A5034308135- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Iron-based superconductors research
- Crystallization and Solubility Studies
- Electromagnetic wave absorption materials
- Conducting polymers and applications
- Graphene research and applications
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- X-ray Diffraction in Crystallography
- Polymer Nanocomposites and Properties
- Dielectric materials and actuators
- Superconductivity in MgB2 and Alloys
- Adsorption and biosorption for pollutant removal
- Nanomaterials for catalytic reactions
- Advanced Sensor and Energy Harvesting Materials
- Magnetic properties of thin films
- Magnetic Properties of Alloys
- Geomagnetism and Paleomagnetism Studies
- Multiferroics and related materials
- Environmental remediation with nanomaterials
- Polymer Nanocomposite Synthesis and Irradiation
- Supercapacitor Materials and Fabrication
- Dielectric properties of ceramics
Johns Hopkins University
2021-2023
Argonne National Laboratory
2018-2023
Louisiana State University
2014-2021
Louisiana State University Agricultural Center
2017
Aga Khan University
1999
Polypyrrole coated Fe<sub>3</sub>O<sub>4</sub> nanoparticles have effectively enhanced the EMI shielding of epoxy nanocomposites compared with physically mixed nanofillers.
Magnetic carbon–iron nanoadsorbents fabricated by carbonizing cellulose and reducing Fe3O4 nanoparticles or Fe(NO3)3 (the products are denoted as MC–O MC–N, respectively) have demonstrated great Cr(VI) removal. MC–N with a higher proportion of zero-valence iron (ZVI) bigger specific surface area exhibited better resistance to oxygen acid than due its smaller pore size. The removal was highly pH-dependent. For example, 4.0 mg L−1 neutral solution completely purified 2.5 g within 10 min. 1000...
The growth mechanism of magnetic nanoparticles (NPs) in the presence graphite oxide (GO) has been investigated by varying iron precursor dosage and reaction time (product donated as MP/GO). synthesized NPs were anchored on GO sheets due to abundant oxygen-containing functionalities such carboxyl, hydroxyl epoxy functional groups. introduced changed intrinsic lattice structure basal indicated FT-IR, Raman XRD analysis, this effect was enhanced increasing amount precursor. Uniform distribution...
Highly efficient electromagnetic field absorption at gigahertz (GHz) was reported in the novel magnetic polymer nanocomposites (MPNCs) with in-situ synthesized Fe@Fe2O3 core@shell nanoparticles (NPs) or their decorated multiwall carbon nanotubes (MWNTs) dispersed polypropylene (PP) matrix through a one-pot bottom-up method. PP grafted maleic anhydride (PP-g-MA) different molecular weights served as surfactant to stabilize in-situ-formed NPs and simultaneously compatibilizer enhance bonding...
Novel papers based on epoxy nanocomposites with magnetite and carbon nanofiber (CNF) nanohybrids, without any surface modification to the nanofillers, show combined conductive, magnetic, magnetoresistive properties. Negative magnetoresistance (MR) is observed in synthesized nanohybrid for first time. These have potential applications flexible electronics, sensors, printing industry.
It was well established that microwave radiation utilized initially to enhance the electrical conductivity of polymer nanocomposites (PNCs) by introducing carbon nanotubes (CNTs) without using any solvent.High obtained in polypropylene (PP) with low CNTs loading levels.Under an inert gas protection, were heated through transformation electromagnetic energy into mechanical vibrations.The surface PP easily molten heat generated CNTs, then a well-formed network built under proper treatment...
The new function of polypyrrole (PPy) to serve as a coupling agent has been demonstrated in preparing conductive epoxy resin nanocomposites with PPy coating on magnetite (f-Fe3O4) nanoparticles. effects magnetic nanofiller loading level the rheological behavior, thermal stability, dynamic mechanical properties, electrical conductivity, dielectric properties and were systematically studied. Compared pure suspension, reduced viscosity was observed nanosuspensions 5.0 wt% f-Fe3O4 nanoparticles,...
We report the electronic structure, synthesis, and measurements of magnetic, transport, thermal properties polycrystalline noncentrosymmetric compound ${\mathrm{Re}}_{6}\mathrm{Zr}$. observed a bulk superconducting transition at temperature ${T}_{c}\ensuremath{\sim}6.7$ K, measured resistivity, heat capacity, conductivity, London penetration depth below transition, as well performed doping pressure studies. From these we extracted critical field parameters Our indicate relatively weak to...
