Abstract:Oleic
acid-coated cobalt ferrite nanoparticles were synthesized
using the chemical co-precipitation route and characterized by standard
techniques for structure, morphology, and magnetic properties analysis.
The Rietveld refined X-ray diffraction (XRD) pattern of CoFe
2
O
4
nanoparticles indicated the formation of a cubic-spinel
single-phase structure with the F
d
3̅
m
space group. The average crystallite size (∼12
nm) … Show more
“…The non-existence of peaks corresponding to 27.5° and 30.8° have shown the absence of rutile and brookite phases 29 . Recording of noise level in the XRD diffractogram might be due to template particles on catalyst’s surface 12 . Figure 2 XRD patterns of ( a ) NT ( b ) NT1 ( c ) NT2, ( d ) NT3.…”
Section: Resultsmentioning
confidence: 99%
“…The advantages and disadvantages of homogeneous as well as heterogeneous catalysis paves a basic necessity of a new system, which ought to be vibrant as homogeneous catalysis, also efficiently regainable as heterogeneous catalysis 11 . Studies have been focused to overcome this limitation by tuning their crystallite, surface and optical characteristics via novel alternatives like making use of chemical and bio material templates, metal/non-metal doping and blending of different light absorbing materials 12 . Doping of metals like Ag, Ni, Co, Au, Cu, V, Fe, Mg 13 were already reported by scientists on tailoring the electronic, surface, thermal and crystalline nature and non-metals like C 14 , N 15 , F 16 , S 17 for causing red shift thereby enabling visible light active photo catalytic degradation of organic pollutants.…”
In order to deal with the arising environmental issues across the globe at present nano particles with unique properties laid a benchmark in the name of nano catalysis. In this work the significance of calcination temperature on the thermal, electronic, structural and surface properties of a nano catalyst produced by sol–gel method using ultrasonic radiation against the disposal of toxic textile pollutants is studied in detail. The extract of tea leaves has been used as a bio-template during the synthesis to revise the crystallite size, surface area, optical absorption potential, and rate of agglomeration of nano sized grains by regulating their physico-chemical and surface properties. The influence of calcination in the transformation of single phased anatase titania to mixed phase anatase–rutile titania and the corresponding outcome in its photocatalytic activity employed in water treatment applications have been verified. The nano catalyst obtained is characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transition electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Thermo gravimetric analysis (TGA), Brunaueur Emmett Teller (BET) analysis, UV–Vis diffused reflectance spectroscopy (DRS-UV–Vis) etc. The mesoporosity of the particle was examined using Barrett Joyner Halenda (BJH) model. The enhanced photo catalytic efficiency (about 97.7%) of templated nano titania due to calcination is verified against Congo red, a textile dye under optimized conditions. The nano catalyst produced can be easily separated, recycled to support its economic feasibility.
“…The non-existence of peaks corresponding to 27.5° and 30.8° have shown the absence of rutile and brookite phases 29 . Recording of noise level in the XRD diffractogram might be due to template particles on catalyst’s surface 12 . Figure 2 XRD patterns of ( a ) NT ( b ) NT1 ( c ) NT2, ( d ) NT3.…”
Section: Resultsmentioning
confidence: 99%
“…The advantages and disadvantages of homogeneous as well as heterogeneous catalysis paves a basic necessity of a new system, which ought to be vibrant as homogeneous catalysis, also efficiently regainable as heterogeneous catalysis 11 . Studies have been focused to overcome this limitation by tuning their crystallite, surface and optical characteristics via novel alternatives like making use of chemical and bio material templates, metal/non-metal doping and blending of different light absorbing materials 12 . Doping of metals like Ag, Ni, Co, Au, Cu, V, Fe, Mg 13 were already reported by scientists on tailoring the electronic, surface, thermal and crystalline nature and non-metals like C 14 , N 15 , F 16 , S 17 for causing red shift thereby enabling visible light active photo catalytic degradation of organic pollutants.…”
In order to deal with the arising environmental issues across the globe at present nano particles with unique properties laid a benchmark in the name of nano catalysis. In this work the significance of calcination temperature on the thermal, electronic, structural and surface properties of a nano catalyst produced by sol–gel method using ultrasonic radiation against the disposal of toxic textile pollutants is studied in detail. The extract of tea leaves has been used as a bio-template during the synthesis to revise the crystallite size, surface area, optical absorption potential, and rate of agglomeration of nano sized grains by regulating their physico-chemical and surface properties. The influence of calcination in the transformation of single phased anatase titania to mixed phase anatase–rutile titania and the corresponding outcome in its photocatalytic activity employed in water treatment applications have been verified. The nano catalyst obtained is characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transition electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Thermo gravimetric analysis (TGA), Brunaueur Emmett Teller (BET) analysis, UV–Vis diffused reflectance spectroscopy (DRS-UV–Vis) etc. The mesoporosity of the particle was examined using Barrett Joyner Halenda (BJH) model. The enhanced photo catalytic efficiency (about 97.7%) of templated nano titania due to calcination is verified against Congo red, a textile dye under optimized conditions. The nano catalyst produced can be easily separated, recycled to support its economic feasibility.
