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Article
Publication date: 1 March 1981

D.A. Luke

Until recently the majority of catalysts used in through‐hole plating of printed circuits have been based on processes containing tin and palladium. These have been…

Abstract

Until recently the majority of catalysts used in through‐hole plating of printed circuits have been based on processes containing tin and palladium. These have been adequate although, with the ever increasing demands on quality of subsequently assembled printed circuits, they have shortcomings which are functions of the basic formulae and mechanisms of operation. The new non‐precious metal catalyst based on copper operates over a much wider range of conditions and, unlike palladium catalysts, promotes complete coverage of epoxy glass laminates. The operation of both catalyst systems is discussed in depth and compared, significant emphasis being placed on the mechanism of surface activation.

Details

Circuit World, vol. 7 no. 4
Type: Research Article
ISSN: 0305-6120

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Article
Publication date: 6 March 2017

Behnam Seyyedi

The paper introduces a microwave and electrochemical-assisted method for synthesis of chlorine-derived iron phthalocyanine pigment and oxygen reduction reaction catalyst

Abstract

Purpose

The paper introduces a microwave and electrochemical-assisted method for synthesis of chlorine-derived iron phthalocyanine pigment and oxygen reduction reaction catalyst nanoparticles. The aims of this study are to investigate the possibility of nano-scale particle size (<35 nm), high-efficiency product reaction, remove acidic wastewater, time optimization and maximize number of chlorine on aromatic rings.

Design/methodology/approach

The paper presents a combined synthesis technique, which does not have the problems of the conventional methods. Chlorinated iron phthalocyanine nanoparticles have been fabricated using phthalic anhydride, urea (high purity), electrochemical-generated iron (II) cations and microwave irradiation as promoter. The approach yields a product of high quality, uniform particle size distribution and high efficiency and that was environment-friendly.

Findings

The particle size and time needed for the production of chlorinated iron phthalocyanine were about 35 nm and 7 min, respectively.

Research limitations/implications

The catalyst, that is used in this method, should be weighed carefully. In addition, the solvent should be a saturated solution of NaCl in water.

Practical implications

The method provides a simple and practical solution to improving the synthesis of an iron-based catalyst for oxygen reduction reaction.

Originality/value

The combined method for synthesis of chlorinated iron phthalocyanine was novel and can find numerous applications in the industry, especially as an oxygen reduction reaction non-precious metal catalyst.

Details

Pigment & Resin Technology, vol. 46 no. 2
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 3 July 2017

Behnam Seyyedi

The purpose of this paper is to introduce bio-inspired FeN4-S-C black nano-electrocatalyst for the oxygen reduction reaction (ORR) in an alkaline medium. The FeN4-S-C…

Abstract

Purpose

The purpose of this paper is to introduce bio-inspired FeN4-S-C black nano-electrocatalyst for the oxygen reduction reaction (ORR) in an alkaline medium. The FeN4-S-C derived without pyrolysis of precursors in high temperature is recognized as a new electrocatalyst for the ORR in an alkaline electrolyte. For the proper design of bio-inspired nano-electrocatalyst for the ORR performance, chlorinated iron (II) phthalocyanine nanoparticles were used as templates for achieving the active sites in aqueous KOH by rotating disk electrode methods. The most active FeN4-S-C catalyst exhibited a remarkable ORR activity in the alkaline medium. The objectives of this paper are to investigate the possibility of nanoscale particles size (˜5nm) of electrocatalyst, to achieve four-electron transfer mechanism and to exhibit much superior catalytic stability in measurements. This paper will shed light on bio-inspired FeN4-S-C materials for the ORR catalysis in alkaline fuel cells.

Design/methodology/approach

The paper presents a new bio-inspired nano-electrocatalyst for the ORR, which has activity nearby platinum/carbon electrocatalyst. Chlorinated iron phthalocyanine nanoparticles have been used as FeN4 template, which is the key point for the ORR. Bio-inspired nano-electrocatalyst has been fabricated using chlorinated iron phthalocyanine, sodium sulphide and carbon black.

Findings

The particles’ size was 5 nm and electron transfer number was 4.

Research limitations/implications

The catalyst that is used in this method should be weighed carefully. In addition, the solvent should be a saturated solution of NaCl in water.

Practical implications

The method provides a simple and practical solution to improving the synthesis of iron-based catalyst for ORR.

Originality/value

The method for the synthesis of bio-inspired electrocatalyst was novel and can find numerous applications in industries, especially as ORR non-precious metal catalyst.

