Rod-like fluorescent halloysite nanotubes-silica composites: a novel colloidal system
R. Sáncheza, B.M. Marín-Santibañezb, J. Pérez-Gonzálezc, F. Rodríguez-Gonzálezd, and H.J. Dorantes-Rosalese
a Facultad de Física, Universidad Veracruzana, Circuito Gonzalo Aguirre Beltrán s/n, Zona Universitaria, Xalapa 91000, Veracruz, México.
b Sección de Estudios de Posgrado e Investigación, Escuela Superior de Ingeniería Química e Industrias Extractivas, Instituto Politécnico Nacional, U.P.A.L.M. C.P. 07738, Col. S. P. Zacatenco, Del. Gustavo A. Madero, México D.F., México.
c Laboratorio de Reología y Física de la Materia Blanda, Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional, U.P.A.L.M. C.P. 07730, Col. S. P. Zacatenco, Del. Gustavo A. Madero, México D.F., México.
]]> d Departamento de Biotecnología, Centro de Desarrollo de Productos Bióticos, Instituto Politécnico Nacional, C.P. 62731, Col. San Isidro, Yautepec, Morelos, México.e Departamento de Metalurgia y Materiales, Escuela Superior de Ingeniería Química e Industrias Extractivas, Instituto Politécnico Nacional, U.P.A.L.M. C.P. 07738, Col. S.P. Zacatenco, Del. Gustavo A. Madero, México D.F., México.
Received 17 October 2014;
accepted 21 January 2015
Abstract
An inexpensive novel method to produce a rod-like fluorescent colloidal system is presented in this work. The system consists of core-shell particles synthesized by using halloysite nanotubes as cores, and silica layers as shells on their surfaces. Unlike traditional protocols for producing silica core-shell particles, the method used in this work does not require a coupling agent. In addition, a fluorescent dye was incorporated to produce fluorescent composites. Due to their resulting morphology and the possibility of incorporating a fluorescent dye, they constitute a promising new colloidal model system for studying the physics of anisotropic colloidal suspensions experimentally, as well as a potential source of new materials.
Keywords: Nanoclay composites; core-shell particles; halloysite nanotubes; colloidal rods.
]]> PACS: 81.07.De; 81.05.Pj; 83.80.Hj
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Acknowledgments
RS acknowledges Consejo Nacional de Ciencia y Tecnología support (Retención 174462) while carrying out part of the present work, and acknowledges use of SARA-UV facilities at Xico, Veracruz. BMMS, JPG, FRG and HJDR are COFAA-EDI fellows. The authors also acknowledge technical assistance from K. García-Morales.
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