Biomaterial

دسترسی آزاد مقاله

1 - From egg shell wastes (ESWs) into advanced materials: A rapid and simple synthesis of CaO/Ca2Fe2O5 as a novel nanocomposite-derived ESW biomaterial
Asadollah Hassankhani

AbstractESW as a natural byproduct, although non-hazardous and contains calcium, magnesium carbonate and protein, is commonly disposed in landfills without any pretreatment because it was traditionally useless. In this regards, we wish to report the synthesis of a novel چکیده کامل

AbstractESW as a natural byproduct, although non-hazardous and contains calcium, magnesium carbonate and protein, is commonly disposed in landfills without any pretreatment because it was traditionally useless. In this regards, we wish to report the synthesis of a novel CaO/Ca2Fe2O5 nanocomposite based on ESW. At the first, eggshell (ES) nanopowder was prepared by ball-milling. Then, the CaO/Ca2Fe2O5 nanocomposite as a novel and heterogeneous nanomaterial was synthesized by simply adding an aqueous solution of FeSO4 on the ES nanopowder. After coating the FeSO4 on the surface of the ES powder, the precipitate was collected and calcinated. The synthesized nanocomposite was fully characterized by FTIR, FESEM, TEM, TGA, EDX and XRD analysis. The result was shown that the porous structure of the ESW as a cheap and biomaterial source of Ca was provided good contact area for growing the Fe nanoparticles. The suggested strategy for the synthesis of CaO/Ca2Fe2O5 nanocomposite is very interesting due to use of green and low cost starting materials and its simple and clean preparation procedure. The present procedure was successfully provided a useful application of ESW from the environment to synthesis the novel nanomaterials. پرونده مقاله

دسترسی آزاد مقاله

2 - Fabrication, Characterization and Osteoblast Response of Cobalt-Based Alloy/Nano Bioactive Glass Composites
Mohammad Reza Bafandeh Raziyeh Gharahkhani Mohammad Hossein Fathi

IIn this work, cobalt-based alloy/ nano bioactive glass (NBG) composites with 10, 15 and 20 wt% NBG were prepared and their bioactivity after immersion in simulated body fluid (SBF) for 1 to 4 weeks was studied. The scanning electron microscopy images of two- step sinte چکیده کامل

IIn this work, cobalt-based alloy/ nano bioactive glass (NBG) composites with 10, 15 and 20 wt% NBG were prepared and their bioactivity after immersion in simulated body fluid (SBF) for 1 to 4 weeks was studied. The scanning electron microscopy images of two- step sintered composites revealed a relatively dense microstructure the density of which decreased with the increase in the NBG amount. Microstructural analysis as well as energy dispersive X-ray analysis (EDX) revealed that after 1 week of immersion in SBF, a small amount of calcium phosphate phases precipitates on the surface of the composite samples. After 2 weeks of immersion, a considerable amount of cauliflower-like shaped precipitations was observed on the surface of composites. The observed peaks in the Fourier transform infrared (FTIR) spectroscopy of the composite samples in SBF immersed for 4 weeks were assigned to hydroxyapatite. Therefore, a hydroxyapatite layer has been possibly formed on the surface of the composite samples during immersion in SBF. Cell culture results indicate that unlike the Co-based alloy, the Co-based/NBG composites are bioactive and bone cells could be vivid and grow on their surfaces, promising their possibility for implant applications. پرونده مقاله

دسترسی آزاد مقاله

3 - Interval MULTIMOORA method with target values of attributes based on interval distance and preference degree: biomaterials selection
Arian Hafezalkotob Ashkan Hafezalkotob

A target-based MADM method covers beneficial and non-beneficial attributes besides target values for some attributes. Such techniques are considered as the comprehensive forms of MADM approaches. Target-based MADM methods can also be used in traditional decision-making چکیده کامل

A target-based MADM method covers beneficial and non-beneficial attributes besides target values for some attributes. Such techniques are considered as the comprehensive forms of MADM approaches. Target-based MADM methods can also be used in traditional decision-making problems in which beneficial and non-beneficial attributes only exist. In many practical selection problems, some attributes have given target values. The values of decision matrix and target-based attributes can be provided as intervals in some of such problems. Some target-based decision-making methods have recently been developed; however, a research gap exists in the area of MADM techniques with target-based attributes under uncertainty of information. We extend the MULTIMOORA method for solving practical material selection problems in which material properties and their target values are given as interval numbers. We employ various concepts of interval computations to reduce degeneration of uncertain data. In this regard, we use interval arithmetic and introduce innovative formula for interval distance of interval numbers to create interval target-based normalization technique. Furthermore, we use a pairwise preference matrix based on the concept of degree of preference of interval numbers to calculate the maximum, minimum, and ranking of these numbers. Two decision-making problems regarding biomaterials selection of hip and knee prostheses are discussed. Preference degree-based ranking lists for subordinate parts of the extended MULTIMOORA method are generated by calculating the relative degrees of preference for the arranged assessment values of the biomaterials. The resultant rankings for the problem are compared with the outcomes of other target-based models in the literature. پرونده مقاله

