scholarly journals Influence of Dopant Nature on Biological Properties of ZnO Thin-Film Coatings on Ti Alloy Substrate

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 129 ◽  
Author(s):  
Stefania Stoleriu ◽  
Codruta Lungu ◽  
Cristina Daniela Ghitulica ◽  
Adrian Surdu ◽  
Georgeta Voicu ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Biological Response ◽  
Biological Properties ◽  
Cellular Adhesion ◽  
Point Of View ◽  
Metallic Materials ◽  
Wetting Properties ◽  
Thin Film Coatings ◽  
Microstructure Morphology

In this paper, ZnO and Co2+/Mg2+-doped ZnO thin films on TiAlV alloy substrates were obtained. The films were deposited by spin coating of sol-gel precursor solutions and thermally treated at 600 °C for 2 h, in air and slow cooled. The doping ions concentration was 1.0 mol%. The study’s aim was to obtain implantable metallic materials with improved biocompatibility and antibacterial qualities. The characteristics of the thin films were assessed from the point of view of microstructure, morphology, wetting properties, antibacterial activity and biological response in the presence of amniotic fluid stem cells (AFSC). The results proved that all deposited samples were nanostructured, suggesting a very good antibacterial effect and proving to be suitable supports for cellular adhesion and proliferation. All properties also depended on the doping ion nature.

Sol-Gel Synthesis of Soda Lime Silica-Based Bioceramics Using Waste as Renewable Sources

2021 ◽  
Author(s):  
Palakurthy Srin ◽  
P. Abdul Azeem ◽  
K. Venugopal Reddy
Keyword(s):  
Rice Husk ◽  
Low Cost ◽  
Sol Gel ◽  
Soda Lime ◽  
Sintered Sample ◽  
Biological Properties ◽  
Point Of View ◽  
Renewable Sources ◽  
Bioactive Ceramics

Abstract The purpose of the work is to prepare and assess soda lime silica-based (SiO2-CaO-Na2O) bioactive ceramics using waste as renewable sources. Thus we produced a SiO2-CaO-Na2O-based bioactive ceramic by sol-gel process using rice husk and eggshells as sources of silica and calcium oxide, respectively. The precursors such as calcinated eggshell powder, rice husk ash (RHA) and sodium hydroxide (NaOH) were processed by the sol-gel method, resultant in SiO2-CaO-Na2O-based bioactive ceramics. The gel derived sintered sample showed combeite high (Na6Ca3Si6O18) as a major crystalline phase. Subsequently, the sintered specimens were analyzed from the physical and structural point of view, and in terms of apatite mineralization rate in simulated environments and cytocompatibility in relative to human osteoblast-like cells. The studies showed that the produced crystalline SiO2-CaO-Na2O-based ceramics showed an average porosity of 45%. In vitro evaluation of the biological properties revealed that the prepared ceramics possesses the mineralization of carbonated hydroxyapatite (CHA) in a simulated environment with good cytocompatibility and controlled degradation rate. Therefore, the results obtained suggest that the prepared SiO2-CaO-Na2O-based bioactive ceramics using waste as renewable sources might be a low cost ceramics for applications in biomedical field.

Study of Biological Properties of Thin-Film Materials on the Basis of the SIO2–P2O5–СaO System

2016 ◽  
Vol 683 ◽  
pp. 427-432 ◽  
Author(s):  
Lyudmila P. Borilo ◽  
Ekaterina S. Lyutova ◽  
Larisa N. Spivakova
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Single Crystal Silicon ◽  
Film Coating ◽  
Biological Properties ◽  
Oxide System ◽  
Crystal Silicon ◽  
Practical Applications ◽  
Film Forming ◽  
The Moment

Thin films were obtained from film-forming solutions by the sol-gel method on the basis of the SiO2-P2O5-СаO system. Thin films were produced on the single-crystal silicon substrates (model substrate) by extraction at a velocity of 5 mm/s following by heat treatment at a temperature of 60°С for 20 minutes and at a temperature of 600°С for 1 hour. During the experiment it was established that film-forming solutions are usable only for 2 to 7 days from the moment of preparation. Using thermal and infra-red – spectroscopic analysis main stages of oxide system formation were retraced. According to data from x-ray phase analysis phases CaClH2PO4∙H2O, Ca(H2PO4)2∙H2O, CaHPO4∙2H2O, Ca2SiO4∙H2O, Ca5(PO4)3Cl. On the supporter’s surface a homogeneous film coating with quite equally spaced crystal-like formations with the diameter of 10-11 microns at the distance of 1-30 microns was formed. Phase composition, surface properties and biological activity of the synthesized materials were investigated. XRD results indicated that after being immersed into the SBF, hydroxylapatite, wollastonite, and chlorapatite were formed on the samples’ surfaces, which was important for practical applications

