Advanced Engineering Materials

Cover image for Advanced Engineering Materials

Special Issue: Advanced Materials in Transportation / Materials For Health Care

July, 2010

Volume 12, Issue 7

Pages 557–652, B217–B338

Issue edited by: C. Badini, M. Busse, K. Kayvantash, D. Lehmhus, Ch. Linsmeier, Aldo R. Boccaccini

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Review
    7. Communications
    8. Editorial
    9. Research Articles
    10. Rapid Communication
    11. Research Articles
    12. Rapid Communication
    13. Research Articles
    1. (Adv. Eng. Mater. 7/2010)

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.201090017

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      Several small aluminium foam spheres, preferably bonded to each other using adhesives, make up APM particulate aluminium foams. The image shows some such spheres, one of them cut open to reveal the internal structure. Metal foams of this kind are easy to process and show improved reproducibility and adaptability of mechanical properties (image (c) Fraunhofer IFAM).

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Review
    7. Communications
    8. Editorial
    9. Research Articles
    10. Rapid Communication
    11. Research Articles
    12. Rapid Communication
    13. Research Articles
    1. (Adv. Eng. Mater. 7/2010)

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.201090018

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      The cover figure shows cytoskeleton and focal adhesion staining in human primary osteoblasts, which were cultured on samples.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Review
    7. Communications
    8. Editorial
    9. Research Articles
    10. Rapid Communication
    11. Research Articles
    12. Rapid Communication
    13. Research Articles
    1. (Adv. Eng. Mater. 7/2010)

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.201090019

  4. Editorial

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Review
    7. Communications
    8. Editorial
    9. Research Articles
    10. Rapid Communication
    11. Research Articles
    12. Rapid Communication
    13. Research Articles
    1. Natural Aging in Al-Mg-Si Alloys – A Process of Unexpected Complexity (pages 559–571)

      John Banhart, Cynthia Sin Ting Chang, Zeqin Liang, Nelia Wanderka, Matthew D. H. Lay and Anita J. Hill

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.201000041

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      Pure Al-Mg-Si alloys are naturally aged after solutionizing and quenching. Measurements of hardness, electrical resistivity, positron lifetime, thermoanalysis, and atom probe tomography suggest at least four different stages of solute and vacancy clustering and early precipitation. The observed correlations between natural pre-aging, artificial aging, and secondary aging allow for the discussion of solute dynamics in these alloys.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Review
    7. Communications
    8. Editorial
    9. Research Articles
    10. Rapid Communication
    11. Research Articles
    12. Rapid Communication
    13. Research Articles
    1. Ab Initio Guided Design of bcc Ternary Mg–Li–X (X = Ca, Al, Si, Zn, Cu) Alloys for Ultra-Lightweight Applications (pages 572–576)

      William Art Counts, Martin Friák, Dierk Raabe and Jörg Neugebauer

      Version of Record online: 11 MAY 2010 | DOI: 10.1002/adem.200900308

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      Ab initio calculations are employed to study bcc Mg–Li binary and MgLi-based ternaries. A fundamental materials-design limitation preventing an increase of both specific Young's modulus and ductility is found in Mg–Li binaries. In an attempt to bypass the limitation, MgLi–X ternaries (X = Ca, Al, Si, Cu, Zn) are studied but none of the five solutes is able to simultaneously improve both properties.

    2. Carbon Long Fiber Reinforced Aluminum Matrix Composites – Parameter Studies and Numerical Simulations of the Infiltration Process (pages 577–583)

      Heiko Ballmes, Alexander Klassen, Christian A. Rottmair and Robert F. Singer

      Version of Record online: 3 MAY 2010 | DOI: 10.1002/adem.200900316

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      Within this work, the development of a cost efficient and reliable production technique for infiltrating carbon fibers with aluminum using a conventional cold chamber die casting machine is reported. Results are presented that demonstrate the large potential of pressure die casting as a low cost manufacturing process for carbon fiber reinforced aluminum matrix composites. The influence of process parameters on the infiltration behaviour is investigated and compared to results gained by numerical simulation.

