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1

EFFECT OF CHITOSAN AND LIPID LAYERS DEPOSITED ONTO POLYETHYLENE TEREPHTHALATE (PET) ON ITS WETTING PROPERTIES

100%

Szafran K., Jurak M., Wiącek A. E.

Progress on Chemistry and Application of Chitin and its Derivatives

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2021

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vol. 26

210-221

EN

The wetting properties of chitosan (Ch) and single 1,2-dipalmitoylsn-glycero-3-phosphocholine (DPPC), cholesterol (Chol) and binary DPPC-Chol layers deposited onto polyethylene terephthalate activated by low-temperature air plasma (PETair) were examined. PET is widely used in tissue engineering, but its low hydrophilicity limits its integration with the surrounding tissues. Ch is a biocompatible polysaccharide, distinguished by its antimicrobial properties, widely distributed in medicine. DPPC and Chol are the major building components of cell membrane, so they can perfectly mimic membrane behaviour during contact with the Ch layer. Monolayers of lipids were deposited onto PETair with or without the Ch layer using the Langmuir-Blodgett technique. The total surface free energy (SFE) and its components changes were calculated from theoretical approaches. Wettability strongly depended on the monolayer composition as well as the Ch layer. The Ch film decreased the contact angle and increased SFE of the PET surface with the lipid monolayers due to specific organisation of molecules within the chitosan scaffold. The most promising combination of surface modification for tissue engineering applications seems to be the PETair/Ch/DPPC-Chol system.

2

Comparison of contact angle measurement methods of liquids on metal alloys

100%

Terpiłowski K., Hołysz L., Rymuszka D., Banach R.

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

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2016

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vol. 71

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issue 1

EN

The paper presents the studies of metal wettability using two methods: the sessile droplet and immersion ones. Based on the measured contact angles, there was calculated apparent surface free energy from the acidic–basic approach and the contact angle hysteresis. The advancing contact angles measured using the immersion method exhibit a little higher values than those measured by the sessile droplet method. The application of the immersion method leads to obtaining higher contact angle hysteresis. Both methods give different values of contact angles but they can be applied independently for estimation of metal surface wettability.

3

Photocatalytic properties of transparent TiO2 coatings doped with neodymium

88%

Wojcieszak D., Kaczmarek D., Domaradzki J., Mazur M., Morawski A. W., Janus M., Prociów E., Gemmellaro P.

Polish Journal of Chemical Technology

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2012

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vol. 14

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issue 3

1-7

EN

In this work photocatalytic properties of TiO2 thin fi lms doped with 8.51 at. % of Nd were described. The self-cleaning phenomenon of thin fi lms was discussed together with the structural, optical and surface properties of prepared thin fi lms. Transparent coatings based on titanium dioxide were manufactured by high-energy reactive magnetron sputtering process. Incorporation of Nd during sputtering process results in amorphous behavior, without a signifi cant infl uence on transparency and colour as compared to the undoped TiO2-rutile matrix. Nevertheless, doping with neodymium doubles the photocatalytic activity of the matrix due to higher quantity of photo-generated charge carriers and more effi cient mechanism of energy transfer.

4

The Influence of the Process Parameters on the Microstructure and Properties SLM Processed 316L Stainless Steel

88%

Woźniak A., Adamiak M., Chladek G., Kasperski J., Woźniak A., Adamiak M., Chladek G., Kasperski J.

Archives of Metallurgy and Materials

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2020

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vol. 65

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issue 1

5

Evaluation of colloidal silica obtained via the co-precipitation method using octane as an organic phase

75%

Jesionowski T., Tepper B., Krysztafkiewicz A.

Polish Journal of Chemical Technology

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2007

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vol. 9

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issue 4

1-4

EN

The studies were conducted on the production of silica from emulsion systems by co-precipitation from solutions of sodium metasilicate and hydrochloric acid and octane were used as an organic medium. The obtained products were subjected to a comprehensive physicochemical analysis in order to define their dispersive and morphological properties. Particle diameters and polydispersity were determined by the NIBS (non-invasive back scattering) method while the shape and morphology of the particles were established using scanning electron microscopy (SEM). In order to determine the adsorptive properties of the obtained monodisperse silicas, isotherms of nitrogen adsorption/desorption on their surfaces were determined. Using the isotherms, also the specific surface area, the diameter and the volume of the pores were established. In order to define the hydrophilic/hydrophobic character of the products, profiles of wettability and of sedimentation in water were examined. The obtained products were well wettable with water and an increase in their weight depended on the amount of the applied surfactants. The particles of the precipitated silicas manifested a defined, spherical shape and showed a relatively low polydispersity.

6

The Influence of Alloying Additions on High Temperature Interaction Between Molten Compacted Graphite Iron and Alumina

75%

Sobczak N., Bacior M., Turalska P., Bruzda G., Homa M., Sobczak J. J., Sobczak N., Bacior M., Turalska P., Bruzda G., Homa M., Sobczak J. J.

Archives of Metallurgy and Materials

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2020

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vol. 65

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issue 3

7

Physicochemical properties and cytotoxicity of hydrogels based on Beetosan® containing sage and bee pollen

75%

Tyliszczak B., Drabczyk A., Kudłacik-Kramarczyk S., Grabowska B., Kędzierska M.

Acta Biochimica Polonica

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2017

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vol. 64

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issue 4

709-712

EN

Currently, increasing attention is being paid to issues related to environmental protection, waste management, as well as to the development of polymers with useful properties. The research presented here involved preparation of hydrogels based on Beetosan® - a chitosan derived from the multi-stage processing of dead bees. Moreover, hydrogels were additionally modified with natural substances - i.e. bee pollen and extract of Salvia officinalis (sage) that are well known for the presence of many compounds with beneficial properties from a medical point of view. Materials have been first obtained by photopolymerization. Then, their surface morphology, wettability and cytotoxicity to selected cell lines have been determined. It can be stated that such combination of Beetosan® hydrogel matrix and the mentioned additives resulted in a preparation of polymers characterized by negative impact on cancer cells. Impact of hydrogels with sage is slightly more intense due to the presence of substances such as ursalic or rosmaric acid that are characterized to have anticancer activity. Such negative impact has not been observed in case of studies using fibroblasts. Furthermore, addition of natural substances into hydrogels resulted in a more homogeneous surface and in the decrease of wettability angle of the tested polymers. It can be concluded that the use of natural-derived reagents and synthesis of polymers using these reagents (as a result of environmentally friendly photopolymerization) yields materials with interesting properties for medical purposes, with particular emphasis on antitumor activity, and without significant negative impact on fibroblasts.

Refine search results

EFFECT OF CHITOSAN AND LIPID LAYERS DEPOSITED ONTO POLYETHYLENE TEREPHTHALATE (PET) ON ITS WETTING PROPERTIES

Comparison of contact angle measurement methods of liquids on metal alloys

Photocatalytic properties of transparent TiO2 coatings doped with neodymium

The Influence of the Process Parameters on the Microstructure and Properties SLM Processed 316L Stainless Steel

Evaluation of colloidal silica obtained via the co-precipitation method using octane as an organic phase

The Influence of Alloying Additions on High Temperature Interaction Between Molten Compacted Graphite Iron and Alumina

Physicochemical properties and cytotoxicity of hydrogels based on Beetosan® containing sage and bee pollen