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https://www.readbyqxmd.com/read/28715617/ionophore-based-anion-selective-optode-printed-on-cellulose-paper
#1
Xuewei Wang, Qi Zhang, Changwoo Nam, Michael Hickner, Mollie Mahoney, Mark Meyerhoff
We report a general anion sensing platform based on a portable and cost-effective ion-selective optode and a smartphone detector equipped with a color analysis app. In contrast to traditional anion-selective optodes using a hydrophobic polymer and/or plasticizer to dissolve hydrophobic sensing elements, the new optode relies on hydrophilic cellulose paper. The anion ionophore and a lipophilic pH indicator are inkjet-printed and adsorbed on paper and form a "dry" hydrophobic sensing layer. Porous cellulose sheets also allow the sensing site to be modified with dried buffer that prevents any sample pH dependence of the observed color change...
July 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28695733/efficient-all-solution-processed-quantum-dot-light-emitting-diodes-based-on-ink-jet-printing-technique
#2
Yang Liu, Fushan Li, Zhongwei Xu, Congxiu Zheng, Tailiang Guo, Xiangwei Xie, Lei Qian, Dong Fu, Xiaolin Yan
Quantum dot light emitting diodes (QLEDs) are increasingly attractive owing to their compatibility with ink-jet printing process and the potential application in low-cost large-area full-color pixelated display. The strategy for controlling the morphology of quantum dot layer is definitely critical for realizing all-solution processed QLEDs with high performance, which certainly requires in-depth thinking regarding the design of ink composition and their optimization in the printing process. Herein, by carefully controlling the quantum dot ink composition and physicochemical properties, we demonstrate that the viscosity, contact angle and the three-phase contact line moving would affect the final morphology of quantum dots film formed by inkjet printing...
July 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28682595/scalable-fabrication-and-integration-of-graphene-microsupercapacitors-through-full-inkjet-printing
#3
Jiantong Li, Szymon Sollami Delekta, Panpan Zhang, Sheng Yang, Martin R Lohe, Xiaodong Zhuang, Xinliang Feng, Mikael Östling
A simple full-inkjet-printing technique is developed for the scalable fabrication of graphene-based microsupercapacitors (MSCs) on various substrates. High-performance graphene inks are formulated by integrating the electrochemically exfoliated graphene with a solvent exchange technique to reliably print graphene interdigitated electrodes with tunable geometry and thickness. Along with the printed polyelectrolyte, poly(4-styrenesulfonic acid), the fully printed graphene-based MSCs attain the highest areal capacitance of ∼0...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28673860/3d-printing-of-tablets-using-inkjet-with-uv-photoinitiation
#4
Elizabeth A Clark, Morgan R Alexander, Derek J Irvine, Clive J Roberts, Martin J Wallace, Sonja Sharpe, Jae Yoo, Richard J M Hague, Chris J Tuck, Ricky D Wildman
Additive manufacturing (AM) offers significant potential benefits in the field of drug delivery and pharmaceutical/medical device manufacture. Of AM processes, 3D inkjet printing enables precise deposition of a formulation, whilst offering the potential for significant scale up or scale out as a manufacturing platform. This work hypothesizes that suitable solvent based ink formulations can be developed that allow the production of solid dosage forms that meet the standards required for pharmaceutical tablets, whilst offering a platform for flexible and personalised manufacture...
June 30, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28668378/3d-inkjet-printing-of-tablets-exploiting-bespoke-complex-geometries-for-controlled-and-tuneable-drug-release
#5
Mary Kyobula, Aremu Adedeji, Morgan R Alexander, Ehab Saleh, Ricky Wildman, Ian Ashcroft, Paul R Gellert, Clive J Roberts
A hot melt 3D inkjet printing method with the potential to manufacture formulations in complex and adaptable geometries for the controlled loading and release of medicines is presented. This first use of a precisely controlled solvent free inkjet printing to produce drug loaded solid dosage forms is demonstrated using a naturally derived FDA approved material (beeswax) as the drug carrier and fenofibrate as the drug. Tablets with bespoke geometries (honeycomb architecture) were fabricated. The honeycomb architecture was modified by control of the honeycomb cell size, and hence surface area to enable control of drug release profiles without the need to alter the formulation...
