Wyniki wyszukiwania - BazTech

1

Wpływ napełniacza mineralnego modyfikowanego związkami naturalnymi na właściwości przetwórcze i mechaniczne plastyfikowanego poli(chlorku winylu)

Altmajer Zuzanna, Wilczewski Sławomir, Osial Magdalena, Giersig Michael, Tomaszewska Jolanta

IPPT Reports on Fundamental Technological Research

|

2024

|

nr 2

9--25

PL

Poli(chlorek winylu) (PVC) jest jednym z najstarszych tworzyw termoplastycznych produkowanych na skalę przemysłową. Oprócz wielu korzystnych właściwości jedną z głównych zalet PVC jest jego podatność na fizyczną modyfikację, dzięki czemu wykorzystuje się go w różnych dziedzinach. W celu modyfikacji właściwości poli(chlorku winylu) stosuje się dodatki, m.in. smary, plastyfikatory, stabilizatory termiczne oraz napełniacze. W ramach niniejszej pracy zaproponowano zastosowanie hydroksyapatytu (HAp) jako napełniacza mineralnego do modyfikacji poli(chlorku winylu) pokrytego stabilizatorem roślinnym pochodzącym z kurkumy. Dodatkowo oceniono wpływ modyfikacji HAp za pomocą kurkuminy na strukturę oraz właściwości przetwórcze i fizykomechaniczne otrzymanych kompozytów. Uzyskane wyniki wykazały, że zastosowanie modyfikatora roślinnego zapobiega agregacji napełniacza. Jego dodatek do plastyfikowanej mieszanki PVC wpłynął na wydłużenie czasu stabilności termicznej oraz zmniejszenie masowego wskaźnika szybkości płynięcia. Stwierdzono ponadto istotny wpływ napełniacza na właściwości mechaniczne, tj. twardość, moduł sprężystości PVC oraz wytrzymałość na rozciąganie otrzymanych kompozytów.

EN

Poly(vinyl chloride) (PVC) is one of the oldest thermoplastics produced on an industrial scale. In addition to its many favorable properties, one of the main advantages of PVC is its susceptibility to various types of modification, which makes it exploited in many areas. Different types of additives such as lubricants, plasticizers, thermal stabilizers, and fillers are used to modify the properties of poly(vinyl chloride). Within the scope of this study, hydroxyapatite was proposed as a mineral filler based on the hydroxyapatite (HAp) modified with the green plant-derived coat for poly(vinyl chloride) modification. In addition, the effect of coat of hydroxyapatite with curcumin on the structure, as well as the processing properties and physicomechanical properties of the obtained composites. The obtained results showed that the use of a plant origin modifier influenced the reduction of filler particle size. Hydroxyapatite influenced an increase in thermal stability time and a decrease in mass flow rate. The mineral filler also affected the reduction of tensile strength. However, its significant effect on the hardness and elastic modulus of PVC was observed.

2

The Removal of Phenol Through Adsorption onto Synthetic Calcium Phosphates – A Study Encompassing Analyses of Kinetics and Thermodynamics

El Bakri Abdellatif, El Boujaady Hicham, Ferraa Nouhaila, Bennani-Ziatni Mounia

Ecological Engineering & Environmental Technology

|

2024

|

Vol. 25, iss. 4

301--315

EN

The characteristics and suitability of hydroxyapatite (HAP), tricalcium apatite phosphate (PTCa), and octocalcium apatite phosphate (OCPa), which possess similar attributes to those of an ideal adsorbent, were investigated to determine their efficacy in phenol removal. The aim of this paper is to assess the adsorption behavior of phenol on phosphates powders synthesized by the co-precipitation method at ambient temperature. Furthermore, the impact of initial phenol quantities and thermal conditions on the adsorption process was explored. X-ray diffraction analysis revealed the formation of HAP, PTCa, and OCPa structures under room temperature conditions. The sample morphologies were subjected to scrutiny utilizing MEB together with X-ray analysis. Additionally, chemical analysis revealed that Ca/P = 1.6, 1.5, and 1.33 for HAP, PTCa, and OCPa, respectively. The synthesized powders exhibited adsorption abilities of 2.86, 2.74, and 2.52 mg/g for HAP, PTCa, and OCPa, respectively, and reached equilibrium in approximately 80 minutes. The study revealed that the experimental data are appropriately represented by the Langmuir and Freundlich adsorption equations for HAP and PTCa, and Langmuir model in the case of OCPa, as well as by the pseudo-first-order and pseudo-second-order adsorption kinetics. Thermodynamic evaluations, including calculations of ΔG°, ΔH°, and ΔS°, were performed. The results indicated that the adsorption mechanisms exhibited physical characteristics, were thermally absorbing in the case of HAP and exothermic for the other two phosphates, PTCa and OCPa, and occurred spontaneously.

