PROCESS FOR THE CONTINUOUS, LARGE-SCALE SYNTHESIS OF CARBON NANOTUBES ON CEMENT CLINKER, AND NANOSTRUCTURED PRODUCTS

• Main Authors: DE OLIVEIRA, SERGIO, ORLANDO LADEIRA, LUIZ, GRIBEL LACERDA, RODRIGO, LORENCON, EUDES, ELETO DA SILVA, EDELMA, SANTAROSA FERLAUTO, ANDRE, DE SOUZA AVILA, ERICK
• Format: Patent
• Language: English; French; Portuguese
• Published: 05.11.2009
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS THEREOF; CONCRETE; INORGANIC CHEMISTRY; LIME, MAGNESIA; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; NANOTECHNOLOGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; REFRACTORIES; SLAG; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF NATURAL STONE

The present invention describes a chemical vapour deposition method for the synthesis of carbon nanotubes, in which method cement clinker is used as a ceramic matrix to catalyse the process or to anchor transition metal nanoparticles. The use of cement clinker as a substrate to anchor transition metal nanoparticles allows the generation of carbon nanotubes on particles and grains of cement clinker, and thus allows the production of a type of nanostructured cement with carbon nanotubes in which the synthesis and integration of carbon nanotubes in the clinker are performed in a single continuous step on a large scale. The invention also proposes, as part of the process of synthetising carbon nanotubes on cement clinker, various options to enrich the latter with transition metals in order to integrate optionally the production of said nanostructured composite into the conventional cement industry. La présente invention concerne un procédé de dépôt chimique en phase vapeur pour la synthèse de nanotubes de carbone, consistant à utiliser du clinker de ciment comme matrice céramique catalysant le procédé ou comme support d'ancrage de nanoparticules de métaux de transition. L'utilisation du clinker de ciment comme support d'ancrage de nanoparticules de métaux de transition permet de former les nanotubes de carbone sur les particules et les grains du clinker de ciment, ce qui permet de produire un type de ciment nanostructuré à nanotubes de carbone, la synthèse et l'intégration des nanotubes de carbone dans le clinker étant réalisées en une seule étape, de manière continue et à large échelle. L'invention concerne également, comme partie du procédé de synthèse de nanotubes de carbone sur le clinker de ciment, diverses solutions alternatives d'enrichissement de ce dernier avec des métaux de transition, en vue d'une éventuelle intégration de la production de ce composite nanostructuré dans l'industrie classique du ciment. A presente invenção descreve um processo de deposição química da fase vapor para a síntese de nanotubos de carbono, no qual o clínquer de cimento e usado como matriz ceramica catalisadora do processo ou como ancoramento de nanopartículas de metais de transição. A utilização do clínquer de cimento como suporte de ancoramento de nanoparticulas, de metais de transição permite que os nanotubos de carbono sejam gerados sobre as particulas, e grãos do clínquer de cimento permitindo assim, a produção de um tipo de cimento nanoestruturado com nanotubos de carbono em que a síntese e integração de nanotubos de carbono ao clínquer são feitos em uma ?nica etapa de modo continuo e em larga escala. O invento propõe, também, como parte do processo de sintese de nanotubos de carbono sobre o clinquer de cimento várias alternativas de enriquecimento do mesmo com metais de transição para a produção deste comp?sito nanoestruturado de forma integrada ou não à indústria convencional de cimento.