Ultrasound Assisted Sonochemical Synthesis of ZrO2: Eu3+ Nanophosphor

Eu3+ ions doped (1 – 7 mol %) ZrO2 nanoparticles (NPs) were synthesized by a facile green synthesis method using Alove vera as fuel. The obtained ZrO2: Eu3+ (1-7 mol %) NPs were characterized by using powder X-ray diffraction studies (PXRD); Raman studies and photoluminescence (PL) techniques. The dependency of dopant concentration on the crystal structure and luminescence properties were discussed in detail. The PL emission of ZrO2: Eu3+ NPs shows characteristics transitions of Eu3+ ions. The CIE chromaticity and CCT confirms the phosphor material as red emitting hence it was quite useful in display applications

Ultrasound Assisted Sonochemical Synthesis of ZrO2: Eu3+ Nanophosphor

Eu3+ ions doped (1 – 7 mol %) ZrO2 nanoparticles (NPs) were synthesized by a facile green synthesis method using Alove vera as fuel. The obtained ZrO2: Eu3+ (1-7 mol %) NPs were characterized by using powder X-ray diffraction studies (PXRD); Raman studies and photoluminescence (PL) techniques. The dependency of dopant concentration on the crystal structure and luminescence properties were discussed in detail. The PL emission of ZrO2: Eu3+ NPs shows characteristics transitions of Eu3+ ions. The CIE chromaticity and CCT confirms the phosphor material as red emitting hence it was quite useful in display application

Synthesis, characterization of zro₂:Tb³⁺ (1-9 mol %) nanophosphors for blue lighting applications and antibacterial property

This paper reports the structural, morphological, and antibacterial studies of ZrO2:Tb3+ nanophosphors (NPs). The ZrO2:Tb3+ NPs were synthesized by hydrothermal route using Amylamine as surfactant. ZrO2:Tb3+ nanophosphors was characterized by Powder X-ray Diffraction(PXRD), Scanning Electron Microscope (SEM),Diffuse reflectance spectroscopy (DRS), Photoluminescence(PL), Raman spectra, Fourier Transform Infrared radiation(FTIR) and Transmission Electron Microscope(TEM). PXRD analysis shows better crystallinity, cubic in-phase and good homogeneity of the synthesized phosphors were confirmed. When the Tb3+ concentration varies, we obtain blue emissions from ZrO2:Tb3+ NPs. ZrO2:Tb3+ NPs have a promising approach to blue light sources in the display application. SEM images show that ZrO2:Tb3+ nanophosphors have good morphology with a nonporous structure. TEM and SAED pattern confirms that ZrO2:Tb3+ nanophosphors are crystalline in nature. ZrO2:Tb3+ (9mol %) nanophosphors possessed a good antibacterial ability. © 2021 by the authors

Green Synthesis, Characterization and Antibacterial Activity of CuO Nano Particle

A green low temperature combustion route is proposed for the synthesis of CuO nanoparticles, using Copper nitrate powder and Nigella sativa (Kalonji) seed extract as the starting materials. The formation of CuO Nps was characterized by PXRD, SEM, UV-Visible etc. The PXRD Pattern reveals that as-synthesized CuO Nps of monoclinic phase and Crystallite structure. The scanning electron microscopy (SEM) images reveal the morphology of the nanoparticles are spherical in shape. CuO Nps show significant antibacterial activity against both gram +ve and Gram-ve bacterial strains using agar well diffusion method. The present method brings out a promising green, simple, low cost and low temperature way to prepare multifunctional CuO nanomaterials

Bio-inspired ultrasonochemical synthesis of blooming flower like ZnO hierarchical architectures and their excellent biostatic performance

Novel three dimensional (3D) ZnO hierarchical architectures were fabricated by a bio-inspired ultrasound assisted sonochemical route using self-sacrificial Aloe Vera (A.V.) gel as a bio-surfactant. The emergence of 3D superstructures (SS) is of essential interest, and the ability to program their form has practical ramifications in fields such as optics, biological activity, and catalysis and creates a bouquet of assembled SS with unprecedented levels of complexity and precision. These results outline a nanotechnology strategy for “collaborating” with self-assembly processes in real time to build SS architecture. The structural analysis exhibits that the ZnO SS were high purity without any secondary phases. Photoluminescence (PL) studies indicate that the zinc vacancies (V2n) and singly ionized oxygen vacancies (Vo+) located on the surface of ZnO. Further, we report a ‘smart’ bio-static ZnO SS, which might prevent build-up of active antimicrobial material in the environment. Precisely localized control of activity is achieved, allowing the growth of bacteria to be confined to defined patterns, which has potential for the development of treatments that avoid interference with the endogenous microbial population in other parts of the organism

