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https://www.readbyqxmd.com/read/28102670/microfluidization-of-graphite-and-formulation-of-graphene-based-conductive-inks
#1
Panagiotis G Karagiannidis, Stephen A Hodge, Lucia Lombardi, Flavia Tomarchio, Nicolas Decorde, Silvia Milana, Ilya Goykhman, Yang Su, Steven V Mesite, Duncan N Johnstone, Rowan K Leary, Paul A Midgley, Nicola M Pugno, Felice Torrisi, Andrea C Ferrari
We report the exfoliation of graphite in aqueous solutions under high shear rate turbulent flow conditions, with a 100\% exfoliation yield. The material is stabilized without centrifugation at concentrations up to 100 g/L using carboxymethylcellulose sodium salt to formulate conductive printable inks. The sheet resistance of blade coated films is below~2Ω/□. This is a simple and scalable production route for conductive inks for large area printing in flexible electronics.
January 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28040366/3d-printed-transparent-facemasks-in-the-treatment-of-facial-hypertrophic-scars-of-young-children-with-burns
#2
Yating Wei, Cecilia W P Li-Tsang, Jun Liu, Lihua Xie, Shukai Yue
INTRODUCTION: Facial burns could create serious scar problems resulting disfigurement particularly on children. The conventional methods of producing transparent face masks for scar control remains complex and require dexterous skills of experienced clinician and patients' compliance during fitting. In this study, we adopted a portable 3D scanning and Computer-Aided Design (CAD) to produce 3D-printed transparent facemasks. Its efficacy was tested on two children with facial burns resulting hypertrophic scars...
December 28, 2016: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/28032746/soluble-metal-oxo-alkoxide-inks-with-advanced-rheological-properties-for-inkjet-printed-thin-film-transistors
#3
Sebastian Meyer, Duy Vu Pham, Sonja Merkulov, Dennis Weber, Alexey Merkulov, Niels Benson, Roland Schmechel
Semiconductor inks containing an indium-based oxo alkoxide precursor material were optimized regarding rheology requirements for a commercial 10 pL inkjet printhead. The rheological stability is evaluated by measuring the dynamic viscosity of the formulations for 12 hours with a constant shear rate stress under ambient conditions. It is believed that the observed superior stability of the inks is the result of effectively suppressing the hydrolysis and condensation reaction between the metal oxo alkoxide precursor complex and atmospheric water...
December 29, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28025653/designing-biomaterials-for-3d-printing
#4
Murat Guvendiren, Joseph Molde, Rosane M D Soares, Joachim Kohn
Three-dimensional (3D) printing is becoming an increasingly common technique to fabricate scaffolds and devices for tissue engineering applications. This is due to the potential of 3D printing to provide patient-specific designs, high structural complexity, rapid on-demand fabrication at a low-cost. One of the major bottlenecks that limits the widespread acceptance of 3D printing in biomanufacturing is the lack of diversity in "biomaterial inks". Printability of a biomaterial is determined by the printing technique...
October 10, 2016: ACS Biomaterials Science & Engineering
https://www.readbyqxmd.com/read/27998214/fabrication-of-a-highly-aligned-neural-scaffold-via-a-table-top-stereolithography-3d-printing-and-electrospinning
#5
Se-Jun Lee, Margaret Nowicki, Brent Harris, Lijie Grace Zhang
Three-dimensional (3D) bioprinting is a rapidly emerging technique in the field of tissue engineering to fabricate extremely intricate and complex biomimetic scaffolds in the range of micrometers. Such customized 3D printed constructs can be used for the regeneration of complex tissues such as cartilage, vessels, and nerves. However, the 3D printing techniques often offer limited control over the resolution and compromised mechanical properties due to short selection of printable inks. To address these limitations, we combined stereolithography and electrospinning techniques to fabricate a novel 3D biomimetic neural scaffold with a tunable porous structure and embedded aligned fibers...
January 11, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/27993010/flow-directed-crystallization-for-printed-electronics
#6
Ge Qu, Justin J Kwok, Ying Diao
The solution printability of organic semiconductors (OSCs) represents a distinct advantage for materials processing, enabling low-cost, high-throughput, and energy-efficient manufacturing with new form factors that are flexible, stretchable, and transparent. While the electronic performance of OSCs is not comparable to that of crystalline silicon, the solution processability of OSCs allows them to complement silicon by tackling challenging aspects for conventional photolithography, such as large-area electronics manufacturing...
December 20, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27982475/progress-in-3d-printing-of-carbon-materials-for-energy-related-applications
#7
Kun Fu, Yonggang Yao, Jiaqi Dai, Liangbing Hu
The additive-manufacturing (AM) technique, known as three-dimensional (3D) printing, has attracted much attention in industry and academia in recent years. 3D printing has been developed for a variety of applications. Printable inks are the most important component for 3D printing, and are related to the materials, the printing method, and the structures of the final 3D-printed products. Carbon materials, due to their good chemical stability and versatile nanostructure, have been widely used in 3D printing for different applications...
