Search Results

You are looking at 1 - 10 of 41 items for :

  • Materials Sciences x
Clear All
Open access

R. Major, J. Lackner, P. Wilczek, M. Sanak, B. Jakieła, B. Stolarzewicz, M. Kowalczuk, M. Sobota, K. Maksymow, M. Spisak and B. Major

Functional cardio-biomaterials

Titanium as well as carbon based biomaterials, seem to be good candidates for future blood-contact applications. Bio-materials such as: Ti, Ti+DLC, TiN; Ti(C, N) with higher carbon concentration and DLC (diamond like carbon) were under examinations. Trials on surface modification of PU (polyurethane) substrate using ion mill were performed. Materials were deposited as thin films by the hybrid pulsed laser deposition (PLD) technique to examine the influence of the fabricated surfaces on cell behavior. The metallic titanium as a target was used for titanium based-film and graphite one for DLC. Phase content of deposited films was controlled by the flowing gas mixture of Ar+N2 and Ar+N2+C2H2 type in the reactive chamber. Sputtering of graphite was carried out in Ar atmosphere. The kinetic energy of the evaporated particles was controlled by application of variation of different reactive and non reactive atmospheres during deposition. Transmission electron microscopy (TEM) was used to reveal structure dependence on specific atmosphere in the reactive chamber. The measurement of the strength of bonds between biomaterials and cells is a major challenge in cellular biology since it allows for the identification of different species in adhesion phenomena. The biomaterial examinations were performed in static conditions with Dictyostelium discoideum cells and then subjected to a dynamical test to observe the cell detachment kinetics. For a given cell, detachment occurs for critical stress values caused by the applied hydrodynamic pressure above a threshold which depends on cell size and physicochemical properties of the substrate, but it is not affected by depolymerization of the actin and tubulin cytoskeleton. Tests revealed differences in behavior in respect to the applied coating material. The strongest cell-biomaterial interaction was observed for the carbon-based materials compared to the titanium and titanium nitride.

A surface fuctionalization was realized by: (i) fabrication of migration channels by laser ablation, (ii) electrospinning and (iii) deposition of multilayer film from polyelectrolites. A goal of the performed research was formation of scaffolds for bio-mimetic coatings. Surface morphology examinations and biomedical studies on porous and semi-porous materials with application of human endothelial cells HUVEC line were performed by application of confocal laser scanning microscopy (CLSM).

Open access

Mette Rica Geiker and Emmanuel Gallucci

, Jakobsen HJ, Geiker MR, Stang H, Krøyer H, Skibsted JB: “ Suspension of clays in water for addition to e.g. concrete ”. Patent WO2008052554A1, 2008-05-08. 10. EN 196-1. Methods of testing cement - Part 1: Determination of strength, 2005. 11. EN 1015-03. Determination of consistence of fresh mortar (by flow table), 2004 12. NordTest, NT Build 492, “Concrete, mortar and cement-based repair materials: chloride migration coefficient from non-steady-state migration experiments”, approved 1999-11. 13. Fontenay le Sage de C, Sellevold EJ: “Ice formation

Open access

T.V. Bgasheva, E.A. Ahmetshin and E.V. Zharikov

color zoning by internal migration and formation of color centers. Contributions to Gemology, 11 (2002), 1-48. 16. Emmett J.L., Scarratt K., McClure S.F. et al.: Beryllium diffusion of ruby and sapphire. Gems&Gemology, 39 (2003), 84-135. 17. Bgasheva T.V., Akhmetshin E.A., Zharikov E.V.: Enhancement of colour characteristics of fancy sapphires by heat treatment in reducing condition. Proceedings of 30th International Gemmological Conference, Moscow, 2007, 23-24. 18. Марфунин А.С.: Введение в физику минералов. Недра

Open access

Peter Dineff, Dilyana Gospodinova and Iva Avramov

flammability of treated wood. Meeting of working group COST Action E37: Sustainability through new technologies for enhanced wood durability, Hamburg, Germany, 08.÷09.11.2004. G. Troughton, and S. Chow. Migration of fatty acids to white spruce veneer surface during drying: Relevance to theories of inactivation. Wood Science, 1971, 3 (3): 129÷133; W. Hillis High temperature and chemical effects on wood stability. Wood Science and Technology, 1984, 18: 281÷293 Marra. Technology of wood bonding

