Anantharaman, M R; Malini, K A; Sindhu, S; Mohamed, E M; Date, S K; Kulkarni, S D; Joy, P A; Philip, Kurian(Springer, May 14, 2001)
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Abstract:
Rubber ferrite composites containing various mixed ferrites were prepared for different
compositions and various loadings. The magnetic and dielectric properties of the fillers as well as the ferrite
filled matrixes were evaluated separately. The results are correlated. Simple equations are proposed to
predetermine the magnetic and dielectric properties. The validity of these equations is verified and they are
found to be in good agreement. These equations are useful in tailoring the magnetic and dielectric properties of
these composites with predetermined properties
Description:
Bull. Mater. Sci., Vol. 24, No. 6, December 2001, pp. 623–631
Anantharaman, M R; Veena Gopalan, E; Malini, K A; Santhosh Kumar, G; Narayanan, T N; Joy, P A; Al-Omari, I A; Yasuhiko, Yoshida; Sakthi Kumar, D(Springer, April 2, 2010)
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Abstract:
Potential applications of nickel nanoparticles
demand the synthesis of self-protected nickel nanoparticles
by different synthesis techniques. A novel and simple
technique for the synthesis of self-protected nickel nanoparticles
is realized by the inter-matrix synthesis of nickel
nanoparticles by cation exchange reduction in two types of
resins. Two different polymer templates namely strongly
acidic cation exchange resins and weakly acidic cation
exchange resins provided with cation exchange sites which
can anchor metal cations by the ion exchange process are
used. The nickel ions which are held at the cation exchange
sites by ion fixation can be subsequently reduced to metal
nanoparticles by using sodium borohydride as the reducing
agent. The composites are cycled repeating the loading
reduction cycle involved in the synthesis procedure. X-Ray
Diffraction, Scanning Electron Microscopy, Transmission
Electron microscopy, Energy Dispersive Spectrum, and
Inductively Coupled Plasma Analysis are effectively
utilized to investigate the different structural characteristics
of the nanocomposites. The hysteresis loop parameters
namely saturation magnetization and coercivity are measured
using Vibrating Sample Magnetometer. The thermomagnetization
study is also conducted to evaluate the
Curie temperature values of the composites. The effect of
cycling on the structural and magnetic characteristics of the
two composites are dealt in detail. A comparison between
the different characteristics of the two nanocomposites is
also provided
Anantharaman, M R; V P N Nampoori; Radhakrishnan, P; Girijavallabhan, C P; Sajan, D George; Saravanan, S; Venkatachalam, S(Physical Review, American Physical Society, June 8, 2004)
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Abstract:
Thermal diffusivity of the composites of camphor sulphonic acid (CSA) doped polyaniline (PANI) and its
composites with cobalt phthalocyanine (CoPc) has been measured using open cell photoacoustic technique.
Analysis of the data shows that the effective thermal diffusivity value can be tuned by varying the relative
volume fraction of the constituents. It is seen that polaron assisted heat transfer mechanism is dominant in CSA
doped PANI and these composites exhibit a thermal diffusivity value which is intermediate to that of CSA
doped PANI and CoPc. The results obtained are correlated with the electrical conductivity and hardness
measurements carried out on the samples
Anantharaman, M R; Al-Harthi, S H; Mohammed, Elzain; Muataz, Al-Barwani; Amal, Kora'a; Thomas, Hysen; Myo, Tay Zar Myint(Springer, 2012)
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Abstract:
Roughness and defects induced on few-layer graphene (FLG) irradiated by Ar+ ions at different energies were
investigated using X-ray photoemission spectroscopy (XPS) and atomic force microscopy techniques. The results
provide direct experimental evidence of ripple formation, sp2 to sp3 hybridized carbon transformation, electronic
damage, Ar+ implantation, unusual defects and edge reconstructions in FLG, which depend on the irradiation
energy. In addition, shadowing effects similar to those found in oblique-angle growth of thin films were seen.
Reliable quantification of the transition from the sp2-bonding to sp3-hybridized state as a result of Ar+ ion irradiation
is achieved from the deconvolution of the XPS C (1s) peak. Although the ion irradiation effect is demonstrated
through the shape of the derivative of the Auger transition C KVV spectra, we show that the D parameter values
obtained from these spectra which are normally used in the literature fail to account for the sp2 to sp3 hybridization
transition. In contrast to what is known, it is revealed that using ion irradiation at large FLG sample tilt angles can
lead to edge reconstructions. Furthermore, FLG irradiation by low energy of 0.25 keV can be a plausible way of
peeling graphene layers without the need of Joule heating reported previously
Description:
Al-Harthi et al. Nanoscale Research Letters 2012, 7:466