12 results match your criteria Advanced Engineering Materials[Journal]

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Characterization of Ultralow Density Cellular Solids: Lessons from 30 years of Bone Biomechanics Research.

Adv Eng Mater 2021 Jul 20;23(7). Epub 2021 Mar 20.

Department of Materials Science and Engineering, Cornell University, Ithaca, NY.

Advances in additive manufacturing techniques have enabled the development of micro-architectured materials displaying a combination of low-density and lightweight structures with high specific strength and toughness. The mechanical performance of micro-architectured materials can be assessed using standard techniques; however, when studying low- and ultralow density micro-architectured materials, standard characterization techniques can be subject to experimental artifacts. Additionally, quantitative assessment and comparisons of microarchitectures with distinct lattice patterns is not always straightforward. Read More

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Rapid Fabrication of Sterile Medical Nasopharyngeal Swabs by Stereolithography for Widespread Testing in a Pandemic.

Adv Eng Mater 2020 Oct 21:2000759. Epub 2020 Oct 21.

Fibers and Additive Manufacturing Enabled Systems Laboratory Department of Intelligent Systems Engineering Indiana University Multidisciplinary Engineering & Sciences Hall, 2425 North Milo B. Sampson Lane Bloomington IN 47408 USA.

The 3D printing of nasopharyngeal swabs during the COVID-19 pandemic presents a central case of how to efficiently address a break in the global supply chain of medical equipment. Herein a comprehensive study of swab design considerations for mass production by stereolithography is presented. The retention and comfort performance of a range of novel designs of 3D-printed swabs are compared with the standard flocked-head swab used in clinical environments. Read More

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October 2020

Microporous drug-eluting large silk particles through cryo-granulation.

Adv Eng Mater 2019 Jul 18;21(7). Epub 2019 Apr 18.

Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States.

A facile method for the preparation of large, microporous, drug-loaded particles is presented. High shear bollus injections of silk with cross-linker and drug colloids into super-cooled hexane were utilized to trigger phase separation of silk droplets, followed by immediate freezing at -60°C. A subsequent -20°C freeze-thaw of the frozen droplets resulted in self-assembly (crystallization) of the silk. Read More

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Obfuscation of Embedded Codes in Additive Manufactured Components for Product Authentication.

Adv Eng Mater 2019 08 23;21(8). Epub 2019 Apr 23.

Department, Composite Materials and Mechanics Laboratory, Mechanical and Aerospace Engineering New York University, Tandon School of Engineering, 6 MetroTech Center, Brooklyn, NY 11201, USA.

Enhancement in the capabilities of additive manufacturing (AM) methods has led to development of many high-value components for aerospace, automotive and medical fields. Security concerns, such as (a) a predominantly cloud based process chain of AM may be breached and stolen files can be used for unauthorized reproduction of parts and (b) legitimately acquired parts can be reverse engineered, need to be addressed for this field to protect intellectual property and deter counterfeiting or unauthorized production. In the present work, a method of embedding an identification code inside the parts manufactured by AM methods is presented, which takes advantage of the layer-by-layer manufacturing process. Read More

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Understanding and Improving Mechanical Properties in 3D printed Parts Using a Dual-Cure Acrylate-Based Resin for Stereolithography.

Adv Eng Mater 2018 Dec 20;20(12). Epub 2018 Sep 20.

Department of Electrical Computer and Energy Engineering University of Colorado Boulder Boulder, CO 80309, USA.

Application of 3D printed structures via stereolithography (SLA) is limited by imprecise dimensional control and inferior mechanical properties. These challenges is attributed to poor understanding ofpolymerization behavior during the printing process and inadequate post-processing methods. The former via a modified version of Jacob's working curve equation that incorporates the resin's sub-linear response to irradiation intensity is addressed by the authors. Read More

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December 2018

Mechanical Properties of Graphene Foam and Graphene Foam - Tissue Composites.

Adv Eng Mater 2018 Sep 25;20(9). Epub 2018 Jun 25.

Micron School of Materials Science and Engineering, Boise State University, 1910 University Dr., Boise, ID, 83725, USA.

Graphene foam (GF), a 3-dimensional derivative of graphene, has received much attention recently for applications in tissue engineering due to its unique mechanical, electrical, and thermal properties. Although GF is an appealing material for cartilage tissue engineering, the mechanical properties of GF - tissue composites under dynamic compressive loads have not yet been reported. The objective of this study was to measure the elastic and viscoelastic properties of GF and GF-tissue composites under unconfined compression when quasi-static and dynamic loads are applied at strain magnitudes below 20%. Read More

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September 2018

Flexible Thin-Film Electrodes on Porous Polyester Membranes for Wearable Sensors.

