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Hao Jiang, Bozena Kaminska
To enable customized manufacturing of structural colors for commercial applications, up-scalable, low-cost, rapid, and versatile printing techniques are highly demanded. In this paper, we introduce a viable strategy for scaling up production of custom-input images by patterning individual structural colors on separate layers which are then vertically stacked and recombined into full-color images. By applying this strategy on molded-ink-on-nanostructured-surface printing, we present an industry-applicable inkjet structural color printing technique termed as multilayer molded-ink-on-nanostructured-surface (M-MIONS) printing, in which structural color pixels are molded on multiple layers of nanostructured surfaces...
February 14, 2018: ACS Nano
Vahid Hamedpour, Geert J Postma, Edwin van den Heuvel, Jeroen J Jansen, Koji Suzuki, Daniel Citterio
This manuscript reports on the application of chemometric methods for the development of an optimized microfluidic paper-based analytical device (μPAD). As an example, we applied chemometric methods for both device optimization and data processing of results of a colorimetric uric acid assay. Box-Behnken designs (BBD) were utilized for the optimization of the device geometry and the amount of thermal inkjet-deposited assay reagents, which affect the assay performance. Measurement outliers were detected in real time by partial least squares discriminant analysis (PLS-DA) of scanned images...
February 12, 2018: Analytical and Bioanalytical Chemistry
R N Nurdillayeva, A B Oshido, T A Bamford, O El-Zubir, A Houlton, J Hedley, A R Pike, B R Horrocks
Cadmium sulphide can be templated on λ-DNA molecules to form an aqueous dispersion of CdS/λ-DNA nanowires. Subsequent addition of ethylene glycol to 50% v/v is sufficient to formulate an ink suitable for printing using piezoelectric drop-on-demand technology. Printed droplet arrays show a coffee-ring morphology of individual deposits by fluorescence and Raman microscopy, but upon increasing the number of layers of printed material by repeated printing over each droplet, the dry deposit approaches closer to a disc shape...
February 12, 2018: Nanotechnology
Kento Kuwahara, Kentaro Yamada, Koji Suzuki, Daniel Citterio
This paper presents the determination of complex binding stoichiometry for colorimetric metal indicators according to the Job plot method by means of an office inkjet printer in combination with digital colour analysis. In contrast to the conventional solution-based analysis involving manual preparation of many mixed solutions, the elaborated inkjet-based approach allows convenient automated mixing of metal salt and indicator solutions in various ratios on a paper substrate. Inkjet-deposited liquid volumes and mixing ratios were controlled by simple colour value setting on a PC...
February 12, 2018: Analyst
Lanlan Li, Lijia Pan, Zhong Ma, Ke Yan, Wen Cheng, Yi Shi, Guihua Yu
Multiplexing, one of the main trends in biosensors, aims to detect several analytes simultaneously by integrating miniature sensors on a chip. However, precisely depositing electrode materials and selective enzymes on distinct microelectrode arrays remains an obstacle to massively produced multiplexed sensors. Here, we report on a "drop-on-demand" inkjet printing process to fabricate multiplexed biosensors based on nanostructured conductive hydrogels, in which the electrode material and several kinds of enzymes were printed on the electrode arrays one by one by employing a multi-nozzle inkjet system...
February 8, 2018: Nano Letters
Karthik Tappa, Udayabhanu Jammalamadaka
The success of an implant depends on the type of biomaterial used for its fabrication. An ideal implant material should be biocompatible, inert, mechanically durable, and easily moldable. The ability to build patient specific implants incorporated with bioactive drugs, cells, and proteins has made 3D printing technology revolutionary in medical and pharmaceutical fields. A vast variety of biomaterials are currently being used in medical 3D printing, including metals, ceramics, polymers, and composites. With continuous research and progress in biomaterials used in 3D printing, there has been a rapid growth in applications of 3D printing in manufacturing customized implants, prostheses, drug delivery devices, and 3D scaffolds for tissue engineering and regenerative medicine...
February 7, 2018: Journal of Functional Biomaterials
Marc Colaco, Daniel A Igel, Anthony Atala
3D printing is an evolving technology that enables the creation of unique organic and inorganic structures with high precision. In urology, the technology has demonstrated potential uses in both patient and clinician education as well as in clinical practice. The four major techniques used for 3D printing are inkjet printing, extrusion printing, laser sintering, and stereolithography. Each of these techniques can be applied to the production of models for education and surgical planning, prosthetic construction, and tissue bioengineering...
