Al2TiO5–Al2O3–TiO2 nanocomposite: Structure, mechanical property and bioactivity studies

Kalita, Samar J.; Somani, Vikas

doi:10.1016/j.materresbull.2010.09.017

Cited by 24 publications

(17 citation statements)

References 27 publications

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“…The post buckling spacing is determined by the cross section dimension of the nanowire, the Young's modulus of the nanowire and substrate, and the compressive strain, similar to that reported in previous theoretical works (Jiang et al, 2007;Kalita and Somani, 2010;Sun and Rogers, 2007).…”

Section: Continuum Model For Helical Buckling Modesupporting

confidence: 55%

Helical coil buckling mechanism for a stiff nanowire on an elastomeric substrate

Chen

Liu

Yan

et al. 2016

Journal of the Mechanics and Physics of Solids

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When a stiff nanowire is deposited on a compliant soft substrate, it may buckle into a helical coil form when the system is compressed. Using theoretical and finite element method (FEM) analyses, the detailed three-dimensional coil buckling mechanism for a silicon nanowire (SiNW) on a poly-dimethylsiloxne (PDMS) substrate is studied. A continuum mechanics approach based on the minimization of the strain energy in the SiNW and elastomeric substrate is developed. Due to the helical buckling, the bending strain in SiNW is significantly reduced and the maximum local strain is almost uniformly distributed along SiNW. Based on the theoretical model, the energy landscape for different buckling modes of SiNW on PDMS substrate is given, which shows that both the in-plane and out-of-plane buckling modes have the local minimum potential energy, whereas the helical buckling model has the global minimum potential energy. Furthermore, the helical buckling spacing and amplitude are deduced, taking into account the influences of the elastic properties and dimensions of SiNWs. These features are verified by systematic FEM simulations and parallel experiments. As the effective compressive strain in elastomeric substrate increases, the buckling profile evolves from a vertical ellipse to

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Section: Continuum Model For Helical Buckling Modesupporting

confidence: 55%

Helical coil buckling mechanism for a stiff nanowire on an elastomeric substrate

Chen

Liu

Yan

et al. 2016

Journal of the Mechanics and Physics of Solids

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“…21 Logo, foi possível obter amostras nanoestruturadas monofásicas da fase ortorrômbica do CaZrO 3 e da fase cúbica do BaZrO 3 , sendo este o objetivo do estudo. Os indicadores que expressam a qualidade dos refinamentos realizados neste trabalho, tais como R wp , CHI ** 2 e R(F**2), são satisfatórios, apresentando valores compatíveis com os encontrados para materiais nanoestruturados, 22,23 o que atesta a qualidade das medidas e refinamentos realizados neste trabalho, como pode ser verificado nas Tabelas 1 e 3. Os valores obtidos para os parâmetros de rede e para as coordenadas atômicas de cada uma das fases nanoestruturadas identificadas são muito similares aos encontrados na literatura para as respectivas fases cristalinas (Tabelas 2 e 4), particularmente os resultados obtidos para os pós nanoestruturados após tratamento térmico a 1350 °C de temperatura (Tabelas 1 e 3).…”

