A mesoporous silica nanoparticle-based intracellular cysteine delivery system that could be induced and regulated by cell-produced natural antioxidants was synthesized.

To evaluate the ability of heparin coating to inhibit Double J stent encrustation and compare it with classic polyurethane stent.The study involved five patients bilateral obstructions, who required ureteral placement. Every patient received a heparin-coated traditional for 1 month. After removal, stents were analyzed using field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), micro-infrared spectrophotometry (Micro-IR). These same techniques used analyze...

Abstract The effects of Stöber silica nanoparticles on neuronal survival, proliferation, and the underlying perturbations in calcium homeostasis are investigated well‐differentiated cell line GT1‐7. responses to 50 200 nm diameter compared. 50‐nm affects survival/proliferation a dose‐dependent way, by stimulating apoptotic processes. In contrast, 200‐nm does not show any toxic effect even at relatively high concentrations (292 μg mL −1 ). To identify mechanisms these effects, changes...

Abstract Aqueous chemical growth of zinc oxide nanowires is a flexible and effective approach to obtain dense arrays vertically oriented nanostructures with high aspect ratio. Herein we present systematic study the different synthesis parameters that influence ZnO seed layer thus resulting morphological features free‐standing nanowires. We obtained homogeneous coverage transparent conductive substrates high‐aspect‐ratio nanowire (length/diameter ratio up 52). Such nanostructured vertical...

Silica having a regular mesoporous structure induced by micelle templating (MTS) was functionalised with n-propyltrimethoxysilane under anhydrous conditions. Support modification characterised various methods (X-ray diffraction, FTIR spectroscopy, thermogravimetry, nitrogen adsorption volumetry, microcalorimetry and of water adsorption). Functionalisation takes place mainly at the hydrophobic patches surface, involving surface siloxane bridges, occurs through nucleophilic displacement...

This work deals with the synthesis and characterization of novel Fe-containing sol-gel materials obtained by modifying composition a binary SiO2-CaO parent glass addition Fe2O3. The effect different processing conditions (calcination in air vs. argon flowing) on formation magnetic crystalline phases was investigated. produced were analyzed from thermal (hot-stage microscopy, differential analysis, calorimetry) microstructural (X-ray diffraction) viewpoints to assess both behavior upon...

Abstract Polymer‐derived SiC and Si OC aerogels have been synthesized characterized both from the microstructural point of view as sorbent materials for removing organic dyes (Methylene Blue, MB , Rhodamine B, RB ) water solutions. Their adsorbent behavior has compared with a polymer‐derived foam commercial mesoporous silica. The can efficiently remove solution their capacity is higher to foams due surface area. aerogel remains monolithic after treatment (allowing an easy removal without...

Rare earth elements (REEs) and their compounds are essential for rapidly developing modern technologies. These materials especially critical in the area of green/sustainable energy; however, only very high-purity fractions appropriate these applications. Yet, achieving efficient REE separation purification an economically environmentally effective way remains a challenge. Moreover, current extraction technologies often generate large amounts undesirable wastes. In that perspective,...

The phenomenon of water pollution as a consequence the release herbicides and pesticides into environment is an outgrowing problem that requires performing regenerable adsorbent materials. This work presents synthesis nanocrystalline silicon carbide aerogel its application in removing glyphosate from polluted water. was synthesized via Polymer-Derived Ceramic (PDC) route using allylhydridopolycarbosilane polymeric precursor. By pyrolysis at 1500 °C argon, crystallization β-SiC nanocrystals...

Hemorrhages are still considered a common cause of death and despite the availability different hemostatic agents it is necessary to develop more effective hemostats for bleeding managements in emergency situations. Herein, large-pores mesoporous silica microspheres (MSM) were synthesized, their surface was modified enrich hydroxyls population with aim achieving material enhanced water adsorption capacity high ability. The success modification investigated by Fourier Transform Infrared...

Microcalorimetry and vibrational spectroscopy have jointly been used to study the interaction at room temperature between CO2 Na−ZSM-5. This consists of a reversible, two-step adsorption on sites approximately all equal noninteracting, which constitute an ideal ensemble in thermodynamic sense. From volumetric calorimetric isotherms, standard changes enthalpy Gibbs free energy due were calculated for both 1:1 2:1 adducts formed by Na+ ions, from these data, entropy determined. All modes...

Two samples of SBA-15 mesoporous silica with a different content carboxylic groups (−COOH) were prepared by co-condensation route, using 4-(triethoxysilil)butyronitrile as the organosilane agent, then treating sulfuric acid, which removes template and simultaneously hydrolyses −CN to −COOH groups, shown IR spectroscopy. Both incorporation agents subsequent acid treatment do not affect ordered structure. The proton-donor ability well their accessibility reactants, has been studied in dosing...

Three samples of SBA-15 functionalised with -(CH(2))(3)COOH groups have been prepared by co-condensation, starting from solutions TEOS and 4-(triethoxysilyl)butyronitrile, acting as precursor, different molar compositions. Materials were characterised X-ray diffraction, nitrogen adsorption, FT-IR spectroscopy. The pK(a) the acidic capacity measured for all potentiometric titration. increases increasing amount -COOH precursor in synthesis mixture only up to 10% total alkoxysilane. value...

Ordered mesoporous silica (OMS) having different pore geometries was confined in the channels of anodic alumina membranes (AAMs), as a model system, to investigate adsorption and release bioactive molecules. These systems allow us isolate parameters that play role diffusion molecules mesopores without complications associated with external morphologies particle size. Three were synthesized within AAMs, i.e., (i) (ii) diameters about 4 9 nm columnar alignment mesopores, system (iii) featuring...

Purpose Coupling the potential for bone regeneration and ability in situ controlled drug release a single device is challenging field of research tissue engineering; an attempt to pursue this aim, mesoporous bioactive glass (MBG) membranes belonging SiO 2 -P O 5 -CaO ternary system were produced characterized. Methods The was synthesized via sol-gel route coupled with evaporation-induced self-assembly process by using non-ionic block co-polymer as mesostructure former. MBG structure...