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Betal Atanu Bera Jayanta Alam Mahfooz Gandi Appala Naidu Sahu Satyajit 《Journal of Computational Electronics》2022,21(1):227-234
Journal of Computational Electronics - The strain- and electric field-dependent electronic and optical properties of monolayer GaInS2 have been calculated using density functional... 相似文献
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Magnetoelectric Response in (1−x)PbZr0.65Ti0.35O3–xBaFe12O19 Multiferroic Ceramic Composites
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José D. S. Guerra Soutik Betal Madhuparna Pal José E. Garcia Adilson J. A. Oliveira Jean‐Claude M'Peko Antonio C. Hernandes Ruyan Guo Amar S. Bhalla 《Journal of the American Ceramic Society》2015,98(5):1542-1547
The magnetoelectric (ME) properties of PbZr0.65Ti0.35O3–BaFe12O19 (PZT–BaM) multiferroic ceramic composites have been investigated in this work. These materials, containing both the ferroelectric PZT and ferrimagnetic BaM phases, were prepared from the conventional solid‐state reaction method, and their main (micro)structural characteristics are provided. The ME measurements were performed over wide frequency and temperature ranges, and the influence of the BaM content was appraised. An enhanced ME coefficient (α) was obtained for the applied magnetic field of 0.8 kOe, at 97 kHz. In addition, the results reveal a high thermal stability of α in the whole analyzed temperature range, showing that the studied PZT‐based ceramic composites have great potential for practical applications. 相似文献
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A series of copolyesters having a broad range of biodegradable crosslinks were synthesised by FeCl3‐catalyzed polyesterification of trimellitic acid and glycerol containing a small mol percent of poly(ethylene glycol) (PEG) of varied molecular weights. The polymer samples designated as I (1.5% PEG 2000), II (4.5% PEG 2000), III (7.5% PEG 2000), IV (1.5% PEG 4000), V (4.5% PEG 4000), VI (7.5% PEG 4000), VII (1.5% PEG 6000), VIII (4.5% PEG 6000), and IX (without PEG) are insoluble and moderately tough‐to‐elastic solids and were characterized by their swelling values in ethanol, glass transition temperatures (Tg), IR spectra, and X‐ray diffractograms. Sample IX (0% PEG) has the lowest equilibrium swelling (12% at 25°C) and the highest Tg (155°C) and, therefore, the highest crosslink density. The swelling increases and the Tg decreases as the PEG content or PEG molecular weight in a glycerol–PEG combination increases, indicating a corresponding decrease in the crosslink density of the polymers. Further, the equilibrium swelling value increases with increasing temperature. The IR spectra of the polymers indicate the formation of ester bonds at the expense of COOH and OH groups. The X‐ray diffractograms show their semicrystalline nature. The percent crystallinity values of 53, 52, 49, and 46 for II, III, V, and VII, respectively, and 54 for IX showed that the percent crystallinity decreases with an increasing PEG content and molecular weight in the same way as do the Tg values. Thus, higher Tg values are associated with a higher percent crystallinity, that is, with structures of higher order. The synthesized polymer samples with varied crosslink (biodegradable) densities are expected to be very suitable as matrices for controlled drug delivery over a varied period of time. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 343–346, 2004 相似文献
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Lance D. Blumhardt Silas Barbosa Neil Roberts Dibendu Betal Christophe Gratin 《Magma (New York, N.Y.)》1994,2(3):319-322
We have carried out a comparative cross-sectional study of patients with relapsing and remitting MS (multiple sclerosis) (RRMS) (n=9), primary progressive MS (PPMS) (n=7), and secondary progressive MS (SPMS) (n=10) using image analysis techniques to determine the number and volume of Gd-DTPA-enhancing lesions. RRMS patients had more lesions than either PPMS or SPMS (ns), and the mean volume of the lesions (p=0.006) and the total volume of enhancing lesions (p<0.03) were significantly larger in patients with RRMS compared with PPMS. The prevalence of blood-brain barrier (BBB) breakdown appears to be similar in PPMS and SPMS, with the higher rate in RRMS suggesting a suppressive effect of disease duration (and/or age). Similarly, the volume of the lesion load overall was negatively correlated with disease duration (p –0.56,p<0.003). Differences between PPMS and RRMS/SPMS patients in the volume of the enhancing lesions may reflect differences in the ability of these patients to suppress the immune-mediated damage to axons which may follow episodic BBB breakdown and which is not visualized on conventional magnetic resonance imaging. 相似文献
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Dhiraj Kumar Rana Pratip Sankar Banerjee Soutik Betal Shib Shankar Banerjee 《应用聚合物科学杂志》2024,141(4):e54857
Conventional charge storage devices made of ceramic materials have limited deformability and configurability due to their extreme stiffness. The high demand for compliant dielectrics has led researchers to look beyond conventional ceramics, despite their very high dielectric properties. In this work, a mechanically robust, highly-flexible and ultra-stretchable thermoplastic elastomeric material with dielectric characteristics has been fabricated by introducing calcium copper titanate [CaCu3Ti4O12] (CCTO) dielectric material onto macromolecular chains of styrene–isoprene–styrene (SIS) triblock copolymer via a solution-based polymer processing technique. CCTO powders have been synthesized using sol–gel technique. The resulting composite is ultra-stretchable with strain at break of ~3200% and has high dielectric permittivity of ~10. High dielectric property is attributed to the well-dispersed dielectric CCTO fillers within the SIS matrix, which provide sites for interfacial polarization and space charge accumulation. The influence of CCTO on dielectric properties has also been validated using the modified Cole–Cole model. 相似文献
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