Synthesis of nanostructured composites of metals by supercritical deposition (SCD)

Erkey, Can; Türk, Michael

doi:10.1016/b978-0-444-64089-5.00001-9

Cited by 6 publications

(4 citation statements)

References 164 publications

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“…More details regarding the SFRD process, the equipment and further experimental details can be found elsewhere. [16,17,29] CO oxidation. Sieved catalyst powders (5 mg, 125-250 μm grain size) were deposited in quartz microreactors (Ø: 1.5 mm) with glass wool plugs in front and at the back of the catalyst bed.…”

Section: Methodsmentioning

confidence: 99%

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TiO₂−CeO_x−Pt Hollow Nanosphere Catalyst for Low‐Temperature CO Oxidation

Liebertseder,

Maliakkal,

Crone

et al. 2023

ChemCatChem

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TiO2−CeO2−Pt hollow nanospheres (1 wt‐% Pt) are realized using a liquid‐phase strategy using NaCl as a template. The NaCl template is first coated with TiO2 and thereafter with CeO2 via the hydrolyzation of TiCl(OiPr)3 and Ce(OiPr)4 as suitable alkoxides. Finally, the NaCl template is removed by washing with water. The resulting @TiO2−CeO2 hollow nanospheres (□: inner cavity) exhibit an outer diameter of 140–180 nm, a wall thickness of 30–40 nm, an inner cavity of 80–100 nm, a specific surface area of 210 m2/g, a pore volume and area of 0.08 cm3/g and 191 m2/g, mainly with micropores ≥5 Å and ≤14 Å. The hollow nanosphere support is impregnated with Pt nanoparticles, using two different methods – a wet‐chemical deposition (Pt(ac)2, acetone, 25 °C) and a supercritical fluid reactive deposition (SFRD) process ([Pt(COD)Me2], supercritical CO2, 80 °C, 15.6 MPa) resulting in an uniform size distribution with Pt nanoparticles 2.5±0.1 nm (TiO2−CeO2−PtWCD) and 2.3±0.1 nm (TiO2−CeO2−PtSFRD) in size. The catalytic properties of the TiO2−CeO2−Pt hollow nanospheres are evaluated for CO oxidation between 50 and 500 °C. A promising catalytic activity and stable light‐out/light‐off temperatures are observed especially for the TiO2−CeO2−PtSFRD sample, indicating the suitability of hollow nanospheres as high‐porosity catalyst material.

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Section: Methodsmentioning

confidence: 99%

“…At the end of the experiment, the system was slowly depressurized and cooled to ambient conditions. More details regarding the SFRD process, the equipment and further experimental details can be found elsewhere [16,17,29] …”

Section: Methodsmentioning

confidence: 99%

TiO₂−CeO_x−Pt Hollow Nanosphere Catalyst for Low‐Temperature CO Oxidation

Liebertseder,

Maliakkal,

Crone

et al. 2023

ChemCatChem

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“…Nanoparticles demonstrating robust properties in terms of small size (Suttiponparnit et al, 2011), high surface area to volume ratio and ease of preparation are suitable for theranostic purpose (Dadfar et al, 2019;Erkey and Türk, 2021). Due to having significant bactericidal activity, metal nanoparticle-based treatment of bacterial infections has attracted the interest of researchers to explore and understand it extensively (Yuan et al, 2017;Sánchez-López et al, 2020).…”

Section: Inorganic Nanoparticlesmentioning

confidence: 99%

Mechanistic insights into nanoparticle surface-bacterial membrane interactions in overcoming antibiotic resistance

Modi,

Gaur,

Sengupta

et al. 2023

Front. Microbiol.

