Advanced Engineering Materials

Cover image for Vol. 14 Issue 6

June 2012

Volume 14, Issue 6

Pages 355–415, B293–B364

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Editorial
    8. Invited Review
    9. Research Articles
    10. Rapid Communications
    1. Front Cover Advanced Engineering Materials 6/2012

      Grzegorz Pyka, Andrzej Burakowski, Greet Kerckhofs, Maarten Moesen, Simon Van Bael, Jan Schrooten and Martine Wevers

      Version of Record online: 6 JUN 2012 | DOI: 10.1002/adem.201290022

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      SLM is a direct AM technique that can be used to produce micro-porous structures with global morphological properties that are highly controlled through robust computer design. Despite these advantages, some AM techniques still hold several functional constraints, resulting from present technical device limits and consequently the inability to control surface morphology at a microscale level. A novel protocol for surface modification of 3D titanium alloy-based open porous structures is developed, applying a combination of chemical etching (CHE) and electrochemical polishing (ECP) using HF-based solutions. This protocol achieves a significant and controllable roughness reduction and homogenisation of 3D additive manufactured Ti6Al4V open porous structures. Further details can be found in the article by G. Pyka et.al. on page 363.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Editorial
    8. Invited Review
    9. Research Articles
    10. Rapid Communications
    1. Cover Advanced Biomaterials 4/2012

      Version of Record online: 6 JUN 2012 | DOI: 10.1002/adem.201290023

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      The cover shows a selection of Advanced Biomaterial covers frome the last years.

  3. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Editorial
    8. Invited Review
    9. Research Articles
    10. Rapid Communications
    1. Adv. Eng. Mater. 6/2012

      Version of Record online: 6 JUN 2012 | DOI: 10.1002/adem.201290024

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Editorial
    8. Invited Review
    9. Research Articles
    10. Rapid Communications
    1. Adv. Eng. Mater. 6/2012 (pages 355–360)

      Version of Record online: 6 JUN 2012 | DOI: 10.1002/adem.201290021

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Editorial
    8. Invited Review
    9. Research Articles
    10. Rapid Communications
    1. Surface Modification of Ti6Al4V Open Porous Structures Produced by Additive Manufacturing (pages 363–370)

      Grzegorz Pyka, Andrzej Burakowski, Greet Kerckhofs, Maarten Moesen, Simon Van Bael, Jan Schrooten and Martine Wevers

      Version of Record online: 17 APR 2012 | DOI: 10.1002/adem.201100344

      Thumbnail image of graphical abstract

      A novel protocol for surface modification of 3D titanium alloy-based open porous structures is developed, applying a combination of chemical etching (CHE) and electrochemical polishing (ECP) using HF-based solutions. This protocol achieves a significant and controllable roughness reduction and homogenization of 3D additive manufactured Ti6Al4V open porous structures.

    2. Ti Coatings with Macropores for Improved Implant Fixation Obtained by Electrophoretic Deposition of TiH2 Stabilized Emulsions (pages 371–376)

      Tina Mattheys, Annabel Braem, Bram Neirinck, Omer Van der Biest and Jozef Vleugels

      Version of Record online: 20 JAN 2012 | DOI: 10.1002/adem.201100250

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      Electrophoretic deposition of TiH2 stabilized emulsions and subsequent vacuum sintering is used to coat Ti6Al4V substrates with a macroporous Ti coating. The emulsion template introduces macropores in the Ti coating which provide the needed volume for bone ingrowth. It is shown that the morphology of the coating such as size of the macropores, open porosity, and thickness is easily adapted by tuning the processing parameters.

    3. Thermal Treatment Optimization of Electrodeposited Hydroxyapatite Coatings on Ti6Al4V Substrate (pages 377–382)

      Richard Drevet, Joël Fauré and Hicham Benhayoune

      Version of Record online: 30 MAR 2012 | DOI: 10.1002/adem.201100331

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      Thermal behavior of an electrodeposited hydroxyapatite (HAP) coating on a Ti6Al4V substrate was investigated in order to define an optimal treatment temperature. Due to substrate oxidation we defined a 550 °C optimal temperature. At this optimal temperature we obtained a 50% crystalline bioactive HAP coating with an adhesion value (16.5 ± 0.9 MPa) in good agreement with the international standard ISO 13779-4.