3

Synthesis and Characterization of Hydroxyapatite/Titania Composite and Its Application on Photocatalytic Degradation of Remazol Red B Textile Dye Under UV Irradiation

Sukarta I. Nyoman, Sastrawidana I. Dewa Ketut

Ecological Engineering & Environmental Technology

|

2024

|

Vol. 25, iss. 2

178--189

EN

This research was conducted to synthesize and characterize hydroxyapatite-titania (HA/TiO2) composites and test their photocatalytic degradation activity on the remazol red RB textile dye. The chemical precipitation method was utilized to produce hydroxyapatite (HA) based on the conversion of calcium carbonate presented in sea mussel shells into calcium oxide with a calcination temperature of 1000°C for 2 hours and then followed by the addition of phosphorous acid at pH medium of 11 and sintered at 700°C to obtain an HA crystal. The HA/TiO2 composite at variation weight of HA and TiO2 ratio were prepared with hydrothermal technique and characterized by the FTIR spectroscopy, X-ray diffraction, and scanning electron with energy dispersive X-ray spectroscopy. A total of 250 mL of 50 mg/L Remazol red RB dye solution was photocatalytically removed using a HA/TiO2 composite irradiated with 25 Watt UV light and using the adsorption method. Characterization results using FTIR, XRD, and SEM-EDX show that the synthesized hydroxyapatite (HA) has a degree of crystallinity of 68% with a Ca/P ratio of 1.66. The highest degradation efficiency of 250 mL of remazol red RB with a concentration of 50 mg/L was achieved at 94.22% in 2 hours of contact time by a photocatalysis treatment employing the HA/TiO2 composite at a ratio of 1:1 in comparison to only 92.23% removal by the HA adsorption process.

4

The Effects of the Polymers as a Sacrificed Material for the Hydroxyapatite Powder Synthesized by an Ultrasonic Spray Pyrolysis Process

Lee Jeongha, Lee Kun-Jae

Archives of Metallurgy and Materials

|

2024

|

Vol. 69, iss. 1

87--90

EN

The HAp (hydroxyapatite) excellent ion exchange resin and has adsorption properties of heavy metals and organic materials. It is used as an adsorption material and as an organic drug-delivery material due to these characteristics, that are essentially controlled the specific surface area. In this paper, the specific surface area was controlled by adding polymers of polyvinylpyrrolidone (PVP), polystyrene beads (PSB), and polyethylene glycol (PEG). Through the USP process, the HAp powder is able to synthesize into the spherical shape, specific surface area, and pore were controlled by the properties of the polymers.

5

Properties of biodegradable polymer coatings with hydroxyapatite on a titanium alloy substrate

Goldsztajn Karolina, Godzierz Marcin, Hercog Anna, Władowski Mariusz, Jaworska Joanna, Jelonek Katarzyna, Woźniak Anna, Kajzer Wojciech, Orłowska Ada, Szewczenko Janusz