    3. Mechanical Properties of Compound Extruded Aircraft Stringer Profiles Under Cyclic Loading (pages 584–586)

      Kay A. Weidenmann, Eberhard Kerscher and Thilo Hammers

      Version of Record online: 6 APR 2010 | DOI: 10.1002/adem.200900327

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      The characterisation of compound extrusions based on aircraft aluminium alloys EN AW-6056 and EN AW-2099 shows that a good embedding of the reinforcing high strength wires can be achieved. Furthermore the mechanical properties under cyclic loading were measured and the S/N-curves for the different compound combinations were determined. Subsequently the crack initiation and propagation was analysed.

    4. Investigations into the Sealing of Heat Damaged Areas by Applying Polymer Powders During Laser Cutting of Carbon Fiber Reinforced Composites (pages 587–590)

      Peter Jaeschke, Dirk Herzog, Christian Noelke, Bjoern Henning and Heinz Haferkamp

      Version of Record online: 8 JUN 2010 | DOI: 10.1002/adem.200900310

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      Endless carbon fiber reinforced plastics are recognized as having the greatest lightweight construction potential of all materials. Fully automated process chains for the manufacturing of composite structures are needed in order to achieve production rates and cycle times required in many industrial sectors. In this paper, a new technique, based on the in situ sealing of the kerf during high power laser cutting by application of polymer powder is presented.

    5. Aluminum “Egg-Box” Panel as an Energy Absorber for Pedestrian Protection (pages 591–595)

      Sravanthi Nowpada, Efford C. Chirwa, Peter Myler and Emmanuel Matsika

      Version of Record online: 8 JUN 2010 | DOI: 10.1002/adem.201000054

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      This paper evaluates the quasi-static performance of lightweight aluminum “egg-box” energy absorber specifically designed to achieve increased energy absorption. To understand its collapse mechanism and the factors influencing the energy absorption thereof, compressive tests were conducted under similar test conditions on two single frusta: (i) constrained in situ and (ii) separated from the egg-box panel exposing the free–free edges. The energy absorbed in (ii) is 80% greater than in (i).

    6. Mechanical Characterization of Particulate Aluminum Foams—Strain-Rate, Density and Matrix Alloy versus Adhesive Effects (pages 596–603)

      Dirk Lehmhus, Joachim Baumeister, Lennart Stutz, Eduard Schneider, Karsten Stöbener, Massimiliano Avalle, Lorenzo Peroni and Marco Peroni

      Version of Record online: 8 JUN 2010 | DOI: 10.1002/adem.200900315

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      The present paper gives an overview of the mechanical properties of different grades of APM type particulate aluminum foams. Behavior both under quasi-static and dynamic loading conditions is considered. The influence of density on compressive response is quantitatively evaluated for the matrix alloy AlSi10, while the effect of the adhesive is qualitatively studied by comparing a brittle epoxy-based system with a ductile, thermoplastic PA.

    7. Syntactic Iron Foams with Integrated Microglass Bubbles Produced by Means of Metal Powder Injection Moulding (pages 604–608)

      Jörg Weise, Joachim Baumeister, Olga Yezerska, Natalie Salk and Gabriel Beltrame Derner Silva

      Version of Record online: 6 APR 2010 | DOI: 10.1002/adem.200900297

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      Pure iron (99%) foams with integrated microglass bubbles were produced by means of metal powder injection moulding (MIM) with variation of the glass bubble contents and characterized using density measurements, tensile and compression tests, metallographic sections, scanning electron microscopy, and corrosion tests.

    8. Microstructural Characteristics of an AZ91 Matrix-Glassy Carbon Particle Composite (pages 609–616)

      Anita Olszówka-Myalska, Jerzy Myalski and Agnieszka Botor-Probierz

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200900321

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      This paper presents the results of a microstructural investigation of a new type of ultralight glassy carbon particles/AZ91 magnesium alloy matrix composite manufactured by the powder metallurgy method. Glassy carbon particles with unmodified surfaces and surfaces modified with SiO2 amorphous nanocoating were used in the experiment. The composite microstructure, with an emphasis given on the interface, was characterized by SEM, TEM, and HRTEM microscopy.