    4. Hydrogen Sintering of Titanium to Produce High Density Fine Grain Titanium Alloys (pages 383–387)

      Zhigang Zak Fang, Pei Sun and Hongtao Wang

      Version of Record online: 4 APR 2012 | DOI: 10.1002/adem.201100269

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      A novel process—hydrogen sintering and phase transformation (HSPT)—for sintering Ti powder in hydrogen is studied in this paper. By controlling the eutectoid phase transformation and the subsequent dehydrogenation process, near-fully dense Ti material with very fine microstructure can be obtained in as-sintered state, without resorting to thermomechanical working. This approach provides a promising route for producing PM Ti materials with superior mechanical properties at low cost.

    5. Effect of SiC-Reinforcement and Equal-Channel Angular Pressing on Microstructure and Mechanical Properties of AA2017 (pages 388–393)

      Swetlana Wagner, Steve Siebeck, Matthias Hockauf, Daisy Nestler, Harry Podlesak, Bernhard Wielage and Martin F.-X. Wagner

      Version of Record online: 20 MAR 2012 | DOI: 10.1002/adem.201100253

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      This article deals with powder metallurgical production and property modification of a composite based on an Al–Cu alloy. Our approach makes use of hardening by precipitates, particles, dislocations, and grain boundaries. The incorporation of ceramic particles into an ultrafine-grained microstructure leads to an improvement of ultimate tensile strength by almost 300 MPa. A subsequent heat treatment can further increase strength; this can be related to changes in the defect structure.

    6. Improving Contour Accuracy and Strength of Reactive Air Brazed (RAB) Ceramic/Metal Joints by Controlling Interface Microstructure (pages 394–399)

      Chichi Li, Bernd Kuhn, Jörg Brandenberg, Tilmann Beck, Lorenz Singheiser, Kirsten Bobzin, Nazlim Bagcivan and Nils Kopp

      Version of Record online: 9 FEB 2012 | DOI: 10.1002/adem.201100274

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      Reactive air brazing (RAB) as a novel brazing method for metal/ceramic joints were being developed to achieve advanced brazing properties. Fracture resistance, contour accuracy, and wetting behavior of the brazed joints using three different Ag-based filler alloys were examined and compared. AgAl filler material exhibit the most promising mechanical properties and contour accuracy.

    7. Densification Behavior and Wear Response of Spark Plasma Sintered Iron-Based Bulk Amorphous Alloys (pages 400–407)

      Ashish Singh, Sameer R. Paital, Abhinay Andapally, Narendra B. Dahotre and Sandip P. Harimkar

      Version of Record online: 15 FEB 2012 | DOI: 10.1002/adem.201100322

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      Spark plasma sintering (SPS) process was used to sinter Fe-based bulk amorphous alloys from starting amorphous powder. The sintered discs were annealed at 700 and 800 °C to study the crystallization behavior and its influence on mechanical behavior. The partial devitrification resulted in increase in microhardness and wear resistance.

    8. Optimizing Thermal Shock Resistance of Layered Refractories (pages 408–415)

      Jarno Hein and Meinhard Kuna

      Version of Record online: 22 FEB 2012 | DOI: 10.1002/adem.201100283

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      Layered ceramic structures are often suggested to increase the thermal shock resistance. Here, a finite difference method (FDM) is used for solving the heat conduction problem with spatial varying material parameters. To optimize the structure, a new method is developed, which combines and sequences Monte Carlo simulations and evolution strategies to overcome certain disadvantages of both techniques.

  6. Editorial

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Editorial
    8. Invited Review
    9. Research Articles
    10. Rapid Communications
  7. Invited Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Editorial
    8. Invited Review
    9. Research Articles
    10. Rapid Communications
    1. Controlled Release of Antiproliferative Drugs From Polymeric Systems for Stent Applications and Local Cancer Treatment (pages B294–B310)

      Amir Kraitzer and Meital Zilberman

      Version of Record online: 16 MAY 2012 | DOI: 10.1002/adem.201180088

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      Restenosis and cancer are two different pathologies that have drawn extensive research attention over the years. Antiproliferative drugs inhibit cell proliferation and are therefore effective in the treatment of cancer as well as restenosis. The present review describes recent advances in systems for controlled release of antiproliferative drugs.

  8. Research Articles

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Editorial
    8. Invited Review
    9. Research Articles
    10. Rapid Communications
    1. Application of a Bioactive Coating on Resorbable, Neodymium Containing Magnesium Alloys, and Analyses of their Effects on the In Vitro Degradation Behavior in a Simulated Body Fluid (pages B311–B321)

      Jan-Marten Seitz, Ulrike Bormann, Kelly Collier, Eric Wulf, Rainer Eifler and Friedrich Wilhelm Bach

      Version of Record online: 10 FEB 2012 | DOI: 10.1002/adem.201180078

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      The aims of the present study are twofold: to investigate parameters for applying a bioactive SiO2–CaO–P2O5 coating, which shows promise of improved cell compatibility, onto the resorbable magnesium alloys Nd2 and LANd442, and also to determine the effects of a bioactive coating on the alloy's degradation and associated strength. Both alloys are currently of interest in the field of biomedical engineering since they present diverse corrosive characteristics and are therefore capable of best showing the impact on their degradation rates.

