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A novel shape memory plate osteosynthesis for noninvasive modulation of fixation stiffness in a rabbit tibia osteotomy model

Müller, Christian W.; Pfeifer, Ronny; Meier, Karen; Decker, Sebastian; Reifenrath, Janin; Gösling, Thomas; Wesling, Volker; Krettek, Christian; Hurschler, Christof; Krämer, Manuel (New York, NY : Hindawi Publishing Corporation, 2015)

Nickel-titanium shape memory alloy (NiTi-SMA) implants might allow modulating fracture healing, changing their stiffness through alteration of both elastic modulus and cross-sectional shape by employing the shape memory ...
Advanced process design for re-contouring using a time-domain dynamic material removal simulation

Denkena, Berend; Pape, O.; Grove, T.; Mücke, A. (Amsterdam : Elsevier B.V., 2019)

The repair of components often requires the removal of excess weld material. This removal is considered as re-contouring. Re-contouring processes have to be designed individually for each case of damage to fulfil the high ...
Approach for Increasing the Resource Efficiency for the Production Process of Titanium Structural Components

Denkena, Berend; Jacob, Stefan (Amsterdam : Elsevier, 2015)

Titanium structural components for the aircraft industry are usually manufactured from ingots of primary material. The process chain for the fabrication of these components consists of the production of titanium sponge, ...
Approaches for an energy and resource efficient manufacturing in the aircraft industry

Denkena, Berend; Dittrich, M.-A.; Uhlich, F.; Wichmann, M. (Amsterdam : Elsevier B.V., 2019)

Over the recent years, several studies have pointed out the impact of manufacturing on the environment. Especially machining offers great potential for the conservation of energy, resources and the reuse of raw materials. ...
Ball end milling of titanium TIG weld material and the effect of SiC addition - Process forces and shape deviations

Denkena, Berend; Mücke, A.; Schumacher, T.; Langen, D.; Grove, T.; Bergmann, B.; Hassel, T. (Amsterdam : Elsevier B.V., 2018)

An increasing amount of blade integrated disks (Blisks) is used in turbine engines. These integrally milled components offer benefits regarding to their performance-to-weight ratio. However, in case of failure, partial ...
Cold sprayed WO3 and TiO2 electrodes for photoelectrochemical water and methanol oxidation in renewable energy applications

Haisch, Christoph; Schneider, Jenny; Fleisch, Manuel; Gutzmann, Henning; Klassen, Thomas; Bahnemann, Detlef W. (Cambridge : Royal Society of Chemistry, 2017)

Films prepared by cold spray have potential applications as photoanodes in electrochemical water splitting and waste water purification. In the present study cold sprayed photoelectrodes produced with WO3 (active under ...
Cyclic degradation of titanium-tantalum high-temperature shape memory alloys - The role of dislocation activity and chemical decomposition

Niendorf, T.; Krooß, P.; Somsen, C.; Rynko, R.; Paulsen, A.; Batyrshina, E.; Frenzel, J.; Eggeler, Gunther; Maier, Hans Jürgen (Singapore : World Scientific Publishing Co. Pte Ltd, 2015)

Titanium-tantalum shape memory alloys (SMAs) are promising candidates for actuator applications at elevated temperatures. They may even succeed in substituting ternary nickel-titanium high temperature SMAs, which are either ...
Effective passivation of crystalline silicon surfaces by ultrathin atomic-layer-deposited TiOx layers

Titova, V.; Veith-Wolf, B.; Startsev, D.; Schmidt, J. (London : Elsevier Ltd., 2017)

We characterize the surface passivation properties of ultrathin titanium oxide (TiOx) films deposited by atomic layer deposition (ALD) on crystalline silicon by means of carrier lifetime measurements. We compare different ...
Energy Efficiency in Machining of Aircraft Components

Denkena, Berend; Dittrich, Marc-André; Jacob, Stefan (Amsterdam : Elsevier, 2016)

High production costs and material removal rates characterize the manufacturing of aircraft components made of titanium. Due to competitive pressure, the manufacturing processes are highly optimized from an economical ...
Evaluation of functionalized porous titanium implants for enhancing angiogenesis in vitro

Roland, Laura; Backhaus, Samantha; Grau, Michael; Matena, Julia; Teske, Michael; Beyerbach, Martin; Escobar, Hugo Murua; Haferkamp, Heinz; Gellrich, Nils-Claudius; Nolte, Ingo (Basel : MDPI AG, 2016)

