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Silica materials with biocidal activity

Chmilewska D., Łukasiewicz A., Michalik J., Sartowska B.

Nukleonika

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2006

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Vol. 51,suppl.1

69-72

EN

Pathogenic microorganisms like fungi, bacteria and algae are harmful to human beings and animals. Moreover, they contribute to the destruction of building materials by their biodegradation. Therefore, they create serious hazard for the natural environment. To prevent these phenomena, different materials with biocidal activity are being developed. In elaboration of such materials, one of the most difficult problems to be solved is the achievement of their high effectiveness in controlling harmful microorganism population with the guarantee of safety of their application to the natural environment and humans. As a result of investigation carried out in the INCT on new biocides based on quaternary N-alkylammonium salts (QAC), mainly benzalkonium chloride, and water glass (WG) large group of new silica materials with biocidal activity were synthesised. Possibilities of technology modification in order to obtain different profitable properties of materials are presented in the paper. Preliminary investigations concerning biocidal activity against selected mould fungi, bacteria and algae were performed. Results of microbiological investigations proved stable effectiveness of biocides for protection from harmful microorganisms growth, which does not decrease even after washing of biocidal material with water. Silica materials with biocidal activity due to structural binding of biocidal agent (QAC) can be applied in building industry as materials of high ecological safety.

2

Structural change in the silica gel caused by its treatment with heavy metal complexes of aminoalcohols

Grigoriew H., Łukasiewicz A., Chmielewska D.K., Płusa M., Bernstorff S.

Polish Journal of Chemical Technology

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2004

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Vol. 6, nr 1

14-16

EN

Silica gel treated with aminoalcohols or metal complexes of aminoalcohols obtains the ability to bind biocidal quaternary-N-alkylammonium salts (QAC). Structural changes caused by the treatment of the silica gel with copper complex of ethanolamine Cus4EA was investigated using the URD-6 diffractometer to find the crystal structure and synchrotrone ELETTRA at SAXS (small angle X-ray scattering) beamline to study mesostructure.

3

New silica materials with biocidal active surface

Łukasiewicz A., Chmielewska D., Waliś L., Rowińska L.

Polish Journal of Chemical Technology

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2003

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Vol. 5, nr 4

20-22

EN

As a result of investigations carried out in INCT on some applications of new fungicides containing QAC as a component, large group of new silica based materials based on this compound were obtained (SiO2-QAC). Preliminary biological tests showed strong biocidal activity of new SiO2-QAC materials on fungi and algae. It's possible to use them for numerous applications like: water reservoir or various surfaces desinfection, preventing objects from harmful biological agents by application of paints containing SiO2-QAC. Very economical materials based on water glass were obtained as well. Structure of these materials, especially origin of binding QAC with SiO2 as well as mechanism of biocidal activity of SiO2-QAC is under investigation. The materials also show high affinity to heavy metals and due to this fact can be applied as sorbents.

4

Weryfikacja kryteriów pękania elementów z karbami trójkątnymi

Łukasiewicz A., Seweryn A.

Eksploatacja i Niezawodność

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2001

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nr 5

6-8

PL

W pracy przedstawiono weryfikację doświadczalną czterech kryteriów pękania przystosowanych do analizy kruchego pękania elementów z karbami trójkątnymi w dwuosiowym stanie obciążenia (mode l + II).

EN

In this paper an experimental verification of four fracture criteria adapted for brittle fracture analysis of elements with V-shaped notches under biaxial loading (mode 1 and II) was presented.