Results 11 to 20 of about 25,920 (147)

Preparation and Loading with Rifampicin of Sub‐50 nm Poly(ethyl cyanoacrylate) Nanoparticles by Semicontinuous Heterophase Polymerization

Journal of Nanomaterials, Volume 2016, Issue 1, 2016., 2016
We report the preparation of poly(ethyl cyanoacrylate) (PECA) nanoparticles by semicontinuous heterophase polymerization carried out at monomer starved conditions at three monomer addition rates. Particles in the nanometer range were obtained, the size of which diminishes with decreasing monomer addition rate as shown by the fact that particles with ...
H. Saade, C. Barrera, R. Guerrero, E. Mendizábal, J. E. Puig, R. G. López, Md Nurunnabi   +6 more
wiley   +1 more source

Chitosan‐Coated Magnetic Nanoparticles with Low Chitosan Content Prepared in One‐Step

Journal of Nanomaterials, Volume 2012, Issue 1, 2012., 2012
Chitosan‐coated magnetic nanoparticles (CMNP) were obtained at 50°C in a one‐step method comprising coprecipitation in the presence of low chitosan content. CMNP showed high magnetization and superparamagnetism. They were composed of a core of 9.5 nm in average diameter and a very thin chitosan layer in accordance with electron microscopy measurements.
Yolanda Osuna, Karla M. Gregorio-Jauregui, J. Gerardo Gaona-Lozano, Iliana M. de la Garza-Rodríguez, Anna Ilyna, Enrique Díaz Barriga-Castro, Hened Saade, Raúl G. López, Renyun Zhang   +8 more
wiley   +1 more source

One‐Step Method for Preparation of Magnetic Nanoparticles Coated with Chitosan

Journal of Nanomaterials, Volume 2012, Issue 1, 2012., 2012
Preparation of magnetic nanoparticles coated with chitosan in one step by the coprecipitation method in the presence of different chitosan concentrations is reported here. Obtaining of magnetic superparamagnetic nanoparticles was confirmed by X‐ray diffraction and magnetic measurements.
Karla M. Gregorio-Jauregui, Ma. Guadalupe Pineda, Jorge E. Rivera-Salinas, Gil Hurtado, Hened Saade, José L. Martinez, Anna Ilyina, Raúl G. López, Sergio J. Mejía-Rosales   +8 more
wiley   +1 more source

Preparation of Silver Nanostructures from Bicontinuous Microemulsions

Journal of Nanomaterials, Volume 2012, Issue 1, 2012., 2012
Precipitation of silver nanoparticles at 70°C was carried out by dosing a 1.3 M sodium borohydride aqueous solution over bicontinuous microemulsions formed with a mixture of sodium bis(2‐ethylhexyl) sulfosuccinate (AOT) and sodium dodecylsulfate (SDS) as surfactants, a 0.5 M silver nitrate aqueous solution, and toluene.
M. A. Pedroza-Toscano, M. Rabelero-Velasco, R. Díaz de León, H. Saade, R. G. López, E. Mendizábal, J. E. Puig, Alejandro Manzano Ramirez   +7 more
wiley   +1 more source

High‐Yield Synthesis of Zinc Oxide Nanoparticles from Bicontinuous Microemulsions

Journal of Nanomaterials, Volume 2011, Issue 1, 2011., 2011
The high‐yield synthesis of zinc oxide (ZnO) primary nanoparticles with high purity and with diameters between 6 and 22 nm using bicontinuous microemulsions is reported in this work. The ZnO nanoparticles were made by hydrolysis of Zn(NO3)2 with NaOH aqueous solution and precipitation, followed by calcination of the precipitate.
S. López-Cuenca, L. A. Pérez Carrillo, M. Rabelero Velasco, R. Díaz de León, H. Saade, R. G. López, E. Mendizábal, J. E. Puig, Takuya Tsuzuki   +8 more
wiley   +1 more source

Diseño de un reactor químico de polimerización para la producción de ácido poliláctico

Revista de Iniciación Científica, 2023
Debido a los problemas medioambientales ocasionados por la producción de plásticos convencionales, se ha optado por el desarrollo de alternativas como la producción de polímeros de fuentes renovables, los cuales se pueden obtener de materias primas ricas
Aleida America Loor Chavez
doaj   +1 more source

Polyisoprene Nanoparticles Prepared by Polymerization in Microemulsion

Journal of Nanomaterials, Volume 2010, Issue 1, 2010., 2010
Batch polymerization of isoprene was carried out at 25∘C in a normal microemulsion stabilized with sodium dodecyl sulfate and initiated with the redox couple tert‐butyl hydroperoxide/tetraethylene‐pentamine. Characterization by transmission electronic microscopy showed that polyisoprene nanoparticles with number‐average diameter close to 20 nm were ...
Y. Apolinar, L. F. Ramos, H. Saade, R. Díaz de León, R. G. López, Sang-Hee Cho   +5 more
wiley   +1 more source

Obtención de termoplásticos a partir de plumas de pollo

FIGEMPA, 2016
Se obtuvieron películas de termoplásticos biodegradables a partir de queratina de plumas de pollo. Las plumas de pollo contienen en su mayor parte una proteína llamada queratina, la cual fue la sustancia principal de estudio en la investigación, ya que ...
Luis Calle-Guadalupe, Washington Ruiz López, Katherine Verduga   +2 more
doaj   +1 more source

Efecto de surfactantes polimerizables en la distribución de tamaño de partícula, pH, viscosidad, contenidos de sólidos y de monómero residual de una resina estireno-butilacrilato [PDF]

Polímeros, 2013
Se presentan los resultados de la polimerización en emulsión de una resina acrílica estirenada usando surfactantes polimerizables, los cuales presentan ventajas técnicas como baja formación de espuma, alta resistencia de la película al contacto con agua ...
Luis A. Rios, David Ocampo, Alexander Franco, Jhon Fredy Cardona, Fernando Cardeño   +4 more
doaj   +1 more source

Aplicando la química orgánica en la síntesis de polímeros por el mecanismo en etapas

Educación Química
La enseñanza química es dinámica, y una manera de generar aprendizaje significativo es a través de su aplicación. Por ejemplo, la química orgánica se aplica en los mecanismos de polimerización y propicia su entendimiento.
Ana María Herrera-González, Nayely Trejo-Carbajal, Martín Caldera-Villalobos   +2 more
doaj   +1 more source