Publications
219 results found
Boix M, Eslava S, Machado GC, et al., 2015, ATR-FTIR measurements of albumin and fibrinogen adsorption: Inert versus calcium phosphate ceramics, JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A, Vol: 103, Pages: 3493-3502, ISSN: 1549-3296
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- Citations: 10
Ni N, Barg S, Garcia-Tunon E, et al., 2015, Understanding Mechanical Response of Elastomeric Graphene Networks, Scientific Reports, Vol: 5, ISSN: 2045-2322
Ultra-light porous networks based on nano-carbon materials (such as graphene or carbon nanotubes) have attracted increasing interest owing to their applications in wide fields from bioengineering to electrochemical devices. However, it is often difficult to translate the properties of nanomaterials to bulk three-dimensional networks with a control of their mechanical properties. In this work, we constructed elastomeric graphene porous networks with well-defined structures by freeze casting and thermal reduction, and investigated systematically the effect of key microstructural features. The porous networks made of large reduced graphene oxide flakes (>20 μm) are superelastic and exhibit high energy absorption, showing much enhanced mechanical properties than those with small flakes (<2 μm). A better restoration of the graphitic nature also has a considerable effect. In comparison, microstructural differences, such as the foam architecture or the cell size have smaller or negligible effect on the mechanical response. The recoverability and energy adsorption depend on density with the latter exhibiting a minimum due to the interplay between wall fracture and friction during deformation. These findings suggest that an improvement in the mechanical properties of porous graphene networks significantly depend on the engineering of the graphene flake that controls the property of the cell walls.
Wang D, Romer F, Connell L, et al., 2015, Highly flexible silica/chitosan hybrid scaffolds with oriented pores for tissue regeneration, Journal of Materials Chemistry B, Vol: 3, Pages: 7560-7576, ISSN: 2050-7518
Inorganic/organic sol–gel hybrids have nanoscale co-networks of organic and inorganic components that give them the unique potential of tailored mechanical properties and controlled biodegradation in tissue engineering applications. Here, silica/chitosan hybrid scaffolds with oriented structures were fabricated through the sol–gel method with a unidirectional freeze casting process. 3-Glycidoxypropyl trimethoxysilane (GPTMS) was used to obtain covalent inorganic/organic coupling. Process variables were investigated such as cooling rate, GPTMS and inorganic content, which can be used to tailor the mechanical properties and hybrid chemical coupling. Structural characterization and dissolution tests confirmed the covalent cross-linking of the chitosan and the silica network in hybrids. The scaffolds had a directional lamellar structure along the freezing direction and a cellular morphology perpendicular to the freezing direction. Compression testing showed that the scaffolds with 60 wt% organic were flexible and elastomeric perpendicular to the freezing direction whilst behaving in an elastic-brittle fashion parallel to the freezing direction. The compressive strengths are about one order of magnitude higher in the latter direction reaching values of the order of 160 kPa. This behaviour provides potential for clinicians to be able to squeeze the materials to fit tissue defect sites while providing some mechanical support from the other direction.
Al Nasiri N, Ni N, Saiz E, et al., 2015, Effect of microstructure and grain boundary chemistry on slow crack growth in silicon carbide at ambient conditions, Journal of the European Ceramic Society, Vol: 35, Pages: 2253-2260, ISSN: 0955-2219
Silicon carbide (SiC) is being used increasingly as a room temperature structural material in environments where moisture cannot always be excluded. Unfortunately, there have been almost no reports on slow crack growth (SCG) in SiC at room temperature. To address this gap, SCG in SiC was studied using constant stress rate and double torsion tests in water. SiC based materials were produced with a wide range of grain boundary chemistries and microstructures, which may affect their slow crack growth behaviour. To clarify the role of chemistry and microstructure respectively, solid state (SS) sintering with carbon and boron along with liquid phase (LP) sintering using oxides additives were used to produce materials with fine and coarse grains. The LP-SiC was three times more sensitive to SCG than SS-SiC materials. Moreover, the larger grained material with a higher toughness was less sensitive to SCG than the materials with fine grains.