December 16, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27974748/printing-soft-matter-in-three-dimensions
#8
Ryan L Truby, Jennifer A Lewis
Light- and ink-based three-dimensional (3D) printing methods allow the rapid design and fabrication of materials without the need for expensive tooling, dies or lithographic masks. They have led to an era of manufacturing in which computers can control the fabrication of soft matter that has tunable mechanical, electrical and other functional properties. The expanding range of printable materials, coupled with the ability to programmably control their composition and architecture across various length scales, is driving innovation in myriad applications...
December 14, 2016: Nature
https://www.readbyqxmd.com/read/27960390/high-performance-3d-printable-dielectric-nanocomposites-for-millimeter-wave-devices
#9
Michael Lis, Maxwell Plaut, Andrew Zai, David Cipolle, John Russo, Theodore Fedynyshyn
The creation of millimeter wave, 3D-printable dielectric nanocomposite is demonstrated. Alumina nanoparticles were combined with styrenic block copolymers and solvent to create shear thinning, viscoelastic inks that are printable at room temperature. Particle loadings of up to 41 vol % were achieved. Upon being dried, the highest-performing of these materials has a permittivity of 4.61 and a loss tangent of 0.00298 in the Ka band (26.5-40 GHz), a combination not previously demonstrated for 3D printing. These nanocomposite materials were used to print a simple resonator device with predictable pass-band features...
December 14, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27942578/three-dimensional-printing-of-bone-extracellular-matrix-for-craniofacial-regeneration
#10
Ben P Hung, Bilal A Naved, Ethan L Nyberg, Miguel Dias, Christina A Holmes, Jennifer H Elisseeff, Amir H Dorafshar, Warren L Grayson
Tissue-engineered approaches to regenerate bone in the craniomaxillofacial region utilize biomaterial scaffolds to provide structural and biological cues to stem cells to stimulate osteogenic differentiation. Bioactive scaffolds are typically comprised of natural components but often lack the manufacturability of synthetic materials. To circumvent this trade-off, we 3D printed materials comprised of decellularized bone (DCB) matrix particles combined with polycaprolactone (PCL) to create novel hybrid DCB:PCL scaffolds for bone regeneration...
October 10, 2016: ACS Biomaterials Science & Engineering
https://www.readbyqxmd.com/read/27918636/4d-printing-of-shape-memory-based-personalized-endoluminal-medical-devices
#11
Matt Zarek, Nicola Mansour, Shir Shapira, Daniel Cohn
The convergence of additive manufacturing and shape-morphing materials is promising for the advancement of personalized medical devices. The capability to transform 3D objects from one shape to another, right off the print bed, is known as 4D printing. Shape memory thermosets can be tailored to have a range of thermomechanical properties favorable to medical devices, but processing them is a challenge because they are insoluble and do not flow at any temperature. This study presents here a strategy to capitalize on a series of medical imaging modalities to construct a printable shape memory endoluminal device, exemplified by a tracheal stent...
December 5, 2016: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/27906403/printable-ink-lenses-diffusers-and-2d-gratings
#12
Rajib Ahmed, Ali K Yetisen, Anthony El Khoury, Haider Butt
Advances in holography have led to applications including data storage, displays, security labels, and colorimetric sensors. However, existing top-down approaches for the fabrication of holographic devices are complex, expensive, and expertise dependent, limiting their use in practical applications. Here, ink-based holographic devices have been created for a wide range of applications in diffraction optics. A single pulse of a 3.5 ns Nd:YAG laser allowed selective ablation of ink to nanofabricate planar optical devices...
January 7, 2017: Nanoscale
https://www.readbyqxmd.com/read/27822516/cual-id-globally-unique-correctable-and-human-friendly-sample-identifiers-for-comparative-omics-studies
#13
John H Chase, Evan Bolyen, Jai Ram Rideout, J Gregory Caporaso
The number of samples in high-throughput comparative "omics" studies is increasing rapidly due to declining experimental costs. To keep sample data and metadata manageable and to ensure the integrity of scientific results as the scale of these projects continues to increase, it is essential that we transition to better-designed sample identifiers. Ideally, sample identifiers should be globally unique across projects, project teams, and institutions; short (to facilitate manual transcription); correctable with respect to common types of transcription errors; opaque, meaning that they do not contain information about the samples; and compatible with existing standards...
