Calorimetric Titration
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Estudo termodinâmico de associação de surfatantes zwitteriônicos e sua interação com polímeros através de titulação calorimétrica / Thermodynamic study of zwitterionic surfactants self-assembly and its interaction with polymers by calorimetry titration
As sulfobetaínas (SB) são uma classe de surfatantes zwitteriônicos. A presença de grupos carregados tanto positiva quanto negativamente na mesma molécula concede à sua cabeça polar uma hidrofilicidade intermediária entre surfatantes iônicos e não-iônicos. O estudo termodinâmico de associação da série homóloga de sulfobetaínas, bem como sua i
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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2. Aplicação de Zr/Ti-PILC no processo de adsorção de Cu(II), Co(II) e Ni(II) utilizando modelos físico-químicos de adsorção e termodinâmica do processo
The aim of this investigation is to study how Zr/Ti-PILC adsorbs metals. The physico-chemical proprieties of Zr/Ti-PILC have been optimized with pillarization processes and Cu(II), Ni(II) and Co(II) adsorption from aqueous solution has been carried out, with maximum adsorption values of 8.85, 8.30 and 7.78 x10-1 mmol g-1, respectively. The Langmuir, Freundli
Química Nova. Publicado em: 2008
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3. Remoção de Pb(II) e Cr(VI) de efluentes industriais utilizando resíduos de Ipê (Tabebuia spp.), Maçaranduba (Manilkara spp.) e Pequiá (Caryocar spp.)
(Brazilian) Sawdust samples of Caryocar spp.; Manilkara spp. and Tabebuia spp. have been used for Cr(VI) and Pb(II) adsorption from water at 25oC. The series of adsorption isotherms were adjusted to a modified Langmuir equation from data obtained by suspending the sawdust with K2Cr2O7 or Pb(NO3)2 solutions, which gave the maximum number of moles adsorbed as
Publicado em: 2008
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4. Sintese e Caracterização de Derivados da Celulose Modificada com Anidridos Orgânicos : adsorção e Termodinamica de Interação com Cations Metalicos / Synthesis and characterization of cellulose derivatives with organic anhydrides : adsorption and interation thermodynamic metallic cations
Cellulose is a widely available biopolymer in nature and its draws considerable chemical interest due its various useful applications. The polysaccharide modification is primarily based on their hydroxyl group reactivity, which determines the carbohydrate chemistry and their related structures. The chemical modification of cellulose was carried out in a solv
Publicado em: 2007
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5. O emprego de quitosana quimicamente modificada com anidrido succínico na adsorção de azul de metileno
The adsorption capacity of alpha-chitosan and its modified form with succinic anhydride was compared with the traditional adsorbent active carbon by using the dye methylene blue, employed in the textile industry. The isotherms for both biopolymers were classified as SSA systems in the Giles model, more specifically in L class and subgroup 3. The dye concentr
Química Nova. Publicado em: 2006-06
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6. Estudo das interações entre enzimas e polímeros: efeito do poli(etileno glicol) na atividade e na conformação estrutural de enzimas. Adsorção de enzimas sobre superfícies sólidas / Study on the interactions between enzymes and polymers: Influence of polyethylene glycol on the activity and conformation of enzymes. Adsorption of enzymes onto solid surfaces
This work aimed to investigate the interactions between enzymes and polymers in solution and also the adsorption behavior of these enzymes on solid surfaces. For that reason it was divided into two parts. In the first part, the influence of poly(ethylene glycol) (PEG), a polymer considered inert and utilized in several biotechnological processes, on the enzy
Publicado em: 2006
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7. Investigação calorimetrica da interação entre poli (N-isopropilacrilamida) e surfatantes ionicos / Calorimetric investigation of the interaction of poly (N-isopropylacrylamide) and ionic surfactants
The interaction of poly(N-isopropylacrylamide), PNIPAM, with an anionic (SDS) and three cationic (dodecyl and hexadecyltrimethylammonium bromides, DTAB and CTAB, and dodecylammonium chloride, DAC) surfactants has been studied using isothermal titration calorimetry and within a temperature range between 17 and 29°C. The high sensitivity of this technique all
Publicado em: 2004
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8. Novos agentes sililantes derivados de precursor epoxido na imobilização e sintese de silica mesoporosa
The silylant precursor agent 3-glycidoxypropyltrimethoxisilane was covalently anchored onto the silica gel surface through homogeneous and heterogeneous routes. Ethylenediamine, 1,3-diaminepropane and 2-aminemethylpyridine molecules were incorporated on the epoxide group in order to explore the properties of these basic nitrogen atoms in coordinating some di
Publicado em: 2003
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9. Crisotila e filossilicatos sinteticos de magnesio e cobre modificados com grupos aminos e mercaptopropil-sintese, caracterização, adsorção de cations metalicos e calorimetria
Chrysotile reacted covalently with aminopropyl- and ethylenediamino- trimethoxysilane organosilanes involving the silane methoxy group and hhdroxyls of magnesium hydroxide. The modified fibers interacted subsequently with 2-pyridine and 2-thiophene carboxaldehydes, favoring the entrance of new basic centers easier. Modified magnesium phyllosilicates containi
Publicado em: 2000
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10. Metil e fenilfosfonatos de calcio-sintese, caracterização, intercalação de aminas alifaticas e calorimetria
Calcium phosphonates Ca(HO3PR)2.xH2O (x = 1 or 2 R = CH3 or C6H5) were synthesized through reaction in aqueous media between calcium and phosphonic acids. The aim was to intercalate n-alkylamines: methyl -, ethyl -, propyl -, butyl -, pentyl and octylamines into Ca(HO3PC6H5)2.2H2O (CaPP1), Ca(HO3PCH3)2.H2O (CaPM) in aqueous media and the anhydrous Ca(HO3PC6H
Publicado em: 2000
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11. Absorção na interface N-(2-aminoetil) (3-aminopropil) silica/soluções dos catons divalentes de cobalto, niquel cobre e zinco em alcool e acetona
Various features concerned with the metal-ligand interactions involving some divalent cations of the firt transition series and silica gel anchored with N-(2-aminoethyl) (3-aminopropil)trimetoxi-silane were studied both in acetone and ethanol. The material was characterized through various techniques as elemental analysis, support geometrical properties meas
Publicado em: 1984
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12. 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