Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: The influence of the dispersion method on the electrical properties of vapor-grown carbon nanofiber/epoxy composites | Cardoso et al. Nanoscale Research Letters 2011 6 370 http content 6 1 370 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access The influence of the dispersion method on the electrical properties of vapor-grown carbon nanofiber epoxy composites 3 I A z- 2 2 24 Paulo Cardoso 1 Jaime Silva 1 Donald Klosterman José A Covas Ferrie WJ van Hattum Ricardo Simoes and Senentxu Lanceros-Mendez1 Abstract The influence of the dispersion of vapor-grown carbon nanofibers VGCNF on the electrical properties ofVGCNF Epoxy composites has been studied. A homogenous dispersion of the VGCNF does not imply better electrical properties. In fact it is demonstrated that the most simple of the tested dispersion methods results in higher conductivity since the presence of well-distributed nanofiber clusters appears to be a key factor for increasing composite conductivity. PACS Introduction Epoxy resins have a wide range of applications in materials science 1 . By incorporating high aspect ratio fillers like carbon nanotubes CNT 2 or vapor-grown carbon nanofibers VGCNF 3 the epoxy mechanical and electrical properties are enhanced and the range of applications is extended. The VGCNF electrical and mechanical properties are relatively lower than those obtained with CNT but on the other hand they have significant lower cost and are more easily available 3 . VGCNF can be prepared with diameters in the nanometer scale resulting in high aspect ratios such as the Pyrograf III nanofibers Applied Sciences Inc Cedarville OH USA which are a highly graphitic form of VGCNF with stacked-cup morphology 4 . The focus of recent research related to VGCNF epoxy composites has been on the development of processing methods able to generate a homogenous dispersion of the VGCNF within the polymer matrix. For instance Allaoui et al. 5 prepared VGCNF epoxy composites using a combination of ultrasonication and mechanical mixing .