Adv Eng Mater 2017 ;19

Electrical and Computer Engineering Department, George Mason University Fairfax, VA 22030, USA.

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January 2017

Crystal Structure of the ZrO Phase at Zirconium/Zirconium Oxide Interfaces.

Adv Eng Mater 2015 Feb 27;17(2):211-215. Epub 2014 Jun 27.

Dr. R. J. Nicholls, Dr. S. Lozano-Perez, A. London, Prof. P. D. Nellist, Prof. C. R. M. Grovenor, Dr. J. R. Yates, Department of Materials, University of Oxford Parks Road, Oxford, OX1 3PH, UK.

Zirconium-based alloys are used in water-cooled nuclear reactors for both nuclear fuel cladding and structural components. Under this harsh environment, the main factor limiting the service life of zirconium cladding, and hence fuel burn-up efficiency, is water corrosion. This oxidation process has recently been linked to the presence of a sub-oxide phase with well-defined composition but unknown structure at the metal-oxide interface. Read More

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February 2015

The Stanford Nanocharacterization Laboratory (SNL) and Recent Applications of an Aberration-Corrected Environmental Transmission Electron Microscope.

Adv Eng Mater 2014 May;16(5):476-481

Stanford Nano Shared Facilities McCullough Rm. 236 476 Lomita Mall Stanford CA, 94305-4045, USA.

This article describes the establishment, over a period of ten years or so, of a multi-user, institution-wide facility for the characterization of materials and devices at the nano-scale. Emphasis is placed on the type of equipment that we have found to be most useful for our users, and the business strategy that maintains its operations. A central component of our facility is an aberration-corrected environmental transmission electron microscope and its application is summarized in the studies of plasmon energies of silver nanoparticles, the band gap of PbS quantum dots, atomic site occupancy near grain boundaries in yttria stabilized zirconia, the lithiation of silicon nanoparticles, in situ observations on carbon nanotube oxidation and the electron tomography of varicella zoster virus nucleocapsids. Read More

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Strength, Hardening, and Failure Observed by In Situ TEM Tensile Testing.

Adv Eng Mater 2012 Nov 7;14(11):960-967. Epub 2012 May 7.

Department of Materials Physics, Montanuniversität Leoben, Jahnstraße 12 8700 Leoben, Austria ; National Center for Electron Microscopy, Lawrence Berkeley National Laboratory 94720 Berkeley, CA, USA.

We present in situ transmission electron microscope tensile tests on focused ion beam fabricated single and multiple slip oriented Cu tensile samples with thicknesses in the range of 100-200 nm. Both crystal orientations fail by localized shear. While failure occurs after a few percent plastic strain and limited hardening in the single slip case, the multiple slip samples exhibit extended homogenous deformation and necking due to the activation of multiple dislocation sources in conjunction with significant hardening. Read More

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November 2012

Layer-by-Layer Fabrication of Covalently Crosslinked and Reactive Polymer Multilayers Using Azlactone-Functionalized Copolymers: A Platform for the Design of Functional Biointerfaces.

Adv Eng Mater 2011 Oct 21;13(10):B343-B352. Epub 2011 Jan 21.

Department of Chemistry, 1101 University Avenue, University of Wisconsin-Madison, Madison, WI 53706.

We report a method for modulating the physicochemical properties of surfaces that is based on the reactive layer-by-layer fabrication of covalently crosslinked thin films using azlactone-functionalized copolymers. We demonstrate that copolymers containing different molar ratios of methylmethacrylate (MMA) and 2-vinyl-4,4-dimethylazlactone (VDMA) can be alternately deposited with poly(ethyleneimine) to assemble covalently crosslinked thin films. Characterization using ellipsometry demonstrates that, in general, film growth and thickness decrease as the content of reactive, azlactone functionality in the copolymer used to assemble the film decreases. Read More

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October 2011

Two Photon Polymerization-Micromolding of Polyethylene Glycol-Gentamicin Sulfate Microneedles.

Adv Eng Mater 2010 Apr;12(4):B77-B82

Joint Department of Biomedical Engineering, University of North Carolina, and North Carolina State University, Chapel Hill, Raleigh, NC 27599-7115, USA.

The use of microneedles for transdermal drug delivery is limited due to the risk of infection associated with formation of channels through the stratum corneum layer of the epidermis. The risk of infection associated with use of microneedles may be reduced by imparting these devices with antimicrobial properties. In this study, a photopolymerization-micromolding technique was used to fabricate microneedle arrays from a photosensitive material containing polyethylene glycol 600 diacrylate, gentamicin sulfate, and a photoinitiator. Read More

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