73 research outputs found
Giant magnetocapacitance effect: (a) B-dependent magnetic permeability (μ<sub>r</sub>) and delimited magnetic phase profile; (b) variable dielectric constant as a function of B field for the O<sub>2</sub> treated SrFe<sub>12</sub>O<sub>19</sub> ceramics at a frequency of 100Hz and room temperature (300K).
<p>Giant magnetocapacitance effect: (a) B-dependent magnetic permeability (μ<sub>r</sub>) and delimited magnetic phase profile; (b) variable dielectric constant as a function of B field for the O<sub>2</sub> treated SrFe<sub>12</sub>O<sub>19</sub> ceramics at a frequency of 100Hz and room temperature (300K).</p
Modified Curie-Weiss law calculation.
<p>(a) Logarithm of (1/ε-1/ε<sub>d</sub>) as a function of logarithm of (T-T<sub>d</sub>) at 10 kHz. and (b) logarithm of (1/ε-1/ε<sub>m</sub>) as a function of logarithm of (T-T<sub>m</sub>) at 100 kHz for the SrFe<sub>12</sub>O<sub>19</sub> ceramic being sintered at 1150°C for 1 hour and subsequently annealed in O<sub>2</sub> for 9 hours with 3 steps wise.</p
Assembly of Multifunctionalized Gold Nanoparticles with Chemiluminescent, Catalytic, and Immune Activity for Label-Free Immunoassays
In
this study, we report a universal label-free immunoassay to detect
antigen based on multifunctionalized gold nanoparticles (MF-GNPs),
which were obtained by successive assembly of <i>N</i>-aminobutyl-<i>N</i>-ethylisoluminol functionalized gold nanoparticles (ABEI-GNPs)
with antibody, bovine serum albumin (BSA) and Co<sup>2+</sup>. MF-GNPs
exhibited excellent chemiluminescent (CL), catalytic and immune activity.
It was demonstrated that the CL signal of MF-GNPs decreased in the
presence of antigens via antigen–antibody specific binding
using human immunoglobulin G (hIgG) and corresponding antibody goat
anti-human IgG (anti-hIgG) as a model system, due to that immunoreaction
led to the aggregation of GNPs. According to the decreased CL intensity,
hIgG could be determined in the range of 1.0 fM to 1.0 nM with a low
detection limit of 0.13 fM. Furthermore, this CL strategy was also
confirmed to be a general one by replacing hIgG with heart-type fatty
acid-binding protein (H-FABP), which is a biomarker of early acute
myocardial infarction (AMI). The CL strategy could be employed to
detect H-FABP ranging from 10.0 fM to 10.0 nM, and the detection limit
is 7.8 fM. The CL strategy also showed good selectivity. It might
be extended to detect other antigens if their corresponding antibodies
are available
The equivalent circuit for the complex impedance of SrFe<sub>12</sub>O<sub>19</sub> ceramics, the scheme is composed of two series linked sub-circuits with a capacitor and a resistor parallelly connected.
<p>The equivalent circuit for the complex impedance of SrFe<sub>12</sub>O<sub>19</sub> ceramics, the scheme is composed of two series linked sub-circuits with a capacitor and a resistor parallelly connected.</p
Valence band spectra of SrFe<sub>12</sub>O<sub>19</sub> ceramics (a) with O<sub>2</sub> heat treatment and (b) without O<sub>2</sub> heat treatment.
<p>The dotted lines marked the top of the valence band.</p
Magnetoelectric Response in Multiferroic SrFe<sub>12</sub>O<sub>19</sub> Ceramics - Fig 1
<p>(a) XRD pattern of SrFe<sub>12</sub>O<sub>19</sub> with O<sub>2</sub> annealing process. (b) the standard diffraction pattern of the SrFe<sub>12</sub>O<sub>19</sub>(PDF#33–1340) being marked by discrete red lines.</p
(a) The saturated ferroelectric polarization hysteresis (P-E) loop, and (b) a plot of current as a function of voltage (I-V curve) of SrFe<sub>12</sub>O<sub>19</sub> ceramic.
<p>The ceramic has been sintered at 1150°C for 1 hour and subsequently annealed at 800°C in pure oxygen for a total duration of 9 hours in 3 steps wise. The measurement was made at a frequency of 33Hz and room temperature (300K).</p
Plot of dielectric constant as a function of temperature for SrFe<sub>12</sub>O<sub>19</sub> ceramics with O<sub>2</sub> treatment at frequencies of (a) 1kHz, (b) 10kHz and (c) 100 kHz.
<p>Plot of dielectric constant as a function of temperature for SrFe<sub>12</sub>O<sub>19</sub> ceramics with O<sub>2</sub> treatment at frequencies of (a) 1kHz, (b) 10kHz and (c) 100 kHz.</p
Modules of the complex impedance for (a) the conventional SrFe<sub>12</sub>O<sub>19</sub> ceramics being sintered at 1150°C in air only, (b) the sintered ceramic was subsequently annealed in pure oxygen atmosphere at 800°Cfor 3 hours, (c) the annealed ceramic was flipping over and once again heat treated in O<sub>2</sub>at 800°C for another 3 hours.
<p>Modules of the complex impedance for (a) the conventional SrFe<sub>12</sub>O<sub>19</sub> ceramics being sintered at 1150°C in air only, (b) the sintered ceramic was subsequently annealed in pure oxygen atmosphere at 800°Cfor 3 hours, (c) the annealed ceramic was flipping over and once again heat treated in O<sub>2</sub>at 800°C for another 3 hours.</p
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