Sol-Gel Derived Two-Dimensional Nanostructures of Calcium Phosphates

2014 ◽  
Vol 91 ◽  
pp. 13-18 ◽  
Author(s):  
A. Prichodko ◽  
V. Jonauske ◽  
M. Cepenko ◽  
A. Beganskiene ◽  
A. Kareiva
Keyword(s):  
Thin Films ◽  
Calcium Phosphates ◽  
Steel Substrate ◽  
Sol Gel ◽  
Calcium Hydroxyapatite ◽  
Xrd Analysis ◽  
Dip Coating ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Main Components

Calcium hydroxyapatite (Ca10(PO4)6(OH)2, CHAp), tricalcium phosphate (Ca3(PO4)2, TCP) and calcium oxide (CaO) are the main components of inorganic part of human bones. Such synthetic nanocomposites could be very important implantable materials and using as substitute material for human hard tissues (bones and teeth). In this study, an aqueous sol-gel chemistry route has been developed to prepare nanostructured CHAp thin films on stainless steel substrate. For the preparation of thin films dip-coating and spin-coating techniques were used. The final samples were obtained by calcination of coatings for different time at 1000 °C. For the characterization of surface properties, the X-ray powder diffraction (XRD) analysis, scanning electron microscopy (SEM), atomic force microscopy (AFM) and the contact angle measurements were recorded.

On the Properties of Yttria-Stabilized Zirconia Thin Films Prepared by Sol-Gel Method

1970 ◽  
Vol 17 (2) ◽  
pp. 191-196
Author(s):  
Artūras ŽALGA ◽  
Brigita ABAKEVIČIENĖ ◽  
Aleksej ŽARKOV ◽  
Aldona BEGANSKIENĖ ◽  
Aivaras KAREIVA ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Atomic Force ◽  
Contact Angle Measurements ◽  
Dip Coating Technique

The synthesis of nanostructured films of 20 mol% Y2O3 stabilized ZrO2 on corundum (Al2O3) substrates was performed from different sols using dip-coating technique. All obtained samples were repeatedly annealed at 800 °C temperature after each dipping procedure and fully characterized by X-ray diffraction (XRD) analysis. XRD data exhibited that at 800 °C temperature nano-sized Y0.2Zr0.8O2 thin films with cubic (Fm-3m) crystal structure have been formed. The morphological features of obtained coatings were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The surface tension and hydrophility of the synthesized films were determined by contact angle measurements (CAM).http://dx.doi.org/10.5755/j01.ms.17.2.491

scholarly journals A Novel Approach for Accelerated Fabrication of Calcium Hydroxyapatite Thin Films

2019 ◽  
Vol 25 (4) ◽  
pp. 365-368
Author(s):  
Pranas USINSKAS ◽  
Živilė STANKEVIČIŪTĖ ◽  
Gediminas NIAURA ◽  
Justinas ČEPONKUS ◽  
Aivaras KAREIVA
Keyword(s):  
Sol Gel ◽  
Calcium Hydroxyapatite ◽  
Xrd Analysis ◽  
Dip Coating ◽  
Complexing Agents ◽  
X Ray Diffraction ◽  
Angle Measurements ◽  
Novel Approach ◽  
Contact Angle Measurements ◽  
Dip Coating Technique

In this study we demonstrate, that sol–gel route is suitable to quicker obtain calcium hydroxyapatite (Ca10(PO4)6(OH)2, CHAp) coatings on crystalline Si substrate by modified dip-coating technique. The substrate was dip-coated by precursor and dried for 10 minutes at 200 °C with following cooling using the heating block for 110 min and annealing at 650 °C. Ethylendiamintetraacetic acid and 1,2-ethandiol, and triethanolamine and polyvinyl alcohol were used as complexing agents and as gel network forming agents, respectively. The obtained coatings were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), FTIR spectroscopy and contact angle measurements (CAM).

scholarly journals Sol–Gel Synthesis and Characterization of Coatings of Mg-Al Layered Double Hydroxides

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3738 ◽  
Author(s):  
A. Smalenskaite ◽  
M. M. Kaba ◽  
I. Grigoraviciute-Puroniene ◽  
L. Mikoliunaite ◽  
A. Zarkov ◽  
...  
Keyword(s):  
Thin Films ◽  
Layered Double Hydroxides ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Dip Coating ◽  
Dipping Process ◽  
Synthetic Approaches ◽  
Sol Gel Synthesis ◽  
Double Hydroxides ◽  
Steel Substrates

