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https://www.readbyqxmd.com/read/29319214/printable-transparent-conductive-films-for-flexible-electronics
#1
REVIEW
Dongdong Li, Wen-Yong Lai, Yi-Zhou Zhang, Wei Huang
Printed electronics are an important enabling technology for the development of low-cost, large-area, and flexible optoelectronic devices. Transparent conductive films (TCFs) made from solution-processable transparent conductive materials, such as metal nanoparticles/nanowires, carbon nanotubes, graphene, and conductive polymers, can simultaneously exhibit high mechanical flexibility, low cost, and better photoelectric properties compared to the commonly used sputtered indium-tin-oxide-based TCFs, and are thus receiving great attention...
January 10, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29315917/covalent-bonding-of-thermoplastics-to-rubbers-for-printable-reel-to-reel-processing-in-soft-robotics-and-microfluidics
#2
Jay M Taylor, Karla Perez-Toralla, Ruby Aispuro, Stephen A Morin
The lamination of mechanically stiff structures to elastic materials is prevalent in biological systems and popular in many emerging synthetic systems, such as soft robotics, microfluidics, stretchable electronics, and pop-up assemblies. The disparate mechanical and chemical properties of these materials have made it challenging to develop universal synthetic procedures capable of reliably adhering to these classes of materials together. Herein, a simple and scalable procedure is described that is capable of covalently laminating a variety of commodity ("off-the-shelf") thermoplastic sheets to silicone rubber films...
January 8, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29313550/functional-liquid-structures-by-emulsification-of-graphene-and-other-two-dimensional-nanomaterials
#3
Matthew J Large, Sean P Ogilvie, Manuela Meloni, Aline Amorim Graf, Giuseppe Fratta, Jonathan Salvage, Alice A K King, Alan B Dalton
Pickering emulsions stabilised with nanomaterials provide routes to a range of functional macroscopic assemblies. We demonstrate the formation and properties of water-in-oil emulsions prepared through liquid-phase exfoliation of graphene. Due to the functional nature of the stabiliser, the emulsions exhibit conductivity due to inter-particle tunnelling. We demonstrate a strain sensing application with a large gauge factor of ∼40; the highest reported in a liquid. Our methodology can be applied to other two-dimensional layered materials opening up applications such as energy storage materials, and flexible and printable electronics...
January 9, 2018: Nanoscale
https://www.readbyqxmd.com/read/29312871/patient-specific-three-dimensional-printing-for-pre-surgical-planning-in-hepatocellular-carcinoma-treatment
#4
Elizabeth Perica, Zhonghua Sun
Background: Recently, three-dimensional (3D) printing has shown great interest in medicine, and 3D printed models may be rendered as part of the pre-surgical planning process in order to better understand the complexities of an individual's anatomy. The aim of this study is to investigate the feasibility of utilising 3D printed liver models as clinical tools in pre-operative planning for resectable hepatocellular carcinoma (HCC) lesions. Methods: High-resolution contrast-enhanced computed tomography (CT) images were acquired and utilized to generate a patient-specific 3D printed liver model...
December 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29305984/3d-printed-tablets-with-internal-scaffold-structure-using-ethyl-cellulose-to-achieve-sustained-ibuprofen-release
#5
Yan Yang, Huihui Wang, Haichao Li, Zhimin Ou, Gensheng Yang
The object of this study is to prepare and evaluate tablets with predesigned internal scaffold structure using 3D printing to achieve sustained drug release. Model drug (ibuprofen) and sustained release material (ethyl cellulose), together with other excipients, were firstly mixed and extruded into filaments by hot melt extrusion. Then these obtained filaments were printed into tablets by fused deposition modeling. The tablets printability and drug release behavior were influenced by drug content, release modifiers, printing parameters and modeling...
January 3, 2018: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29297780/fully-3d-printed-multi-material-soft-bio-inspired-whisker-sensor-for-underwater-induced-vortex-detection
#6
Jahan Zeb Gul, Kim Young Su, Kyung Hyun Choi
Bio-mimicking the underwater sensors has tremendous potential in soft robotics, under water exploration and human interfaces. Pinniped are semiaquatic carnivores that use their whiskers to sense food by tracking the vortices left by potential prey. To detect and track the vortices inside the water, a fully 3D printed pinniped inspired multi-material whisker sensor is fabricated and characterized. The fabricated whisker is composed of a polyurethane rod with a length-to-diameter ratio (L/d) of 20:1 with four graphene patterns (length × diameter: 60 × 0...
January 3, 2018: Soft Robotics
https://www.readbyqxmd.com/read/29277743/residual-wood-polymers-facilitate-compounding-of-microfibrillated-cellulose-with-poly-lactic-acid-for-3d-printer-filaments
#7
Armin Winter, Norbert Mundigler, Julian Holzweber, Stefan Veigel, Ulrich Müller, Adriana Kovalcik, Wolfgang Gindl-Altmutter
Microfibrillated cellulose (MFC) is a fascinating material with an obvious potential for composite reinforcement due to its excellent mechanics together with high specific surface area. However, in order to use this potential, commercially viable solutions to important technological challenges have to be found. Notably, the distinct hydrophilicity of MFC prevents efficient drying without loss in specific surface area, necessitating storage and processing in wet condition. This greatly hinders compounding with important technical polymers immiscible with water...