Rodriguez-Florez N, Garcia-Tunon E, Mukadam Q, et al., 2015, An Investigation of the Mineral in Ductile and Brittle Cortical Mouse Bone, JOURNAL OF BONE AND MINERAL RESEARCH, Vol: 30, Pages: 786-795, ISSN: 0884-0431
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- Citations: 45
Garcia-Tunon E, Barg S, Franco J, et al., 2015, Printing in three dimensions with graphene, Advanced Materials, Vol: 27, Pages: 1688-1693, ISSN: 1521-4095
Responsive graphene oxide sheets form non‐covalent networks with optimum rheological properties for 3D printing. These networks have shear thinning behavior and sufficiently high elastic shear modulus (G′) to build self‐supporting 3D structures by direct write assembly. Drying and thermal reduction leads to ultra‐light graphene‐only structures with restored conductivity and elastomeric behavior.
Al Nasiri N, Saiz E, Giuliani F, et al., 2015, Effect of microstructure and slow crack growth on lifetime prediction of monolithic silicon carbide, Materials Science and Engineering A - Structural Materials Properties Microstructure and Processing, Vol: 627, Pages: 290-295, ISSN: 0921-5093
Menzel R, Barg S, Miranda M, et al., 2015, Joule Heating Characteristics of Emulsion-Templated Graphene Aerogels, ADVANCED FUNCTIONAL MATERIALS, Vol: 25, Pages: 28-35, ISSN: 1616-301X
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- Citations: 97
Wegst UGK, Bai H, Saiz E, et al., 2015, Bioinspired structural materials, NATURE MATERIALS, Vol: 14, Pages: 23-36, ISSN: 1476-1122
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- Citations: 2812
Varanasi VG, Russias J, Saiz E, et al., 2015, NOVEL PLA- AND PCL-HA POROUS 3D SCAFFOLDS PREPARED BY ROBOCASTING FACILITATE MC3T3-E1 SUBCLONE 4 CELLULAR ATTACHMENT AND GROWTH, Next Generation Biomaterials and Surface Properties of Biomaterials Symposia during the Materials Science and Technology Conference and Exhibition (MS and T), Publisher: JOHN WILEY & SONS INC, Pages: 175-186, ISSN: 1042-1122
Barg S, Perez FM, Ni N, et al., 2014, Mesoscale assembly of chemically modified graphene into complex cellular networks, Nature Communications, Vol: 5, Pages: 1-10, ISSN: 2041-1723
The widespread technological introduction of graphene beyond electronics rests on our ability to assemble this two-dimensional building block into three-dimensional structures for practical devices. To achieve this goal we need fabrication approaches that are able to provide an accurate control of chemistry and architecture from nano to macroscopic levels. Here, we describe a versatile technique to build ultralight (density ≥1 mg cm−3) cellular networks based on the use of soft templates and the controlled segregation of chemically modified graphene to liquid interfaces. These novel structures can be tuned for excellent conductivity; versatile mechanical response (elastic-brittle to elastomeric, reversible deformation, high energy absorption) and organic absorption capabilities (above 600 g per gram of material). The approach can be used to uncover the basic principles that will guide the design of practical devices that by combining unique mechanical and functional performance will generate new technological opportunities.
