A Novel Approach For Nanocarbon Composite Preparation
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A Novel Approach For Nanocarbon Composite Preparation Albert G. Nasibulin1, Tatyana Koltsova2, Larisa I. Nasibulina1, Ilya V. Anoshkin1, Alexandr Semencha2, Oleg V. Tolochko2, Esko I. Kauppinen1 1 Department of Applied Physics, Aalto University School of Science, P.O. Box 15100, 00076, Finland 2 Material Science Faculty, State Polytechnical University, Polytechnicheskaya, 29, 195251, Saint Petersburg, Russia ABSTRACT Carbon nanotubes (CNTs), nanofibers (CNFs) and graphene are promising components for the next generation high performance structural and multi-functional composite materials. One of the largest obstacles to create strong, electrically or thermally conductive CNT/CNF composites is the difficulty of getting a good dispersion of the carbon nanomaterials in a matrix. Typically, time-consuming steps of the carbon nanomaterial purification, ultrasound sonication and functionalization are required. We utilized a new approach to grow CNTs/CNFs directly on the surface of matrix, matrix precursor or filler particles. As the precursor matrix and fillers we utilized cement (clinker), copper powder, fly ash particles, soil and sand. Carbon nanomaterials were successfully grown on these materials without additional catalyst. Investigations of the physical properties of the composite materials based on these carbon modified particles revealed enhancement in the mechanical and electrical properties. INTRODUCTION Carbon nanomaterials, such as carbon nanotubes (CNTs), nanofibers (CNFs) and graphene have recently achieved tremendous scientific interest due to their remarkable and useful properties, such as exceptional tensile strength, elastic modulus and electrical and thermal conductivity [1, 2]. These materials are promising candidates for the next generation high performance structural and multi-functional composite materials [3-5]. One of the largest obstacles to create strong, electrically or thermally conductive CNT/CNF composites is the difficulty of obtaining a good dispersion of the carbon nanomaterials in a matrix. Typically, time-consuming steps of the carbon nanomaterial purification, functionalization and mixing with matrix are required. Here, we utilize a new approach to grow CNTs/CNFs directly on the surface of matrix, matrix precursor or filler particles. As the precursor matrix and fillers we utilized cement (clinker), copper powder, fly ash particles, soil and sand. Carbon nanofibers were successfully grown on these materials without additional catalyst. Investigations of the physical properties of the composite materials based on these carbon modified particles revealed enhancement in mechanical and electrical properties. EXPERIMENTAL RESULTS AND DISCUSSION Cement based materials Figure 1 shows the general concept of getting evenly dispersed carbon nanomaterials in the cement (or clinker) precursor matrix. After the synthesis of the carbon nanomaterials on the
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surface of cement particles, the composite materials (hardened cement paste) are obtained by cement hydration process. It is important th
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