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

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. </jats:p

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

Synthesis, Characterization and Photoluminescence Properties of CdSiO&lt;sub&gt;3&lt;/sub&gt;:Ce&lt;sup&gt;3+&lt;/sup&gt; Nanophosphors

CdSiO3: Ce3+ (1-11mol %) nanophosphors were prepared by low temperature solution combustion method using Oxalyl di-hydrazine (ODH) as fuel. The final products were well characterized by PXRD and SEM. The optical properties of the nanophosphors were investigated by Photoluminescence studies. PXRD results evident that CdSiO3 phosphor shows pure single monoclinic structure. The average crystallite size was calculated using Debye – Scherer’s formula and was found to be in the range of 30-40 nm. The SEM micrographs show phosphors with high porosity and irregular shaped particles. Photoluminescence peaks observed at 454, 563 and 679 nm under 397 nm excitation was due to transition from 5d state to the 2F5/2 and 2F7/2 components of the ground state of Ce3+ in CdSiO3 host material. CdSiO3:Ce3+ nanophosphors show an intense yellow emission with CIE coordinates (0.47, 0.50) with average correlated color temperature value 3284 was within the range of vertical day light. The present study successfully demonstrates solution combustion synthesis of nanophosphors for display applications.</jats:p

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

Alpha-Granules in Resting Human Platelets Are a Spatially Clustered, Single Major Population

Abstract We interrogated in 3D-space the arrangement of alpha-granules and their proteins within 30 human platelets in order to address two central structure/function questions. First, are alpha-granules based on their size, shape and protein content a single population or not, and second, what implications could organelle frequency and organization within the resting platelet have for platelet biogenesis and membrane fusion events in activated platelets? We used serial block face scanning electron microscopy (SBF-SEM) to render in full platelet volume the ultrastructure of alpha-granules, dense granules, mitochondria, canalicular system (CS), and plasma membrane (PM) in 30 platelets, 10 each from 3 donors. Size and shape were measured for 1488 a-granules. Compositional data were assessed for multiple proteins over hundreds of granules by 3D-structured illumination microscopy (SIM) and serial section cryo-immunogold electron microscopy. Data analysis led to 3 conclusions: 1) Based on size, shape and protein composition, there was one major population of alpha-granules in resting human platelets, 2) Alpha-granules clustered tightly together while dense granules were more peripherally located and distal from one another suggesting a spatial arrangement that in the one case supports compound granule fusion and in the other case rapid fusion with the PM, and 3) Based on the weak relationship between platelet size and organelle number and volume, we inferred that platelet biogenesis is likely relatively imprecise with alpha-granule inclusion being more precisely metered than that of other organelles,. These results provide a strong, informative baseline for a-granule structural properties and suggest a spatial clustering of organelles within the resting platelet that may be functionally significant during platelet activation. Figure. Figure. Disclosures No relevant conflicts of interest to declare. </jats:sec

Flexible droplet microfluidic devices for tuneable droplet generation

Droplet microfluidics is a promising technology for applications that require precise handling of minute fluid volumes. This technology has broad applications in the pharmaceutical industry, food and beverage, and material synthesis. Droplet size and frequency are the two key parameters in these applications. Current droplet microfluidic devices are rigid platforms where the geometry and dimensions of microchannels are fixed after the device fabrication. This poses a significant limitation when adjusting the droplet generation characteristics. Repetitive design, fabrication, and testing are often needed to achieve the optimal microchannel dimensions. To overcome this bottleneck, we develop a proof-of-concept stretchable microfluidic device that can control droplet size and generation frequency by precisely controlling the microchannel dimensions in real-time. Theoretical analysis, numerical modelling, and experimental characterisation were conducted to study the influence of device lateral stretching on these characteristics. We found that the lateral stretching of the device increased the droplet diameter and spacing but reduced the droplet generation frequency. Droplet diameter and spacing increased by ∼20 %, and droplet frequency decreased by ∼45 % when the device was strained up to 25 %. We believe this innovative, flexible droplet microfluidic platform will provide an alternative way to precisely control the droplet formation by modifying the channel dimensions on-site and in real-time.Full Tex

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