Carbon material-nanoferrite composite for radiation shielding in microwave frequency

In sequence to permit electronic gadgets to coexist without maleficent electromagnetic interference (EMI) it is essential to evolve new absorbing and shielding materials with good performance. These technological fields demand not only efficient shields but also materials that meet specific criteria for each engineered design. For example chemical and corrosion resistance, lightweight, flexibility, tunable morphology, processing easiness and inexpensiveness are required. The concerned work present BF/EG composite was appreciated for these applications. The Microwave absorption characteristic were find out in the frequency range 8-12 GHz. Shielding effectiveness of BF/EG composite was obtained 52.4 dB. The material is found to have good microwave absorption materials for EMI shielding applications

Eruption cysts: A series of two cases

Eruption cysts are benign cysts that appear on the mucosa of a tooth shortly before its eruption. They may disappear by themselves but if they hurt, bleed or are infected they may require surgical treatment to expose the tooth and drain the contents. Here we present 2 case reports of eruption cysts presenting with different chief complaint. The treatment included incising the eruption cyst and draining the contents of the cyst

Synthesis of some novel 5, 6-dihydro-6-[4'-substituted phenyl]-12<i>H</i>- indeno [2, 1-<i>c</i>]-1, 5-benzodiazepin-7-ones

1322-1324Synthesis of hitherto unknown 5, 6-dihydro-6-phenyl-12H-indeno[2, 1-c]-1, 5-benzodiazepin-7-ones 2 through Michael type addition of o-phenylenediamine to 2-benzylideneindane-1, 3-diones is reported

Synergistic effect of polypyrrole/BST/RGO/Fe3O4 composite for enhanced microwave absorption and EMI shielding in X-Band

Present study focus on the designing of high performance microwave absorbing material against electromagnetic pollution. Herein we synthesize conducting polymer based composite encapsulated with Barium strontium titanate (BST), reduced graphene oxide (RGO), and Fe3O4 nanoparticles via chemical oxidative polymerization of pyrrole. The synthesized composite materials were thoroughly characterized using SEM, FTIR, XRD, TGA, and VSM techniques. The presence of filler materials in conducting polymer matrix leads to absorption dominated shielding effectiveness value of 48 dB in the frequency range of 8.2-12.4 GHz (X-band). Moreover, presence of dielectric and magnetic fillers increases the thermal and chemical stability of the composite material. The obtained shielding effectiveness value is above the recommended limit (30-40 dB) required for the commercial applications, therefore these composite material could be used as effective shield against EM pollution

Encapsulation of Barium Ferrite and Reduced Graphene Oxide in poly(o-toluidine) as a Barrier for Electromagnetic Radiations

The present paper reports the synthesis and characterization of poly (o-toluidine) (POT) embedded with barium ferrite and reduced graphene oxide. Barium ferrite nanoparticles (BF) were prepared by citrate precursor technique. Synthesis of reduced graphene oxide (RGO) from graphite powder was carried out by improved Hummer's method. Composite of poly (o-toluidine) with barium ferrite and reduced graphene oxide (POT/BF/RGO) was synthesized by in-situ polymerization method. The formulation shows total shielding effectiveness of 12.07 dB in the X-band (8.4-12.4 GHz) frequency range. Permeability and dielectric parameters have been calculated from the measured scattering parameters (S11, S22, S12, S21) using the Nicolson-Ross-Weir algorithm. The synthesized formulations were characterized using x-ray diffraction (XRD), scanning electron microscope (SEM), Transmission electron microscopy TEM, Ultraviolet-visible spectroscopy (UV-Vis) and vibrating sample magnetometer (VSM)

Synthesis and electromagnetic shielding behaviour of poly(o-toluidine)/red mud composite

This paper is an attempt to find out application of red mud in controlling electromagnetic pollution. Composite of PoT/RM has been prepared by in-situ chemical oxidative polymerization and has been tested for electromagnetic shielding effectiveness. Red mud here acted as a filler material. The incorporation of 50wt% red mud in the polymer matrix results in a shielding effectiveness of 8.9dB in 8.2 to 12.4GHz frequency range (X-band). Furthermore, the structural analysis, morphology, and magnetization have been studied using XRD, TEM, and VSM techniques, respectively. TEM image of the composite shows the distribution of red mud particles in the polymer matrix. The magnetization decreases on incorporation of red mud in the polymer matrix

Electromagnetic shielding behavior of polyaniline using Red Mud (industrial waste) as filler in the X - band (8.2-12.4 GHz) frequency range

In today's times where pollution of all kinds is at its peak, numerous efforts are being made to find proper waste disposal methods. Moving on the same lines, this paper presents an economical and environmentally safe method of disposal of red mud to control electromagnetic pollution by using it as an electromagnetic shielding material. Composites of PANI/RM have been prepared by in-situ chemical oxidative polymerization and have been tested for structural analysis, thermal stability and magnetization by XRD, TGA and VSM techniques respectively. Further, the composites have shown shielding effectiveness of 33-41 dB (>99.99% attenuation) in 8.2-12.4 GHz frequency range (X-band) at a thickness of 3 mm which is absorption dominated. Thus, the results conclude that the incorporation of red mud into polymer matrix can serve two purposes firstly, it can provide a good alternative as a shielding material and secondly, it can prove to be a feasible way of waste disposal

Antileishmanial action of Tephrosia purpurea linn, extract and its fractions against experimental visceral leishmaniasis

Tephrosia purpurea (family: Fabaceae), which is used in traditional remedies for the treatment of febrile attacks, enlargement and obstruction of liver, spleen, and kidney, was found to have significant antileishmanial activity, and has been extensively fractionated to locate the abode of activity. A fraction (F062) obtained from N-butanol extract of T. purpurea showed consistent antileishmanial activity at 50 mg/ kg × 5 days by oral route against Leishmania donovani infection in hamsters. Activity was further confirmed in a secondary model, i.e., Indian langur monkeys (Presbytis entellus). Thus, the fraction F062 from this plant possesses potential to produce significant antileishmanial activity by oral route without producing any toxic side effects