scholarly journals Effects of different thermal sintering temperatures on pattern resistivity of printed silver ink with multiple particle sizes

AIP Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 115116
Author(s):  
Zhiheng Yu ◽  
Fengli Huang ◽  
Tiancheng Zhang ◽  
Chengli Tang ◽  
Xihua Cui ◽  
...  
Keyword(s):  
Particle Sizes ◽  
Silver Ink ◽  
Thermal Sintering ◽  
Multiple Particle

scholarly journals Polarizability-dependent Sorting of Microparticles Using Continuous-flow Dielectrophoretic Chromatography with a Frequency Modulation Method

2019 ◽  
Author(s):  
Jasper Giesler ◽  
Georg R. Pesch ◽  
Laura Weirauch ◽  
Marc-Peter Schmidt ◽  
Jorg Thöming ◽  
...  
Keyword(s):  
Chromatographic Separation ◽  
Continuous Flow ◽  
Research Field ◽  
Modulation Method ◽  
Particle Sizes ◽  
Frequency Bandwidth ◽  
New Approach ◽  
Particle Properties ◽  
Multiple Particle ◽  
Multiple Trap And Release

The separation of microparticles with respect to different properties such as size and material is a research field of great interest. Dielectrophoresis, a phenomenon which is capable of addressing multiple particle properties at once, can be used to perform a chromatographic separation. However, the selectivity of current dielectrophoretic particle chromatography (DPC) techniques is limited. Here we show a new approach for DPC based on differences in the dielectrophoretic mobilities and the crossover frequencies of polystyrene particles. Both differences are addressed by modulating the frequency of the electric field to generate positive and negative dielectrophoretic movement to achieve multiple trap and release cycles of the particles. A chromatographic separation of different particle sizes revealed a voltage dependency of this method. Additionally, we showed the frequency bandwidth influence on separation using one example. The DPC method developed was tested with model particles but offers possibilities to separate a broad range of plastic and metal microparticles or cells and to overcome currently existing limitations in selectivity.

scholarly journals Potential Risk to Pollinators from Nanotechnology-Based Pesticides

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4458 ◽  
Author(s):  
Louisa A. Hooven ◽  
Priyadarshini Chakrabarti ◽  
Bryan J. Harper ◽  
Ramesh R. Sagili ◽  
Stacey L. Harper
Keyword(s):  
Potential Risk ◽  
Honey Bees ◽  
Environmental Contaminants ◽  
Particle Sizes ◽  
Multiple Factors ◽  
Pesticide Formulations ◽  
Insect Pollinators ◽  
Global Concern ◽  
Structural Adaptations ◽  
Multiple Particle

The decline in populations of insect pollinators is a global concern. While multiple factors are implicated, there is uncertainty surrounding the contribution of certain groups of pesticides to losses in wild and managed bees. Nanotechnology-based pesticides (NBPs) are formulations based on multiple particle sizes and types. By packaging active ingredients in engineered particles, NBPs offer many benefits and novel functions, but may also exhibit different properties in the environment when compared with older pesticide formulations. These new properties raise questions about the environmental disposition and fate of NBPs and their exposure to pollinators. Pollinators such as honey bees have evolved structural adaptations to collect pollen, but also inadvertently gather other types of environmental particles which may accumulate in hive materials. Knowledge of the interaction between pollinators, NBPs, and other types of particles is needed to better understand their exposure to pesticides, and essential for characterizing risk from diverse environmental contaminants. The present review discusses the properties, benefits and types of nanotechnology-based pesticides, the propensity of bees to collect such particles and potential impacts on bee pollinators.

