Alkaline earth-based double perovskite composites are novel perovskite compounds that have been the recent topic of interest for many material physicists. Since not much work has been reported in ...this particular field of study; hence, we took up the task of analyzing the multifunctional and multiferroic properties of Mg
2
(Fe
0.85
Ni
0.15
)NbO
6
. The frequency-dependent dielectric, impedance, and tangent loss characterizations were performed to infer the capacitive and semiconducting properties of the sample. The magnetic study revealed the weak ferromagnetic characteristics of the composite, particularly induced by structural distortions. The nonzero P−E hysteresis loop at room temperature indicates the ferroelectric polarizations present in the compound. The optical band gap was estimated by extrapolating the Tauc plot of ultraviolet−visible spectroscopy covering the UV to the visible range of the electromagnetic spectra. The conductivity analysis was performed following the frequency-dependent ac conductivity which showed very good high-frequency ac conductivity of the ceramic.
The multi-functional material Li
2
LaFeTiO
6
belonging to double perovskite family is expected to be non-cubic structure and interaction between La and Fe introduce octahedral B-site cation dis-order ...or anti-site effect. The material is prepared by conventional solid state reaction technique and its formation has been checked through X-ray diffraction (XRD). It is observed that material is orthorhombic crystal structure with Pbnm space group. Scanning electron microscope (SEM) picture of the surface uncovers distinctive shape and sizes of the grains are consistently appropriated all through the surface leaving not many voids. Energy dispersive spectroscopy (EDX) study indicates there is no impurities are seen in the present material. Fourier transform infrared (FTIR) spectroscopy revels the perovskite phase and different modes of vibration. The room temperature UV–Visible spectroscopic analysis reveals material is a potential candidate photovoltaic/solar cell device. The dielectric and electrical measurement is carried out using computer control LCR analyzer. The room temperature dielectric constant and loss tangent of the material is respectively > 400 and < 0.1 which reflects it can be used for multi-layer capacitor and micro-electronics.
Nowadays, kidney dysfunction is a common health issue due to the modernized lifestyle. Even though medications are commercially available to treat kidney diseases, early diagnosis is crucial and ...challenging. Clinically, measuring urine creatinine and pH has gained significant interest as a way to diagnose kidney diseases early. In the present work, we attempted to develop a low-cost, robust, accurate and naked-eye colorimetric method to determine both creatinine levels and pH variations in artificial urine samples using a simple 3D-printed hybrid microfluidic device. Creatinine was detected by the incorporation of the traditional Jaffe test onto the hybrid paper-PMMA microfluidic device and pH (4-8) was measured by a simple anthocyanin test. Notably, the tests were established without employing any sophisticated or costly instrument clusters. The developed 3D-printed microfluidic probe showed a limit of detection (LOD) of 0.04 mM for creatinine over a concentration range of 1-10 mM, with a regression coefficient (
R
2
) of 0.995 in laboratory conditions. Interestingly, the experimental data obtained with artificial urine exhibited a wide linear range from 0.1 mM to 5 mM under different pH values ranging from 4 to 8 in the presence of matrices commonly found in urine samples other than proteins, indicating the potential use of this method in pre-clinical analysis. Since the wide linear range of urine creatinine in artificial urine samples falls well below the clinically relevant concentrations in humans (0.07-0.27 mM), the developed lab-on-chip device is further suitable for clinical evaluation with proper ethical clearance. This 3D-printed hybrid microfluidic colorimetry-based creatinine detection and pH indicator platform can be beneficial in the healthcare sector due to the on-site testing capability, cost-effectiveness, ease of use, robustness, and instrument-free approach.
A 3D-printed microfluidic device for monitoring creatinine and pH, possibility for future clinical testing established through artifical urine analysis.
The materials having multifunctional behavior are in the form of single crystal or poly crystalline. The present reports belong to polycrystalline samples of lead reducing double perovskite vanadates ...of Pb2-xSrxBiVO6 (0.5 ≤ x ≤ 1.5) oxide ceramics. To synthesize the present samples cost effective solid solution casting technique has been adopted. Their formation, density, phase identification as well as purity were verified through X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Fourier transmission Infra-red (FTIR) and RAMAN spectroscopy. The optical properties of the materials have been investigated by utilizing room temperature UV–Vis and photo luminescence (PL) spectroscopic analysis. It is observed the band gap of the materials were found to be in the range of 2.68–2.23eV from UV–Vis study which suggest materials can be useful for photo catalytic devices whereas PL emission spectra confirms they are may be useful as blue white LED devices. Presence of ferroelectricity in the materials was confirmed from dielectric as well as polarization study which allows their utility for multi-layer capacitor and memory devices. Transport and leakage characteristics of the materials were studied from loss tangent, impedance spectroscopy as well as modulus spectroscopy recorded at different conditions of frequency and temperature which may be useful for microelectronics.
