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https://www.readbyqxmd.com/read/28534907/inkjet-printed-highly-transparent-and-flexible-graphene-micro-supercapacitors
#1
Szymon Sollami Delekta, Anderson D Smith, Jiantong Li, Mikael Östling
Modern energy storage devices for portable and wearable technologies must fulfill a number of requirements, such as small size, flexibility, thinness, reliability, transparency, manufacturing simplicity and performance, in order to be competitive in an ever expanding market. To this end, a comprehensive inkjet printing process is developed for the scalable and low-cost fabrication of transparent and flexible micro-supercapacitors. These solid-state devices, with printed thin films of graphene flakes as interdigitated electrodes, exhibit excellent performance versus transparency (ranging from a single-electrode areal capacitance of 16 μF cm(-2) at transmittance of 90% to a capacitance of 99 μF cm(-2) at transmittance of 71%)...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28518077/inkjet-printed-polyvinyl-alcohol-multilayers
#2
Iulia Salaoru, Zuoxin Zhou, Peter Morris, Gregory J Gibbons
Inkjet printing is a modern method for polymer processing, and in this work, we demonstrate that this technology is capable of producing polyvinyl alcohol (PVOH) multilayer structures. A polyvinyl alcohol aqueous solution was formulated. The intrinsic properties of the ink, such as surface tension, viscosity, pH, and time stability, were investigated. The PVOH-based ink was a neutral solution (pH 6.7) with a surface tension of 39.3 mN/m and a viscosity of 7.5 cP. The ink displayed pseudoplastic (non-Newtonian shear thinning) behavior at low shear rates, and overall, it demonstrated good time stability...
May 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28505423/simple-inkjet-process-to-fabricate-microstructures-of-chitinous-nanocrystals-for-cell-patterning
#3
Shuntaro Suzuki, Yoshikuni Teramoto
Structural polysaccharide nanocrystals (NCs) including cellulose nanocrystal have attracted attention. In order to broaden the range of application of the NCs, we can take advantage of their original characteristics by establishing simple and reasonable processing methods. We here demonstrate a micropatterning of animal cellular adhesion by inkjet printing of aqueous dispersions of cytocompatible chitinous NCs onto cellophane films. We display how to regulate the deposition form and two-dimensional shape of the chitinous NC micromoldings using a research inkjet printer...
May 22, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28503662/picoliter-volume-inkjet-printing-into-planar-microdevice-reservoirs-for-low-waste-high-capacity-drug-loading
#4
Cade B Fox, Cameron L Nemeth, Rachel W Chevalier, Joshua Cantlon, Derek B Bogdanoff, Jeff C Hsiao, Tejal A Desai
Oral delivery of therapeutics is the preferred route for systemic drug administration due to ease of access and improved patient compliance. However, many therapeutics suffer from low oral bioavailability due to low pH and enzymatic conditions, poor cellular permeability, and low residence time. Microfabrication techniques have been used to create planar, asymmetric microdevices for oral drug delivery to address these limitations. The geometry of these microdevices facilitates prolonged drug exposure with unidirectional release of drug toward gastrointestinal epithelium...
March 2017: Bioengineering & Translational Medicine
https://www.readbyqxmd.com/read/28496134/inkjet-printing-of-nio-films-and-integration-as-hole-transporting-layers-in-polymer-solar-cells
#5
Arjun Singh, Shailendra Kumar Gupta, Ashish Garg
Stability concerns of organic solar cell devices have led to the development of alternative hole transporting layers such as NiO which lead to superior device life times over conventional Poly(3,4-ethylenedioxythiophene) Polystyrene sulfonate (PEDOT:PSS) buffered solar cells. From the printability of such devices, it is imperative to be able to print NiO layers in the organic solar cell devices with normal architecture which has so far remained unreported. In this manuscript, we report on the successful ink-jet printing of very thin NiO thin films with controlled thickness and morphology and their integration in organic solar cell devices...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28481267/inkjet-printed-membrane-for-a-capacitive-acoustic-sensor-development-and-characterization-using-laser-vibrometer
#6
Rubaiyet Iftekharul Haque, Erick Ogam, Patrick Benaben, Xavier Boddaert
This paper describes the fabrication process and the method to determine the membrane tension and defects of an inkjet-printed circular diaphragm. The membrane tension is an important parameter to design and fabricate an acoustic sensor and resonator with the highest sensitivity and selectivity over a determined range of frequency. During this work, the diaphragms are fabricated by inkjet printing of conductive silver ink on pre-strained Mylar thin films, and the membrane tension is determined using the resonant frequency obtained from its measured surface velocity response to an acoustic excitation...
