Mechanical behaviors and porosity of porous Ti prepared with large-size acicular urea as spacer

Qiu, Guibao; Wang, Jian; Cui, Hao; Lu, Tiecheng

doi:10.1007/s42452-018-0126-4

Cited by 5 publications

(7 citation statements)

References 39 publications

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“…This is because the hydrogels swell more in water as the urea content rises, resulting in them becoming highly porous. 25,44 The mechanism responsible is osmotic swelling. An osmotic pressure differential between the hydrogel and surrounding water is produced when urea is present in the hydrogel.…”

Section: Porosity Of Beadsmentioning

confidence: 99%

Controlled release of urea using negatively charged polysaccharides

John Kennedy,

Muthuramalingam,

Balasubramanian

et al. 2024

Polymers for Advanced Techs

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The current study aims to synthesize cross‐linked alginate–gum arabic, a polysaccharide biopolymer composite, to evaluate its efficacy for the controlled release of urea. The alginate–gum arabic solution was prepared in a 2:1 ratio, and urea was entrapped in three different amounts: 50 mg for SG1, 100 mg for SG2, and 150 mg for SG3. CaCl2 used as the crosslinker, and the urea‐entrapped alginate–gum arabic hydrogel beads were produced using ionotropic gelation method. Produced beads were underwent physical evaluation to analyze their size, porosity, and swelling behavior. The highest diameter was exhibited in SG3 at 3.60 ± 0.01 mm. Additionally, the highest porosity was observed in SG3 beads, measuring 63.6% ± 0.33%. The release of urea was quantified using the DiacetylMonoxim (DAM)–UV visible spectroscopy method. Further, the characterization of the produced hydrogel beads was analyzed using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetric analyses (TGA). FTIR revealed the characteristic band at 3770 and 2355 cm−1, indicating the presence of urea entrapped in alginate—gum arabic beads. TGA analyses indicates that the good thermal stability of the produced beads.

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Section: Porosity Of Beadsmentioning

confidence: 99%

Controlled release of urea using negatively charged polysaccharides

John Kennedy,

Muthuramalingam,

Balasubramanian

et al. 2024

Polymers for Advanced Techs

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“…Properly understanding the above-mentioned parameters enables fabricating porous Mg scaffolds with controlled degradation rates. It is well established that corrosion resistance of the porous scaffold exhibits a negative correlation with its porosity. − Addition of space holder materials in the Mg scaffold increases its porosity. ,, The Mg scaffold containing higher porosity degrades at a faster rate because of more contact area, which eventually provides accelerated transportation of the immersion medium . In addition, the chemical reaction between the scaffold and immersion medium also increases.…”

Section: Corrosion Behaviors Of Mg Scaffoldsmentioning

confidence: 99%

“…100−102 Addition of space holder materials in the Mg scaffold increases its porosity. 13,103,104 The Mg scaffold containing higher porosity degrades at a faster rate because of more contact area, which eventually provides accelerated transportation of the immersion medium. 46 In addition, the chemical reaction between the scaffold and immersion medium also increases.…”

Section: Corrosion Behaviors Of Mg Scaffoldsmentioning

confidence: 99%

Recent Developments in Engineered Magnesium Scaffolds for Bone Tissue Engineering

Dutta

Roy

2023

ACS Biomater. Sci. Eng.

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Significant attention has been drawn in recent years to develop porous scaffolds for tissue engineering. In general, porous scaffolds are used for non-load bearing applications. However, various metallic scaffolds have been investigated extensively for hard tissue repair due to their favorable mechanical and biological properties. Stainless steel (316L) and titanium (Ti) alloys are the most commonly used material for metallic scaffolds. Although stainless steel and Ti alloys are employed as scaffold materials, it might result in complications such as stress shielding, local irritation, interference with radiography, etc. related to the permanent implants. To address the above-mentioned complications, degradable metallic scaffolds have emerged as a next generation material. Among the all metallic degradable scaffold materials, magnesium (Mg) based material has gained significant attention owing to its advantageous mechanical properties and excellent biocompatibility in a physiological environment. Therefore, Mg based materials can be projected as load bearing degradable scaffolds, which can provide structural support toward the defected hard tissue during the healing period. Moreover, advanced manufacturing techniques such as solvent cast 3D printing, negative salt pattern molding, laser perforation, and surface modifications can make Mg based scaffolds promising for hard tissue repair. In this article, we focus on the advanced fabrication techniques which can tune the porosity of the degradable Mg based scaffold favorably and improve its biocompatibility.

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“…In the space-holder technique, a temporary material is added into the mixture of titanium alloy, which will be further removed through the thermal process or the dissolution process. The commonly used space-holder are NaCl 19,20 , ammonium bicarbonate (NH 4 HCO 3 ) 21,22 , carbamide 23,24 , Mg 25 , or even saccharose 26 .…”

Section: Introductionmentioning

confidence: 99%

Processing and Characterization of Porous Titanium for Orthopedic Implant Prepared by Argon-atmospheric Sintering and Arc Plasma Sintering

et al. 2021

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Porous titanium is proposed to be an effective orthopedic implant with a lower elastic modulus and supports osseointegration during implantation. To produce porous titanium, powder metallurgy (PM) assisted with a space-holder is used in this study. Pure titanium is used as the starting material, and salt (NaCl) is used as the space-holder. Argon-atmospheric sintering and arc plasma sintering (APS) methods are applied for the sintering process. NaCl content was varied from 0-40 wt%. The temperature sintering was at 1100 °C for the argon-atmospheric sintering, and the current process was at 75 A for the APS. The formation of pores, total porosity, pore distribution, phase formation, and mechanical properties were examined by the optical microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), and compression testing. Titanium with the addition of 20 wt% of NaCl is shown to be a potential biomaterial for the orthopedic implant, having a porosity of 38-39%, the elastic modulus of 3.2-5 GPa, and the yield strength of 141-150 MPa (argon-atmospheric sintering and APS) which shown to be similar to the properties of cortical bone.

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Mechanical behaviors and porosity of porous Ti prepared with large-size acicular urea as spacer

Cited by 5 publications

References 39 publications

Controlled release of urea using negatively charged polysaccharides

Controlled release of urea using negatively charged polysaccharides

Recent Developments in Engineered Magnesium Scaffolds for Bone Tissue Engineering

Processing and Characterization of Porous Titanium for Orthopedic Implant Prepared by Argon-atmospheric Sintering and Arc Plasma Sintering

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