A sensitive mediator-free tyrosinase biosensor based on an inorganic–organic hybrid titania sol–gel matrix

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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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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Investigations on the mobility of novel sol–gel processed inorganic–organic hybrid materials

Journal of Materials Chemistry ◽

10.1039/b010009i ◽

2001 ◽

Vol 11 (5) ◽

pp. 1393-1401 ◽

Cited By ~ 10

Author(s):

Ekkehard Lindner ◽

Stefan Brugger ◽

Stefan Steinbrecher ◽

Erich Plies ◽

Hermann A. Mayer

Keyword(s):

Hybrid Materials ◽

Sol Gel ◽

Organic Hybrid

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New Inorganic-Organic Hybrid Polymers for Integrated Optics

MRS Proceedings ◽

10.1557/proc-519-239 ◽

1998 ◽

Vol 519 ◽

Cited By ~ 13

Author(s):

Christof Roscher ◽

Ralf Buestrich ◽

Peter Dannberg ◽

Oliver Rösch ◽

Michael Popall

Keyword(s):

Integrated Optics ◽

Sol Gel ◽

Optoelectronic Devices ◽

Transmission Losses ◽

Hybrid Polymers ◽

Organic Hybrid ◽

Catalyst Temperature ◽

Tunable Refractive Index ◽

Crosslinking Reactions ◽

Gel Processing

AbstractNew fluorinated inorganic-organic hybrid polymers (ORMOCER*s) for integrated optics were synthesized via hydrolysis and condensation (sol-gel processing) of functionalized pentafluorophenylalkoxysi lanes followed by organic crosslinking reactions. Process parameters (catalyst, temperature and ratio of educts) were optimized to achieve low transmission losses at the most important wavelengths for telecommunication in the NIR range: 1310 nm and 1550 nm.The result is a photopatternable transparent ORMOCER (negative resist behavior) with excellent low losses: 0.20 dB/cm at 1310 nm and 0.30 dB/cm at 1550 nm.Besides their high transparency the fluorinated ORMOCERs show a variety of other properties enabling their use as waveguide materials within the production of optoelectronic devices and related thin film technology: good wetting and adhesion on various substrates (e.g. glass, silicon and several polymers), low processing temperatures (postbake below 160 °C), high thermal stability (decomposition > 250°C) and a tunable refractive index.

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