May 6, 2017: Sensors
https://www.readbyqxmd.com/read/28471650/food-quality-monitor-paper-based-plasmonic-sensors-prepared-through-reversal-nanoimprinting-for-rapid-detection-of-biogenic-amine-odorants
#7
Shih-Yu Tseng, Szu-Ying Li, Shang-Yi Yi, Aileen Y Sun, Dong-Yu Gao, Dehui Wan
This paper describes the fabrication of paper-based plasmonic refractometric sensors through the embedding of metal nanoparticles (NPs) onto flexible papers using reversal nanoimprint lithography. The NP-embedded papers can serve as gas sensors for the detection of volatile biogenic amines (BAs) released from spoiled food. Commercial inkjet papers were employed as sensor substrates-their high reflectance (>80%) and smooth surfaces (roughness: ca. 4.9 nm) providing significant optical signals for reflection-mode plasmonic refractometric sensing and high particle transfer efficiency, respectively; in addition, because inkjet papers have lightweight and are burnable and flexible, they are especially suitable for developing portable, disposable, cost-effective, eco-friendly sensing platforms...
May 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28466636/versatile-molecular-silver-ink-platform-for-printed-flexible-electronics
#8
Arnold J Kell, Chantal Paquet, Olga Mozenson, Iden Djavani-Tabrizi, Bhavana Deore, Xiangyang Liu, Gregory P Lopinski, Robert James, Khelifa Hettak, Jafar Shaker, Adrian Momciu, Julie Ferrigno, Olivier Ferrand, Jian Xiong Hu, Sylvie Lafrenière, Patrick R L Malenfant
A silver molecular ink platform formulated for screen, inkjet, and aerosol jet printing is presented. A simple formulation comprising silver neodecanoate, ethyl cellulose, and solvent provides improved performance versus that of established inks, yet with improved economics. Thin, screen-printed traces with exceptional electrical (<10 mΩ/□/mil or 12 μΩ·cm) and mechanical properties are achieved following thermal or photonic sintering, the latter having never been demonstrated for silver-salt-based inks...
May 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28466635/thermoelectric-properties-of-highly-conductive-poly-3-4-ethylenedioxythiophene-polystyrene-sulfonate-printed-thin-films
#9
Davide Beretta, Alex J Barker, Isis Maqueira-Albo, Alberto Calloni, Gianlorenzo Bussetti, Giorgio Dell'Erba, Alessandro Luzio, Lamberto Duò, Annamaria Petrozza, Guglielmo Lanzani, Mario Caironi
Organic conductors are being evaluated for potential use in waste heat recovery through lightweight and flexible thermoelectric generators manufactured by means of cost effective printing processes. Assessment of the potentiality of organic materials in real devices still requires a deeper understanding of the physics behind their thermoelectric properties, which can pave the way towards further development of the field. This contribution reports a detailed thermoelectric study of a set of highly conducting inkjet printed films of commercially available poly(3,4-ethylenedioxythiophene) polystyrene sulfonate formulations characterized by in-plane electrical conductivity spanning the interval 10-500 S/cm ...
May 3, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28457137/study-of-pinch-off-locations-during-drop-on-demand-inkjet-printing-of-viscoelastic-alginate-solutions
#10
Changxue Xu, Zhengyi Zhang, Jianzhong Fu, Yong Huang
The ligament pinch-off process of viscoelastic fluids during jetting is a key step in various biotechnology and dropwise three-dimensional printing applications. Various pinch-off locations have been investigated as a function of material properties and operating conditions during the drop-on-demand (DOD) inkjet printing of viscoelastic alginate solutions. Four breakup types are identified on the basis of the location of the first pinch-off position: front pinching is mainly governed by a balance of inertial and capillary effects, exit pinching is affected by the external actuation-induced hydrodynamic instability and mainly governed by a balance of elastic and capillary effects, middle pinching usually occurs any place along a uniform thin ligament under dominant viscous and elastic effects, and hybrid pinching happens when front pinching and exit pinching occur simultaneously as a special case...
