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https://www.readbyqxmd.com/read/28446781/inkjet-printing-of-high-performance-transistors-with-micron-order-chemically-set-gaps
#1
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/28446020/direct-writing-of-microfluidic-footpaths-by-pyro-ehd-printing
#2
Sara Coppola, Giuseppe Nasti, Michele Todino, Federico Olivieri, Veronica Vespini, Pietro Ferraro
A direct writing method for fabricating microfluidic footpaths by pyro-Electrohydrodynamic (EHD) jet printing is reported. Here we propose the use of a nozzle-free 3D printing technique for the fabrication of printed structures that can be embedded in a variety of soft, transparent, flexible and biocompatible polymers, and thus easily integrated into lab-on-chip (LOC) devices. We prove the advantage of the high resolution and flexibility of pyro-EHD printing for the realization of microfluidic channels well below the standard limit in dimension of conventional ink-jet printing technique and simply adaptable to the final user desires in terms of geometry and materials...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28442744/biomimetic-antimicrobial-cloak-by-graphene-oxide-agar-hydrogel
#3
Massimiliano Papi, Valentina Palmieri, Francesca Bugli, Marco De Spirito, Maurizio Sanguinetti, Carlotta Ciancico, Maria Chiara Braidotti, Silvia Gentilini, Luca Angelani, Claudio Conti
Antibacterial surfaces have an enormous economic and social impact on the worldwide technological fight against diseases. However, bacteria develop resistance and coatings are often not uniform and not stable in time. The challenge is finding an antibacterial coating that is biocompatible, cost-effective, not toxic, and spreadable over large and irregular surfaces. Here we demonstrate an antibacterial cloak by laser printing of graphene oxide hydrogels mimicking the Cancer Pagurus carapace. We observe up to 90% reduction of bacteria cells...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28441338/effects-of-3d-printed-polycaprolactone-%C3%AE-tricalcium-phosphate-membranes-on-guided-bone-regeneration
#4
Jin-Hyung Shim, Joo-Yun Won, Jung-Hyung Park, Ji-Hyeon Bae, Geunseon Ahn, Chang-Hwan Kim, Dong-Hyuk Lim, Dong-Woo Cho, Won-Soo Yun, Eun-Bin Bae, Chang-Mo Jeong, Jung-Bo Huh
This study was conducted to compare 3D-printed polycaprolactone (PCL) and polycaprolactone/β-tricalcium phosphate (PCL/β-TCP) membranes with a conventional commercial collagen membrane in terms of their abilities to facilitate guided bone regeneration (GBR). Fabricated membranes were tested for dry and wet mechanical properties. Fibroblasts and preosteoblasts were seeded into the membranes and rates and patterns of proliferation were analyzed using a kit-8 assay and by scanning electron microscopy. Osteogenic differentiation was verified by alizarin red S and alkaline phosphatase (ALP) staining...
April 25, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28440728/characterization-of-chemical-contaminants-generated-by-a-desktop-fused-deposition-modeling-3-dimensional-printer
#5
Aleksandr B Stefaniak, Ryan F LeBouf, Jinghai Yi, Jason Ham, Timothy Nurkewicz, Diane E Schwegler-Berry, Bean T Chen, J Raymond Wells, Matthew G Duling, Robert B Lawrence, Stephen B Martin, Alyson R Johnson, M Abbas Virji
Printing devices are known to emit chemicals into the indoor atmosphere. Understanding factors that influence release of chemical contaminants from printers is necessary to develop effective exposure assessment and control strategies. In this study, a desktop fused deposition modeling (FDM) 3-D printer using acrylonitrile butadiene styrene (ABS) or polylactic acid (PLA) filaments and two monochrome laser printers were evaluated in a 0.5 m(3) chamber. During printing, chamber air was monitored for vapors using a real-time photoionization detector (results expressed as isobutylene equivalents) to measure total volatile organic compound (TVOC) concentrations, evacuated canisters to identify specific VOCs by off-line gas chromatography-mass spectrometry (GC-MS) analysis, and liquid bubblers to identify carbonyl compounds by GC-MS...
