G. Stremsdoerfer - Academia.edu (original) (raw)

Papers by G. Stremsdoerfer

Innovative Materials and Systems for Energy Harvesting Applications, 2015

The use of solar energy as a renewable source is one of the most promising resources to generate ... more The use of solar energy as a renewable source is one of the most promising resources to generate electricity. The viability of concentrating solar power (CSP) systems depends on the development of highly reflective materials that are inexpensive and maintain their optical properties for extended lifetimes under outdoor environments. In this chapter, the implementation of flexible polymer substrates plated with silver by the Dynamic Chemical Plating technique (DCP) is proposed because of its low cost, and easy and rapid deposition, in addition to the high speed at which the deposit is made. However, the deposits made under this technique have certain nanoscale imperfections, which begin to exist certain permeability of substances that can stain the silver over time, so a study of this feature is performed, to help assess their durability.

Manufacturing Ternary Alloy NiBP-PTFE Composite Coatings by Dynamic Chemical Plating Process

Materials and Manufacturing Processes, 2014

ABSTRACT The dynamic chemical plating technique is used to deposit NiBP coatings with incorporati... more ABSTRACT The dynamic chemical plating technique is used to deposit NiBP coatings with incorporation of PTFE particles. This technique is faster and simpler to perform compared to other electroless deposition techniques. Using a double nozzle gun, metal salt solution and reducing agents are sprayed to the surface, forming a deposit. Using Scanning Electron Microscopy morphology of the coatings was studied. By dynamic chemical plating technique films with maximum incorporation rate of vol.% 21 PTFE were deposited. Tribological studies were conducted by a ball/surface tribometer, at different applied loads (5, 15, 30, 45, 60 N). Deposited films exhibited interesting tribological properties with a friction coefficient of 0.3 for a film containing vol.% 21 PTFE. The coating has a tendency to peel off locally at high applied loads. Friction coefficient increased with decreasing PTFE content.

Sensors and Actuators B: Chemical, 2003

The goal of our present work is to develop and test an optical fibre corrosion sensor (OFCS) fabr... more The goal of our present work is to develop and test an optical fibre corrosion sensor (OFCS) fabricated by an electroless copper film deposition onto an optical fibre core within the sensing region. In our case, corrosion monitoring was carried out by two methods: optical and electrochemical methods. The idea consists is to couple these two methods by correlating the parameters describing the optical detection and those which describe the electrochemical corrosion process. This approach, once is carried out, makes it possible to gain more precise information on degradation within hidden parts of metallic structures. #

Tribology International, 2015

These authors experimentally investigate the influence of multi-scale roughness on contact angle ... more These authors experimentally investigate the influence of multi-scale roughness on contact angle measurements, and they propose a model combining the Wenzel and Cassie-Baxter equations with the 3D roughness parameters defined by ISO25178. To do this, a generic methodology based on a statistical method (bootstrap and correlation coefficient) is developed and applied to a polypropylene textured femtosecond laser (55 surfaces, ablation depths¼ 5-45 μm and depth/diameter¼0.07-0.53). A mixed model is proposed according to the correlations obtained between the contact angle of a plane surface, θ 0 , and a textured surface, θ, with the roughness parameters as the developed surface, S dr , closed hills area, S ha and the closed dales area, S da , with regard to the models of Wenzel and Cassie-Baxter.

Journal of materials …, 2003

The present paper describes a new direct chemical plating method of copper, called Dynamic Chemic... more The present paper describes a new direct chemical plating method of copper, called Dynamic Chemical Plating. This low cost technology is based on spraying separate aqueous solutions containing copper metallic ions and Borohydride reducing agent. It is able to plate chemical copper at 30 µm/h at room temperature and may be used as an industrial process for metallizing polymers and non-conductors in general.