•The material is ‘Sr’ doped lead reducing double perovskite prepared by inexpensive solid solution casting method.•Structural and micro structural study reveals single phase, high symmetry and highly dense compound.•Dielectric and polarization study infers it can be useful for multilayer capacitor and memory devices.•Optical properties of the material reflect it can be useful for photovoltaic/solar cell and blue white LED devices.
The lifespan and the performance of flexible electronic devices and components are affected by the large accumulation of heat, and this problem must be addressed by thermally conductive polymer ...composite films. Therefore, the need for the development of high thermal conductivity nanocomposites has a strong role in various applications. In this article, the effect of different particle reinforcements such as single and hybrid form, coated and uncoated particles, and chemically treated particles on the thermal conductivity of various polymers are reviewed and the mechanism behind the improvement of the required properties are discussed. Furthermore, the role of manufacturing processes such as injection molding, compression molding, and 3D printing techniques in the production of high thermal conductivity polymer composites is detailed. Finally, the potential for future research is discussed, which can help researchers to work on the thermal properties enhancement for polymeric materials.
A comparative study on the thermal conductivity of conventionally made and 3D‐printed polymer composites is reported. The role of the 3D printing process in manufacturing high thermal conductivity polymer composites is reported. Various techniques used to manufacture high thermal conductivity polymer composites are thoroughly discussed.
Embracing mixed oxide state response course, lead-free polycrystalline 0.075(K
0.5
Bi
0.5
TiO
3
)–0.925 (NaNbO
3
) or 0.075 (KBT)–0.925 (NN) ceramic integrate, and its optical, auxiliary, dielectric, ...ferroelectric, and impedance properties are investigated. Basic examination represents the arrangement of new perovskite, with an orthorhombic structure having space bunch as Pmc21. FESEM micrograph proves the closeness of homogeneous nature in morphology. FTIR analysis suggests that there is a change in the vibrational mode of phonons due to the inclusion of NN with KBT. The optical band gap of the material is 3.06 eV as obtained from the diffuse absorbance spectra which is suitable for the photo-catalytic application. From Raman spectra, it is seen quite different vibrational modes from 130 to 900 cm
−1
. Polarization study affirms the ferroelectric idea of the present investigation. Dielectric and complex impedance investigations are carried out in the frequency range of 10
2
–10
6
Hz and temperature range of 30–500 °C. AC conductivity range is represented by Jonscher’s power law. AC conductivity reveals the semiconducting nature of the material.
•Klebsiella pneumoniae is an emerging pathogen of humans and animals.•A thermotolerant lytic bacteriophage was isolated and characterised in vitro as a phage therapy candidate.•Protein constituents ...of the lytic phage were analysed by SDS-PAGE and nLC-MS/MS.•Therapeutic efficacy was observed at 2 h post-challenge with virulent K. pneumoniae in a BALB/c mouse model.
Klebsiella pneumoniae is an important emerging pathogen of humans and animals leading to serious clinical consequences. Increased antibiotic use has promoted the emergence of carbapenem-resistant and extended-spectrum β-lactamase (ESBL)-producing K. pneumoniae strains. Recently, phage therapy has gained momentum as a possible alternative against emerging antimicrobial resistance. This study was performed to assess the therapeutic effects of a novel lytic phage (VTCCBPA43) in a pneumonic mouse model in order to explore the efficacy of phage therapy against virulent K. pneumoniae infection.
The tailed phage VTCCBPA43 was assessed for its growth kinetics, in vitro host range, and temperature and pH sensitivity. Protein constituents were analysed by SDS-PAGE and nLC-MS/MS. Therapeutic efficacy was observed 2 h post-challenge with virulent K. pneumoniae in a BALB/c mouse model.
Phage VTCCBPA43 was found to be highly temperature-tolerant (up to 80 °C). It was most active at pH 5, had a burst size of 172 PFU/mL and exhibited a narrow host range. It was identified as a KP36-like phage by shotgun proteomics. Following intranasal application of a single dose (2 × 109 PFU/mouse) post-challenge with virulent K. pneumoniae, the presence of biologically active phage in vivo and a significant reduction in the lung bacterial load at all time points was observed. A reduction in lesion severity suggested overall beneficial effects of VTCCBPA43 phage therapy in the pneumonic mouse model.
