Search results for: J.G. Buijnsters

Items from 1 to 20 out of 30 results

article

High-performance graphene-based carbon nanofiller/polymer composites for piezoresistive sensor applications

P. Costa, J. Nunes-Pereira, J. Oliveira, J. Silva, more

Composites Science and Technology > 2017 > 153 > C > 241-252

Poly(vinylidene fluoride) (PVDF) composites with different carbonaceous nanofillers, prepared by solution casting, were studied their chemical, mechanical, electrical and electro-mechanical properties evaluated. Few-layer graphene (FLG) nanoplatelets (G-NPL), graphene oxide (GO) and reduced graphene oxide (rGO) and single-walled carbon nanohorns (SWCNH)) were found to have a strong influence in the...

article

Numerical modelling and experimental validation of debonding and heat transfer of carbon fiber reinforced composite under reciprocating sliding

H. Dhieb, S.A. Tabatabaei, G. Gordeev, J.G. Buijnsters, more

Composites Part B: Engineering > 2017 > 114 > C > 432-444

Compressive and shear stresses as well as the generation of heat are critical issues in the failure mechanism of carbon fiber reinforced epoxy composites under reciprocating sliding. In this work, the mechanical stress distribution and maximum surface temperature generated on the wear track by reciprocating sliding against stainless steel counter body are modelled numerically. The computational results...

article

Nanodiamonds/poly(vinylidene fluoride) composites for tissue engineering applications

J. Nunes-Pereira, A.R. Silva, C. Ribeiro, S.A.C. Carabineiro, more

Composites Part B: Engineering > 2017 > 111 > C > 37-44

Poly (vinylidene fluoride) (PVDF) composites with different types of nanodiamond (ND) particles were produced by solvent casting. The variations of the morphological, structural, optical, thermal and electrical properties of the composites were studied as a function of nanofiller type (without and with air oxidation treatment) and concentration (in the range 0.1–1 wt%). No noticeable differences were...

article

Effect of relative humidity and full immersion in water on friction, wear and debonding of unidirectional carbon fiber reinforced epoxy under reciprocating sliding

H. Dhieb, J.G. Buijnsters, K. Elleuch, J.P. Celis

Composites Part B: Engineering > 2016 > 88 > C > 240-252

Unidirectional carbon fiber reinforced epoxy was tested in ambient air at three different levels of relative humidity and under full immersion in demineralized water. Reciprocating sliding tests were performed at 23 °C against either stainless steel or alumina balls moving in parallel or anti-parallel direction to the fibers. We demonstrate in this work that humidity and water immersion affect significantly...

article

Growth dynamics of nanocrystalline diamond films produced by microwave plasma enhanced chemical vapor deposition in methane/hydrogen/air mixture: Scaling analysis of surface morphology

V. Podgursky, A. Bogatov, V. Sedov, I. Sildos, more

Diamond & Related Materials > 2015 > 58 > Complete > 172-179

Nanocrystalline diamond (NCD) films were produced by microwave plasma enhanced chemical vapor deposition (MPCVD) in methane/hydrogen/air plasma. The thickness of the films was varied from 0.15 to 22μm. X-ray diffraction (XRD), Raman spectroscopy and atomic force microscopy (AFM) were used to investigate the structure and surface morphology of the films. During a short initial period of the deposition,...

article

Nanostructured gradient Co-Sn electrodeposits as alternative to Sn connector contacts

E.P. Georgiou, J.G. Buijnsters, H. Wang, D. Drees, more

Surface & Coatings Technology > 2015 > 271 > Complete > 148-155

Gluconate plating baths were successfully used for the synthesis of homogenous, crack-free nanostructured gradient Co-Sn coatings. The grain size of electrodeposited Co-Sn sub-layers was found by X-ray Diffraction to range from 10 up to 143nm, whereas the increase of Sn content into the Co-Sn sub-layers led to an increase of average grain size. The average hardness of the gradient coating was found...

article

Surface and sub-surface degradation of unidirectional carbon fiber reinforced epoxy composites under dry and wet reciprocating sliding

H. Dhieb, J.G. Buijnsters, F. Eddoumy, L. Vázquez, more

Composites Part A > 2013 > 55 > Complete > 53-62

The role of water on the sub-surface degradation of unidirectional carbon fiber reinforced epoxy composite is examined. The correlation between the debonding of carbon fibers at the fiber–epoxy interface, and the wear behavior of the carbon fiber composite are discussed based on an in-depth analysis of the worn surfaces. We demonstrate that a reciprocating sliding performed along an anti-parallel...