Investigation of Different Sintering Methods on Ink-Jet-Printed Conductive Structures

2016 ◽  
Vol 856 ◽  
pp. 217-223
Author(s):  
Joachim Bahr ◽  
Oleksander Kravchuk ◽  
Marcus Reichenberger
Keyword(s):  
Organic Compounds ◽  
Energy Input ◽  
Raw Materials ◽  
Laser Sintering ◽  
Ink Jet Printing ◽  
Silver Ink ◽  
Ink Jet ◽  
Jet Printing ◽  
Thermal Sintering ◽  
The Individual

Over the last decades ink-jet-printing has developed in many applications. The di-rect writing of materials such as silver (for conductive circuits) or polymers (for insulation or second layer) is an attractive method to reduce costs and save raw materials. For conductor paths silver inks with nanoparticles are used. To ensure a good dispersion the nanoparticles are mostly covered with organic compounds. To guarantee electrical conductivity the organic compounds have to be removed and the particles have to be sintered to minimize resistivity. This is done by heating up the silver structures. In this article we compare different meth- ods of sintering conductive paths printed using a silver ink with a particle size of ≤ 50 nm. The methods of sintering are the established thermal sintering in an oven, and alternatively laser sintering as well as electrical resistive sintering. Laser sintering is carried out with a semiconductor laser with a wavelength of 408 nm and different feeding speeds so the energy input in the structures can be varied. For electrical resistive sintering a DC-current is injected to the structures whereby they are heated up by the current. During electrical sintering the actual value of the resistance of the hot structures can be observed. Thereby the sintering can be stopped, when a certain value (of the hot structure) is reached. The best parameters for both sintering alternatives are identified. The conductivity and the deviation of the conductivity of the sintered paths are determined and compared with the results achieved for thermal sintering. As a result, it can be stated, that both alternatives pro-vide specific advantages over thermal sintering such as lower deviations of the measured values or significantly lower process times. On the other hand, specific limitations might occur when using laser or electrical sintering. Additionally, the individual amount of energy input for the three respective sintering pro-cesses is calculated and compared with each other to determine the most energy efficient sintering method. Also the process of direct contacting electrical devices with ink-jet-printing is compared with the standard process wire bonding related to the consumption of material and energy.

scholarly journals Polarizability-Dependent Sorting of Microparticles Using Continuous-Flow Dielectrophoretic Chromatography with a Frequency Modulation Method

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 38 ◽  
Author(s):  
Jasper Giesler ◽  
Georg R. Pesch ◽  
Laura Weirauch ◽  
Marc-Peter Schmidt ◽  
Jorg Thöming ◽  
...  
Keyword(s):  
Chromatographic Separation ◽  
Continuous Flow ◽  
Research Field ◽  
Modulation Method ◽  
Particle Sizes ◽  
Frequency Bandwidth ◽  
New Approach ◽  
Particle Properties ◽  
Multiple Particle ◽  
Multiple Trap And Release

The separation of microparticles with respect to different properties such as size and material is a research field of great interest. Dielectrophoresis, a phenomenon that is capable of addressing multiple particle properties at once, can be used to perform a chromatographic separation. However, the selectivity of current dielectrophoretic particle chromatography (DPC) techniques is limited. Here, we show a new approach for DPC based on differences in the dielectrophoretic mobilities and the crossover frequencies of polystyrene particles. Both differences are addressed by modulating the frequency of the electric field to generate positive and negative dielectrophoretic movement to achieve multiple trap-and-release cycles of the particles. A chromatographic separation of different particle sizes revealed the voltage dependency of this method. Additionally, we showed the frequency bandwidth influence on separation using one example. The DPC method developed was tested with model particles, but offers possibilities to separate a broad range of plastic and metal microparticles or cells and to overcome currently existing limitations in selectivity.

scholarly journals The effect of multiple particle sizes on cooling rates of chondrules produced in large-scale shocks in the solar nebula

2016 ◽  
Vol 51 (5) ◽  
pp. 870-883 ◽  
Author(s):  
Melissa A. Morris ◽  
Stuart J. Weidenschilling ◽  
Steven J. Desch
Keyword(s):  
Large Scale ◽  
Solar Nebula ◽  
Particle Sizes ◽  
Cooling Rates ◽  
Multiple Particle

scholarly journals Polarizability-dependent Sorting of Microparticles Using Continuous-flow Dielectrophoretic Chromatography with a Frequency Modulation Method

2019 ◽  
Author(s):  
Jasper Giesler ◽  
Georg R. Pesch ◽  
Laura Weirauch ◽  
Marc-Peter Schmidt ◽  
Jorg Thöming ◽  
...  
Keyword(s):  
Chromatographic Separation ◽  
Continuous Flow ◽  
Research Field ◽  
Modulation Method ◽  
Particle Sizes ◽  
Frequency Bandwidth ◽  
New Approach ◽  
Particle Properties ◽  
Multiple Particle ◽  
Multiple Trap And Release

