scholarly journals Avaliação da limpeza de CDtrodo construídos a partir de CD de ouro gravável/fita adesiva de galvanoplastia

2018 ◽  
Vol 34 (2) ◽  
pp. 59
Author(s):  
Marcos Vinicius Foguel ◽  
Carolina Venturini Uliana ◽  
Paulo Roberto Ussoni Tomaz ◽  
Paulo Roberto Brasil De Oliveira Marques ◽  
Hideko Yamanaka ◽  
...  
Keyword(s):  
Electrode Material ◽  
High Purity ◽  
Low Cost ◽  
Gold Surface ◽  
Surface Cleaning ◽  
H2so4 Solution ◽  
Electroanalytical Chemistry ◽  
Electrode Area ◽  
Ultrasound Application ◽  
Protection Layer

Gold electrodes are widely used in electrochemistry and electroanalytical chemistry, due to the high purity, broad range of work potential as well as the possibility to control and modify the surface. On this work construction and cleaning of electrodes from gold recordables compact discs (CD-Rs), namely CDtrodes, are described. The CDs was submitted to the action of concentrated HNO3 in order to remove the protection layer and to expose the metallic layer; the electrode area was delimited by using galvanoplasty tape. The literature has been published many articles on CDtrode focused on the application but not on the cleaning; there is no register on galvanoplasty tape to define electrode area. Several methods for gold surface cleaning after attack of HNO3 were investigated, such as application of fixed potential in NaClsolution, successive scans in H2SO4 and ultrasound application, and best results were obtained in H2SO4 solution. This electrode material is interesting due to the performance comparable to the commercial electrodes, besides great versatility and low cost.

Static Electroplating of Iron Triad on Fastener Washers

2021 ◽  
Vol 879 ◽  
pp. 275-283
Author(s):  
Koay Mei Hyie ◽  
Salina Budin ◽  
Normariah Che Maideen ◽  
Yudi Rahmawan
Keyword(s):  
Carbon Steel ◽  
Low Cost ◽  
Sem Analysis ◽  
Nickel Iron ◽  
Cobalt Nickel ◽  
Protection Layer ◽  
And Performance ◽  
Resistant Layer ◽  
Corrosion Protection Coating ◽  
Protection Coating

Fasteners are commonly used in construction industry for parts joining purpose. There are many types of construction fasteners such as stud, bolt, anchor, nut, screw, and washer. The major problem of the fastener made by carbon steel is the poor resistance to corrosion. Electroplating is a simple yet low-cost tool to give a strong corrosion protection coating layer on the carbon steel. This study was performed to investigate the effect of current and deposition time on the iron triad (cobalt-nickel-iron) electroplating on the fastener washer. The experiment was conducted at 50 °C, pH 1-3 and at different electroplating time (30 minutes to 90 minutes) and current (0.2 A to 0.5 A). Burnt-out surface coating was observed on the fastener washer when the current was more than 0.4 A. A field test was carried out for 60 days to observe the corrosion behavior and performance of the products. Scanning electron microscope (SEM) analysis showed that a thin protection layer with 5.64 µm was formed at 60 minutes of electroplating time and 0.4 A of current. The surface roughness of the fastener washer was increased by increasing the electroplating time and current. The hardness was also improved with higher current and electroplating time if compared to the original fastener washer. The result of this study confirmed that a strong adhesive corrosion resistant layer to the fastener washer was using the current of 0.4 A (77 mA/cm2) and the electroplating time of 60 minutes.

Constructing oxygen vacancy-enriched Fe2O3@NiO heterojunctions for highly efficient electrocatalytic alkaline water splitting

CrystEngComm ◽  
2021 ◽  
Author(s):  
Yan Sang ◽  
Xi Cao ◽  
Gaofei Ding ◽  
Zixuan Guo ◽  
Yingying Xue ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
High Purity ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Low Cost ◽  
Dual Function ◽  
Alkaline Water ◽  
High Purity Hydrogen

Electrolysis of water to produce high-purity hydrogen is a very promising method. The development of green, high-efficiency, long-lasting and low-cost dual function electrocatalysts for oxygen evolution reaction (OER) and hydrogen...

