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Direct Stereolithographic 3D Printing of Microfluidic Structures on Polymer Substrates for Printed Electronics
摘要： Both stereolithographic printing of microfluidics and inkjet printing of electronics are promising tools for the fabrication of lab-on-a-chip devices. However, the combination of these two technologies has been a challenge so far, as the 3D-printed components usually have to be bonded manually to the substrates functionalized with printed electronics. Here, a surface modification method is demonstrated for enabling the direct stereolithographic printing of microfluidic structures onto a variety of different substrates that are usually employed for printed electronics. The approach makes use of an acrylate-terminated silane that covalently binds substrate and polymer network of the 3D print. The bonding strength is quantified and the compatibility of the concept with printed electrodes in a microfluidic channel is evaluated.
关键词： additive manufacturing,3D printing,printed electronics,microfluidics
更新于2025-09-09 09:28:46
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Structuring of Magnetic Nanoparticle Fluids for Decorative and Functional Printing and Coating
摘要： Printing and coating of magnetic inks is widely used in the field of magnetic barcode labels. Nanoparticle inks have gained increasing interest in the field of printed electronics. Controlling the transport of magnetic nanoparticle fluids by external magnetic fields is nowadays mainly applied in environmental and biomedical research, e.g. in order to transport functionalised magnetic particles for drug delivery, sensing, thermal cancer therapy, or for the extraction of pollutants in waste water cleaning. Application examples of field assisted nanoparticle assembly or fluid control in coating and printing, e.g. for the structural colour generation in photonics, are recently emerging. In this paper, we address the topic of field assisted patterning by the design of a versatile magnetic pattering and structuring platform for field assisted nanoparticle assembly and locally tailored pattern formation in printing and thin film coating. 2D finite element modelling for tailored magnetic field patterning, as well as experimental inkjet printing and coating results for Fe2O3 iron oxide nanoparticles on glass are presented and discussed. The developed print patterning technique is of interest for decorative and functional printing and coating, e.g. for further developments in the application field of smart security tags.
关键词： superparamagnetic nanoparticles,coating,patterning system design,inkjet printing,nanoparticle inks,field assisted patterning
更新于2025-09-09 09:28:46
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[IEEE 2018 15th European Radar Conference (EuRAD) - Madrid, Spain (2018.9.26-2018.9.28)] 2018 15th European Radar Conference (EuRAD) - A 24-GHz Radar with 3d-Printed and Metallized Lightweight Antennas for UAV Applications
摘要： A 24-GHz frequency-modulated continuous-wave (FMCW) radar system and its possible use in airborne vehicles is presented in this paper. The focus of this paper is set on the ultralight antennas and their integration into radar systems for unmanned aerial vehicle (UAV) applications. For this purpose a radiator arrangement was designed and then 3d-printed twice out of plastics with various methods. Different metallization processes were used to establish conductivity afterwards. Particularly, one antenna was plated with a conventional method and one with a new metallization technique, which makes it feasible to cover a non conducting part with silver within seconds. The weight of the antenna is 7-8 times less, than compared to full metal antennas. Subsequently, both antennas were measured, characterized and compared to each other in terms of re?ection loss and beam pattern. It will be shown that the antenna metallized by the new technology can achieve 2-3 dB better results in return loss than the conventionally plated one in the 24-GHz ISM band. Also it will be shown that both prototypes are similar regarding their gain. Moreover, the antennas were mounted onto a radar, located on the UAV and then ?ight tests up to 120 meters have been performed. These results were recorded, processed and evaluated ?nally.
关键词： horn antenna,airborne application,drones,Jet MetalTM,UAV,additive manufacturing,3d-printing,metallization,radar measurements,FMCW radar
更新于2025-09-09 09:28:46
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Characterization of additively manufactured cellular alumina dielectric structures
摘要： Additive manufacturing (AM, also known as 3D printing) can produce novel three-dimensional structures using low-loss dielectric materials. This enables the construction of dielectrics with complex shapes that enable innovative microwave applications such as resonators, filters, and metamaterial lenses. This paper addresses the production and characterization of cellular structures of various designed densities created with a low loss ceramic material, alumina (aluminum oxide), via vat photopolymerization. The permittivity of these printed structures is variable over roughly an octave, with a range of relative permittivites from 1.78 to 3.60, controlled via part geometry.
关键词： electromagnetic metamaterials,dielectric materials,ceramics,printing,design for manufacture
更新于2025-09-09 09:28:46
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Printable Fabrication of a Fully Integrated and Self-Powered Sensor System on Plastic Substrates
摘要： Wearable and portable devices with desirable flexibility, operational safety, and long cruising time, are in urgent demand for applications in wireless communications, multifunctional entertainments, personal healthcare monitoring, etc. Herein, a monolithically integrated self-powered smart sensor system with printed interconnects, printed gas sensor for ethanol and acetone detection, and printable supercapacitors and embedded solar cells as energy sources, is successfully demonstrated in a wearable wristband fashion by utilizing inkjet printing as a proof-of-concept. In such a “wearable wristband”, the harvested solar energy can either directly drive the sensor and power up a light-emitting diode as a warning signal, or can be stored in the supercapacitors in a standby mode, and the energy released from supercapacitors can compensate the intermittency of light illumination. To the best of our knowledge, the demonstration of such a self-powered sensor system integrated onto a single piece of flexible substrate in a printable and additive manner has not previously been reported. Particularly, the printable supercapacitors deliver an areal capacitance of 12.9 mF cm?2 and the printed SnO2 gas sensor shows remarkable detection sensitivity under room temperature. The printable strategies for device fabrication and system integration developed here show great potency for scalable and facile fabrication of a variety of wearable devices.
