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https://www.readbyqxmd.com/read/28934545/antimicrobial-3d-porous-scaffolds-prepared-by-additive-manufacturing-and-breath-figures
#1
Nelson Vargas Alfredo, Ane Dorronsoro, Aitziber L Cortajarena, Juan Rodriguez-Hernandez
We describe herein a novel strategy for the fabrication of efficient 3D printed antibacterial scaffolds. For this purpose, both the surface topography as well as the chemical composition of 3D scaffolds fabricated by additive manufacturing were modified. The scaffolds were fabricated by fused deposition modeling (FDM) using high impact polystyrene (HIPS) filaments. The surface of the objects was then topographically modified providing materials with porous surfaces by means of the Breath Figures approach. The strategy involves the immersion of the scaffold in a polymer solution during a precise period of time...
September 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28933756/a-disposable-amperometric-sensor-based-on-high-performance-pedot-pss-ionic-liquid-nanocomposite-thin-film-modified-screen-printed-electrode-for-the-analysis-of-catechol-in-natural-water-samples
#2
Francis D Krampa, Yaw Aniweh, Gordon A Awandare, Prosper Kanyong
A conducting polymer-based composite material of poly(3,4-ethylenedioxythiophene) (PEDOT): poly(4-styrenesulfonate) (PSS) doped with different percentages of a room temperature ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF₄]), was prepared and a very small amount of the composite (2.0 µL) was drop-coated on the working area of a screen-printed carbon electrode (SPCE). The SPCE, modified with PEDOT:PSS/IL composite thin-film, was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), profilometry and sessile contact angle measurements...
July 26, 2017: Sensors
https://www.readbyqxmd.com/read/28933439/3d-printing-of-high-strength-aluminium-alloys
#3
John H Martin, Brennan D Yahata, Jacob M Hundley, Justin A Mayer, Tobias A Schaedler, Tresa M Pollock
Metal-based additive manufacturing, or three-dimensional (3D) printing, is a potentially disruptive technology across multiple industries, including the aerospace, biomedical and automotive industries. Building up metal components layer by layer increases design freedom and manufacturing flexibility, thereby enabling complex geometries, increased product customization and shorter time to market, while eliminating traditional economy-of-scale constraints. However, currently only a few alloys, the most relevant being AlSi10Mg, TiAl6V4, CoCr and Inconel 718, can be reliably printed; the vast majority of the more than 5,500 alloys in use today cannot be additively manufactured because the melting and solidification dynamics during the printing process lead to intolerable microstructures with large columnar grains and periodic cracks...
September 20, 2017: Nature
https://www.readbyqxmd.com/read/28930433/high-resolution-graphene-films-for-electrochemical-sensing-via-inkjet-maskless-lithography
#4
John A Hondred, Loreen R Stromberg, Curtis L Mosher, Jonathan C Claussen
Solution-phase printing of nanomaterial-based graphene inks are rapidly gaining interest for fabrication of flexible electronics. However, scalable manufacturing techniques for high-resolution printed graphene circuits are still lacking. Here, we report a patterning technique [i.e., inkjet maskless lithography (IML)] to form high resolution, flexible, graphene films (line widths down to 20 µm) that significantly exceeds the current inkjet printing resolution of graphene (line widths ~ 60 µm). IML uses an inkjet printed polymer lacquer as a sacrificial pattern, viscous spin coated graphene, and a subsequent graphene lift-off to patterned films without the need for pre-fabricated stencils, templates or cleanroom technology (e...
September 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28930347/a-paper-triboelectric-nanogenerator-for-self-powered-electronic-systems
#5
Yanchao Mao, Nan Zhang, Yingjie Tang, Meng Wang, Mingju Chao, Erjun Liang
Paper, as one of the most important inventions of mankind, is still widely used in our daily life. In this study, the paper is explored as a platform for power sources based on the universally known triboelectric friction. A novel paper triboelectric nanogenerator (P-TENG) was successfully developed, which could harvest mechanical energy from ambient sources and generate considerable electrical energy. The maximum power density of the P-TENG reached 53 W m(-2). In addition, the P-TENG possesses a natural advantage of being able to be integrated within a book, and thus can effectively convert mechanical energy from the action of turning book pages into electricity...
