scholarly journals KAJIAN CYCLIC VOLTAMMETRY PENGARUH SURFAKTAN GLUCOPONE 215 CSUP DALAM ELEKTROLIT SULFAT

2017 ◽  
Vol 1 (1) ◽  
pp. 33
Author(s):  
Setia Budi ◽  
Agung Purwanto ◽  
A.R. Daud
Keyword(s):  
Cyclic Voltammetry ◽  
Critical Micelle Concentration ◽  
Electrochemical Deposition ◽  
Negative Potential ◽  
Cyclic Voltammogram ◽  
Electrochemical Studies ◽  
High Concentration ◽  
Sulphate Electrolyte ◽  
Preliminary Study ◽  
Significant Change

The preliminary study on the use of Glucopone 215 CSUP surfactant as an additive in nanoparticles preparation by means of electrochemical deposition has been investigated. Critical micelle concentration (CMC) of Glucopone 215 CSUP was firstly determined both in de-ionized water and sulphate electrolyte using ensiometer. It was found that the presence of ions of the sulphate electrolyte did not make significant change on the CMC value. Electrochemical studies were then carried out using cyclic voltammetry technique. The influence of the addition of Glucopone 215 CSUP was found beyond its CMC, namely at concentration of 1.3 wt.%. In the presence of high concentration of the surfactant, The increase of current at cathodic scan of the cyclic voltammogram was observed at more negative potential  than  that  of  without  surfactant.  This  result  should  be  very  important  in  providing  suitable  co-electrodeposition potential for nanoparticles of Co, Ni and Cu electrodeposition assisted by glucopone 215 CSUP. Keywords: cyclic voltammetry, critical micelle concentration, Glucopone 215 CSUP, electrodepositionAbstrak Surfaktan  dapat  digunakan  sebagai  aditif  yang  dapat  mengontrol  dan  memodifikasi  proses  pertumbuhan  partikel yang  dipreparasi  dengan  metode  deposisi  elektrokimia.  Kajian  pendahuluan  terhadap  pengaruh  penggunaan surfaktan Glucopone 215 CSUP terhadap karakteristik elektrokimia elektrolit sulfat telah dilakukan menggunakan teknik cyclic voltammetry. Hasil pengukuran menggunakan tensiometer menunjukkan bahwa ion-ion dari elektrolit tidak  menimbulkan  perbedaan  signifikan  terhadap  critical  micelle  concentration  (CMC)  surfaktan  yang  dikaji. Pengaruh penambahan surfaktan Glucopone 215 CSUP terhadap cyclic voltammogram teramati ketika konsentrasi surfaktan  diatas  nilai  CMC-nya.  Katodik  scan  dari  cyclic  voltammogram  menunjukkan  bahwa  pada  konsentrasi diatas  surfaktan,  1,3  wt.%,  titik  kenaikan  arus  katodik  bergeser  ke  potensial  yang  semakin  negatif.  Hasil  ini memberikan informasi potensial co-electrodeposisi yang sesuai untuk Co, Ni, dan Cu yang dipreparasi dari elektrolit sulfat dengan menggunakan aditif Glucopone 215 CSUP.Keywords: cyclic voltammetry, critical micelle concentration, Glucopone 215 CSUP, elektrodeposisi

scholarly journals Electrochemical Study on MgO as an Additive in Molten Li2CO3-Na2CO3 for Molten Carbonate Fuel Cells

2021 ◽  
Author(s):  
Chan Mi Kim ◽  
In Ui Kim ◽  
S. P. Yoon ◽  
Sung Ki Cho
Keyword(s):  
Diffusion Coefficient ◽  
Fuel Cells ◽  
Electrochemical Impedance ◽  
Oxygen Solubility ◽  
Cyclic Voltammograms ◽  
Cyclic Voltammogram ◽  
Molten Carbonate ◽  
High Concentration ◽  
Electrochemical Response ◽  
Molten Carbonate Fuel Cells

Abstract This study investigates the effect of MgO as an additive in molten Li2CO3-Na2CO3 electrolyte for molten carbonate fuel cells through electrochemical analyses. Addition of MgO (1~5 mol%) increased the electrochemical response in cyclic voltammogram of peroxide in molten Li2CO3-Na2CO3. The diffusion coefficient of peroxide in molten Li2CO3-Na2CO3 containing MgO was determined via the comparison between the peak currents of cyclic voltammograms from microwire electrode and macrowire electrode. The addition of MgO did not impact the diffusion coefficient, indicating that the increase in the electrochemical response with the addition of MgO might be attributed to the increase in the peroxide concentration. The change in peroxide concentration was also confirmed by electrochemical impedance analyses, which exhibited a decrease in the exchange current density. The increase in the concentration of peroxide with the addition of MgO might be associated with the high thermal decomposition constant of MgCO3, implying the high concentration of oxide ion in the molten Li2CO3-Na2CO3. This study suggests that MgO might be an effective additive for increasing the oxygen solubility in the molten Li2CO3-Na2CO3, and subsequently for enhancing the performance of molten carbonate fuel cells.