The separation of microparticles with respect to different properties such as size and material is a research field of great interest. Dielectrophoresis, a phenomenon which is capable of addressing multiple particle properties at once, can be used to perform a chromatographic separation. However, the selectivity of current dielectrophoretic particle chromatography (DPC) techniques is limited. Here we show a new approach for DPC based on differences in the dielectrophoretic mobilities and the crossover frequencies of polystyrene particles. Both differences are addressed by modulating the frequency of the electric field to generate positive and negative dielectrophoretic movement to achieve multiple trap and release cycles of the particles. A chromatographic separation of different particle sizes revealed a voltage dependency of this method. Additionally, we showed the frequency bandwidth influence on separation using one example. The DPC method developed was tested with model particles but offers possibilities to separate a broad range of plastic and metal microparticles or cells and to overcome currently existing limitations in selectivity.

Characterization of carbides in M50NiL

1991 ◽  
Vol 49 ◽  
pp. 606-607
Author(s):  
L. S. Lin ◽  
K. P. Gumz ◽  
A. V. Karg ◽  
C. C. Law
Keyword(s):  
Temperature Effects ◽  
Base Composition ◽  
Lattice Parameter ◽  
Control Surface ◽  
Carbide Formation ◽  
Particle Sizes ◽  
Low Carbon ◽  
Fee Structure ◽  
Heat Treated

Carbon and temperature effects on carbide formation in the carburized zone of M50NiL are of great importance because they can be used to control surface properties of bearings. A series of homogeneous alloys (with M50NiL as base composition) containing various levels of carbon in the range of 0.15% to 1.5% (in wt.%) and heat treated at temperatures between 650°C to 1100°C were selected for characterizations. Eleven samples were chosen for carbide characterization and chemical analysis and their identifications are listed in Table 1.Five different carbides consisting of M6C, M2C, M7C3 and M23C6 were found in all eleven samples examined as shown in Table 1. M6C carbides (with least carbon) were found to be the major carbide in low carbon alloys (<0.3% C) and their amounts decreased as the carbon content increased. In sample C (0.3% C), most particles (95%) encountered were M6C carbide with a particle sizes range between 0.05 to 0.25 um. The M6C carbide are enriched in both Mo and Fe and have a fee structure with lattice parameter a=1.105 nm (Figure 1).

TEM study on fine carbide precipitates and dislocation cell structure

1990 ◽  
Vol 48 (4) ◽  
pp. 904-905
Author(s):  
Mengzhe Chen ◽  
Siqin Wang ◽  
Jun Ke
Keyword(s):  
Carbide Particle ◽  
Cell Structure ◽  
Ferrite Matrix ◽  
Dislocation Cell ◽  
Isothermal Treatment ◽  
Particle Sizes ◽  
Dislocation Cell Structure ◽  
Thin Foils ◽  
Hsla Steels ◽  
Fine Carbide

A series of investigations have been conducted into the nature and origin of the dislocation cell structure. R.J.Klassen calculated that the dislocation cell limiting size in pure ferrite matrix is about 0.4 μm. M.N.Bassion estimated the size of dislocation cell in deformed ferrite of HSLA steels to be of the same order.In this paper, TEM observation has been concentrated on the interaction of fine carbide precipitates with dislocation cell structure in deformed Fe-C-V (0.05%C, 0.13% and 0.57%V) and Fe-C-Nb (0.07 %C and 0.04%Nb) alloys and compared with that in Fe-C (0.05%). Specimens were austenitized at 1500 “C/20 min and followed by isothermal treatment at 750 °C and 800 “C for 20, 40 and 120 minutes . The carbide particle sizes in these steels are from 9 to 86nm measured from carbon extraction replicas. Specimens for TEM were cut from differently deformed areas of tensile specimens deformed at room temperture. The thin foils were jet electropolished at -20 C in a solution of 10% perchloric acid and 90% ethanol. The TEM observation was carried out in JEM 100CX , EM420 at 100kv and JEM 2000FX at 200kv.

Sign in / Sign up

Export Citation Format

Share Document