September 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28924412/adding-access-to-a-video-magnifier-to-standard-vision-rehabilitation-initial-results-on-reading-performance-and-well-being-from-a-prospective-randomized-study
#6
Mary Lou Jackson, Kimberly A Schoessow, Alexandra Selivanova, Jennifer Wallis
PURPOSE: Both optical and electronic magnification are available to patients with low vision. Electronic video magnifiers are more expensive than optical magnifiers, but they offer additional benefits, including variable magnification and contrast. This study aimed to evaluate the effect of access to a video magnifier (VM) added to standard comprehensive vision rehabilitation (VR). METHODS: In this prospective study, 37 subjects with central field loss were randomized to receive standard VR (VR group, 18 subjects) or standard VR plus VM (VM group, 19 subjects)...
2017: Digital Journal of Ophthalmology: DJO
https://www.readbyqxmd.com/read/28922544/flexible-photodetectors-based-on-novel-functional-materials
#7
REVIEW
Chao Xie, Feng Yan
Flexible photodetectors have attracted a great deal of research interest in recent years due to their great possibilities for application in a variety of emerging areas such as flexible, stretchable, implantable, portable, wearable and printed electronics and optoelectronics. Novel functional materials, including materials with zero-dimensional (0D) and one-dimensional (1D) inorganic nanostructures, two-dimensional (2D) layered materials, organic semiconductors and perovskite materials, exhibit appealing electrical and optoelectrical properties, as well as outstanding mechanical flexibility, and have been widely studied as building blocks in cost-effective flexible photodetection...
September 18, 2017: Small
https://www.readbyqxmd.com/read/28919148/creation-and-dissemination-of-a-multispecialty-gme-curriculum-in-pediatric-and-adolescent-gynecology-the-naspag-resident-education-committee-experiences
#8
Carol Wheeler, K J Browner-Elhanan, Yolanda Evans, Nathalie Fleming, Patricia S Huguelet, Nicole W Karjane, Meredith Loveless, Hina J Talib, Paritosh Kaul
OBJECTIVE: The goal was to develop a multispecialty committee to address deficiencies in pediatric and adolescent gynecology resident education through curricular development under the auspices of the North American Society for Pediatric and Adolescent Gynecology. DESIGN: A multispecialty North American committee was organized to develop both short and long curricula in pediatric and adolescent gynecology (PAG) through a combination of conference calls and face-to-face meetings...
September 14, 2017: Journal of Pediatric and Adolescent Gynecology
https://www.readbyqxmd.com/read/28917761/graphene-nanoribbon-fept-bimetallic-nanoparticles-uric-acid-as-a-novel-magnetic-sensing-layer-of-screen-printed-electrode-for-sensitive-determination-of-ampyra
#9
Pegah Hashemi, Hasan Bagheri, Abbas Afkhami, Salimeh Amidi, Tayyebeh Madrakian
A novel electrochemical sensor for sensitive determination of ampyra (Am) based on graphene nanoribbons modified by iron-platinum bimetallic nanoparticles and uric acid (SPCE/FePtGNR/UA) dropped on the screen-printed carbon electrode (SPCE) surface and magnetically captured onto an SPCE working electrode surface is reported in the present work. The modified nanocomposite and sensing layer was characterized by different techniques, including cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray powdered diffraction (XRD)...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917741/immobilization-of-cytochrome-c-and-its-application-as-electrochemical-biosensors
#10
REVIEW
Zahra Sadat Aghamiri, Mohsen Mohsennia, Hossain-Ali Rafiee-Pour
Cytochrome c (Cyt c) has been used as a model protein to investigate the characters of modified electrodes by many researchers. It has been also employed to construct biosensors to detect hydrogen peroxide, nitrate, superoxide, and etc. Cyt c immobilization techniques, including physical adsorption, entrapment in hydrogel or polymers, layer-by-layer assembly, Langmuir-Blodgett, and covalent attachment are discussed followed by various electrochemical methods applied in the electrode modification. The exploration of some modified protein electrodes, for example, screen printed, microperoxidase and engineered Cyt c are also presented...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28915343/identifying-preferred-format-and-source-of-exercise-information-in-persons-with-multiple-sclerosis-that-can-be-delivered-by-health-care-providers
