Investigations on structural and optical properties of chalcone dendrimer in Ag@TiO2 core–shell nanoparticles

Vijayalakshmi, R.; Selvarani, Sivasamy; Kumar, P. Praveen; Rajakumar, Perumal; Ravichandran, K.

doi:10.1007/s00339-018-2177-1

Cited by 12 publications

(7 citation statements)

References 27 publications

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“…Rietveld refinement procedures were applied to XRD patterns using the DBWSTools 2.3 interface . The crystallite size and dislocation concentration of the samples were calculated using the size–strain plot method. − The particle size and morphology were observed using field-emission scanning electron microscopy (FE-SEM) (Zeiss SUPRA TM-40, Carl Zeiss), through the detector in-lens (SE) and also addition of a quadrant backscattered electron detector (QBSD) at 30 kV accelerating voltage, and transmission electron microscopy (TEM), and selected area electron diffraction (SAED) (Tecnai-Spirit-G2-120 kV, and Tecnai-TF20-200 kV, FEI Co.). The interplanar spacings and approximate particle sizes of the ZnO nanoparticles were obtained using the software Digital Micrograph (Gatan Software, Inc.) over the TEM images.…”

Section: Experimental Sectionmentioning

confidence: 99%

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [V_Zn+V_O⁺] Defects in Self-Assembled ZnO Nanoparticles

et al. 2021

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Defect influences on the photoactivity of ZnO nanoparticles prepared by a powdered coconut water (ACP) assisted synthesis have been studied. The crystalline phase and morphology of ZnO nanoparticles were effectively controlled by adjusting the calcination temperature (400−700 °C). An induced transition of hybrid Zn 5 (CO 3 ) 2 (OH) 6 /ZnO nanoparticles to single-phase ZnO nanoparticles was obtained at 480 °C. The morphological analysis revealed a formation of ZnO nanoparticles with semispherical (∼6.5 nm)-and rod-like (∼96 nm) shapes when the calcination temperatures were 400 and 700 °C, respectively. Photoluminescence characterizations revealed several defects types in the samples with V Zn and V O + being in the selfassembly of semispherical-and rod-like ZnO nanoparticles. The photocatalytic activity of the ZnO nanoparticles was examined by assessing the degradation of methylene blue in an aqueous solution under low-intensity visible-light irradiation (∼3 W m −2 ). The results point toward the self-assembly of semispherical-and rod-like ZnO nanoparticles that had significantly better photocatalytic activity (∼31%) in comparison to that of spherical-agglomerated-or near-spherical-like species within 120 min of irradiation. The possible photocatalytic mechanism is discussed in detail, and the morphology-driven intrinsic [V Zn +V O + ] defects are proposed to be among the active sites of the ZnO nanoparticles enhancing the photocatalytic activity.

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Section: Experimental Sectionmentioning

confidence: 99%

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [V_Zn+V_O⁺] Defects in Self-Assembled ZnO Nanoparticles

et al. 2021

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“…A perfect crystal is one in which all atoms are in their ideal position and has no imperfections. According to Williamson-Hall, crystal is imperfect due to the size of the finite crystal and their corresponding lattice strain(ε) [33]. Williamson-Hall plot equation to estimate the crystallite size and lattice strain of the samples is as follow [34]:…”

Section: Williamson-hall Methodsmentioning

confidence: 99%

Heat Transfer and Exergy Analysis of a Shell and Tube Heat Exchanger using PGW based ZnO Nanofluids

Das

Hossain

Ahamed

et al. 2022

Int. J. Automot. Mech. Eng.

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In this experimental work, ZnO nanoparticles were synthesized using the chemical precipitation method, and the nanoparticle structure and morphology were characterized through XRD and SEM. Heat transfer and exergetic characteristics were then studied in a shell and tube heat exchanger using PGW-based ZnO nanofluids varying nanoparticle volume concentration and nanofluid (shell side) flow rate at 6, 8, 10 and 12 litres/min. The hot water flow rate was fixed at 12 litres/min. The experimental results show that the heat transfer rate was improved by increasing the nanoparticle concentration and nanofluid flow rate. When the nanoparticle volume concentration was 0.3 per cent, the maximum enhancement of heat transfer rate and average heat transfer coefficient using ZnO nanofluids were 35.9 per cent and 40.2 per cent, respectively, in comparison to the base fluid. Exergy loss and dimensionless exergy loss both increased with nanofluid flow rate and dropped substantially with increased nanoparticle volume concentrations. The average increment of exergetic effectiveness at three different nanoparticle volume concentration (0.1%, 0.2%, and 0.3%) are 10.68%, 23.64%, and 31.23% respectively. The highest exergetic sustainability index (0.41) and lowest environmental impact factor (2.42) were observed when the nanoparticle concentration was 0.3% with the nanofluid flow rate of 6 litres/min.