    9. Oxidation Resistance of Multilayer SiC for Space Vehicle Thermal Protection Systems (pages 617–622)

      Claudia Milena Vega Bolivar, Andrea Antonini, Sara Biamino, Matteo Pavese, Paolo Fino and Claudio Badini

      Version of Record online: 7 APR 2010 | DOI: 10.1002/adem.200900328

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      The oxidation resistance of different kinds of SiC-based laminate produced by tape casting, stacking of the sheets in a multilayer structure, de-binding and sintering is investigated. Three kinds of specimens are tested: multilayer SiC with fully dense layers, multilayer SiC integrating porous layers, multilayer composites made by stacking SiC/Cf composite layers.

    10. Processing of Carbon Nanofiber Reinforced ZrB2 Matrix Composites for Aerospace Applications (pages 623–626)

      Jorge Barcena, Javier Coleto, Shi C. Zhang, Gregory E. Hilmas and William G. Fahrenholtz

      Version of Record online: 5 MAY 2010 | DOI: 10.1002/adem.200900307

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      Among ultra high temperature ceramics, zirconium diboride is a material of great interest for its use in reusable launch and hypersonic vehicles. Nevertheless its limited fracture toughness and thermal shock resistance are two of the main problems to overcome. Carbon nanofibers possess outstanding properties and their incorporation provides an opportunity to obtain composite materials with improved properties. The present work contains the processing description based on a tape casting procedure and a preliminary study of the sintering and the reaction of the nanofibers with the surface oxides present on the boride particles.

    11. Developments in Failure and Damage Modeling for UD, 2D, and 3D Composite Materials (pages 627–632)

      Lucio Raimondo, Lorenzo Iannucci and Paul Robinson

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200900338

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      The development of validated modeling tools for the simulation of fiber-reinforced composites subjected to complex loading conditions is justified by the increasing use of these materials by the transport industry. This paper outlines strategies for computationally efficient modeling of composites with increasing fiber architectural complexity. The proposed models are applicable to static and dynamic elastic modeling and failure and damage analysis for composites with UD, 2D, and 3D fiber architectures.

    12. Stress Concentration Factors and Weight Functions in Thin Notched Structures of Equibiaxial Anisotropic Materials (pages 633–636)

      Michael Heinzelmann and Alexander L. Kalamkarov

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200900305

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      For flat panels of equibiaxial anisotropic materials containing a central hole, stress concentration factors and weight functions were calculated using the finite element technique. The results show the stress concentration factors to be considerably larger and the weight functions to be considerably smaller than those in isotropic materials.

    13. In Situ Damage Detection With Acoustic Emission Analysis During Cyclic Loading of Wire Reinforced EN AW-6082 (pages 637–640)

      Kay André Weidenmann, Eberhard Kerscher and Matthias Merzkirch

      Version of Record online: 31 MAR 2010 | DOI: 10.1002/adem.200900313

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      To determine and locate damage evolution during cyclic loading of composite extruded spring steel reinforced EN AW-6082 matrix the acoustic emission analysis is used. It allows for getting more information about the damage mechanisms during fatigue of the matrix and the final failure of the reinforcing element. The current work also includes the determination of crack growth using strain measuring methods.

    14. Monitoring of Machining Processes Using Sensor Equipped Tools (pages 641–645)

      Ekkard Brinksmeier, Carsten Heinzel, Antje Wilkens, Walter Lang and Thomas Seedorf

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200900312

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      A new thin film thermocouple sensor concept, usable for grinding tool integration, is described in this paper. The unique feature of this sensor is the continuous contacting of the thermocouple through the grinding process inherent wear which leads to smearing of the thermoelectric layers and thus forming the measuring junction of a thermocouple.

    15. Automotive Material Sustainability Through Reversible Adhesives (pages 646–652)

      Allan R. Hutchinson, Patricia H. Winfield and Ryan H. McCurdy

      Version of Record online: 8 JUN 2010 | DOI: 10.1002/adem.200900331

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      This communication introduces the reader to existing systems for reversible adhesives and focuses on experimental data for two structural and one semi-structural automotive adhesive. Demonstrated reversibility is achieved by the inclusion of a thermally labile functional additive in the adhesive matrix. Comparative tests show how well each additive performs, and to what effect they have on specific mechanical properties.

