scholarly journals Visible Light-Mediated Sustainable Antibacterial Activity and Osteogenic Functionality of Au and Pt Multi-Coated TiO2 Nanotubes

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5976
Author(s):  
Kyoung-Suk Moon ◽  
Young-Bum Park ◽  
Ji-Myung Bae ◽  
Eun-Joo Choi ◽  
Seung-Han Oh
Keyword(s):  
Antibacterial Activity ◽  
Visible Light ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metals ◽  
Human Mesenchymal Stem Cells ◽  
Antibacterial Activities ◽  
Titania Nanotubes ◽  
Noble Metal Nanoparticles ◽  
Low Level Laser Therapy

The visible light reactions of noble metal-based photocatalysts have been increasingly utilized to investigate their antibacterial activities. Furthermore, the photoreactions at various visible light wavelengths for specific combinations of titania nanotubes and noble metal nanoparticles have been found to promote osteogenic functionality. In this investigation, a novel multi-coating combination of noble metals (gold and platinum) on titania nanotubes was assessed using plasmonic photocatalysis and low-level laser therapy at 470 and 600 nm. The results showed that this coating on the nanotubes promoted antibacterial activity and osteogenic functionality. The order in which the gold and platinum coatings were layered onto the titania nanotubes strongly affected the osteogenic performance of the human mesenchymal stem cells. These results have identified a new approach for the development of efficient novel combinations of noble metal nanoparticles and titania nanotubes with visible light responses, sustainable antimicrobial activity, and osteogenic functionality.

scholarly journals Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

2018 ◽  
Vol 9 ◽  
pp. 2763-2774 ◽  
Author(s):  
Alexander Rostek ◽  
Marina Breisch ◽  
Kevin Pappert ◽  
Kateryna Loza ◽  
Marc Heggen ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metals ◽  
Biological Effects ◽  
Human Mesenchymal Stem Cells ◽  
Average Diameter ◽  
Vinyl Pyrrolidone ◽  
Noble Metal Nanoparticles ◽  
Spherical Average ◽  
Size And Morphology

For a comparative cytotoxicity study, nanoparticles of the noble metals Rh, Pd, Ag, Pt, and Au (spherical, average diameter 4 to 8 nm) were prepared by reduction in water and colloidally stabilized with poly(N-vinyl pyrrolidone) (PVP). Thus, their shape, size, and surface functionalization were all the same. Size and morphology of the nanoparticles were determined by dynamic light scattering (DLS), analytical disc centrifugation (differential centrifugal sedimentation, DCS), and high-resolution transmission electron microscopy (HRTEM). Cell-biological experiments were performed to determine the effect of particle exposure on the viability of human mesenchymal stem cells (hMSCs). Except for silver, no adverse effect of any of the metal nanoparticles was observed for concentrations up to 50 ppm (50 mg L−1) incubated for 24 h, indicating that noble metal nanoparticles (rhodium, palladium, platinum, gold) that do not release ions are not cytotoxic under these conditions.

Plasmonic photocatalysts: harvesting visible light with noble metal nanoparticles

2012 ◽  
Vol 14 (28) ◽  
pp. 9813 ◽  
Author(s):  
Peng Wang ◽  
Baibiao Huang ◽  
Ying Dai ◽  
Myung-Hwan Whangbo
Keyword(s):  
Visible Light ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metal Nanoparticles

scholarly journals Biocompatibility and photo-induced antibacterial activity of lignin-stabilized noble metal nanoparticles

RSC Advances ◽  
2018 ◽  
Vol 8 (70) ◽  
pp. 40454-40463 ◽  
Author(s):  
Diamela María Rocca ◽  
Julie P. Vanegas ◽  
Kelsey Fournier ◽  
M. Cecilia Becerra ◽  
Juan C. Scaiano ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Antimicrobial Properties ◽  
Noble Metal Nanoparticles ◽  
Stabilizing Agents

Natural derived compounds, lignins, can be used as reducing and stabilizing agents to synthesize noble metal nanoparticles with antimicrobial properties.

scholarly journals Plasmon Assisted Highly Efficient Visible Light Catalytic CO2 Reduction Over the Noble Metal Decorated Sr-Incorporated g-C3N4

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Muhammad Humayun ◽  
Habib Ullah ◽  
Lang Shu ◽  
Xiang Ao ◽  
Asif Ali Tahir ◽  
...  
Keyword(s):  
Visible Light ◽  
Noble Metal ◽  
Light Absorption ◽  
Density Functional ◽  
Noble Metals ◽  
Resonance Effect ◽  
Noble Metal Nanoparticles ◽  
Localized Surface Plasmon ◽  
High Quantum Efficiency ◽  
Conversion Performance

AbstractThe photocatalytic performance of g-C3N4 for CO2 conversion is still inadequate by several shortfalls including the instability, insufficient solar light absorption and rapid charge carrier’s recombination rate. To solve these problems, herein, noble metals (Pt and Au) decorated Sr-incorporated g-C3N4 photocatalysts are fabricated via the simple calcination and photo-deposition methods. The Sr-incorporation remarkably reduced the g-C3N4 band gap from 2.7 to 2.54 eV, as evidenced by the UV–visible absorption spectra and the density functional theory results. The CO2 conversion performance of the catalysts was evaluated under visible light irradiation. The Pt/0.15Sr-CN sample produced 48.55 and 74.54 µmol h−1 g−1 of CH4 and CO, respectively. These amounts are far greater than that produced by the Au/0.15Sr-CN, 0.15Sr-CN, and CN samples. A high quantum efficiency of 2.92% is predicted for the Pt/0.15Sr-CN sample. Further, the stability of the photocatalyst is confirmed via the photocatalytic recyclable test. The improved CO2 conversion performance of the catalyst is accredited to the promoted light absorption and remarkably enhanced charge separation via the Sr-incorporated mid gap states and the localized surface plasmon resonance effect induced by noble metal nanoparticles. This work will provide a new approach for promoting the catalytic efficiency of g-C3N4 for efficient solar fuel production.