February 13, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29259877/the-role-of-ligands-in-coinage-metal-nanoparticles-for-electronics
#8
REVIEW
Ioannis Kanelidis, Tobias Kraus
Coinage-metal nanoparticles are key components of many printable electronic inks. They can be combined with polymers to form conductive composites and have been used as the basis of molecular electronic devices. This review summarizes the multidimensional role of surface ligands that cover their metal cores. Ligands not only passivate crystal facets and determine growth rates and shapes; they also affect size and colloidal stability. Particle shapes can be tuned via the ligand choice while ligand length, size, ω-functionalities, and chemical nature influence shelf-life and stability of nanoparticles in dispersions...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29247228/nanoimprinted-high-refractive-index-active-photonic-nanostructures-based-on-quantum-dots-for-visible-light
#9
Carlos Pina-Hernandez, Alexander Koshelev, Scott Dhuey, Simone Sassolini, Michela Sainato, Stefano Cabrini, Keiko Munechika
A novel method to realizing printed active photonic devices was developed using nanoimprint lithography (NIL), combining a printable high-refractive index material and colloidal CdSe/CdS quantum dots (QDs) for applications in the visible region. Active media QDs were applied in two different ways: embedded inside a printable high-refractive index matrix to form an active printable hybrid nanocomposite, and used as a uniform coating on top of printed photonic devices. As a proof-of-demonstration for printed active photonic devices, two-dimensional (2-D) photonic crystals as well as 1D and 2D photonic nanocavities were successfully fabricated following a simple reverse-nanoimprint process...
December 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29236489/magnesium-catalyzed-polymerization-of-end-functionalized-poly-propylene-maleate-and-poly-propylene-fumarate-for-3d-printing-of-bioactive-scaffolds
#10
James A Wilson, Derek Luong, Alex P Kleinfehn, Sahar Sallam, Chrys Wesdemiotis, Matthew L Becker
The ring-opening copolymerization of maleic anhydride and propylene oxide, using a functionalized primary alcohol initiator and magnesium 2,6-di-tert-butyl phenoxide as a catalyst, was investigated in order to produce high end-group fidelity poly(propylene maleate). Subsequent isomerization of the material into 3D printable poly(propylene fumarate) was utilized to produce scaffolds and thin films possessing groups that can be modified post-polymerization and post-printing. The surface concentration of these modifiable groups was determined to be 30...
December 13, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29215171/graphene-inks-as-versatile-templates-for-printing-tiled-metal-oxide-crystalline-films
#11
Muchun Liu, Po-Yen Chen, Robert H Hurt
There is great interest in exploiting van der Waals gaps in layered materials as confinement reaction vessels to template the synthesis of new nanosheet structures. The gallery spaces in multilayer graphene oxide, for example, can intercalate hydrated metal ions that assemble into metal oxide films during thermal oxidation of the sacrificial graphene template. This approach offers limited control of structure, however, and does not typically lead to 2D atomic-scale growth of anisotropic platelet crystals, but rather arrays of simple particles directionally sintered into porous sheets...
December 7, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29210493/custom-3d-printable-silicones-with-tunable-stiffness
#12
Matthew M Durban, Jeremy M Lenhardt, Amanda S Wu, Ward Small, Taylor M Bryson, Lemuel Perez-Perez, Du T Nguyen, Stuart Gammon, James E Smay, Eric B Duoss, James P Lewicki, Thomas S Wilson
Silicone elastomers have broad versatility within a variety of potential advanced materials applications, such as soft robotics, biomedical devices, and metamaterials. A series of custom 3D printable silicone inks with tunable stiffness is developed, formulated, and characterized. The silicone inks exhibit excellent rheological behavior for 3D printing, as observed from the printing of porous structures with controlled architectures. Herein, the capability to tune the stiffness of printable silicone materials via careful control over the chemistry, network formation, and crosslink density of the ink formulations in order to overcome the challenging interplay between ink development, post-processing, material properties, and performance is demonstrated...
December 6, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29182241/ultrathin-plasmonic-optical-thermal-barrier-flash-light-sintered-copper-electrodes-compatible-with-polyethylene-terephthalate-plastic-substrates
#13
Hye Jin Park, Min Kyung Cho, Young Woo Jeong, Dojin Kim, Su Yeon Lee, Youngmin Choi, Sunho Jeong
In recent years, highly conductive, printable electrodes have received tremendous attention in various research fields as the most important constituent components for large-area, low-cost electronics. In terms of an indispensable sintering process for generating electrodes from printable metallic nanomaterials, a flash-light-based sintering technique has been regarded as a viable approach for continuous roll-to-roll processes. In this paper, to satisfy these requisites in both material and process, we report cost-effective, printable Cu electrodes that can be applied to vulnerable polyethylene terephthalate (PET) substrates, by incorporating a heretofore-unrecognized ultrathin plasmonic thermal/optical barrier, which is composed of a 30 nm-thick Ag nanoparticle layer...
