The present study focuses on non-enzymatic glucose detection by an extended gate field-effect transistor (EGFET) based on zeolitic imidazole framework-67 (ZIF-67) derived cobalt tetraoxide (Co3O4) dodecahedron shaped microparticles. XRD has...
A Screen printed potentiometric urea biosensor is developed to monitor the blood urea level non-invasively using reverse iontophoresis (RI). The working electrode is screen printed using graphitic carbon paste, reference and RI electrodes are screen printed using silver/silver chloride (Ag/AgCl) paste. Urease enzyme is immobilized in the polypyrrole (PPy) matrix of the working electrode using optimized cyclic voltammetry parameters to obtain maximum sensor performance. Electrochemical and material characterizations conducted in the Screen Printed Reference Electrodes (SPRE) are examined to ensure their stability and retention of their properties. The developed screen printed sensors exhibited sensitivity of 35.07 mV/decade and showed liner response for the range, 10 μM to 5 mM with a correlation co-efficient of 0.995. Interference studies with KCl, NaCl and MgCl 2 solutions are performed and it was found that sensor performance is unaffected due to interference ions. The urea sensor is further validated by conducting clinical investigations on 15 human subjects. A correlation is established between blood urea level and transdermal extracted urea level and the correlation co-efficient is found to be 0.391.
Covid-19 remains a global pandemic surging with different variants like (Omicron) in various countries. An escalation in random testing for Covid-19 is considered as the golden standard by WHO to control the spread of Corona virus. RT-PCR and nucleic acid hybridization strategies are two highly sensitive outstanding tests used for the detection of SARS-CoV-2 in the DNA by the former and RNA/DNA by the later. Apart from the test for virus, antigen, and antibodies, other alternative hematological tests like CRP, Ferritine, IL-6, Blood Platelets and WBC, and plasma became essential for the detection and management of Covid-19. Overcoming the limitations of a rapid, efficient, low-cost, and easy-to-implement test kits are in imperative need to meet these requirements. Electrochemical sensors are considered as potential and ultrafast point-of-care sensors used as self-testing kits. In this work, we review the various modified electrodes with different nanomaterials such as graphene, CNTs, and nano-dopants used as electrochemical sensors in association with testing various different parameters for detection of covid-19. A detailed discussion on the merits of present testing patterns and scope of screen-printed electrochemical sensors modified with different nanomaterials and their advantages is presented.
The present work is intended to fabricate titanium diboride (TiB2) and yttrium oxide (Y2O3) fused bronze metal matrix composite by stir casting technique to achieve effective mechanical and corrosion properties. TiB2- Y2O3 nanocomposite powders were synthesized using the mechanical milling synthesis technique. Spectroscopic analyses like Powder X-Ray Diffraction (PXRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscope (SEM) were used to characterize the synthesized nanopowders. The XRD data revealed the average crystalline size of 110±5 nanometres with a hexagonal and cubic phase structure of TiB2 and Y2O3. The fundamental modes and other functional groups of the nanocomposite were analyzed using the FTIR analysis. The SEM images revealed the irregular morphological structures of the composite powders. The bronze metal matrix composite is fabricated by varying the weight percentage of TiB2-Y2O3 nanocomposite as 2%, 4%, and 6 wt.% with bronze alloy via stir casting technique. XRD graphs revealed the formation of metal matrix composite and the FESEM graphs revealed the porous morphology of the composite. The mechanical performance of the composite was analyzed by using the tensile, compression, and hardness tests. Specimen with 4% wt.% reinforcement material offered higher mechanical properties with 303 MPa tensile, 810 MPa compression, 141 HRB hardness, and good corrosion resistance. Hence the fabricated TiB2-Y2O3 fused bronze metal matrix composite with good mechanical and corrosion properties can be used for various sea environment applications.
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