Abstract
The effects of noncovalent bonding and mechanical interlocking of carbon nanotubes (CNT) coating on tensile and interfacial strength of glass fiber were investigated. CNT were coated over glass fiber by a simple dip coating method. Acid treated CNT were suspended in isopropanol solution containing Nafion as binding agent. To achieve uniform distribution of CNT over the glass fiber, an optimized dispersion process was developed by two parameters: CNT concentration and soaking time. CNT concentration was varied from 0.4 to 2 mg/mL and soaking time was varied from 1 to 180 min. The provided micrographs demonstrated appropriate coating of CNT on glass fiber by use of CNT-Nafion mixture. The effects of CNT concentration and soaking time on coating layer were studied by performing single fiber tensile test and pull-out test. The obtained results showed that the optimum CNT concentration and soaking time were 1 mg/mL and 60 min, respectively, which led to significant improvement of tensile strength and interfacial shear stress. It was found that, at other concentrations and soaking times, CNT agglomeration or acutely curly tubes appeared over the fiber surface which caused a reduction of nanotubes interaction on the glass fiber.
Highlights
IntroductionBoth single walled and multiwalled, are widely used and well characterized as nanofillers [1]
Carbon nanotubes, both single walled and multiwalled, are widely used and well characterized as nanofillers [1]
The surface of neat Glass fiber (GF) was smooth in nature while the coating with 0.4 mg/mL carbon nanotubes (CNT) concentration showed a thin and nonuniform coating on the GF surface
Summary
Both single walled and multiwalled, are widely used and well characterized as nanofillers [1]. Various researches have been done to coat CNT on carbon fiber by use of chemical vapor deposition (CVD) [16, 17] or electrophoretic methods [18] with much success. Solution dip coating method [20] is considered as a suitable alternative method to coat CNT on GF Different parameters such as solvent media, filler concentration, and coating time are important factors in order to provide effective coverage of nanotubes on GF. SEM images were used to identify the CNT morphology deposited on the surface of GFs. The effects of nanotubes coverage on mechanical properties of GFs were demonstrated by performing single fiber tensile and pull-out tests. By comparing the SEM images and mechanical properties, a relationship between CNT coating and tensile and interfacial characteristics of GF was interpreted
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