Details

Pigment & Resin Technology, vol. 46 no. 4
Type: Research Article
ISSN: 0369-9420

Keywords

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Article
Publication date: 1 March 1981

The 7th Annual Symposium of the Institute was held this year on Wednesday and Thursday, the 6th and 7th of May to avoid clashing with the Second Printed Circuit World…

Abstract

The 7th Annual Symposium of the Institute was held this year on Wednesday and Thursday, the 6th and 7th of May to avoid clashing with the Second Printed Circuit World Convention scheduled to be held in Munich during June.

Details

Circuit World, vol. 7 no. 4
Type: Research Article
ISSN: 0305-6120

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Article
Publication date: 1 February 1981

The following is a list of examination results obtained at the various courses run by the Institute during 1980. The grading are D = Distinction; C = Credit; P = Pass. The…

Abstract

The following is a list of examination results obtained at the various courses run by the Institute during 1980. The grading are D = Distinction; C = Credit; P = Pass. The prize winner's name in each course is designated by an asterisk.

Details

Circuit World, vol. 7 no. 3
Type: Research Article
ISSN: 0305-6120

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Article
Publication date: 1 February 1985

About half an hour's drive from Heathrow airport and a similar distance from central London, yet located in a quiet suburban area of Surrey between relatively unspoilt…

Abstract

About half an hour's drive from Heathrow airport and a similar distance from central London, yet located in a quiet suburban area of Surrey between relatively unspoilt countryside and pleasant villages, is OMI's UK Research and Development Centre and manufacturing facility, visited by Circuit World early in December '84.

Details

Circuit World, vol. 11 no. 3
Type: Research Article
ISSN: 0305-6120

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Article
Publication date: 1 March 1985

Multicore Solders Ltd are pleased to announce that Jack Saw, Paul Salmon, Gordon Clarke and Tom Perrett have joined their commercial division. The decision of Billiton…

Abstract

Multicore Solders Ltd are pleased to announce that Jack Saw, Paul Salmon, Gordon Clarke and Tom Perrett have joined their commercial division. The decision of Billiton Solders, UK, to sell the assets of their profitable solder division to the Cookson group released the aforementioned personnel who will be pleased to maintain their contacts in the industry and offer the same personal service as is the Multicore tradition.

Details

Circuit World, vol. 11 no. 4
Type: Research Article
ISSN: 0305-6120

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Article
Publication date: 1 April 1979

ICI Mond Division has developed a new grade of “Arklone” for removing highly active flux residues remaining on printed circuit boards and electrical assemblies after soldering.

Abstract

ICI Mond Division has developed a new grade of “Arklone” for removing highly active flux residues remaining on printed circuit boards and electrical assemblies after soldering.

Details

Circuit World, vol. 6 no. 1
Type: Research Article
ISSN: 0305-6120

Content available
Article
Publication date: 1 March 2002

Abstract

Details

Circuit World, vol. 28 no. 1
Type: Research Article
ISSN: 0305-6120

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Article
Publication date: 8 December 2020

Xiaoyan Li, MengQian Wang, Gang Wu and Jiming Yao

The purpose of this study is to improve the performance of sodium borohydride in reducing indigo at room temperature, the divalent copper ion complex was combined with…

Abstract

Purpose

The purpose of this study is to improve the performance of sodium borohydride in reducing indigo at room temperature, the divalent copper ion complex was combined with electrochemical technology for the reduction of indigo by sodium borohydride.

Design/methodology/approach

According to the K/S value of the dyed cloth sample, find a more suitable ligand for the copper ion in the catholyte. Response surface analysis tests were performed to evaluate the effects of sodium borohydride concentration, sodium hydroxide concentration and copper sulfate pentahydrate concentration on the reduction potential of the dye solution and the K/S value of the dyed fabric samples.

Findings

Sodium gluconate was found to be a more suitable ligand for copper ions in catholyte. The effects of NaOH concentration as well as the interaction of NaBH4 and NaOH on the reduction potential of the catholyte and the K/S value of the dyed fabric samples were extremely significant. The optimal concentrations of NaBH4, NaOH and CuSO4•5H2O were 0.5, 2.5 and 0.65 g/L. In the case of the optimized condition, the absolute value of the reduction potential was 968, and the K/S value was 11.92, which is comparable with that of the conventional reduction process with sodium dithionite.

Originality/value

The divalent copper ion complex combined with electrochemical technology was applied in the process of reducing indigo with NaBH4 at room temperature.

Details

Pigment & Resin Technology, vol. 50 no. 3
Type: Research Article
ISSN: 0369-9420

Keywords

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