This research represents the first in vivo evidence of effective phage therapy against K. pneumoniae infection by the intranasal route.
This paper describes the adsorption behavior of ruthenium on multi walled carbon nanotubes (MWCNTs) from aqueous solution. The adsorption behavior of ruthenium on MWCNTs was studied with respect to ...contact time, pH, concentration of metal ion, adsorbent dosages and temperature. The equilibrium adsorption data were fitted to Pseudo first order, Pseudo second order, Elovich and Intra-particle diffusion kinetic model as well as Langmuir, Freundlich, Dubinin–Radushkevich and Temkin isotherm models. The Langmuir adsorption isotherm model was found to be best fitted in terms of standard deviation and regression coefficient. The thermodynamics parameter such as Δ
H
°, Δ
S
°, Δ
G
° were also calculated. The endothermic nature of adsorption is indicated by positive value of Δ
H
° and Δ
S
° resulting the randomness at solid solution interface towards favorable adsorption.
In this report, we have investigated the structure, vibration, optical, dielectric, transport and magnetic features of the double perovskite Sr2FeVO6. The structural investigation of the sample is ...done by incorporating X-ray diffraction (XRD) and scanning electron microscopic (SEM) technique at room temperature. The structural investigation suggests the formation of a single phase polycrystalline sample having monoclinic symmetry. The chemical composition and valence of the involved elements are investigated by incorporating the X-ray photoelectron spectroscopic (XPS) technique. The dual oxidation state of Fe is revealed through the XPS investigation. The vibrational property of the sample is analyzed through both Raman and FTIR spectroscopic methods. The various modes of vibrations such as symmetric, anti-symmetric and bending modes are illustrated through Raman and FTIR techniques. Analysis of optical spectrum and energy bandgap of the sample is done by UV–Visible spectroscopic technique. The bandgap (Eg = 2.88 eV) of the material is found suitable for photocatalytic activities. The dielectric spectrum of the sample is analyzed by investigating the variation of dielectric parameters, that is εr and tanδ, w.r.t frequency-temperature. The dielectric spectrum is found consistent with Maxwell-Wagner model. The electrical and transport activities in the material are investigated by analyzing the spectra of impedance, modulus and AC conductivity at varying frequencies and temperatures. The relaxation feature of the material is illustrated through impedance and modulus spectroscopic techniques whereas the significant contribution of hopping conduction mechanism is depicted through AC conductivity spectra. Finally, the ferromagnetic property of the material at room temperature is clarified through the hysteresis curve.
•The double perovskite Sr2FeVO6 was synthesized by high-temperature solid state route.•The strong UV–Vis analysis suggest material can be used as photocatalytic activities.•The high dielectric constant and low loss illustrate the energy storage applications.•The magnetic investigation by M − H loop reveals the ferromagnetic feature.
A 90-day feeding experiment was conducted using flow through system to evaluate the requirement of vitamin E for rohu fry in relation to growth performance and to assess the relationship between the ...dietary vitamin E levels and carcass composition. Five semi-purified diets supplemented with 0, 50, 100, 150, 200 mg vitamin E/kg dry diet as
dl-α-tocopheryl acetate were fed to rohu fry (av. wt.±S.E.=0.58±0.01 g) in triplicate groups. At the end of the experiment, growth and dietary performance were evaluated and vitamin E deposition in the tissue, erythrocyte fragility, thiobarbituric acid reactive substances (TBARs) were analyzed. The average net weight gains were 6.82±0.09, 7.38±0.03, 8.20±0.03, 8.07±0.09 and 8.12±0.08 (g/90 days), respectively, for fish fed diets 0, 50, 100, 150, 200 mg vitamin E/kg. The fish fed diets containing less than 100 mg supplemental vitamin E/kg had significantly (
P<0.05) reduced weight gain, feed efficiency and other nutritional indices compared to those fed diets supplemented with vitamin E at 100–200 mg/kg. With the increasing level of vitamin E, both TBARs and erythrocyte fragility values were reduced. Regression analysis of weight gain data using broken-line model indicated a minimum vitamin E requirement of 131.91 mg/kg dry diet. The erythrocyte fragility and TBARs were maximum in fish fed the vitamin E-deficient diet. From the present experiment, it may be concluded that the vitamin E requirement of
Labeo rohita fry for optimum growth and other dietary performances is 131.91 mg/kg of dry diet.
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