  7. Editorial

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Review
    7. Communications
    8. Editorial
    9. Research Articles
    10. Rapid Communication
    11. Research Articles
    12. Rapid Communication
    13. Research Articles
    1. Biomimetic Carbonate–Hydroxyapatite Nanocrystals Prepared by Vapor Diffusion (pages B218–B223)

      Michele Iafisco, Jaime Gómez Morales, María Angeles Hernández-Hernández, Juan Manuel García-Ruiz and Norberto Roveri

      Version of Record online: 6 MAY 2010 | DOI: 10.1002/adem.201080003

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      Carbonate–hydroxyapatite nanocrystals have been produced by using the sitting drop vapor diffusion technique, for the first time. The method consists of diffusing gases from an aqueous solution of NH4HCO3 through drops containing an aqueous mixture of (CH3COO)2Ca and (NH4)2HPO4, in order to increase slowly their pH and to dope the precipitate with carbonate. This method is simple and controllable, and may prove to be suitable for the study of the interactions and/or the co-crystallization of hydroxyapatite with minute amounts of biomolecules, polymers or drugs.

    2. Medical Potentialities of Biomimetic Apatites through Adsorption, Ionic Substitution, and Mineral/Organic Associations: Three Illustrative Examples (pages B224–B233)

      Ahmed Al-Kattan, Farid Errassifi, Anne-Marie Sautereau, Stephanie Sarda, Pascal Dufour, Allal Barroug, Isabelle Dos Santos, Christele Combes, David Grossin, Christian Rey and Christophe Drouet

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200980084

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      Biomimetic apatites exhibit exceptional surface and bulk properties. We illustrate these aspects by way of three selected examples of adsorption and ion substitution in view of conveying new functionalities: the adsorption of risedronate ions on apatite is examined in relation with osteoporosis treatment, the substitution in apatite of some Ca2+ ions by Eu3+ is followed for exploring by FRET the apatite/collagen interface in biocomposites, and the possibility to control apatite agglomeration by surface functionalization with a phospholipid moiety is shown. Such results enable to foresee promising bio-medical applications, even beyond bone-related applications.

    3. Apatite Deposition on NaOH-Treated PEEK and UHMWPE Films for Sclera Materials in Artificial Cornea Implants (pages B234–B244)

      Monica Pino, Wojciech Chrzanowski, Derek Fabel, Mohammed Baklar, Natalie Stingelin and Kathleen E. Tanner

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200980088

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      The skirt of cornea implants needs to integrate with the sclera. Currently skirt materials lead to poor tissue integration and this can be improved by using a bioactive skirt material. We developed methodology to improve the bioactivity of PEEK and UHMWPE that are intended to be used as skirts. It was established that two step modification (i) chemical surface modification using NaOH with subsequent (ii) apatite film formation from SBF was an effective method to improve the bioactivity in vivo of the polymer films. We reported on the role of the modification on wettability, topography, and chemical stability of formed bioactive apatite layers.

    4. Quantitative Chemical Mapping of Relevant Trace Elements at Biomaterials/Biological Media Interfaces by Ion Beam Methods (pages B245–B255)

      Edouard Jallot, Olivier Raissle, Jeremy Soulie, Jonathan Lao, Geoffroy Guibert and Jean-Marie Nedelec

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.201080001

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      Throughout different examples, this paper reviews the interest of ion beams methods (PIXE/RBS) for the quantitative chemical characterization of biomaterials/biological medium interfaces. Chemical imaging of degradation products of knee metallic prostheses, of biomineralization of doped bioactive glasses and of proteins loaded in mesoporous hydroxyapatites are presented and discussed.

  9. Rapid Communication

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    4. Contents
    5. Editorial
    6. Review
    7. Communications
    8. Editorial
    9. Research Articles
    10. Rapid Communication
    11. Research Articles
    12. Rapid Communication
    13. Research Articles
    1. Monodisperse Mesoporous Silica Spheres Inside a Bioactive Macroporous Glass–Ceramic Scaffold (pages B256–B259)

      Renato Mortera, Francesco Baino, Gianluca Croce, Sonia Fiorilli, Chiara Vitale-Brovarone, Enrica Verné and Barbara Onida

      Version of Record online: 6 JUL 2010 | DOI: 10.1002/adem.200980075

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      In the field of bone tissue engineering, monosized MCM-41 spheres have been incorporated inside a bioactive glass–ceramic macroporous scaffold belonging to the SiO2–CaO–K2O (SCK) system so obtaining a multiscale hierarchical composite.

