Small gold nanoparticles with narrow size distribution achieved in SBA-15 pores by using ionic silsesquioxane instead of thiol group as stabilizer and adhesion agent

New strategy to obtain high surface area anatase nanotube/AuNP photocatalyst

“…These compounds are water soluble due to the presence of charged quaternary ammonium groups, and they are able to form thin films onto inorganic surfaces, due to the presence of silanol groups [38]. Therefore, the ionic silsesquioxanes can be applied as both stabilizer and adhesion agent for gold and other metal nanoparticles [39][40][41].…”

AgNP‐decorated SBA‐15 for MWCNT Paste Modified Electrode: A Sensor for Simultaneous Voltammetric Determination of Paracetamol and Sulfamethoxazole

“…The so‐obtained colloidal dispersion of silver nanoparticles underwent a two‐fold dilution with water and was designated as AgNP. Subsequently, the SBA‐15 support was synthesized based in previous reports [20, 21]. The SBA‐15 (100 mg) was suspended in 10 mL of AgNP and the system was mechanically stirred for 72 h in closed flask at 20 °C.…”

“…Ordered mesoporous silica‐based materials were discovered in the 1990s. The most investigated one, SBA‐15 [20], has a highly ordered hexagonal pore structure, with cylindrical mesopores and a narrow distribution of pore diameter and due to its excellent properties (high surface area, high pore volume, high hydrothermal stability) it is widely used in different areas such as catalysis, adsorption and separation processes, [21–22]. More recently, the use of SBA‐15 in sensor devices is drawing more attention, since it presents interconnected nanopores on its mesopore wall allowing fast diffusion and low resistance to electron transfer [23–25].…”

Pd Nanoparticles Supported on N-Incorporated Hybrid Organosilica as an Active and Selective Low-Temperature Phenol Hydrogenation Catalyst

“…Synergistic effect achieved by using the catalyst support as an active component along with metal nanoparticles is an attractive strategy in catalysis. , Redox-active supports like CeO 2 and TiO 2 act as electronic and structural promoter in heterogeneous catalysis . On the other hand, silica is an inert and inactive support whose role is to hold the metal nanoparticles with the aid of surfactants, expensive dendrimers or polymers, and structure-directing agents. , Synthesis and stabilization of downsized metal nanoparticles on silica without any aiding reagents is challenging due to the weak interaction of the metal precursors with the silica surface. − Incorporation of heteroatoms like N-containing organic domains on the host silica framework that can result in an organic–inorganic hybrid support is an effective protocol that can stabilize and electronically modify the fine metal sites that can boost the catalyst performance. − Compared to simple surface-anchored functionality, covalently bridged N-containing organic moieties in the silica framework helps to create well-dispersed active centers that are more stable and leach-proof under the catalytic reaction condition. − Previous reports on the catalytic hydrogenation of phenol have shown the role of surface chemistry of the support, which majorly influences the product distribution where the chemisorbed phenol on the support reacts with the metal-activated hydrogen, usually on Pd sites, yielding the products . It is suggested that the non-planar mode of phenol adsorption over basic sites lead to yield cyclohexanone, whereas the coplanar adsorption on acidic sites results in the cyclohexanol and cyclohexane formation. ,− …”