METHOD FOR FUNCTIONALIZING AND DISPERSING CARBON NANOTUBES IN A MATRIX

• Main Authors: HECTOR RAFAEL SILLER CARRILLO, ALEX ELIAS ZUÑIGA, JOSE ANTONIO SANCHEZ FERNANDEZ, CIRO ANGEL RODRIGUEZ GONZALEZ
• Format: Patent
• Language: English; Spanish
• Published: 25.06.2014
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT THEREOF; METALLURGY; NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS,MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES ASDISCRETE UNITS; NANOTECHNOLOGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; TRANSPORTING

The multiple-wall carbon nanotubes were oxidized and functionalized with the purpose of determining the structural and chemical changes suffered over the atomic bond thereof. The oxidation was performed in an aqueous dissolution of nitric acid (HNO3) between 50% and 70%, and sulfuric acid (H2SO4) between 80% and 95% at a temperature of from about 20°C to about 50°C. The oxidized and non-oxidized carbon nanotubes were characterized by Scanning Electron Microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and Thermogravimetric analysis (TGA). The oxidized and non-oxidized carbon nanotubes were functionalized with silane groups 3-glicidoxi propyltrimethoxisilane or triethoxy (octil) silane and incorporated to a polymeric matrix, preferably methyl polymethacrylate (PMMA). Resistivity results are obtained, which turn the invention into nanotubes useful to be applied in microdevices, biomedical devices and industrial sensing systems. Los nanotubos de carbono de pared múltiple fueron oxidados y funcionalizados con el fin de determinar los cambios estructurales y químicos sobre su enlace atómico. La oxidación se realizó en una disolución acuosa de ácido nítrico (HNO3) entre 50% y 70%, y ácido sulfúrico (H2SO4) entre 80% y 95% y a una temperatura entre 20 a 50° C. Los nanotubos de carbono oxidados y no oxidados se caracterizaron por microscopía electrónica de barrido (SEM), espectroscopia infrarroja por transformadas de Fourier (FTIR), espectroscopía Raman y análisis Thermogravimétrico (TGA). Los nanotubos de carbono oxidados y no oxidados fueron funcionalizados con grupos silano 3- glicidoxipropiltrimetoxisilano o trietoxi(octil)silano e incorporados a una matriz polimerica, preferentemente polimetacrilato de metilo (PMMA). Obteniendo resultados de resistividad que los hacen útiles para aplicaciones de microdispositivos, dispositivos biomédicos y sistemas de sensoramiento industrial.