تاثیر عاملدارسازی به وسیله هیدروژن بر خواص حرارتی نانولوله های کربنی فنری

نوع مقاله : مقاله مکانیک

نویسندگان

1 دانشجو، دانشکده مهندسی مکانیک، دانشگاه تهران

2 دانشیار، دانشکده مهندسی مکانیک، دانشگاه بین المللی امام خمینی قزوین

3 دانشیار، دانشکده مهندسی مکانیک، دانشگاه تهران

چکیده

ساخت مواد جدید برای کنترل انتقال حرارت همواره مورد توجه بوده است. نانومواد مبتنی بر کربن به دلیل ویژگی‌های حرارتی فوق‌العاده‌ای که دارند، کاندیدای امیدوارکننده‌ای برای انتقال حرارت بوده‌اند. نانولوله‌های کربنی فنری(CCNT)، جزو نانو ساختارهای کربنی مصنوعی هستند که اغلب به دلیل دارا بودن خواص مکانیکی ویژه از جمله کشش پذیری زیاد و خواص حرارتی خوب در کاربردهای فراوانی همچون ساخت نانودستگاه‌ها و یا ساخت نانوکامپوزیت‌های پیشرفته با خواص ترمومکانیکی ویژه به کار می‌روند. در این پژوهش با استفاده از تکنیک شبیه سازی دینامیک مولکولی و با روش دینامیک مولکولی غیر تعادلی به بررسی تاثیر عاملدارسازی با هیدروژن با درجه های هیدروژن دار سازی 0، 5، 15و30 درصد بر خواص حرارتی نانولوله‌های فنری پرداخته شده است. نتایج نشان می‌دهد که رسانایی حرارتی CCNT‌ها به شدت تحت تاثیر عاملدارسازی قرار می‌گیرد. بطوریکه با 5 درصد عاملدار کردن آنها تقریبا ضریب رسانایی حرارتی آن‌ها 50 درصد کاهش می‌یابد. همچنین برخلاف سایر نانو ساختارهای کربنی با افزایش درجه عاملدارسازی در CCNT‌ها رسانایی حرارتی روند نزولی نخواهد داشت بطوریکه ضریب رسانایی حرارتی CCNT‌‌های 30 درصد هیدروژن دار شده بیشتر از نمونه‌های هیدروژن دار شده با درصدهای کمتر است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The effect of hydrogen functionalization on the thermal properties of coiled carbon nanotubes

نویسندگان [English]

  • Mahdi Azhari 1
  • Ali Rajabpour 2
  • Majid Baniassadi 3
1 School of Mechanical Engineering, College of Engineering, University of Tehran, Iran.
2 Imam Khomeini International University, Qazvin, Iran.
3 College of Engineering, University of Tehran, Iran.
چکیده [English]

Making new materials to control heat transfer has always been of interest. Carbon-based nanomaterials are promising for heat transfer due to their excellent thermal properties. Coiled carbon nanotubes (CCNTs) are among artificial carbon nanostructures due to their special mechanical properties, including high stretchability and good thermal properties are often used in many applications such as making nanodevices or advanced nanocomposites. In this research, using the molecular dynamics simulation technique and non-equilibrium molecular dynamics method, the effect of hydrogen functionalization with hydrogenation percentages of 5, 15, and 30% on the thermal properties of spring nanotubes has been investigated. The results show that the thermal conductivity of CCNTs is strongly affected by functionalization. So that by functionalizing them by 5%, their thermal conductivity coefficient decreases by 50%. Also, unlike other carbon nanostructures, the thermal conductivity of CCNTs does not decrease with the increase in the degree of functionalization, so the coefficient of thermal conductivity of 30% hydrogenated CCNTs is higher than the hydrogenated samples with lower percentages

کلیدواژه‌ها [English]

  • Carbon nanostructures
  • Coiled nanotubes (CCNT)
  • Thermal properties
  • Non-equilibrium molecular dynamics

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مدل سازی در مهندسی
دوره 21، شماره 74
آبان 1402
صفحه 153-162

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سابقه مقاله

  • تاریخ دریافت: 02 بهمن 1401
  • تاریخ بازنگری: 06 فروردین 1402
  • تاریخ پذیرش: 13 اردیبهشت 1402

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