  10. Research Articles

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    5. Editorial
    6. Review
    7. Communications
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    10. Rapid Communication
    11. Research Articles
    12. Rapid Communication
    13. Research Articles
    1. The Influence of Tetracycline Loading on the Surface Morphology and Biocompatibility of Films Made from P(3HB) Microspheres (pages B260–B268)

      Lydia Francis, Decheng Meng, Ian C. Locke, Nicola Mordan, Vehid Salih, Jonathan C. Knowles, Aldo R. Boccaccini and Ipsita Roy

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.201080020

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      Tetracycline was encapsulated in microspheres made of poly(3-hydroxybutyric acid) P(3HB), a microbial biodegradable polymer isolated from Bacillus cereus SPV. The presence of the drug changed the surface morphology and increased the roughness of the films. The in vitro biocompatibility of the films was investigated using a human keratinocyte cell line (HaCaT). The percentage cell viability was greater on the drug loaded films. Thus, the above results illustrate that the drug loaded P(3HB) films, in addition to being a suitable matrix for drug delivery, represent an improved substrate for keratinocyte cell attachment.

    2. Co-Cultures of Primary Cells on Self-Supporting Nanoporous Alumina Membranes (pages B269–B275)

      Andreas Hoess, Annika Thormann, Andrea Friedmann, Hendryk Aurich and Andreas Heilmann

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.201080010

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      Self-supporting nanoporous alumina membranes can be used to establish indirect co-cultures of human adipose-derived mesenchymal stem cells (hASCs) and primary mouse hepatocytes. The cells grow independently of each other on both membrane sides (see figure), whereas a cell-to-cell communication is ensured by the diffusion of soluble molecules through the pores. Due to this interaction a hepatic differentiation of hASCs can be induced during co-cultivation under static culture conditions as well as under the continuous flow of culture media in a bioreactor.

    3. Chemical, Mechanical, and Antibacterial Properties of Silver Nanocluster–Silica Composite Coatings Obtained by Sputtering (pages B276–B282)

      Monica Ferraris, Sergio Perero, Marta Miola, Sara Ferraris, Giovanna Gautier, Giovanni Maina, Giacomo Fucale and Enrica Verne

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200980076

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      Silver nanocluster–silica matrix composite coatings have been deposited by radio frequency co-sputtering on silica substrates and thermally treated (150–600 °C). Field emission scanning electron microscopy and X-ray diffraction analyses revealed the presence of metal silver nanoclusters, their size depending on the heating treatment. The antibacterial activity has been demonstrated on samples heated up to 450 °C in contact mode and for samples heated at 600 °C in a liquid environment (as shown in figure). Silver leaching tests revealed an amount ranging from 0.1 to 0.9 μg mm−2, over 28 days. Tape and scratch tests revealed a good adhesion of the coatings on silica.

    4. Preparation and Characterization of Gallium Releasing 3-D Alginate Coated 45S5 Bioglass® Based Scaffolds for Bone Tissue Engineering (pages B283–B291)

      Viviana Mouriño, Phillipa Newby and Aldo R. Boccaccini

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200980078

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      Bioglass®-based scaffolds for bone tissue engineering (TE) exhibiting prophylaxis effect against infections were developed. The highly porous scaffolds were coated with sodium alginate crosslinked with Ga3+. The alginate coating does not affect the pore interconnectivity enhancing the scaffold structural integrity. The resulting composite scaffold exhibited antibacterial effect against S. aureus and high bioactivity being thus a promising candidate for bone TE.

    5. High Antibacterial and Antifungal Activity of Silver Monodispersed Nanoparticles Embedded in a Glassy Matrix (pages B292–B297)

      Leticia Esteban-Tejeda, Francisco Malpartida, Carlos Pecharromán and Jose Serafin Moya

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200980077

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      Silver doped glass powders have been obtained starting from vitellinate/nAg and montmorillonite/nAg. They have shown a high biocide activity against three different types of microorganisms: E. coli (gram-negative bacteria), M. luteus (gram-positive-bacteria), and I. orientalis (yeast). It was found that these glasses keep constant the silver concentration even below the cytotoxic limit. Therefore we interpret that silver doped glasses play the role of dosing devices.

