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Shear Strength of Conductive Adhesive Joints on Rigid and Flexible Substrates Depending on Adhesive Quantity

Abstract

This article deals with the impact of electrically conductive adhesive quantity on the shear strength of joints glued by adhesives “EPO-TEKⓇ H20S” and “MG8331S” on three types of substrates (FR-4, MELINEXⓇST504, DuPont™ PyraluxⓇAC). These joints were made by gluing chip resistors 1206, 0805 and 0603, with two curing profiles for each adhesive. Different thicknesses of stencil and reductions in the size of the hole in stencils were used for this experiment. These differences have an effect on the quantity of conductive adhesives which must be used on the samples. Samples were measured after the curing process by using a shear strength test applied by the device LabTest 3.030. This article presents the effects of different curing profiles, various types of substrates, and different quantities of adhesives on the mechanical strength of the joint.

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Effect of the electrodeposition potential on the magnetic properties of FeCoNi films

Abstract

The effect of electrodeposition potential on the magnetic properties of the FeCoNi films has been reported in this paper. The FeCoNi electrodeposition was carried out from sulfate solution using potentiostatic technique. The obtained FeCoNi films were characterized by X-ray diffractometer (XRD), atomic absorption spectrometer (AAS) and vibrating sample magnetometer (VSM). It has been shown that the electrodeposition potential applied during the synthesis process determines the magnetic characteristics of FeCoNi films. The more negative potential is applied, the higher Ni content is in the FeCoNi alloy. At the same time, Co and Fe showed almost similar trend in which the content decreased with an increase in applied potential. The mean crystallite size of FeCoNi films was ranging from 11 nm to 15 nm. VSM evaluation indicated that the FeCoNi film is a ferromagnetic alloy with magnetic anisotropy. The high saturation magnetization of FeCoNi film was ranging from 86 A·m2/kg to 105 A·m2/kg. The film is a soft magnetic material which was revealed by a very low coercivity value in the range of 1.3 kA/m to 3.7 kA/m. Both the saturation magnetization and coercivity values decreased at a more negative electrodeposition potential.

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The Effect of Landslide on Gas Pipeline

Abstract

The present paper deals with the calculation of stresses on the pipeline system embedded on a flexible substrate which is burdened by a landslide. As well as taking into account the probability of the influences acting on the pipe as wall thickness, and others.

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Screen printed and laminated electrodes for low-cost capacitive level measurement systems

Abstract

The fabrication procedure and characterization of low-cost electrodes for capacitive level sensors realized on a flexible substrate are presented in this paper. The aim was to prepare conductive electrodes by printing of silver and PEDOT:PSS pastes on coated PET foil. Individual interdigital capacitors and a system with embedded microcontroller readout were designed for a comparative study. Individual capacitors in the form of interdigital electrodes (IDT) were designed with different finger width/spacing dimensions from 300/300 μm to 800/800 μm, a finger length 10 mm and 15 mm and an overall length of 100 mm. A demonstrator device featuring an integrated microcontroller, sensing and reference capacitive sensors and a resistive temperature sensor was realized to proof a practical utilization. The microcontroller is used to calculate capacitances of IDT electrodes in terms of charging time proportional to the fluid level. The design with reference capacitor can be directly applied to different fluids with a wide range of conductivities and dielectric constants without recalibration. The printed structures were thermally laminated with covering PET foil. The sensitivity of the fabricated devices was characterized in liquids with different relative permittivity and conductivity (water and oil). The highest measured sensitivity was 0.7 pF/mm and 0.08 pF/mm for water and oil respectively, with resolution down to 0.1 mm.

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Synthesis of single-crystalline Pb(Zr0.52Ti0.48)O3 nanocrystals by hydrothermal method

Abstract

PbZr0.52Ti0.48O3 nanocrystals were synthesized by a hydrothermal method. The effect of NaOH concentration, reaction temperature and time on nucleation and growth of PbZr0.52Ti0.48O3 nanocrystals was investigated. As the 0.05 mol/L PbZr0.52Ti0.48O3 precursors were heated at 200 °C for 21 h with NaOH concentration of 0.5 mol/L, the tetragonal PbZr0.52Ti0.48O3 nanocrystals were formed, and the grain size was more than 20 nm. With increasing the NaOH concentration from 0.5 to 1.5 mol/L, the grain size of PbZr0.52Ti0.48O3 nanocrystals decreased. When the precursors were heated at different temperatures (140 °C to 200 °C) for 21 h with 1.0 mol/L NaOH, single-phase PbZr0.52Ti0.48O3 nanocrystals were obtained at 160 °C to 200 °C. With increasing the reaction temperature from 160 °C to 200 °C, the grains size of PbZr0.52Ti0.48O3 nanocrystals increased from 5 nm to 9 nm. When the precursors were heated at 160 °C in different reaction times from 6 h to 21 h, the evolution from amorphous to crystalline PbZr0.52Ti0.48O3 nanocrystals in correlation with the reaction time was observed. Single crystalline PbZr0.52Ti0.48O3 nanocrystals with narrow size distribution (from 5 nm to 9 nm) were synthesized by controlling the NaOH concentration, reaction temperature and time. The obtained results can find potential application in preparing PbZr0.52Ti0.48O3 thin films on flexible substrates.

