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615 results on '"Mallamace F"'

1. Complex viscosity behavior and cluster formation in attractive colloidal systems

Author

Mallamace, F., Chen, S. H., Coniglio, A., de Arcangelis, L., Del Gado, E., and Fierro, A.

Subjects
Condensed Matter - Statistical Mechanics, Condensed Matter - Soft Condensed Matter
Abstract

The increase of the viscosity, which is observed in attractive colloidal systems by varying the temperature or the volume fraction, can be related to the formation of structures due to particle aggregation. In particular we have studied the non trivial dependence of the viscosity from the temperature and the volume fraction in the copolymer-micellar system L64. The comparison of the experimental data with the results of numerical simulations in a simple model for gelation phenomena suggests that this intriguing behavior can be explained in terms of cluster formation and that this picture can be quite generally extended to other attractive colloidal systems., Comment: 5 pages, 4 figures

Published
2005
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29. SANS study of Amyloid β1−40: Unfolded monomers in DMSO, multidimensional aggregates in water medium

Author

Festa, G, Sancesario, G, Corsaro, C, Longo, S, Mallamace, D, Fazio, E, Arcidiacono, L, Sakai, Vg, Senesi, R, Mallamace, F, and Andreani, C

Subjects
Amyloid aggregation, Amyloid fibrils, SANS, Statistics and Probability, Condensed Matter Physics, Amyloid | Amyloid beta-Peptides | amyloid-β peptide, Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
Published
2019

43. The fragile-to-strong dynamic crossover transition in confined water: nuclear magnetic resonance results.

Author

Mallamace, F., Broccio, M., Corsaro, C., Faraone, A., Wanderlingh, U., Liu, L., Mou, C.-Y., and Chen, S. H.

Subjects
*WATER of crystallization, *NUCLEAR magnetic resonance, *CRYSTALLIZATION, *ARRHENIUS equation, *SUPERCOOLED liquids, *SUPERCOOLING
Abstract

By means of a nuclear magnetic resonance experiment, we give evidence of the existence of a fragile-to-strong dynamic crossover transition (FST) in confined water at a temperature TL=223±2 K. We have studied the dynamics of water contained in 1D cylindrical nanoporous matrices (MCM-41-S) in the temperature range 190–280 K, where experiments on bulk water were so far hampered by crystallization. The FST is clearly inferred from the T dependence of the inverse of the self-diffusion coefficient of water (1/D) as a crossover point from a non-Arrhenius to an Arrhenius behavior. The combination of the measured self-diffusion coefficient D and the average translational relaxation time ≤sτT>, as measured by neutron scattering, shows the predicted breakdown of Stokes-Einstein relation in deeply supercooled water [ABSTRACT FROM AUTHOR]

Published
2006
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44. On the existence of two states in liquid water: impact on biological and nanoscopic systems

Author

Maestro, L. M., Marqués, M. I., Camarillo, E., Jaque, D., Solé, J. García, Gonzalo, J. A., Jaque, F., Valle, Juan C. Del, Mallamace, F., and Stanley, H. E.

Subjects
Physics::Optics
Abstract

This work reviews several properties of liquid water, including the dielectric constant and the proton-spin lattice relaxation, and draws attention to a bilinear behaviour defining a crossover in the temperature range 50 ± 10°C between two possible states in liquid water. The existence of these two states in liquid water plays an important role in nanometric and biological systems. For example, the optical properties of metallic (gold and silver) nanoparticles dispersed in water, used as nanoprobes, and the emission properties of CdTe quantum dots (QDs), used for fluorescence bioimaging and tumour targeting, show a singular behaviour in this temperature range. In addition, the structural changes in liquid water may be associated with the behaviour of biological macromolecules in aqueous solutions and in particular with protein denaturation.

Published
2016

46. A small-angle neutron scattering study of 2-butoxyethanol/D2O solutions.

Author

D’Arrigo, G., Teixeira, J., Giordano, R., and Mallamace, F.

Subjects
NEUTRON scattering, DEUTERIUM oxide, SOLUTION (Chemistry)
Abstract

Small-angle neutron scattering (SANS) measurements have been performed in heavy water solutions of 2-butoxyethanol as a function of concentration and temperature. The results indicate that there exist some alcohol aggregation above a narrow concentration range (x=0.015–0.02, where x is the alcohol molar fraction) and the size of the aggregates increases with temperature taking a maximum value at a composition close to the critical concentration. The analysis of the size and of the absolute scattered intensity at q=0(I0) in terms of a microscopic model of aggregation, as well as the indications from other experiments, suggest that these aggregates are micelle-like structures. [ABSTRACT FROM AUTHOR]

Published
1991
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47. Role of the H bond and cooperative effects in normal and supercooled water studied by anisotropic low frequency light scattering.

Author

Aliotta, F., Vasi, C., Maisano, G., Majolino, D., Mallamace, F., and Migliardo, P.

Subjects
RAMAN effect, SCATTERING (Physics), HYDROGEN bonding, ANISOTROPY, LIGHT scattering
Abstract

Depolarized Rayleigh and low frequency Raman scattering data in bulk supercooled water are presented. The measurements, performed from the normal region down to -26.95 °C for the first time, allow a quantitative data analysis and reveal the existence of a fine structure of the central contribution. We have identified a ‘‘fast’’ and ‘‘slow’’ contribution whose intensities show an opposite behavior as a function of temperature. Such a behavior is understood as a decay of local order due to the H bond. The spectral density function, as derived from the depolarized Raman data, shows the presence of acoustical and intermolecular optical contributions characteristic of many structured disordered materials. A critical comparison with molecular dynamics (MD) and neutron scattering results is also presented. [ABSTRACT FROM AUTHOR]

Published
1986
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