Implant constructs supporting angiogenesis are favorable for treating critically-sized bone defects, as ingrowth of capillaries towards the center of large defects is often insufficient. Consequently, the insufficient ...
Experimental middle ear surgery in rabbits: A new approach for reconstructing the ossicular chain

Stieve, M.; Hedrich, H.J.; Battmer, R.D.; Behrens, P.; Müller, P.; Lenarz, T. (London : SAGE Publications Ltd., 2009)

This experimental animal study aimed at evaluating a new prosthesis to replace the ossicular chain; we developed a new technique for surgical implantation into the middle ear of rabbits. The rabbit middle ear is, owing to ...
Functionality of laser-sintered shape memory micro-actuators

Dudziak, S.; Gieseke, M.; Haferkamp, H.; Barcikowski, S.; Kracht, D. (Amsterdam : Elsevier B.V., 2010)

NiTi shape memory alloys are considered to be difficult to machine. Dimensional accuracy can hardly be met especially in micro-machining. Being a non-contact tool and therefore independent from machining forces, the laser ...
In vitro evaluation of PCL and P(3HB) as coating materials for selective laser melted porous titanium implants

Grau, Michael; Matena, Julia; Teske, Michael; Petersen, Svea; Aliuos, Pooyan; Roland, Laura; Grabow, Niels; Escobar, Hugo Murua; Gellrich, Nils-Claudius; Haferkamp, Heinz; Nolte, Ingo (Basel : MDPI AG, 2017)

Titanium is widely used as a bone implant material due to its biocompatibility and high resilience. Since its Young's modulus differs from bone tissue, the resulting "stress shielding" could lead to scaffold loosening. ...
Investigation of chip formation of Ti–6Al–4V in oxygen-free atmosphere

Denkena, Berend; Bergmann, Benjamin; Schaper, Florian (London : Springer, 2023)

Titanium and titanium alloys have high strength at low density, good corrosion resistance and excellent biocompatibility. Therefore, the use of titanium materials is well established in high-performance applications such ...
Kinematic and stochastic surface topography of machined tial6v4-parts by means of ball nose end milling

Denkena, Berend; Böß, Volker; Nespor, D.; Samp, A. (Amsterdam : Elsevier BV, 2011)

Ball nose end mills are usually applied during 5-axes machining of high functional parts especially in the aerospace industry. The systematical study of the relationship between process forces and kinematics, surface ...
Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Dillert, Ralf; Engel, Astrid; Große, Julia; Lindner, Patrick; Bahnemann, Detlef W. (Cambridge : Royal Society of Chemistry, 2013)

Air pollution by nitrogen oxides represents a serious environmental problem in urban areas where numerous sources of these pollutants are concentrated. One approach to reduce the concentration of these air pollutants is ...
Medical prototyping using two photon polymerization

Narayan, Roger J.; Doraiswamy, Anand; Chrisey, Douglas B.; Chichkov, Boris (Amsterdam : Elsevier Science, 2010)

Two photon polymerization involves nearly simultaneous absorption of ultrashort laser pulses for selective curing of photosensitive material. This process has recently been used to create small-scale medical devices out ...
Mesoporous titania photocatalysts: Preparation, characterization and reaction mechanisms

Ismail, Adel A.; Bahnemann, Detlef W. (Cambridge : Royal Society of Chemistry, 2011)

Titanium dioxide is a very important semiconductor with a high potential for applications in photocatalysis, solar cells, photochromism, sensoring, and various other areas of nanotechnology. Increasing attention has recently ...
Microstructural evolution and functional fatigue of a Ti–25Ta high-temperature shape memory alloy

Maier, Hans Jürgen; Karsten, Elvira; Paulsen, Alexander; Langenkämper, Dennis; Decker, Peer; Frenzel, Jan; Somsen, Christoph; Ludwig, Alfred; Eggeler, Gunther; Niendorf, Thomas (Cambridge : Cambridge University Press, 2017)

Titanium–tantalum based alloys can demonstrate a martensitic transformation well above 100 °C, which makes them attractive for shape memory applications at elevated temperatures. In addition, they provide for good workability ...
Mineralogical Controls on the Ti Isotope Composition of Subduction Zone Magmas

Kommescher, S.; Kurzweil, F.; Fonseca, R.O.C.; Rzehak, L.J.A.; Hohl, S.V.; Kirchenbaur, M.; Schuth, S.; Sprung, P.; Münker, C. (Hoboken, NJ : Wiley, 2023)

The positive Ti isotope versus SiO2-content correlation in igneous rocks reflects the fractional crystallization of Ti-bearing oxide minerals. However, Ti isotope variations of subduction-related igneous rocks indicate ...

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