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“…The presence of silver in the core exhibits desirable antimicrobial activities and titanium dioxide (TiO 2 ) reduces the toxicity of silver with prevention of oxidation. [42] Stabilization of Co-Pt nanocatalyst using click dendrimers render the remarkable synergy that can be utilized in various catalytic reactions like efficient hydrolysis of ammonia borane for evolution of hydrogen. [43] Miller et al studied the production and characterization of four dendrimer complexes-silver-dendrimers (internalized silver moieties with nitrogen groups), silver-dendrimers with carboxylated terminal (surface capped with silver-carboxylate groups), mixed type nanocomposite silver dendrimers (silver ions hosted in interior and exterior-owing to high metal ion loading capacity), and gold-silver metal alloy dendrimers (visible spectrum of silver dendrimers, gold dendrimers, and alloy dendrimers at around 420, 465, and 450 nm respectively).…”

Section: Metal Alloysmentioning

confidence: 99%

“…injection of cisplatin or cisplatin‐dendrimers the platinum levels in body are observed as 1 and 15 mg kg −1 respectively within maximum tolerated dose of compound indicating targeted site specific accumulation of cisplatin dendrimer nanoparticles at tumor site by enhanced permeation and retention effect. [ 42 ]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Integration of Hybrid Dendrimers and Their Generations for Modulated Spatio‐Temporal Action

Kharangate

Shende

2023

Part & Part Syst Charact

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Hybrid dendrimers constitute a unique class of well-defined complex architecture featured with a central domain and bifurcated branches with two different dendritic sequences for their atomic configuration and functional groups at the periphery. This review article pioneers the field of new hybrid dendrimers using different generations by nanoconjugation with metals, carbohydrates, nucleotides, proteins/peptides, carbosilane, urea, silica, stem cells, guanidine, etc. The smart dendrimers contain desirable electrical, magnetic, optical, and biological attributes to increase surface area, monodisperse behavior, dose reduction, dissolution, permeability, longterm stability, and significant decrement in nanotoxicity studies. The higher encapsulation of lipid soluble and insoluble moieties explores an excellent platform for the delivery of drugs (ibuprofen, indomethacin, etc.), nucleic acids (oligonucleotide, siRNA, and aptamer), genetic materials , and chemical diagnostic agents (gadolinium chelates and superparamagnetic iron oxide particles) for imaging. Owing to their flexibility in structural adaptability, different health conditions like glaucoma, inflammation, microbial infection, neurodegenerative problems (Alzheimer's disease and Parkinsonism), and cancer are benefited using such long-lasting drug delivery. Advancements in molecular engineering techniques, 3D printing, artificial intelligence, robotic, green synthesis, and microwave-assisted methods aid in the development of economically reliable and personalized pharmaceutical hybrid dendritic systems resembling antibodies, globular proteins, stem cells, enzymes, and genetic materials.

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Investigations on structural and optical properties of chalcone dendrimer in Ag@TiO2 core–shell nanoparticles

Cited by 12 publications

References 27 publications

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [V_Zn+V_O⁺] Defects in Self-Assembled ZnO Nanoparticles

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [V_Zn+V_O⁺] Defects in Self-Assembled ZnO Nanoparticles

Heat Transfer and Exergy Analysis of a Shell and Tube Heat Exchanger using PGW based ZnO Nanofluids

Integration of Hybrid Dendrimers and Their Generations for Modulated Spatio‐Temporal Action

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Investigations on structural and optical properties of chalcone dendrimer in Ag@TiO2 core–shell nanoparticles

Cited by 12 publications

References 27 publications

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [VZn+VO+] Defects in Self-Assembled ZnO Nanoparticles

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [VZn+VO+] Defects in Self-Assembled ZnO Nanoparticles

Heat Transfer and Exergy Analysis of a Shell and Tube Heat Exchanger using PGW based ZnO Nanofluids

Integration of Hybrid Dendrimers and Their Generations for Modulated Spatio‐Temporal Action

Contact Info

Product

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Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [V_Zn+V_O⁺] Defects in Self-Assembled ZnO Nanoparticles

Visible-Light-Responsive Photocatalytic Activity Significantly Enhanced by Active [V_Zn+V_O⁺] Defects in Self-Assembled ZnO Nanoparticles