A low cost, low energy, environmentally friendly process for producing high-purity boron carbide

2019 ◽  
Vol 45 (3) ◽  
pp. 3101-3110 ◽  
Author(s):  
Shuaibo Gao ◽  
Xin Li ◽  
Shuai Wang ◽  
Pengfei Xing ◽  
Jian kong ◽  
...  
Keyword(s):  
Boron Carbide ◽  
High Purity ◽  
Low Cost ◽  
Environmentally Friendly ◽  
Low Energy ◽  
Environmentally Friendly Process

scholarly journals Performance of graphite felt as a cathode and anode in the electro-Fenton process

RSC Advances ◽  
2019 ◽  
Vol 9 (66) ◽  
pp. 38345-38354 ◽  
Author(s):  
Junfeng Li ◽  
Dongbao Song ◽  
Keqing Du ◽  
Zhaoyang Wang ◽  
Chun Zhao
Keyword(s):  
Electrode Material ◽  
Low Cost ◽  
Fenton Process ◽  
Practical Application ◽  
Graphite Felt

Choosing an electrode material with good performance and low cost is of great significance for the practical application of the electro-Fenton process.

Improved Piezoelectric Performance of Electrospun PVDF Nanofibers with Conductive Paint Coated Electrode

2019 ◽  
Vol 19 (02) ◽  
pp. 1950008 ◽  
Author(s):  
R. Tamil Selvan ◽  
W. A. D. M. Jayathilaka ◽  
A. Hilaal ◽  
S. Ramakrishna
Keyword(s):  
Contact Area ◽  
Electrode Material ◽  
Polyvinylidene Fluoride ◽  
Electrode Materials ◽  
Low Cost ◽  
Short Circuit ◽  
Open Circuit ◽  
Energy Output ◽  
Piezoelectric Performance ◽  
Conductive Paint

Fabrication of Nanogenerators (NGs) using Electrospun polyvinylidene fluoride (PVDF) nanofibers for sensing and energy harvesting applications is a trending research due to its flexibility, biocompatibility, low-cost, etc. Different electrode materials, polymer composites had been proposed to increase the energy output. However, the contact area between the electrode material and nanofiber mat which helps to conduct more piezoelectric charges to the electrode surface are still unexplored especially at nanoscale level. In this paper, authors have proposed the use of low-cost carbon conductive paint to increase the contact area between the electrode and nanofiber mat. The electrode material is coated with conductive paint and the NG was fabricated with that electrode to compare the performances with conventional NG. Piezoelectric performance of the proposed NG has increased substantially as it generates an open circuit voltage [Formula: see text]) of 4.5[Formula: see text]V and short circuit current [Formula: see text]) of 25[Formula: see text]nA, whereas the conventional NG can only produce 1.6 [Formula: see text]) and 1.5[Formula: see text]nA [Formula: see text]). A drop test experiment was conducted, and the device consistency was verified experimentally.

scholarly journals A Facile and Low-Cost Method to Produce Ultrapure 99.99999% Gallium

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2308 ◽  
Author(s):  
Kefeng Pan ◽  
Ying Li ◽  
Jiawei Zhang ◽  
Qing Zhao
Keyword(s):  
Liquid Phase ◽  
High Purity ◽  
Raw Materials ◽  
Low Cost ◽  
Crystallization Rate ◽  
Segregation Coefficient ◽  
Crystal Direction ◽  
Partial Recrystallization ◽  
Removal Ratio ◽  
Critical Raw Materials

As one of the critical raw materials, very pure gallium is important for the semiconductor and photoelectric industry. Unfortunately, refining gallium to obtain a purity that exceeds 99.99999% is very difficult. In this paper, a new, facile and efficient continuous partial recrystallization method to prepare gallium of high purity is investigated. Impurity concentrations, segregation coefficients, and the purification effect were measured. The results indicated that the contaminating elements accumulated in the liquid phase along the crystal direction. The order of the removal ratio was Cu > Mg > Pb > Cr > Zn > Fe. This corresponded to the order of the experimentally obtained segregation coefficients for each impurity: Cu < Mg < Pb < Cr < Zn < Fe. The segregation coefficient of the impurities depended strongly on the crystallization rate. All observed impurity concentrations were substantially reduced, and the purity of the gallium obtained after our refinement exceeded 99.99999%.

scholarly journals Facile and low-cost synthesis of pure hematite (α-Fe2O3) nanoparticles from naturally occurring laterites and their superior adsorption capability towards acid-dyes

RSC Advances ◽  
2019 ◽  
Vol 9 (37) ◽  
pp. 21249-21257 ◽  
Author(s):  
D. M. S. N. Dissanayake ◽  
M. M. M. G. P. G. Mantilaka ◽  
T. C. Palihawadana ◽  
G. T. D. Chandrakumara ◽  
R. T. De Silva ◽  
...  
Keyword(s):  
High Purity ◽  
Low Cost ◽  
Effluent Treatment ◽  
Fe2o3 Nanoparticles ◽  
Acid Dyes ◽  
Hematite Nanoparticles ◽  
Naturally Occurring ◽  
Adsorption Capability

High purity hematite nanoparticles have been synthesized by a facile method using naturally occurring laterites for industrial dye effluent treatment applications.

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