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Chalkidou A.,Aristotle University of Thessaloniki | Chalkidou A.,Molecular Oncology Laboratory | Simeonidis K.,Aristotle University of Thessaloniki | Angelakeris M.,Aristotle University of Thessaloniki | And 6 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2011

In this work we study the heating efficiency of Fe/MgO magnetic core/biocompatible shell nanoparticles and their in vitro application in magnetic hyperthermia on cancer cells. Different human breast cancer cell lines were used to assess the suitability of nanoparticles for in vivo application. The experiments revealed a very good cytotoxicity profile and significant uptake efficiency together with relatively high specific absorption rates and fast thermal response, features that are crucial for adequate thermal efficiency and minimum duration of treatment. © 2010 Elsevier B.V. All rights reserved.

Gomez-Romero P.,Catalan Institute of Nanoscience and Nanotechnology | Gomez-Romero P.,Research Center | Fraile J.,ICMAB CSIC | Ballesteros B.,Catalan Institute of Nanoscience and Nanotechnology
RSC Advances | Year: 2013

A simple modification of a combustion method has been used for the production of ultraporous metals in air. Nitrates of different metallic elements were reacted with glycine as a reducing fuel. The glycine to nitrate ratio can be simply used to control the formation of oxides or, in the case of fuel-rich mixtures, the formation of metals such as Ni, Co, Cu or Ag. Furthermore, the metallic monoliths obtained present a remarkable porosity of fractal nature (from macro to nano scales) with pores ranging from many microns down to at least 5 nm. This exceedingly simple approach shows the way for the design and synthesis of complex porous microstructures of metals for the wide variety of applications where interface optimization is crucial. © 2013 The Royal Society of Chemistry.

Amoros J.,Polytechnic University of Catalonia | Carrera M.,University of Lleida | Granados X.,ICMAB CSIC
Superconductor Science and Technology | Year: 2012

Computation of the current distribution of superconducting devices is an important topic in the understanding of the behavior of superconducting materials, in the development of their applications and in testing the quality of the materials. The most successful technique to measure the currents is based on mapping the magnetic field in the surface of the superconducting sample during or after a magnetization process. Models for solving the inverse problem have been developed based on different techniques. The inversion technique based on considering the currents as the result of a distribution of magnetic moments has been tested for many years in the description of the currents in bulks, giving a useful tool for their characterization, including junctions and porous samples. The restriction of this technique to closed loops of currents does not allow its application to the exploration of superconducting wires. Specific considerations developed for this technique have, however, allowed extension of the technique to the study of HTS tapes in a simple and fast way that can be applied to the exploration of long tapes to determine the current distribution on the fly. In this work we report on the model and the procedure to perform the calculation of currents on tapes carrying current. The specific application to the detection of defects that do not affect the ability to carry current, such as longitudinally centered scratches, is experimentally tested. Details of the application of the method for long tapes are also reported. © 2012 IOP Publishing Ltd.

Bastos-Gonzalez D.,University of Granada | Perez-Fuentes L.,University of Granada | Drummond C.,CNRS Paul Pascal Research Center | Faraudo J.,ICMAB CSIC
Current Opinion in Colloid and Interface Science | Year: 2016

It is increasingly being accepted that solvation properties of ions and interfaces (hydration of ions, hydrophobic or hydrophilic character of interfaces) play a fundamental role in ion-surface interaction in water. However, a fundamental understanding of the precise role of solvation in ionic specificity in colloidal systems is still missing, although important progress has been made over the last years. We present in this contribution experimental evidences (including also ions not usually included in specific ion studies) together with Molecular Dynamics (MD) simulations that highlight the importance of the hydration of ions and surfaces in order to understand the origin of ionic specificity. We first show that both surface polarity and ion hydration determine the sorting of ions according to their ability to induce specific effects (the so-called Hofmeister series). We extend these classical series by considering the addition of the inorganic anions IO3 -, BrO3 - and ClO3 -, which present unusual properties as compared with the ions considered in classical Hofmeister series. We also consider big hydrophobic organic ions such as tetraphenylborate anion (Ph4B-) and tetraphenylarsonium cation (Ph4As+) that in the context of the Hofmeister series behave as super-chaotropes ions. © 2016 Elsevier Ltd.

Bauduin P.,CNRS Marcoule Institute for Separative Chemistry | Prevost S.,Helmholtz Center Berlin | Farras P.,ICMAB CSIC | Teixidor F.,ICMAB CSIC | And 2 more authors.
Angewandte Chemie - International Edition | Year: 2011

Sandwiched: The cobaltabisdicarbollide (mono-)anion ([3,3′-Co(1,2- C2B9H11)2]-, COSAN -) forms monolayer vesicles at low concentrations in water (see picture). An increase in concentration leads to a Coulomb explosion of the closely packed vesicles into small micelles, which results in the coexistence of both aggregation states at higher concentrations. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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