article

Gold nanoparticles supported on carbon materials for cyclohexane oxidation with hydrogen peroxide

S.A.C. Carabineiro, L.M.D.R.S. Martins, M. Avalos-Borja, J.G. Buijnsters, more

Applied Catalysis A, General > 2013 > 467 > Complete > 279-290

Gold (1wt.%) was loaded on several types of carbon materials (activated carbon, polymer based carbon xerogels, multi-walled carbon nanotubes, nanodiamonds, microdiamonds, graphite and silicon carbide) using two different methods (sol immobilisation and double impregnation). Samples were characterised by N ₂ adsorption at −196°C, temperature programmed desorption, high-resolution transmission...

article

Effect of the metal concentration on the structural, mechanical and tribological properties of self-organized a-C:Cu hard nanocomposite coatings

A. Pardo, J.G. Buijnsters, J.L. Endrino, C. Gómez-Aleixandre, more

Applied Surface Science > 2013 > 280 > Complete > 791-798

The influence of the metal content (Cu: 0–28at.%) on the structural, mechanical and tribological properties of amorphous carbon films grown by pulsed filtered cathodic vacuum arc deposition is investigated. Silicon and AISI 301 stainless steel have been used as substrate materials. The microstructure, composition and bonding structure have been determined by scanning electron microscopy, combined...

article

Long-term H-release of hard and intermediate between hard and soft amorphous carbon evidenced by in situ Raman microscopy under isothermal heating

C. Pardanaud, C. Martin, G. Giacometti, P. Roubin, more

We study the kinetics of the H release from plasma-deposited hydrogenated amorphous carbon films under isothermal heating at 450, 500 and 600°C for long times up to several days using in situ Raman microscopy. Four Raman parameters are analyzed. They allow the identification of different processes such as the carbon network reorganization and the H release from sp ³ or sp ² carbon...

article

Friction and wear behavior of plasma assisted chemical vapor deposited nanocomposites made of metal nanoparticles embedded in a hydrogenated amorphous carbon matrix

A. Pardo, C. Gómez-Aleixandre, J.P. Celis, J.G. Buijnsters

Surface & Coatings Technology > 2012 > 206 > 13 > 3116-3124

Nanocomposite coatings consisting of preformed silver or chromium nanoparticles embedded into a hydrogenated amorphous carbon matrix (a-C:H) were synthesized by Electron Cyclotron Resonance plasma assisted Chemical Vapor Deposition (ECR-CVD). In a first step, the nanoparticles were distributed on silicon substrates by dipping in an ethanol suspension. In a second step, the ECR-CVD deposition of the...

article

Surface damage of unidirectional carbon fiber reinforced epoxy composites under reciprocating sliding in ambient air

H. Dhieb, J.G. Buijnsters, F. Eddoumy, J.P. Celis

Composites Science and Technology > 2011 > 71 > 15 > 1769-1776

For many technical applications friction and wear are critical issues. Reinforced polymer–matrix composites are widely used under vibrating contact condition in various automotive and aerospace applications as well as in structural engineering. In this paper, the friction and wear of bulk epoxy and unidirectional carbon fiber reinforced epoxy composite have been investigated under reciprocating sliding...

article

Nanostructured MoSx-based thin films obtained by electrochemical reduction

S.K. Ghosh, T. Bera, O. Karacasu, A. Swarnakar, more

Electrochimica Acta > 2011 > 56 > 5 > 2433-2442

The in situ electrochemical deposition of nanostructured MoS _x (x=1.5–1.7) based thin films on various substrates from aqueous solutions is reported. The as-deposited amorphous films transform on annealing into crystalline ones as revealed by a stepwise high temperature X-ray diffraction (XRD). Both Raman spectroscopy and XRD crystal structure analyses confirmed the formation of inorganic...

article

Tribological study of hydrogenated amorphous carbon films with tailored microstructure and composition produced by bias-enhanced plasma chemical vapour deposition

J.G. Buijnsters, M. Camero, L. Vázquez, F. Agulló-Rueda, more

Diamond & Related Materials > 2010 > 19 > 7-9 > 1093-1102

We investigated the mechanical and tribological properties of hydrogenated amorphous carbon (a-C:H) films on silicon substrates by nanoindentation, ball-on-disc tribotesting and scratch testing. The a-C:H films were deposited from an argon/methane gas mixture by bias-enhanced electron cyclotron resonance chemical vapour deposition (ECR-CVD). We found that substrate biasing directly influences the...

article

Comparison of GaN and AlN nucleation layers for the oriented growth of GaN on diamond substrates

