Biocompatibility and Mechanical Performance of Ni-Ti

Biomimetic apatite deposition behaviors and mechanical performance for as-rolled and annealed Ni-Ti plates were investigated. Apatite nucleation and growth on Ni-Ti in SBF (simulated body fluid) was not appreciably influenced by heat treatment. But, the apatite deposition rate increased slightly by NaOH surface treatment. The nodular apatite on the deposited layer is favored on a macro-scale since the surface energy of polycrystalline apatite particles can be reduced by forming nodules. The weight gain after apatite deposition for Ni-Ti (0.004 g/cm2) after 10 days were found to be smaller that that of NaOH treated Ti-6Al-4V, but it was comparable to that of non- NaOH-treated Ti-6Al-4V (0.004 g/cm2). The stress-strain responses of annealed Ni-Ti displayed the pseudoelastic behavior associated with stress-induced martensite formation with the transition stress for the martensite formation equal to 320 MPa. On the other hand the cold worked Ni-Ti displayed no appreciable pseudoelastic region and the yield stress was ~500MPa. A good biomimetic apatite formation and excellent mechanical performance of Ni-Ti suggests that Ni-Ti can be an excellent candidate material for orthopedic implants.

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Apatite Deposition on Organic-Inorganic Hybrids Synthesized from Poly(Vinyl Alcohol) and Various Metal Oxides

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.284-286.469 ◽

2005 ◽

Vol 284-286 ◽

pp. 469-472 ◽

Cited By ~ 1

Author(s):

Caihong You ◽

Toshiki Miyazaki ◽

Eiichi Ishida ◽

Masahiro Ashizuka ◽

Chikara Ohtsuki ◽

...

Keyword(s):

Metal Oxides ◽

Vinyl Alcohol ◽

Calcium Salt ◽

Mechanical Performance ◽

Bone Substitutes ◽

Poly Vinyl Alcohol ◽

Apatite Formation ◽

Molybdenum Oxides ◽

Apatite Deposition

Organic polymers with ability of apatite formation in body environment are expected as novel bone substitutes having not only bone-bonding ability, i.e. bioactivity, but also mechanical performance analogous to natural bone. Several metal oxides have been found to be effective for the apatite deposition in body environment. In addition, release of calcium ions from the materials significantly enhances it. In this study, we attempted to synthesize bioactive organic-inorganic hybrids from Poly(vinyl alcohol) (PVA) by incorporation of various metal oxides and calcium salt. Silica and molybdenum oxides were selected as metal oxides. Ability of apatite formation on the hybrids was examined in vitro using simulated body fluid (SBF, Kokubo solution). Apatite deposition were observed to occur on the surfaces of PVA/silica and PVA/molybdenum oxide hybrids in SBF, when their compositions were appropriately controlled.

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Bioactive Organic-Inorganic Hybrids Prepared from Poly(Vinyl Alcohol) via Modification with Metal Oxides and Calcium Salt

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.309-311.1153 ◽

2006 ◽

Vol 309-311 ◽

pp. 1153-1156 ◽

Cited By ~ 3

Author(s):

Caihong You ◽

Toshiki Miyazaki ◽

Eiichi Ishida ◽

Masahiro Ashizuka ◽

Chikara Ohtsuki

Keyword(s):

Metal Oxides ◽

Titanium Oxide ◽

Vinyl Alcohol ◽

Calcium Salt ◽

Mechanical Performance ◽

Bone Substitutes ◽

Poly Vinyl Alcohol ◽

Apatite Formation ◽

Apatite Deposition

Organic polymers with ability of apatite formation in body environment are expected as novel bone substitutes having not only bone-bonding ability, i.e. bioactivity, but also mechanical performance analogous to natural bone. Several metal oxides have been found to be effective for the apatite deposition in body environment. In addition, release of calcium ions from the materials significantly enhances it. In this study, we attempted to synthesize bioactive organic-inorganic hybrids from poly(vinyl alcohol) (PVA) by incorporation of titanium oxide or zirconium oxide as well as calcium salt. Ability of apatite formation on the hybrids was examined in vitro using simulated body fluid (SBF, Kokubo solution). Apatite deposition was observed to occur on the surfaces of PVA/titanium oxide hybrids in SBF, when their compositions were appropriately controlled.

