TY - CHAP A1 - Heinrich, Moritz A1 - Jacobs, Hannes A1 - Di Vona, Maria Luisa A1 - Pizzoferrato, Roberto A1 - Foitzik, Andreas T1 - A Test System for Safely Measurements of Cancer-Inducing UV-C Diodes Produced in a Simple and Cost-Effective Way by Rapid Prototyping T2 - Open Conference Proceedings N2 - New technologies leading to better and more efficient light emitting diodes. The emitted radiation reaches higher energy levels and lower wavelengths especially in the UV-C spectrum. UV-C light has a cancer inducing effect on human cells. Therefore it is necessary to work in a safe way with those devices. This work is focused on an open-source solution for rapid 3D printing of an safe UV-C radiation measuring device. Especially for research groups or universities which can not afford big safety labs. After modeling and printing the prototype, a series of tests has shown the functionality of that UV-C Diode test system. By using black printing filaments and infill rates over 50 %, the transmission of light could be prevented and the system worked well. KW - 3D printing KW - rapid prototyping KW - UV C LED KW - secure measurement KW - validate LED KW - UV-C KW - radiation mesaurement Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-17682 VL - 2 SP - 197 EP - 199 PB - TIB Open Publishing ER - TY - CHAP A1 - Döhler, Torsten A1 - Böhme, Andrea A1 - Hofmann, Mandy A1 - Neumann, Jens A1 - Bochem, Reinhard A1 - Foitzik, Andreas A1 - Geißler, Ute T1 - Mikrogalvanische Kennzeichnung als Kopierschutz T1 - Electroplated Micro-Labelling as Copy Protection T2 - Open Conference Proceedings N2 - In order to achieve good product quality in electroplating, disturbance variables such as the "dog bone" effect must be avoided. In this work, this approach was used to develop a method for marking as product protection. With a defined structure and optimal parameters, it is possible to deposit unique visually non-differentiable layers on suitable substrates. The deposited layers and their local distribution were characterized by confocal laser microscopy, X-ray fluorescence analysis and laser interference measurements and analyzed qualitatively as well as quantitatively. It thus provides interested parties with an essentially traditional process that can lead to new innovations with the chosen approach. N2 - Um eine gute Produktqualität in der Galvanik zu erreichen, müssen Störgrößen wie zum Beispiel der "Hundeknochen"-Effekt vermieden werden. In dieser Arbeit wurde dieser Ansatz genutzt, um eine Methode zur Kennzeichnung als Produktschutz zu entwickeln. Mit definiertem Aufbau und optimalen Parametern ist es möglich, auf geeigneten Substraten, unikale visuell nicht differenzierbare Schichten abzuscheiden. Die abgeschiedenen Schichten und deren lokale Verteilung wurden mit Hilfe konfokaler Lasermikroskopie, Röntgenfluores-zenzanalyse und Laserinterferenzmessungen charakterisiert und qualitativ als auch quantitativ analysiert. Interessenten stellt es damit ein im Grunde traditionelles Verfahren zur Verfügung, das mit dem gewählten Ansatz zu neuen Innovationen führen kann. Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-17624 VL - 2 SP - 157 EP - 161 PB - TIB Open Publishing ER - TY - JOUR A1 - Böhme, Andrea A1 - Döhler, Torsten A1 - Hofmann, Mandy A1 - Neumann, Jens A1 - Bochem, Reinhard A1 - Geißler, Ute A1 - Foitzik, Andreas T1 - Electrolytical Coating of Inhomogeneous Structures Distributed on Metallic Surfaces JF - Materials Science Forum N2 - In modern electrochemical coating technology, it is common practice to create uniform layers. However, this study focuses on the deposition of non-uniform layers achieved through a deliberate arrangement of micro structured electrodes on the anode side. The "dog bone effect” was employed as the primary approach [1]. When electroplating on an otherwise uniform surface, this effect selectively processes an area influenced by the geometric edge effect (figure 1 left). The coating within this area is intended to be (i) unevenly distributed and (ii) non-reproducible. Process data was obtained through electrochemical simulations and subsequently applied to a specially designed micro-galvanic setup. This enabled the production of suitable micro structured anodes, validation of