Surface and Coatings Technology, 2011

The acrylonitrile-butadiene-styrene (ABS) is the most commonly used copolymer in industry for met... more The acrylonitrile-butadiene-styrene (ABS) is the most commonly used copolymer in industry for metallizing. The process in solution used for depositing metallic films on non-conductive substrates is known as electroless, which is an autocatalytic procedure. However, the sulfo-chromic admixture used to modify the ABS surface, in the first step of this process, is not environmentally suitable due to the use of Cr (VI), and its utilization implies a risk of severe damage to living beings. For this reason, a study of an alternative surface treatment with substantially lower levels concerning environmental impact is presented in this work, which is based on a photocatalytic reaction that is initiated on the copolymer surface by TiO 2 nanoparticles (30 nm), as a suspension, under UV exposure. After surface conditioning with the photocatalytic treatment was conducted, the substrates were metallized in two different ways: electroless process or dynamic chemical process (DCP), with a subsequent conventional electrolytic deposit. The DCP does not need a surface activation with palladium ions, unlike electroless process, which simplified the procedure by reducing directly both, the effluents and the costs. The prepared substrates were characterized using: scanning electron microscopy (SEM), atomic force microscopy (AFM), atomic force acoustic microscopy (AFAM), mechanic profilometry, optical interference profilometry, profilometry by AFM, and a cross cut tape test. The results obtained with the proposed pre-treatment stage are shown and compared with those obtained in the conventional electroless process.

Scanning, 2013

We have investigated femtosecond (fs) laser (130 fs, 800 nm, 5 kHz) ablation of polypropylene (PP... more We have investigated femtosecond (fs) laser (130 fs, 800 nm, 5 kHz) ablation of polypropylene (PP). The following laser process conditions were varied: power density and number of pulses. The morphological parameters' response (depth, ablation diameter, ablation volume) to the laser process conditions, measured by an optical profiler, was investigated by the statistical analysis technique to determine the relationship between them. For this, the simple linear regression and the multiple linear regressions are compared. The simple linear regression shows that the ablation volume follows a linear relationship with the product of the power and the number of pulse. SCANNING 9999:1-9, 2013.

Materials and Corrosion, 2001

This paper describes the aerosol size distribution properties and characteristics of a Ni-B-Zn te... more This paper describes the aerosol size distribution properties and characteristics of a Ni-B-Zn ternary alloy deposited using a new dynamic chemical plating process. The influcence of the aerosol parameters on the metallic film deposition rate and output was discussed as well as their influence on the Zn deposition ratio in the ternary Ni-B-Zn alloy. The optimal aerosol volume distribution seems to be around 120 lm (diameter). The zinc percentage in the metallic deposit is influenced by the droplets size of the aerosol and the correct control of this parameter allows to obtain a metallic coating with improved corrosion protection properties.

Use of Au-In-Pd and Pd-In Electroless Deposits for Ohmic Contacts on n-GaAs

Journal of The Electrochemical Society, 1990

Codeposition of gold-palladium-indium and palladium-indium alloys onto n-GaAs substrates is obtai... more Codeposition of gold-palladium-indium and palladium-indium alloys onto n-GaAs substrates is obtained in an acidic medium by the electroless method. The preparation and characteristics of the different baths are presented. For the Pd-In alloys, a crystalline refractory Pd(In)â compound is initially formed, whereas after a 2 min annealing treatment at 470°C traces of InAs and PdGa are found. A high-quality ohmic

Deposition of thin films of Ni–P and Ni–B–P by dynamic chemical plating

Journal of Alloys and Compounds, 2008

The dynamic chemical plating (DCP) method is a wet deposition technique that has been shown to be... more The dynamic chemical plating (DCP) method is a wet deposition technique that has been shown to be a good alternative to produce deposits of single metals as Cu, Ni and Ag. In this work, the capability of DCP to deposit both binary (Ni–P) and ternary nickel alloys (Ni–P–B) is evaluated. These deposits are particularly interesting because of their mechanical and