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Quantifying High-Performance Material Microstructure Using Nanomechanical Tools with Visual and Frequency Analysis

Scanning ◽

10.1155/2018/4975317 ◽

2018 ◽

Vol 2018 ◽

pp. 1-12 ◽

Cited By ~ 5

Author(s):

Emil Sandoz-Rosado ◽

Michael R. Roenbeck ◽

Kenneth E. Strawhecker

Keyword(s):

Mechanical Properties ◽

Frequency Analysis ◽

Visual Processing ◽

High Performance ◽

Mechanical Performance ◽

Structure Property ◽

Spatially Resolved ◽

Macro Scale ◽

Organization Strategy ◽

Stiffness Scanning

High-performance materials like ballistic fibers have remarkable mechanical properties owing to specific patterns of organization ranging from the molecular scale, to the micro scale and macro scale. Understanding these strategies for material organization is critical to improving the mechanical properties of these high-performance materials. In this work, atomic force microscopy (AFM) was used to detect changes in material composition at an extremely high resolution with transverse-stiffness scanning. New methods for direct quantification of material morphology were developed, and applied as an example to these AFM scans, although these methods can be applied to any spatially-resolved scans. These techniques were used to delineate between subtle morphological differences in commercial ultra-high-molecular-weight polyethylene (UHMWPE) fibers that have different processing conditions and mechanical properties as well as quantify morphology in commercial Kevlar®, a high-performance material with an entirely different organization strategy. Both frequency analysis and visual processing methods were used to systematically quantify the microstructure of the fiber samples in this study. These techniques are the first step in establishing structure-property relationships that can be used to inform synthesis and processing techniques to achieve desired morphologies, and thus superior mechanical performance.

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Apatite Deposition on Polypeptides Derived from Plants in a Solution Mimicking Body Fluid

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.309-311.671 ◽

2006 ◽

Vol 309-311 ◽

pp. 671-674

Author(s):

Toshiki Miyazaki ◽

Chikara Ohtsuki ◽

Shinichi Ogata ◽

Masahiro Ashizuka

Keyword(s):

Simulated Body Fluid ◽

Body Fluid ◽

Mechanical Performance ◽

Extracellular Fluid ◽

Organic Polymer ◽

Carboxyl Groups ◽

Organic Substrates ◽

Ion Concentrations ◽

Inorganic Ion ◽

Apatite Deposition

Organic-inorganic hybrids composed of organic polymer and apatite is quite attractive as novel bone-repairing materials since it has mechanical performance analogous to those of natural bone as well as bone-bonding ability, i.e. bioactivity. To fabricate such an apatite-polymer hybrid, biomimetic process has been recently paid much attention. In this process, bone-like apatite is deposited on the surfaces of organic substrates in simulated body fluid (SBF, Kokubo solution) having ion concentrations analogous to those of human extracellular fluid or more concentrated solutions. Previous studies showed that the apatite deposition is triggered by a catalytic effect of carboxyl groups (COOH) on the surfaces of the organic substrates. In this study, we examined apatite deposition on natural polypeptides derived from crops in a biomimetic solution. We selected gluten derived from wheat and zein derived from corn. Both of gluten and zein formed bone-like apatite on their surfaces in a solution that has inorganic ion concentrations 1.5 times those of simulated body fluid, when they were treated with 1 mol/L calcium chloride solution. High content of acidic amino acids such as glutamic acid and aspartic acid in gluten and zein would give large amount of carboxyl groups effective for the apatite nucleation.

