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Wyświetlanie 1-10 z 138
Tytuł:
Intrinsic hydrophilic character of carbon nanotube networks
Autorzy:
Janas, Dawid
Łukawski, Damian
Lisiecki, Filip
Stando, Grzegorz
Wydawca:
Elsevier
Cytata wydawnicza:
Grzegorz Stando, Damian Łukawski, Filip Lisiecki, Dawid Janas, Intrinsic hydrophilic character of carbon nanotube networks, Applied Surface Science, Volume 463, 2019, pp. 227-233, https://doi.org/10.1016/j.apsusc.2018.08.206.
Opis:
The Silesian University of Technology (Grant Agreement - 04/020/ RGJ18/0057). National Science Center, Poland (Grant Agreement - UMO-2015/19/P/ST5/03799, UMO-2015/19/N/ST8/02184). The European Union’s Horizon 2020 research and innovation programme (Grant Agreement - 665778).
We have demonstrated that nanocarbon materials such as carbon nanotubes (CNTs) or graphene have an intrinsically hydrophilic nature. Addition of liquid hydrocarbons or polycyclic aromatic compounds, which are the common side-products of nanocarbon syntheses, turned the otherwise hydrophilic CNT films hydrophobic. The very small amount needed to cause this effect was not discernable by SEM or Raman spectroscopy and also it could be easily overlooked by other methods of analysis. Upon simple and rapid thermal desorption of these species we were able to fully recover the water affinity in these CNT networks. Without using any oxidizing agents the material remains hydrophilic for weeks having water contact angle of about 35°. The results pave the way towards implementation of low-dimensional nanostructures in the real life without disrupting their inherent properties.
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
Wettability of poly(ester-ether)s for tissue engineering
Autorzy:
Kozłowska, A.
Piegat, A.
Fray, M. el
Kubies, D.
Chanova, E.
Pop-Georgievski, O.
Rypacek, F.
Tematy:
tissue engineering
wettability
biomaterials
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:
https://bibliotekanauki.pl/articles/283903.pdf  Link otwiera się w nowym oknie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of contact angle measurement methods of liquids on metal alloys
Autorzy:
Terpiłowski, Konrad
Hołysz, Lucyna
Rymuszka, Diana
Banach, Robert
Tematy:
metal alloys
wettability
contact angle
Pokaż więcej
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Powiązania:
https://bibliotekanauki.pl/articles/763967.pdf  Link otwiera się w nowym oknie
Opis:
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of chitosan and lipid layers deposited onto polyethylene terephthalate (pet) on its wetting properties
Autorzy:
Szafran, Klaudia
Jurak, Małgorzata
Wiącek, Agnieszka Ewa
Tematy:
chitosan
surface free energy
wettability
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Powiązania:
https://bibliotekanauki.pl/articles/2131531.pdf  Link otwiera się w nowym oknie
Opis:
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lutowanie kompozytów miedź - grafen z ceramiką korundową za pomocą lutów aktywnych
Brazing of copper - graphene composites with alumina ceramic using active braze materials
Autorzy:
Strąk, C.
Siedlec, R.
Tematy:
lutowanie
kompozyt
zwilżalność
brazing
composite
wettability
Pokaż więcej
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
Powiązania:
https://bibliotekanauki.pl/articles/192046.pdf  Link otwiera się w nowym oknie
Opis:
Do wykonania kompozytu objętościowego, przeznaczonego do lutowania, zastosowano proszki dostępnego handlowo grafenu oraz zredukowanego termicznie tlenku grafenu, na których osadzano tlenek miedzi metodą strącania z kąpieli elektrochemicznej. Proszki poddano obróbce termicznej w atmosferze beztlenowej, a następnie wyprasowano z nich kształtki na prasie służącej do prasowania i spiekania pod ciśnieniem. Uzyskane kompozyty spajano z ceramiką korundową za pomocą aktywnych lutów srebrowych (CB1). Przed procesem spajania kompozyty poddano procesowi galwanizacji miedzią. Zbadano mikrostrukturę i właściwości samego kompozytu oraz mikrostrukturę uzyskanych złączy. Na podstawie przeprowadzonych badań określono najkorzystniejsze warunki procesu spajania kompozytów.
To produce composites, commercial graphene powders and thermally reduced graphene oxide were used. Nanocrystalline copper oxide (CuO) thin films, synthesized by a sol–gel method, were deposited on the powders. These powders were annealed in an oxygen-free atmosphere and subsequently hot pressed. The outcome composites were bonded to alumina ceramic using active silver braze material (CB1). Before the process of bonding, the composites were plated with copper. The microstructure and properties of the composite and also the microstructure of the obtained joints were examined. Based on the studies carried out, optimal bonding conditions were determined.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physicochemical properties and cytotoxicity of hydrogels based on Beetosan® containing sage and bee pollen
Autorzy:
Tyliszczak, Bożena
Drabczyk, Anna
Kudłacik-Kramarczyk, Sonia
Grabowska, Beata
Kędzierska, Magdalena
Tematy:
hydrogels
cytotoxicity
fibroblasts
chitosan
sage
wettability
Pokaż więcej
Wydawca:
Polskie Towarzystwo Biochemiczne
Powiązania:
https://bibliotekanauki.pl/articles/1038565.pdf  Link otwiera się w nowym oknie
Opis:
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Materials V. 42 No 4
Brazing of copper - graphene composites with alumina ceramic using active braze materials
Materiały Elektroniczne T. 42 Nr 4
Lutowanie kompozytów miedź - grafen z ceramiką korundową za pomocą lutów aktywnych
Autorzy:
Strąk Cezary
Współwytwórcy:
Siedlec Robert
Wydawca:
ITME
Powiązania:
Electronic Materials
s.:15
p.: 15
Materiały Elektroniczne
Opis:
p.: 4-15 il. 30 cm.
Bibliogr. s.: 15
s.: 4-15 il. 30 cm.
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Książka
Tytuł:
Fabrication of transparent polysiloxane coatings on a glass support via the sol-gel dip coating technique and the effect of their hydrophobization with hexamethyldisilazane
Autorzy:
Chodkowski, Michał
Terpiłowski, Konrad
Pasieczna-Patkowska, Sylwia
Tematy:
silica
coating
hydrophobization
wettability
HMDS
bubbler
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/1450109.pdf  Link otwiera się w nowym oknie
Opis:
This study aimed at synthesis, preparation, and physicochemical properties investigation of undoped polysiloxane-based coatings deposited on the glass supports. The other goal was to test the effectiveness of their hydrophobization with hexamethyldisilazane at an elevated temperature using a bubbler. The coatings were obtained in a sol-gel process by acid-assisted hydrolysis of tetraethoxysilane and they were applied to the glass supports using the dip coating technique with various withdrawal speeds. The synthesized composition was scanned using TurbiscanLAB and its particle size was determined by means of the dynamic light scattering technique. The obtained surfaces were examined based on the water wettability measurements, photoacoustic spectroscopy, and transmittance measurements. It was found that the stability of the sol did not change during the dip-coating. Smooth, homogeneous, uniform, hydrophobic, and transparent coatings on the glass supports were obtained. Their wettability was determined by the contact angle in the range from 83.5 to 95.2 degrees and very low contact angle hysteresis. The hydrophobic effect obtained by modification with hexamethyldisilazane appears to be permanent – the contact angles do not change significantly after 7 days. The synthesized sol composition appears to be a good starting point for its chemical and physical modification for hydrophobicity increase and surface properties modification. Moreover, the hydrophobization of the coatings with hexamethyldisilazane at an elevated temperature using the bubbler did not have the desired effect.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 138

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