June 28, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28643788/terahertz-saturable-absorbers-from-liquid-phase-exfoliation-of-graphite
#6
Vezio Bianchi, Tian Carey, Leonardo Viti, Lianhe Li, Edmund H Linfield, A Giles Davies, Alessandro Tredicucci, Duhee Yoon, Panagiotis G Karagiannidis, Lucia Lombardi, Flavia Tomarchio, Andrea C Ferrari, Felice Torrisi, Miriam S Vitiello
Saturable absorbers (SA) operating at terahertz (THz) frequencies can open new frontiers in the development of passively mode-locked THz micro-sources. Here we report the fabrication of THz SAs by transfer coating and inkjet printing single and few-layer graphene films prepared by liquid phase exfoliation of graphite. Open-aperture z-scan measurements with a 3.5 THz quantum cascade laser show a transparency modulation ∼80%, almost one order of magnitude larger than that reported to date at THz frequencies...
June 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28640182/paper-as-active-layer-in-inkjet-printed-capacitive-humidity-sensors
#7
Cristina Gaspar, Juuso Olkkonen, Soile Passoja, Maria Smolander
An inkjet-printed relative humidity sensor based on capacitive changes which responds to different humidity levels in the environment is presented in this work. The inkjet-printed silver interdigitated electrodes configuration on the paper substrate allowed for the fabrication of a functional proof-of-concept of the relative humidity sensor, by using the paper itself as a sensing material. The sensor sensitivity in terms of relative humidity changes was calculated to be around 2 pF/RH %. The response time against different temperature steps from 3 to 85 °C was fairly constant (about 4-5 min), and it was considered fast for the aimed application, a smart label...
June 22, 2017: Sensors
https://www.readbyqxmd.com/read/28634958/bioprinting-cartilage-tissue-from-mesenchymal-stem-cells-and-peg-hydrogel
#8
Guifang Gao, Karen Hubbell, Arndt F Schilling, Guohao Dai, Xiaofeng Cui
Bioprinting based on thermal inkjet printing is one of the most attractive enabling technologies for tissue engineering and regeneration. During the printing process, cells, scaffolds , and growth factors are rapidly deposited to the desired two-dimensional (2D) and three-dimensional (3D) locations. Ideally, the bioprinted tissues are able to mimic the native anatomic structures in order to restore the biological functions. In this study, a bioprinting platform for 3D cartilage tissue engineering was developed using a commercially available thermal inkjet printer with simultaneous photopolymerization ...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28621773/an-all-inkjet-printed-flexible-uv-photodetector
#9
Yuhui Dong, Yousheng Zou, Jizhong Song, Jianhai Li, Boning Han, Qingsong Shan, Leimeng Xu, Jie Xue, Haibo Zeng
In this work, a novel concept of the all-inkjet-printed flexible photodetectors based on ZnO nanocrystals with high performance was proposed and demonstrated with emphasis on the influence of different post-treatments including UV light irradiation and high temperature annealing. The photodetectors based on UV-treated ZnO nanocrystal films exhibit a responsivity and an on/off ratio as high as 0.14 A W(-1) and >10(3), respectively, which are better than the thermally treated devices. The high performance of ZnO nanocrystal-based photodetectors originates from unique band-edge modulation among the nanoparticles, where the existence of Schottky barriers leads to a low dark current and gives rise to a fast photoelectric response...