G.W.G. van Dreumel, T. Bohnen, J.G. Buijnsters, W.J.P. van Enckevort, more

Diamond & Related Materials > 2010 > 19 > 5-6 > 437-440

In this study, {0001} oriented GaN crystals have been grown on freestanding, polycrystalline diamond substrates using AlN and GaN nucleation layers (NLs). XRD measurements and SEM analysis showed that the application of a thin AlN NL gives the best structural results, because AlN has a thermal expansion coefficient in between GaN and diamond and thus delocalizes the stress to two interfaces. The optical...

article

Growth and adhesion of hot filament chemical vapor deposited diamond coatings on surface modified high speed steel

M. Gowri, W.J.P. van Enckevort, J.J. Schermer, J.P. Celis, more

Diamond & Related Materials > 2009 > 18 > 12 > 1450-1458

Diamond coatings were deposited by hot filament chemical vapor deposition on high speed steel substrates. Iron boride diffusion barrier and WC–Co layers were used as interlayers. At high deposition pressure, the quality of the diamond deposits is poor due to the extensive formation of graphitic deposits. At low pressure, diamond films of better quality were obtained, but their adhesion to the substrate...

article

Substrate pre-treatment by ultrasonication with diamond powder mixtures for nucleation enhancement in diamond film growth

J.G. Buijnsters, L. Vázquez, J.J. ter Meulen

Diamond & Related Materials > 2009 > 18 > 10 > 1239-1246

Pre-treatment of silicon substrates by ultrasonic abrasion for nucleation enhancement in diamond film formation by hot-filament chemical vapour deposition is discussed. Scanning electron microscopy, atomic force microscopy and visible Raman spectroscopy were employed as analysis techniques. Ultrasonication was applied by suspensions of isopropanol with micro-or nanosized diamond powders, micro-sized...

article

Growth of GaN on nano-crystalline diamond substrates

G.W.G. van Dreumel, J.G. Buijnsters, T. Bohnen, J.J. ter Meulen, more

Diamond & Related Materials > 2009 > 18 > 5-8 > 1043-1047

In this study GaN has been grown on nano-crystalline diamond substrates utilizing metal-organic chemical vapour deposition (MOCVD). It is shown that the growth of closed GaN films onto synthetic diamond substrates is feasible, when applying the correct buffer layer and growth parameters. XRD measurements showed that the GaN formed is of wurzite structure and polycrystalline, but the high intensity...

article

Influence of external bias on the surface morphology of a-C:H films grown by electron cyclotron resonance chemical vapor deposition

J.G. Buijnsters, L. Vázquez

Surface & Coatings Technology > 2007 > 201 > 22-23 > 8950-8954

We have studied the influence of an external bias on the surface morphology of a-C:H films grown by electron cyclotron resonance chemical vapor deposition (ECR-CVD) on silicon substrates. We have deposited films for 1 h at different bias from +100 V down to −250 V and analyzed their surface morphology by atomic force microscopy (AFM). For biases equal or higher than −80 V the film morphology is cauliflower-like,...

article

Direct deposition of polycrystalline diamond onto steel substrates

J.G. Buijnsters, P. Shankar, J.J. Ter Meulen

Surface & Coatings Technology > 2007 > 201 > 22-23 > 8955-8960

The excellent characteristics of diamond such as its high wear resistance and chemical inertness raise the possibility to improve the performance and life time of industrial steel components by the deposition of a protective diamond coating. Therefore, we have investigated the direct deposition of diamond onto tool and stainless steel substrates by means of hot-filament-assisted chemical vapor deposition...