Preliminary Study on the Removal of Hexavalent Chromium in Wastewater with Reduction of Sulfur Dioxide

2013 ◽  
Vol 864-867 ◽  
pp. 1699-1703
Author(s):  
Ji Ming Wu ◽  
Sheng Gao Cheng
Keyword(s):  
Reaction Time ◽  
Sulfur Dioxide ◽  
Hexavalent Chromium ◽  
Reduction Reaction ◽  
High Concentration ◽  
Reaction Conditions ◽  
Ph Values ◽  
Different Temperatures ◽  
Preliminary Study ◽  
High Concentrations

The paper focused on a self-developed methodology through using sulfur dioxide to deal with high concentration of chromium-containing wastewater. It studied the effects of different pH values, different reaction time, different temperatures and different amounts of sulfur with sulfur dioxide reduction reaction on the chromium-containing wastewater. The results showed that: when the reaction conditions were controlled as follows: the pH values ranged from 2 to 4, the reaction temperature was controlled 40~60°C, the amount of sulfur in theoretical was 1.2 times and the reaction time was 40 min, the hexavalent chromium in the high concentrations of chromium-containing wastewater could be effectively removed.

High Quality cDNA synthesis and Amplification of Chalcone Synthase Gene (CHS) from Justicia gendarussa Burm. F.

2013 ◽  
Vol 64 (2) ◽  
Author(s):  
Arman Amani Babadi ◽  
Faezah Mohd Salleh
Keyword(s):  
Chalcone Synthase ◽  
High Concentration ◽  
Cdna Synthesis ◽  
Chalcone Synthase Gene ◽  
Malonyl Coa ◽  
Flavonoid Biosynthetic Pathway ◽  
Ctab Method ◽  
Preliminary Study ◽  
The Rich ◽  
Flavonoid Biosynthesis Pathway

Chalcone synthase (CHS) (EC 2.3.1.74) catalyzes the first committed step of flavonoid biosynthesis pathway. It combines 4-coumaroyl-CoA with three C2 units from malonyl-CoA to produce naringenin chalcone which transforms to various numbers of flavonoids. In this work, we attempt to isolate the CHS gene from Gendarusa, which could serve as a preliminary study to elucidate the CHS gene regulation in the flavonoid biosynthetic pathway of Malaysian medicinal plants generally, and in Justicia gendarussa Burm. F. species specifically. The total RNA was isolated from the mature leaves of Justicia gendarussa Burm. F. using the modified CTAB method. Extracted RNA, treated with RQ1 RNase-free DNasekit and cDNA synthesis in order to prepare the rich template of DNA for PCR by using M-MLV Reverse Transcriptase kit. High concentration of cDNA and A260/280 ratio reversely transcribed cDNAs guarantee the quality and quantity of synthesized cDNA. The CHS gene was amplified using the Phusion DNA Polymeraseand showed the same size of the previously amplified CHS gene from Melastoma, 1100bp.

Microwave Synthesis and Characterization of Nanoscale Lanthanum Cobaltite

2012 ◽  
Vol 476-478 ◽  
pp. 1322-1326
Author(s):  
Xiao Yu Jiang ◽  
Jin Chen ◽  
Wen Zhe Chen
Keyword(s):  
Cyclic Voltammetry ◽  
Steady State ◽  
Microwave Irradiation ◽  
Reaction Order ◽  
Synthesis And Characterization ◽  
Cyclic Voltammogram ◽  
Lanthanum Cobaltite ◽  
Bet Analysis ◽  
Perovskite Type

Nanoscale lanthanum cobaltite with perovskite-type was successfully synthesized by microwave irradiation directly and was characterized by XRD, SEM, XPS and BET analysis. The results show that the size of particle was 18 nm averagely, the surface area to be 31.0 m2 g−1. The electrochemical properties were studied by cyclic voltammetry and steady state polarization. The cyclic voltammogram between 0 and 0.55 V exhibited two pairs of redox peaks prior to the onset of O2 evolution in 1 mol dm−3 KOH. The Tafel slope and the reaction order with respect to concentration of OH− were found to be 60 mV decade−1 and ca. 1, respectively.

Electrochemical Studies on Photoactively Conducting Poly(4-aminoazobenzene) Coating: Electrochromic Property

2013 ◽  
Vol 650 ◽  
pp. 98-102 ◽  
Author(s):  
Hsiu Ying Huang ◽  
Jui Chi Lin ◽  
Jui Ming Yeh ◽  
Yi Chen Chou
Keyword(s):  
Absorption Spectra ◽  
Oxidative Coupling ◽  
Uv Absorption ◽  
Electrochromic Property ◽  
Cyclic Voltammogram ◽  
Electrochemical Studies ◽  
Electrochemical Investigation ◽  
Uv Absorption Spectra ◽  
Photoisomerization Process ◽  
Coupling Polymerization

In this study, we present the first electrochemical investigation on the electrochromic property of poly (4-aminoazobenzene) coating prepared by oxidative coupling polymerization. A UV-vis spectrum was used to monitor the photoisomerization process of the polymer. At the same time, the electrochemical activity of the polymer was explored by cyclic voltammogram (CV) measurement, showing that the intrinsic electroactivity of the aniline structure was maintained in the polymer. Moreover, the electrochromic performance of the polymer was investigated by measuring electrochromic photographs and UV absorption spectra.

Sign in / Sign up

Export Citation Format

Share Document