Open access

B. Karpiński and M. Szkodo

. 33. Stadler P.J.: Influence of crystallographic habit and aggregate structure of authigenic clay minerals on sandstone permeability, Geologic Mijnbouw 53, 1973, 217-220. 34. Sommer F. (1975). Histoire diagtn&ique d'une strie grtseuse de Mer du Nord. Datation de l'introduction des hydrocarbures. Revue lnst. fr. Pdtrole 30, 729-740. 35. Hancock N.J. & Taylor A.M.: Clay mineral diagenesis and oil migration in the Middle Jurassic Brent Sand Formation, J. Geol. Soc. Lond. 135, 1978, 69-72. 36. Goven N., Howe W.F. & Davms D

Open access

Z. Ławrynowicz

), 1263-1265. 29. Trivedi R., Pound G.M.: The Effect of Concentration-Dependent Diffusion Coefficient on the Migration of Interphase Boundaries. J. Applied Physics 38 (1967), 3569-3576.

Open access

D. L. Alontseva, M. B. Abilev, A. M. Zhilkashinova, S. G. Voinarovych, O. N. Kyslytsia, E. Ghassemieh, A. Russakova and L. Łatka

Applications, R. Pignatello [ed.], InTech, London, UK, 2013, pp. 23-50. 5. Rahbek O., Overgaard S., Lind M., Bendix K., Bunger C., Soballe K.: Sealing effect of hydroxyapatite coating on peri-implant migration of particles. An experimental study in dogs. J Bone Joint Surg Br. [ed.], 2001, 83, 441–7. 6. Geesink RG.: Osteoconductive coatings for total joint arthroplasty. Clin Orthop Relat Res. [ed.], 2002, 395, 53–65. 7. Waheed S., Sultan M., Jamil T., Hussain T.: Comparative analysis of hydroxyapatite synthesized by sol-gel, ultrasonication and microwave

Open access

K. Dawidowska

-dimensional imaging of the aortic valve and aortic root with computed tomography: New standards in an era of transcatheter valve repair/implantation. Eur. Heart J. 30 (2009) 2079-2086. 12. Dwyer H. A., Matthews P. B., Azadani A., Ge L., Guy T. S., Tseng E. E. Migration forces of transcatheter aortic valves in patients with noncalcific aortic insufficiency. J. Thorac. Cardiovasc. Surg. 138 (2009) 1227-1233. 13. Totaro P., Morganti S., Ngo Yon C. L., Dore R., Conti M., Auricchio F., Vigano M., Computational finite element analyses to optimize graft sizing during aortic

Open access

Olatunde I. Popoola and Mutiu A. Fakunle

.Z. Lazaro and L.G. Heraldo, Case study: a 3 D resistivity and induced polarization imaging from downstream a waste disposal site in Brazil. Environ. Earth Science 2012: 66, 763 – 772 [21] S.L. Jegede, O. Ujuanbi, N.K. Abdullahi and R.E Iserhien – Ewekeme, Mapping and Monitoring of Leachate Plume Migration at an Open Waste Disposal site using Non – Invasive Methods. Research journal of Environmental and Earth Sciences, 2012: 4(1), 26-33 [22] N. Yalo, M. Lawson and C. Adihou, Geophysical Contribution for mapping the contaminant Plume of Leachate from Rubbish

Open access

M. Łucarz and D. Drożyński


The results of investigations concerning the influence of the applied sand matrix (fresh sand, reclaim) on the properties of moulding sands used for production of large dimensional castings (ingot moulds, ladles), are presented in the hereby paper. The performed investigations were aimed at determining the influence of various reclamation methods of spent moulding sands on the quality of the obtained reclaimed material. Moulding sands were prepared on the fresh quartz matrix as well as on sand matrices obtained after various reclamation methods. The selected moulding sand parameters were tested (strength, permeability, grindability, ignition losses, pH reactions). It can be stated, on the basis of the performed investigations, that the kind of the applied moulding sand matrix is of an essential meaning from the point of view of creating conditions minimising formation of large amounts of gases and their directional migration in a casting mould.