Publicaciones

NANOTECNOCIENCIA: Nociones preliminares sobre el universo nanoscópico. El libro es editado por Jairo Giraldo, Presidente de la Asociación Buinaima, Edgar González, Director de nanoCiTec y Fernando Gómez Baquero, Gerente de Nanocolombia. La publicación fué realizada por la Asociación Colombiana Buinaima, Nanocolomgia, el IEEE CNNN y Nanocitec.
____________________________
2008
Trabajos aceptados y en proceso de publicación
Cytotoxicity in Vitro for photothermolysis with carbon nanotubes functionalized with poly(ethylene glycol)
E. González a b, E. Gila d, C. de Castroa c, N. Téllez a d, T. Riberos, F. González a
aNanoscalar Center of Science and Technology, Bogotá, Colombia
b Departament of Physics, Javeriana University Bogotá Colombia
cMedical Faculty San Martín University, Bogotá, Colombia
dDepartament of Chemistry, Javeriana University Bogotá Colombia
Abstract
Taking advantage of the carbon nanotubes thermal and optical properties, it is possible to orient it utilization to develop strategies of controlled carcinogenic cells death by photothermolysis, although is necessary to increase the investigative efforts to accomplish enough nanostructures toxicity information in biological environments.
In this work are investigated with and without radiation laser inVitro the cytotoxicity effects of the water-soluble composed: single walled carbon nanotubes functionalized with poly(ethylene glycol).
The cytotoxicity effect in Vitro is determined through cell viability experiments using the method MTT: Bromide of 3-(4,5-dimetiltiazol-2-ilo)-2,5- difeniltetrazolio, which measures the mitochondrial function. These viability experiments are developed with breast MCF7 tumoral cell line.
The effects of cytotoxicity of tumoral cells cultivations with pristine carbon nanotubes are investigated to develop a comparative study with carbon nanotubes functionalized.
Keywords: Cytotoxicity, carbon nanotubes, nanophototerapy, nanotechnology.
________________________
Synthesis of carbon nanotubes by microwave radiation
E. Gonzáleza b, F. Gonzáleza c
aNanoscalar Center of Science and Technology, Bogotá, Colombia
bDepartament of Physics, Javeriana University Bogotá Colombia
cChemical Engineering Faculty , Universidad Nacional del Litoral, Santafé, Argentina
Abstract
Although at the present time a variety of methods and techniques exist for the synthesis and functionalization of carbon nanotubes, it is necessary to explore alternatives to improve the selective and homogeneous heating of the samples and to reduce the times to complete the processes. With radiation for microwaves an important option opens up to fulfill these requirements, besides being projected as a method for the production of aligned carbon nanotubes in multi-layers that can be valuable for investigation, specifically in the biosensors design, purification systems, nanosystems of cathodic emission, catalytic electrodes for cells of fuel, etc. In this work is carried out a revision of the microwaves radiation use for the production and functionalization of carbon nanotubes and the synthesis of carbon nanotubes by microwaves is reported with the use of silver nitrate like catalyst.
Keywords: Carbon nanotubes, nanotechnology, microwave, synthesis
_________________________
SINTESIS Y CARACTERIZACIÓN DE NANOTUBOS Y NANOFIBRAS DE CARBONO RECTAS, CURVAS Y MORFOLOGIAS TIPO-Y BAMBOO Y ESPIRAL
E. Gonzalezabd, C. Quinteroac, A. Castañedaac
aCentro de Ciencia y Tecnología Nanoescalar, Bogotá, Colombia.
bFacultad de Ingeniería Electrónica , Universidad Santo Tomás, Bogotá, Colombia.
cDepartamento de Ingeniería Electrónica, Universidad Javeriana, Bogotá, Colombia
dDepartamento de Física, Universidad Javeriana, Bogotá, Colombia.
Resumen
La producción y caracterización de nanoestructuras de carbono con diferentes tipos de organización estructural, se proyecta como una de las áreas estratégicas para el desarrollo de nuevos materiales, nanosensores, pilas de combustible y dispositivos electrónicos inscritos dentro de la naciente revolución nanoescalar. La síntesis de flama resulta económica y produce nanoestructuras de carbono de gran calidad estructural y morfologías diversas que pueden ser controladas con temperatura y tipo de partículas catalíticas. En este trabajo se reporta el diseño y construcción de un reactor de flama para la sintetisis y caracterización de nanofibras y nanotubos de carbono. Sobre sustrato de molibdeno con niquel y cobalto como catalizadores se obtienen nanofibras y nanotubos de carbono rectos, curvos y tipo bamboo. Para nanofibras se identifican junturas tipo Y y morfologías rectas, espirales y helicales. Para nanotubos de carbono se observan morfologías rectas, curvas y tipo bamboo. Se caracterizan con microscopía HRTEM las disposiciones de los planos grafenales los cuales corresponden a una organización cristalográfica para las nanofibras de tipo platelet, fishbone y herrinbone. Con microscopía SEM se estudia la distribución de tamaños y distribución de partículas catalíticas, así como el crecimiento de las nanofibras y nanotubos sobre el sustrato.