May 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28448003/standardized-method-for-measuring-collection-efficiency-from-wipe-sampling-of-trace-explosives
#11
Jennifer R Verkouteren, Jeffrey A Lawrence, Matthew E Staymates, Edward Sisco
One of the limiting steps to detecting traces of explosives at screening venues is effective collection of the sample. Wipe-sampling is the most common procedure for collecting traces of explosives, and standardized measurements of collection efficiency are needed to evaluate and optimize sampling protocols. The approach described here is designed to provide this measurement infrastructure, and controls most of the factors known to be relevant to wipe-sampling. Three critical factors (the applied force, travel distance, and travel speed) are controlled using an automated device...
April 10, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447801/droplets-on-microdecorated-surfaces-evolution-of-the-polygonal-contact-line
#12
Alok Kumar, Rishi Raj
Interaction of liquids with surfaces is ubiquitous in our physical environment as well as many engineering applications. Recent advances on this topic have not only provided us with valuable insight into nature's design, but also enabled improved fluidic manipulation for liquid-based printing applications such as biomicroarrays for protein and DNA sequencing, multicolor polymer-based LED displays, inkjet printing, and solder droplet printing, among others. For example, droplet contact lines, which are typically circular on a smooth and homogeneous surface, when deposited on a microdecorated surface may take various common polygonal shapes such as squares, rectangles, hexagons, octagons and dodecagons...
May 4, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28446781/inkjet-printing-of-high-performance-transistors-with-micron-order-chemically-set-gaps
#13
Peter Mack Grubb, Harish Subbaraman, Saungeun Park, Deji Akinwande, Ray T Chen
This paper reports a 100% inkjet printed transistor with a short channel of approximately 1 µm with an operating speed up to 18.21 GHz. Printed electronics are a burgeoning area in electronics development, but are often stymied by the large minimum feature size. To combat this, techniques were developed to allow for the printings of much shorter transistor channels. The small gap size is achieved through the use of silver inks with different chemical properties to prevent mixing. The combination of the short channel and semiconducting carbon nanotubes (CNT) allows for an exceptional experimentally measured on/off ratio of 10(6)...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28445488/a-versatile-method-for-dynamically-controlled-patterning-of-small-populations-of-epithelial-cells-on-substrates-via-non-contact-piezoelectric-inkjet-printing
#14
Kristen B Lee, Laimonas Kelbauskas, Alan Brunner, Deirdre R Meldrum
Intercellular interactions play a central role at the tissue and whole organism level modulating key cellular functions in normal and disease states. Studies of cell-cell communications are challenging due to ensemble averaging effects brought about by intrinsic heterogeneity in cellular function which requires such studies to be conducted with small populations of cells. Most of the current methods for producing and studying such small cell populations are complex to implement and require skilled personnel limiting their widespread utility in biomedical research labs...
2017: PloS One
https://www.readbyqxmd.com/read/28439069/drying-mediated-patterns-in-colloid-polymer-suspensions
#15
Seul-A Ryu, Jin Young Kim, So Youn Kim, Byung Mook Weon
Drying-mediated patterning of colloidal particles is a physical phenomenon that must be understood in inkjet printing technology to obtain crack-free uniform colloidal films. Here we experimentally study the drying-mediated patterns of a model colloid-polymer suspension and specifically observe how the deposit pattern appears after droplet evaporation by varying particle size and polymer concentration. We find that at a high polymer concentration, the ring-like pattern appears in suspensions with large colloids, contrary to suppression of ring formation in suspensions with small colloids thanks to colloid-polymer interactions...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28436215/multilayer-nanofilms-via-inkjet-printing-for-stabilizing-growth-factor-and-designing-desired-cell-developments
#16
Moonhyun Choi, Hee Ho Park, Daheui Choi, Uiyoung Han, Tai Hyun Park, Hwankyu Lee, Juhyun Park, Jinkee Hong
Biologically versatile basic fibroblast growth factor (bFGF), well known for roles of signaling molecules between cells and regulating various cellular processes, has been proven to utilize specific functionalities. However, the remarkable functions are inclinable to dwindle with decrease of bFGFs' activity. In nanoscale, developing thin films with intrinsic characteristics of building molecules can facilitate handling various materials for desired purposes. Fabricating nanofilm and handling sensitive materials without detriment to activity via highly productive manufacturing are significant for practical uses in the field of biomedical applications...