Wet Technique" Metal Deposition for SEM Observation

Microscopy Microanalysis Microstructures, 1995

Innovative Materials and Systems for Energy Harvesting Applications, 2015

The use of solar energy as a renewable source is one of the most promising resources to generate ... more The use of solar energy as a renewable source is one of the most promising resources to generate electricity. The viability of concentrating solar power (CSP) systems depends on the development of highly reflective materials that are inexpensive and maintain their optical properties for extended lifetimes under outdoor environments. In this chapter, the implementation of flexible polymer substrates plated with silver by the Dynamic Chemical Plating technique (DCP) is proposed because of its low cost, and easy and rapid deposition, in addition to the high speed at which the deposit is made. However, the deposits made under this technique have certain nanoscale imperfections, which begin to exist certain permeability of substances that can stain the silver over time, so a study of this feature is performed, to help assess their durability.

Manufacturing Ternary Alloy NiBP-PTFE Composite Coatings by Dynamic Chemical Plating Process

Materials and Manufacturing Processes, 2014

ABSTRACT The dynamic chemical plating technique is used to deposit NiBP coatings with incorporati... more ABSTRACT The dynamic chemical plating technique is used to deposit NiBP coatings with incorporation of PTFE particles. This technique is faster and simpler to perform compared to other electroless deposition techniques. Using a double nozzle gun, metal salt solution and reducing agents are sprayed to the surface, forming a deposit. Using Scanning Electron Microscopy morphology of the coatings was studied. By dynamic chemical plating technique films with maximum incorporation rate of vol.% 21 PTFE were deposited. Tribological studies were conducted by a ball/surface tribometer, at different applied loads (5, 15, 30, 45, 60 N). Deposited films exhibited interesting tribological properties with a friction coefficient of 0.3 for a film containing vol.% 21 PTFE. The coating has a tendency to peel off locally at high applied loads. Friction coefficient increased with decreasing PTFE content.

Sensors and Actuators B: Chemical, 2003

The goal of our present work is to develop and test an optical fibre corrosion sensor (OFCS) fabr... more The goal of our present work is to develop and test an optical fibre corrosion sensor (OFCS) fabricated by an electroless copper film deposition onto an optical fibre core within the sensing region. In our case, corrosion monitoring was carried out by two methods: optical and electrochemical methods. The idea consists is to couple these two methods by correlating the parameters describing the optical detection and those which describe the electrochemical corrosion process. This approach, once is carried out, makes it possible to gain more precise information on degradation within hidden parts of metallic structures. #

Tribology International, 2015

These authors experimentally investigate the influence of multi-scale roughness on contact angle ... more These authors experimentally investigate the influence of multi-scale roughness on contact angle measurements, and they propose a model combining the Wenzel and Cassie-Baxter equations with the 3D roughness parameters defined by ISO25178. To do this, a generic methodology based on a statistical method (bootstrap and correlation coefficient) is developed and applied to a polypropylene textured femtosecond laser (55 surfaces, ablation depths¼ 5-45 μm and depth/diameter¼0.07-0.53). A mixed model is proposed according to the correlations obtained between the contact angle of a plane surface, θ 0 , and a textured surface, θ, with the roughness parameters as the developed surface, S dr , closed hills area, S ha and the closed dales area, S da , with regard to the models of Wenzel and Cassie-Baxter.

Journal of materials …, 2003

The present paper describes a new direct chemical plating method of copper, called Dynamic Chemic... more The present paper describes a new direct chemical plating method of copper, called Dynamic Chemical Plating. This low cost technology is based on spraying separate aqueous solutions containing copper metallic ions and Borohydride reducing agent. It is able to plate chemical copper at 30 µm/h at room temperature and may be used as an industrial process for metallizing polymers and non-conductors in general.