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      Tailoring Cell Behavior on Polymers by the Incorporation of Titanium Doped Phosphate Glass Filler (pages B298–B308)

      Wojciech Chrzanowski, Ensanya A. Abou Neel, Koon-Y. Lee, Alexander Bismarck, Anne M. Young, Andrew D. Hart, Matthew J. Dalby and Jonathan C. Knowles

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200980083

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      Understanding tissue response to materials, modulation and guide tissue regeneration is one of the main challenges in biomaterials science. In our studies we demonstrated that titanium doped phosphate glass when used as polymer (PLDL) filler improved significantly bone cell response when compared with β-TCP filler. Improvement of both cytoskeleton organization and protein expression was observed for glass filled polymer.

    7. Surface Activation of a Ferrimagnetic Glass–Ceramic for Antineoplastic Drugs Grafting (pages B309–B319)

      Enrica Vernè, Marta Miola, Sara Ferraris, Claudia L. Bianchi, Alberto Naldoni, Giovanni Maina and Oana Bretcanu

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200980082

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      A ferrimagnetic glass–ceramic containing magnetite crystals has been studied as potential carrier for antineoplastic agents, in order to exploit the combination of hyperthermia and chemotherapy. The material surface was functionalized in order to bind two different anticancer drugs: cisplatinum and doxorubicin. The drugs released after 1 day of uptake at 37 °C have a randomly distributed kinetics trend.

  11. Rapid Communication

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Review
    7. Communications
    8. Editorial
    9. Research Articles
    10. Rapid Communication
    11. Research Articles
    12. Rapid Communication
    13. Research Articles
    1. Fabrication of Load-Bearing NiTi Scaffolds for Bone Ingrowth by Ni Foam Conversion (pages B320–B325)

      Irena Gotman

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.201080006

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      Highly porous NiTi scaffolds for bone ingrowth were fabricated by reactive conversion (PIRAC) of commercially available Ni foams. These open cell ‘trabecular NiTi’ scaffolds possess high strength and ductility and exhibit low Ni ion release. PIRAC deposition of a thin titanium nitride (TiN) layer further improves the corrosion characteristics of “trabecular NiTi” and allows for material bioactivation by alkali treatment or biomimetic Ca phosphate deposition.

  12. Research Articles

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Review
    7. Communications
    8. Editorial
    9. Research Articles
    10. Rapid Communication
    11. Research Articles
    12. Rapid Communication
    13. Research Articles
    1. Short-Range Structure of Yttrium Alumino-Silicate Glass for Cancer Radiotherapy: Car–Parrinello Molecular Dynamics Simulations (pages B326–B330)

      Jamieson K. Christie and Antonio Tilocca

      Version of Record online: 30 JUL 2010 | DOI: 10.1002/adem.200980081

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      Car–Parrinello molecular dynamics (CPMD) simulations are employed to reveal the atomistic structure of yttrium alumino-silicate (YAS) glass, employed in in situ cancer radiotherapy. The analysis focuses on the short-range environment of Si, Al, and Y, and shows that the disordered but rigid alumino-silicate network is broken by yttrium ions, which are found in a rather broad array of coordination environments, comprising between 5 and 8 oxide ions. The picture shows a model of the YAS glass extracted from the CPMD run; silicon, aluminum, yttrium, and oxygen atoms are represented as white, grey, large grey, and small black spheres respectively.

    2. An Ab Initio Molecular Dynamics Study of Bioactive Phosphate Glasses (pages B331–B338)

      Emilia Tang, Devis Di Tommaso and Nora H. de Leeuw

      Version of Record online: 22 JUL 2010 | DOI: 10.1002/adem.201080011

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      First principles molecular dynamics simulations of ternary phosphate-based glasses P2O5[BOND]CaO[BOND]Na2O (PBGs) have been carried out in order to provide an accurate description of the local structure and properties of these important materials for biomedical applications. The analysis of the structure of the glasses at room temperature shows the prevalence of the metaphosphate Q2 and pyrophosphate Q1 species. Calculation of the pair and angular distribution functions suggests that the rigidity of the phosphate tetrahedral glass network increases with the concentration of calcium, an observation which is interpreted in terms of the tendency of Ca2+ to be a stronger coordinator than sodium.

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