Acta of Bioengineering and Biomechanics

|

2024

|

Vol. 26, no. 1

121--132

EN

Titanium alloys are among the most widely used materials in medicine, especially in orthopedics. However, their use requires the application of an appropriate surface modification method to improve their properties. Such methods include anodic oxidation and the application of polymer coatings, which limit the release of alloying element ions. In addition, biodegradable polymer coatings can serve as a carrier for drugs and other substances. The paper presents the results of research on the physical properties of biodegradable polymer coatings containing na-noparticle hydroxyapatite on a titanium alloy substrate. Methods: A PLGA coating was used in the tests. The coatings on the substrate of the anodized Ti6Al7Nb alloy were applied by ultrasonic spray coating. The tests were carried out for coatings with various hydroxyapatite content (5, 10, 15, 20%) and thickness resulting from the number of layers applied (5, 10, 15 layers). The scope of the research included microscopic observations using scanning electron microscopy, topography tests with optical profilometry, structural studies using X-ray diffraction, as well as wettability and adhesion tests. Results: The results shows that with the use of ultrasonic spray coating system is possible to obtain the continuous coatings containing hydroxyapaptite. Conclusions: The properties of the coating can be controlled by changing the percentage of hydroxyapatite and the number of layers of which the coating is composed.

6

Thermal treatment effect on the particle size distribution of alkaline earth metals hydroxyapatite

Diichuk Volodymyr, Diichuk Iryna

Scientiae Radices

|

2023

|

Vol. 2, Iss. 4

309--318

EN

Hydroxyapatites of certain alkaline earth metals were synthesised, and their phase composition was determined using X-ray phase analysis. Thermal modification of the studied compounds was performed at temperatures not exceeding 800°C. The laser diffraction method determined the size distribution of the samples subjected to thermal treatment. It was found that the mean particle size ranged from 5,48±1,28 to 126,71±3,68 μm. It has been demonstrated that particle aggregation and fragmentation processes are possible depending on the synthesised compounds' qualitative and quantitative phase composition and the modification temperature.

7

Polymer composites for obtaining human anatomic structures

Oleksy Małgorzata, Dynarowicz Klaudia, Aebisher David

Polimery

|

2023

|

Vol. 68, nr 6

323--329

EN

Composites based on PLA with the addition of 3, 6 and 10 wt% silica, hydroxyapatite and bentonite were obtained by twin-screw extrusion. Maleic anhydride grafted polyethylene was used to enhance interface interactions. The influence of the fillers used on the Charpy impact strength, Rockwell hardness, tensile properties and processing shrinkage was investigated. Test samples were obtained by 3D printing. The highest impact strength and hardness were obtained for the composite containing 10 wt% hydroxyapatite. PLA with 10 wt% hydroxyapatite and 3 wt% bentonite was used to obtain anatomical structures by 3D printing.

PL

Metodą dwuślimakowego wytłaczania otrzymano kompozyty na osnowie PLA z dodatkiem 3, 6 i 10% mas. krzemionki, hydroksyapatytu oraz bentonitu. W celu zwiększenia oddziaływań na granicy faz użyto polietylenu szczepionego bezwodnikiem maleinowym. Zbadano wpływ stosowanych napełniaczy na udarność Charpy’ego, twardość Rockwella, właściwości mechaniczne przy statycznym rozciąganiu oraz skurcz przetwórczy. Próbki do badań otrzymano za pomocą druku 3D. Największą udarność i twardość uzyskano w przypadku kompozytu zawierającego 10% mas. hydroksyapatytu. Do otrzymywania struktur anatomicznych metodą druku 3D zastosowano hybrydowy kompozyt PLA zawierający 10% mas. hydroksyapatytu i 3% mas. bentonitu.

8

Polymer and composite materials used in medicine – an overview

Oleksy Małgorzata, Dynarowicz Klaudia, Aebisher David

Polimery

|

2023

|

Vol. 68, nr 7-8

363--370

EN

The article is a review of the literature on the use of polymers in medicine as biomaterials. Examples of the preparation of the most commonly used synthetic polymers in medicine, such as: polylactide (PLA), polyglycolide (PGA), polyhydrobutyrate (PHB), polycaprolactone (PCL) are described. The characteristics of ceramic materials: hydroxyapatite (HAp) and tricalcium phosphate (TCP) are also presented in terms of the use of synthetic biodegradable polymers as biofillers. The last part of article is devoted to the functional properties of composites based on PLA with the addition of HAp and TCP.