April 25, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28439415/stretchable-biofuel-cells-as-wearable-textile-based-self-powered-sensors
#6
Itthipon Jeerapan, Juliane R Sempionatto, Adriana Pavinatto, Jung-Min You, Joseph Wang
Highly stretchable textile-based biofuel cells (BFCs), acting as effective self-powered sensors, have been fabricated using screen-printing of customized stress-enduring inks. Due to synergistic effects of nanomaterial-based engineered inks and the serpentine designs, these printable bioelectronic devices endure severe mechanical deformations, e.g., stretching, indentation, or torsional twisting. Glucose and lactate BFCs with the single enzyme and membrane-free configurations generated the maximum power density of 160 and 250 µW cm(-2) with the open circuit voltages of 0...
December 21, 2016: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28438549/poly-methyl-vinyl-ether-co-maleic-acid-pectin-based-hydrogel-forming-systems-gel-film-and-microneedles
#7
Yusuf Kemal Demir, Ayşegül Ülkü Metin, Betül Şatıroğlu, Mehmet Ertuğrul Solmaz, Veysel Kayser, Karsten Mäder
Cross-linking of natural and synthetic polymers is widely explored to achieve the desired material properties (mechanical strength, drug loading capacity, swelling and erosion rates). However, the potential of polymers produced by crosslinking poly (methyl vinyl ether-co-maleic acid) (PMVE/MA) and pectin (PE) in pharmaceutics is mainly unexplored so far. We have investigated the effect of various esterification conditions and pectin content on the physicochemical properties. Materials have been characterized by fourier transform infrared, differential scanning calorimetry and scanning electron microscopy...
April 21, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28436054/low-cost-manufacturing-of-bioresorbable-conductors-by-evaporation-condensation-mediated-laser-printing-and-sintering-of-zn-nanoparticles
#8
Wan Shou, Bikram K Mahajan, Brandon Ludwig, Xiaowei Yu, Joshua Staggs, Xian Huang, Heng Pan
Currently, bioresorbable electronic devices are predominantly fabricated by complex and expensive vacuum-based integrated circuit (IC) processes. Here, a low-cost manufacturing approach for bioresorbable conductors on bioresorbable polymer substrates by evaporation-condensation-mediated laser printing and sintering of Zn nanoparticle is reported. Laser sintering of Zn nanoparticles has been technically difficult due to the surface oxide on nanoparticles. To circumvent the surface oxide, a novel approach is discovered to print and sinter Zn nanoparticle facilitated by evaporation-condensation in confined domains...
April 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28434454/measuring-to-improve-medication-reconciliation-in-a-large-subspecialty-outpatient-practice
#9
Elizabeth Kern, Meg B Dingae, Esther L Langmack, Candace Juarez, Gary Cott, Sarah K Meadows
BACKGROUND: To assess performance in medication reconciliation (med rec)-the process of comparing and reconciling patients' medication lists at clinical transition points-and demonstrate improvement in an outpatient setting, sustainable and valid measures are needed. METHODS: An interdisciplinary team at National Jewish Health (Denver) attempted to improve med rec in an ambulatory practice serving patients with respiratory and related diseases. Interventions, which were aimed at physicians, nurses (RNs), and medical assistants, involved changes in practice and changes in documentation in the electronic health record (EHR)...
May 2017: Joint Commission Journal on Quality and Patient Safety
https://www.readbyqxmd.com/read/28426922/feasibility-and-acceptability-of-healthy-directions-a-lifestyle-intervention-for-adults-with-lung-cancer
#10
Amanda C Blok, Traci M Blonquist, Manan M Nayak, Darryl Somayaji, Scott E Crouter, Laura L Hayman, Yolonda L Colson, Raphael Bueno, Karen M Emmons, Mary E Cooley
OBJECTIVE: The aims of this feasibility study of an adapted lifestyle intervention for adults with lung cancer were to: 1) determine rates of enrollment, attrition and completion of five nurse-patient contacts, 2) examine demographic characteristics of those more likely to enroll into the program, 3) determine acceptability of the intervention, and 4) identify patient preferences for the format of supplemental educational intervention materials. METHODS: This study used a single arm, pre-and post-test design...
