fe3o4 magnetic nanoparticles were synthesized by co-precipitation of fe2+ and fe3+ in aqueous naoh. then silica was coated on the obtained nanoparticles and the whole composite was functionalized with chlorosulfonic acid in ch2cl2. the obtained nanocomposite (fe3o4@sio2-so3h) was characterized by ft-ir, vsm and xrd techniques and was used as an efficient catalyst in condensation reaction of ind...

Distributed sensing of gas-phase chemicals is a promising application for mesoporous materials when combined with highly sensitive miniaturized gas sensors. We present a direct application of a mesoporous silica thin film on a highly sensitive miniaturized resonant chemical sensor with a mass sensitivity at the zeptogram scale for relative humidity and CO(2) detection. Using mesoporous silica t...

Recent breakthroughs in the synthesis of mesoporous silica materials with controlled particle size, morphology, and porosity, along with their chemical stability, has made silica matrices highly attractive as the structural basis for a wide variety of nanotechnological applications such as adsorption, catalysis, sensing, and separation. In addition, we and others have discovered that surface-fu...

Large-pore mesoporous silica microspheres with tailored pore sizes were prepared via a two-step synthesis process by using a triblock copolymer EO20PO70EO20 as template in combination with a cosurfactant cetyltrimethylammonium bromide (CTAB) and a cosolvent ethanol. The obtained mesoporous silica spheres were characterized by scanning electron microscopy (SEM), transmission electron microscopy ...

We demonstrate porous silica surface modification, combined with microcontact printing, as an effective method for enhanced protein patterning and adsorption on arbitrary surfaces. Compared to conventional chemical treatments, this approach offers scalability and long-term device stability without requiring complex chemical activation. Two chemical surface treatments using functionalization wit...

It is demonstrated in this paper that silica nanoparticles coated with core/shell gold provide efficient thermal, optical, and morphological properties with respect to the cellulose-polyhedral oligomeric silsesquioxanes (POSS) hybrid system. The one-step synthesis of a silica/gold nanocomposite is achieved with a simultaneous hydrolysis and reduction of gold chloride in the presence of formic a...

In water and wastewater, phosphate anions are considered critical contaminants because they cause algae blooms eutrophication. The present work aims at studying the removal of from aqueous solutions using silica particles functionalized with polyethylenimine. parameters affecting adsorption process such as pH, initial concentration, adsorbent dose, presence competitive anions, carbonate, nitrat...

a simple and efficient method for synthesis of tetrahydropyrimido[4,5-b]quinoline derivatives via three component reaction of aromatic aldehydes, dimedone and 6-amino uracil derivatives using a catalytic amount of sulfonic acid functionalized nanoporous silica (sba-15-pr-so3h) is described. the advantages of this method are easy and clean work-up, high yield, mild reaction condition, reusable c...