In this study, new synthetic approaches for the preparation of thin films of Mg-Al layered double hydroxides (LDHs) have been developed. The LDHs were fabricated by reconstruction of mixed-metal oxides (MMOs) in deionized water. The MMOs were obtained by calcination of the precursor gels. Thin films of sol–gel-derived Mg-Al LDHs were deposited on silicon and stainless-steel substrates using the dip-coating technique by a single dipping process, and the deposited film was dried before the new layer was added. Each layer in the preparation of the Mg-Al LDH multilayers was separately annealed at 70 °C or 300 °C in air. Fabricated Mg-Al LDH coatings were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and atomic force microscopy (AFM). It was discovered that the diffraction lines of Mg3Al LDH thin films are sharper and more intensive in the sample obtained on the silicon substrate, confirming a higher crystallinity of synthesized Mg3Al LDH. However, in both cases the single-phase crystalline Mg-Al LDHs have formed. To enhance the sol–gel processing, the viscosity of the precursor gel was increased by adding polyvinyl alcohol (PVA) solution. The LDH coatings could be used to protect different substrates from corrosion, as catalyst supports, and as drug-delivery systems in medicine.

Improving of Tribological Properties of Nanocomposites Sol-Gel Thin Films by Fluorocyclophosphazene Derivatives

2005 ◽  
Author(s):  
G. Celichowski ◽  
K. Chrobak
Keyword(s):  
Thin Films ◽  
Tribological Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
Rf Plasma ◽  
Good Thermal Stability ◽  
Force Microscopy ◽  
Coating Method ◽  
Dip Coating Method ◽  
Sol Gel Films

Fluorocyclophospazenes’ derivatives were used as modifiers for improving tribological properties of thin films prepared by sol-gel technique. Thin films were made on the base of aminopropyltriethoxysilane (APTS). All films were deposited by dip-coating method and post-treated by heat, UV radiation and low pressure of RF plasma. Chemical changes in sol-gel films during all steps of post-treatments and modifications were monitored by FT-IR spectroscopy and SIMS spectrometry. Topographies of modified surfaces were imaged by Atomic Force Microscopy (AFM). After final modification significant improvements of frictional properties were observed as well as their very good thermal stability.

Sol–gel synthesis of calcium hydroxyapatite thin films on quartz substrate using dip-coating and spin-coating techniques

2014 ◽  
Vol 71 (3) ◽  
pp. 437-446 ◽  
Author(s):  
Milda Malakauskaite-Petruleviciene ◽  
Zivile Stankeviciute ◽  
Aldona Beganskiene ◽  
Aivaras Kareiva
Keyword(s):  
Thin Films ◽  
Spin Coating ◽  
Quartz Substrate ◽  
Sol Gel ◽  
Calcium Hydroxyapatite ◽  
Dip Coating ◽  
Sol Gel Synthesis

scholarly journals Sol-gel derived coatings for the conservation of steel

2015 ◽  
Vol 9 (2) ◽  
pp. 81-89 ◽  
Author(s):  
Erika Kiele ◽  
Jurate Senvaitiene ◽  
Asta Grigucevicienė ◽  
Rimantas Ramanauskas ◽  
Rimantas Raudonis ◽  
...  
Keyword(s):  
Sol Gel ◽  
Dip Coating ◽  
Processing Route ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Before And After ◽  
Silica Sols ◽  
Commercial Polymers ◽  
Dip Coating Technique ◽  
Steel Substrates

In this paper, sol-gel processing route has been applied and investigated for the conservation of steel. Nanosilica coatings on steel surface have been prepared using tetraethylorthosilicate (TEOS) as a starting material. The methyl-modified silica sols were obtained by mixing of 3mas.% SiO2 sol solution with hexamethyldisilozane (HMDS). The surface of steel was coated by dip-coating technique. In order to compare the characteristics of coatings, the steel substrates were also coated with commercial polymers Paraloid B67, Cosmolloid H80 and Antik Patina. The surface morphology changes of the uncoated and coated specimens before and after photochemical ageing were investigated by scanning electron microscopy and atomic force microscopy. The structure of the prepared coatings was also investigated by FTIR spectroscopy. The hydrophobicity of surfaces was evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.

