Entity

Time filter

Source Type


Dobrzanski L.A.,Silesian University of Technology | Dobrzanski L.A.,Institute of Advanced Materials Technology
Archives of Materials Science and Engineering | Year: 2014

Purpose: of this paper is the general presentation of the synergic utilisation of medical knowledge, tissue engineering and materials engineering for fabrication of functional substitutes of damaged tissues in the case of which medical indications show that classical prosthetics/implantation cannot be completely avoided, and that it is also appropriate to achieve natural ingrowth of the implanted elements into a living tissue in the implant area. Design/methodology/approach: This refers to post-injury losses, post-resection losses, as well as those originating from operative treatment of cancerous tumours or inflammation processes. Implantable biomedical devices are currently aggregately considered to be medical bionic implants where bionics is understood as production and investigation of biological systems to prepare and implement artificial engineering systems which can restore the lost functions of biological systems. Findings: The development of new hybrid technologies of bioactive and engineering materials for personalised scaffolds of tissues and bones requires a number of basic research and application work. They are presented numerous examples of the needs of the research for application of various bioactive and engineering materials, and their respective materials processing and tissue engineering technologies for manufacturing of the hybrid personalised implants and scaffolds. Research limitations/implications: There are no reports in the references about an original concept presented by the Author of introduction of prosthetics/implantation and tissue engineering techniques for the purpose of natural ingrowth of the implanted elements into a living tissue in the implant area without having to use mechanical devices, at least in the connection (interface) zone of bone or organ stumps with prosthetic/implant elements. Practical implications: They are open up vast possibilities for the application of the hybrid technologies of bioactive and engineering materials for personalized scaffolds of tissues and bones in accordance with the concept of the Author, presented in this paper. Medical bionic implants encompass numerous solutions eliminating various disfunctions of a human organism, among other implants of the cardiovascular system (stents, vessel prostheses, heart valves, pacemakers, defibrillators), digestive system implants, neuron devices (implants and neuronal prostheses to the central (CNS) and peripheral nervous system (PNS), the cochlea, retina), orthopaedic prostheses (bone grafts, bone plates, fins and other connecting and stabilising devices, including screws applied in the area of ankles, knees and hands, bars and pins for stabilising fractured limbs), screws and plates in skull-jaw-face reconstructions, dental implants, and also scaffolds of bones and tissues in tissue engineering. Originality/value: The Author’s idea for the embracing hybrid technologies of bioactive and engineering materials with titanium alloys including personalised scaffolds of tissues and bones will be created. It is also a challenge to achieve a synergy of clinical effects obtained with classical prosthetics/implantation of large lost post-injury or post-resection recesses together with the use of achievements in advanced tissue engineering methods at least in the interface zone of bone or organ stumps with prosthetic elements/implants. © by International OCSCO World Press. All rights reserved. 2014 Source


Dobrzanski L.A.,Silesian University of Technology | Dobrzanski L.A.,Institute of Advanced Materials Technology | Mucha A.,Silesian University of Technology | Macek M.,Silesian University of Technology
Archives of Materials Science and Engineering | Year: 2014

Purpose: The paper presents a simply method of preparation of polymer matrix nanocomposite reinforced with carbon nanotubes and their influence on the mechanical properties. Design/methodology/approach: A series of polymer matrix nanocomposite materials at filler weight fractions 5%, 10%, 15%, 20%, 30% and 40% both in the absence and in the presence of multiwalled carbon nanotubes (MWCNTs) at a 0.1% wt. were prepared. The specimens were tested at 3 point-bending and tension using an universal testing machine. Findings: The paper presents the way of preparation of nanocomposite materials. The components were carefully measured and mixed in vacuum. The carbon nanotubes were homogenized using ultrasonicator. After that the mixture was injected into the moulds and heated in the temperature of 50°C by 24h. Practical implications: Polymer composites reinforced with carbon nanotubes are considered to be an important group of materials for many engineering applications. MWCNTs (used as reinforcement in nanocomposites) have greater mechanical strength and endurance and a greater modulus of elasticity comparing to carbon fibers. Polymer nanocomposites reinforced with carbon nanotubes have been used at the production of chemical sensors, materials using emission field phenomenon, media converters, electrical appliances, supercapacitors. Originality/value: Paper presents new polymer matric nanocomposites with high Young’s modulus. Polymer nanocomposites reinforced with carbon nanotubes are characterized by dimensional stability, high stiffness, toughness, heat resistance, low combustibility, reduction of the transmission of liquids and gases, the lower density, low thermal expansion coefficient, and increased electrical conductivity. © International OCSCO World Press. All rights reserved. Source