coating parameters, and the deposition of visually imperceptible structured areas with inhomogeneous properties using "adhesive gold" on appropriate substrates such as silver and nickel. The layers and their local topography were characterized and analyzed using confocal laser microscopy, X-Ray fluorescence analysis (XRF), as well as a self-designed and constructed laser interference device. As a result, this specific galvanic process technology successfully produced metallic layers that (i) cannot be visually confirmed by the naked eye, (ii) exhibit varied microstructural anode geometries, (iii) display unique differences in layer thickness, (iv) possess non-reproducible and chaotic topographies, and (v) can be detected and identified using conventional analysis techniques or a simple interference setup. KW - cathode KW - anode KW - micro-galvanic corrosion KW - electrochemical KW - interferometric KW - sub microstructure KW - dog bone effect Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-18825 SN - 0255-5476 SN - 1662-9752 VL - 1106 SP - 75 EP - 80 PB - Trans Tech Publications ER - TY - CHAP A1 - Friedo, Maria Helene A1 - Hauschultz, Mike Thomas A1 - Döhler, Torsten A1 - Böhme, Andrea A1 - Richetta, Maria A1 - Foitzik, Andreas ED - Stolzenburg, Frieder ED - Reinboth, Christian ED - Lohr, Thomas ED - Vogel, Kathleen T1 - Sustainable production of injection moulds through additive manufacturing and improved application of energy management T2 - NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz N2 - The concept of this thesis is to optimize the manufacturing process of injection moulding tools by using additive manufacturing and thus contribute to environmental protection. For this purpose, the individual steps of the traditional manufacturing process are identified and analysed to determine which steps can be replaced by additive manufacturing. The first step is to clarify which mould components can benefit from additive manufacturing. In particular, the capabilities and limitations of additive manufacturing technologies must be considered. Furthermore, another focus is on how to optimize the cooling and temperature control of the tools. Potential savings through the use of lightweight or insulating surfaces will be examined. In addition to the technical feasibility, the cost-effectiveness of the concept will also be considered. Finally, the contribution of the concept to the reduction of the environmental impact will be evaluated. In particular, energy savings and the reduction of CO2 emissions are taken into account. The potential to optimize the injection mould manufacturing process and reduce environmental impact is significant. Using additive manufacturing can be an economic and environmental advantage. Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-18600 UR - https://www.hs-harz.de/nwk2023/tagungsband-nwk-2023 UR - https://www.hs-harz.de/dokumente/extern/Forschung/NWK2023/Beitraege/Sustainable_production_of_injection_moulds_through_additive_manufacturing_and_improved_application_of_energy_management.pdf SN - 2627-5708 SP - 298 EP - 302 PB - Hochschule Harz CY - Wernigerode ER - TY - CHAP A1 - Welzel, Felix A1 - Hauschultz, Mike Thomas A1 - Krumnow, Erik A1 - Foitzik, Andreas A1 - Richetta, Maria ED - Stolzenburg, Frieder ED - Reinboth, Christian ED - Lohr, Thomas ED - Vogel, Kathleen T1 - Concept and simulation of micromixers and aliquoting for PCR systems T2 - NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz N2 - In this paper, different concepts for mixing sample and master mix by means of simulation are discussed. The main focus was on mixers with a low dead volume, because of their relevance to PCR. In addition, a concept for aliquoting the mixed solution was elaborated and simulated. The simulation showed very good mixing with serpentineand tesla-mixers at flow rates of 1-16 µL/s. Furthermore, a uniform distribution with aliquoting could be achieved, while a slight dependence between flow rate and pressure was observed. In the further course, these concepts are to be combined and tested on a microfluidic chip. This can then be integrated into the workflow of existing PCR protocols. Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-18611 UR - https://www.hs-harz.de/nwk2023/tagungsband-nwk-2023 UR - https://www.hs-harz.de/dokumente/extern/Forschung/NWK2023/Beitraege/Concept_and_simulation_of_micromixers_and_aliquoting_for_PCR_systems.pdf SN - 2627-5708 SP - 303 EP - 306 PB - Hochschule Harz CY - Wernigerode ER - TY - CHAP A1 - Welzel, Felix A1 - Hauschultz, Mike Thomas A1 - Friedo, Maria Helene A1 - Just, Verena A1 - Richetta, Maria A1 - Foitzik, Andreas T1 - Concept for a Portable Measuring Device for the Quantitative Detection of Legionella T2 - Open Conference Proceedings N2 - According to the drinking water regulation, drinking water systems must be tested for harmful contamination at specified intervals. To meet the legal requirements and save costs and time, a portable analysis method is to be developed. For this purpose, a concept study was conducted. It describes a portable measuring device for the quantitative detection of legionella using real-time PCR. The study includes the construction elements and conditions that are necessary for the collection, processing, and evaluation of the sample. It was found that commercially available PCR systems do not meet the size requirements and can only be represented by an in-house development. In addition, a microfluidic system must be developed that is designed for one-time use and low production cost. Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-17616 VL - 2 SP - 15 EP - 17 PB - TIB Open Publishing ER - TY - CHAP A1 - Strauch, Jessica A1 - Wellmann, Martin A1 - Friedo, Maria Helene A1 - Welzel, Felix A1 - Foitzik, Andreas T1 - Miniaturisierung einer Smartwatch für Hautfeuchtesensorik T1 - Miniaturisation of a smartwatch for skin moisture sensing T2 - Open Conference Proceedings N2 - Das Ziel des Projekts ist, den Zustand der Haut von Neurodermitis-Patienten bei verschiedenen Bedingungen und Belastungszuständen erfassen zu können. Dazu wurde ein Prototyp gefertigt, in den ein Mikrosensor zur Bestimmung der Umgebungsfeuchtigkeit, ein Controller mit Bluetooth zur Datenübertragung, sowie ein Lithium-Akku zur Energieversorgung verbaut wurden. N2 - The aim of the project is to be able to record the condition of the skin of neurodermatitis patients under different conditions and stress states. For this purpose, a prototype was manufactured in which a microsensor for determining the ambient humidity, a controller with Bluetooth for data transmission, and a lithium battery for power supply were integrated. Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-17653 VL - 2 SP - 193 EP - 195 PB - TIB Open Publishing ER - TY - CHAP A1 - Hauschultz, Mike Thomas A1 - Friedo, Maria Helene A1 - Döhler, Torsten A1 - Böhme, Andrea A1 - Richetta, Maria A1 - Foitzik, Andreas ED - Stolzenburg, Frieder ED - Reinboth, Christian ED - Lohr, Thomas ED - Vogel, Kathleen T1 - Additive Manufacturing of Electrodes: Innovative Applications and Opportunities T2 - NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz N2 - Additive manufacturing, also known as 3D printing, has gained tremendous importance in recent years. One of the areas where additive manufacturing is particularly useful is in the fabrication of electrodes. Electrodes are an important component of a wide range of applications, including electrochemistry, biomedical engineering, energy storage, analytics, electronics as well as life sciences. Traditionally, electrodes have been manufactured through costly processes such as etching, electroplating or cutting and milling. Additive manufacturing offers a new way to fabricate electrodes by depositing materials layer by layer (Yap et al., 2015). This opens up new possibilities for designing electrodes with complex geometries and structures that would not be possible using conventional methods. As a result, 3D printed electrodes are gaining interest in fields such as electromobility, water disinfection, manufacturing, and life sciences, which will be presented in this paper. Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-18621 UR - https://www.hs-harz.de/nwk2023/tagungsband-nwk-2023 UR - https://www.hs-harz.de/dokumente/extern/Forschung/NWK2023/Beitraege/Additive_Manufacturing_of_Electrodes_-_Innovative_Applications_and_Opportunities.pdf SN - 2627-5708 SP - 292 EP - 297 PB - Hochschule Harz CY - Wernigerode ER -