Ionic Pair
Mostrando 1-12 de 49 artigos, teses e dissertações.
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1. A Green Analytical Method Using Polyurethane Foam for The Extraction and Determination of Lauryl Ether Sulfate in Personal Care Hygiene Products
A green methodology was developed for the extraction and determination of lauryl ether sulfate in raw materials and commercial liquid soap and shower gel samples. The method avoids the use of organic solvents, offering a simple, cheap, and safe analysis. The methodology is based on the sorption of an ionic pair consisting of a cationic dye and an anionic sur
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Surface and textural characterization of TiO2 pillared organoclays
ABSTRACTTiO2 organoclays are potential adsorbents for aqueous pollutants and subsequently they could favour the photocatalysis of them. For this reason, the study of their surface and textural characteristics is important for the improvement of those processes. In this work TiO2 pillared organoclays were studied. The surfactant (hexadecyltrimethilammonium br
Matéria (Rio J.). Publicado em: 2015-09
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3. An Ion-Pair Reagent Incorporated Polystyrene Nanofiber Applied to Solid Phase Extraction of 5-Hydroxytryptamine in Human Plasma
Polystyrene (PS) nanofibers incorporated with ion-pair (IP) reagent, e.g., sodium dodecyl sulfonate (SDSn), were developed as functional adsorbents for the solid-phase extraction (SPE) of ionic neurotransmitter such as 5-hydroxytryptamine (5-HT), prior to the determination by high performance liquid chromatography-fluorescence detection (HPLC-FLD). A compreh
J. Braz. Chem. Soc.. Publicado em: 2015-03
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4. Avaliação da imobilização do sal trissódico do ácido 1,8 -dihidróxi-2-(4-sulfofenilazol)-3,6-naftalenodisulfônico (SPADNS) em sílica gel / Evaluation of 2-(4-sulphophenylazo)-1,8-dihydroxy-3,6-napthalene disulphonic acid trisodium salt immobilization at silica gel
Solid phase extraction (SPE) is a kind of procedure for preconcentration and choice of solid phase is very important to develop analytical methods because your selectivity, affinity and retention capacity. The metals preconcentration is very used in environmental samples that have metals such as Pb2+, Cd2+, Ni2+, Al3+ at μg L-1. In that sense, the main
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2011
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5. Estudo da sorção do corante catiônico violeta cristal por espuma de poliuretano em meio aquoso contendo dodecilsulfato de sódio
This work presents a detailed study about the sorption of crystal violet (CV) cationic dye onto polyether type polyurethane foam (PUF). The sorption process was based on the formation of an ionic-pair between cationic dye and dodecylsulfate anion (SDS), which presented high affinity by PUF. Set-up employed in the study was built up by adjusting a 200 mg cyli
Química Nova. Publicado em: 2009
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6. Eletrodo íon-seletivo para determinação potenciométrica de alumínio(III) em meio de fluoreto
The construction and analytical evaluation of a coated graphite Al(III) ion-selective electrode, based on the ionic pair formed between the Al(F)n3-n anion and tricaprylylmethylammonium cation (Aliquat 336S) incorporated on a poly(vinylchloride) (PVC) matrix membrane are described. A thin membrane film of this ionic pair and dibutylphthalate (DBPh) in PVC wa
Química Nova. Publicado em: 2004-12
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7. Structure and bonding of iron-acceptor pairs in silicon
Iron-acceptor pairs (Fe-A, A = B, Al, Ga, and In) in silicon were investigated using an ionic-based model, which incorporates the valence electron cloud polarization and the lattice relaxation.Our results are generaly in good agreement with the experimental trends among the Fe-A pairs, describing the increase in the pair donor energy level with increasing A
Brazilian Journal of Physics. Publicado em: 2002-06
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8. Blendas de polipirrol e poli(cloreto de vinila) : propriedades termicas, mecanicas e eletroquimicas
Blends including an intrinsically conductive polymer, polypyrrole or polythiophene, and an insulating polymer, PVC, were prepared. The method used was the oxidative chemical polymerization of the heterocyclic monomers, in the vapor phase, in PVC films impregnated with an oxidant agent (FeCl3). This procedure was efficient for the preparation of blends compos
Publicado em: 1995
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9. Implementação de tecnicas de luminescencia em quimica analitica
This work involves two parts. The first one is related to the development of the Room-Temperature Phosphorescence as an analytical technique. In this case, the sample to be analysed is adsorbed on the surface of a solid material (filter paper or silica-gel) or dissolved in a micellar medium. In the beginning a nitrogen laser spectrofluorimeter was used for s
Publicado em: 1991
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10. Effect of mechanical deformation on ionic transport in polimeric films. / Efeito da deformação mecânica no transporte iônico em filmes poliméricos.
Recently a piezoelectric effect was found when a polymeric film, separating two electrolyte solutions at different concentrations, was deformed. This effect was attributed to the modulation of the mobility of the íons in the polymer. It was observed that the effect decreases as the electrolyte concentrations increases. In order to understand more deeply thi
Publicado em: 1990
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11. Estudo termodinamico da interacao de ions lantanideos - (III) e anion cloreto em N, N-dimetilacetamida
By using the calorimetric titration tecnique, the following equilibria in N,N-dimethylacetamide (DMA) solutions, at 298K, have been studied: Ln(sol) + X¨(sol) LnX (sol) Ln(sol) + X¨(sol) LnX2 (sol) where Ln = Y and lanthanide elements (except Pm), and X¨ = Cl. Also, when Ln = La and Nd and X¨ = Br e NO3. The stoichiometric equilibrium constants (K1 and K
Publicado em: 1978
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12. Discrimination among individual Watson–Crick base pairs at the termini of single DNA hairpin molecules
Nanoscale α-hemolysin pores can be used to analyze individual DNA or RNA molecules. Serial examination of hundreds to thousands of molecules per minute is possible using ionic current impedance as the measured property. In a recent report, we showed that a nanopore device coupled with machine learning algorithms could automatically discriminate among the fo
Oxford University Press.