June 29, 2017: Nanoscale
https://www.readbyqxmd.com/read/28598163/structural-color-patterns-on-paper-fabricated-by-inkjet-printer-and-their-application-in-anticounterfeiting
#10
Suli Wu, Baoqi Liu, Xin Su, Shufen Zhang
Inkjet-printed structural color patterns have attracted great attention in recent years because of their broadly promising applications. However, the patterns are usually fabricated on pretreated plastic substrates. Herein a convenient inkjet printing method was developed to fabricate large-scale computer-designed structural color patterns on photo paper without any treatment using inks containing monodisperse CdS spheres. By this strategy, not only were the single-color and multicolor structural color patterns on paper successfully obtained, but also invisible photonic anticounterfeiting was achieved without any external stimuli...
June 12, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28586316/direct-3d-cell-printing-of-human-skin-with-functional-transwell-system
#11
Byoung Soo Kim, Jung-Seob Lee, Ge Gao, Dong-Woo Cho
Three-dimensional (3D) cell-printing has been emerging as a promising technology with which to build up human skin models by enabling rapid and versatile design. Despite the technological advances, challenges remain in the development of fully functional models that recapitulate complexities in the native tissue. Moreover, although several approaches have been explored for the development of biomimetic human skin models, the present skin models based on multistep fabrication methods using polydimethylsiloxane chips and commercial transwell inserts could be tackled by leveraging 3D cell-printing technology...
June 6, 2017: Biofabrication
https://www.readbyqxmd.com/read/28585688/preliminary-study-on-determining-the-sequence-of-intersecting-lines-by-fluorescence-technique
#12
Biao Li, Guo Liang Ouyang, Peng Nan Zhao
The determination of the sequence of intersecting lines is an important part of questioned document examinations. A fluorescence technique was used to determine the sequence of heterogeneous intersecting lines produced using inkpad ink, stamp-pad ink, ballpoint pens, gel pens, fountain pens, colorants of carbon paper, photocopiers, laser printers, and inkjet printers. A SteREO Discovery.V20 equipped with the ZEN Blue Lite software was chosen to perform the tests.As the results obtained from the study were positive under most conditions, the fluorescence technique was found to be very successful in determining the sequence of intersecting lines from ballpoint pen, gel pen, fountain pen, photocopier, laser and inkjet printers, and inkpad inks...
June 6, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28580906/modelling-the-evaporation-of-nanoparticle-suspensions-from-heterogeneous-surfaces
#13
Christopher Chalmers, Roger Smith, Andrew J Archer
We present a kinetic Monte Carlo (KMC) grid-based model for the drying of drops of a nanoparticle suspension upon a heterogeneous surface. The model consists of a generalised lattice-gas in which the interaction parameters in the Hamiltonian can be varied to model different properties of the materials involved. We show how to choose correctly the interactions, to minimise the effects of the underlying grid so that hemispherical droplets form. We also include the effects of surface roughness to examine the effects of contact-line pinning on the dynamics...
June 5, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28579922/solution-of-an-elusive-pigment-crystal-structure-from-a-thin-film-a-combined-x-ray-diffraction-and-computational-study
#14
Andrew O F Jones, Christian Röthel, Roman Lassnig, O N Bedoya-Martínez, Paul Christian, Ingo Salzmann, Birgit Kunert, Adolf Winkler, Roland Resel
Epindolidione, a hydrogen-bonded derivative of the organic semiconductor tetracene, is an organic pigment which has previously been used to produce stable OFETs with relatively high hole mobilities. Despite its use as an inkjet pigment and organic semiconductor, the crystal structure of epindolidione has proved elusive and is currently unknown. In this work, we report a crystal structure solution of epindolidione determined from vapor deposited thin films using a combined experimental and theoretical approach...
April 14, 2017: CrystEngComm
https://www.readbyqxmd.com/read/28558136/multiphoton-direct-laser-writing-and-3d-imaging-of-polymeric-freestanding-architectures-for-cell-colonization
#15
Angelo Accardo, Marie-Charline Blatché, Rémi Courson, Isabelle Loubinoux, Christophe Thibault, Laurent Malaquin, Christophe Vieu
The realization of 3D architectures for the study of cell growth, proliferation, and differentiation is a task of fundamental importance for both technological and biological communities involved in the development of biomimetic cell culture environments. Here we report the fabrication of 3D freestanding scaffolds, realized by multiphoton direct laser writing and seeded with neuroblastoma cells, and their multitechnique characterization using advanced 3D fluorescence imaging approaches. The high accuracy of the fabrication process (≈200 nm) allows a much finer control of the micro- and nanoscale features compared to other 3D printing technologies based on fused deposition modeling, inkjet printing, selective laser sintering, or polyjet technology...