April 20, 2017: Psycho-oncology
https://www.readbyqxmd.com/read/28426302/innovations-in-population-health-surveillance-using-electronic-health-records-for-chronic-disease-surveillance
#11
Sharon E Perlman, Katharine H McVeigh, Lorna E Thorpe, Laura Jacobson, Carolyn M Greene, R Charon Gwynn
With 87% of providers using electronic health records (EHRs) in the United States, EHRs have the potential to contribute to population health surveillance efforts. However, little is known about using EHR data outside syndromic surveillance and quality improvement. We created an EHR-based population health surveillance system called the New York City (NYC) Macroscope and assessed the validity of diabetes, hyperlipidemia, hypertension, smoking, obesity, depression, and influenza vaccination indicators. The NYC Macroscope uses aggregate data from a network of outpatient practices...
April 20, 2017: American Journal of Public Health
https://www.readbyqxmd.com/read/28422483/transparent-flexible-multifunctional-nanostructured-architectures-for-nonoptical-readout-and-proximity-and-pressure-sensing
#12
Mohit Rameshchandra Kulkarni, Rohit Abraham John, Mayank Rajput, Naveen Tiwari, Natalia Yantara, Anh Chien Nguyen, Nripan Mathews
Electronic skins need to be versatile and able to detect multiple inputs beyond simple pressure and touch while having attributes of transparency and facile manufacturability. Herein, we demonstrate a versatile nanostructured transparent sensor capable of detecting wide range of pressures and proximity as well as novel nonoptical detection of printed patterns. The architecture and fabrication processes are straightforward and show robustness to repeated cycling and testing. The sensor displays good sensitivity and stability from 30 Pa to 5 kPa without the use of microstructuration and is conformal and sensitive to be utilized as a wrist-based heart-rate monitor...
April 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28417536/stretchable-and-soft-electronics-using-liquid-metals
#13
REVIEW
Michael D Dickey
The use of liquid metals based on gallium for soft and stretchable electronics is discussed. This emerging class of electronics is motivated, in part, by the new opportunities that arise from devices that have mechanical properties similar to those encountered in the human experience, such as skin, tissue, textiles, and clothing. These types of electronics (e.g., wearable or implantable electronics, sensors for soft robotics, e-skin) must operate during deformation. Liquid metals are compelling materials for these applications because, in principle, they are infinitely deformable while retaining metallic conductivity...
April 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28414950/a-nanobiosensor-composed-of-exfoliated-graphene-oxide-and-gold-nano-urchins-for-detection-of-gmo-products
#14
Zahra Aghili, Navid Nasirizadeh, Adeleh Divsalar, Shahram Shoeibi, Parichehreh Yaghmaei
Genetically Modified Organisms, have been entered our food chain and detection of these organisms in market products are still the main challenge for scientists. Among several developed detection/quantification methods for detection of these organisms, the electrochemical nanobiosensors are the most attended which are combining the advantages of using nanomaterials, electrochemical methods and biosensors. In this research, a novel and sensitive electrochemical nanobiosensor for detection/quantification of these organisms have been developed using nanomaterials; Exfoliated Graphene Oxide and Gold Nano-Urchins for modification of the screen-printed carbon electrode, and also applying a specific DNA probe as well as hematoxylin for electrochemical indicator...
