Research on the dispersion of carbon nanotubes by ultrasonic oscillation, surfactant and centrifugation respectively and fiscal policies for its industrial development

Abstract

Carbon nanotubes (CNTs) have attracted wide attention because of their unique structure and properties. However, the prepared CNTs often present agglomeration state, which destroys the excellent properties of single carbon nanotubes and seriously affects the application of carbon nanotubes. How to effectively disperse carbon nanotubes has become an urgent problem to be solved. There are many factors affecting the dispersion of carbon nanotubes. In this paper, the effects of three aspects of surfactant, ultrasonic oscillation and centrifugation on the dispersion of carbon nanotubes and fiscal policies for the development of nano high-tech industry are mainly studied.

Applications of Cement-Based Smart Composites to Civil Structural Health Monitoring: A Review

“…The most frequently adopted surfactants are methylcellulose (MC), polycarboxylate-based (PC) superplasticizers, anionic sodium dodecyl benzene sulfonate (SDBS) and lignosulfonate (LS). Consistent and conclusive findings about the effectiveness of covalent and non-covalent dispersion methods are not available in the literature [51], also because of the influence of different types of fillers and mixing proportions on the results. It can be only argued that, if the mechanical properties of CSC are relevant with respect to the scope of the application, non-covalent methods are preferable although they do not ensure absolute best sensing performance.…”

Electromagnetic Shielding Effectiveness and Conductivity of PTFE/Ag/MWCNT Conductive Fabrics Using the Screen Printing Method

“…A well-dispersion of 4 wt% MWCNT was prepared by combining a specific weight of gum arabic (GA, 0.14 g), poly(acrylic acid sodium salt) (PAAS, 0.06 g), isopropyl alcohol (IPA, 9.6 g), and MWCNTs (0.4 g) in ultrasonic and planetary centrifugal mixers (Figure 1) [20,21]. Ten grams of conductive Ag/MWCNT composite paste were used for the preparation and formulation processes shown in Figure 2 and Table 1.…”

Direct injection of SWCNTs into liquid after supercritical nitrogen treatment

“…High quality SWCNT dispersions, containing either individual tubes or small bundles, are of a great importance for many technological applications, including biosensors, optical devices and conductive films [1]. However, strong van der Waals interaction between tubes together with their large surface area and high aspect ratio force SWCNTs to form bundles to minimize their free surface energy [2,3,4]. Several techniques are used to prepare homogeneous dispersions of SWCNTs in aqueous solutions.…”