A maximum negative MR value of −7.5% and −3.5% was detected for the PANI–CFs in vertical diagonal directions, respectively.
The Drude model modified by Debye relaxation time was introduced to determine the plasma frequency (ωp) in surface initiated polymerization (SIP) synthesized β-silicon carbide (β-SiC)/polyaniline (PANI) metacomposites. calculated for these metacomposites with different loadings of β-SiC nanoparticles ranging from 6.11 × 10(4) 1.53 10(5) rad s(-1). relationship between negative permittivity and indicates existence switching frequency, at which changed positive. More interestingly,...
Dirac and Weyl semimetals host exotic quasiparticles with unconventional transport properties, such as high magnetoresistance carrier mobility. Recent years have witnessed a huge number of newly predicted topological from existing databases; however, experimental verification often lags behind predictions. Common reasons are synthetic difficulties or the stability phases. Here, we report synthesis type-II semimetal Ir2In8S, an air-stable compound new structure type. This material has two...
The evolution of the magnetic and charge transport properties itinerant metal MnSi with substitution Al Ga on Si site is investigated. We observe an increase in unit cell volume indicating that both substitutions create negative chemical pressure. There are substantial increases Curie temperature ordered moment demonstrating give magnetism a stronger character. also range field where skyrmion phase stable due to change character magnetism. In contrast behavior pure expectations for intrinsic...
We report the measurements of de Haas-van Alphen (dHvA) oscillations in noncentrosymmetric superconductor BiPd. Several pieces a complex multisheet Fermi surface are identified, including small pocket ($\ensuremath{\alpha}\ensuremath{\sim}40$ T) which is three dimensional and anisotropic. From temperature dependence amplitude oscillations, cyclotron effective mass ($0.18\ifmmode\pm\else\textpm\fi{}0.02$) ${m}_{e}$. Further analysis revealed nontrivial $\ensuremath{\pi}$-Berry phase...
The noncentrosymmetric superconductor (NCS) AuBe is investigated using a variety of thermodynamic and resistive probes in magnetic fields up to 65~T temperatures down 0.3~K. Despite the polycrystalline nature samples, observation complex series de Haas-van Alphen (dHvA) oscillations has allowed calculated bandstructure for be validated. This permits BCS parameters describing superconductivity estimated, despite complexity measured Fermi surface. In addition, displays nonstandard field...
Thiol functionalized magnetite nanoparticles increased the mechanical properties of polymer matrix while introducing magnetic properties.
Our previous studies have shown that subthreshold concentrations of two platelet agonists exert synergistic effects on aggregation. Here we studied the mechanism interaction 5-hydroxytryptamine (5-HT) and epinephrine mediated We show 5-HT had no or little effect aggregation but it did potentiate response epinephrine. The (1-5 µM) (0.5-2 was inhibited by α2-adrenoceptor blocker (yohimbine; IC50= 0.4 µM), calcium channel blockers (verapamil diltiazem with IC50 10 48 mM, respectively), PLC...
Unique negative giant magnetoresistance (GMR) of up to −43% at room temperature was observed in the 10 wt% titania/polyaniline (TiO2/PANI) nanocomposites prepared by simple oxidation polymerization. And MR value further evaluated using forward interference model. Other properties were tested and comparatively reported. The resistivity TiO2/PANI decreased with increasing temperature, indicating a semiconductor behavior. Mott variable range hopping (VRH) approach indicated that are disordered...
Mesoporous carbon nanocomposites, synthesized from natural wood<italic>via</italic>a catalytic graphitization reaction, show excellent adsorption of toxic pollutants water.
Pd${}_{3}$Pb has recently been predicted to host topological features consisting of a combination triple nodal points, Dirac and open Fermi arcs. Authors' magnetotransport measurements show that shares many with other semimetals, including highly anisotropic surface, large transverse magnetoresistance, pronounced Shubnikov-de Hass oscillations. The quantum oscillations indicate its electronic structure imparts non-trivial Berry phase Pd${}_{3}$Pb, potentially associated the complex theoretically.