Facile LaOF: Sm3+ based labeling agent and their applications in residue chemistry of latent fingerprint and cheiloscopy under UV–visible light

Luminescent lanthanum oxyfluoride nano inorganic materials were considered to be prospective building blocks for multifunctional applications. This offers new potentials in surface-based science comprising of visualization of latent fingerprint (LFPs) and lips print on non-porous surfaces. Traditional visualization techniques possess high backward hindrance, low sensitivity, complicated setup and poor visibility. To overcome with these problems, LaOF:Sm3+ (5 mol%) nanopowder (NPs) prepared via sonochemical route were explored. Photoluminescence (PL) emission spectra exhibit strong emission peaks at ∼566 nm, 607 nm, 653 nm and 708 nm attributed to 4G5/2 → 6H5/2, 4G5/2 → 4H7/2, 4G5/2 → 6H9/2 and 4G5/2 → 6H11/2 intra-4f orbital transitions of Sm3+ ions respectively. Estimated photometric properties confirm that the material emits warm orange red color. Therefore, the synthesized phosphor materials may quite be useful for LFPs recovery, cheiloscopy and optoelectronics applications. Keywords: Ultrasonication, Photoluminescence, Forensic, Cheiloscopy, Solid state lightin

Broad spectral inhibitory effects of pale green zinc oxide nanophosphor on bacterial and fungal pathogens

Nd3+ doped zinc oxide nanophosphor were prepared by a modified sonochemical route. Adsorption of Aloe vera (A.V.) gel by the precursors made the final product with controlled morphology, that is A.V. gel acted as surfactant. Characterization studies confirmed the pure hexagonal phase with nanostructure, wide-bandgap was reported. Major electronic transitions in the prepared samples were due to 4f shell electrons of Nd3+ions. Emission peaks attributed to 2P3/2 → 4I13/2, 2P3/2 → 4I15/2, 1I6 → 3H4, 2P1/2 → 4I9/2 and 4G7/2 → 4I9/2 transitions under the excitation wavelength of 421 nm. The emitted wavelengths showed the redshift from blue to pale green region. Further, the prepared samples showed very good control over the growth of microbial pathogens such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumonia, Pseudomonas aeruginosa, Alternaria alternata and Fusarium oxysporum. The proposed mechanism is that the ZnO:Nd3+ interwinds the bacteria and fungal pores with a heterogeneous range of superstructues, resulting in the local perturbation at cell membrane of fungal cells. This induces to decrease the potential energy at bacterial membrane and the leakage of electrolytes of fungal spores. There is a mechanical wrapping interaction between pathogens and the nanoparticles which locally damages of the cell membrane and causes cell lysis. Biocompatible, ZnO:Nd3+ nanostructures possesses antibacterial activity against more multi-resistant bacterial and fungal phytopathogens. This additional information provides useful scientific information to prevent the various crop diseases

3D ultrastructural analysis of α‐granule, dense granule, mitochondria, and canalicular system arrangement in resting human platelets

Abstract Background State‐of‐the‐art 3‐dimensional (3D) electron microscopy approaches provide a new standard for the visualization of human platelet ultrastructure. Application of these approaches to platelets rapidly fixed prior to purification to minimize activation should provide new insights into resting platelet ultrastructure. Objectives Our goal was to determine the 3D organization of α‐granules, dense granules, mitochondria, and canalicular system in resting human platelets and map their spatial relationships. Methods We used serial block face–scanning electron microscopy images to render the 3D ultrastructure of α‐granules, dense granules, mitochondria, canalicular system, and plasma membrane for 30 human platelets, 10 each from 3 donors. α‐Granule compositional data were assessed by sequential, serial section cryo‐immunogold electron microscopy and by immunofluorescence (structured illumination microscopy). Results and Conclusions α‐Granule number correlated linearly with platelet size, while dense granule and mitochondria number had little correlation with platelet size. For all subcellular compartments, individual organelle parameters varied considerably and organelle volume fraction had little correlation with platelet size. Three‐dimensional data from 30 platelets indicated only limited spatial intermixing of the different organelle classes. Interestingly, almost 70% of α‐granules came within ≤35 nm of each other, a distance associated in other cell systems with protein‐mediated contact sites. Size and shape analysis of the 1488 α‐granules analyzed revealed no more variation than that expected for a Gaussian distribution. Protein distribution data indicated that all α‐granules likely contained the same major set of proteins, albeit at varying amounts and varying distribution within the granule matrix