Preparation and Reaction of Titania Particles Encapsulated in Hollow Silica Shells as an Efficient Photocatalyst for Stereoselective Synthesis of Pipecolinic Acid

Chandren, Sheela; Ohtani, Bunsho

doi:10.1246/cl.2012.677

Cited by 12 publications

(5 citation statements)

References 16 publications

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“…Figure 8 shows time-course curves of H 2 liberation from aqueous methanol solutions in the second step of the platinization (see Experimental), as has been reported in the preliminary paper [30]. An almost linear increase in the amount of H 2 was observed after an appreciable induction period for all of the samples except for dir-SiO 2 /TiO 2 .…”

Section: Preparation and Characterization Of Hollow Core-shell Structsupporting

confidence: 56%

Preparation, characterization and photocatalytic performance of titania particles encapsulated in hollow silica shells as an efficient photocatalyst for redox-combined stereoselective synthesis of l-pipecolinic acid from l-lysine

Chandren

Ohtani

2012

Journal of Photochemistry and Photobiology A: Chemistry

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Hollow core-shell particles of a titania core and a silica shell, the latter of which was highly porous, water-swollen and not directly connected to the former, were synthesized by a multistep process including carbon and silica coatings followed by calcination of the carbon-layer combustion. The core-shell particles suspended in aqueous solutions of L-lysine showed improved stereoselectivity in photocatalytic redox-combined synthesis of L-pipecolinic acid (L-PCA), maintaining L-lysine conversion and PCA selectivity, compared with that by bare titania particles, presumably due to the acidic microenvironment of the titania core to control the position of oxidation by positive holes as the first step of the redox-combined process. Modification of the silica layers to acidify them was also beneficial for improvement of optical purity of the product, PCA.

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Section: Preparation and Characterization Of Hollow Core-shell Structsupporting

confidence: 56%

Preparation, characterization and photocatalytic performance of titania particles encapsulated in hollow silica shells as an efficient photocatalyst for redox-combined stereoselective synthesis of l-pipecolinic acid from l-lysine

Chandren

Ohtani

2012

Journal of Photochemistry and Photobiology A: Chemistry

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“…Following an analogous pathway, core-void-shell anatase TiO 2 was prepared via solvothermal treatment of sucrose and TiO 2 , followed by removal of the carbon-precursor via calcination. 159,160 These photocatalytically active materials were used in the stereoselective synthesis of pipecolinic acid. A slightly different approach for the preparation of hollow-coreshell mesoporous TiO 2 has been reported 156 using a stepwise protocol based on seed-emulsion-polymerization, followed by coating of the Ti-precursor and subsequent calcination to generate hollow TiO 2 materials for electrophoretic studies.…”

Section: Synthesis Of Core-shell Nanocatalystsmentioning

confidence: 99%

“…157,158 Ohtani and co-workers adopted a similar procedure involving solvothermal and calcination techniques for the synthesis of SiO 2 /void/TiO 2 (and also platinized SiO 2 /void/TiO 2 ). 159,160 These photocatalytically active materials were used in the stereoselective synthesis of pipecolinic acid. In a related example, SiO 2 /Mg(OH) 2 spheres have been prepared using a modified Sto ¨ber method to prepare SiO 2 spheres (cores), followed by polyethyleneglycol (PEG) and sodium dodecyl benzene sulfonate (SDBS) mediated coating of Mg(OH) 2 onto the SiO 2 spheres; 161 depending on the ratio of precursors, different morphologies, including hollow core-shell and honeycombed structures, were obtained.…”

Section: Synthesis Of Core-shell Nanocatalystsmentioning

confidence: 99%

Core–shell nanoparticles: synthesis and applications in catalysis and electrocatalysis

et al. 2015

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Core-shell nanoparticles (CSNs) are a class of nanostructured materials that have recently received increased attention owing to their interesting properties and broad range of applications in catalysis, biology, materials chemistry and sensors. By rationally tuning the cores as well as the shells of such materials, a range of core-shell nanoparticles can be produced with tailorable properties that can play important roles in various catalytic processes and offer sustainable solutions to current energy problems. Various synthetic methods for preparing different classes of CSNs, including the Stöber method, solvothermal method, one-pot synthetic method involving surfactants, etc., are briefly mentioned here. The roles of various classes of CSNs are exemplified for both catalytic and electrocatalytic applications, including oxidation, reduction, coupling reactions, etc.

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“…The foam was then removed from the APTMS solution, and rinsed with adequate amounts of ethanol and distilled water respectively. The foam was dried overnight in an oven at 60 ºC This method was modified accordingly based on a previous study using polycarbonate material [24]. The schematic diagram of the sample pre-treatment and surface modification using APTMS is illustrated in Fig.…”

Section: Materials and Chemicals Sample Pretreatment And Modification...mentioning

confidence: 99%

Effect of silver inhibition on the ceramic foam as flame suppression

Hamzah,

Kasmani,

Chandren

2024

E3S Web Conf.

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Aluminium dust explosions pose significant safety and economic challenges in various industrial processes. Due to this, the current research explores an innovative approach by inhibiting the silver nanoparticles (Ag NPs) to ceramic porous form substrate as a flame suppressant in order to mitigate the risks associated with these explosions. The antimicrobial and non-toxic qualities of silver are also attractive to be applied in medical and food technology. However, the interfacial adhesion between the metallic (nanosilver) and non-metallic (silica-based-ceramic) is still vaguely studied due to the mechanical and surface energy mismatch between the organic surface and the inorganic layers. From this study, the physicochemical and mechanical properties of the silver-coated ceramic foam were analyzed using X-ray diffraction, field emission scanning electron microscopy with energy dispersive X-ray, thermogravimetric analysis, and compression test. From the mechanical testing, it was found that the percentage increase of maximum load for silver-ceramic foam from the original ceramic foam was about 60%. The results indicate that silver-coated foam has a better compressive strength of 0.93 MPa as compared to 0.58 MPa by the original ceramic. The inhibition effect of Ag NPs powder on the explosion pressure evolution and flame spread mechanism of aluminium powder at different concentrations and particle sizes was tested using the Hartmann experimental system.

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Preparation and Reaction of Titania Particles Encapsulated in Hollow Silica Shells as an Efficient Photocatalyst for Stereoselective Synthesis of Pipecolinic Acid

Cited by 12 publications

References 16 publications

Preparation, characterization and photocatalytic performance of titania particles encapsulated in hollow silica shells as an efficient photocatalyst for redox-combined stereoselective synthesis of l-pipecolinic acid from l-lysine

Preparation, characterization and photocatalytic performance of titania particles encapsulated in hollow silica shells as an efficient photocatalyst for redox-combined stereoselective synthesis of l-pipecolinic acid from l-lysine

Core–shell nanoparticles: synthesis and applications in catalysis and electrocatalysis

Effect of silver inhibition on the ceramic foam as flame suppression

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