Section: Conclusãounclassified

Síntese e caracterização de CaZrO3 e BaZrO3 nanoestruturados

Ibiapino¹,

Figueiredo²,

Lascalea³

et al. 2013

Quím. Nova

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Recebido em 26/4/12; aceito em 17/12/12, publicado na web em 28/3/13 SYNTHESIS AND CHARACTERIZATION OF NANOSTRUCTURED CaZrO 3 AND BaZrO 3 . In this work, nanostructured samples of barium zirconate (BaZrO 3 ) and calcium zirconate (CaZrO 3 ) were synthesized by the gel-combustion method, using glycine as fuel. The ceramic powders were calcined at 550 °C for 2 h and subsequently heat treated at 1350 °C for 10 min (fast-firing). The X-ray diffraction technique was employed to identify and characterize the crystalline phases present in the synthesized powders, using the Rietveld method. Monophasic nanostructured samples of BaZrO 3 and CaZrO 3 presenting average crystallite sizes of around 8.5 and 10.3 nm, respectively, were found after fast-firing.Keywords: nanostructured materials; Rietveld method; gel-combustion method. INTRODUÇÃOA nanociência e a nanotecnologia figuram como áreas das mais atraentes e promissoras para o desenvolvimento científico e tecnoló-gico do século XXI. Na literatura científica são encontrados diversos termos a elas relacionados, dentre os quais se destacam nanopartícu-las, nanocristais, nanofios, nanofitas, nanotubos e nanocompósitos. 1Todos estes termos estão relacionados, de uma maneira ou de outra, com termos mais gerais que muitas vezes se confundem, como os de nanomateriais e materiais nanoestruturados, definidos como sendo quaisquer materiais que possuam pelo menos uma dimensão da ordem de 1-100 nanômetros e como materiais policristalinos com tamanho de grão da ordem de 1-100 nanômetros. 2,3Verificou-se que, quando as partículas ou cristalitos que formam um determinado material se apresentam na escala nanométrica, ou seja, no caso de materiais nanoestruturados, estes muitas vezes exibem propriedades diferentes daquelas apresentadas pelos seus respectivos similares cristalinos convencionais. Pode-se encontrar na literatura vários exemplos de como, por exemplo, propriedades magnéticas, ópticas, elétricas, térmicas e químicas podem ser afetadas pelas dimensões do material.3 O principal motivo para que esses materiais potencializem o aparecimento de propriedades físicas e químicas diferenciadas está justamente no fato dos materiais nanoestruturados apresentarem tamanho de grão tão reduzido que uma fração importante de seus átomos está localizada nos contornos de grão (ou na superfície das partículas), enquanto os materiais bulk possuem a maior parte dos átomos localizados no interior dos grãos, ou seja, em seu volume. Outra diferença é o elevado grau de desordem e defeitos (bordas de grão, defeitos pontuais, deslocações, etc.) muitas vezes apresentado pelos materiais nanoestruturados, de modo que a distância entre defeitos vizinhos é da mesma ordem de grandeza das distâncias interatômicas. Esses fatos fazem com que os materiais nanoestruturados venham despertando imenso interesse, tanto com relação aos processos de síntese quanto ao controle de suas propriedades mais variadas.O dióxido de zircônio, também conhecido como zircônia (ZrO 2 ), e as ligas a base de zircônio estão atualmente ent...

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“…1 wt% SiO 2 and 1 wt% Y 2 O 3 were added for consistency. In addition, the sol‐gel technique can be used to prepare Al 2 TiO 5 particles . This technique includes production of solution with titanium tetrabutoxide, aluminum chloride, and monohydrate citric acid and ethanol at relatively lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the sol-gel technique can be used to prepare Al 2 TiO 5 particles. [46][47][48][49] This technique includes production of solution with titanium tetrabutoxide, aluminum chloride, and monohydrate citric acid and ethanol [47] at relatively lower temperatures. This technique cannot be applicable for inclusion dissolution work for two reasons, 1) size and 2) purity.…”

Section: Introductionmentioning

confidence: 99%

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

Sharma

Dąbkowska

Dogan

2018

steel research int.

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The dissolution kinetics of micro‐particles (inclusions) in steelmaking slags is investigated using the high temperature confocal scanning laser microscope (HT ‐ CSLM). However, these studies focus on the limited type of inclusions such as Al2O3, SiO2, MgO, CaO, and MgAl2O4. To experimentally study the removability of various problematic inclusions that are not available in the market, optical floating zone and sintering techniques are presented here for the production of high purity micro‐particles. The syntheses of TiO2 and Al2TiO5 inclusions are employed to demonstrate the advantages and potential of both techniques. These inclusions are then dissolved in the steelmaking slags using CSLM at 1430 °C. In situ observation shows that there is gas evolution during the reaction between slag and Al2TiO5 particles prepared by both techniques. However, the gas evolution is more rapid during the dissolution of particles prepared by sintering and hinders in situ observations and measurements. The optical floating zone technique is capable of preparation of micro‐particles with high purity and less porosity. At 1430 °C, the Al2TiO5 particles do not dissolve at all, whereas TiO2 particles completely dissolve in 200 s.

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Al2TiO5–Al2O3–TiO2 nanocomposite: Structure, mechanical property and bioactivity studies

Cited by 24 publications

References 27 publications

Helical coil buckling mechanism for a stiff nanowire on an elastomeric substrate

Helical coil buckling mechanism for a stiff nanowire on an elastomeric substrate

Síntese e caracterização de CaZrO3 e BaZrO3 nanoestruturados

Application of Optical Floating Zone Method to Dissolution Kinetics of Inclusions in a Steelmaking Slag

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