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Biomimetic apatite formation on a CoCrMo alloy by using wollastonite, bioactive glass or hydroxyapatite

Journal of Materials Science ◽

10.1007/s10853-005-2856-0 ◽

2005 ◽

Vol 40 (13) ◽

pp. 3509-3515 ◽

Cited By ~ 17

Author(s):

D. A. Cortés ◽

A. Medina ◽

S. Escobedo ◽

M. A. López

Keyword(s):

Bioactive Glass ◽

Apatite Formation ◽

Cocrmo Alloy ◽

Biomimetic Apatite

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UV photofunctionalization promotes nano-biomimetic apatite deposition on titanium

International Journal of Nanomedicine ◽

10.2147/ijn.s95249 ◽

2016 ◽

pp. 223 ◽

Cited By ~ 4

Author(s):

Takahiro Ogawa ◽

Makiko Saita ◽

Takayuki Ikeda ◽

Masahiro Yamada ◽

Katsuhiko Kimoto ◽

...

Keyword(s):

Biomimetic Apatite ◽

Apatite Deposition

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Finite Elements Modeling of Mechanical and Acoustic Properties of a Ceramic Metamaterial Assembled by Robocasting

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.821.364 ◽

2016 ◽

Vol 821 ◽

pp. 364-371 ◽

Cited By ~ 3

Author(s):

Alena Kruisová ◽

Hanuš Seiner ◽

Petr Sedlák ◽

Michal Landa ◽

Benito Román-Manso ◽

...

Keyword(s):

Silicon Carbide ◽

Failure Modes ◽

Mechanical Performance ◽

Acoustic Properties ◽

Stress Concentrations ◽

Micro Scale ◽

Contact Points ◽

Finite Elements Modeling ◽

Macro Scale ◽

Anisotropic Elastic

Finite element modeling (FEM) was used for numerical simulations of mechanical performance of aperiodic silicon-carbide scaffold manufactured by robocasting. The FEM approach enabled reliable calculation of theeffective anisotropic elastic properties of the scaffold at the macro-scale, as well as of the acoustic band structureindicating the metamaterial-like behavior of the material at the micro-scale. In addition, the micromechanics of thescaffold was discussed based on the outputs of the model: the mechanisms of the extremely soft shearing modes wereidentified and the corresponding stress concentrations arising at the contact points in the scaffold were analyzedwith respect to the possible failure modes of the robocast structure.

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Biomimetic apatite formation on poly(lactic acid) composites containing calcium carbonates

Journal of Materials Research ◽

10.1557/jmr.2002.0104 ◽

2002 ◽

Vol 17 (4) ◽

pp. 727-730 ◽

Cited By ~ 31

Author(s):

Hirotaka Maeda ◽

Toshihiro Kasuga ◽

Masayuki Nogami ◽

Yoshitaka Hibino ◽

Ken-Ichiro Hata ◽

...

Keyword(s):

Lactic Acid ◽

Magic Angle Spinning ◽

Poly Lactic Acid ◽

Magic Angle ◽

Apatite Formation ◽

Composite Surface ◽

Calcium Carbonates ◽

Carbonation Process ◽

Biomimetic Apatite ◽

Angle Spinning

Poly(lactic acid) composites containing a mixture of calcium carbonates (vaterite, aragonite, and calcite) were prepared by a carbonation process in methanol. Soaking of the composites for 3 h in simulated body fluid (SBF) at 37 °C resulted in the deposition of bonelike apatite particles on the composite surface. After soaking the composites, vaterite phase in the composites was forward to dissolve rapidly, resulting in increase the supersaturation of the apatite in SBF. 13C cross-polarization magic angle spinning nuclear magnetic resonance (13C CP/MAS-NMR) spectra of the composites suggested the formation of a bond between Ca2+ ion and the COO- group, which induces the apatite nucleation. These results may elucidate the mechanism of means to reduce the induction period for apatite formation.

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