Abstracts Book - IMRC 2018

• SF5-P073
OBTAINING PH-SENSITIVE HYBRID SILICA-CHITOSAN
NANOPARTICLES FOR BIOSENSORS
Daniela Jazmín Hernández Castillo 1 , Mayra Angelica Alvarez Lemus 1 , Erick Natividad de la Cruz
Hernández 2 , Patricia Quintana Owen 3
1 Universidad Juárez Autónoma de Tabasco, División Académica de Ingeniería y Arquitectura,
Mexico. 2 Universidad Juárez Autónoma de Tabasco, División Académica Multidisciplinaria de
Comalcalco, Mexico. 3 CINVESTAV-Mérida, Departamento de Física Aplicada, Mexico.
Silicon dioxide, SiO 2 , is an inorganic compound that due to its high surface area
has been used in medical, technological, environmental and food applications.
In this work, silicon dioxide nanoparticles were synthesized by Stöbers method.
The morphology of the nanoparticles was modified by the addition of sodium
carbonate, Na 2 CO 3 . This modification increased the surface area 89 m 2 /g for
pure silica, to 154 m 2 /g and 115 m 2 /g for the modified silica. However, the pore
diameter showed changes with respect to the aging time of the samples going
4 to 7 nm. The characterization by scanning electron microscopy showed a
spherical and porous morphology of the nanoparticles as well as a good
dispersion and variation of sizes in a range 200 to 436 nm. Vibrations of the Si-
O-Si bonds were analyzed by FT-IR and the bands located at 1100 and 480 cm -1
confirmed the presence of silica, whereas addition of chitosan was observed
since bands centered at 1621 cm-1 can be associated to amino groups. The X-
ray diffraction analysis at low angle confirmed formation of amorphous
materials. Nanoparticles were coated with Chitosan because it is a natural
biopolymer sensitive to pH and temperature; therefore, the performance of SiO 2
can be optimized. This can be used as support for immobilization of biosensitive
molecules for sensing of toxic compounds in the environment.
Acknowledgment:
This work was supported by the Nanotechnology Laboratory of Science and
Technology Research Center of Tabasco for the use of laboratories and
equipment. In the same way, to National Laboratory of Nano and Biomaterials
of Merida for the support provided me during the physicochemical
characterizations.
Keywords: Mesoporous silica nanoparticle, Chitosan, pH response
Presenting authors email: djaznmin_07@hotmail.com