PL

Artykuł stanowi przegląd literatury dotyczący zastosowania polimerów w medycynie jako biomateriałów. Opisano przykłady otrzymywania najczęściej stosowanych syntetycznych polimerów w medycynie takich jak: polilaktyd (PLA), poliglikolid (PGA), polihydromaślan (PHB), polikaprolakton (PCL). Przedstawiono także charakterystykę materiałów ceramicznych: hydroksyapatytu (HAp) i trójfosforanu wapnia (TCP) pod kontem stosowania jako bionapełniacze syntetycznych biodegradowalnych polimerów. Ostatnia część artykułu jest poświęcona właściwościom użytkowym kompozytów na osnowie PLA z dodatkiem HAp i TCP.

9

Zastosowania systemów uwalniania wankomycyny do regeneracji tkanki kostnej

Träger Dominika, Niziołek Karina

Inżynieria Materiałowa

|

2023

|

Vol. 44, nr 4

18--24

PL

Wankomycyna (VA) jest szeroko stosowanym glikopeptydowym antybiotykiem, o bardzo skutecznym działaniu bakteriobójczym/bakteriostatycznym. Jest stosowana profilaktycznie przed operacjami, po zabiegach lub w ich trakcie wraz z wszczepianym implantem celem zahamowania namnażania się bakterii i zapobiegania infekcji. Pomimo skutecznego działania bakteriobójczego, nieostrożne i niewłaściwe podanie antybiotyku może skutkować toksycznym działaniem prowadzącym do stałych uszkodzeń w ciele. W przeglądzie przedstawiono przykłady połączenia VA z implantami, które pozwalają na precyzyjne dostarczenie leku oraz kontrolę nad czasem jego uwalniania, wspomagając tym samym regenerację tkanki kostnej

EN

Vancomycin (VA) is a widely used glycopeptide antibiotic with highly effective bactericidal/bacteriostatic activity. It is used prophylactically before, after, or during surgery along with an implant to inhibit bacterial proliferation and prevent infection. Despite its effective antibacterial effect, careless and inappropriate administration of the antibiotic can result in toxicity leading to permanent damage in the body. The review provides examples of combining VA with implants that allow precise delivery of the drug and control over the timing of its release, thereby aiding bone tissue regeneration

10

Improvement of the mechanical properties of biphasic calcium phosphate ceramic composite using silicene

Abdulridha Nazar J., Al-Ghaban Ahmed M., Al-Obaidi Anwer J.

Engineering Transactions

|

2023

|

Vol. 71, iss. 2

185-195

EN

In light of recent events in the replacement and generation of human tissues, it is becoming extremely difficult to ignore the existence of bioceramics. Although hydroxyapatite and betatricalcium phosphate materials are frequently employed individually, they both lack certain qualities. As a result, combining hydroxyapatite and beta-tricalcium phosphate may result in the combination of their respective qualities. The current study aims to investigate the effect of using a novel nanostructure called silicene (silicon nanosheet-SiNS) on the mechanical properties of the composite ceramic (biphasic calcium p hosphate) at various ratios of hydroxyapatite and beta-tricalcium phosphate. The silicene has been synthesized and added at different weight percentages of 1, 3, and 5%. The results reveal that the compressive strength improved due to increasing the content of silicene. The average of increasing was between 58.6% and 142% because of the strong hexagonal structure of silicene. At the same time, the hardness of the biphasic calcium phosphate composite was enhanced by increasing the weight percentage of silicene. However, the hardness decreased when the content of silicene was more than 3% due to the presence of small cavities on the surface of the samples.

11

Characterization of Microwave Sintered Aluminium Composite Reinforced with Hydroxyapatite Extracted from Rihu Fish Scales

Venkatesh V.S.S., Prasad Kalapala, Deoghare Ashish B.

