Influence of the polysaccharide galactomannan on the dielectrical characterization of hydroxyapatite ceramic

Macêdo, Ana Angélica Mathias; Sombra, A. S. B.; Mazzetto, Selma Elaine; Silva, C.C.

doi:10.1016/j.compositesb.2012.07.010

Cited by 8 publications

(7 citation statements)

References 14 publications

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“…Hydroxyapatite (HA) is known as a calcium phosphate ceramic with a chemical formula of Ca 10 (PO 4 ) 6 OH 2 [ 13 – 15 ]. HA is a bio-active ceramic material that has excellent properties in terms of bio-compatibility, bio-affinity, osseo-conductivity while having huge chemical similarities with human bones and teeth [ 16 – 19 ]. HA helps in promoting bone growth by forming strong chemical bonds with natural bone after the implantation process [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering parameters on physical and mechanical properties of powder injection moulded stainless steel-hydroxyapatite composite

et al. 2018

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The combination of metallic bio-inert material, stainless-steel 316L (SS316L) and a bio-active material, hydroxyapatite (HA) can produce a composite which has superior properties for orthopaedic applications. The main objective of this study is to investigate the effects of sintering temperature and holding time on the physical and mechanical properties of the sintered part. 50wt.% SS316L and 50wt.% HA were mixed with a binder system of palm stearin (PS) and polyethylene (PE) at 61 vol.% powder loading. Rheological properties show a pseudo-plastic behaviour of the feedstock, where viscosity decreases with increasing shear rate. The feedstock was injection moulded into a tensile bar shape while thermal debinding was carried out at 320°C and 500°C. The brown parts were sintered at 1000, 1100, 1200 and 1300°C, with three different sintering times of 1, 3 and 5 hours in the furnace. It was found that the highest sintered density measured was 95.61% of the theoretical density. In addition, the highest hardness and Young’s modulus measured were 150.45 HV and 52.61 GPa respectively, which are higher than those of human bone. The lowest percentage of carbon content was 0.022wt.% given by the sample sintered at 1300°C for 1 hour. Therefore, SS316L/HA composite with good mechanical and physical properties was successfully produced through the PIM process.

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Section: Introductionmentioning

confidence: 99%

Effect of sintering parameters on physical and mechanical properties of powder injection moulded stainless steel-hydroxyapatite composite

et al. 2018

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“…As sementes são constituídas por um tegumento vermelho brilhante e um endosperma gomoso e espesso, com dimensões médias de 0,93 cm de comprimento; 0,90 cm de largura e 0,62 cm de espessura [88]. Apresentam uma razão M/G aproximadamente 1:35, composta por quantidades pequenas de outros monossacarídeos [89].…”

Section: Biomateriais Poliméricosunclassified

Estudo comparativo da preparação e caracterização de cimentos à base de hidroxiapatita e galactomanana

Silva¹,

Aquino²

2023

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Este livro tem por objetivo principal mostrar um novo cimento odontológico à base de um mineral ósseo chamado hidroxiapatita (HAp) sintetizada por moagem mecânica de alta energia em moinho planetário de bolas e um polissacarídeo (galactomanana – Gal) extraída das sementes de Adenanthera pavonina L. Utilizamos como constituintes dos cimentos estudados a HAp, Gal e catalisadores comerciais (JET e LS). Os três cimentos foram preparados como segue, sendo o primeiro, na fase sólida, utilizados 75% de HAp e 25% de Gal e a fase líquida com 0,30 mL de água destilada, chamando-o HAG. Para o segundo cimento, denominado HAGJET, a fase sólida foi a mesma do cimento HAG e a fase líquida 0,10 mL do catalisador JET e 0,20 mL de água destilada. O terceiro cimento (HAGLS), teve sua fase sólida constituída por 60% de HAp e a líquida por 40% de solução de Gal e 0,10 mL do catalisador comercial LS. Os cimentos foram caracterizados por Difração de Raios-X, Análises Térmicas, Espectroscopia de Infravermelho, Método da Cavidade Ressonante, Grau de Intumescimento, Micro dureza, Microscopia de Varredura, tempo de presa, escoamento e solubilidade, obtendo excelentes resultados utilizando a HAp e ao Gal, associados com catalisadores comerciais.

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“…The crude galactomannan was extracted from the seeds of Adenanthera pavonina L. The endosperms were obtained after heating the seeds in boiling distilled water for 20 minutes with enzymatic inactivation, followed by swelling for 12 hours. The seed coats were removed and then the endosperms were separated from the embryo and stored under refrigeration [34].…”

Section: Bioceramics Preparationmentioning

confidence: 99%

“…HAP can be used as a biomaterial and as ion exchangers, adsorbents and catalysts; however, one of the most effective uses of HAP is as a hybrid material with biopolymers [24,25], having, as an example, its joint use with collagen, chitosan and chitin, synthesized by various methods, including precipitation, electrochemical deposition and blending, i.e., a biomimetic process with simulation of the biological fluid [26][27][28][29][30][31][32][33]. These biopolymers end up inferring changes in the properties of HAP, particularly the dielectric, vibrational, morphological and optical properties [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Influence of Polymeric Blends on Bioceramics of Hydroxyapatite

Gomes,

Lima,

Gavinho

et al. 2023

Crystals

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Bioceramics are used to repair, rebuild, and replace parts of the human body, e.g., bones, joints and teeth, in the form of powder, coatings or prostheses. The synthetic hydroxyapatite [Ca10(PO4)6(OH)2 (HAP)] based on calcium phosphate has been widely used in the medical and dental areas due to the chemical similarity with the inorganic component of human bone tissue. In this work, hydroxyapatite nanocrystalline powders were synthesized by the solid-state reaction method and sintered with a galactomannan and chitosan blend. The bioceramics studied were prepared from 70%, 80% and 90% of hydroxyapatite with 30%, 20% and 10% of galactomannan and chitosan blends, respectively. The influence of the blend content on the bioceramics was investigated through structural, vibrational, thermal, morphological and dielectric characterizations. It was observed that the increase in the blend percentage promoted an increase in the grain size, which was followed by a decrease in the density and hardness of the samples. The sample with a higher amount of polymeric blend also presented a higher dielectric constant and higher losses.

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Influence of the polysaccharide galactomannan on the dielectrical characterization of hydroxyapatite ceramic

Cited by 8 publications

References 14 publications

Effect of sintering parameters on physical and mechanical properties of powder injection moulded stainless steel-hydroxyapatite composite

Effect of sintering parameters on physical and mechanical properties of powder injection moulded stainless steel-hydroxyapatite composite

Estudo comparativo da preparação e caracterização de cimentos à base de hidroxiapatita e galactomanana

Influence of Polymeric Blends on Bioceramics of Hydroxyapatite

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