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Babes L Denizot B Tanguy G Le Jeune JJ Jallet P 《Journal of colloid and interface science》1999,212(2):474-482
Colloidal iron oxides play an important role as magnetic resonance imaging (MRI) contrast agents. The superparamagnetic particles actually used are constituted by solid cores (diameter of 5-15 nm), generally coated by a thick polysaccharidic layer (hydrodynamic radii of 30-100 nm), and formulated by direct coprecipitation of iron salts in the presence of polymeric material. To better control the synthesis, we attempted to formulate new stable uncoated superparamagnetic nanoparticles. Colloids were generated by coprecipitation of an aqueous solution of iron salts and tetramethylammonium hydroxide (TMAOH) solution. The influence of parameters such as media composition, iron media, injection fluxes, Fe and TMAOH concentrations, temperature, and oxygen on size, magnetic and magnetic resonance relaxometric properties, and colloidal stability of particles were evaluated. We have determined the relative importance of these parameters as well as the optimal conditions for obtaining uncoated stable particles with an average size of 5 nm and interesting relaxivities. The interpretation of the observed limits takes into account diffusibilities of reactants and product, feeding rates of reactants, and surface properties of nanoparticles. A model of synthesis, related to spontaneous emulsification of suspensions, is proposed. Copyright 1999 Academic Press. 相似文献
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Experimental results on float glass by recent analytical techniques — ESCA, photon emission induced by ion bombardment and ellipsometry — support the conclusion that tin from a metal bath penetrates with relatively high concentration only in the first few nanometers from the surface. 相似文献
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M. P. Felicissimo J. L. Peixoto M. S. Barbosa G. Demortier J.-J. Pireaux U. P. Rodrigues-Filho 《Journal of Radioanalytical and Nuclear Chemistry》2005,267(1):209-217
Summary The purpose of this study was to investigate by PIXE and PIGE the pottery from two archaeological sites located near the Brazil-Bolivia
border in Pantanal, an area of natural preservation. The region was inhabited by ancient Amerindian tribes long before the
Latin America colonization period and a deep understanding of their environment, cultural attributes and interconnections
can only be achieved based on the study of archaeological findings. Multivariate statistical procedures were used to determine
similarities and correlations between the analyzed samples and to indicate possible sources of raw material provenience. The
results showed that traces of Cr, Cu and Ti and Na/Si and Mg/Si counting ratios were important to distinguish sherds from
the archaeological sites MS-CP-71 and MS-CP-61. 相似文献
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A. Azioune M. Marcozzi V. Revello J.‐J. Pireaux 《Surface and interface analysis : SIA》2007,39(7):615-623
In this work, aluminium (Alclad 2024‐T3) substrates were cleaned by an r.f. (13.56 MHz) plasma, using argon (Ar), oxygen (O2) and a mixture of O2/Ar (50:50) gases. The effectiveness of plasma cleaning was checked in situ using X‐ray photoelectron spectroscopy (XPS) and ex situ using water contact angle measurements. XPS O/Al surface atomic ratios are in excellent agreement with those of the crystalline boehmite and the pseudoboehmite. Oxygen O 1s peak‐fitting was used to quantify the proportion of hydroxyl ions and the functional composition on the aluminium surface: the surface cleaned with O2 plasma contains 50% of aluminium hydroxides, the ones cleaned with Ar plasma and with Ar/O2 plasma contain, respectively, 25 and 37% hydroxyl ions. The binding energy separation between Al 2p and O 1s is characteristic of AlO(OH). Thin SiOx films were subsequently deposited from a mixture of hexamethyldisiloxane (HMDSO) and oxygen. In the absence of oxygen, a hydrophobic (Θ≥ 100° ) film characteristic of polydimethylsiloxane (PDMS) is formed: polysiloxane‐like thinner films (SiOx) are obtained with the introduction of oxygen. XPS and contact angle measurements confirmed both the composition and the structure of these films. More importantly, contact angle measurements using different liquids and interpreted with the van Oss‐Good‐Chaudhury theory allowed determination of the surface free energy of the deposited films: the calculated values of surface tension of the film formed from HMDSO/O2: (50/50) are in excellent agreement with those of reference silica‐based materials such as a silicon wafer and cleaned glass. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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van den Brink HB Blok HP Bobeldijk I Bouwhuis M Dodge GE Harakeh MN Hesselink WH Ireland DG de Jager CW Jans E de Jonge N Kalantar-Nayestanaki N Kasdorp WJ Ketel TJ Konijn J Lapikás L van Leeuwe JJ van der Meer RL Nooren GJ Norum BE Passchier E Pellegrino AR Spaltro CM van der Steenhoven G Steijger JJ Templon JA Theunissen JA van Uden MA de Vries H de Vries R de Witt Huberts PK 《Physical review letters》1995,74(18):3561-3564
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