Archives of Metallurgy and Materials

|

2023

|

Vol. 68, iss. 2

617--624

EN

In this study, Hydroxyapatite (HAp) is extracted from the Rihu fish scales which are generally dumped as garbage. The aluminium composite was fabricated through the powder metallurgy technique by reinforcing HAp (0, 5, 10 and 15 wt%) as a reinforcement. The fabricated samples were sintered through microwave sintering at 530℃ for 15 min under an argon gas environment. The fabricated composites were subjected to X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analysis to confirm the constituting elements and to describe the reinforcement dispersion in the matrix. Uniform reinforcement dispersion was observed for the composite reinforces with 5% HAp, 10% HAp particles. The mechanical characterization results reveal that the Al-10% HAp composite exhibits a microhardness value of 123 ± 3 Hv and maximum ultimate tensile strength of 263 ± 10 MPa and 299 ± 9 MPa compression strength was obtained due to the presence of a strong bond among the aluminium and HAp particles.

12

Utilising cold sintering process for sintering hydroxyapatite-polyetheretherketone nanocomposite

Abbas H. O., Smeig H. A., Ameer Z. J. A.

Archives of Materials Science and Engineering

|

2023

|

Vol. 124, nr 1

25--41

EN

Purpose: A novel technique of very low-temperature sintering named the cold sintering process is used to produce Highly dense hydroxyapatite-polyetheretherketone (HA-PEEK) nanocomposites. The polymers and ceramics are sintered at different temperatures; therefore, it is difficult to create ceramic matrix composites using traditional methods because the high temperatures might damage the polymers. It is hard to concurrently treat polymeric materials at high temperatures because HA often sinters at temperatures exceeding 1000°C. So, the study aimed to use a novel low-temperature sintering named Cold Sintering Process (CSP) with a Ts/ Tm ratio greater than 0.2 to alleviate this issue. This method could offer a production path with quick densification and less energy costs to increase throughput. Design/methodology/approach: In the current work, two different routes are used: The direct mixing and dissolution methods were used for powder preparation to fabricate a unique ceramic matrix composite. The study aimed to determine whether the preparation method could produce two continuous phases for better densification. The sintering temperature, pressure, holding time, and PEEK content were selected as the production parameters. The samples are characterised using a scanning electron microscope (SEM), X-ray energy dispersive spectrometry (EDS), an X-ray diffractogram (XRD), and a transition electron microscope (TEM). Also, physical and mechanical property measurements were detected, including density, water contact angle, hardness, and diametral tensile strength (DTS). Findings: It can be observed that a high densification compact (relative density 99.3%) can be observed by using the dissolution method HA-PEEK composites, which can be produced via the cold sintering process. The dissolution method can produce two continuous phases compared with the direct mixing method. All samples exhibit excellent hydrophilicity, which makes them good candidates for biomedical applications. Research limitations/implications: The biggest implication of the cold sintering method is the difficulty of making large-sized and complex-shaped samples. Practical implications: The dissolution method can produce two continuous phases compared with the direct mixing method. All samples exhibit excellent hydrophilicity, which makes them good candidates for biomedical applications. Originality/value: A novel technique was used for the first time to solve the problem of producing ceramic matrix composites with polymer as the dispersion phase.

13

Wpływ procesu degradacji na właściwości fizykomechaniczne kompozytów PCL/HA

Antosik Agnieszka, Woźniak Anna, Najmrodzki Adrian, Tymowicz-Grzyb Paulina, Szterner Piotr, Kurzyk Agata, Biernat Monika

