University of Puerto Rico-Mayagüez

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 [...]

Cytotoxic studies of PEG functionalized ZnO Nanoparticles on MCF-7 cancer cells

Rodriguez Martinez C., Ramirez Vick J.E., Perales O., Singh S.P., University of Puerto Rico-Mayagüez, US

Nanoparticles have shown great promise in biomedical applications. Zinc oxide (ZnO) nanoparticles are being explored for various applications such as sun screen lotion, antimicrobial properties, advanced textiles, photodynamic therapy and electronic devices. We have synthesized [...]

Multifunctional Fe3O4/ZnO core-shell nanoparticles for photodynamic therapy

Beltran J.C., Tomar M.S., Singh S.P., Perales O., Rivera L., Peña S., University of Puerto Rico-Mayagüez, PR

The photodynamic therapy (PDT) based on core-shell structures require efficient luminescence within specific wavelength range, preferably in near infrared. In the present study we aim to create a multifunctional platform for PDT through Fe3O4/ZnO core [...]

Electric Field Effect on the Rheology of MWCNT Dispersions in Liquid Crystalline Polymers

Cameron-Soto A.R., Acevedo-Rullán A., University of Puerto Rico-Mayagüez, PR

Carbon nanotubes (CNT) are ideal candidates for the development of nanocomposites. Nevertheless, to achieve their potential they should be dispersed and aligned with a specific orientation. Many techniques have been proposed to achieve these requirements [...]

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 [...]

Effect of Silica Nanoparticles on Rheological Properties and Gelation Temperature of Biodegradable Polymer Gels

Florián-Algarín V., Acevedo A., University of Puerto Rico-Mayagüez, PR

The discovery of new potent and insoluble drugs has emphasized the need for personalized dosages and novel drug-delivery systems. The use of biodegradable polymers is a good alternative to form films in which a solid [...]

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 [...]

Composition- and Size-Controlled Synthesis of Mn-Zn Ferrite Nanocrystals for Potential Magnetocaloric Applications

Calderón-Ortiz E., Perales-Perez O., Urcio S., University of Puerto Rico-Mayagüez, PR

The use of ferromagnetic fluid for cooling applications where the fluid can be pumped with no moving mechanical parts, using the magnetocaloric effect, can be a great advantage for many applications where maintenance or power [...]

Effect of Rare Earth Doping on Magnetic Properties of Cobalt Ferrite Nanocrystals

Cedeño-Mattei Y., Uwakweh O.N.C., Osorio-Cantillo C., University of Puerto Rico-Mayagüez, PR

Cobalt ferrite (CoFe2O4) is a highly anisotropic magnetic material due to the magnetocrystalline anisotropy contribution from Co2+. The addition of foreign cations of different oxidation states, substituting Co2+ or Fe3+, can lead to an atomic [...]

Functionalization of Magnetite (Fe3O4) Nanoparticles for Cancer Treatment

Herrera A.P., Rodríguez H.L., Torres-Lugo M., Rinaldi C., University of Puerto Rico-Mayagüez, US

We have studied the synthesis of magnetite (Fe3O4) nanoparticles functionalized with crosslinked dextran for magnetocytolysis application using human colon cancer cells (CaCo-2). Size of the magnetite nanoparticles was determined by SQUID, XRD, and TEM measurements, [...]