scholarly journals A Study of Nanosilver Colloid Prepared by Electrical Spark Discharge Method and Its Antifungal Control Benefits

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 503
Author(s):  
Kuo-Hsiung Tseng ◽  
Meng-Yun Chung ◽  
Juei-Long Chiu ◽  
Chao-Heng Tseng ◽  
Chao-Yun Liu
Keyword(s):  
Aspergillus Niger ◽  
Aspergillus Flavus ◽  
Microbial Control ◽  
Spark Discharge ◽  
Colloid Solution ◽  
Chemical Additives ◽  
Control Effect ◽  
Standard Solution ◽  
Discharge Method ◽  
Electrical Spark Discharge Method

This is a study of an antimicrobial test, including yeast, Aspergillus Niger, and Aspergillus Flavus, on a nanosilver colloid solution. The antibiosis is compared with a standard silver ion solution at the same concentration as in the experimental process. This study proved that the nanosilver colloid prepared by the electrical spark discharge method (ESDM) is free of any chemical additives, has a microbial control effect, and that the effect is much better than the Ag+ standard solution at the same concentration. 3M Count Plate (YM) is used to test and observe the colony counts. The microbial control test for yeast, Aspergillus Niger, and Aspergillus Flavus is implemented in the nanosilver colloid. In addition to Aspergillus flavus, an Ag+ concentration of 16 ppm is enough to inhibit the growth of the samples. At the same concentration, the nanosilver colloid has a much better microbial control effect than the Ag+ standard solution, which may be because the nanoparticle can release Ag+ continuously, so the solution using the ESDM has a more significant microbial control effect.

Characteristic Analysis and Electrical Conductivity of Graphene and Graphene-Nanosilver Prepared by Electrical Spark Discharge Method

2021 ◽  
Author(s):  
Kuo-Hsiung Tseng ◽  
Chu-Ti Yeh ◽  
Hsueh-Chien Ku ◽  
Der-Chi Tien ◽  
Leszek Stobinski
Keyword(s):  
Sheet Resistance ◽  
Spark Discharge ◽  
High Dispersion ◽  
Raman Signal ◽  
Characteristic Analysis ◽  
Graphene Layers ◽  
Ag Colloid ◽  
Xrd Patterns ◽  
Discharge Method ◽  
Electrical Spark Discharge Method

Abstract This study used an electric discharge machine (EDM) to perform the electrical spark discharge method (ESDM) to prepare a graphene colloid and a graphene-Ag colloid. The characteristic wavelengths of graphene, and graphene-Ag are both 262 nm. They had the properties of high dispersion and are unlikely to aggregate. The XRD patterns of graphene and graphene-Ag are typical carbon diffraction peak angles and crystal orientations. Graphene-Ag in DW can increase the Raman signal intensity of graphene. Regarding the graphene colloid and graphene-Ag colloid, their average sheet resistance values are 0.0329 MΩ/sq and 0.00136 MΩ/sq, respectively. Moreover, when AgNPs composited with graphene layers, the average sheet resistance is only 1/24 that of graphene layers, indicating that graphene-Ag has superior conductivity.

Preparing Cuprous Iodide Nanocolloid by the Electrical Spark Discharge Method

2021 ◽  
Author(s):  
Kuo-Hsiung Tseng ◽  
Wei-Jhih Lin ◽  
Meng-Yun Chung ◽  
Der-Chi Tien ◽  
Leszek Stobinski
Keyword(s):  
Spark Discharge ◽  
Discharge Method ◽  
Electrical Spark Discharge Method

scholarly journals Parameter control and property analysis in the preparation of platinum iodide nanocolloids through the electrical spark discharge method

RSC Advances ◽  
2020 ◽  
Vol 10 (50) ◽  
pp. 30169-30175
Author(s):  
Kuo-Hsiung Tseng ◽  
Zih-Yuan Lin ◽  
Meng-Yun Chung ◽  
Der-Chi Tien ◽  
Leszek Stobinski
Keyword(s):  
Spark Discharge ◽  
Parameter Control ◽  
Property Analysis ◽  
Temperature And Pressure ◽  
Discharge Method ◽  
Electrical Spark Discharge Method

This study employed the electrical spark discharge method to prepare platinum iodide nanocolloids at normal temperature and pressure.

