Light Scattering
Mostrando 13-24 de 530 artigos, teses e dissertações.
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13. Interplay between Near-Field Properties and Au Nanorod Cluster Structure: Extending Hot Spots for Surface-Enhanced Raman Scattering
Materials science has observed a continuous increase in the use of metal nanoparticles in a wide range of studies, from fundamental physics to technological applications such as photocatalysis and optical communication devices. This broad scope has the same fundamental origin, the localized surface plasmons, whose excitation leads to strong light confinement
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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14. Improved Functionalization of Multiwalled Carbon Nanotubes in Ultra-Low Acid Volume: Effect of Solid/Liquid Interface
A comprehensive study of a less harmful functionalization of multiwalled carbon nanotubes (MWCNT) was performed. The influence of ultrasonic cavitation and solid/liquid interface was indirectly evaluated by statistical characterization of MWCNT aspect ratio and degree of functionalization. MWCNT aspect ratio was determined through hundreds of electron micros
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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15. Remineralizing Potential of Nano-Silver-Fluoride for Tooth Enamel: An Optical Coherence Tomography Analysis
Abstract Objective: To evaluate the use of nanosilver fluoride in the enamel remineralization process through optical coherence tomography. Material and Methods: All samples were submitted to demineralization process by pH cycling during 14 days and randomly distributed into three groups (n = 11): Nanosilver Fluoride (NSF), Sodium fluoride (NaF), and negat
Pesqui. Bras. Odontopediatria Clín. Integr.. Publicado em: 10/10/2019
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16. Variation of the milling conditions in the obtaining of nanocellulose from the paper sludge
ABSTRACT This work aimed to evaluate three different milling conditions, seeking the optimization of CNS isolation process. The paper sludge was chemically treated with detergent and H2O2, by two steps, to remove the noncellulosic contents (hemicellulose and lignin). After these treatments, the sample was milled with the variation of a liquid medium. The thr
Matéria (Rio J.). Publicado em: 16/09/2019
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17. Aplicação de método estatístico no estudo da influência do peróxido de hidrogênio e do borohidreto de sódio na síntese de nanoparticulas de prata (AGNPS)
RESUMO Nanomateriais vem atraindo bastante atenção nos últimos anos em virtude das suas propriedades que permitem aplicações em diversas áreas como: química, física, medicina, fármacos e engenharias. No universo dos nanomaterias, as nanopartículas de prata (AgNPs) tem despertado o interesse de vários pesquisadores devido ao seu potencial bacterici
Matéria (Rio J.). Publicado em: 16/09/2019
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18. Droplet Size Distribution in Water-Crude Oil Emulsions by Low-Field NMR
This paper reports the droplet size distribution (DSD) measurements in 28 W/O (water/oil) crude oil emulsions prepared with two Brazilian oils (medium and heavy) under different shear conditions using both 10 g L-1 NaCl solution and water production by low field nuclear magnetic resonance (NMR, 2.2 MHz). The PFGSTE (pulsed-field gradient-stimulated echo) pul
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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19. Study of Cellulose Nanocrystals and Zinc Nitrate Hexahydrate Addition in Chitosan Hydrogels
In this study, chitosan hydrogels were produced with 0, 2, 4 and 6 wt% of cellulose nanocrystals (CNC) using hexahydrate zinc nitrate (Zn(NO3)2.6H2O) as a catalyst for chitosan crosslinking reaction. CNC´s size was estimated by dynamic light scattering (DLS) and surface charge by zeta potential. Hydrogels were characterized by rotational rheometer, swelling
Mat. Res.. Publicado em: 25/04/2019
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20. Stability of Nanocomposite Edible Films Based on Polysaccharides and Vitamin C from Agroindustrial Residue
The agroindustrial residue from the production of acerola pulp is rich in residual vitamin C. Thus, aiming its extraction and stabilization, this work proposed the nanoparticle (NP) encapsulation via ionic gelation with subsequent preparation of nanocomposites (NC) film based on galactomannan matrix. NP were characterized and their stabilities were evaluated
Mat. Res.. Publicado em: 18/04/2019
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21. Sobre a ação de Euler-Heisenberg e o espalhamento da luz pela luz
Resumo Este trabalho tem como objetivo apresentar uma revisão, com fins didáticos e de divulgação científica, acerca dos desenvolvimentos que envolvem o espalhamento da luz pela luz e sua relação com a ação de Euler-Heisenberg. Apresentamos inicialmente uma sucinta introdução histórica seguida por discussões sobre a ação de Euler-Heisenberg em
Rev. Bras. Ensino Fís.. Publicado em: 11/02/2019
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22. Chitosan/NaF Particles Prepared Via Ionotropic Gelation: Evaluation of Particles Size and Morphology
The aim of this work was to perform an analysis of the influence of Sodium Fluoride (NaF) on chitosan particles size and morphology produced via ionotropic gelation with higher rotational stirring speed. Samples were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Dynamic Light Scattering (DLS), Zeta Potential (ζ), Scanning Electron Microsc
Mat. Res.. Publicado em: 25/06/2018
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23. Biological Synthesis of Selenium Nanoparticles and Evaluation of their Bioavailability
ABSTRACT Nanoparticles due to their unique properties have attracted more attention and their bacterial biosynthesis is more favorable because is environmental friendly and the size and yield of nanoparticles can be optimized. The aim of the present study was biosynthesis of Selenium nanoparticles using Bacillus cereus. For this purpose, bacterial culture wa
Braz. arch. biol. technol.. Publicado em: 14/06/2018
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24. Ultrasound assisted miniemulsion polymerization to prepare poly(urea-urethane) nanoparticles
Abstract Recently, the physical and chemical effects of ultrasound in polymeric materials synthesis have attracted great attention. This work presents the synthesis of novel polymeric materials by polymerization of isophorone diisocyanate with different polyols. Polymers were synthesized by step miniemulsion polymerizations, using ultrasound bath and thermo
Polímeros. Publicado em: 21/05/2018