A study of pin-to-plate type spark discharge generator for producing unagglomerated nanoaerosols

Han, Kyou‐Sup; Kim, Woong-Sik; Yu, Jiwon; Lee, Jeong-Hoon; Lee, Hee Chul; Woo, Chang Gyu; Choi, Mansoo

doi:10.1016/j.jaerosci.2012.05.002

Cited by 47 publications

(33 citation statements)

References 21 publications

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“…Agglomeration can be prevented to some extent by high dilution rates (Schwyn et al 1988;Tabrizi et al 2009). In a recent study, Han et al (2012), it has been shown that a pin-to-plate configuration generates smaller and less agglomerated particles at identical dilution flows. Through initial testing, we observed that a rod opposite to a wire electrode (similar to a pin-to-plate configuration) led to the production of stable concentration of clusters.…”

Section: Sdg Operation For Cluster Generationmentioning

confidence: 99%

Atomic Cluster Generation with an Atmospheric Pressure Spark Discharge Generator

Maisser

Barmpounis

Attoui

et al. 2015

Aerosol Science and Technology

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A new method for generating metal clusters in the gas phase is described and characterized in this work. The method is based on material evaporation by spark ablation at atmospheric pressure. The characterization of atomic clusters was done by measuring their electrical mobility. The measured mobilities were compared with values found in literature in order to identify the cluster species. We show that silver clusters consisting from one up to 25 atoms can be produced in helium at atmospheric pressure. In addition, the effect of oxygen concentration on the resulting cluster mobility distribution was investigated. Results show that at higher oxygen level, the mobility distribution is dominated by the abundance of stable clusters (i.e., magic number clusters). This can be attributed to an oxidation etching effect.

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Section: Sdg Operation For Cluster Generationmentioning

confidence: 99%

Atomic Cluster Generation with an Atmospheric Pressure Spark Discharge Generator

Maisser

Barmpounis

Attoui

et al. 2015

Aerosol Science and Technology

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“…Here, we propose a sustainable and universal approach to textile nanofinishing that relies on a single-step NP synthesis and deposition process. Among the various aerosol processes, electrical discharges allow the high-yield synthesis of a wide range of well-defined NPs [20][21][22][23][24][25] (with respect to NP concentration, size, 26,27 crystallinity, 28 and chemical composition 29,30 ) that can be directly deposited onto textile fibers by diffusion, in a green and universal manner. The uniqueness of the proposed process lies in that diffusional deposition can be easily integrated into textile nanofinishing while providing a controlled loading profile within the textiles.…”

Section: Introductionmentioning

confidence: 99%

Scalable and Environmentally Benign Process for Smart Textile Nanofinishing

Feng

Hontañón

Blanes

et al. 2016

ACS Appl. Mater. Interfaces

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A major challenge in nanotechnology is that of determining how to introduce green and sustainable principles when assembling individual nanoscale elements to create working devices.For instance, textile nanofinishing is restricted by the many constraints of traditional pad-drycure processes, such as the use of costly chemical procedures to produce nanoparticles (NPs), the high liquid and energy consumption, the production of harmful liquid waste, and multi-step batch operations. By integrating low-cost, scalable, and environmentally benign aerosol processes of the type proposed here into textile nanofinishing, these constraints can be circumvented while leading to a new class of fabrics. The proposed one-step textile nanofinishing process relies on the diffusional deposition of aerosol NPs onto textile fibers. As proof of this concept, we deposit Ag NPs onto a range of textiles and assess their antimicrobial properties for two strains of bacteria (i.e., Staphylococcus Aureus and Klebsiella Pneumoniae).The measurements show that the logarithmic reduction in bacterial count reaches ca. 5.5 (corresponding to a reduction efficiency of 99.96%) when the Ag loading is one order of magnitude less (10 ppm; i.e., 10 mg Ag NPs per kg of textile) than in the textiles treated by traditional wet-routes. The antimicrobial activity does not increase in proportion to the Ag content above 10 ppm as a consequence of a "saturation" effect. Such low loading for

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“…The experimental setup comprises an SDG, an electrostatic precipitator, and a scanning mobility particle sizer (SMPS) system with an aerosol neutralizer, which is a commonly used particle measurement setup, as depicted in Figure 1a (Byeon et al 2008;Tabrizi et al 2009;Han et al 2012). The SDG was made of a cylindrical chamber, two electrodes, electrode holders, and an inlet and an outlet for carrier gas flow.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Recently, a pin-to-plate-type spark discharge generator (PP-SDG), having asymmetric electrodes comprising a sharp pin and a plate with a hole, was introduced which generates less agglomerated sub-10-nm nanoparticles with high concentration than the RR-SDG at the same condition (Han et al 2012). This is attributed to the much faster transport of as-generated particles in PP-SDG.…”

Section: Introductionmentioning

confidence: 99%

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Wire-in-Hole-Type Spark Discharge Generator for Long-Time Consistent Generation of Unagglomerated Nanoparticles

Chae

Lee

Kim

et al. 2015

Aerosol Science and Technology

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The electrode configuration in a spark discharge generator plays a critical role in the characteristics of the process. For instance, the rod-to-rod configuration is unable to prevent nanoparticles from agglomerating due to slow local carrier gas velocity. On the other hand, the recently developed pin-to-plate configuration is able to produce unagglomerated nanoparticles; however, the geometric mean diameter and the number concentration of produced nanoparticles change over time as the pin gets eroded. In this work, we present a novel wire-in-holetype spark discharge generator (WH-SDG) which is able to generate unagglomerated nanoparticles with a constant size distribution over a long time. The WH-SDG, which consists of a metal wire and a grounded plate with a hole in which the metal wire is located in the center, effectively suppressed changes in the electrode morphology and the gap distance, which cause the minimal variation of the spark discharge voltage and frequency in time. Therefore, the WH-SDG was able to maintain a constant size distribution of the generated nanoparticles for 12 h. In addition, it was found that the WH-SDG could control the diameter of nanoparticles by regulating the gas flow rate into generator, and could produce nanoparticles from various metals such as copper and palladium.

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A study of pin-to-plate type spark discharge generator for producing unagglomerated nanoaerosols

Cited by 47 publications

References 21 publications

Atomic Cluster Generation with an Atmospheric Pressure Spark Discharge Generator

Atomic Cluster Generation with an Atmospheric Pressure Spark Discharge Generator

Scalable and Environmentally Benign Process for Smart Textile Nanofinishing

Wire-in-Hole-Type Spark Discharge Generator for Long-Time Consistent Generation of Unagglomerated Nanoparticles

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