169,840 research outputs found
Mujeres con discapacidad y sexualidad: una investigación empírica en el marco del «feminismo de la diversidad funcional»
No full textFlower-like AuPtPd-Fe3O4 Nanocatalyst for Electrochemical Removal of Humic Acids and Cr(VI)
No full textA new nanohybrid for electrochemical removal of humic acids and Cr(VI)
No full textA new nanohybrid, based on flower‐like AuPtPd‐Fe3O4, has been designed and prepared through an easy and scalable synthetic approach for the effective and simultaneous removal of humic acids (HAs) and Cr(VI). The nanocatalyst, prepared in a one‐step procedure, consists of nanoparticles with a grain size of about 40 nm, constituted of a magnetite core ca. 20 nm and petals of PtPd and Au and, after a ligand exchange process, results dispersible in water. Calibration equations were plotted for the removal evaluation in water samples. Electrochemical tests were carried out at pH 3.0 and 30 mA. HAs were highly mineralized with TOC removal efficiency of 95% after only 3‐h electrolysis, while 99% of total chromium (Cr) was removed in 3 h. A mechanism was proposed to describe the catalyst activity. The nanocatalyst shows high removal performances for HAs and Cr(VI) even after 10 times treatment, indicating good stability
Langmuir-Blodgett Nanotemplate and Radiation Resistance in Protein Crystals: State of the Art
No full textA state-of-the-art review of the role of the Langmuir-Blodgett nanotemplate on protein crystal structures is here presented. Crystals grown by nanostructured template appear more radiation resistant than the classical ones, even in the presence of a third-generation highly focused beam at the European Synchrotron Radiation Facility. The electron density maps and the changes in parameters such as total diffractive power, B-factor, and pairwise R-factor have been discussed. Protein crystals, grown by the Langmuir-Blodgett nanotemplate-based method, proved to be more radiation resistant compared to crystals grown by the classical hanging drop method in terms of both global and specific damage
A one-step SC-CO2 assisted technique to produce compact PVDF-HFP MoS2 supercapacitor device
No full textSafety, easiness, and ecologically friendly preparation methods are key features in the fabrication of a portable supercapacitor. In this work, it is reported the use of supercritical CO2 (SC–CO2)-assisted gel drying for the direct preparation in a one-step of a novel porous and portable supercapacitor device. It consists of three layers, grown together and able to uptake a large amount of an ionic liquid, of an aerogel of Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP): the middle layer is formed by PVDF-HFP alone and the top, and bottom layers are formed by PVDF-HFP aerogels containing dispersed molybdenum disulfide (MoS2) nanosheets (i.e., PVDF-HFP + MoS2). The produced supercapacitor device (PVMS) is characterized by a mesoporous structure with high surface area, taking advantage from both non-flammability and electrochemical stability of PVDF-HFP and high capacitance of MoS2 due to its fast ionic conductivity. The supercapacitor, at the optimized operative conditions, achieves an excellent specific capacitance of 176 F/g and a very high energy density of 97.8 Wh/Kg at a power density of 0.65 of kW/kg (current density 0.6 A/g), that still remains 76.4 Wh/kg at 5.1 kW/kg (current density 5 A/g, specific capacitance of 138.2 F/g). The device shows good stability in an ionic liquid electrolyte, suggesting that the proposed process can be a new opportunity to produce highly bulky improved supercapacitors
Highly sensitive electrochemical detection of Arsenic (III): Fe3O4 nanoparticles covered graphene oxide
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Oxygen-bound Hell's gate globin I by classical versus LB nanotemplate method.
No full textX-ray atomic structure of recombinant Hell's gate globin I (HGbI) from Methylacidophilum infernorum was calculated from the X-ray diffraction data of two different types of crystals: obtained by classical hanging drop and by LB nanotemplate method under the same crystallization conditions. After the accurate comparison of crystallographic parameters and electron density maps of two structures they appears to be quite similar, while the quality of the crystals grown by LB nanotemplate method was higher then of those grown by classical method. Indeed, the resolution of the LB crystal structure was 1.65 Å, while classical crystals showed only 3.2 Å resolution. Moreover, the reproducibility of this result in the case of LB crystals was much better-nine crystals from 10 gave the same structural results, while only two of 10 classical crystals were appropriate for the X-ray structure resolution
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