Toward Low-Cost and Sustainable Supercapacitor Electrode Processing: Simultaneous Carbon Grafting and Coating of Mixed-Valence Metal Oxides by Fast Annealing

There is a rapid market growth for supercapacitors and batteries based on new materials and production strategies that minimize their cost, end-of-life environmental impact, and waste management. Herein, mixed-valence iron oxide (FeOx) and manganese oxide (Mn3O4) and FeOx-carbon black (FeOx-CB) electrodes with excellent pseudocapacitive behavior in 1 M Na2SO4 are produced by a one-step thermal annealing. Due to the in situ grafted carbon black, the FeOx-CB shows a high pseudocapacitance of 408 mF cm−2 (or 128 F g−1), and Mn3O4 after activation shows high pseudocapacitance of 480 mF cm−2 (192 F g−1). The asymmetric supercapacitor based on FeOx-CB and activated-Mn3O4 shows a capacitance of 260 mF cm−2 at 100 mHz and a cycling stability of 97.4% over 800 cycles. Furthermore, due to its facile redox reactions, the supercapacitor can be voltammetrically cycled up to a high rate of 2,000 mV s−1 without a significant distortion of the voltammograms. Overall, our data indicate the feasibility of developing high-performance supercapacitors based on mixed-valence iron and manganese oxide electrodes in a single step

Multilayer Thin Films on Fine Particles

The tunable construction of multilayer thin-film-based particulate has opened up new horizons in materials science and led to exciting new developments in many scientific areas during the past two decades. Indeed, to utilize the synergistic properties of thin film coatings and the core particles, the thin film immobilized on fine particles can be a promising approach. The interaction between the thin films and the core fine particles results in adjustable properties of the coated particles. Therefore, such coated systems have been considered as an important class of emerging powder technology for a wide range of applications. Namely, multilayer structural features can lead to designing a highly active and selective catalytic systems. In addition, multilayer-coated nano/micro particles (NMPs) can be employed in the development of many new properties, ease of functionalization, conjugation of biomolecules, etc. Such structure with multilayer coatings can also revolutionize the energy storage and conversion systems

THE STUDY OF EPIDEMIOLOGY AND HYDATID CYST PRIMARY AND FINAL DIAGNOSIS IN PATIENTS HOSPITALIZED IN THE SURGERY UNIT OF SHAHID DANESHVARI HOSPITAL, TEHRAN, IRAN 2007 TO 2017

Hydatid cyst disease is of great importance; it infects very critical organs in humans, especially liver and lungs, and as for animals, it inflicts significant losses on animal husbandry economy. Thus, providing accurate diagnosis is of great importance for treating this disease and preventing its complications. The present study aimed at studying the epidemiology and hydatid cyst first and final diagnosis in patients hospitalized in the surgery unit of Daneshvari Hospital, Tehran from 2007 to 2017. The present study is retrospective cross-sectional study. The statistical population of the present study was all the patients suffering from hydatid cyst who were hospitalized at Daneshvari Hospital and underwent surgery from2007 to 2017. From the 110 patients suffering from hydatid cyst hospitalized, 48 were male, and 62were female. With respect to the infected organ, 53 patients were infected in liver, 48 patients were infected in lungs, and 9 patients were infected in both liver and lungs. As many as 98 patients had one cyst, and 12 patients had more than one cyst. 52 patients with medical ultrasound, 47 patients with medical ultrasound and CT scan, 10 patients with chest x-ray, and one patient with serological testing. The total findings of the study indicate that given the patients’ profiles and clinical symptoms, the diagnosis of this disease was desirable and is consistent with other studies. In cases, where it was impossible to diagnose hydatid cyst with clinical and Para clinical evidence, it is of great help to the geographical as well as epidemiological status of the disease in the region. Key words: Epidemiology, Hydatid Cyst, Diagnosis, Tehran

A new homatropine potentiometric membrane sensor as a useful device for homatropine hydrobromide analysis in pharmaceutical formulation and urine: a computational study

Homatropine (Equipin, Isopto Homatropine) is an anticholinergic medication that inhibits muscarinic acetylcholine receptors and thus the parasympathetic nervous system. It is available as the hydrobromide or methylbromide salt. In this study, a potentiometric liquid membrane sensor for simple and fast determination of homatropine hydrobromide in pharmaceutical formulation and urine was constructed. For the membrane preparation, homatropine-tetraphenylborate complexes were employed as electroactive materials in the membrane. The proposed sensor presents wide linear range (10-5-10-1 mol L-1), low detection limit (8×10-6 mol L-1), and fast response time (ca. 10 s). Validation of the method shows suitability of the sensors for applicability in the quality control analysis of homatropine hydrobromide in pharmaceutical formulation and urine

Curing epoxy with ethylenediaminetetraacetic acid (EDTA) surface-functionalized CoxFe3- xO4 magnetic nanoparticles

In this work, the bulk and surface composition of Fe3O4 supermagnetic nanoparticles were modified for efficient epoxy curing. The bare, ethylenediaminetetraacetic acid (EDTA) capped, and cobalt (Co)-doped EDTA capped Fe3O4 nanoparticles were synthesized electrochemically. The crystalline structure and phase information, surface capping, morphology and magnetization behavior of nanoparticles were studied by X-Ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FE-SEM) and vibrating sample magnetometer (VSM), respectively. A low amount of the prepared nanoparticle (0.1¿wt.%) was used in preparation of epoxy nanocomposites. Nonisothermal differential scanning calorimetry (DSC) under different heating rates was performed to study the potential of nanoparticles in curing epoxy resin with an aliphatic amine. The heat release data on nanocomposites suggest that EDTA capped Co-doped Fe3O4 considerably improved the curing reaction between epoxy resin and the curing agent. Calculations based on Cure Index approved qualitatively a shift from Poor to Good cure by concurrent lattice and surface modifications of magnetic nanoparticles. It is bielived that the approach used in this work can pave the way to enhance curability of epoxy nanocomposites by the combined modification of bulk and surface of nanoparticlesPostprint (author's final draft