April 24, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28432016/inkjet-printing-of-antiviral-pcl-nanoparticles-and-anticancer-cyclodextrin-inclusion-complexes-on-bioadhesive-film-for-cervical-administration
#17
Cem Varan, Henrika Wickström, Niklas Sandler, Yeşim Aktaş, Erem Bilensoy
Personalized medicine is an important treatment approach for diseases like cancer with high intrasubject variability. In this framework, printing is one of the most promising methods since it permits dose and geometry adjustment of the final product. With this study, a combination product consisting of anticancer (paclitaxel) and antiviral (cidofovir) drugs was manufactured by inkjet printing onto adhesive film for local treatment of cervical cancers as a result of HPV infection. Furthermore, solubility problem of paclitaxel was overcome by maintaining this poorly soluble drug in a cyclodextrin inclusion complex and release of cidofovir was controlled by encapsulation in polycaprolactone nanoparticles...
April 18, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28420248/creating-an-optimal-3d-printed-model-for-temporal-bone-dissection-training
#18
Kuniyuki Takahashi, Yuka Morita, Shinsuke Ohshima, Shuji Izumi, Yamato Kubota, Yutaka Yamamoto, Sugata Takahashi, Arata Horii
OBJECTIVE: Making a 3-dimensional (3D) temporal bone model is simple using a plaster powder bed and an inkjet printer. However, it is difficult to reproduce air-containing spaces and precise middle ear structures. The objective of this study was to overcome these problems and create a temporal bone model that would be useful both as a training tool and for preoperative simulation. METHODS: Drainage holes were made to remove excess materials from air-containing spaces, ossicle ligaments were manually changed to bony structures, and small and/or soft tissue structures were colored differently while designing the 3D models...
April 1, 2017: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/28417631/inkjet-printed-quantum-dot-light-emitting-diodes-with-an-air-stable-hole-transport-material
#19
Zhenhua Xing, Jinyong Zhuang, Changting Wei, Dongyu Zhang, Zhongzhi Xie, Xiaoping Xu, Shunjun Ji, Jianxin Tang, Wenming Su, Zheng Cui
High-efficiency quantum dot light-emitting diodes (QLEDs) were fabricated using inkjet printing with a novel cross-linkable hole transport material N,N'-(9,9'-spirobi[fluorene]-2,7-diylbis[4,1-phenylene])bis(N-phenyl-4'-vinyl-[1,1'-biphenyl]-4-amine) (SDTF). The cross-linked SDTF film has excellent solvent resistance, high thermal stability, and the highest occupied molecular orbital (HOMO) level of -5.54 eV. The inkjet-printed SDTF film is very smooth and uniform, with roughness as low as 0.37 nm, which is comparable with that of the spin-coated film (0...
May 2, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28406922/3d-fabrication-and-characterization-of-phosphoric-acid-scaffold-with-a-ha-%C3%AE-tcp-weight-ratio-of-60-40-for-bone-tissue-engineering-applications
#20
Yanen Wang, Kai Wang, Xinpei Li, Qinghua Wei, Weihong Chai, Shuzhi Wang, Yu Che, Tingli Lu, Bo Zhang
A key requirement for three-dimensional printing (3-DP) at room temperature of medical implants depends on the availability of printable and biocompatible binder-powder systems. Different concentration polyvinyl alcohol (PVA) and phosphoric acid solutions were chosen as the binders to make the artificial stent biocompatible with sufficient compressive strength. In order to achieve an optimum balance between the bioceramic powder and binder solution, the biocompatibility and mechanical properties of these artificial stent samples were tested using two kinds of binder solutions...
2017: PloS One
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