Szkło i Ceramika

|

2022

|

R. 73, nr 3

38--42

PL

Kompozyty na bazie polikaprolaktonu z dodatkiem wypełniacza w postaci włókien hydroksyapatytowych są jednym z potencjalnych materiałów do zastosowań inżynierii tkankowej. Materiały te odznaczają się nie tylko odpowiednią porowatością i wytrzymałością mechaniczną, lecz także bioaktywnością, biokompatybilnością i bioresorbowalnością. Z punktu widzenia możliwości aplikacyjnych danego materiału niezwykle istotna jest kontrola procesu degradacji kompozytu w czasie, tak aby rusztowanie mogło zapewnić stabilność mechaniczną do momentu odbudowy ubytku. W pracy przedstawiono wyniki badań dotyczące wpływu procesu degradacji na właściwości fizykomechaniczne opracowanych porowatych kompozytów na bazie polikaprolaktonu (PCL) z dodatkiem zsyntezowanych włókien hydroksyapatytu (HA) o zróżnicowanej morfologii. Szczególną uwagę zwrócono na wpływ zsyntezowanego proszku na zmianę właściwości fizykomechanicznych kompozytów w procesie degradacji. Próbki do badań otrzymano metodą liofilizacji. Proces degradacji badano poprzez pomiar ubytku masy, zmiany mikrostruktury, powierzchni właściwej, gęstości i wytrzymałości na ściskanie w czasie. Pomiary prowadzono po 3, 6 i 12 tygodniach inkubacji w soli fizjologicznej buforowanej fosforanem (PBS). Wyniki badań wykazały, że proces degradacji badanych kompozytów jest bardzo wolny, a dodatek zsyntezowanego HA nieznacznie go przyspiesza. Ubytek masy kompozytu po 12 tygodniach inkubacji w PBS wynosił zaledwie 0,47%. Procesowi degradacji towarzyszy spadek gęstości i wzrost powierzchni właściwej materiału w czasie. Porównanie wytrzymałości opracowanych kompozytów PCL/HA przed i po 12 tygodniach inkubacji w PBS, pozwala wnioskować, że dodatek zsyntezowanego hydroksyapatytu wpływa na wzrost wytrzymałości kompozytów w czasie (nawet do 20%).

EN

Polycaprolactone-based composites with filler in the form of hydroxyapatite fibers are one of the potential materials for tissue engineering applications. These materials are characterized not only by adequate porosity and mechanical strength, but also by bioactivity, biocompatibility and bioresorbability. From the point of view of the applicability of a given material, it is extremely important to control the degradation process of the composite over time, so that the scaffold can provide mechanical stability until the defect is restored. The paper presents the results of the study of the effect of the degradation process on the physicomechanical properties of the developed porous composites based on polycaprolactone (PCL) with the addition of synthesized hydroxyapatite (HA) fibers of different morphologies. In the study, special attention was paid to the effect of the synthesized powder on the change of physicomechanical properties of the composites during the degradation process. Samples for the study were obtained by freeze-drying method. The degradation process was studied by measuring weight loss, changes in microstructure, specific surface area, density and compressive strength over time. Measurements were conducted after 3, 6 and 12 weeks of incubation in PBS (phosphate-buffered saline). The results showed that the addition of synthesized HA slightly accelerates the degradation process of PCL/HA composites. Nevertheless, the degradation process is very slow. The weight loss of the composite after 12 weeks of incubation in PBS was only 0.47%. The degradation process is accompanied by a decrease in density and an increase in the specific surface area of the material over time. A comparison of the strength of the developed PCL/HA composites before and after 12 weeks of incubation in PBS, allows us to conclude that the addition of synthesized hydroxyapatite affects the increase in the strength of the composites over time (up to 20%).

14

Microplasma spraying of hydroxyapatite coatings on additive manufacturing titanium implants with trabecular structures

Kadyroldina Albina, Alontseva Dayra, Voinarovych Sergey, Łatka Leszek, Kyslytsia Oleksandr, Azamatov Bagdat, Khozhanov Aleksandr, Prokhorenkova Nadezhda, Zhilkashinova Almira, Burburska Svitlana

Materials Science Poland

|

2022

|

Vol. 40, No. 4

28--42

EN

This paper presents new results of microplasma spraying (MPS) of laboratory-synthesized hydroxyapatite (HA) powder coatings onto trabecular substrates obtained by selective laser melting (SLM) of a certified titanium medical alloy powder. The aim of the study was to establish the possibility of combining the technologies of MPS and additive manufacturing (AM) for the possible production of custom-designed implants with increased surface biocompatibility, as well as to establish the MPS parameters that ensure chemical purity of the HA coating and satisfactory adhesion of the coatings to the substrate. The structural-phase compositions of the initial HA powder and the plasma-sprayed HA coating were studied by X-ray diffraction analysis and transmission electron microscopy, and the adhesion strength of the coating was tested according to the F1147 standard of the American Society for Testing and Materials (ASTM). The main results of the study are the following: the application of the MPS technology for HA coating with an average thickness of 150±50 μm on trabecular substrates obtained by the SLM method has been shown. The parameters of MPS of HA coatings onto titanium implants with a trabecular surface have been established. It is also proved that using the appropriate MPS parameters, it is possible to obtain a HA coating with a 95% level of HA phases, 93% level of crystallinity, and the adhesion strength to the trabecular substrate of 24.7±5.7 MPa, which complies with the requirements of the international medical standard (International Organization for Standardization [ISO] 13779-2:2018). These results are of significance for a wide range of researchers developing plasma spray technologies for the manufacture of biocompatible coatings.

