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The effect of electric fields on mobile phase migration velocity and on the retention of chromatographed solutes has been investigated for so-called horizontal electric fields with sample applied at the anode and cathode ends of the plates. An electric field can also affect the surfaces of stationary phases. These investigations were performed in a so-called vertical electric field at a gradient voltage 12 kV cm −1 . The effect of the electric field on the apolar component of the surface free energy was determined for six popular stationary phases; for silica and aluminum oxide it was possible to determine the acidic and basic components of the surface free energy. The effect of electric fields on the zeta potential of silica-methanol and aluminum oxide-water systems was also demonstrated.

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Journal of Thermal Analysis and Calorimetry
Authors: V. Sydorchuk, W. Janusz, S. Khalameida, E. Skwarek, J. Skubiszewska-Zięba, R. Leboda, and V. Zazhigalov

) were prepared using an ultrasonic disperser (Sonicator Misonix Inc.) before the electrokinetic measurements. The zeta potential ζ of the system has been determined as a function of pH for 0.001 mol dm −3 solution of NaCl. The pH values, measured by a

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CeO2-catalyzed ozonation of phenol

The role of cerium citrate as precursor of CeO2

Journal of Thermal Analysis and Calorimetry
Authors: M. F. Pinheiro da Silva, L. S. Soeira, K. R. P. Daghastanli, T. S. Martins, I. M. Cuccovia, R. S. Freire, and P. C. Isolani

characterized by X-ray diffraction patterns (XRD), BET multipoint surface analysis, scanning electron microscopy (SEM) and Raman spectroscopy, zeta potential measurements at pH 3, and emission spectroscopy. Characterizations of oxide types 1 and 2 have been

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Journal of Thermal Analysis and Calorimetry
Authors: J. R. Azevedo, R. H. Sizilio, M. B. Brito, A. M. B. Costa, M. R. Serafini, A. A. S. Araújo, M. R. V. Santos, A. A. M. Lira, and R. S. Nunes

size and zeta potential The nanoparticles size was analyzed by Photon Correlation Spectroscopy (Malvern Instruments, Malvern, UK). Samples were diluted in purified water and the measurements were performed at a scattering angle 173° at ambient

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Journal of Radioanalytical and Nuclear Chemistry
Authors: Sharayu Kasar, Sumit Kumar, Aishwarya Kar, K. Krishnan, N. Kulkarni, and B. Tomar

Abstract  

Sorption of Eu(III), an analogue of trivalent actinides (Am, Cm), by amorphous titania as well as different crystalline phases of titania, namely anatase and rutile, have been studied as a function of pH, using 154Eu (half life = 8.8 yrs, Eγ = 123,247 keV) as a radiotracer. The objective of this study was to investigate the effect of the crystalline phase of the titania on their sorption behaviour towards the metal ion. Amorphous titania was prepared by organic route and was converted into anatase and rutile by heating at elevated temperatures based on the differential thermal analysis studies. Eu(III) sorption by all forms of titania rises sharply with the pH of the suspension, with the sorption edge shifting to higher value in the order; amorphous < anatase < rutile. However, the normalization of the sorption data to the surface area of the sorbents resulted in the overlapping of the sorption curves for amorphous and anatase phases, with the data being higher for rutle in the lower pH region, indicating the effect of the crystal phase on sorption behaviour of Eu(III).

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Journal of Thermal Analysis and Calorimetry
Authors: E. Skwarek, S. Khalameida, W. Janusz, V. Sydorchuk, N. Konovalova, V. Zazhigalov, J. Skubiszewska-Zięba, and R. Leboda

measurements. The zeta potential ζ of the system has been determined as a function of pH for 0.01 mol dm −3 solution of NaCl. The pH values, measured by a precision digital pH meter, were adjusted by addition of 0.1 mol dm −3 HCl or NaOH solutions. The zeta

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Journal of Thermal Analysis and Calorimetry
Authors: Adelia Emilia de Almeida, Ana Luiza Ribeiro Souza, Douglas Lopes Cassimiro, Maria Palmira Daflon Gremião, Clóvis Augusto Ribeiro, and Marisa Spirandeli Crespi

particle size, polydispersity index (PdI) and zeta potential (ZP), and to evaluate the interaction among the components forming SLN by DSC, the thermal stability by TG, and the kinetic parameters through the thermal decomposition step by the non

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systems were titrated with the NaOH solution (1 × 10 −1 mol dm −3 ). The zeta potentials of the alumina particles without and with PVA were measured with the Zetasizer 3000 laser zetameter (Malvern Instruments). The suspension containing 0.02 g of

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production and analyzed with increase of 20,000×. Particle size and zeta potential analysis The mean particle size was determined through dynamic light scattering (DLS, Zetasizer Nano NS, Malvern Instruments

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Journal of Thermal Analysis and Calorimetry
Authors: Ellen Denise P. Almeida, Adjane A. Costa, Mairim R. Serafini, Fábia C. Rossetti, Juliana M. Marchetti, Victor Hugo V. Sarmento, Rogéria de S. Nunes, Mário Ernesto G. Valerio, Adriano A.S. Araújo, and Ana Amélia M. Lira

zeta potential ( ZP ) of stearic acid ( SA ) in SLN

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