Composite nanofibers nanofiber-nanotube composites

Wiemann K, Kaminsky W, Gojny FH, Schulte K (2005) Synthesis and properties of syndiotactic poly(propylene)/carbon nanofiber and nanotube composites prepared by in situ polymerization with metallocene/MAO catalysts. Macromol Chem Phys 206 1472-1478... 

Lee H, Mall S, He P, Shi DL, Narasimhadevara S, Yeo-Heung Y, Shanov V, Schulz MJ (2007) Characterization of carbon nanotube/nanofiber-reinforced polymer composites using an instrumented indentation technique. Composites Part B 38 58-65... 

A test matrix of about 20 different carbon samples, including commercial carbon fibers and fiber composites, graphite nanofibers, carbon nanowebs and single walled carbon nanotubes was assembled. The sorbents were chosen to represent a large variation in surface areas and micropore volumes. Both non-porous materials, such as graphites, and microporous sorbents, such as activated carbons, were selected. Characterization via N2 adsorption at 77 K was conducted on the majority of the samples for this a Quantachrome Autosorb-1 system was used. The results of the N2 and H2 physisorption measurements are shown in Table 2. In the table CNF is used to designate carbon nanofibers, ACF is used for activated carbon fibers and AC for activated carbon. 

The properties of a nanocomposite are determined by the stmcture and properties of the nanoelements, which form it. One of the main tasks in making nanocomposites is building the dependence of the stmcture and shape of the nanoelements forming the basis of the composite on their sizes. This is because with an increase or a decrease in the specific size of nanoelements (nanofibers, nanotubes, nanoparticles, and so on), their physical— mechanical properties such as coefficient of elasticity, strength, deformation parameter, and so on, are varying over one order [1-5]. 

T. Yang, N. Zhou, Y. Zhang, W. Zhang, K. Jiao, and G. Li, Synergistically improved sensitivity for the detection of specific DNA sequences using polyaniline nanofibers and multi-walled carbon nanotubes composites. Biosens. Bioelectron., 24, 2165—2170 (2009). 

Qi, R. Guo, R. Shen, M. Cao, X. Zhang, L. Xu, J. Electrospun poly (lactic-co-glycolic acid)/halloysite nanotube composite nanofibers for drug encapsulation and sustained release. J. Mater. Chem. 2010, 20 (47), 10622-10629. 

Therefore, it can be seen from the above expression that is closely related to absorption loss (SE ). SE is also important for porous structures (e.g., foams) and for certain type of filled composites (carbon nanofibers [CNFs]/carbon nanotubes [CNTs]/graphene-filled polymers) or for certain design geometries (e.g., honeycomb lattices) [1,2,9,13,81]. It can be neglected in the case of a shield having thick absorbing elements due... 

Motivated by the development of cardiac tissue engineering based on electrically active electrospun nanofibers, Fernandes and co-workers reported on the preparation of electrospun hyperbranched PLL nanofibers containing polyaniline in the form of nanotubes.Both electroactivity and biocompatibility demonstrated by the composite nanofibers opens the possibility of using this material as a scaffold in cardiac tissue engineering. 

Fig.18 PMMA/discotic composite nanofibers prepared inside AAO hard templates, a Nanotube (diameter about 400 nm) with a wall consisting of an outer PMMA layer and an inner (stained) discotic layer b nanorod (diameter 60 nm) with a disordered segmented morphology. Reproduced from [65]. (2005) Wiley-VCH...

Yeo LY, Friend JR (2006) Electrospinnmg carbon nanotube polymer composite nanofibers. J Exp Nanosci 1 177-209... 

It has been established that electrospinning a polymer solution containing well-dispersed carbon nanotubes leads to nanocomposite fibers with the embedded carbon nanotubes oriented parallel to the nanofiber axis due to the large shear forces in a fast fiber-drawing process. Table 1 lists most of the polymer/CNT composite nanofibers produced by electrospining, along with their fiber diameters and tensile properties. 

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