سیمان است. در این مقاله، سنتز و مشخصه‌یابی کامپوزیت سیمان- نانولوله کربنی تولید شده به روش نهشت بخار شیمیایی مورد ارزیابی قرار گرفت. این سنتز در دمای 800 درجه سانتی‌گراد و با استفاده از گاز‌ استیلن به عنوان منبع کربنی، آرگون به عنوان گاز حامل و اکسید آهن هماتیتی به عنوان عامل کاتالیستی انجام شد. از روش تلقیح مرطوب برای آماده‌سازی بستر کاتالیستی شامل ذرات سیمان و اکسید آهن استفاده شد. مشخصه‌یابی کامپوزیت سیمان-نانولوله کربن و کیفیت نانولوله‌های کربنی به ترتیب با استفاده از تصاویر میکرسکوپ‌های الکترونی روبشی و عبوری و آنالیز اشعه ایکس و طیف‌سنجی رامان انجام شد. همچنین بهره‌کربنی محصول سنتز‌شده به وسیله آنالیز حرارتی جرمی تعیین شد. نتایج حاصل از آزمایشات نشان داد که به روش نهشت بخار شیمیایی امکان رسوب نانولوله‌های کربنی با توزیع قطری، بهره و کیفیت مناسب وجود دارد. همچنین مشاهده شد که بیشتر نانولوله‌های کربنی سنتز شده دارای سرهای باز هستند که بیان‌گر رشد از سر نانولوله‌های کربنی است. در نهایت نتایج آزمون‌های مکانیکی نشان داد که حضور نانولوله‌های کربنی با ساز و کار پل‌زدن، بیرون‌زدگی و پر‌کردن تخلخل‌ها موجب تقویت مقاومت فشاری نمونه‌های ملات سیمان شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Synthesis and characterization of cement- CNT composite produced by CVD process

نویسندگان [English]

  • Fatemeh Ghaharpour 1
  • Ali Bahari 2
  • Majid Abbasi 3

1 Department of Physics, University of Mazandaran, Mazandaran, Iran

2 Department of Physics, University of Mazandaran, Mazandaran, Iran

3 Department of Materials Science and Engineering, Babol Noshirvani University of Technology, Babol, Iran

چکیده [English]

Reinforcing of materials using carbon nanotubes are new approach for development of new and or advanced composites. In the meantime, the use of carbon nanotubes to reinforce cementitious materials, especialy reconstructing cement, is considered. The synthesis process of nanotubes on cement is the main problem in making the composite. In the paper, synthesis and characterization of cement-CNT composite produced by CVD process was investigated. The CVD process at 800°C using acetylene gas as a carbon source, argon as carrier gas and hematite iron oxide as a catalyst was performed. Wet impregnation method for preparing the catalyst bed of cement and iron oxide particles were used. FESEM, EDX, TEM and Raman spectroscopy were used to characterization CNTs/Cement composite and the size, morphology and quality of CNTs respectively. The growth yield of carbon nanotubes was determined by TGA. The results showed that the chemical vapor deposition method allows the deposition of carbon nanotubes with proper distribution of diameters and quality. It was also observed that most of the synthesized carbon nanotubes have open ends that represent the end growth of the carbon nanotubes. Finally the result of mechanical tests indicated that CNTs addition to the cement paste dramatically the increased compressive strength by bridging between cracks and filling pores.

کلیدواژه‌ها [English]

  • Cement
  • Carbon nanotubes
  • Composite
  • Chemical vapor deposition
مراجع
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علوم و فناوری کامپوزیت
دوره 4، شماره 3
آذر 1396
صفحه 295-302
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هم رسانی
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