May 30, 2017: Small
https://www.readbyqxmd.com/read/28546896/study-of-the-correlation-between-sensing-performance-and-surface-morphology-of-inkjet-printed-aqueous-graphene-based-chemiresistors-for-no2-detection
#16
F Villani, C Schiattarella, T Polichetti, R Di Capua, F Loffredo, B Alfano, M L Miglietta, E Massera, L Verdoliva, G Di Francia
The extremely high sensitivity to the external environment and the high specific surface area, as well as the absence of bulk phenomena that could interfere with the response signal, make graphene highly attractive for the applications in the field of sensing. Among the various methods for producing graphene over large areas, liquid phase exfoliation (LPE) appears to be very promising, especially if combined with inkjet printing (IJP), which offers several advantages, including the selective and controlled deposition of small ink volumes and the versatility of the exploitable inks and substrates...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28542948/the-capability-of-raman-microspectroscopy-to-differentiate-printing-inks
#17
Chelsea E Johnson, Paul Martin, Katherine A Roberts, Tatiana Trejos, Ruthmara Corzo, Jose R Almirall, Alan M Safer
This study applies Raman microspectroscopy to differentiate the chemical components in printing inks of different brands, colors, and type using the 532 nm and 785 nm excitation wavelengths. Spectra were collected from 319 inks (78 inkjet, 76 toner, 79 offset, and 86 intaglio) representing various colors. Comparisons were performed to calculate discrimination capability percentages for each ink type. Overall, Raman microspectroscopy differentiates according to the following hierarchy: intaglio (96%), inkjet (92%), offset (90%), and toner (61%)...
May 24, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28541035/three-dimensional-printing-of-silver-microarchitectures-using-newtonian-nanoparticle-inks
#18
Sanghyeon Lee, Jung Hyun Kim, Muhammad Wajahat, Hwakyung Jeong, Won Suk Chang, Sung Ho Cho, Ji Tae Kim, Seung Kwon Seol
Although three-dimensional (3D) printing has recently emerged as a technology to potentially bring about the next industrial revolution, the limited selection of usable materials restricts its use to simple prototyping. In particular, metallic 3D printing with submicrometer spatial resolution is essential for the realization of 3D-printed electronics. Herein, a meniscus-guided 3D printing method that exploits a low-viscosity (∼7 mPa·s) silver nanoparticle (AgNP) ink meniscus with Newtonian fluid characteristics (which is compatible with conventional inkjet printers) to fabricate 3D silver microarchitectures is reported...
June 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28540370/ultralow-friction-of-ink-jet-printed-graphene-flakes
#19
R Buzio, A Gerbi, S Uttiya, C Bernini, A E Del Rio Castillo, F Palazon, A S Siri, V Pellegrini, L Pellegrino, F Bonaccorso
We report the frictional response of few-layer graphene (FLG) flakes obtained by the liquid phase exfoliation (LPE) of pristine graphite. To this end, we inkjet print FLG on bare and hexamethyldisilazane-terminated SiO2 substrates, producing micrometric patterns with nanoscopic roughness that are investigated by atomic force microscopy. Normal force spectroscopy and atomically-resolved morphologies indicate reduced surface contamination by solvents after a vacuum annealing process. Notably, the printed FLG flakes show ultralow friction comparable to that of micromechanically exfoliated graphene flakes...
June 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534907/inkjet-printed-highly-transparent-and-flexible-graphene-micro-supercapacitors
#20
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%)...
June 1, 2017: Nanoscale
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