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Papers by Patricia Santiago

Research paper thumbnail of Size controlled gold nanoparticle formation by Avena sativa biomass: use of plants in nanobiotechnology

Journal of Nanoparticle Research, 2004

Oat (Avena sativa) biomass was studied as an alternative to recover Au(III) ions from aqueous sol... more Oat (Avena sativa) biomass was studied as an alternative to recover Au(III) ions from aqueous solutions and for its capacity to reduce Au(III) to Au(0) forming Au nanoparticles. To study the binding trend of Au(III) to oat and the possible formation of Au nanoparticles, the biomass and a solution of Au(III) were reacted for a period of 1 h at pH values ranging from 2 to 6. The results demonstrated that Au(III) ions were bound to oat biomass in a pH-dependent manner, with the highest adsorption (about 80%) at pH 3. HRTEM studies showed that oat biomass reacted with Au(III) ions formed Au nanoparticles of fcc tetrahedral, decahedral, hexagonal, icosahedral multitwinned, irregular, and rod shape. To our knowledge, this is the second report about the production of nanorods as a product of the reaction of a Au(III) solution with a biological material. These studies also showed that the pH of the reaction influenced the nanoparticle size. The smaller nanoparticles and the higher occurrence of these were observed at pH values of 3 and 4, whereas the larger nanoparticles were observed at pH 2.

Research paper thumbnail of Synthesis of nanostructured metals and metal alloys from organometallics

Coordination Chemistry Reviews, 2000

Research paper thumbnail of Synthesis of acicular iron oxide nanoparticles and their dispersion in a polymer matrix

Journal of Materials Science, 2001

An alternative forced hydrolysis approach for the synthesis of β-FeOOH of varying dimensions was ... more An alternative forced hydrolysis approach for the synthesis of β-FeOOH of varying dimensions was achieved. The β-FeOOH particles were converted into γ-Fe2O3 in a colloidal process, which eliminated the agglomeration of γ-Fe2O3 particles. The acicular γ-Fe2O3 nanoparticles could be readily dispersed into an organic solvent. Preliminary studies have demonstrated that the dispersion of the γ-Fe2O3 nanorods in a polymer matrix is feasible leading to an organic-inorganic nanocomposite.

Research paper thumbnail of Actividad 4.1

Con base en el texto de Carvajal, analiza las etapas por las que ha pasado la educación superior ... more Con base en el texto de Carvajal, analiza las etapas por las que ha pasado la educación superior a partir de los retos que este sistema tiene frente a la satisfacción de la demanda de educación superior, la diversificación de alternativas y la gestión de los sistemas educativos.

Research paper thumbnail of Size controlled gold nanoparticle formation by Avena sativa biomass: use of plants in nanobiotechnology

Journal of Nanoparticle Research, 2004

Oat (Avena sativa) biomass was studied as an alternative to recover Au(III) ions from aqueous sol... more Oat (Avena sativa) biomass was studied as an alternative to recover Au(III) ions from aqueous solutions and for its capacity to reduce Au(III) to Au(0) forming Au nanoparticles. To study the binding trend of Au(III) to oat and the possible formation of Au nanoparticles, the biomass and a solution of Au(III) were reacted for a period of 1 h at pH values ranging from 2 to 6. The results demonstrated that Au(III) ions were bound to oat biomass in a pH-dependent manner, with the highest adsorption (about 80%) at pH 3. HRTEM studies showed that oat biomass reacted with Au(III) ions formed Au nanoparticles of fcc tetrahedral, decahedral, hexagonal, icosahedral multitwinned, irregular, and rod shape. To our knowledge, this is the second report about the production of nanorods as a product of the reaction of a Au(III) solution with a biological material. These studies also showed that the pH of the reaction influenced the nanoparticle size. The smaller nanoparticles and the higher occurrence of these were observed at pH values of 3 and 4, whereas the larger nanoparticles were observed at pH 2.

Research paper thumbnail of Synthesis of nanostructured metals and metal alloys from organometallics

Coordination Chemistry Reviews, 2000

Research paper thumbnail of Synthesis of acicular iron oxide nanoparticles and their dispersion in a polymer matrix

Journal of Materials Science, 2001

An alternative forced hydrolysis approach for the synthesis of β-FeOOH of varying dimensions was ... more An alternative forced hydrolysis approach for the synthesis of β-FeOOH of varying dimensions was achieved. The β-FeOOH particles were converted into γ-Fe2O3 in a colloidal process, which eliminated the agglomeration of γ-Fe2O3 particles. The acicular γ-Fe2O3 nanoparticles could be readily dispersed into an organic solvent. Preliminary studies have demonstrated that the dispersion of the γ-Fe2O3 nanorods in a polymer matrix is feasible leading to an organic-inorganic nanocomposite.

Research paper thumbnail of Actividad 4.1

Con base en el texto de Carvajal, analiza las etapas por las que ha pasado la educación superior ... more Con base en el texto de Carvajal, analiza las etapas por las que ha pasado la educación superior a partir de los retos que este sistema tiene frente a la satisfacción de la demanda de educación superior, la diversificación de alternativas y la gestión de los sistemas educativos.

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