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Characterisation of the surface structure and bioactivity of glass and glass ceramics using surface topography

100%

Lutišanová G., Palou M., Mikula M., Kozánková J.

Open Chemistry

2012

vol. 10

issue 6

1890-1898

The present paper reports the results of the relationship between the surface topography, microstructure and the in vitro bioactivity of samples with and without fluorapatite content in simulated body fluid. Glasses and glass ceramics belonging to the Li2O-SiO2-CaO-P2O5-CaF2 system were prepared by using conventional melting technique following by heat treatment to obtain glass ceramics. This current study demonstrates the benefits of combining two microscopic methods for better investigation of the surface structure. The formation of apatite layer on the surface and the increase in surface roughness proved that the glasses and glass ceramics with bioactive fluorapatite content could satisfy to the requirements for biomaterial applications. The results also showed that the roughness of apatite layer formed after immersion in body fluid on the surface of glasses with fluorapatite was more pronounced than that of equivalent glass ceramic samples cured under the same conditions. [...]

Elaboration of hybrid cotton fibers treated with an ionogel/carbon nanotube mixture using a sol-gel approach

100%

Valbe R., Tarkanovskaja M., Mäeorg U., Reedo V., Hoop A., Kink I., Lõhmus A.

Open Chemistry

2015

vol. 13

issue 1

Ionic liquid (IL) synergy with other materials may influence their properties significantly. Nevertheless, their advantageous liquid state turns out to be an impediment for applications in devices which need stable solid state shaping. In the current study we present a novel method where new siloxane functionalized IL acts as a modifier for carbon nanotubes (CNTs) and titanium alkoxide-CNT coated hybrid cotton fibers. This elaborated route carried out by interconnected and entangled ionic liquid, sol-gel and solid carbon nanotube networks opens up opportunities for functionalization of sol-gel materials with different shapes and sizes. The comparison of properties of IL, ionogel, ionogel/CNT mixture and titanium alkoxide coatings is performed. Ionogel-modified cotton fibers have increased hydrophobicity, linear density, breaking force and ultimate strength as compared to the uncoated cotton fibers. These properties are ensured even after washing threads with water. A uniformly coated CNT network around the fibers strengthens the material and increases its electric conductivity. New type of hybrids can be utilized in formulations which have UV-shielding and hydrophobic properties as well as for antibacterial properties. Characterization studies of the product were carried out by energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), optical microscopy and infrared (IR) spectroscopy.

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2 Open Chemistry

1 2014

1 2012

1 Hoop A.

1 Kink I.

1 Kozánková J.

1 Lutišanová G.

1 Lõhmus A.

1 Mikula M.

1 Mäeorg U.

1 Palou M.

1 Reedo V.

1 Tarkanovskaja M.

1 Valbe R.

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Characterisation of the surface structure and bioactivity of glass and glass ceramics using surface topography

Elaboration of hybrid cotton fibers treated with an ionogel/carbon nanotube mixture using a sol-gel approach