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  • Công bố khoa học và công nghệ Việt Nam

81.09.13

Kỹ thuật vật liệu và luyện kim

Nghiên cứu ứng dụng lớp phủ chắn sóng điện từ trên cơ sở compozit pha trộn ống nano cacbon

Study and application on electromagnetic shielding based on the blend of composites and carbon nanotubes

Khoa học và Công nghệ Việt Nam

2013

20

44-51

1859-4794

Multi walled carbon nanotubes (MWCNT) have filled epoxy and polymer (polymethyl methacrylate, polyurethane) (PMMA, PU) coatings prepared by mechanical grinding with the use of a planetary ball mill. Electromagnetic shielding effectiveness, electromagnetic absorption and reflection properties of the materials have been investigated according to the standard 41 TQSB 71:2004 by a network analyzer (HP E8363B). The experimental results showed that at MWCNT loadings higher than 25 wt. percent, epoxy/MWCNT and PMMA, PU coatings have also exhibited the full capability of shielding more than 99 percent electromagnetic radiation at the 100 MHz-126Hz frequency range. According to the safety standard of electromagnetic exposure TCVN 3718-1:2005 of Ministry of Infomation and Communications the allowed values of energy flux density (S) is less than 2 W/m2, so these coating layers will ensure safety for people andequipment working in areas where S is outmarch security level by ten times.

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