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Application of nano graphite prepared by laser to improve the performance of heat sink / Hesham Mohamed Elflaah ; Supervised Yehia Abdelhamid Badr , Mohy Saad Mansour , Tawfik Ismail Tawfik

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Hesham Mohamed El flaah , 2020Description: 126 P. : charts , facimiles ; 25cmOther title:
  • تطبيق النانو جرافيت المحضر بواسطة الليزر لتحسين أداء المبرد الحرارى [Added title page title]
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  • Issued also as CD
Dissertation note: Thesis (Ph.D.) - Cairo University - National Institute of Laser Enhanced Sciences - Department of Lasers Applications in Engineering Summary: The generation of heat without rapid, continues and controlled release causes over-heating of the electronic components which in turn affects the efficiency, working life, and the reliability of the electronic devices.The non-uniform heat distribution in GaN transistors and microprocessors, results in degradation of their performance and poor reliability. The heat generated by LEDs causes efficiency reduction, change in the light color, and reduction of their life time. Accordingly, the need for efficient and novel heat dissipating materials has been emerged as a pressing issue. To reduce this heating, the preparation of polyvinyl-formaldehyde (PVF)/multi walled carbon nanotubes (MWCNTs) foams as efficient heat sink nano composites was presented here, (MWCNTs) has been prepared with laser ablation. The PVF foam was loaded with 1 wt%, 2 wt%, and 4 wt% of MWCNTs.Thermal conductivity of the PVF/MWCNTs foams are investigated within the temperature range 25{u2013} 200 oC. The structure of the pre-pared foams were characterized by Fourier transform infrared (FTIR), Raman spectroscopy, and differential scanning calorimetry (DSC). The results show that the MWCNTs are homogeneously distributed inside the PVF foam and attached to the PVF matrix via van der Waals forces.The addition of the MWCNTs increased the thermal stability of the PVF foam through connecting and filling the pores of the PVF foam.The maximum thermal conductivity value was found to be {u2248}5 W/mK for 4 wt% of PVF/MWCNTs foam at room temperature
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Item type Current library Home library Call number Copy number Status Date due Barcode
Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.24.11.Ph.D.2020.He.A (Browse shelf(Opens below)) Not for loan 01010110082424000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.24.11.Ph.D.2020.He.A (Browse shelf(Opens below)) 82424.CD Not for loan 01020110082424000

Thesis (Ph.D.) - Cairo University - National Institute of Laser Enhanced Sciences - Department of Lasers Applications in Engineering

The generation of heat without rapid, continues and controlled release causes over-heating of the electronic components which in turn affects the efficiency, working life, and the reliability of the electronic devices.The non-uniform heat distribution in GaN transistors and microprocessors, results in degradation of their performance and poor reliability. The heat generated by LEDs causes efficiency reduction, change in the light color, and reduction of their life time. Accordingly, the need for efficient and novel heat dissipating materials has been emerged as a pressing issue. To reduce this heating, the preparation of polyvinyl-formaldehyde (PVF)/multi walled carbon nanotubes (MWCNTs) foams as efficient heat sink nano composites was presented here, (MWCNTs) has been prepared with laser ablation. The PVF foam was loaded with 1 wt%, 2 wt%, and 4 wt% of MWCNTs.Thermal conductivity of the PVF/MWCNTs foams are investigated within the temperature range 25{u2013} 200 oC. The structure of the pre-pared foams were characterized by Fourier transform infrared (FTIR), Raman spectroscopy, and differential scanning calorimetry (DSC). The results show that the MWCNTs are homogeneously distributed inside the PVF foam and attached to the PVF matrix via van der Waals forces.The addition of the MWCNTs increased the thermal stability of the PVF foam through connecting and filling the pores of the PVF foam.The maximum thermal conductivity value was found to be {u2248}5 W/mK for 4 wt% of PVF/MWCNTs foam at room temperature

Issued also as CD

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