Photophysical properties of methylene blue in water and in aqueous solutions of dimethylsulfoxide

Citrate-capped silver nanoparticles Ag@Cit NPs were synthesized by a simple plasma-assisted reduction method. Homogenous colloidal Ag@Cit NPs solutions were produced by treating a AgNO3-trisodium citrate-deionized water with an atmospheric-pressure argon plasma jet. The plasma-synthesized Ag@Cit NPs exhibited quasi-spherical shape with an average particle diameter of about 5.9−7.5 nm, and their absorption spectra showed surface plasmon resonance peaks at approximately 406 nm. The amount of Ag@Cit NPs increased in a plasma exposure duration-dependent manner. Plasma synthesis of Ag@Cit NPs was more effective in the 8.5 cm plume jet than in the shorter and longer plume jets. A larger amount of Ag@Cit NPs were produced from the 8.5 cm plume jet with a higher pH and a larger number of aqua electrons, indicating that the synergetic effect between plasma electrons and citrate plays an important role in the plasma synthesis of Ag@Cit NPs. Plasma-assisted citrate reduction facilitates the synthesis of Ag@Cit NPs, and citrate-capped nanoparticles are stabilized in an aqueous solution due to their repulsive force. Next, we demonstrated that plasma-synthesized Ag@Cit NPs exhibited a significant degradation of methylene blue dye.

show abstract

“…Figure 10 a exhibits the absorption spectra of Ag@Cit NP -treated and -untreated

solutions. The corresponding photos of Ag@Cit NP -treated

solutions are displayed in Figure 10 c. The pristine

solution exhibited a broad absorption band with a strong peak at 670 nm and a shoulder at 615 nm [ 55 ]. The 670 nm absorption can be assigned to the

monomer, and the 615 nm absorption can be attributed to the

dimer.…”

Section: Resultsmentioning

confidence: 99%

Influences of Plasma Plume Length on Structural, Optical and Dye Degradation Properties of Citrate-Stabilized Silver Nanoparticles Synthesized by Plasma-Assisted Reduction

2022

View full text Add to dashboard Cite

show abstract

“…Moreover the cationic dye shall interact electrostatically with the anionic FNPs' shell thus respecting the ET distance criterion. Finally MB is known to have quite a low luminescence efficiency (22%) [32], thus if sensitization by FRET occurs introduction of additional fluorescence signal will be limited. We carried out titration experiments to characterize the quenching process of FNPs by MB.…”

Section: Resultsmentioning

confidence: 99%

FRET-mediated quenching of BODIPY fluorescent nanoparticles by methylene blue and its application to bacterial imaging

Grazon

Clavier

et al. 2022

Photochem Photobiol Sci

View full text Add to dashboard Cite

High resolution and a good signal to noise ratio are a requirement in cell imaging. However, after labelling with fluorescent entities, and after several washing steps, there is often an unwanted fluorescent background that reduces the images resolution. For this purpose, we developed an approach to remove the signal from extra-cellular fluorescent nanoparticles (FNPs) during bacteria imaging, without the need for any washing steps. Our idea is to use methylene blue to quench > 90% of the emission of BODIPY-based fluorescent polymer nanoparticle by a FRET process. This "Hide-and-Seek Game" approach offers a novel strategy to apply fluorescence quenching in bioimaging to improve image accuracy.

show abstract

“…ABS polymer was selected as the construction material because of its good thermal and mechanical properties coupled with easy extrusion. 37 The printing parameters were adjusted by the slicing application Ultimaker Cura and the three parts were printed in ABS (SMARTFIL ABS Smart Materials 3D) using an affordable 3D printer Creality Ender 3 (extrusion parameters: nozzle 400 μm, 235 °C, 1.75 mm filament). STL files, detailed drawings, and additional details about Cura slicing parameters are available in the Supporting Information (Table S1).…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The reactor was placed under de LED at a distance of 25 mm. Reaction monitoring was performed by UV–vis spectrometry following the absorbance peak decay at 400 nm for 4NP photoreduction to 4-aminophenol (4AP), and the absorbance lines at 663 nm (monomer) and 615 nm (dimer) for MB photodegradation. , Absorption spectra were collected every minute by using a compact spectrophotometer (Flame, Ocean Optics) with a very low volume flow cell that was placed downstream (dead volume ca. 80 μL).…”

Section: Methodsmentioning

confidence: 99%

Three-Dimensional Printing of Acrylonitrile Butadiene Styrene Microreactors for Photocatalytic Applications

Cabrera

Pellejero

Oroz-Mateo

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Miniaturization is a key aspect for many technological applications and the use of microreactors is an excellent solution for the intensification of chemical processes for a variety of applications. However, standard microfabrication requires large facilities and intricate fabrication protocols, and consequently it is not easily available, generally resulting in high production costs. Herein, we present a very cheap, fast and easy microreactor design for photocatalytic applications based on direct fused filament 3D printing as a facilitating and 2 widespread technology. The microreactor consists of three bodies directly printed in ABS (Acrylonitrile Butadiene Styrene): a main body with a serpentine microchannel pattern where the photocatalyst is placed, a top holder with a transparent polymer window, and a base to clamp the parts. Several microreactor units were coated with TiO 2 doped with Cu (2.4 wt.%) nanoparticles synthesized by FSP (Flame Spray Pyrolysis) and tested for the photocatalytic degradation of two water pollutants showing excellent performance. INTRODUCTIONGreen chemistry is a route toward production sustainability, and microreactors are one of the tools available to make it possible, thanks to their enhanced mass and heat transport properties in comparison to conventional reactors. 1-3 A microreactor is a device with interconnected microchannels in which a chemical reaction is carried out. The inner characteristic dimensions are typically below 1 mm. This miniaturization mainly offers high surface-to-volume ratio, controllable interaction between reactants and mass diffusion, lower energy consumption, excellent heat exchange and temperature control, minimization of light loss in photoreactions, better product selectivity, and the opportunity to integrate processes in an automated manner. [4][5][6] These features make microreactors an ideal solution to handle multiple reaction systems, [7][8][9][10] especially in heterogeneous photocatalysis, where a close interaction between the incident light, catalyst and reactants is much needed and hardly achieved in conventional systems. 11,12 Microreactors, like other microfluidic devices, can be manufactured by different techniques such as standard photolithography, soft lithography, micromolding or laser ablation, and a large variety of construction materials are available, such as silicon, glass, polymers, and metals. 13,14 Mainly, polydimethylsiloxane (PDMS) elastomer has been used as construction material due to its outstanding properties of biocompatibility, flexibility, and optical transparency in the UV-Vis

show abstract

Photophysical properties of methylene blue in water and in aqueous solutions of dimethylsulfoxide

Cited by 43 publications

References 21 publications

Influences of Plasma Plume Length on Structural, Optical and Dye Degradation Properties of Citrate-Stabilized Silver Nanoparticles Synthesized by Plasma-Assisted Reduction

Influences of Plasma Plume Length on Structural, Optical and Dye Degradation Properties of Citrate-Stabilized Silver Nanoparticles Synthesized by Plasma-Assisted Reduction

FRET-mediated quenching of BODIPY fluorescent nanoparticles by methylene blue and its application to bacterial imaging

Three-Dimensional Printing of Acrylonitrile Butadiene Styrene Microreactors for Photocatalytic Applications

Contact Info

Product

Resources

About