February 6, 2018: Nature Reviews. Urology
Hongki Kang, Gu-Haeng Lee, Hyunjun Jung, Jee Woong Lee, Yoonkey Nam
Localized heat generation by thermo-plasmonic effect of metal nanoparticles has great potential in biomedical engineering research. Precise patterning of the nanoparticles using inkjet printing can enable the application of thermo-plasmonic effect in a well-controlled way (shape and intensity). However, universally applicable inkjet printing process that allows good control in patterning and assembly of nanoparticles with good biocompatibility is missing. Here we developed an inkjet printing based bio-functional thermo-plasmonic interfaces that can modulate biological activities...
February 5, 2018: ACS Nano
Florian Mathies, Philipp Brenner, Gerardo Hernandez-Sosa, Ian A Howard, Ulrich W Paetzold, Uli Lemmer
We report on digitally printed distributed feedback lasers on flexible polyethylene terephthalate substrates based on methylammonium lead iodide perovskite gain material. The perovskite lasers are printed with a digital drop-on-demand inkjet printer, providing full freedom in the shape and design of the gain layer. We show that adjusting the perovskite ink increases the potential processing window and decreases the surface roughness of the active layer to less than 7 nm, which is essential for low lasing thresholds...
January 22, 2018: Optics Express
Serge Mazauric, Mathieu Hébert, Thierry Fournel
We introduce a so-called "mean-path-defined Yule-Nielsen" (MPD-YN) model for predicting the color of halftone prints in reflectance or transmittance modes, inspired by the Yule-Nielsen modified spectral Neugebauer model, where the empirical n value is replaced with a spectral parameter different for each halftone, directly calculated thanks to a closed-form formula, a function of the measured spectral reflectances (or accordingly transmittances) of full-tone calibration patches and the surface coverages of the Neugebauer primaries in the halftone...
February 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Weijia Han, Peilong Hou, Shamaila Sadaf, Helmut Schäfer, Lorenz Walder, Martin Steinhart
Insect-inspired capillary submicron stamping and subsequent surface-limited metal-assisted chemical etching (MACE) with ammonium bifluoride as HF source is employed for high-throughput production of ordered topographically patterned silicon (tpSi). Insect feet often possess hairy contact elements through which adhesive secretion is deployed. Thus, arrays of adhesive secretion drops remain as footprints on contact surfaces. Stamps for insect-inspired capillary submicron stamping having surfaces topographically patterned with contact elements mimic the functional principles of such insect feet...
January 31, 2018: ACS Applied Materials & Interfaces
Hongki Kang, Jee Woong Lee, Yoonkey Nam
Inkjet printing of thermo-plasmonic nanoparticles enables instantaneous, large-area heat pattern generation upon light illumination from distance. By printing multiple metal nanoparticles of different shapes overlaid, we can fabricate multi-wavelength thermo-plasmonic images, which generate different heat patterns from a single printed image depending on the wavelength choice of light. In this work, we propose a novel multi-wavelength thermo-plasmonic image printing that can be used for anti-counterfeit technology...
January 30, 2018: ACS Applied Materials & Interfaces
Raymund E Horch, Annika Weigand, Harald Wajant, Jürgen Groll, Aldo R Boccaccini, Andreas Arkudas
BACKGROUND: The advent of Tissue Engineering (TE) in the early 1990ies was fostered by the increasing need for functional tissue and organ replacement. Classical TE was based on the combination of carrier matrices, cells and growth factors to reconstitute lost or damaged tissue and organs. Despite considerable results in vitro and in experimental settings the lack of early vascularization has hampered its translation into daily clinical practice so far. A new field of research, called "biofabrication" utilizing latest 3D printing technologies aims at hierarchically and spatially incorporating different cells, biomaterials and molecules into a matrix to alleviate a directed maturation of artificial tissue...
