Methylene blue dye coated silver–silica nanoparticles with dual functionality fabricated by injection pump and ultrasonochemistry

Veerapandian, Murugan; Yun, Kyusik

doi:10.1016/j.materresbull.2013.01.028

Cited by 10 publications

(3 citation statements)

References 49 publications

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“…We observed after immobilization of 1.25 mg of MB on 1 g of SiO 2 micro-(MB@SiO 2 MPs) and nano-particles (MB@ SiO 2 NPs), a blue shift of the maximum absorbance from 653 to 647 nm (MB@SiO 2 MPs), and to 642 nm (MB@SiO 2 NPs) (Figure 1B). This blue shift has been described in the literature and could be due to electrostatic interactions between MB and surface groups (He et al, 2009;Veerapandian and Yun, 2013) or to disaggregation via surface interaction. We confirmed the noncovalent nature of the interaction by fluorescence microscopy by adding pure SiO 2 particles to a slurry of MB@SiO 2 (1.25 mg/g) and by observing the homogeneous fluorescence of all particles (Figure 1C).…”

Section: Resultssupporting

confidence: 60%

Performances of Homogeneous and Heterogenized Methylene Blue on Silica Under Red Light in Batch and Continuous Flow Photochemical Reactors

et al. 2021

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Methylene blue was efficiently immobilized on silica micro- and nanoparticles by electrostatic interactions and the performances of the heterogenized photocatalysts were compared against the homogeneous conditions using the photooxidation of citronellol as a model reaction under red light, in a batch and a continuous flow photochemical reactor. In batch, the heterogeneous photocatalyst outperforms the homogeneous one, presumably due to kinetic and stability effects. The two catalytic systems are also compared in a flow reactor displaying improved mass transfer properties. We demonstrate that this results in a dramatic enhancement in photocatalyst stability, reactivity and productivity. This study highlights the importance of photocatalyst stability under homogeneous versus heterogenized conditions and in batch versus flow photochemistry.

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Section: Resultssupporting

confidence: 60%

Performances of Homogeneous and Heterogenized Methylene Blue on Silica Under Red Light in Batch and Continuous Flow Photochemical Reactors

et al. 2021

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“…To the above solution, an aqueous mixture containing 4.75 wt.% AgNO 3 and 4.25 wt.% NaBH 4 was injected dropwise, and the solution was ultrasonicated for 30 min. The as-prepared solution was centrifuged, washed twice with ethanol, and dried at 80 °C for 3 h [ 24 ].…”

Section: Methodsmentioning

confidence: 99%

Differential Pulse Voltammetric Electrochemical Sensor for the Detection of Etidronic Acid in Pharmaceutical Samples by Using rGO-Ag@SiO2/Au PCB

et al. 2020

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An rGO-Ag@SiO2 nanocomposite-based electrochemical sensor was developed to detect etidronic acid (EA) using the differential pulse voltammetric (DPV) technique. Rapid self-assembly of the rGO-Ag@SiO2 nanocomposite was accomplished through probe sonication. The developed rGO-Ag@SiO2 nanocomposite was used as an electrochemical sensing platform by drop-casting on a gold (Au) printed circuit board (PCB). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) confirmed the enhanced electrochemical active surface area (ECASA) and low charge transfer resistance (Rct) of the rGO-Ag@SiO2/Au PCB. The accelerated electron transfer and the high number of active sites on the rGO-Ag@SiO2/Au PCB resulted in the electrochemical detection of EA through the DPV technique with a limit of detection (LOD) of 0.68 μM and a linear range of 2.0–200.0 μM. The constructed DPV sensor exhibited high selectivity toward EA, high reproducibility in terms of different Au PCBs, excellent repeatability, and long-term stability in storage at room temperature (25 °C). The real-time application of the rGO-Ag@SiO2/Au PCB for EA detection was investigated using EA-based pharmaceutical samples. Recovery percentages between 96.2% and 102.9% were obtained. The developed DPV sensor based on an rGO-Ag@SiO2/Au PCB could be used to detect other electrochemically active species following optimization under certain conditions.

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“…Similarly, metal and metalloid NPs were demonstrated for cancer therapeutics, diagnosis and antimicrobial applications (Sau and Rogach, 2010;Shakibaie et al, 2010;Sekhon, 2013). Particularly, superparamagnetic iron oxide and silver-silica composite NPs has widespread advantages for drug delivery, wound healing and anti-microbial applications (Veerapandian and Yun, 2013;Laurent et al, 2014). In this trend, integration of polymer species within the metal or metal oxide surfaces played critical role in enhancing the thermal stability, film forming capacity and hydrophobicity/hydrophilicity (Parveen and Sahoo, 2008;Karlsson et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

State-of-Art Bio-Assay Systems and Electrochemical Approaches for Nanotoxicity Assessment

Shinde¹,

Veerapandian

Kaushik

et al. 2020

Front. Bioeng. Biotechnol.

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Methylene blue dye coated silver–silica nanoparticles with dual functionality fabricated by injection pump and ultrasonochemistry

Cited by 10 publications

References 49 publications

Performances of Homogeneous and Heterogenized Methylene Blue on Silica Under Red Light in Batch and Continuous Flow Photochemical Reactors

Performances of Homogeneous and Heterogenized Methylene Blue on Silica Under Red Light in Batch and Continuous Flow Photochemical Reactors

Differential Pulse Voltammetric Electrochemical Sensor for the Detection of Etidronic Acid in Pharmaceutical Samples by Using rGO-Ag@SiO2/Au PCB

State-of-Art Bio-Assay Systems and Electrochemical Approaches for Nanotoxicity Assessment

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