Moxifloxacin-capped noble metal nanoparticles as potential urease inhibitors

2015 ◽  
Vol 39 (10) ◽  
pp. 8080-8086 ◽  
Author(s):  
Muhammad Nisar ◽  
Shujaat Ali Khan ◽  
Muhammad Raza Shah ◽  
Ajmal Khan ◽  
Umar Farooq ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Antibacterial Activity ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metal Nanoparticles ◽  
Urease Inhibitors ◽  
Urease Inhibition ◽  
Silver And Gold Nanoparticles

The fluoroquinolone drug moxifloxacin (Mox) has been used to protect silver and gold nanoparticles. The nano-conjugates exhibited urease inhibition and antibacterial activity.

A universal approach to the synthesis of nanodendrites of noble metals

Nanoscale ◽  
2014 ◽  
Vol 6 (11) ◽  
pp. 6173-6179 ◽  
Author(s):  
Yan Feng ◽  
Xiaohong Ma ◽  
Lin Han ◽  
Zhijian Peng ◽  
Jun Yang
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metals ◽  
Noble Metal Nanoparticles ◽  
Universal Approach ◽  
Dendritic Structures

A universal approach was demonstrated for the synthesis of noble metal nanoparticles with dendritic structures.

Surface state modulation for size-controllable photodeposition of noble metal nanoparticles on semiconductors

2020 ◽  
Vol 8 (40) ◽  
pp. 21094-21102
Author(s):  
Lei Huang ◽  
Xiu Liu ◽  
Haocheng Wu ◽  
Xiuli Wang ◽  
Hongmin Wu ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Surface State ◽  
Noble Metals ◽  
Surface States ◽  
Noble Metal Nanoparticles ◽  
Size Distributions

The size distributions of noble metals on semiconductors can be precisely controlled by the photodeposition method with modulated surface states.

A seed-mediated approach to the general and mild synthesis of non-noble metal nanoparticles stabilized by a metal–organic framework for highly efficient catalysis

2015 ◽  
Vol 2 (6) ◽  
pp. 606-612 ◽  
Author(s):  
Yu-Zhen Chen ◽  
Linfeng Liang ◽  
Qihao Yang ◽  
Maochun Hong ◽  
Qiang Xu ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metals ◽  
Metal Organic Framework ◽  
Catalytic Performance ◽  
Noble Metal Nanoparticles ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Metal Organic ◽  
Seed Mediated

A novel noble metal-seed-mediated approach to reduce non-noble metals under mild conditions to afford non-noble metal NPs with superior catalytic performance.

scholarly journals Visible Light-Enhanced Antibacterial and Osteogenic Functionality of Au and Pt Nanoparticles Deposited on TiO2 Nanotubes

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3721 ◽  
Author(s):  
Kyoung-Suk Moon ◽  
Eun-Joo Choi ◽  
Ji-Myung Bae ◽  
Young-Bum Park ◽  
Seunghan Oh
Keyword(s):  
Antibacterial Activity ◽  
Visible Light ◽  
Noble Metal ◽  
Visible Light Irradiation ◽  
Tio2 Nanotubes ◽  
Pt Nanoparticles ◽  
Light Irradiation ◽  
Noble Metal Nanoparticles ◽  
Activity Test ◽  
Tio2 Nts

This study aimed at evaluating the visible light mediated antimicrobial and osteogenic applications of noble metal, such as gold (Au) and platinum (Pt) coated titania (TiO2) nanotubes (NTs). In this study, the Au and Pt nanoparticles (NPs) were deposited on anodized 100 nm TiO2 NTs by ion plasma sputtering. The Au and Pt NPs were mainly deposited on the top surface layer of TiO2 NTs and showed light absorbance peaks around the 470 and 600 nm visible light region used in this study, as seen from the surface characterization. From the results of antibacterial activity test, Au and Pt NPs that were deposited on TiO2 NTs showed excellent antibacterial activity under 470 nm visible light irradiation due to the plasmonic photocatalysis based on the localized surface plasmon resonance effect of the Au and Pt NPs. In addition, alkaline phosphate activity test and quantitative real-time PCR assay of osteogenic related genes resulted that these NPs promoted the osteogenic functionality of human mesenchymal stem cells (hMSCs) under 600 nm visible light irradiation, because of the synergic effect of the photothermal scattering of noble metal nanoparticles and visible light low-level laser therapy (LLLT). Therefore, the combination of noble metal coated TiO2 NTs and visible light irradiation would be expected to perform permanent antibacterial activity without the need of an antibacterial agent besides promoting osteogenic functionality.

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