Perales-Perez O. – TechConnect Briefs

Structural and Thermo-Mechanical Characterization of Calcium and Barium Alginate Films

Vidal-Urquiza T.K., University of Puerto Rico, PR

Alignate films require its precise characterization of mechanical and thermo-mechanial properties, which are useful for several potential applications in environmental protection, biotechnology, and others areas. Therefore, this work study the aforementioned film properties of sodium [...]

Structural and Thermo-Mechanical Characterization of Calcium and Barium Alginate Films

Vidal-Urquiza T.K., University of Puerto Rico, PR

Alignate films require its precise characterization of mechanical and thermo-mechanial properties, which are useful for several potential applications in environmental protection, biotechnology, and others areas. Therefore, this work study the aforementioned film properties of sodium [...]

Effect of Carbon Black and Silver Nanoparticle Loading on the Structural and Thermo-Mechanical Properties of Chitosan-Based Films

Blagg A., Perales-Perez O., Valentin R., University of Puerto Rico-Mayagüez, PR

This work addresses the synthesis and structural and thermo-mechanical characterization of bare and chitosan-based nanocomposite films synthesized via spin coating and sol casting techniques. The dependence of these properties as a function of the nature [...]

Microwave-assisted synthesis of water soluble ZnSe@ZnS quantum dots

Bailon-Ruiz S.J., Perales-Perez O., Singh S.P., University Of Puerto Rico at Mayaguez, PR

Semiconductors nanocrystals known as quantum dots (QD’s) have attracted much attention because of their optical properties can be tuned just by controlling their crystal-size, composition and shape at the nanoscale. Compared to organic dyes, quantum [...]

Removal of Heavy Metals From Aqueous Solutions with Calcium Alginate Beads

Luna-Pineda T., Román-Velázquez F., University Of Puerto Rico at Mayaguez, PR

The present research is focused on the development of a bio-sorbent based on alginate beads. The alginate is a natural polymer extracted from brown seaweed with capability of hosting divalent cations in gel state, which [...]

Synthesis and Characterization of Alginate-Based Magnetic Nanocomposite

Luna-Pineda T., Román-Velázquez F., University Of Puerto Rico at Mayaguez, PR

Our work addressed the development of a multi-purpose sorbent consisting of magnetite (Fe304) nanoparticles functionalized by dimercaptosuccnic acid (DMSA) and dispersed into porous calcium alginate beads (CAB). The resultant magnetic nanocomposite (MO-CAB) can be considered [...]

Thermal Analysis of Polyimide-Cobalt Ferrite Nanocomposites

Mazuera D., Perales-Perez O., Singh S.P., Suarez O.M., University of Puerto Rico-Mayagüez, PR

Thermal stability and thermomechanical behavior of new polymer-based nanocomposite was investigated to assess the viability of the fabrication process. The nanocomposite film consisted of a polyimide (PI) matrix and nanodispersoids of a recently developed high-coercivity [...]

Removal of Heavy Metals From Aqueous Solutions with Calcium Alginate Beads

Luna-Pineda T., Román-Velázquez F., University Of Puerto Rico at Mayaguez, PR

The present research is focused on the development of a bio-sorbent based on alginate beads. The alginate is a natural polymer extracted from brown seaweed with capability of hosting divalent cations in gel state, which [...]

Synthesis and Characterization of Metastable Nanocrystalline Cobalt

Osorio-Cantillo C., Perales-Perez O., University of Puerto Rico, US

Applications of elemental cobalt are consequence of its phase-dependent magnetic properties; the anisotropic high-coercivity hcp-Co phase is preferred for permanent magnet applications, while the more symmetric low coercivity fcc- and, pseudo-cubic epsilon-Co can be used [...]

Preparation and Characterization of Polyimide-Cobalt Ferrite Nanocomposite

Mazuera D., Cedeño Y., Perales-Perez O., Singh S.P., University of Puerto Rico-Mayagüez, PR

Synthesized 20 nm cobalt ferrite single crystals, which exhibited a coercivity of 2.9kOe at room-temperature, were dispersed in precursor polyamic acid at different volume fractions and cured at 300oC to develop the polyimide matrix. Polyamic [...]