Surface and Coatings Technology, 2011

The acrylonitrile-butadiene-styrene (ABS) is the most commonly used copolymer in industry for met... more The acrylonitrile-butadiene-styrene (ABS) is the most commonly used copolymer in industry for metallizing. The process in solution used for depositing metallic films on non-conductive substrates is known as electroless, which is an autocatalytic procedure. However, the sulfo-chromic admixture used to modify the ABS surface, in the first step of this process, is not environmentally suitable due to the use of Cr (VI), and its utilization implies a risk of severe damage to living beings. For this reason, a study of an alternative surface treatment with substantially lower levels concerning environmental impact is presented in this work, which is based on a photocatalytic reaction that is initiated on the copolymer surface by TiO 2 nanoparticles (30 nm), as a suspension, under UV exposure. After surface conditioning with the photocatalytic treatment was conducted, the substrates were metallized in two different ways: electroless process or dynamic chemical process (DCP), with a subsequent conventional electrolytic deposit. The DCP does not need a surface activation with palladium ions, unlike electroless process, which simplified the procedure by reducing directly both, the effluents and the costs. The prepared substrates were characterized using: scanning electron microscopy (SEM), atomic force microscopy (AFM), atomic force acoustic microscopy (AFAM), mechanic profilometry, optical interference profilometry, profilometry by AFM, and a cross cut tape test. The results obtained with the proposed pre-treatment stage are shown and compared with those obtained in the conventional electroless process.

Scanning, 2013

We have investigated femtosecond (fs) laser (130 fs, 800 nm, 5 kHz) ablation of polypropylene (PP... more We have investigated femtosecond (fs) laser (130 fs, 800 nm, 5 kHz) ablation of polypropylene (PP). The following laser process conditions were varied: power density and number of pulses. The morphological parameters' response (depth, ablation diameter, ablation volume) to the laser process conditions, measured by an optical profiler, was investigated by the statistical analysis technique to determine the relationship between them. For this, the simple linear regression and the multiple linear regressions are compared. The simple linear regression shows that the ablation volume follows a linear relationship with the product of the power and the number of pulse. SCANNING 9999:1-9, 2013.

Materials and Corrosion, 2001

This paper describes the aerosol size distribution properties and characteristics of a Ni-B-Zn te... more This paper describes the aerosol size distribution properties and characteristics of a Ni-B-Zn ternary alloy deposited using a new dynamic chemical plating process. The influcence of the aerosol parameters on the metallic film deposition rate and output was discussed as well as their influence on the Zn deposition ratio in the ternary Ni-B-Zn alloy. The optimal aerosol volume distribution seems to be around 120 lm (diameter). The zinc percentage in the metallic deposit is influenced by the droplets size of the aerosol and the correct control of this parameter allows to obtain a metallic coating with improved corrosion protection properties.

Use of Au-In-Pd and Pd-In Electroless Deposits for Ohmic Contacts on n-GaAs

Journal of The Electrochemical Society, 1990

Codeposition of gold-palladium-indium and palladium-indium alloys onto n-GaAs substrates is obtai... more Codeposition of gold-palladium-indium and palladium-indium alloys onto n-GaAs substrates is obtained in an acidic medium by the electroless method. The preparation and characteristics of the different baths are presented. For the Pd-In alloys, a crystalline refractory Pd(In)â compound is initially formed, whereas after a 2 min annealing treatment at 470°C traces of InAs and PdGa are found. A high-quality ohmic

Deposition of thin films of Ni–P and Ni–B–P by dynamic chemical plating

Journal of Alloys and Compounds, 2008

The dynamic chemical plating (DCP) method is a wet deposition technique that has been shown to be... more The dynamic chemical plating (DCP) method is a wet deposition technique that has been shown to be a good alternative to produce deposits of single metals as Cu, Ni and Ag. In this work, the capability of DCP to deposit both binary (Ni–P) and ternary nickel alloys (Ni–P–B) is evaluated. These deposits are particularly interesting because of their mechanical and

Wet Technique" Metal Deposition for SEM Observation

Microscopy Microanalysis Microstructures, 1995