“…In most cases, absorber materials possess low permeability and high permittivity, while magnetic spinel ferrites have the competency of good impedance matching according to their higher permeability over other absorbers. Spinel ferrites (MFe 2 O 4 , M = Co, Ni, Mn, Zn, Fe, Cu) as soft magnetic materials can be used for diverse applications such as home and industrial electronic devices 19 , 20 , biomedicals 21 – 23 , catalysts 24 , 25 , and further in EMI shielding as absorber materials because of their relatively high dielectric/magnetic loss, excellent chemical stability, and low costs 26 , 27 . Nickel–Zinc ferrite shows better EM wave absorption performances compared to other spinel ferrites due to higher resistivity, high saturation magnetization, and high permeability 28 – 30 .…”
Nickel–zinc ferrite (Ni0.5Zn0.5Fe2O4) powders were prepared by the conventional solid-state route and sintered at 1100 and 1300 °C for utilization as a tile electromagnetic wave absorber. Structural, magnetic, and microwave absorption properties were investigated by characterization techniques of X-ray diffraction, thermogravimetric analysis, Raman spectroscopy, electron microscopy, vibrating sample magnetometry, and vector network analyzer. The samples sintered at 1300 °C showed high magnetic saturation of 87 emu/g and low coercivity of 4 Oe. Electromagnetic investigations exhibit high reflection losses up to − 48.1 dB at certain high and low gigahertz frequencies, as clearly depicted in the 3D contour plot. The optimized condition between reflection loss, thickness, and bandwidth revealed a reflection loss of about − 36.1 dB at the matching thickness of 3.7 mm for the X-band. Furthermore, the effective working bandwidth at − 10 dB was up to ~ 7.1 GHz for the minimum thickness of 4.3 mm, which thoroughly covered the C-band. The microwave absorption performance of the well-sintered Ni–Zn ferrite was attributed to the incorporation of dielectric and magnetic loss mechanisms in which the magnetic part prevails.
“…In the last decade, synthetic magnetic nanoparticles (MNPs) have been developed for various applications. [ 21–26 ] Solid‐phase reversible immobilization (SPRI) of nucleic acid on MNPs offers a simple and elegant alternative to centrifuge‐ or column‐based methods. [ 27 ] Under dehydrating conditions the MNPs are able to reversibly bind to nucleic acids (e.g., RNA) present in the sample.…”
Molecular diagnosis and surveillance of pathogens such as SARS‐CoV‐2 depend on nucleic acid isolation. Pandemics at the scale of COVID‐19 can cause a global shortage of proprietary commercial reagents and BSL‐2 laboratories to safely perform testing. Therefore, alternative solutions are urgently needed to address these challenges. An open‐source method, magnetic‐nanoparticle‐aided viral RNA isolation from contagious samples (MAVRICS), built upon readily available reagents, and easily assembled in any basically equipped laboratory, is thus developed. The performance of MAVRICS is evaluated using validated pathogen detection assays and real‐world and contrived samples. Unlike conventional methods, MAVRICS works directly in samples inactivated in phenol‐chloroform (e.g., TRIzol), thus allowing infectious samples to be handled safely without biocontainment facilities. MAVRICS allows wastewater biomass immobilized on membranes to be directly inactivated and lysed in TRIzol followed by RNA extraction by magnetic nanoparticles, thereby greatly reducing biohazard risk and simplifying processing procedures. Using 39 COVID‐19 patient samples and two wastewater samples, it is shown that MAVRICS rivals commercial kits in detection of SARS‐CoV‐2, influenza viruses, and respiratory syncytial virus. Therefore, MAVRICS is safe, fast, and scalable. It is field‐deployable with minimal equipment requirements and could become an enabling technology for widespread testing and wastewater monitoring of diverse pathogens.
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