Photocatalytic degradation of acetaminophen from water solutions via thin films part I: preparation, characteriation, and analysis of titanium dioxide thin films

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sunil Rawal ◽  
Sabrina H. Buer ◽  
Wayne Hawkins ◽  
Jonathan Robby Sanders ◽  
Pedro E. Arce
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Titanium Dioxide ◽  
Sol Gel ◽  
Cost Effective ◽  
Degradation Process ◽  
X Ray Diffraction ◽  
Thin Film Coatings ◽  
Glass Slides ◽  
Titanium Dioxide Thin Films

Abstract The utilization of titanium dioxide (TiO2) photocatalysis for water and air purification is a frequently used method due to TiO2 having properties making it chemically inert, highly cost-effective, abundant, non-toxic, and environmentally-friendly. In an effort to increase the efficiency of the degradation process, an in-depth understanding of the effects of the structure and number of thin film coatings is needed. Transparent, anatase-form titanium dioxide thin films were prepared via the sol-gel method and deposited onto microscopic glass slides using a novel spraying technique, with coatings ranging from 1 to 10. Characterization of the TiO2 thin film coated slides was performed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The contribution shows that the coating technique is efficient in covering important areas of the surface and that it is suitable for a multiple coating layers thin film. The SEM imagines show that the surface of the slides increase coverage as the number of layers increases. This is potentially suitable for a mechanized spraying approach to upscaling the production of thin films for advanced oxidation applications.

scholarly journals Pulsed Laser Deposition Derived Bioactive Glass-Ceramic Coatings for Enhancing the Biocompatibility of Scaffolding Materials

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2615 ◽  
Author(s):  
Ruxandra-Ioana Schitea ◽  
Alexandru Nitu ◽  
Andreea-Aurelia Ciobota ◽  
Andrei-Lucian Munteanu ◽  
Irina-Madalina David ◽  
...  
Keyword(s):  
Bioactive Glass ◽  
Glass Ceramic ◽  
Room Temperature ◽  
Sol Gel ◽  
Biological Response ◽  
Thick Layer ◽  
Ceramic Coatings ◽  
Material Point ◽  
Point Of View ◽  
The One

The purpose of this work was to propose and evaluate a new composition for a bioactive glass-ceramic starting from the well-known 45S5 commercial product. Thus, we developed a modified version, including MgO, an oxide that turned out to induce superior mechanical properties and improved biological response. This had the following molar percentages: 46.1% SiO2, 2.6% P2O5, 16.9% CaO, 10.0% MgO, and 24.4% Na2O. The precursor alkoxides and nitrates were processed by a standard sol-gel technique, resulting in a glass-ceramic target, suitable for laser ablation experiments. Combeite (Na2Ca2Si3O9) was identified as a main crystalline phase within the calcined sol-gel powder, as well as in the case of the target sintered at 900 °C. The thin films were deposited on silicon substrates, at room temperature or 300 °C, being subsequently characterized from the material point of view, as well as in terms of bioactivity in simulated conditions and biocompatibility in relation to human fibroblast BJ cells. The investigations revealed the deposition of nanostructured glassy layers with a low proportion of crystalline domains; it was shown that a higher substrate temperature promoted the formation of surfaces with less irregularities, as a consequence of material arrangement into a shell with better morphological homogeneity. The complex elemental composition of the target was successfully transferred to the coatings, which ensured pronounced mineralization and a stimulating environment for the cell cultures. Thereby, both samples were covered with a thick layer of apatite after immersion in simulated body fluid for 28 days, and the one processed at room temperature was qualified to be the best in relation to the cells.

Synthesis and Biological Properties of Thin-Film Materials on the Basis of SiO2–P2O5–СаO–Na2O System

2015 ◽  
Vol 670 ◽  
pp. 196-201
Author(s):  
Lyudmila P. Borilo ◽  
Ekaterina S. Lyutova ◽  
Larisa N. Spivakova
Keyword(s):  
Thin Films ◽  
Calcium Ions ◽  
Calcium Phosphates ◽  
Sol Gel ◽  
Film Surface ◽  
Biological Properties ◽  
Oxide System ◽  
Crystal Silicon ◽  
Film Forming ◽  
Sbf Solution

Thin films for the SiO2–P2O5–CaO–Na2O system are synthesized using sol-gel method. Content of the oxides in the system is 52-18-20-10 wt.% correspondingly. Thin films were produced from film-forming solutions on the single-crystal silicon substrates (model substrate) by extraction at a velocity of 5 mm/s following by heat treatment at a temperature of 60-80 °С for 20 minutes and at a temperature of 600 °С for 1 hour. During the experiment it was established that film-forming solutions are usable only for 2 to 7 days from the moment of preparation. Using thermal and infra-red – spectroscopic analysis main stages of oxide system formation were retraced. On the surface of the material NaCl, CaCl2, H2PO4·H2O, Ca5(PO4)3Cl, and SiO2 phases are being registered. Presence of the significant amount of pores leads to the essential increase in the specific surface area, creating optimal conditions for the new bone tissue formation. Biological activity of the received material was evaluated in SBF environment. Ca and P content on the surface of the material increased twofold in two weeks. Such material interchanges calcium ions and phosphate ions with solution; silanol groups fix calcium ions, furthering the formation of the layer of amorphous calcium phosphates gradually crystallizing in hydroxyapatite, and other calcium phosphates. Presence of magnesium and sodium on the surface of the samples after their immersion into SBF solution indicates the settling of SBF solution components on the film surface.

