Magnetism and transport properties of HfFe6Ge6-type Er1−x Gd x Mn6Ge6 (x=0.2−0.9) compounds

Wang, Ru-wu; Liu, Jing; Li, Yun-Bao; Wang, Dengjing; Yuan, Jie; Wang, Yuhua; Li, Yawei

doi:10.1007/s11595-010-0014-2

Cited by 45 publications

(60 citation statements)

References 12 publications

(11 reference statements)

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“…13,[28][29][30][31][32] The origin of the observed behavior is a matter of considerable discussion. Most investigators concur that the intrinsic dielectric properties of these materials are not 'colossal' and that the colossal values arise from a range of extrinsic properties such as the high dielectric values of interfaces, particularly interfaces between dielectric and electrode and grain boundaries.…”

Section: Discussionmentioning

confidence: 99%

Novel Materials with Effective Super Dielectric Constants for Energy Storage

Cortes

Phillips

2015

Journal of Elec Materi

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To test a theory of the recently discovered phenomenon of super dielectric behavior at very low frequency, the dielectric constants of several 'pastes', composed of porous alumina powders filled to the point of incipient wetness with water containing dissolved sodium chloride, were measured. The effective dielectric low frequency constants of some of the pastes were greater than 10 10 , dramatically higher than that of any material ever reported. Moreover, the total energy density reported for one capacitor generated with NaCl-based super dielectric material is marginally higher than found in any prior report. These results are consistent with this recently postulated model of low frequency super dielectric behavior in porous, non-conductive materials saturated with ion-containing liquids: upon the application of an electric field, ions dissolved in the saturating liquid contained in the pores will travel to the ends of pore-filling liquid droplets creating giant dipoles. The fields of these giant dipoles oppose the applied field, reducing the net field created per unit of charge on the capacitor plates, effectively increasing charge/voltage ratio, hence capacitance. This is simply a version of the theory of 'polarizable media' found in most classic texts on electromagnetism. Other observations reported here include (1) the impact of ion concentration on dielectric values, (2) a maximum voltage similar to that associated with the electrical breakdown of water, (3) the loss of capacitance upon drying, (4) the recovery of capacitance upon the addition of water to a dry super dielectric material, and (5) the linear relationship between capacitance and inverse thickness. All observations are consistent with the earlier proposed model of the super dielectric phenomenon. An extrapolation of results suggests this technology can lead to energy density greater than the best lithium-ion battery.

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Section: Discussionmentioning

confidence: 99%

Novel Materials with Effective Super Dielectric Constants for Energy Storage

Cortes

Phillips

2015

Journal of Elec Materi

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“…Na HAP a quente, o lipídio é previamente fundido a uma temperatura de cerca de 5 a 10 ºC acima do seu ponto de fusão, incorporando-se, em seguida, o princípio ativo. 45 A preparação de NLS por HAP a quente 38 é realizada fundindo o lipídio, contendo o princípio ativo, seguindo-se a sua dispersão por agitação mecânica 46 ou por ultrassons, 32,33,47 numa solução aquosa, aquecida à mesma temperatura, que contém um tensoativo do tipo O/A. Obtém-se, desta forma, uma "pré-emulsão", que, em seguida, é submetida à HAP, realizada a uma temperatura compreendida entre 70 e 90 ºC, resultando uma nanoemulsão do tipo O/A.…”

Section: Preparação Das Nls Por Fusão-emulsificaçãounclassified

Nanopartículas de lipídios sólidos: métodos clássicos de produção laboratorial

et al. 2011

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Recebido em 7/1/11; aceito em 20/7/11; publicado na web em 2/9/11 SOLID LIPID NANOPARTICLES: CLASSICAL METHODS OF LAB PRODUCTION. Solid lipid nanoparticles have been extensively investigated as drug delivery systems. These colloidal systems have major advantages compared to others more traditional. Reported advantages include sustained release, ability to solubilize lipophilic drugs, increased physical and chemical stability of labile molecules, decreased unwanted side-effects showing lower toxicity, and scale up facilities. This paper aims at reviewing the traditional methods of solid lipid nanoparticles production, such as fusion-emulsification (hot and cold), solvent evaporationemulsification and microemulsion, dealing with the main technological parameters that influence the quality properties of solid lipid nanoparticles.Keywords: solid lipid nanoparticle; production of methods; technological parameters. INTRODUÇÃONanopartículas lipídicas sólidas (NLS) foram desenvolvidas em 1991, como um sistema alternativo de encapsulação de princípios ativos em relação aos sistemas coloidais tradicionais, tais como emulsões, lipossomas e nanopartículas poliméricas. O grande diferencial das NLS é a sua excelente estabilidade físico-química, que proporciona maior proteção contra a degradação de fármacos lábeis.

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“…To improve its pharmacological properties, 14-thienyl methylene matrine (TMM, Fig. 1b) was prepared, its biological activity is higher than that of MT has been demonstrated in previous study [5]. Therefore, a sensitive and accurate analytical method for the simultaneous determination of TMM and MT is required to support pharmacokinetic (PK) study.…”

Section: Introductionmentioning

confidence: 99%