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Antimicrobial Resistance (AMR) raises a serious concern as it contributes to the global mortality by 5 million deaths per year. The overall impact pertaining to significant membrane changes, through broad spectrum drugs have rendered the bacteria resistant over the years. The economic expenditure due to increasing drug resistance poses a global burden on healthcare community and must be dealt with immediate effect. Nanoparticles (NP) have demonstrated inherent therapeutic potential or can serve as nanocarriers of antibiotics against multidrug resistant (MDR) pathogens. These carriers can mask the antibiotics and help evade the resistance mechanism of the bacteria. The targeted delivery can be fine-tuned through surface functionalization of Nanocarriers using aptamers, antibodies etc. This review covers various molecular mechanisms acquired by resistant bacteria towards membrane modification. Mechanistic insight on ‘NP surface-bacterial membrane’ interactions are crucial in deciding the role of NP as therapeutic. Finally, we highlight the potential accessible membrane targets for designing smart surface-functionalized nanocarriers which can act as bacteria-targeted robots over the existing clinically available antibiotics. As the bacterial strains around us continue to evolve into resistant versions, nanomedicine can offer promising and alternative tools in overcoming AMR.

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“…Detailed surveys of the results obtained from a large number of different thermodynamically controlled SFRD experiments were provided by Siril and Türk [10] and recently by Yousefzadeh et al [11]. A comprehensive compilation of the studies published in the literature on the preparation of supported nanoparticles on various substrates by SFRD is presented in chapter 7 in [12].…”

Section: Introductionmentioning

confidence: 99%

Deposition of Pd, Pt, and PdPt Nanoparticles on TiO2 Powder Using Supercritical Fluid Reactive Deposition: Application in the Direct Synthesis of H2O2

Crone,

Trinkies,

Dittmeyer

et al. 2024

Molecules

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In this study, we investigated the catalytic properties of mono- and bimetallic palladium (Pd) and platinum (Pt) nanoparticles deposited via supercritical fluid reactive deposition (SFRD) on titanium dioxide (TiO2) powder. Transmission electron microscopy analyses verified that SFRD experiments performed at 353 K and 15.6 MPa enabled the deposition of uniform mono- and bimetallic nanoparticles smaller than 3 nm on TiO2. Electron-dispersive X-ray spectroscopy demonstrated the formation of alloy-type structures for the bimetallic PdPt nanoparticles. H2O2 is an excellent oxidizing reagent for the production of fine and bulk chemicals. However, until today, the design and preparation of catalysts with high H2O2 selectivity and productivity remain a great challenge. The focus of this study was on answering the questions of (a) whether the catalysts produced are suitable for the direct synthesis of hydrogen peroxide (H2O2) in the liquid phase and (b) how the metal type affects the catalytic properties. It was found that the metal type (Pd or Pt) influenced the catalytic performance strongly; the mean productivity of the mono- and bimetallic catalysts decreased in the following order: Pd > PdPt > Pt. Furthermore, all catalysts prepared by SFRD showed a significantly higher mean productivity compared to the catalyst prepared by incipient wetness impregnation.

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Synthesis of nanostructured composites of metals by supercritical deposition (SCD)

Cited by 6 publications

References 164 publications

TiO₂−CeO_x−Pt Hollow Nanosphere Catalyst for Low‐Temperature CO Oxidation

TiO₂−CeO_x−Pt Hollow Nanosphere Catalyst for Low‐Temperature CO Oxidation

Mechanistic insights into nanoparticle surface-bacterial membrane interactions in overcoming antibiotic resistance

Deposition of Pd, Pt, and PdPt Nanoparticles on TiO2 Powder Using Supercritical Fluid Reactive Deposition: Application in the Direct Synthesis of H2O2

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Synthesis of nanostructured composites of metals by supercritical deposition (SCD)

Cited by 6 publications

References 164 publications

TiO2−CeOx−Pt Hollow Nanosphere Catalyst for Low‐Temperature CO Oxidation

TiO2−CeOx−Pt Hollow Nanosphere Catalyst for Low‐Temperature CO Oxidation

Mechanistic insights into nanoparticle surface-bacterial membrane interactions in overcoming antibiotic resistance

Deposition of Pd, Pt, and PdPt Nanoparticles on TiO2 Powder Using Supercritical Fluid Reactive Deposition: Application in the Direct Synthesis of H2O2

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TiO₂−CeO_x−Pt Hollow Nanosphere Catalyst for Low‐Temperature CO Oxidation

TiO₂−CeO_x−Pt Hollow Nanosphere Catalyst for Low‐Temperature CO Oxidation