November 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29173866/computer-aided-design-and-manufacture-of-hyrax-devices-can-we-really-go-digital
#14
Simon Graf, Marie A Cornelis, Gustavo Hauber Gameiro, Paolo M Cattaneo
The aim of this pilot study was to illustrate the feasibility of a new digital procedure to fabricate metallic orthodontic appliances. Hyrax appliances for rapid palatal expansion were produced for 3 patients using a CAD/CAM procedure without physical impressions or printed models. The work flow consisted of intraoral scanning, digital design with incorporation of a scanned prefabricated expansion screw, direct 3-dimensional metal printing via laser melting, welding of an expansion screw, insertion, and finally activation in the patients' mouths...
December 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29170727/grasping-state-estimation-of-printable-soft-gripper-using-electro-conductive-yarn
#15
Takahiro Matsuno, Zhongkui Wang, Shinichi Hirai
Automatic handling of many types of food materials are required to realize the automation of production of commercially prepared box lunches. A printable soft gripper was developed for food handling which is simple to produce with a 3D printer. However, the sensing ability of the printable soft gripper was not discussed in previous research. In this paper, a novel method for estimating the grasping state of a printable soft gripper using electro-conductive yarn is presented. Electro-conductive yarn is a conductive material, and the resistance of strings is changed by stretching...
2017: Robotics and Biomimetics
https://www.readbyqxmd.com/read/29170527/theoretical-investigations-on-microwave-fano-resonances-in-3d-printable-hollow-dielectric-resonators
#16
Eunsongyi Lee, In Cheol Seo, Hoon Yeub Jeong, Soo-Chan An, Young Chul Jun
High-index dielectric structures have recently been studied intensively for Mie resonances at optical frequencies. These dielectric structures can enable extreme light manipulation, similar to that which has been achieved with plasmonic nanostructures. In the microwave region, dielectric resonators and metamaterials can be fabricated directly using 3D printing, which is advantageous for fabricating structurally complicated 3D geometries. It is therefore especially suitable for the fabrication of subwavelength structures...
November 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29149531/solution-adsorption-formation-of-a-%C3%AF-conjugated-polymer-graphene-composite-for-high-performance-field-effect-transistors
#17
Yun Liu, Wei Hao, Huiying Yao, Shuzhou Li, Yuchen Wu, Jia Zhu, Lei Jiang
Semiconducting polymers with π-conjugated electronic structures have potential application in the large-scale printable fabrication of high-performance electronic and optoelectronic devices. However, owing to their poor environmental stability and high-cost synthesis, polymer semiconductors possess limited device implementation. Here, an approach for constructing a π-conjugated polymer/graphene composite material to circumvent these limitations is provided, and then this material is patterned into 1D arrays...
November 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29144426/experimental-exploration-of-metal-cable-as-reinforcement-in-3d-printed-concrete
#18
Freek P Bos, Zeeshan Y Ahmed, Evgeniy R Jutinov, Theo A M Salet
The Material Deposition Method (MDM) is enjoying increasing attention as an additive method to create concrete mortar structures characterised by a high degree of form-freedom, a lack of geometrical repetition, and automated construction. Several small-scale structures have been realised around the world, or are under preparation. However, the nature of this construction method is unsuitable for conventional reinforcement methods to achieve ductile failure behaviour. Sometimes, this is solved by combining printing with conventional casting and reinforcing techniques...
November 16, 2017: Materials
https://www.readbyqxmd.com/read/29128598/histological-and-radiological-evaluation-of-subcutaneous-implants-in-mouse-of-a-3d-printable-material-fulcure-720-and-experimental-application-in-mandibular-reconstruction
#19
J Megías Barrera, L García-Consuegra, A Novoa, S Costilla, S Junquera, G Ascani
INTRODUCTION: The aim of this study was to evaluate the bioactivity of FullCure compared to porous polyethylene implants (Medpor) in rats prior to custom-made scaffold support manufacturing for mandible segmental defects (MSD) reconstruction in sheep. METHODS: 12 Fullcure and Medpor laminaes were implanted in the left and right dorsum respectively of 6 wistar rats. Toxicity was assessed by skin, kidney and liver histopathology 3 months post-implantation. Computed Tomography (CT) was carried out in order to assess radiological differences between implants...
November 8, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29110921/3d-printed-versus-conventionally-cured-provisional-crown-and-bridge-dental-materials
#20
Anthony Tahayeri, MaryCatherine Morgan, Ana P Fugolin, Despoina Bompolaki, Avathamsa Athirasala, Carmem S Pfeifer, Jack L Ferracane, Luiz E Bertassoni
OBJECTIVES: To optimize the 3D printing of a dental material for provisional crown and bridge restorations using a low-cost stereolithography 3D printer; and compare its mechanical properties against conventionally cured provisional dental materials. METHODS: Samples were 3D printed (25×2×2mm) using a commercial printable resin (NextDent C&B Vertex Dental) in a FormLabs1+ stereolithography 3D printer. The printing accuracy of printed bars was determined by comparing the width, length and thickness of samples for different printer settings (printing orientation and resin color) versus the set dimensions of CAD designs...
October 27, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
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