Thermal Annealing-Activated Crystallinity Metastasis of Al:ZnO Thin Films

2015 ◽  
Vol 1109 ◽  
pp. 181-185 ◽  
Author(s):  
Mohd Firdaus Malek ◽  
Mohamad Hafiz Mamat ◽  
M.Z. Musa ◽  
M. Rusop
Keyword(s):  
Thin Films ◽  
Thermal Annealing ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dip Coating Technique ◽  
Multilayered Thin Films

Multilayered thin films of aluminum-doped ZnO (Al:ZnO) have been deposited by the sol-gel dip coating technique. Experimental results indicated that the thermal annealing temperature affected the crystallinity of the Al:ZnO films. X-ray diffraction (XRD) analysis showed that thin films were preferentially orientated along the c-axis plane. The preferred orientation along (0 0 2) plane becomes more pronounced as the thermal annealing being increased. The film thickness ranges between 180 and 690 nm. In our experiments, the most optimum condition of Al:ZnO annealing temperature was both 500 oC.

scholarly journals Characterization of Sol-Gel Derived Calcium Hydroxyapatite Coatings Fabricated on Patterned Rough Stainless Steel Surface

Coatings ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 334 ◽  
Author(s):  
Vilma Jonauske ◽  
Sandra Stanionyte ◽  
Shih-Wen Chen ◽  
Aleksej Zarkov ◽  
Remigijus Juskenas ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Sol Gel ◽  
Calcium Hydroxyapatite ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Stainless Steel Surface ◽  
Angle Measurements ◽  
Hydroxyapatite Coatings ◽  
Diffuse Reflectance Infrared ◽  
Steel Substrates

Sol-gel derived calcium hydroxyapatite (Ca10(PO4)6(OH)2; CHA) thin films were deposited on stainless steel substrates with transverse and longitudinal patterned roughness employing a spin-coating technique. Each layer in the preparation of CHA multilayers was separately annealed at 850 °C in air. Fabricated CHA coatings were placed in simulated body fluid (SBF) for 2, 3, and 4 weeks and investigated after withdrawal. For the evaluation of obtained and treated with SBF coatings, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), X-ray diffraction (XRD) analysis, Raman spectroscopy, XPS spectroscopy, scanning electron microscopy (SEM) analysis, and contact angle measurements were used. The tribological properties of the CHA coatings were also investigated in this study.

Investigation on the Structural and Optical Properties of Nanocrystalline TiO2 Thin Films

2013 ◽  
Vol 678 ◽  
pp. 103-107 ◽  
Author(s):  
Arumugam Ranjitha ◽  
Natarajan Muthukumarasamy ◽  
Santhanam Agilan ◽  
Mariyappan Thambidurai ◽  
Rangasamy Balasundraprabhu ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Dip Coating ◽  
Band Gap Energy ◽  
Tio2 Thin Films ◽  
Nanocrystalline Tio2 ◽  
Structural Investigations ◽  
Force Microscopy ◽  
Coating Method ◽  
Dip Coating Method

Nanocrystalline TiO2 thin films were prepared by sol-gel dip coating method. The structural investigations were carried out using x-ray diffraction technique. Anatase TiO2 thin films with tetragonal phase were obtained and the grain size was observed to lie in the range of 21-25 nm. Analysis on the surface topography of prepared films have been carried out using atomic force microscopy (AFM). The band gap energy is calculated from the absorption spectra of TiO2 films and is found to lie in the range 3.3 to 3.7 eV.

Preparation and Characterization of SiO2-Coated TiO2 Thin Films via Sol-Gel Dip Coating Technique

2015 ◽  
Vol 1109 ◽  
pp. 148-152
Author(s):  
A.K.M. Muaz ◽  
U. Hashim ◽  
Sharipah Nadzirah ◽  
M. Wesam Al-Mufti ◽  
Fatimah Ibrahim ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Dip Coating ◽  
Spherical Particles ◽  
Thickness Variation ◽  
Morphological Effect ◽  
Force Microscopy ◽  
Atomic Force ◽  
Dip Coating Technique

In the present research, nanocrystalline TiO2thin films have been prepared via a sol-gel method using Ti {OCH(CH3)2}4act as a precursor. The morphological effect of sets of as-deposited and annealed samples (100, 300, 500 and 700°C for 1 hour) and thickness variation on the structural properties were investigated by Atomic Force Microscopy (AFM) measurements. The observation showed that the size of grain increases with film thickness, indicating that the size of the particles in the films can be effectively controlled by changing the temperature of thermal treatment. AFM topology images of the as-deposited and annealed TiO2films at 100 and 300°C indicates the films are rather smooth, compact, bulky, not uniform and column-like structure. TiO2thin films annealed at 500 and 700°C showed homogenous morphology surface with regular size of spherical particles.

Sign in / Sign up

Export Citation Format

Share Document