#11
Yvonne C Learmonth, Brynn C Adamson, Julia M Balto, Chung-Yi Chiu, Isabel M Molina-Guzman, Marcia Finlayson, Barry J Riskin, Robert W Motl
BACKGROUND: There is increasing recognition of the benefits of exercise in individuals with multiple sclerosis (MS), yet the MS population does not engage in sufficient amounts of exercise to accrue health benefits. There has been little qualitative inquiry to establish the preferred format and source for receiving exercise information from health-care providers among persons with MS. OBJECTIVE: We sought to identify the desired and preferred format and source of exercise information for persons with MS that can be delivered through health-care providers...
October 2017: Health Expectations: An International Journal of Public Participation in Health Care and Health Policy
https://www.readbyqxmd.com/read/28902990/high-purity-semiconducting-single-walled-carbon-nanotubes-a-key-enabling-material-in-emerging-electronics
#12
Jacques Lefebvre, Jianfu Ding, Zhao Li, Paul Finnie, Gregory Lopinski, Patrick R L Malenfant
Semiconducting single-walled carbon nanotubes (sc-SWCNTs) are emerging as a promising material for high-performance, high-density devices as well as low-cost, large-area macroelectronics produced via additive manufacturing methods such as roll-to-roll printing. Proof-of-concept demonstrations have indicated the potential of sc-SWCNTs for digital electronics, radiofrequency circuits, radiation hard memory, improved sensors, and flexible, stretchable, conformable electronics. Advances toward commercial applications bring numerous opportunities in SWCNT materials development and characterization as well as fabrication processes and printing technologies...
September 13, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28895874/charge-transport-by-inverse-micelles-in-non-polar-media
#13
Filip Strubbe, Kristiaan Neyts
Charged inverse micelles play an important role in the electrical charging and the electrodynamics of nonpolar colloidal dispersion relevant for applications such as electronic ink displays and liquid toner printing. This review examines the properties and the behavior of charged inverse micelles in microscale devices in the absence of colloidal particles. It is discussed how charge in nonpolar liquids is stabilized in inverse micelles and how conductivity depends on the inverse micelle size, water content and ionic impurities...
September 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28891947/review-of-batteryless-wireless-sensors-using-additively-manufactured-microwave-resonators
#14
REVIEW
Muhammad Usman Memon, Sungjoon Lim
The significant improvements observed in the field of bulk-production of printed microchip technologies in the past decade have allowed the fabrication of microchip printing on numerous materials including organic and flexible substrates. Printed sensors and electronics are of significant interest owing to the fast and low-cost fabrication techniques used in their fabrication. The increasing amount of research and deployment of specially printed electronic sensors in a number of applications demonstrates the immense attention paid by researchers to this topic in the pursuit of achieving wider-scale electronics on different dielectric materials...
September 9, 2017: Sensors
https://www.readbyqxmd.com/read/28891928/high-performance-wireless-ammonia-gas-sensors-based-on-reduced-graphene-oxide-and-nano-silver-ink-hybrid-material-loaded-on-a-patch-antenna
#15
Bian Wu, Xingfei Zhang, Beiju Huang, Yutong Zhao, Chuantong Cheng, Hongda Chen
Reduced graphene oxide (rGO) has been studied as a resistive ammonia gas sensor at room temperature. The sensitive hybrid material composed of rGO and nano-silver ink (Ag-ink) was loaded on a microstrip patch antenna to realize high-performance wireless ammonia sensors. The material was investigated using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Firstly, interdigital electrodes (IDEs) printed on the polyethylene terephthalate (PET) by direct printing were employed to measure the variation of resistance of the sensitive material with the ammonia concentration...
