Synthesis and characterization of nanostructured ceramics powders for biomedical applications

Camargo, Nelson Heriberto de Almeida; Bellini, O. J.; Gemelli, Enori; Tomiyama, M.

doi:10.1590/s1517-70762007000400005

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…Nanostructured biomaterials are an innovation and can offer mechanical, electric, magnetic, chemical, optical and biological features superior than conventional biomaterials with micrometric microstructures [1]. Nanostructured biomaterials composed of Ca/P, calcium phosphates and nanocomposites, and mixtures of calcium phosphates with Al 2 O 3 , SiO 2 and TiO 2 n, are being widely researched and show promising traumatologic, orthopedic and dental applications, e.g., for defect repair, bone tissue regeneration, implant fixation and tooth remineralization [2][3][4][5][6][7][8]. The literature describes different techniques and methods used in the synthesis of nanoparticulate powders and nanocomposite biomaterials [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Hydroxyapatite/TiO<SUB>2</SUB>n Nanocomposites for Bone Tissue Regeneration

Camargo¹,

Lima²

2012

AJBE

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The development of nanostructured powders and materials is an innovative alternative that promises to replace many conventional autogenous, halogenous and exogenous biomaterials in the near future. Nanostructured biomaterials stand out as a highly current research topic and appear auspicious for biomedical applications, implant fixation and bone tissue reconstruction because their features differ from conventional biomaterials in terms of wettability, granule, grains surface area, and microporosity, which are favorable for new bone formation. The hydroxyapatite used as bone matrix in this study was produced by the Biomaterials Group of the Santa Catarina State University -UDESC (Brazil). The hydroxyapatite (HA) powder was obtained from synthesis by the dissolution-precipitation reaction of solid/liquid phase of CaO and phosphoric acid to form a composition with a Ca/P molar ratio of 1.67. The powder resulting from the synthesis was calcined at 900ºC/2h, generating the HA phase with a low content of tricalcium phosphate β-TCP (whitlockite). The aim of this study was to prepare and characterize four HA/TiO 2 n nanocomposite powder compositions in the form of microporous granules in concentrations of 1, 2, 3 and 5 vol.% of TiO 2 n. The phase morphology, powder and granule surface area, and bonding bands in different powder and granule compositions were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and gas absorption (BET).

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Hydroxyapatite/TiO<SUB>2</SUB>n Nanocomposites for Bone Tissue Regeneration

Camargo¹,

Lima²

2012

AJBE

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“…Fabrication of nanostructured powders of calcium phosphate and hydroxyapatite are being worldwide investigated due to its suitable properties for biomedical applications such as high surface area, micro and nano-porosity of the particles agglomerates, small and equi-axial particles (< 200nm), and easy dissolution and absorption in biological medium, which enhance regeneration and reconstitution of bone tissues [1,2]. The nanostructured bioceramics are taking a significant place in odontological and orthopaedic applications because of its biocompatibility [3,4].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nanostructured Ceramic Powders of Calcium Phosphate and Hydroxyapatite for Dental Applications

Camargo

Lima

Souza

et al. 2008

KEM

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In the last decades many investigations have been oriented toward the development of nanostructured biomaterials such as calcium phosphate ceramics, particularly those composed of stoicheiometric hydroxyapatite (Ca10(PO4)6(OH)2) and a-and β- tricalcium phosphate (Ca3(PO4)2), which present chemical and crystallographic similarities with hard tissues (bones and teeth). Because of these characteristics, these materials can be used for reconstitution and regeneration of bone tissues. The odontological and biomedical applications are still limited due to their brittle behaviour. This study was focused in the synthesis and characterization of a bone matrix of calcium phosphate (β-TCP) and hydroxyapatite (HAP-101 e HAp-201). The results presented here are related to the morphological characterization of nanostructured powders from scanning electron microscopy viewpoint. X-ray diffraction was used to identifier the present phases in the powders and the infrared spectrometry (FTIR) was used to analyse OH bonds from hydroxyapatite and PO4 from calcium phosphates.

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“…The nanostructured ceramic materials are not a new development, because the very nature of the minerals taking part in the porcelain formation has resulted in features of the dimensions below 100 nm, which is considered "nanoscale" [3]. Recently, nanostructured materials found their applications in many advanced technologies, such as thermomechanics, aerospace, nuclear power plants, and biomedicine [4]. In traditional engineering and manufacturing processes, nanostructure applications are especially found in the form of nanoceramic and nanocomposite coatings [5] or thin films [6].…”

Section: Introductionmentioning

confidence: 99%

Hot Pressing of Tungsten Monocarbide Nanopowder Mixtures by Electroconsolidation

Gevorkyan¹,

Rucki²,

Chishkala³

et al. 2019

dtcse

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The paper presents theoretical and experimental results in the field of the manufacturing of cemented tungsten carbide materials. The important issue of avoiding any additional substances like plasticizers was challenged in order to reach the maximal possible density of sintered material while keeping its purity. To solve the problem, the electroconsolidation method of hot pressing supported by direct current was applied. The respective apparatus was constructed that enabled WC nanopowders to be sintered under pressure and high temperature during a very short time of ca. 3 minutes. In the experiments, because of the short heating time, grain size of the sintered bulk WC increased insignificantly, in general, remaining smaller than 1 μm. Similarly, sintering under hot pressing with direct current, a mixture of 3% by weight Y 2 O 3 stabilized ZrO 2 and 50% by weight WC, produced a fine structure with a uniformly distributed WC grains. The applied electric field led to the formation of a temperature gradient around the pores, with a favourable impact on the compaction of large pores and an increase in the final density of the bulk material. The experimental research confirmed that the main mechanism of the densification of nanodispersed powders of tungsten monocarbide was a locally inhomogeneous diffusion-viscous flow with intergranular slipping.

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Synthesis and characterization of nanostructured ceramics powders for biomedical applications

Cited by 7 publications

References 3 publications

Synthesis and Characterization of Hydroxyapatite/TiO<SUB>2</SUB>n Nanocomposites for Bone Tissue Regeneration

Synthesis and Characterization of Hydroxyapatite/TiO<SUB>2</SUB>n Nanocomposites for Bone Tissue Regeneration

Synthesis and Characterization of Nanostructured Ceramic Powders of Calcium Phosphate and Hydroxyapatite for Dental Applications

Hot Pressing of Tungsten Monocarbide Nanopowder Mixtures by Electroconsolidation

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