Palabras Clave: Nanotecnología, nanotubos de carbono, nanofibras de carbono, síntesis
__________________________
Mechanisms and modeling of growing carbon nanotubes with Y, like-bamboo and helicoidal morphologies
E. González, C. Quintero, A. Castañeda,
Departament of Physics, Javeriana University Bogotá Colombia
Nanoscalar Center of Science and Technology, Bogotá, Colombia
Departament of Electronic Engineering, Javeriana University, Bogotá, Colombia.
Abstract
Eventhough modern technology includes a variety of methods and techniques for the synthesis of carbon nanotubes the state of art is still insufficient to explain and model the processes that take place in the formation and growing of nanotubes and the parameters related with the formation of these entities. The importance of the development of models oriented to the prediction of experimental results relative to the morphology and properties of carbon nanotubes, that allow the design and adjustment of conditions regarding the catalytic techniques in order to get closer to the idea of much more controlled synthesis of carbon nanotubes, is recognized. In this document some of the mechanisms with the production of carbon nanotubes with Y, like-bamboo and helicoidal morphologies obtained with catalytic particles are analyzed.
Keywords: Carbon nanotubes, modeling, growing
______________________
Cytotoxicity in Vitro for nanophotothermolysis with carbon nanotubes functionalized with poly(m-aminobenzene sulfonic acid)
E. González a b, E. Gila d, C. de Castroa c, N. Téllez a d, T. Riberos, F. González a
aNanoscalar Center of Science and Technology, Bogotá, Colombia
b Departament of Physics, Javeriana University Bogotá Colombia
cMedical Faculty San Martín University, Bogotá, Colombia
dDepartament of Chemistry, Javeriana University Bogotá Colombia
ABSTRACT
In this work are investigated the in vitro cytotoxic effects with and without laser radiation of the water soluble composed: single wall carbon nanotubes functionalized with poly(m-aminobenzene sulfonic acid). The cytotoxicity effect in vitro is determined through cell viability test MTT. These test of viability are carried out with two tumoral cellular lines: 1595 and colo-255.
Keywords: Cytotoxicity, carbon nanotubes, nanophototerapy, nanotechnology.
____________________
IN VITRO CYTOTOXICITY WITH SINGLE WALL CARBON NANOTUBES FUNCTIONALIZED WITH POLY(M-AMINOBENZENE SULFONIC ACID) AND POLY(ETHYLENE GLYCOL).
E. González a b, E. Gila d, C. de Castroa c, N. Téllez a d, T. Riberos, F. González a
aNanoscalar Center of Science and Technology, Bogotá, Colombia
b Departament of Physics, Javeriana University Bogotá Colombia
cMedical Faculty San Martín University, Bogotá, Colombia
dDepartament of Chemistry, Javeriana University Bogotá Colombia
ABSTRACT
Taking advantage of the optic and thermal properties of carbon nanotubes, it becomes possible to orient it utilization to develop strategies of controlled carcinogenic cells death by photothermolysis, although it is required to increase the investigative efforts to have enough information about the toxicity of these nanostructures in biological environments. In this work are investigated the in vitro cytotoxic effects with and without laser radiation of the water soluble composed: single wall carbon nanotubes functionalized with poly(m-aminobenzene sulfonic acid) and single wall carbon nanotubes functionalized with poly(ethylene glycol). The cytotoxicity effect in vitro is determined through cell viability test MTT. These test of viability are carried out with two tumoral cellular lines: colo-205 and CSC3322.
Keywords: Cytotoxicity, carbon nanotubes, nanophototerapy, nanotechnology.
_______________________
Propiedades mecánicas y térmicas de nanotubos de carbono para uso en ambientes biológicos
E. González
Departamento de Física, Universidad Javeriana, Bogotá, Colombia.
Centro de Ciencia y Tecnología Nanoescalar nanoCiTec, Bogotá, Colombia.
Resumen
Aprovechando las propiedades mecánicas, ópticas y térmicas de los nanotubos de carbono, se hace posible orientar su utilización en sistemas biológicos como herramientas termoterapéuticas, de diagnóstico, de reforzamiento de estructuras óseas y músculos artificiales. En esta revisión, se evalúan las potenciales aplicaciones de los nanotubos de carbono, así como los efectos citotóxicos en ambientes biológicos, aspecto que resulta crucial para recorrer el camino hacia el uso de estas entidades en futuros tratamientos clínicos.
Palabras Clave: Nanotubos de carbono, propiedades mecánicas, propiedades térmicas, bionanotecnología.
_________________________________
LECCIONES DE LA NATURALEZA
El efecto loto: inspiración para la nanotecnología
Edgar González
Centro de Ciencia y Tecnología Nanoescalar “nanoCiTec”
Grupo de Nanociencia, Universidad Javeriana
Grupo de Modelamiento y Manufactura Nanoescalar, Universidad Santo Tomás
edgar.gonzalez@nanocitec.org
Resumen.
La escasa adherencia y fricción del agua depositada sobre ciertas superficies de origen biológico se ha convertido en una fuente de inspiración para la manufactura de materiales nanoestructurados con autonomía de limpieza y protección. |