pH effect on the aggregation of silver nanoparticles synthesized by chemical reduction

Alqadi, M. K.; Noqtah, O. A. Abo; Alzoubi, F. Y.; Al-Zou’by, Jehad; Aljarrah, Khaled

doi:10.2478/s13536-013-0166-9

Cited by 150 publications

(87 citation statements)

References 9 publications

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“…Moreover, the shape of silver nanoparticles is more spherical what suggest obtaining the silver crystallites with higher symmetry. It is notable that the results of the pH influence on nanoparticles signalized in this work are in good agreement with the results obtained in the literature (Alqadi et al 2014). The particle analysis from AFM data was performed to detect and measure the lateral and vertical dimensions of particles supported on the pyrogenic silica surfaces for samples prepared at pH 8 and pH 3.…”

Section: Imaging the Silver Nanoparticles Morphology: Tapping Mode Ofsupporting

confidence: 89%

Silica nanocomposites based on silver nanoparticles-functionalization and pH effect

2018

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Current reports in the field of nanotechnology indicate that the properties of metal nanoparticles are determined by their features such as size, shape, composition as well as a degree of crystallinity and stability. These, in turn, may depend heavily on their preparation way, treatment during and after synthesis and finally on properties of the supports and matrices. The goal of presented work was to determine the shape, size, and distribution of silver nanoparticles depending on preparation conditions. In particular, the issues of the formation of silver nanostructures (AgNP) with various shapes and sizes depending on functionalized silica surface as well as on the conditions of the impregnation step by noble metal ions (especially pH) were considered. In particular, the comprehensive approach to determine the impact of pH conditions on the properties of metallic nanoparticles is laid down in this work. Three types of fumed silica materials were selected as the supports of silver nanostructures (Aerosil 150, Aerosil 300 and Silochrom C-120). Silica materials were chemically functionalized by thiol and amine groups and treated with diamminesilver(I) ions [Ag(NH 3 ) 2 ] + . As a result of their reduction silicas adorned with silver nanostructures were obtained. In this work, the AgNP in the form of very small nanoparticles, longitudinal and spherical forms and greater structures with nondescript shape were successfully received and characterized through changing the form of functional groups on the solid surface by adjusting the pH conditions. It turns out that protonation and deprotonation of thiol, amino, and hydroxyl groups can be responsible for possible interactions between noble metal ions and functional groups in the form of both attractive and repulsive electrostatic interactions. The Ag nanoparticle/silica nanocomposites were investigated by X-ray diffraction, atomic force microscopy, potentiometric titration and X-ray photoelectron spectroscopy.

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Section: Imaging the Silver Nanoparticles Morphology: Tapping Mode Ofsupporting

confidence: 89%

Silica nanocomposites based on silver nanoparticles-functionalization and pH effect

2018

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“…Cys-capped AgNPs were prepared by the reduction of silver salt (AgNO 3 ) with sodium borohydride (NaBH 4 ) as described in given literatures [46,47,48,49]. A 100 mL of 1.0 Â10 À3 M aqueous solution of AgNO 3 was taken in a 250 mL conical flask.…”

Section: Synthesis Of Cys-capped Agnpsmentioning

confidence: 99%

L-cysteine modified silver nanoparticles for selective and sensitive colorimetric detection of vitamin B1 in food and water samples

Khalkho

Kurrey

Deb

et al. 2020

Heliyon

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The use of L-cysteine modified silver nanoparticles (Cys-capped AgNPs) as a colorimetric probe for determination of vitamin B1 (thiamine) is described in the present work. This method is based on the measurement of red shift of localized surface plasmon resonance (LSPR) band of Cys-capped AgNPs in the region of 200-800 nm. The color of Cys-capped AgNPs was changed from yellow to colorless by the addition of vitamin B1. The mechanism for detection of vitamin B1 is based on the electrostatic interaction between positively charged vitamin B1, which causes the red shift of LSPR band from 390 nm to 580 nm. The interaction between Cys-capped AgNPs and vitamin B1 was theoretically explored by density function theory (DFT) using LANL2DZ basis sets with help of Gaussian 09 (C.01) program. The morphology, size distribution and optical properties of Cys-capped AgNPs were characterized by transmission electron microscope (TEM), UV-Visible spectrophotometry, Fourier transform infrared spectroscopy (FTIR) and dynamic light scattering (DLS) techniques. The method is linear in the range of 25-500 μg mL À1 with correlation coefficient (R 2) 0.992 and limit of detection of 7.0 μg mL À1. The advantages of using Cys-capped AgNPs as a chemical sensor in colorimetry assay are being simple, low cost and selective for detection of vitamin B1 from food (peas, grapes and tomato) and environmental (river, sewage and pond) water samples.

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“…Such aggregation or agglomeration was also observed in nontumor Lep3 cells under their exposure to GO and GO-NH 2 particles (data not shown), suggesting that aggregation of GO-particles is not dependent on the cell type but mainly on the particles type. Many types of NPs have been reported to form aggregates in physiological solutions [39] including carbon-based nanoparticles [34]. GO-NH 2 aggregates were clearly visible in the cell culture media because the larger aggregates cannot pass across the cell membrane due to their large size and they remain in cells surrounding.…”

Section: Characterization Of Go and Go-nhmentioning

confidence: 99%

Cytotoxicity Evaluation of Ammonia-Modified Graphene Oxide Particles in Lung Cancer Cells and Embryonic Stem Cells

Keremidarska-Markova

Hristova-Panusheva

Andreeva

et al. 2018

Advances in Condensed Matter Physics

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Potential toxicity of graphene oxide (GO) is a subject of increasing research interest in the recent years. Here, we have evaluated the cytotoxicity of ammonia-modified GO (GO-NH2) and pristine GO particles in human lung cancer cells, A549 and embryonic stem cells, Lep3 exposed to different particles concentrations (0.1, 1, 10, 20, and 50 μg/ml) for different times (24 and 48h). Compared with GO, GO-NH2 particles possessed smaller size, positive surface charge and higher thickness. An increased propensity to aggregation in cell cultures was also found for GO-NH2 particles. Cytotoxicity evaluation revealed that GO-NH2 particles are more toxic than pristine GO. Applied at concentrations of 10, 20 and 50 μg/ml for 24h they affect significantly cell morphology of viable embryonic stem cells whereas human lung cancer A549 cells seem to be relatively more resistant to short-time exposure. After 48h exposure however cell proliferation of A549 cells was strongly suppressed in a dose-dependent manner while the proliferation ability of embryonic stem cells was not affected. These results suggested that both GO particles exert different degree of cytotoxicity which is time, dose and cell dependent. In general, ammonia-modified GO particles are more toxic than the pristine GO which should be taken into account for future biomedical applications.

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pH effect on the aggregation of silver nanoparticles synthesized by chemical reduction

Cited by 150 publications

References 9 publications

Silica nanocomposites based on silver nanoparticles-functionalization and pH effect

Silica nanocomposites based on silver nanoparticles-functionalization and pH effect

L-cysteine modified silver nanoparticles for selective and sensitive colorimetric detection of vitamin B1 in food and water samples

Cytotoxicity Evaluation of Ammonia-Modified Graphene Oxide Particles in Lung Cancer Cells and Embryonic Stem Cells

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