Nanospheres
Mostrando 1-12 de 37 artigos, teses e dissertações.
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1. DEVELOPMENT OF AN AUTOMATED METHOD TO PERFORM A QUANTITATIVE STUDY OF PARTICLE SIZE DISTRIBUTION AND THE EFFECT OF A CONDUCTIVE LAYER IN SCANNING ELECTRON MICROSCOPY
The determination of particle size distribution is an important parameter for controlling industrial processes, particularly in the field of pharmaceuticals. It is also an important parameter for characterizing nanoparticles. The best technique for determining particle size distribution is scanning electron microscopy. The process of counting particles is ty
Quím. Nova. Publicado em: 27/05/2019
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2. Menthol-loaded PLGA Micro and Nanospheres: Synthesis, Characterization and Degradation in Artificial Saliva
Menthol-loaded PLGA micro/nanospheres were synthesized using the multiple emulsion/solvent evaporation technique. Parameters such as stirring rate, external surfactant content, PLGA/menthol weight ratio, solvent evaporation and lyophilization time were evaluated as well as the degradation of micro/nanospheres in an artificial saliva medium. The menthol/PLGA
Mat. Res.. Publicado em: 15/02/2018
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3. In vitro and in vivo evaluation of nano-based films for buccal delivery of zolpidem
Abstract Insomnia is becoming increasingly prevalent in the world general population. Therapies used by patients include over-the-counter therapies, herbal and dietary supplements, and pharmacological or nonpharmacological treatments. Among these, zolpidem is a pharmacological treatment popularly used for insomnia. Zolpidem is well tolerated and especially e
Braz. oral res.. Publicado em: 28/11/2016
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4. Study of Thermal Degradation of PLGA, PLGA Nanospheres and PLGA/Maghemite Superparamagnetic Nanospheres
Poly(glycolide-co-lactide) (PLGA) nanospheres containing magnetic materials have been extensively studied because of its biomedical applications. Therefore, it is very important to know thermal properties of these materials in addition to other physical properties. Thermal degradation activation energy (Eα) of PLGA nanospheres with maghemite entrapment (PLG
Mat. Res.. Publicado em: 24/11/2015
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5. Stibnite Nanoparticles as a New Stabilizer for Poly (Methyl Methacrylate) Exposed to Gamma Irradiation
AbstractPoly (methyl methacrylate), PMMA, may be used in manufacturing of devices, which are exposed to gamma irradiation. However, the polymer undergoes significant changes in its properties during process and the use of additives is a common form to stabilize the PMMA matrix. In this way, stibnite was synthesized by sonochemical method and the amorphous po
Mat. Res.. Publicado em: 2015-10
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6. Syntesis of Carbon Nanostructures Near Room Temperature Using Microwave PECVD
Carbon nanostructures (nanotubes, nanofibers and nanosponges) were synthesized onto Si (001) substrates using a microwave assisted plasma enhanced chemical vapor deposition (PECVD) from C2H2-Ar mixtures at low substrate temperatures (120 °C). Catalytic films (Ni and Cu) 3 nm thick were used. Different structures were formed, depending on the C2H2 partial pr
Mat. Res.. Publicado em: 2015-08
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7. NANOCÁPSULAS E NANOESFERAS DE DISSELENETO DE DIFENILA: SÍNTESE E DISTRIBUIÇÃO BIOLÓGICA / DIPHENYL DISELENIDE NANOCAPSULES AND NANOSPHERES: SYNTHESIS AND BIOLOGICAL DITRIBUTION
Nos últimos anos, os compostos orgânicos de selênio têm sido alvos de interesse em síntese orgânica em virtude da descoberta de suas aplicações sintéticas e de suas propriedades farmacológicas. O disseleneto de difenila (PhSe)2 é um composto orgânico de selênio que apresenta diversos efeitos farmacológicos descritos, porém a pouca solubilidade
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2012
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8. Iron(III) porphyrin covalently supported onto magnetic amino-functionalized nanospheres as catalyst for hydrocarbon and herbicide oxidations
Este trabalho descreve a imobilização por ligação covalente de uma ferroporfirina, cloreto de 5,10,15,20-tetraquis(pentafluorofenil)porfirinaferro(III) (FeTFPP), sobre nanoesferas de maguemita cobertas com sílica aminofuncionalizada. O material resultante (nomeadoγ-Fe2O3/SiO2-NHFeP) foi caracterizado por espectroscopia no infravermelho por refletância
J. Braz. Chem. Soc.. Publicado em: 31/07/2012
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9. Preparação e caracterização de nano-esferas de PLGA contendo 5-fluorouracil e estudo do acoplamento de quitosana e ácido fólico em sua superfície / Preparation and characterization of PLGA nanospheres containing 5-fluorouracil and study of chitosan and folic acid attachment on their surface
5-Fluorouracil (5-FU) e um dos fármacos mais úteis no tratamento de tumores sólidos em adultos, especificamente carcinomas do trato gastrointestinal (estômago, cólon e reto) e da mama. Em resumo, seu maior efeito bioquímico e a inibição da síntese do DNA, pois a concentração que inibe sua síntese pode ainda permitir a sintese do RNA. Causa severo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2011
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10. Drug release from microspheres and nanospheres of poly(lactide-co-glycolide) without sphere separation from the release medium
Foi desenvolvida uma nova técnica que possibilita o monitoramento da liberação de fármacos encapsulados, sem a separação das partículas do meio de liberação, usando espectroscopia de refletância difusa. Foram realizados estudos de liberação do cloro(5,10,15,20-tetrafenilporfirinato) de índio(III) (InTPP) a partir de micro e nanoesferas do copol�
Journal of the Brazilian Chemical Society. Publicado em: 2010
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11. Síntese de fluido magnético à base de maghemita para produção de nanocápsulas magnéticas de albumina bovina
This work describes the preparation of an ionic magnetic fluid in acidic medium based on maghemite nanoparticles, the latter synthesized by coprecipitation via a chemical route developed to provide, in a single step, monomodal samples with no extra procedure for size selection. The prepared magnetic fluid was characterized by X-ray diffraction (XRD) and tran
Publicado em: 2010
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12. Spray-drying technique to prepare innovative nanoparticulated formulations for drug administration: a brief overview
Polymeric nanoparticle systems (nanocapsules and nanospheres) present potential applications as drug delivery systems. Nevertheless, their full applications have not been exploited due to their limited shelf life when stored in aqueous medium. Drying polymeric nanoparticles using spray-drying represents a promising platform to improve the physicochemical sta
Brazilian Journal of Physics. Publicado em: 2009-04