15

Structural and Morphological Evaluations of Natural Hydroxyapatite from Calcined Animal Bones for Biomedical Applications

Ojo Olusola Emmanuel, Sekunowo Olatunde Israel, Ilomuanya Margaret Okonawan, Gbenebor Oluwashina Philips, Adeosun Samson Oluropo

Journal of Casting & Materials Engineering

|

2022

|

Vol. 6, no. 1

14--21

EN

Several biomedical materials have been employed as drug delivery systems, but natural Hydroxyapatite (HAP) has been proven to be exceptionally better than other materials owing to its excellent bioactivity and biocompatibility properties. In this study, natural HAP was obtained from bovine and caprine bones and comparatively analysed for biomedical applications. The bones were hydrothermally treated, calcined in the temperature range of 700–1100°C, held for 2 hours in an electric furnace to remove the organic contents; milled, sifted with 150 μm mesh sieve and then characterized. It was revealed by Energy Dispersive X-Ray Spectroscopy (EDS) that the bovine and caprine bone samples calcined at 1000°C had calcium/phosphorus ratio (Ca/P) of 1.66 closest to the standard of 1.67. The bovine HAP showed the best crystallinity (86.23%) at 1000°C while caprine HAP had its highest (87.25%) at 1100°C. Fourier Transform Infrared Spectroscopy (FTIR) results revealed that the calcination temperature must be greater than 700°C to isolate high quality HAP. The Scanning Electron Microscopy (SEM) showed that the samples calcined at 800°C had the largest average particle size (85.34 μm) while porosity increases with calcination temperature in both samples. The HAP obtained at a calcination temperature of 1000°C proved to have the best quality for biomedical applications.

16

HA-ZnO-Fe3O4 composite manufactured by wet powder metallurgy process for implant applications

Gupta Ruchi, Agarwal Mayank, Singh Vinay Pratap

Composites Theory and Practice

|

2022

|

R. 22, nr 1

40--43

EN

A hydroxyapatite (HA) based biocompatible and bioactive composite is an appropriate choice for bio-implants. This experimental work presents the influence of ZnO and Fe3O4 on the microstructure of HA-ZnO-Fe3O4 composites synthesized by the wet powder metallurgy process. These composites were characterized using SEM, energy-dispersive X-ray spectroscopy (EDS), and XRD. The obtained results showed the effect of the addition of Fe3O4 on the interface formation, which is exhibited by interconnected pores and sintered neck in the micrographs. The observed porosity helps to enhance the required osseointegration for the fixation of implants with human bones.

17

Some Aspects Concerning Titanium Coverage with Hydroxyapatite

Perju Manuela-Cristina, Nejneru Carmen, Vizureanu Petrica, Aelenei Andra-Adorata, Sandu Andrei Victor, Sachelarie Liliana, Nabiałek Marcin

Archives of Metallurgy and Materials

|

2022

|

Vol. 67, iss. 2

521--527

EN

Generally, the metallic implants do not exhibit any bio-integration properties in contact with bone tissues. To improve the interfacial properties of metallic implants in contact with bone, the coatings with thin biocompatible films are used. Two methods to coating titanium implants with hydroxyapatite are described. The first is a two phase method, where by cathodic polarization is deposed a monetite film followed by an alkaline treatment when the monetite is converted to hydroxyapatite. The second method is a biomimetic deposition on an alkaline activate titanium surface, using a five time more concentrated simulated body fluid (5xSBF). After deposition this samples was drying at 120℃ and was sintered at 700℃ for three hours. Optical microscopy, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Energy-dispersive X-ray (EDX) were used to characterize structure, morphology and compositions of the deposed films. In this study, electrochemical deposition and biomimetic deposition of hydroxyapatite are compared.