scholarly journals Sol–gel synthesis of calcium phosphate-based coatings – A review

Chemija ◽  
2020 ◽  
Vol 31 (1) ◽  
Author(s):  
Kunio Ishikawa ◽  
Aivaras Kareiva
Keyword(s):  
Thin Films ◽  
Calcium Phosphate ◽  
State Of The Art ◽  
Sol Gel ◽  
Calcium Hydroxyapatite ◽  
Biological Properties ◽  
Review Article ◽  
Metallic Implants ◽  
Phosphate Coatings ◽  
Sol Gel Synthesis

Calcium phosphate (CP)-based biomaterials, especially nanostructured ones, show a high biocompatibility and increased biological properties. The coatings composed of stoichiometric hydroxyapatite have been extensively used to improve integration of metallic implants in the host bone. However, these coatings exhibited several drawbacks that limited their successful application. It was concluded in numerous articles that the sol–gel derived coatings can undergo cracking and delamination and are scarcely uniform. In this review article the recent advances on the sol–gel synthesis of different phosphate coatings and thin films are summarized. The attention is paid to coatings and thin films of calcium hydroxyapatite (CHAp), other phosphates, bioglasses and different composite materials. The state of the art, limitations, potentialities, open challenges, and the future scenarios for the application of CP bioceramics are highlighted in this study.

The crystallization of thin-film ceramics

1992 ◽  
Vol 50 (1) ◽  
pp. 338-339
Author(s):  
J.M. Schwartz ◽  
L.F. Francis ◽  
L.D. Schmidt ◽  
P.S. Schabes-Retchkiman
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Sol Gel ◽  
Processing Route ◽  
Small Areas ◽  
Ceramic Thin Films ◽  
Complex Shapes ◽  
Sol Gel Process ◽  
Ceramic Precursors ◽  
Crystalline Ceramic

Ceramic thin films and coatings are of interest for electrical, optical, magnetic and thermal barrier applications. Critical for improved properties in thin films is the development of specific microstructures during processing. To this end, the sol-gel method is advantageous as a versatile processing route. The sol-gel process involves depositing a solution containing metalorganic or colloidal ceramic precursors onto a substrate and heating the deposited layer to form a crystalline or non-crystalline ceramic coating. This route has several advantages, including the ability to create tailored microstructures and properties, to coat large or small areas, simple or complex shapes, and to more easily prepare multicomponent ceramics. Sol-gel derived coatings are amorphous in the as-deposited state and develop their crystalline structure and microstructure during heat-treatment. We are particularly interested in studying the amorphous to crystalline transformation, because many key features of the microstructure such as grain size and grain size distribution may be linked to this transformation.

Epitaxial Growth of Sr0.3Ba0.7Nb2O6 Thin Films Prepared by Sol-Gel Process

1999 ◽  
Vol 606 ◽  
Author(s):  
Keishi Nishio ◽  
Jirawat Thongrueng ◽  
Yuichi Watanabe ◽  
Toshio Tsuchiya
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Epitaxial Growth ◽  
Raw Materials ◽  
Substrate Surface ◽  
Sol Gel ◽  
Tungsten Bronze ◽  
Monomethyl Ether ◽  
Tetragonal Tungsten Bronze ◽  
Sol Gel Process

AbstructWe succeeded in the preparation of strontium-barium niobate (Sr0.3Ba0.7Nb2O6 : SBN30)that have a tetragonal tungsten bronze type structure thin films on SrTiO3 (100), STO, or La doped SrTiO3 (100), LSTO, single crystal substrates by a spin coating process. LSTO substrate can be used for electrode. A homogeneous coating solution was prepared with Sr and Ba acetates and Nb(OEt)5 as raw materials, and acetic acid and diethylene glycol monomethyl ether as solvents. The coating thin films were sintered at temperature from 700 to 1000°C for 10 min in air. It was confirmed that the thin films on STO substrate sintered above 700°C were in the epitaxial growth because the 16 diffraction spots were observed on the pole figure using (121) reflection. The <130> and <310> direction of the thin film on STO were oriented with the c-axis in parallel to the substrate surface. However, the diffraction spots of thin film on LSTO substrate sintered at 700°C were corresponds to the expected pattern for (110).

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