Dobrzanski L.A.,Silesian University of Technology | Dobrzanski L.A.,Institute of Advanced Materials Technology | Nieradka B.,Silesian University of Technology | Macek M.,Silesian University of Technology | Matysiak W.,Silesian University of Technology
Archives of Materials Science and Engineering | Year: 2014

Purpose: In the paper the fabrication of composite nanofibers using electrospinning technique was reported. That processing technique was used to synthesis composite nanofibers with various morphologies using a precursor composed of poly(vinyl) alcohol (PVA), copper acetate (CuAC) and acetic acid (C2H3OH). The morphology of formed nanofibers depends not only on the spinning parameters, but also on the composition of the polymer solution. The purpose of the study was to obtain results that allowed to determine the influence of parameters of the electrospinning process on morphology of the composite nanofibers. Design/methodology/approach: The obtained nanofibers were characterized through high resolution scanning electron microscopy (SEM). It was noticed that the morphology of composite nanofibers depends on the applied voltage and nozzle-collector distance. The research was carried on a scanning electron microscope. Findings: The influence of parameters of the electrospinning process on morphology of the composite nanofibers was determined. Research limitations/implications: The research was carried out on samples, not on final elements. Originality/value: The paper presents the influence of the electrospinning parameters on the morphology of composite nanofibers. © by International OCSCO World Press. All rights reserved. 2014. Source


Dobrzanski L.A.,Silesian University of Technology | Dobrzanski L.A.,Institute of Advanced Materials Technology | Macek M.,Silesian University of Technology | Tomiczek B.,Silesian University of Technology
Archives of Materials Science and Engineering | Year: 2014

Purpose: The main purpose of this work is to determine morphology, as well as technological and mechanical properties of aluminium matrix powder reinforced with multi-walled carbon nanotubes (MWCNTs) using powder metallurgy techniques. Dispersion of the multi-walled carbon nanotubes was achieved by using mechanical milling in a high energy ball mill. The addition of MWCNTs cause significant improvement in mechanical properties of Al/MWCNTs nanocomposites what is confirmed with more than a threefold increase in the hardness of composite powders, as compared to this value before milling. Design/methodology/approach: The main problem of the study is the agglomeration and poor distribution of carbon nanotubes in the matrix material. In order to achieve uniform dispersion of carbon nanotubes in aluminium alloy matrix mechanical milling was used. Additional problem is possible formation of the brittle aluminium carbides in the result of reaction between carbon nanotubes and aluminium particles. Findings: On the basis of micro-hardness testing has found that a small addition of carbon nanotubes in an amount of 0.5% by volume increases composites hardness by 13%, while the addition of carbon nanotubes in an amount of 5% by volume results in an increase of 37%. Practical implications: Composite powders carbon nanotubes were prepared using powder metallurgy method which shows the practical implications in manufacturing of nanocomposites. Originality/value: The investigation results shows that the technology of composite materials manufacturing can find the practical application in the production of new light metal matrix composites. It was found that carbon nanotubes, used as reinforcing phase, have influence on the properties of metal matrix composites. © by International OCSCO World Press. All rights reserved. 2014. Source


Kremzer M.,Silesian University of Technology | Dobrzanski L.A.,Silesian University of Technology | Dobrzanski L.A.,Institute of Advanced Materials Technology | Dziekonska M.,Silesian University of Technology | Radziszewska A.,Silesian University of Technology
Archives of Materials Science and Engineering | Year: 2014

Purpose: The goal of the paper is to develop technologies for manufacturing composite materials with casting aluminum alloy matrix reinforced by silicon AN AC-AlSi12 and to investigate the effect of the amount of the pore forming agent in the form of graphite MG 192 on the structure and properties of porous ceramic skeleton infiltrated with liquid aluminum alloy. Design/methodology/approach: The composite was manufactured by the use of porous material pressure infiltration method. Hardness test was carried out with Rockwell method in A scale. The wear resistance was measured by the use of TSM Instruments Tribometer. The tribomiter allows to realize dry friction wear mechanism conditions. Additionally the examinations on stereomicroscope of wear tracks were made. Findings: Composite materials reinforced by porous skeleton manufactured on the base Al2O3particles show superior in mechanical properties and wear resistance than the aluminum alloy EN AC-AlSi12 constituting the matrix. The developed composite materials also have better wear resistance compared to the matrix. Practical implications: Tested composite materials can be applied in many industry branches, among others, in the automotive, aerospace industry and in manufacturing of professional sports equipment. Originality/value: The investigation results shows that the worked out technology of composite materials manufacturing can find the practical application in the production of near net shape and locally reinforced elements. © International OCSCO World Press. All rights reserved. Source

Discover hidden collaborations