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Romero-Cano MS Martín-Rodríguez A de las Nieves FJ 《Journal of colloid and interface science》2000,227(2):329-333
An experimental desorption study of Triton X-100 from latices with different functionality is presented. Two different strategies to follow the desorption experiment have been used: first, a discontinuous method based on the wash step (centrifugation-removal-redispersion); and second, a continuous method based on the replacement of the disperse media. The desorption results show that in all cases a residual amount of Triton X-100 remains adsorbed, indicating irreversibility of the surfactant adsorption. Finally, the effect of desorption on the colloidal stability of one type of latex-surfactant complex has been analyzed. Copyright 2000 Academic Press. 相似文献
53.
D. Bravo A. Martín J. J. Carvajal M. Aguiló F. Díaz F. J. López 《The European Physical Journal B - Condensed Matter and Complex Systems》2007,58(3):237-242
An electron paramagnetic resonance (EPR) study of Er3+
ions in single crystals of RbTiOPO4 (RTP) is presented. The EPR
spectra show the existence of six different Er3+ centres. The
g-matrix has been determined for these centres from the
analysis of the angular dependences of the spectrum in three planes of the
crystal. The study supports that erbium can enter the Rb+ and Ti4+
low-symmetry sites of RTP. This conclusion differs from those for
KTP:Er3+ and RTP codoped with Nb and Er. The different occupancies
found for Er in these various crystals is suggested to be due to the
differences in Er concentration. 相似文献
54.
E.?Carvajal O.?NavarroEmail author R.?Allub M.?Avignon B.?Alascio 《The European Physical Journal B - Condensed Matter and Complex Systems》2005,48(2):179-187
We study the electronic and magnetic properties of ordered perovskites Sr
2FeMO6 (where M is a transition metal), among which
some compounds, like Sr2FeMoO6 are half-metallic
with high Curie temperature while Sr2FeWO6 is an
antiferromagnetic insulator. Using a double exchange type model with an
interaction between localized spins and conduction electrons together with a
tight-binding Hamiltonian and the renormalized perturbation expansion
method, we study the behavior of Tc as a function of the number of
conduction electrons and also as a function of the Fe-M energy difference.
We also consider the Sr2FeMoxW1-xO6
compounds which present a magnetic and metal-insulator transition as a
function of doping. 相似文献
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M. Méndez J. J. Carvajal L. F. Marsal P. Salagre M. Aguiló F. Díaz P. Formentín J. Pallarès Y. Cesteros 《Journal of nanoparticle research》2013,15(3):1-16
In the present study, for the first time, Cu3N/NiTiCu/Si heterostructures were successfully grown using magnetron sputtering technique. Nanocrystalline copper nitride (Cu3N with thickness ~200 nm) thin films and copper nanodots were subsequently deposited on the surface of 2-μm-thick NiTiCu shape memory thin films in order to improve the surface corrosion and nickel release properties of NiTiCu thin films. Interestingly, the phase transformation from martensite phase to austenite phase has been observed in Cu3N/NiTiCu heterostructures with corresponding change in texture and surface morphology of top Cu3N films. Field emission scanning electron microscopy and atomic force microscope images of the heterostructures reveals the formation of 20-nm-sized copper nanodots on NiTiCu surface at higher deposition temperature (450 °C) of Cu3N. Cu3N passivated NiTiCu films possess low corrosion current density with higher corrosion potential and, therefore, better corrosion resistance as compared to pure NiTiCu films. The concentration of Ni released from the Cu3N/NiTiCu samples was observed to be much less than that of pure NiTiCu film. It can be reduced to the factor of about one-ninth after the surface passivation resulting in smooth, homogeneous and highly corrosion resistant surface. The antibacterial and cytotoxicity of pure and Cu3N coated NiTiCu thin films were investigated through green fluorescent protein expressing E. coli bacteria and human embryonic kidney cells. The results show the strong antibacterial property and non cytotoxicity of Cu3N/NiTiCu heterostructure. This work is of immense technological importance due to variety of BioMEMS applications. 相似文献
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