January 29, 2018: Handchirurgie, Mikrochirurgie, Plastische Chirurgie
Gayathri Kollamaram, Simon C Hopkins, Bartek A Glowacki, Denise M Croker, Gavin M Walker
Drop-on-demand inkjet printing is a potential enabling technology both for continuous manufacturing of pharmaceuticals and for personalized medicine, but its use is often restricted to low-viscosity solutions and nano-suspensions. In the present study, a robust electromagnetic (valvejet) inkjet technology has been successfully applied to deposit prototype dosage forms from solutions with a wide range of viscosities, and from suspensions with particle sizes exceeding 2 μm. A detailed solid-state study of paracetamol, printed from a solution ink on hydroxypropyl methylcellulose (HPMC), revealed that the morphology of the substrate and its chemical interactions can have a considerable influence on polymorphic selectivity...
January 21, 2018: European Journal of Pharmaceutical Sciences
Ju An Park, Sejeong Yoon, Jimin Kwon, Hesung Now, Young Kwon Kim, Woo-Jong Kim, Joo-Yeon Yoo, Sungjune Jung
A correction to this article has been published and is linked from the HTML version of this paper. The error has been fixed in the paper.
January 23, 2018: Scientific Reports
Tomas Homola, Jan Pospišil, Richard Krumpolec, Pavel Souček, Petr Dzik, Martin Weiter, Mirko Černák
This contribution presents a low-temperature method for dry hydrogen plasma reduction of inkjet-printed flexible graphene oxide (GO) electrodes, an approach compatible with processes envisaged for the manufacture of flexible electronics. The processing of GO to reduced graphene oxide (rGO) was performed in 1-64 seconds, and sp2/sp2+sp3 carbon concentration increased from approx. 20% to 90%. Since the plasma reduction was associated with an etching effect, the optimal reduction time occurred between 8 and 16 seconds...
January 22, 2018: ChemSusChem
Raushan Nurdillayeva, Atsinafe Oshido, Thomas Bamford, Osama El-Zubir, Andrew Houlton, John Hedley, Andrew Pike, Benjamin Horrocks
Cadmium sulfide can be templated on -DNA molecules to form an aqueous dispersion of CdS/-DNA nanowires. Subsequent addition of ethylene glycol to 50% v/v is sufficient to formulate an ink suitable for printing using piezoelectric drop-on-demand technology. Printed droplet arrays show a coffee-ring morphology of individual deposits by fluorescence and Raman microscopy, but upon increasing the number of layers of printed material by repeated printing over each droplet, the dry deposit approaches closer to a disc shape...
January 19, 2018: Nanotechnology
Jonathan C Taylor, Nicholas Vennart, Ian Negus, Robin Holmes, Oliver Bandmann, Christine Lo, John Fenner
The Alderson striatal phantom is frequently used to assess I-FP-CIT (Ioflupane) image quality and to test semi-quantification software. However, its design is associated with a number of limitations, in particular: unrealistic image appearances and inflexibility. A new physical phantom approach is proposed on the basis of subresolution phantom technology. The design incorporates thin slabs of attenuating material generated through additive manufacturing, and paper sheets with radioactive ink patterns printed on their surface, created with a conventional inkjet printer...
January 17, 2018: Nuclear Medicine Communications
Niazul Islam Khan, Alec G Maddaus, Edward Song
Recently, inkjet-printing has gained increased popularity in applications such as flexible electronics and disposable sensors, as well as in wearable sensors because of its multifarious advantages. This work presents a novel, low-cost immobilization technique using inkjet-printing for the development of an aptamer-based biosensor for the detection of lysozyme, an important biomarker in various disease diagnosis. The strong affinity between the carbon nanotube (CNT) and the single-stranded DNA is exploited to immobilize the aptamers onto the working electrode by printing the ink containing the dispersion of CNT-aptamer complex...
January 15, 2018: Biosensors
Ahmed Salim, Sungjoon Lim
Metamaterial elements/arrays exhibit a sensitive response to fluids yet with a small footprint, therefore, they have been an attractive choice to realize various sensing devices when integrated with microfluidic technology. Micro-channels made from inexpensive biocompatible materials avoid any contamination from environment and require only microliter-nanoliter sample for sensing. Simple design, easy fabrication process, light weight prototype, and instant measurements are advantages as compared to conventional (optical, electrochemical and biological) sensing systems...
January 15, 2018: Sensors
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