Tag: silica

Welcome to Dani Beltran in the N&N Group

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We welcome Dani Beltran, who will stay with us until February 2017. Dani Beltran already did his Final Degree Project in our group (Synthesis and crystallization of SiO2-GeO2 gels), supervised by Martí Gich, while he was studying Nanoscience and Nanotechnology at UAB. Now he is a M.Sc. student in Biomedical Engineering at UB-UPC and will work with us in a project of crystallization of metastable phases under negative pressures, also supervised by Martí Gich. 

Welcome Dani! We hope you enjoy this stay with us!

Hot off the press: new article in small! Alignment under magnetic field of mixed iron oxide/silica colloidal mesoporous particles induced by shape anisotropy

Scheme of the preparation of the mixed iron oxide/silica rod-like colloidal particles.

A new paper entitled “Alignment under magnetic field of mixed Fe2O3/SiOcolloidal mesoporous particles induced by shape anisotropy” (Jheng-Guang Li, Giulia Fornasieri, Anne Bleuzen, Martí Gich, Alexander Gloter, Frédéric Bouquet, Marianne Impéror-Clerc, DOI: 10.1002/smll.201602272) has been publised in small this last September 14, 2016. Congratulations Martí!

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Hot off the press: accepted manuscript in Chem. Commun.

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Today is the big day: second manuscript accepted!

The manuscript “A silica-based magnetic platform decorated with mixed ligand gold nanoparticles: A recyclable catalyst for esterification reactions” (Elif Ertem, Nerea Murillo-Cremaes, Randy Patrick Carney, Anna Laromaine, Emma-Rose Janeček, Anna Roig* and Francesco Stellaccia*; DOI: 10.1039/C6CC01146B) has been accepted in Chemical Communications

This paper describes a novel and convenient synthetic strategy for the preparation of magnetically responsive silica nanospheres decorated with mixed ligand protected gold nanoparticles. Gold nanoparticles are attached to the silica surface via stable amide bond formation. The hierarchical nanospheres show promising results as a reusable and efficient catalyst for esterification reactions and they can be recovered through a simple magnetic separation.

Congratulations!

Figure: Schematic illustration of: (a) the partial ligand exchange of 3-mercapto-1-propanesulfonate (MPSA):1-octanethiol(OT) covered gold nanoparticles, (b) the synthesis of core-shell magnetic silica and (c) the synthesis of the magnetic silica decorated with gold nanoparticles hierarchical nanospheres.

Congratulations to Anna May for the Extraordinary Ph.D. Award

IMG-20160211-WA0005We congratulate Anna May for obtaining the Extraordinary Ph.D Award (Premi Extraordinari de Doctorat) for her thesis entitled “Insights into nanomaterials: from surfactant systems to meso/macroporous materials and nanoparticles“, carried out at the Chemical Engineering Department of the Universitat de Barcelona (UB), and supervised by José María Gutiérrez and Montserrat Porras.

The awards ceremony took place today, February 11, at the UB Paranimf, and was also the ceremony to award the epidemiologist and oncologist Francesc Xavier Bosch with the honorary doctorate (doctor honoris causa). Dr. F. Xavier Bosch is well-known for participating in the development of the HPV vaccine.

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Hot off the press! New publication in Chem. Commun.

Crystallization of hollow mesoporous silica nanoparticles

Glenna L. Drisko, Adrian Carretero-Genevrier, Alexandre Perrot, Martí
Gich, Jaume Gàzquez, Juan Rodriguez-Carvajal, Luc Favre, David Grosso,
Cédric Boissière,  Clément Sanchez

ChemComm, DOI: 10.1039/x0xx00000x

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Complex 3D nacrostructured nanoparticles are  transformed from amorphous silica into pure polycrystalline α-quartz using catalytic quantities of  alkaline earths as devitrificants. Walls as thin as 10 nm could be crystallized without losing the architecture of the particles. The roles of cation size and the mol% of  incorporated devitrificant on crystallization behavior are studied, with Mg2+, Ca2+, Sr2+ and Ba2+  allproducing pure α-quartz under certain conditions.

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FRIDAY 14th, PhD DEFENSE of NEREA MURILLO

Nerea Murillo-Cremaes will defend her PhD thesis entitled:

MULTIFUNCTIONAL SILICA-BASED NANOPARTICLES FOR BIOMEDICAL APPLICATIONS

The thesis has been supervised by Dr. Concha Domingo and Dr. Anna Roig.

The thesis jury will be formed by Prof Daniel Ruiz-Molina, Institut Català de Nanociencia i Nanotecnologia, Nanosfun Group, Bellaterra, Catalonia, Prof Vadim Kessler, Swedish University of Agricultural Sciences, Department of Chemistry and Biotechnology, Sweden and  Prof Julio San Román, Biomaterials Group, Instituto de Ciencia y Tecnologia de Polimeros (CSIC), Madrid, Spain

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 This thesis aimed to fabricate hybrid (organic-inorganic) complex materials as drug carriers  using supercritical fluids. For that purpose, two main objectives have been addressed: first, evaluation of the potentiality of porous silica-based materials synthesized without using porogenic agents as drug delivery systems; and second, exploiting the utility of SCFs in the synthesis and functionalization of those materials. During the realization of this work, silica-based nanostructured materials have been synthesized, loaded with a model drug, physical and chemically modified on their surface, and their interaction with relevant biological entities and media were investigated.

 

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Hot off the press: new article in Journal of Polymer Science

A novel solventless coating method to graft low molecular weight polyethyleneimine on silica
fine powders
 Nerea Murillo-Cremaes, Pedro López-Aranguren, Lourdes F. Vega, Javier Saurina,
Anna Roig*Concepción Domingo*
 Journal of Polymer Science, Part A: Polymer Chemistry (2014), on-line July DOI:10.1002/pola.27297

 

 

alt       A ring-opening polymerization process catalyzed by compressed CO2 at low pressure and temperature and in the absence of any organic solvent is presented. Fabrication of hybrid materials involving two types of silica nanoparticles (one of them with a magnetic core) coated with hyperbranched polyethyleneimine of low molecular weight was succesfully achieved. Properties of  the obtained materials are identified as excellent for some biomedical applications 

First 2013 publication by Nerea Murillo-Cremaes et al.

GA_Nerea_2013The 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 RoigConcepción Domingo, The Journal of Supercritical Fluids, Volume 73, January 2013, Pages 34–42, doi:10.1016/j.supflu.2012.11.006).