Magnetic Fe2P nanowires and Fe2P@C core@shell nanocables

Abstract

We report the synthesis of one-dimensional (1-D) magnetic Fe 2 P nanowires and Fe 2 P@C core@shell nanocables by the reactions of triphenylphosphine (PPh 3 ) with Fe powder (particles) and ferrocene (Fe(C 5 H 5 ) 2 ), respectively, in vacuum-sealed ampoules at 380-400 °C . The synthesis is based on chemical conversion of micrometer or nanometer sized Fe particles into Fe 2 P via the extraction of phosphorus from liquid PPh 3 at elevated temperatures. In order to control product diameters, a convenient sudden-temperature-rise strategy is employed, by means of which diameter-uniform Fe 2 P@C nanocables are prepared from the molecular precursor Fe(C 5 H 5 ) 2 . In contrast, this strategy gives no obvious control over the diameters of the Fe 2 P nanowires obtained using elemental Fe as iron precursor. The formation of 1-D Fe 2 P nanostructures is ascribed to the cooperative effects of the kinetically induced anisotropic growth and the intrinsically anisotropic nature of hexagonal Fe 2 P crystals. The resulting Fe 2 P nanowires and Fe 2 P@C nanocables display interesting ferromagnetic-paramagnetic transition behaviors with blocking temperatures of 230 and 268 K, respectively, significantly higher than the ferromagnetic transition temperature of bulk Fe 2 P (T C = 217 K).

Co2P: A facile solid state synthesis and its applications in alkaline rechargeable batteries

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Citotoxicidade e genotoxicidade de nanotubos de carbon

“…35 Este tipo de NTC também foi utilizado com sucesso para liberação de acetilcolina, no cérebro, no tratamento de camundongos com a doença de Alzheimer. 36 Assim, essas dezenas de aplicações podem vir a consumir toneladas de NTC e mostram que os mesmos são efetivamente de grande interesse tecnológico sendo, portanto, importante para nanofarmacologia e a nanomedicina a realização de estudos de cito-e genotoxicidade de amostras de NTCs.…”

“…54 Em análises realizadas por microscopia eletrônica os NTCs são encontrados principalmente nos lisossomos e nas mitocôndrias. 36 …”

SO3H‐functionalized nano‐MGO‐D‐NH2: Synthesis, characterization and application for one‐pot synthesis of pyrano[2,3‐d]pyrimidinone and tetrahydrobenzo[b]pyran derivatives in aqueous media

“…Because of the presence of hydrophilic functional moieties such as epoxide, hydroxyl and carboxylic groups in addition to its very large aromatic surface, GO has the double advantage of both retaining the excellent mechanical and thermal properties of graphene while alleviating the dispersibility problem of pristine graphene sheets in aqueous media. Consequently, graphene and its oxidized analogues have been introduced as efficient materials for the preparation of hybrid composites through introduction of a wide variety of functionalities which have gained marked popularity in the literature, both theoretically and experimentally, and offer promising potential in scientific fields such as energy research, [20,21] catalysis [22,23] and electrochemical analysis. [24] Several studies have pointed out the synergistic interactions that GO can have with a wide class of biomolecules such as enzymes and organic dyes through covalent or non-covalent linkages and reported improved performances in conversion and yields.…”