The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A systematic study on mechanics of carbon nanofibers (CNF) in relation to their microstructure is presented. The CNFs were fabricated via pyrolysis of polymeric nanofibers. In order to develop super-strong and super-tough one-dimensional nanomaterials, processing steps were aimed at reducing defects, e.g., poor graphitic alignment. The degree of graphitization was optimally controlled to benefit from...
Piezoelectric polymeric nanofibers, such as P(VDF-TrFE), are promising nanostructures for sensing/actuation applications where flexibility of the component is required, for example soft robotics, conformal sensors, and energy harvesting devices. A challenge in polymeric piezoelectric materials is that their electromechanical coupling efficiency must be improved to approach that of bulk piezo ceramics...
The electromechanical coupling behavior in piezoelectric polymers strongly depends on their morphology. The electromechanical coupling is defined as the conversion between electrical energy and mechanical energy in piezoelectric materials. Geometry (nanofibers, films, etc.) as well as fabrication methods, and post-processing affect crystallinity, orientation, and size of the crystallites, and alignment...
Electrospun carbon nanofibers (CNFs) processed via carbonization of electrospun precursors are an emerging class of nanoscale carbon-based materials with abundant sp2 CC bonds which can offer significant opportunities for structural light-weighting in multifunctional materials. In this work, we have studied the effect of graphitic alignment on mechanical properties of CNFs. Graphitic alignment was...
Piezoelectric polymers (PVDF and its co-polymers) in film and nanofiber forms are increasingly used for sensing, actuation and energy harvesting. Given the semi-crystalline structure of these polymers, their electromechanical coupling behavior changes with thermomechanical processing. This article reports on the evolution of the mechanical properties, piezoelectric properties and morphology of P(VDF-TrFE)...
To unravel reinforcing effect of CNTs in polymeric nanofibers, polyacrylonitrile (PAN)/SWNTs nanofibers with various CNTs content (0.1–0.5 wt%) were electrospun. Nanofibers were hot-drawn to enhance PAN chains and SWNT alignment. The microstructure of composite nanofibers was studied via polarized Raman and IR spectroscopy, x-ray diffraction, and TEM imaging. The study pointed to a marked contribution...
Piezoresistive behavior of individual electrospun carbon nanofibers (CNF) was studied for the first time via a microelectromechanical systems platform. The gage factor of CNFs was found to vary from 1.96 to 2.55, not correlating with nanofiber diameter. The measured strain sensitivity of electrical resistance of individual CNFs could not be solely explained based on strain induced dimensional changes...
Two types of multi-walled carbon nanotubes (MWCNTs) functionalized with different amino-organics, dicyanodiamide and phenylbiguanide, respectively, were achieved in this paper. The physico-chemical properties of MWCNTs before and after amino group modification were characterized by thermogravimetric analysis (TGA), Raman spectroscopy and inverse gas chromatography (IGC). The results showed that amino-functionalization...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.