Transforming diatomaceous earth into sensing devices by surface modification with gold nanoparticles

The ability to control light at the nanoscale is at the basis of contemporary photonics and plasmonics. In particular, properly engineered periodic nanostructures not only allow the inhibition of propagation of light at specific spectral ranges or its confinement in nanocavities or waveguides, but make also possible field enhancement effects in vibrational, Raman, infrared and fluorescence spectroscopies, paving the way to the development of novel high-performance optical sensors. All these devices find an impressive analogy in nearly-periodic photonic nanostructures present in several plants, animals and algae, which can represent a source of inspiration in the development and optimization of new artificial nano-optical systems. Here we present the main properties and applications of cutting-edge nanostructures starting from several examples of natural photonic architectures, up to the most recent technologies based on metallic and dielectric metasurfaces.

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“…Reproduced with permission from Ref. [75]. Detailed sectional (h) and top (i) view of a centric diatom valve.…”

Section: Living Photonic Crystals: the Case Of Diatomsmentioning

confidence: 99%

Frontiers of light manipulation in natural, metallic, and dielectric nanostructures

et al. 2021

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“…and control of environmental hazards. 55,56 Polyethylene glycol (PEG)-modified diatomite decorated with gold nanoparticles by one-pot liquid-phase synthesis demonstrated potential for usage as advanced nanodevices adding imaging features to the nanocomplexes. 57 Recently, Bracen ˜o et al showed that diatom biosilica modified with gold nanoparticles by in situ and ex situ methods represents a promising candidate for controlled release of the gentamicin in simulated body fluids.…”

Section: Introductionmentioning

confidence: 99%

“…It was also demonstrated that diatom shells functionalized with gold nanoparticles via a photo-deposition process could be used for the harvesting and detection of biological analytes, such as bovine serum albumin (BSA), and chemical pollutants (mineral oil) in low dilutions down to 10 −16 M for BSA and 50 ppm for mineral oil leading to applications in biotechnology, medicine, safety, monitoring and control of environmental hazards. 55,56 Polyethylene glycol (PEG)-modified diatomite decorated with gold nanoparticles by one-pot liquid-phase synthesis demonstrated potential for usage as advanced nanodevices adding imaging features to the nanocomplexes. 57 Recently, Braceño et al showed that diatom biosilica modified with gold nanoparticles by in situ and ex situ methods represents a promising candidate for controlled release of the gentamicin in simulated body fluids.…”

Section: Introductionmentioning

confidence: 99%

A SERS platform based on diatomite modified by gold nanoparticles using a combination of layer-by-layer assembly and a freezing-induced loading method

Cvjetinovic

Merdalimova

Kirsanova

et al. 2022

Phys. Chem. Chem. Phys.

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“…Diatomaceous earth is a naturally occurring material formed by the accumulation of Bacillariophyceae, composed of fossilized diatom shells (SiO2 about 70%) characterized by highly complex surface porosity (80-90% voids) with highly symmetrical patterns [20][21][22]. It is characterized by interesting mechanical and optical properties thanks to Egyptian Journal of Chemistry http://ejchem.journals.ekb.eg/ _____________________________________________________________________________________________________________ ______________________________________________ Egypt.…”

Section: Introductionmentioning

confidence: 99%

Valorization of diatomaceous earth as a sustainable eco-coagulant for wastewater treatment: optimization by response surface methodology

et al. 2022

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The use of natural, eco-friendly coagulant-flocculants in wastewater treatment can help to reduce suspended particles in a way that includes less exhaustible materials with minimal adverse effects on the environment. Hence, this study is to investigate raw diatomaceous earth (diatomite) as a sustainable ecological coagulant to reduce colloids and suspended matter in wastewater and optimize the coagulation process parameters to improve efficiency, save energy consumption, and reduce costs in the urban sewage treatment plants. The Box-Behnken response surface design was applied to model the individual and combined interactions between four variable factors (initial pH, coagulant dose, coagulation speed, and coagulation time) and their effect on turbidity removal efficiency and final pH of water. Results showed that diatomite has excellent efficiency in reducing the turbidity of wastewater; Elimination reached a maximum of 85.74%. The optimal operating conditions for reducing energy consumption and cost of the operation while improving turbidity removal effectiveness and achieving a neutral final pH to avoid a post-adjustment are an initial pH of 7, a dose of diatomite of 0.5 g/L of effluent, and a coagulation speed of 100 rpm for 3 min. It results in 72.6% turbidity removal and a pH of 7.27. diatomaceous earth shows very usefully for reducing the turbidity of the sewage in the urban wastewater treatment plant.

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Transforming diatomaceous earth into sensing devices by surface modification with gold nanoparticles

Cited by 8 publications

References 15 publications

Frontiers of light manipulation in natural, metallic, and dielectric nanostructures

Frontiers of light manipulation in natural, metallic, and dielectric nanostructures

A SERS platform based on diatomite modified by gold nanoparticles using a combination of layer-by-layer assembly and a freezing-induced loading method

Valorization of diatomaceous earth as a sustainable eco-coagulant for wastewater treatment: optimization by response surface methodology

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