March 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28412790/-a-preliminary-study-of-three-dimensional-bio-printing-by-polycaprolactone-and-periodontal-ligament-stem-cells
#15
J Xu, M Hu
Objective: To investigate the technical scheme of three-dimensional (3D) bio-printing by polycaprolactone (PCL) and periodontal ligament stem cells (PDLSC). Methods: To manufacture a 3D bio-printing body, PDLSC were used as seed cells, and polycaprolactone (PCL) was used as the 3D printing scaffold material. Print size was designed at 13.0 mm×13.0 mm, and mesh size was 0.25 mm×0.25 mm (group A) and 0.75 mm×0.75 mm (group B). Cell counting kit-8 was used to detect the proliferation of PDLSC on day 1, day 3 and day 5 respectively...
April 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28409702/providing-health-information-to-latino-farmworkers-the-case-of-the-affordable-care-act
#16
Thomas A Arcury, Anna Jensen, Mackenzie Mann, Joanne C Sandberg, Melinda F Wiggins, Jennifer W Talton, Mark A Hall, Sara A Quandt
OBJECTIVE: Providing health program information to vulnerable communities, such as Latino farmworkers, is difficult. This analysis describes the manner in which farmworkers receive information about the Affordable Care Act, comparing farmworkers to other Latinos. METHODS: Interviews were conducted with 100 Latino farmworkers and 100 urban Latino North Carolina residents in 2015. RESULTS: Most farmworkers had received health information from a community organization...
April 14, 2017: Journal of Agromedicine
https://www.readbyqxmd.com/read/28406226/fast-optoelectric-printing-of-plasmonic-nanoparticles-into-tailored-circuits
#17
José A Rodrigo
Plasmonic nanoparticles are able to control light at nanometre-scale by coupling electromagnetic fields to the oscillations of free electrons in metals. Deposition of such nanoparticles onto substrates with tailored patterns is essential, for example, in fabricating plasmonic structures for enhanced sensing. This work presents an innovative micro-patterning technique, based on optoelectic printing, for fast and straightforward fabrication of curve-shaped circuits of plasmonic nanoparticles deposited onto a transparent electrode often used in optoelectronics, liquid crystal displays, touch screens, etc...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28402626/a-combination-of-boron-nitride-nanotubes-and-cellulose-nanofibers-for-the-preparation-of-a-nanocomposite-with-high-thermal-conductivity
#18
Xiaoliang Zeng, Jiajia Sun, Yimin Yao, Rong Sun, Jian-Bin Xu, Ching-Ping Wong
With the current development of modern electronics toward miniaturization, high-degree integration and multifunctionalization, considerable heat is accumulated, which results in the thermal failure or even explosion of modern electronics. The thermal conductivity of materials has thus attracted much attention in modern electronics. Although polymer composites with enhanced thermal conductivity are expected to address this issue, achieving higher thermal conductivity (above 10 W m(-1) K(-1)) at filler loadings below 50...
April 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28402291/multi-pulse-flash-light-sintering-of-bimodal-cu-nanoparticle-ink-for-highly-conductive-printed-cu-electrodes
#19
Myeong-Hyeon Yu, Sung-Jun Joo, Hak-Sung Kim
In this work, bimodal Cu nano-inks composed of two different sizes of Cu nanoparticles (NPs) (40 and 100 nm in diameter) were successfully sintered with a multi-pulse flashlight sintering technique. Bimodal Cu nano-inks were fabricated and printed with various mixing ratios and subsequently sintered by a flash light sintering method. The effects of the flashlight sintering conditions, including irradiation energy and pulse number, were investigated to optimize the sintering conditions. A detailed mechanism of the sintering of bimodal Cu nano-ink was also studied via real-time resistance measurement during the sintering process...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28397956/a-project-course-sequence-in-innovation-and-commercialization-of-medical-devices
#20
Alan W Eberhardt, Shea Tillman, Brandon Kirkland, Brandon Sherrod
There exists a need for educational processes in which students gain experience with design and commercialization of medical devices. This manuscript describes the implementation of, and assessment results from, the first year offering of a "project course" sequence in a Master of Engineering (MEng) in Design and Commercialization at our institution. The three-semester course sequence focused on developing and applying hands-on skills that contribute to product development to address medical device needs found within our university hospital and local community...
April 11, 2017: Journal of Biomechanical Engineering
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