Parameter optimization of nanosilver colloid prepared by electrical spark discharge method using Ziegler-Nichols method

2021 ◽  
Vol 148 ◽  
pp. 109650
Author(s):  
Kuo-Hsiung Tseng ◽  
Meng-Yun Chung ◽  
Chaur-Yang Chang ◽  
Chin-Liang Hsieh ◽  
Yi-Kai Tseng
Keyword(s):  
Parameter Optimization ◽  
Spark Discharge ◽  
Discharge Method ◽  
Electrical Spark Discharge Method

scholarly journals Deriving Optimized PID Parameters of Nano-Ag Colloid Prepared by Electrical Spark Discharge Method

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1091
Author(s):  
Kuo-Hsiung Tseng ◽  
Yur-Shan Lin ◽  
Yun-Chung Lin ◽  
Der-Chi Tien ◽  
Leszek Stobinski
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Electrical Discharge ◽  
Short Circuit ◽  
Spark Discharge ◽  
Chemical Pollution ◽  
Ag Colloid ◽  
Short Circuits ◽  
Discharge Method ◽  
Electrical Spark Discharge Method

Using the electrical spark discharge method, this study prepared a nano-Ag colloid using self-developed, microelectrical discharge machining equipment. Requiring no additional surfactant, the approach in question can be used at the ambient temperature and pressure. Moreover, this novel physical method of preparation produced no chemical pollution. This study conducted an in-depth investigation to establish the following electrical discharge conditions: gap electrical discharge, short circuits, and open circuits. Short circuits affect system lifespan and cause electrode consumption, resulting in large, non-nanoscale particles. Accordingly, in this study, research for and design of a new logic judgment circuit set was used to determine the short-circuit rate. The Ziegler–Nichols proportional–integral–derivative (PID) method was then adopted to find optimal PID values for reducing the ratio between short-circuit and discharge rates of the system. The particle size, zeta potential, and ultraviolet spectrum of the nano-Ag colloid prepared using the aforementioned method were also analyzed with nanoanalysis equipment. Lastly, the characteristics of nanosized particles were analyzed with a transmission electron microscope. This study found that the lowest ratio between short-circuit rates was obtained (1.77%) when PID parameters were such that Kp was 0.96, Ki was 5.760576, and Kd was 0.039996. For the nano-Ag colloid prepared using the aforementioned PID parameters, the particle size was 3.409 nm, zeta potential was approximately −46.8 mV, absorbance was approximately 0.26, and surface plasmon resonance was 390 nm. Therefore, this study demonstrated that reducing the short-circuit rate can substantially enhance the effectiveness of the preparation and produce an optimal nano-Ag colloid.

scholarly journals Novel Preparation of Reduced Graphene Oxide–Silver Complex using an Electrical Spark Discharge Method

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 979 ◽  
Author(s):  
Kuo-Hsiung Tseng ◽  
Hsueh-Chien Ku ◽  
Der-Chi Tien ◽  
Leszek Stobinski
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrical Discharge Machine ◽  
High Energy ◽  
Spark Discharge ◽  
New Approach ◽  
Reduced Graphene ◽  
Discharge Machine ◽  
Discharge Method ◽  
Electrical Spark Discharge Method

This study used an electrical discharge machine (EDM) to perform an electrical spark discharge method (ESDM), which is a new approach for reducing graphene oxide (GO) at normal temperature and pressure, without using chemical substances. A silver (Ag) electrode generates high temperature and high energy during gap discharge. Ag atoms and Ag nanoparticles (AgNP) are suspended in GO, and ionization generates charged Ag+ ions in the Ag plasma with a strong reducing property, thereby carrying O away from GO. A large flake-like structure of GO was simultaneously pyrolyzed to a small flake-like structure of reduced graphene oxide (rGO). When Ag was used as an electrode, GO was reduced to rGO and the exfoliated AgNP surface was coated with rGO, thus forming an rGOAg complex. Consequently, suspensibility and dispersion were enhanced.

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