Results 11 to 20 of about 227 (97)
International Journal of Polymer Science, 2018 Ibuprofen-loaded poly(ethyl cyanoacrylate) nanoparticles were prepared by semicontinuous heterophase polymerization of ethyl cyanoacrylate in the presence of ibuprofen; different surfactant concentration, pH, and temperature were used.
J. A. Balleño +6 more
doaj +2 more sources
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 +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 +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 +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 +7 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
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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 +8 more
wiley +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 +5 more
wiley +1 more source
El reciclaje de polímeros, alternativa para la síntesis de resinas epóxicas en la industria
Inventum Ingeniería, Tecnología e Investigación, 2009 El trabajo aquí descrito plantea la forma de fabricación de una resina epoxica a partir de Aceite Epoxidado de Palma (AEP), obtenido por reacción del Aceite Refinado de Palma (ARP) con ácido peroxiformico en condiciones de calentamiento por microondas ...
Freddy Leonard Alfonso M.
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Revista Bases de la Ciencia, 2020 In this work, the activity of samarium (III) acetate (Sm(OAc)3) was evaluated as a possible initiator in the ring opening polymerization (ROP) of 1-methyltrimethylene carbonate (MTMC). The effects of temperature (Tr) and monomer-initiator molar ratio (
Jesús Miguel Contreras Ramírez +1 more
doaj +1 more source