Preparation of inorganic-organic hybrid titania sol-gel nanocomposite films, and their dielectric properties

AbstractReal 3-D sub-νm lithography was performed with two-photon polymerization (2PP) using inorganic-organic hybrid polymer (ORMOCER®) resins. The hybrid polymers were synthesized by hydrolysis/polycondensation reactions (modified sol-gel synthesis) which allows one to tailor their material properties towards the respective applications, i.e., dielectrics, optics or passivation. Due to their photosensitive organic functionalities, ORMOCER®s can be patterned by conventional photo-lithography as well as by femtosecond laser pulses at 780 nm. This results in polymerized (solid) structures where the non-polymerized parts can be removed by conventional developers.ORMOCER® structures as small as 200 nm or even below were generated by 2PP of the resins using femtosecond laser pulses. It is demonstrated that ORMOCER®s have the potential to be used in components or devices built up by nm-scale structures such as, e.g., photonic crystals. Aspects of the materials in conjunction to the applied technology are discussed.

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A modified sol-gel process for multiferroic nanocomposite films

Journal of Applied Physics ◽

10.1063/1.2800804 ◽

2007 ◽

Vol 102 (8) ◽

pp. 083911 ◽

Cited By ~ 69

Author(s):

Ming Liu ◽

Xin Li ◽

Jing Lou ◽

Shijian Zheng ◽

Kui Du ◽

...

Keyword(s):

Sol Gel ◽

Nanocomposite Films ◽

Sol Gel Process

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Studies on structural, dielectric, impedance spectroscopy and magneto-dielectric properties of La0.7Ba0.3MnO3/P(VDF-TrFE) multiferroic (0–3) nanocomposite films

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.159104 ◽

2021 ◽

Vol 868 ◽

pp. 159104

Author(s):

Sougata Koner ◽

Pratik Deshmukh ◽

Anju Ahlawat ◽

A.K. Karnal ◽

S. Satapathy

Keyword(s):

Dielectric Properties ◽

Impedance Spectroscopy ◽

Nanocomposite Films

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Influence of Ca-Doping on Structural, Magnetic and Dielectric Properties of Ba3Co2-xCaxFe24O41 Hexaferrite Powders

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.241.226 ◽

2015 ◽

Vol 241 ◽

pp. 226-236 ◽

Cited By ~ 3

Author(s):

Neha Solanki ◽

Rajshree B. Jotania

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Sol Gel ◽

Calcium Content ◽

Combustion Method ◽

Dielectric Behavior ◽

Dielectric Parameters ◽

Ca Doping ◽

Auto Combustion ◽

Magnetic And Dielectric Properties

Influence of Ca substitution on structural, magnetic and dielectric properties of Ba3Co2-xCaxFe24O41(where x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), prepared by Sol-Gel auto-combustion method, has been investigated in present studies. The obtained powder was sintered at 950 oC for 4 hrs. in the static air atmosphere. Structural analysis of Ca-doped Ba3Co2-xCaxFe24O41powders revealed pure Z-type hexaferrite phase at low temperature. The frequency dependent dielectric constant (Єʹ) and magnetic properties such as remanent magnetization (Mr), saturation magnetization (Ms) and coercivity (Hc) were studied. It is observed that coercivity increased gradually with increase in calcium content. The real dielectric constant (Єʹ) and dielectric loss tangent (tan δ) were studied in the frequency range of 20Hz to 2MHz. The dielectric parameters for all samples show normal dielectric behavior as observed in hexaferrites. Contents of Paper

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Development of Adhesive, Bioactive and Antibacterial Titania Sol-Gel Coating on Titanium Substrate by Dip-Coating Technique

Coatings ◽

10.3390/coatings11020243 ◽

2021 ◽

Vol 11 (2) ◽

pp. 243

Author(s):

Diana Horkavcová ◽

Quentin Doubet ◽

Gisèle Laure Lecomte-Nana ◽

Eva Jablonská ◽

Aleš Helebrant

Keyword(s):

Simulated Body Fluid ◽

Body Fluid ◽

Sol Gel ◽

Titanium Substrate ◽

Dip Coating ◽

Coating Technique ◽

Metal Implants ◽

Excellent Adhesion ◽

Titania Sol ◽

Dip Coating Technique

The sol-gel method provides a wide variety of applications in the medical field. One of these applications is the formation of coatings on the metal implants. The coatings containing specific additive can enhance or improve the existing surface properties of the substrate. In this work, titania sol-gel coatings were doped with two forms of silver (AgNO3, Ag3PO4) and synthetic hydroxyapatite and applied on the titanium samples by dip-coating technique. After drying and slow firing, all coatings were characterized with scanning electron microscopy. Thin coatings were successfully prepared with excellent adhesion to the substrate (measured by ASTM D 3359-2), despite cracks. Coatings containing silver and hydroxyapatite demonstrated a 100% antibacterial effect against Escherichia coli after 24 h. The bioactivity of the coatings containing hydroxyapatite tested in modified simulated body fluid under static-dynamic conditions was confirmed by bone-like hydroxyapatite precipitation. To better understand the interaction of the coatings with simulated body fluid (SBF), changes of Ca2+ and (PO4)3− ions concentrations and pH values were studied.

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