In this study, authors demonstrate the formation of oriented piezoelectrically active α-quartz thin films directly on silicon. Films are prepared by dip-coating from alcohol/ water solutions of soluble silicic acid precursors plus surfactant or block copolymer structure-directing agents. Solvent evaporation drives the self-assembly of amorphous silica films composed of ordered arrays of pores. An appropriate thermal treatment results on epitaxial quartz films.
We congratulate the authors and specially our group member Martí Gich. You can read the full article
Soft-Chemistry–Based Routes to Epitaxial α-Quartz Thin Films with Tunable Textures
A. Carretero-Genevrier, M. Gich, L. Picas, J. Gazquez, G. L. Drisko, C. Boissiere, D. Grosso, J. Rodriguez-Carvajal, C. Sanchez
www.sciencemag.org SCIENCE VOL 340 17 MAY 2013, 827
You can also read a highlight written by Jeff Brinker in the same issue: Quartz on Silicon. The integration of quartz with silicon may provide a route to fabricate advanced piezoelectric devices. Jeffrey Brinker and Paul G. Clem.
A Nanoscale paper on “Ultrafast continuous synthesis of crystalline ferrite nanoparticles in supercritical ethanol” (has recently been published. It is the result from the collaboration with the group of Cyril Aymonier from the ICMB-CNRS in Bordeaux, where Oana Pascu spent an internship during her Ph.D. and now she holds a post-doctoral contract.
Magnetic nanoparticles (NPs) are of increasing interest in various industrially relevant products. For these, the development of greener and faster approaches facilitating scaling-up production is of paramount importance. Here, we report a novel, green and potentially scalable approach for the continuous and ultrafast (90 s) synthesis of superparamagnetic ferrite NPs (MnFe2O4, Fe3O4) in supercritical ethanol (scEtOH) at a fairly moderate temperature (260 °C). ScEtOH exhibits numerous advantages such as its production from bio-resources, its lack of toxicity and its relatively low supercritical coordinates (pc = 6.39 MPa and Tc = 243 °C), being therefore appropriate for the development of sustainable technologies. The present study is completed by the investigation of both in situ and ex situ NP surface functionalization. The as-obtainednanoparticles present good crystallinity, sizes below 8 nm, superparamagnetic behavior at room temperature and high saturation magnetization. Moreover, depending on the capping strategy, the ferrite NPs present extended (for in situ coated NPs) or short-term (for ex situ coated NPs) colloidal stability.
The research on drug impregnation of different carriers using supercritical fluids and its in vitro release conducted by Nerea Murillo-Cremaes et al. has been published online in the first 2013 number of The Journal of Supercriticla Fluids as: “Nanostructured silica-based drug delivery vehicles for hydrophobic and moisture sensitive drugs” (Nerea Murillo-Cremaes, Ana M. López-Periago, Javier Saurina, Anna Roig, Concepción Domingo, The Journal of Supercritical Fluids, Volume 73, January 2013, Pages 34–42, doi:10.1016/j.supflu.2012.11.006).
Surface Reactivity of Iron Oxide Nanoparticles by Microwave-Assisted Synthesis; Comparison with the Thermal Decomposition Route
Oana Pascu, Elisa Carenza, Martí Gich, Sònia Estradé, Francesca Peiró, Gervasi Herranz, and Anna Roig
J. Phys. Chem. C, Article ASAP, DOI: 10.1021/jp303204d