Wong LLC, Barg S, Menner A, et al., 2014, Macroporous polymer nanocomposites synthesised from high internal phase emulsion templates stabilised by reduced graphene oxide, POLYMER, Vol: 55, Pages: 395-402, ISSN: 0032-3861
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- Citations: 37
Ni N, Kaufmann Y, Kaplan WD, et al., 2014, Interfacial energies and mass transport in the Ni(Al)–Al2O3 system: The implication of very low oxygen activities, Acta Materialia, Vol: 64, Pages: 282-296, ISSN: 1359-6454
Fu Q, Saiz E, Rahaman MN, et al., 2013, Toward Strong and Tough Glass and Ceramic Scaffolds for Bone Repair, ADVANCED FUNCTIONAL MATERIALS, Vol: 23, Pages: 5461-5476, ISSN: 1616-301X
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- Citations: 167
Houmard M, Fu Q, Genet M, et al., 2013, On the structural, mechanical, and biodegradation properties of HA/β-TCP robocast scaffolds, JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS, Vol: 101, Pages: 1233-1242, ISSN: 1552-4973
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- Citations: 78
Genet M, Houmard M, Eslava S, et al., 2013, A two-scale Weibull approach to the failure of porous ceramic structures made by robocasting: Possibilities and limits (vol 33, pg 679, 2013), JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 33, Pages: 1393-1393, ISSN: 0955-2219
Garcia-Tunon E, Barg S, Bell R, et al., 2013, Designing Smart Particles for the Assembly of Complex Macroscopic Structures, Angewandte Chemie-International Edition
Walter C, Barg S, Ni N, et al., 2013, A novel approach for the fabrication of carbon nanofibre/ceramic porous structures, Journal of the European Ceramic Society
Kim H, Saiz E, Chhowalla M, et al., 2013, Modeling of the self-limited growth in catalytic chemical vapor deposition of graphene, NEW JOURNAL OF PHYSICS, Vol: 15, ISSN: 1367-2630
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- Citations: 43
Wong LLC, Barg S, Menner A, et al., 2013, Graphene oxide macroporous polymer foam nanocomposites synthesised via emulsion templating, 245th National Spring Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Genet M, Houmard M, Eslava S, et al., 2013, A two-scale Weibull approach to the failure of porous ceramic structures made by robocasting: Possibilities and limits, J. Eur. Ceram. Soc., Vol: 33, Pages: 679-688
Huang J, Ten E, Liu G, et al., 2013, Biocomposites of pHEMA with HA/β-TCP (60/40) for bone tissue engineering: Swelling, hydrolytic degradation, and <i>in vitro</i> behavior, POLYMER, Vol: 54, Pages: 1197-1207, ISSN: 0032-3861
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- Citations: 24
Huang J, Zhao D, Dangaria SJ, et al., 2013, Combinatorial design of hydrolytically degradable, bone-like biocomposites based on PHEMA and hydroxyapatite, POLYMER, Vol: 54, Pages: 909-919, ISSN: 0032-3861
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- Citations: 25
Garcia-Tunon E, Franco J, Eslava S, et al., 2013, Synthesis and optimization of the production of millimeter-size hydroxyapatite single crystals by Cl--OH- ion exchange, J. Am. Ceram. Soc., Vol: 96, Pages: 759-765
Saiz E, Zimmermann EA, Lee JS, et al., 2013, Perspectives on the role of nanotechnology in bone tissue engineering, DENTAL MATERIALS, Vol: 29, Pages: 103-115, ISSN: 0109-5641
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- Citations: 95
Tomsia AP, Lee JS, Wegst UGK, et al., 2013, Nanotechnology for Dental Implants, INTERNATIONAL JOURNAL OF ORAL & MAXILLOFACIAL IMPLANTS, Vol: 28, Pages: E535-E546, ISSN: 0882-2786
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- Citations: 27
Eslava S, Zhang L, Vanstreels K, et al., 2012, Metal-organic framework ZIF-8 as low-k dielectrics in microelectronics, Chemistry of Materials, Vol: 25, Pages: 27-33
Garcia-Tunon E, Couceiro R, Franco J, et al., 2012, Synthesis and characterisation of large chlorapatite single-crystals with controlled morphology and surface roughness, JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE, Vol: 23, Pages: 2471-2482, ISSN: 0957-4530
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- Citations: 14
Esteban-Tejeda L, Cabal B, Malpartida F, et al., 2012, Soda-lime glass-coating containing silver nanoparticles on Ti-6Al-4V alloy, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 32, Pages: 2723-2729, ISSN: 0955-2219
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- Citations: 13
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