    2. Synthesis, Characterization and Bioactivity Evaluation of Porous Barium Titanate with Nanostructured Hydroxyapatite Coating for Biomedical Application (pages B322–B329)

      Hoda Zarkoob, Saeed Ziaei-Rad, Mohammadhossein Fathi and Hossein Dadkhah

      Version of Record online: 22 FEB 2012 | DOI: 10.1002/adem.201180091

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      In this study, a new bone graft composite, porous barium titanate (BT) with nanostructured hydroxyapatite (HA) coating is prepared. Analyses show that the HA coating has a nanostructure with crystallite size of 20–30 nm. The in vitro bioactivity tests of the prepared composites show that the nanostructured HA coating would improve the bioactivity of BT foam.

    3. Novel Biodegradable and Biocompatible Poly(3-hydroxyoctanoate)/Bacterial Cellulose Composites (pages B330–B343)

      Pooja Basnett, Jonathan C. Knowles, Fatemah Pishbin, Caroline Smith, Tajalli Keshavarz, Aldo R. Boccaccini and Ipsita Roy

      Version of Record online: 16 MAY 2012 | DOI: 10.1002/adem.201180076

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      Novel P(3HO)/bacterial cellulose composites have been developed to be used as a potential material for a range of medical applications including the development of biodegradable stents. The composites have been thoroughly characterized with respect to their chemical, mechanical, thermal, and surface properties. Cell proliferation studies have hence been carried out using human microvascular endothelial cell line (HMEC-1) over a period of 1, 4, and 7 days. As seen in the figure, the composites show excellent biocompatibility and increased cell growth and proliferation as compared to the neat P(3HO) film.

  9. Rapid Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Editorial
    8. Invited Review
    9. Research Articles
    10. Rapid Communications
    1. From Bioconjugation to Self-Assembly in Nanobiotechnology: Quantum Dots Trapped and Stabilized by Toroid Protein Yoctowells (pages B344–B350)

      Andreas Schreiber, Ying Yuan, Matthias C. Huber, Ralf Thomann, Andreas Ziegler, Helmut Cölfen, Jörn Dengjel, Michael Krüger and Stefan M. Schiller

      Version of Record online: 16 MAY 2012 | DOI: 10.1002/adem.201180083

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      Conjugation of proteins with quantum dots (QDs) ranging from 2.5 up to 9.5 nm with Hcp1, a hexameric core protein of Pseudomonas aeruginosa, is described. Defined structures ranging from single QDs trapped within the protein yoctowell cavity over multi-toroid architectures to photonic wires of up to 850 nm in length and 9 nm in width are self-assembled conserving the photoluminescence intensity of the QDs in aqueous solution for more than 3 month.

    2. PCL Nanopillars Versus Nanofibers: A Contrast in Progenitor Cell Morphology, Proliferation, and Fate Determination (pages B351–B356)

      Ashok Prasad, Dustin Berger and Ketul Popat

      Version of Record online: 13 MAR 2012 | DOI: 10.1002/adem.201180086

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      Long-term progenitor cell response to nanotopography was investigated using PCL nanopillar and nanofiber surfaces. MSCs on nanofibers exhibit better adherence, increased proliferation, and maintain increasingly dense fibroblast-like morphologies. In contrast, MSCs on nanopillar surfaces display lowered adherence, reduced proliferation, highly elongated morphologies, and show positive indications of surface induced osteogenesis.

    3. In Vivo Performance and Structural Relaxation of Biodegradable Bone Implants Made from Mg[BOND]Zn[BOND]Ca Bulk Metallic Glasses (pages B357–B364)

      Victor Wessels, Gwénaël Le Mené, Stefan F. Fischerauer, Tanja Kraus, Annelie-Martina Weinberg, Peter J. Uggowitzer and Jörg F. Löffler

      Version of Record online: 19 MAR 2012 | DOI: 10.1002/adem.201180200

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      Mg–Zn–Ca bulk metallic glasses are promising materials for biodegradable implants in osteosynthesis. Here we present an in vivo study of the performance (hydrogen evolution, volume reduction, and bone–implant contact) of implants made from these glasses, such as that shown for Mg67Zn28Ca5, which degraded after supporting a stabilizing bone layer. An analysis of room temperature aging of these metastable materials is also presented.

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