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https://www.readbyqxmd.com/read/28187519/development-of-a-novel-alginate-polyvinyl-alcohol-hydroxyapatite-hydrogel-for-3d-bioprinting-bone-tissue-engineered-scaffolds
#1
Stephanie T Bendtsen, Sean P Quinnell, Mei Wei
3D printed biomaterials used as personalized tissue substitutes have the ability to promote and enhance regeneration in areas of defected tissue. The challenge with 3D printing for bone tissue engineering remains the selection of a material with optimal rheological properties for printing in addition to biocompatibility and capacity for uniform cell incorporation. Hydrogel biomaterials may provide sufficient printability to allow cell encapsulation and bioprinting of scaffolds with uniform cell distribution...
February 10, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28181617/3d-printable-highly-conductive-hybrid-composites-employing-chemically-reinforced-complex-dimensional-fillers-and-thermoplastic-triblock-copolymers
#2
Yejin Jo, Ju Young Kim, So-Yun Kim, Yeong-Hui Seo, Kwang-Suk Jang, Su Yeon Lee, Sungmook Jung, Beyong-Hwan Ryu, Hyun-Suk Kim, Jang-Ung Park, Youngmin Choi, Sunho Jeong
The use of 3-dimensional (3D) printable conductive materials has gained significant attention for various applications because of their ability to form unconventional geometrical architectures that cannot be realized with traditional 2-dimensional printing techniques. To resolve the major requisites in printed electrodes for practical applications (including high conductivity, 3D printability, excellent adhesion, and low-temperature processability), we have designed a chemically-reinforced multi-dimensional filler system comprising amine-functionalized carbon nanotubes, carboxyl-terminated silver nanoparticles, and Ag flakes, with the incorporation of a thermoplastic polystyrene-polyisoprene-polystyrene (SIS) triblock copolymer...
February 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28157332/arbitrary-shaped-graphene-based-planar-sandwich-supercapacitors-on-one-substrate-with-enhanced-flexibility-and-integration
#3
Shuanghao Zheng, Xingyan Tang, Zhong-Shuai Wu, Yuan-Zhi Tan, Sen Wang, Chenglin Sun, Hui-Ming Cheng, Xinhe Bao
The emerging smart power source-unitized electronics represent an utmost innovative paradigm requiring dramatic alteration from materials to device assembly and integration. However, traditional power sources with huge bottlenecks on the design and performance cannot keep pace with the revolutionized progress of shape-confirmable integrated circuits. Here, we demonstrate a versatile printable technology to fabricate arbitrary-shaped, printable graphene-based planar sandwich supercapacitors based on the layer-structured film of electrochemically exfoliated graphene as two electrodes and nanosized graphene oxide (lateral size of 100 nm) as a separator on one substrate...
February 9, 2017: ACS Nano
https://www.readbyqxmd.com/read/28150486/multifunctional-hybrid-multilayer-gate-dielectrics-with-tunable-surface-energy-for-ultralow-power-organic-and-amorphous-oxide-thin-film-transistors
#4
Hye-Ran Byun, Eun-Ah You, Young-Geun Ha
For large-area, printable, and flexible electronic applications using advanced semiconductors, novel dielectric materials with excellent capacitance, insulating property, thermal stability and mechanical flexibility need to be developed to achieve high-performance, ultralow-voltage operation of thin-film transistors (TFTs). In this paper, we first report on the facile fabrication of multifunctional hybrid multilayer gate dielectrics with tunable surface energy via a low-temperature solution-process to produce ultralow-voltage organic and amorphous oxide TFTs...
February 2, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28117778/morphology-control-for-fully-printable-organic-inorganic-bulk-heterojunction-solar-cells-based-on-a-ti-alkoxide-and-semiconducting-polymer
#5
Takehito Kato, Chihiro Oinuma, Munechika Otsuka, Naoki Hagiwara
The photoactive layer of a typical organic thin-film bulk-heterojunction (BHJ) solar cell commonly uses fullerene derivatives as the electron-accepting material. However, fullerene derivatives are air-sensitive; therefore, air-stable material is needed as an alternative. In the present study, we propose and describe the properties of Ti-alkoxide as an alternative electron-accepting material to fullerene derivatives to create highly air-stable BHJ solar cells. It is well-known that controlling the morphology in the photoactive layer, which is constructed with fullerene derivatives as the electron acceptor, is important for obtaining a high overall efficiency through the solvent method...
January 10, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28102670/microfluidization-of-graphite-and-formulation-of-graphene-based-conductive-inks
#6
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
#7
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
#8
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 h 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...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28025653/designing-biomaterials-for-3d-printing
#9
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
#10
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
#11
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...
20, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27982475/progress-in-3d-printing-of-carbon-materials-for-energy-related-applications
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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