“…They possess potential applications in various fields such as catalysis, optoelectronics, antibacterial activity, and electronics (Srinoi et al 2018). Among them, BNPs are well known and gained great importance and interest with their enhanced optical, electrical, and catalytic properties compared to the singlecomponent nanoparticles (NPs) due to their composition and synergistic effects (Sharma et al 2015;Suwannarat et al 2018). In comparison with the metal NPs, the BNPs are cost-effective, provided the materials, synthesis, and characteristics are leveraged well with their potential usage in electrical, catalytic, and heat transfer applications.…”
Section: Introductionmentioning
confidence: 99%
“…Aromatic nitro compounds are of great importance in industries, since most of the dyes, drugs, pesticides, etc., are manufactured using these compounds. Still, the reduction of aromatic nitro compounds to amino compounds before their disposal to the environment is also equally crucial since aromatic nitro compounds are toxic (Suwannarat et al 2018). Metallic NPs are successfully used in the catalytic reduction of 4-nitrophenol to 4-aminophenol to a certain extent of success.…”
Bimetallic nanoparticles (BNPs) have drawn significant attention due to their numerous applications. They demonstrate enhanced optical, electrical, thermal, and catalytic properties due to the synergistic effects of monometals present in them. In this work, CuAg and AuAg BNPs have been synthesized using a facile and economical chemical reduction method. Optical characterization was carried out using UV–visible spectroscopy, and effect of pH on optical absorbance was studied. For CuAg and AuAg BNPs, optimum pH was observed to be at 9.4 and 6.39, respectively. Morphological investigation confirms the average diameters of CuAg and AuAg BNPs were to be 65 nm and 30 nm, respectively. Photocatalytic property illustrates the reduction of 4-nitrophenol to 4-aminophenol with a 92% conversion percentage in the presence of CuAg BNPs in 4 min, and rate constant for the reaction was measured to be 8.98 × 10–3 s−1. But for the AuAg BNPs, the conversion percentage was 97% in 8 min and rate constant was found to be 7.95 × 10–3 s−1. Thermal conductivity and viscosity measurements of the nanofluids obtained with CuAg and AuAg BNPs have ascertained them to be efficient candidates for the heat transfer and catalytic applications.
Graphic abstract
“…They possess potential applications in various fields such as catalysis, optoelectronics, antibacterial activity, and electronics (Srinoi et al 2018). Among them, BNPs are well known and gained great importance and interest with their enhanced optical, electrical, and catalytic properties compared to the singlecomponent nanoparticles (NPs) due to their composition and synergistic effects (Sharma et al 2015;Suwannarat et al 2018). In comparison with the metal NPs, the BNPs are cost-effective, provided the materials, synthesis, and characteristics are leveraged well with their potential usage in electrical, catalytic, and heat transfer applications.…”
Section: Introductionmentioning
confidence: 99%
“…Aromatic nitro compounds are of great importance in industries, since most of the dyes, drugs, pesticides, etc., are manufactured using these compounds. Still, the reduction of aromatic nitro compounds to amino compounds before their disposal to the environment is also equally crucial since aromatic nitro compounds are toxic (Suwannarat et al 2018). Metallic NPs are successfully used in the catalytic reduction of 4-nitrophenol to 4-aminophenol to a certain extent of success.…”
Bimetallic nanoparticles (BNPs) have drawn significant attention due to their numerous applications. They demonstrate enhanced optical, electrical, thermal, and catalytic properties due to the synergistic effects of monometals present in them. In this work, CuAg and AuAg BNPs have been synthesized using a facile and economical chemical reduction method. Optical characterization was carried out using UV–visible spectroscopy, and effect of pH on optical absorbance was studied. For CuAg and AuAg BNPs, optimum pH was observed to be at 9.4 and 6.39, respectively. Morphological investigation confirms the average diameters of CuAg and AuAg BNPs were to be 65 nm and 30 nm, respectively. Photocatalytic property illustrates the reduction of 4-nitrophenol to 4-aminophenol with a 92% conversion percentage in the presence of CuAg BNPs in 4 min, and rate constant for the reaction was measured to be 8.98 × 10–3 s−1. But for the AuAg BNPs, the conversion percentage was 97% in 8 min and rate constant was found to be 7.95 × 10–3 s−1. Thermal conductivity and viscosity measurements of the nanofluids obtained with CuAg and AuAg BNPs have ascertained them to be efficient candidates for the heat transfer and catalytic applications.
Graphic abstract
“…Such a visible change of color confirms the reduction of metals to the nanoform. The similar studies conducted Paul et al [8] and Suwannarat et al [13], which synthesized Ag/Au/Pd nanoparticles for reduction of 4-nitrophenol.…”
Section: Uv-vis Studies Of Au/cuo/zno Nanoparticlesmentioning
As biological synthesis has become an alternative to chemical and physical methods for synthesizing nanoparticles, this work describes the synthesis of Au/CuO/ZnO nanoparticles using Verbena officinalis extract. The synthesized Au/CuO/ZnO nanoparticles were characterized using Ultraviolet–Visible, Fourier Transform-Infrared, Transmission Electron Microscopy and Atomic Force Microscopy. The influence of Au/CuO/ZnO nanoparticles on cell viability was evaluated in vitro, using the established cell line – Jurkat (ATCC® TIB-152™). The Annexin V binding test confirmed the previous results of the MTT assay, which indicate that the studied complex of Au/CuO/ZnO nanoparticles has a strong cytotoxic effect on the Jurkat cell line. The type of death and the effectiveness of cell elimination depended both on the concentration of the complex and the duration of culture.
“…In tested sample, the peaks were observed which confirmed the presence of three metals nanoparticles. Scanning microscopy made it possible to observe and confirm the presence of spherical particles that were locally agglomerated due to the presence of ZnO nanoparticles [ 35 ]. Fig.…”
Metal combinations have been attracting the attention of scientists for some time. They usually exhibit new characteristics that are different from the ones possessed by their components. In this work, Au/ZnO/Ag nanoparticles were synthesized biologically using Glechoma hederacea L. extract. The synthesized Au/ZnO/Ag nanoparticles were characterized by UV-Vis, Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), and Atomic Force Microscopy (AFM). The microscopic methods confirmed the presence of spherical nanoparticles of 50–70 nm. The influence of biologically synthesized Au/ZnO/Ag nanoparticles on the vitality of human cells was evaluated in vitro with the use of established human Acute T Cell Leukemia cell line, Jurkat (ATCC® TIB-152™), as well as mononuclear cells isolated from peripheral blood (PBMC) of voluntary donors. Cell survival and the half-maximal inhibitory concentration index (IC50) were analyzed by the MTT test. The studies showed that the total loss of cell viability occurred at the Au/ZnO/Ag nanoparticle concentration range of 10 µmol–50 µmol. The use of Au/ZnO/Ag nanoparticles at the concentration of 100 µmol eliminated almost all living cells from the culture in 24h. The above observation confirms the result obtained during the MTT test.
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