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4 - Modification of Bacterial Cellulose Rehydration via Cross-linking with Succinic Acid
امین مفتاحی مهشاد سعادت کاشف صابری سمیه علی بخشی

Bacterial cellulose (BC) is a significant biopolymer in medical applications and some research has been conducted to modify its rehydration ability. In this research bacterial cellulose was cross-linked with succinic acid (SA)/ Sodium hypophosphate (SHP) in different co چکیده کامل

Bacterial cellulose (BC) is a significant biopolymer in medical applications and some research has been conducted to modify its rehydration ability. In this research bacterial cellulose was cross-linked with succinic acid (SA)/ Sodium hypophosphate (SHP) in different concentrations and then the wettability of treated and untreated BC was investigated. SEM and BET proved a new structural construction and higher porosity in the cross-linked BC. Additionally, ATR-FTIR showed the presence of ester bonds (COO) in the treated samples. Moreover, the thickness and water absorption were enhanced by 137% and 133% respectively and the cross-linked samples showed a higher water swelling rate. Therefore, cross-linked BC with succinic acid has a high potential for increasing BC shelf lifetime for biomedical applications. پرونده مقاله

دسترسی آزاد مقاله

5 - بررسی تأثیر سرعت سرد شدن بر ریزساختار و رفتار خوردگی آلیاژ Mg-5Zn-1Y-0.1Ca در محیط شبیه‌سازی شده بدن
حسن جعفری سعیده نقدعلی

در پژوهش حاضر به بررسی تاثیر سرعت سرد شدن بر ریزساختار و رفتار خوردگی آلیاژ Mg-5Zn-1Y-0.1Ca پرداخته شده است. مطالعه ریزساختار توسط میکروسکوپ‌های نوری و الکترونی روبشی نشان داد که ریزساختار زمینه آلیاژ، متشکل از دانه‌های α-Mg، و رسوبات Mg3YZn6 و Ca2Mg6Zn3 با مورفول چکیده کامل

در پژوهش حاضر به بررسی تاثیر سرعت سرد شدن بر ریزساختار و رفتار خوردگی آلیاژ Mg-5Zn-1Y-0.1Ca پرداخته شده است. مطالعه ریزساختار توسط میکروسکوپ‌های نوری و الکترونی روبشی نشان داد که ریزساختار زمینه آلیاژ، متشکل از دانه‌های α-Mg، و رسوبات Mg3YZn6 و Ca2Mg6Zn3 با مورفولوژی لایه‌ای که اغلب در مرز دانه‌ها تجمع یافته‌اند تشکیل شده‌اند. بعلاوه تصاویر بدست آمده از ریزساختار نشان دادند که با افزایش سرعت سرد شدن، پیوستگی رسوبات در مرزهای دانه و مناطق بین دندریتی افزایش می‌یابد. آزمایشات پولاریزاسیون و غوطه‌وری نشان دادند که همواره افزایش سرعت سرد شدن، باعث بهبود خواص خوردگی نخواهد شد و به نظر می‌رسد مقدار بهینه‌ای در سرعت سرد شدن وجود دارد که در آن، سرعت خوردگی کمینه خود را دارد. پرونده مقاله

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6 - Advancing biomedical, food, and industrial applications through carbon nanomaterials: current status and future perspectives
A. Abdollahpour Ayda Ranjbar Azadeh Asefnejad Bahareh Kamyab Moghadas Yashar Ghaffari David Otasowie Ogbemudia Mehid Taheri

Carbon nanomaterials, such as carbon nanotubes (CNTs) and graphene, possess remarkable mechanical, electrical, and biological properties, making them promising enhancers in biological materials. Their nanoscale dimensions and large surface area enable targeted interacti چکیده کامل

Carbon nanomaterials, such as carbon nanotubes (CNTs) and graphene, possess remarkable mechanical, electrical, and biological properties, making them promising enhancers in biological materials. Their nanoscale dimensions and large surface area enable targeted interactions with living organisms. However, concerns regarding their cellular compatibility in clinical orthopedic applications persist. To address this, ongoing investigations are examining the interaction of carbon nanomaterials with biological systems, including proteins, nucleic acids, and human cells, to assess their behavior in laboratory and in vivo settings. Studies have demonstrated that composites reinforced with CNTs and graphene enhance the adhesion of osteoblast cells, leading to enhanced bone tissue formation. This potential is expected to drive advancements in reconstructive medicine and bone tissue engineering. Additionally, this article presents current advancements and future research directions in developing CNT and graphene-reinforced implants for bone tissue engineering. پرونده مقاله

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