Open access
Influence of Dry Cleaning on the Electrical Resistance of Screen Printed Conductors on Textiles

References [1] MeoliD., May-PlumleeT. 2002. Interactive electronic textile development: A review of technologies» Journal of Textile and Apparel Technology and Management. vol.2, p.1-12. [2] Merilampi S., Laine-Ma T., Ruuskanen P. 2009. The characterisation of electrically conductive silver ink patterns on flexible substrates. Microelectronics Reliability. vol.49, p.782-790. [3] Yang Y.L., Chuang M.C., Lou S.L., Wang J. 2010. Thick-film textile-based amperometric sensors and biosensors. Royal Society of Chemistry. vol.135, p.1230-1234. [4

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Properties Of Thin Metal Layers Deposited On Textile Composites By Using The Pvd Method For Textronic Applications

thin layers of different shapes produced on flexible substrates, in Polish Przegląd Elektrotechniczny (Electrical Review) 2014 vol.90, no. 12, Pages 233-236 [24] Lacour S.P., Wagner S., Huang Z., Suo Z.: Stretchable gold conductors on elastomeric substrates, Applied Physics Letters, Volume 82, Issue 15, 14 April 2003, Pages 2404- 2406 [25] Mattmann C., Clemens F., Tröster G.: Sensor for measuring strain in textile, Sensors, Volume 8, Issue 6, June 2008, pp. 3719-3732 [26] Korzeniewska E., Duraj A., Krawczyk A

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Transdermal patches: Design and current approaches to painless drug delivery

Nord . 4 (1992) 123. 92. S. Banerjee, P. Chattopadhyay, A. Ghosh, P. Datta and V. Veer, Aspect of adhesives in transdermal drug delivery systems, Int. J. Adhes. Adhes . 50 (2014) 70–84. 93. A. M. Wokovich, S. Prodduturi, W. H. Doub, A. S. Hussain and L. F. Buhse, Transdermal drug delivery system (TDDS) adhesion as a critical safety, efficacy and quality attribute, Eur. J. Pharm. Biopharm . 64 (2006) 1–8. 94. A. J. Steven-Fountain, A. G. Atkins, G. Jeronimidis, J. F. V. Vincent, D. F. Farrar and R. A. Chivers, The effect of flexible substrates on

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Indoor air pollution and the contribution of biosensors

; 238: p. 71-75. 94. Wan H, Yin H, Lin L, Zeng X,Mason AJ, Miniaturized planar room temperature ionic liquid electrochemical gas sensor for rapid multiple gas pollutants monitoring. Sensors and Actuators B: Chemical, 2018; 255: p. 638-646. 95. Kuberský P, Syrový T, Hamáček A, Nešpůrek S,Syrová L, Towards a fully printed electrochemical NO2 sensor on a flexible substrate using ionic liquid based polymer electrolyte. Sensors and Actuators B: Chemical, 2015; 209: p. 1084-1090. 96. Rao Z, Liu L, Xie J,Zeng Y, Development of a benzene vapour sensor

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Inkjet-printed flexible RFID antenna for UHF RFID transponders

time of a single process. The reason of such a situation is difficult to explain, but in the source literature, nozzle clogging effects caused by agglomeration of nanoparti-cles in conductive inks and heating of substrate are often indicated [ 14 ]. N1 - 5/14/7 µs 77 V → V=30.1 pL; s = 1.9 m/s N11 - 5/14/7 µs 77 V → V=22.2 pL; s = 2.2 m/s N25 - 5/14/7 µs 77 V → V=33.1 pL; s = 1.5 m/s N47 - 7/8/11 µs 77 V → V=39.2 pL; s = 2.2 m/s The designed pattern is transferred effectively on a flexible substrate by the drop-on-demand inkjet printing method only when the

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