关键词： wearable and flexible devices,printable supercapacitors,printable gas sensors,monolithically integrated self-powered systems,inkjet printing
更新于2025-09-09 09:28:46
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Nanostructured Free-Form Objects via a Synergy of 3D Printing and Thermal Nanoimprinting
摘要： High-resolution surface patterning has garnered interests as a nonchemical-based surface engineering approach for creating functional surfaces. Applications in consumer products, parts for transportation vehicles, optics, and biomedical technologies demand topographic patterning on 3D net shape objects. Through a hybrid approach, high-resolution surface texture is incorporated onto 3D-printed polymers via direct thermal nanoimprinting process. The synergy of geometry design freedom in 3D printing and the high spatial resolution in nanoimprinting is demonstrated to be a versatile fabrication of high-fidelity surface pattern (from 2 μm to 200 nm resolution) on convex, concave semicylindrical, and hemispherical objects spanning a range of surface curvatures. The novel hybrid fabrication is further extended to achieve a high-resolution curved mold insert for rapid prototyping via injection molding. The versatility of the fabrication strategies reported here not only provides a post-3D printing process that enhances the surface properties of 3D-printed objects but also opens a new pathway to enable future study on the effects of combining microscale and nanoscale surface texture with macroscopic curvature. Both have been known, individually, as an effective approach to tune surface functionalities.
关键词： nanostructured 3D mold insert,nanoinjection molding,nanoimprint lithography,3D printing,curved object
更新于2025-09-09 09:28:46
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Ink-jet printing of a TiO2–10%ZrO2 thin film for oxygen detection using a solution of metal alkoxoacetylacetonates
摘要： A solution of metal alkoxoacetylacetonates in isoamyl alcohol was used as a functional ink for ink-jet printing of TiO2-10%ZrO2 thin nanostructured films. It is shown that the anatase crystal lattice is formed during heat treatment of xerogel thin films in air at a temperature of 500 °C. According to the SEM scanning electron microscopy, the particle size of the resulting films was 10-11 nm. The effect of the number of TiO2-ZrO2 deposited layers on resulting 2D nanomaterial sensitivity to oxygen and other analyte gases (H2, CH4 and CO) at temperatures of 400 and 450 °C is shown.
关键词： Gas sensor,Sol-gel,Titanium dioxide,Additive,Ink-jet printing,Alkoxoacetylacetonate
更新于2025-09-09 09:28:46
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Disubstituted Aminoanthraquinone-Based Photoinitiators for Free Radical Polymerization and Fast 3D Printing under Visible Light
摘要： The development of highly efficient and rapid photoinitiating systems for free radical photopolymerization under the irradiation of visible light has attracted increasing attention due to their widespread potential applications in, for example, 3D printing or dental polymers. Unfortunately, currently available visible-light-sensitive photoinitiators are not efficient enough for 3D printing applications suffering from low printing speeds. Here we describe a series of photoinitiating systems consisting of disubstituted amino-anthraquinone derivatives (i.e., 1-amino-4-hydroxy-anthraquinone, 1,4-diaminoanthraquinone, and 1,5-diamino-anthraquinone) and various additives (e.g., tertiary amine and phenacyl bromide) toward the free radical photopolymerization of various acrylate monomers (such as commercial 3D resin) under the irradiation of blue to red LEDs. It is shown that the type and position of substituents of the aminoanthraquinone derivative can significantly affect its photoinitiation properties. The most efficient disubstituted aminoanthraquinone derivative-based photoinitiating system was selected and used for the 3D printing of a commercial 3D resin in a 3D printer with polychromatic visible light as the irradiation source. It is shown that its printing speed was dramatically enhanced compared to a commercial photoinitiator 2,4,6-trimethylbenzoyldiphenylphosphine oxide (TPO).
关键词： aminoanthraquinone derivatives,free radical photopolymerization,photoinitiating systems,visible light,3D printing
更新于2025-09-09 09:28:46
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Mixed reality holograms for heart surgery planning: first user experience in congenital heart disease
摘要： Proof of concept and feasibility study for preoperative diagnostic use of mixed reality (MR) holograms of individual 3D heart models from standard cardiac computed tomography angiograms (CTA) images. Optimal repair for complex congenital heart disease poses high demands on 3D anatomical imagination. Three-dimensional printed heart models are increasingly used for improved morphological understanding during surgical and interventional planning. Holograms are a dynamic and interactive alternative, probably with wider applications.
关键词： computed tomography,hologram,structural heart disease,3D printing,mixed reality,three dimensional
更新于2025-09-09 09:28:46
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Investigation of Additive Manufacturing for Broadband Choked Horns at X/Ku Band
摘要： Additive manufacturing is becoming a popular alternative to traditional manufacturing techniques as it has reached a suitable maturity and accuracy for microwave applications. The main advantage is that the manufacturing can be performed directly from the three-dimensional CAD model, available from the numerical simulation of the antenna, without significant modifications. This is a highly desirable feature, in particular for time and cost critical applications such as prototyping and manufacturing of small quantities of antennas. In this letter, we investigate accuracy and repeatability of selective laser melting manufacturing of fully metallic broadband chocked horns at X/Ku band. A complete batch of 15 antennas has been manufactured and validated in terms of matching, radiation efficiency, and volumetric radiation patterns throughout their operating bandwidth. Manufacturing accuracy and repeatability have been evaluated using RF parameters as performance indicators, comparing measured data and high-accuracy simulations. These indicators are compared to state-of-the-art values commonly found for traditional manufacturing. The radiation patterns have been correlated to the numerical reference using equivalent noise level as a performance indicator. For input matching, manufacturing repeatability has been quantified by defining an interference level.
关键词： horn antennas,manufacturing processes,laser sintering,Antenna measurements,three-dimensional (3-D) printing
更新于2025-09-09 09:28:46