Gold nanoparticles deposited on silica microparticles - Electrokinetic characteristics and application in SERS

Lupa, Dawid; Oćwieja, Magdalena; Piergies, Natalia; Baliś, Andrzej; Paluszkiewicz, C.; Adamczyk, Zbǐgniew

doi:10.1016/j.colcom.2019.100219

Cited by 20 publications

(15 citation statements)

References 42 publications

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“…The limiting coverage was found to be equal to 0.23 and 0.31 for the ionic strength equal to 10 –4 and 10 –3 m , respectively. It should be pointed out that these values are in good agreement with those previously reported for the AuNPs deposited at the SiO 2 Ps of diameter equal to 650 nm [ 47 ] and HNPs immobilized at the PsMs of size equal to 800 nm. [ 38 ] The observed trend of decreasing nanoparticle coverage with ionic strength was also observed for planar interfaces [ 48,49 ] and can be attributed to the increased electrostatic screening of lateral interactions among immobilized nanoparticles.…”

Section: Resultssupporting

confidence: 91%

“…[ 38 ] The observed trend of decreasing nanoparticle coverage with ionic strength was also observed for planar interfaces [ 48,49 ] and can be attributed to the increased electrostatic screening of lateral interactions among immobilized nanoparticles. One should mention that results presented in the aforementioned works [ 38,47 ] were acquired at a temperature equal to 298 K. Therefore, one can conclude that the influence of the temperature on the maximum attained coverage of nanoparticle monolayer is negligible. So far, no literature data concerning the validity of the electrokinetic model at the elevated temperatures are available.…”

Section: Resultsmentioning

confidence: 95%

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Hematite/Polystyrene Raspberry‐Like Microcomposites as Stable Support for Silver Nanoparticle Immobilization

Lupa

Oćwieja

Adamczyk

2021

Part & Part Syst Charact

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Among the methods utilized for the preparation of raspberry‐like microcomposites, due to its simplicity and universality, the electrostatically‐driven deposition of nanoparticles at the surface of microparticles is especially attractive. This process, leading to the formation of a single nanoparticle monolayer, is widely reported. On the other hand, no data concerning the electrostatically‐driven formation of nanoparticle bilayers at the surface of microparticles are reported. To fill this gap, the detailed investigation of the formation of silver/hematite nanoparticle bilayers at the surface of polystyrene microparticles is reported. First, the hematite/polystyrene raspberry‐like microcomposites are obtained by immobilization of hematite nanoparticles under an electrostatically‐driven process. The stability of hematite/polystyrene microcomposites at elevated temperatures up to 323 K is monitored using microelectrophoresis. No significant changes in the hematite nanoparticle layer coverage are observed after prolonged time of incubation. This proves the irreversible character of nanoparticle immobilization. Next, the hematite/polystyrene microcomposites are utilized as the interfaces for immobilization of negatively charged silver nanoparticles. This process is quantitatively described using electrokinetic measurements. The changes in the hydrodynamic diameter of microcomposites are also determined. Finally, the validity of the electrokinetic model used in this work for predicting the zeta potential of the silver/hematite/polystyrene microcomposites is confirmed.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 95%

Hematite/Polystyrene Raspberry‐Like Microcomposites as Stable Support for Silver Nanoparticle Immobilization

Lupa

Oćwieja

Adamczyk

2021

Part & Part Syst Charact

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“…Once the solution became red, indicating the NPs formation, a solution of cysteamine hydrochloride was added as stabilizing agent. 61,62 The same approach has been used to produce Ag NPs that were further stabilized by the addition of Lcysteine. In this case, sodium borohydride was added dropwise to a silver nitrate solution under stirring.…”

Section: Small Moleculesmentioning

confidence: 99%

Positively-charged plasmonic nanostructures for SERS sensing applications

et al. 2022

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“…The data suggest that the WDE from beer filtration is a suitable material for NP biosynthesis. The WDE contains a homogeneous composition of both organic and inorganic substances and we assume that the organic component would reduce Au ions to Au 0 , stabilize Au NPs, while the porous silica surface would serve as a perfect matrix for their anchoring (Konvičková et al 2016;Kratošová et al 2016;Lupa et al 2019). Generally, anchored NPs are more suitable for certain applications than colloidal systems.…”

Section: Waste Diatomite Earth Characterizationmentioning

confidence: 99%

“…The WDE from beer filtration is composed mainly of diatomite earth which is covered with yeast cell debris (Anders and Alwaeli 2015 ). The residual yeast presence is beneficial for biosynthesis and stabilization of Au NPs, and the porous surface of diatomaceous earth is excellent for their attachment by electrostatic interactions (Lupa et al 2019 ). The combination of Au NP properties with chemically stable silica support creates a functional nanocomposite for heterogenous catalysis (Sosa et al 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Effective and reproducible biosynthesis of nanogold-composite catalyst for paracetamol oxidation

Krbečková

Šimonová

Langer

et al. 2022

Environ Sci Pollut Res

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Pharmaceutical products are some of the most serious emergent pollutants in the environment, especially nowadays of the COVID-19 pandemic. In this study, nanogold-composite was prepared, and its catalytic activity for paracetamol degradation was investigated. Moreover, for the first time, recycled waste diatomite earth (WDE) from beer filtration was used for reproducible gold nanoparticle (Au NPs) preparation. We studied Au NPs by various psychical-chemical and analytical methods. Transmission and scanning electron microscopy were used for nanogold-composite morphology, size and shape characterization. Total element concentrations were determined using inductively coupled plasma mass and X-ray fluorescence spectrometry. X-ray powder diffraction analysis was used for crystal structure characterization of samples. Fourier transform infrared spectrometer was used to study the chemical changes before and after Au NP formation. The results revealed that the WDE served as both a reducing and a stabilizing agent for crystalline spherical 30 nm Au NPs as well as acting as a direct support matrix. The kinetics of paracetamol degradation was studied by high-performance liquid chromatography with a photodiode array detector. The conversion of paracetamol was 62% and 67% after 72 h in the absence or presence of light irradiation, respectively, with 0.0126 h −1 and 0.0148 h −1 reaction rate constants. The presented study demonstrates the successful use of waste material from the food industry for nanogold-composite preparation and its application as a promising catalyst in paracetamol removal. Graphical abstract Supplementary Information The online version contains supplementary material available at 10.1007/s11356-022-21868-6.

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Gold nanoparticles deposited on silica microparticles - Electrokinetic characteristics and application in SERS

Cited by 20 publications

References 42 publications

Hematite/Polystyrene Raspberry‐Like Microcomposites as Stable Support for Silver Nanoparticle Immobilization

Hematite/Polystyrene Raspberry‐Like Microcomposites as Stable Support for Silver Nanoparticle Immobilization

Positively-charged plasmonic nanostructures for SERS sensing applications

Effective and reproducible biosynthesis of nanogold-composite catalyst for paracetamol oxidation

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