18

Synthesis of functionalized HAp-surface on β-Ti alloy using ball-burnishing assisted EDC process for biomedical application

Prakash Chander, Kotecha Ketan, Pramanik Alokesh, Basak Animesh, Shankar S.

Archives of Civil and Mechanical Engineering

|

2022

|

Vol. 22, no. 4

art. no. e192, 2022

EN

The current research develops functionalized biocompatible hydroxyapatite (HAp)-rich surface on TNTZ alloy using a novel ball-burnishing assisted electric discharge cladding (BB-EDC) has been presented. The biomechanical properties of HAp-layer, such as mechanical properties, fatigue performance, in-vitro corrosion resistance, and bioactivity, have been investigated. The results showed that EDC-modified surfaces comprised discharge craters, globules, splats structures, and high ridges of redeposited metal. However, the BB-EDC process produced a relatively flat, smooth, dense surface with an average roughness value of 0.75 µm. The HAp-cladded layer by EDC and BB-EDC process featured an irregular surface range 25–30 µm thick and compact layer ranging 5–7 µm thick, respectively. The ball burnishing subjected caused plastic deformation on the developed layer that produced fine microstructure that increased surface hardness from 2.8 to 8.7 GPa. The functional HAp-cladded layer obtained by BB-EDC exhibit excellent corrosion properties. The dense and compact layer comprised a deformed microstructure with high residual stresses that offered high resistance to crack imitation propagation, thus resulting in better fatigue performance of β-phase TNTZ alloy. Furthermore, in-vitro bioactivity results showed that BB-EDC modified exhibit anti-inflammatory surface and promoted cell growth. The findings of the current research work offer up new possibilities for biomedical, automobile and aerospace industries to utilize the potential of BB-EDC as a new surface engineering technology to develop functionalized surfaces with improved surface characteristics and mechanical properties.

19

Adsorpcja dwuwartościowych kationów na granicy faz hydroksyapatyt/roztwór elektrolitu

Janusz Władysław, Skwarek Ewa

Wiadomości Chemiczne

|

2021

|

[Z] 75, 9-10

1203--1228

EN

Functional and composite materials obtained from hydroxyapatite (HAp) are widely used in practice, which results in intensive research of systems containing hydroxyapatite. Doping with divalent ions of hydroxyapatite changes its properties, thus extending its application in material science. Substitution of calcium ions in the surface layer of hydroxyapatite by metal cations is used in the development of new catalysts, sorbents, sensors and materials for other applications. The doping of the surface of the hydroxyapatite with divalent ions may occur as a result of adsorption of metal cations on the surface groups and calcium exchange in the crystal structure of the hydroxyapatite. The paper presents the mechanisms of adsorption of selected bivalent ions Ba2+, Cd2+, Co2+, Fe2+, Sr2+, Zn2+ on hydroxyapatite. The influence of cation adsorption on unit cell parameters, crystallite size and particle size distribution is discussed.

20

Kompozyty polilaktydowe z wypełniaczem bioceramicznym

Szabłowska Agnieszka

Szkło i Ceramika

|

2021

|

R. 72, nr 1

19--21

PL

Materiały na bazie polilaktydu są perspektywicznymi surowcami do wytwarzania substytutów kości. Stale poszukuje się nowych rozwiązań poprawiających ich właściwości mechaniczne. Obiecującym kierunkiem jest wprowadzenie bioaktywnej ceramiki, która nie tylko wpłynie na poprawę właściwości, lecz również na biokompatybilność materiału.

XX

The polylactide-based materials are prospective raw materials for the production of bone substitutes. New solutions to improve their mechanical properties are constantly being sought. A promising direction is the implementation bioactive ceramics, which will not only improve properties, but also could improve the biocompatibility of the material.