January 2016: MSystems
https://www.readbyqxmd.com/read/27802016/temperature-dependent-performance-of-printed-field-effect-transistors-with-solid-polymer-electrolyte-gating
#14
Falk von Seggern, Inna Keskin, Erin Koos, Robert Kruk, Horst Hahn, Subho Dasgupta
Printable, physical, and air-stable composite solid polymer electrolytes (CSPEs) with high ionic conductivity have been established as a suitable alternative to standard dielectric gate insulators for printed field-effect transistors (FETs) and logics. We have performed a stress and temperature stability study involving several CSPEs. Mechanical tensile and shear tests have been performed to determine the physical condition of CSPEs. A comprehensive temperature dependent study has been conducted within the working temperature range which electric double layer (EDL) capacitors or CSPE-gated FETs may typically experience during their lifetime...
November 23, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27779379/3d-printing-of-ultratough-polyion-complex-hydrogels
#15
Fengbo Zhu, Libo Cheng, Jun Yin, Zi Liang Wu, Jin Qian, Jianzhong Fu, Qiang Zheng
Polyion complex (PIC) hydrogels have been proposed as promising engineered soft materials due to their high toughness and good processability. In this work, we reported manufacturing of complex structures with tough PIC hydrogels based on three-dimensional (3D) printing technology. The strategy relies on the distinct strength of ionic bonding in PIC hydrogels at different stages of printing. In concentrated saline solution, PIC forms viscous solution, which can be directly extruded out of a nozzle into water, where dialyzing out of salt and counterions results in sol-gel transition to form tough physical PIC gel with intricate structures...
November 16, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27749641/developing-and-testing-an-electronic-literacy-resource-for-arab-patients-before-experiencing-radiology-procedures
#16
Mohamed M Abuzaid, Aishah M Alnuaimi, Asma M Abdi, Elika A Mohajer, Ifrah A Mohamed, Rawan A Bilwani, Shaima B Alhammadi
BACKGROUND: Radiological examinations require prior preparation that patients should be informed about. Radiologists and radiologic technologists have limited time and resources to do so. Therefore, the internet is a valuable and accessible resource for patient education, but the information may not be reliable, especially that in Arabic language. This study aimed to develop online patient education resources about imaging procedures in Arabic. It also evaluated the understandability and actionability of the source materials...
September 2016: Journal of the Egyptian Public Health Association
https://www.readbyqxmd.com/read/27708034/high-quality-graphene-via-microwave-reduction-of-solution-exfoliated-graphene-oxide
#17
Damien Voiry, Jieun Yang, Jacob Kupferberg, Raymond Fullon, Calvin Lee, Hu Young Jeong, Hyeon Suk Shin, Manish Chhowalla
Efficient exfoliation of graphite in solutions to obtain high-quality graphene flakes is desirable for printable electronics, catalysis, energy storage, and composites. Graphite oxide with large lateral dimensions has an exfoliation yield of ~100%, but it has not been possible to completely remove the oxygen functional groups so that the reduced form of graphene oxide (GO; reduced form: rGO) remains a highly disordered material. Here we report a simple, rapid method to reduce GO into pristine graphene using 1- to 2-second pulses of microwaves...
September 23, 2016: Science
https://www.readbyqxmd.com/read/27704769/mechanically-tunable-readily-processable-ion-gels-by-self-assembly-of-block-copolymers-in-ionic-liquids
#18
Timothy P Lodge, Takeshi Ueki
Room temperature ionic liquids are of great interest for many advanced applications, due to the combination of attractive physical properties with essentially unlimited tunability of chemical structure. High chemical and thermal stability, favorable ionic conductivity, and complete nonvolatility are just some of the most important physical characteristics that make ionic liquids promising candidates for emerging technologies. Examples include separation membranes, actuators, polymer gel electrolytes, supercapacitors, ion batteries, fuel cell membranes, sensors, printable plastic electronics, and flexible displays...
October 5, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27658612/bioink-properties-before-during-and-after-3d-bioprinting
#19
Katja Hölzl, Shengmao Lin, Liesbeth Tytgat, Sandra Van Vlierberghe, Linxia Gu, Aleksandr Ovsianikov
Bioprinting is a process based on additive manufacturing from materials containing living cells. These materials, often referred to as bioink, are based on cytocompatible hydrogel precursor formulations, which gel in a manner compatible with different bioprinting approaches. The bioink properties before, during and after gelation are essential for its printability, comprising such features as achievable structural resolution, shape fidelity and cell survival. However, it is the final properties of the matured bioprinted tissue construct that are crucial for the end application...
2016: Biofabrication
https://www.readbyqxmd.com/read/27649121/special-issue-biomaterials-and-bioprinting
#20
EDITORIAL
Chee Kai Chua, Wai Yee Yeong, Jia An
The emergence of bioprinting in recent years represents a marvellous advancement in 3D printing technology. It expands the range of 3D printable materials from the world of non-living materials into the world of living materials. Biomaterials play an important role in this paradigm shift. This Special Issue focuses on biomaterials and bioprinting and contains eight articles covering a number of recent topics in this emerging area.
September 14, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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