September 9, 2017: Sensors
https://www.readbyqxmd.com/read/28891805/graphene-vertically-aligned-carbon-nanotube-hybrid-on-pdms-as-stretchable-electrodes
#16
Junjun Ding, Shichen Fu, Runzhi Zhang, Eric Peter Boon, Woo Lee, Frank T Fisher, Eui-Hyeok Yang
Stretchable electrodes are a critical component for flexible electronics such as displays, energy devices, and wearable sensors. Carbon nanotubes (CNTs) and graphene have been considered for flexible electrode applications, due to their mechanical strength, high carrier mobility, and excellent thermal conductivity. Vertically aligned carbon nanotubes (VACNTs) provide the possibility to serve as interconnects to graphene sheets as stretchable electrodes that could maintain high electrical conductivity under large tensile strain...
September 11, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28887503/stretchable-conductive-elastomer-for-wireless-wearable-communication-applications
#17
Zhibo Chen, Jingtian Xi, Wei Huang, Matthew M F Yuen
Wearable devices have provided noninvasive and continuous monitoring of physiological parameters in healthcare applications. However, for the comfortable applications of wearable devices on human body, two key requirements are to replace conventional bulky devices into soft and deformable ones and to have wireless wearable communication. In this paper we present a simple, low-cost and highly efficient all-elastomeric conductor that can be used in a soft radio-frequency (RF) transmission line and antenna. We show a stretchable transmission line and two stretchable antennas fabricated with conventional screen printing...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28875861/therapeutic-monoclonal-antibodies-and-multiple-sclerosis-the-essentials
#18
Ioannis Heliopoulos, Athanasia Patousi
BACKGROUND: Monoclonal antibodies (mAbs) are now established as targeted therapies for malignancies, transplant rejection, autoimmune and infectious diseases. Two monoclonal antibodies are available for treatment and other antibodies are currently being tested in multiple sclerosis (MS) patients. OBJECTIVES: The purpose of the present review paper is to outline the antibody engineering technologies, the immunologic and pharmacologic concepts of mΑbs and the current status of treatment in MS with emphasis on clinical efficacy and safety...
September 6, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/28875572/hybrid-3d-printing-of-soft-electronics
#19
Alexander D Valentine, Travis A Busbee, John William Boley, Jordan R Raney, Alex Chortos, Arda Kotikian, John Daniel Berrigan, Michael F Durstock, Jennifer A Lewis
Hybrid 3D printing is a new method for producing soft electronics that combines direct ink writing of conductive and dielectric elastomeric materials with automated pick-and-place of surface mount electronic components within an integrated additive manufacturing platform. Using this approach, insulating matrix and conductive electrode inks are directly printed in specific layouts. Passive and active electrical components are then integrated to produce the desired electronic circuitry by using an empty nozzle (in vacuum-on mode) to pick up individual components, place them onto the substrate, and then deposit them (in vacuum-off mode) in the desired location...
September 6, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28872583/design-of-a-sensor-system-for-on-line-monitoring-of-contact-pressure-in-chalcographic-printing
#20
José Antonio Jiménez, Francisco Javier Meca, Enrique Santiso, Pedro Martín
Chalcographic printer is the name given to a specific type of press which is used to transfer the printing of a metal-based engraved plate onto paper. The printing system consists of two rollers for pressing and carrying a metal plate onto which an engraved inked plate is placed. When the driving mechanism is operated, the pressure exerted by the rollers, also called contact pressure, allows the engraved image to be transferred into paper, thereby obtaining the final image. With the aim of ensuring the quality of the result, in terms of good and even transfer of ink, the contact pressure must be uniform...
September 5, 2017: Sensors
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