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The influence of nanoadditives on the biological properties and chemical composition of process fluids

Borůvková K., Bakalova T., Voleský L., Louda P.

Advances in Materials Science

2015

Vol. 15, nr 4(46)

59--66

In this study process fluids were tested after the addition of nanoparticles. Cooling and lubricating process fluids are used in machining to reduce wear on tools, to increase machine performance and to improve product quality. The use of process fluids leads to their pollution and contamination. Nanoparticles were added to the process fluids in order to increase their antibacterial activity. The selected nanoparticles were nanoparticles of metallic silver. The process fluids were modified by the addition of silver nitrate and ascorbic acid. Reduction of silver nanoparticles in the volume of the fluid was achieved using UV. The modified fluids were tested for their cytotoxicity and changes in chemical composition. The cytotoxicity of process fluids was tested for the purpose of verifying whether the process fluids, which are in direct contact with the skin of the operator, affect the health of the operator. The cytotoxicity of the process fluids was tested on human fibroblast cells. Fibroblasts are the basic cells of fibrous tissue. The cytotoxicity was tested by measuring the cell viability and using XTT. Analysis of chemical composition was performed for the purpose of determining the individual substances in the process fluids and their chemical stability. Qualitative analysis of the process fluids was performed using gas chromatography mass spectrometry (GC - MS).

Properties of modified carboxymethyl cellulose prepared by lyophilisation

Borůvková K., Wiener J.

Autex Research Journal

2013

Vol. 13, no. 3

79--81

This study deals with the change of selected properties of samples of modified carboxymethyl cellulose after freeze drying. The investigated properties were changes in thickness, permeability, water sorption, thermal area resistance and thermal absorbing capacity. The prepared materials were evaluated by scanning electron microscopy. The product of presented technology has large internal surface, high wettability and biodegradability. It is nontoxic with high potential in biological applications.