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Keywords

DIAMOND (5)
ADHESION (4)
STEEL (4)
DIFFUSION (3)
HOT FILAMENT CVD (3)
RECIPROCATING SLIDING (3)
TRIBOLOGY (3)
A. CARBON FIBER (2)
AMORPHOUS CARBON (2)
B. DEBONDING (2)
CHEMICAL VAPOR DEPOSITION (2)
CHEMICAL VAPOUR DEPOSITION (2)
CHROMIUM NITRIDE (2)
DIAMOND FILMS (2)
DIAMOND GROWTH AND CHARACTERIZATION (2)
GALLIUM NITRIDE (GAN) (2)
HYDROGENATED AMORPHOUS CARBON (2)
MICROSTRUCTURE (2)
MORPHOLOGY (2)
NUCLEATION (2)
RAMAN SPECTROSCOPY (2)
ROUGHNESS (2)
SYNTHETIC DIAMOND (2)
WEAR (2)
A. CARBON FIBERS (1)
A. POLYMER–MATRIX COMPOSITES (PMCS) (1)
AFM (1)
AMORPHOUS HYDROGENATED CARBON (1)
ATOMIC FORCE MICROSCOPY (1)
B. FRICTION/WEAR (1)
B. INTERFACE (1)
B. WEAR (1)
BIAS (1)
BORIDE INTERLAYER (1)
CARBON FIBERS (1)
CARBON MATERIALS (1)
CASTING (1)
CATALYSIS (1)
CATHODOLUMINESCENCE (1)
CELL CULTURE (1)
CHEMICAL VAPOUR DEPOSITION (CVD) (1)
CHROMIUM (1)
COEFFICIENT OF FRICTION (1)
COHESIVE INTERFACE MODELLING (1)
CORROSION POTENTIAL (1)
CVD (1)
CVD DIAMOND (1)
CYCLOHEXANE OXIDATION (1)
D. RAMAN SPECTROSCOPY (1)
D. SCANNING ELECTRON MICROSCOPY (1)
DEBONDING (1)
DIAMOND FILM (1)
ELECTRICAL PROPERTIES (1)
ELECTROCHEMICAL DEPOSITION (1)
ELECTRODEPOSITION (1)
FLAME DEPOSITION (1)
FRICTION (1)
FULLERENE (1)
FUNCTIONAL COMPOSITES (1)
GOLD NANOPARTICLES (1)
GRADIENT COATINGS (1)
GRAPHITIZATION (1)
GROWTH DYNAMICS (1)
HETEROSTRUCTURES (1)
HOT-FILAMENT CVD (1)
HYDROGEN (1)
HYDROGEN RETENTION (1)
HYDROGENATED AMORPHOUS CARBON (A-C:H) (1)
IF-MOS2 (1)
INTERLAYER (1)
ION BOMBARDMENT (1)
LONG-TERM HYDROGEN RELEASE (1)
MECHANICAL PROPERTIES (1)
METALLIC NANOPARTICLES (1)
MICROHARDNESS (1)
MOLYBDENUM (1)
MOS2 NANOTUBE (1)
MULTILAYER (1)
MULTILAYERED A-C:CU NANOCOMPOSITE (1)
NANOCOMPOSITE COATINGS (1)
NANOCRYSTALLINE DIAMOND FILMS (1)
NANODIAMONDS (1)
NANOSTRUCTURED (1)
NITRIDATION (1)
NITRIDED CHROMIUM (1)
NITROGEN (1)
OXYACETYLENE FLAME (1)
PACVD (1)
PLASMA CVD (1)
PLASMA-ENHANCED CVD (1)
POLY(VINYLIDENE FLUORIDE) (1)
POLYMER-MATRIX COMPOSITES (PMCS) (1)
PRETREATED SUBSTRATES (1)
PULSED FILTERED CATHODIC VACUUM ARC DEPOSITION (1)
RESIDUAL STRESS (1)
SCALING (1)
SCANNING ELECTRON MICROSCOPY (SEM) (1)
SMOOTHNESS (1)
SUB-SURFACE (1)
SUBSTRATE PRE-TREATMENT (1)
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INFONA - science communication portal

Search results for: J.G. Buijnsters

High-performance graphene-based carbon nanofiller/polymer composites for piezoresistive sensor applications

Numerical modelling and experimental validation of debonding and heat transfer of carbon fiber reinforced composite under reciprocating sliding

Nanodiamonds/poly(vinylidene fluoride) composites for tissue engineering applications

Effect of relative humidity and full immersion in water on friction, wear and debonding of unidirectional carbon fiber reinforced epoxy under reciprocating sliding

Growth dynamics of nanocrystalline diamond films produced by microwave plasma enhanced chemical vapor deposition in methane/hydrogen/air mixture: Scaling analysis of surface morphology

Nanostructured gradient Co-Sn electrodeposits as alternative to Sn connector contacts

Surface and sub-surface degradation of unidirectional carbon fiber reinforced epoxy composites under dry and wet reciprocating sliding

Gold nanoparticles supported on carbon materials for cyclohexane oxidation with hydrogen peroxide

Effect of the metal concentration on the structural, mechanical and tribological properties of self-organized a-C:Cu hard nanocomposite coatings

Long-term H-release of hard and intermediate between hard and soft amorphous carbon evidenced by in situ Raman microscopy under isothermal heating

Friction and wear behavior of plasma assisted chemical vapor deposited nanocomposites made of metal nanoparticles embedded in a hydrogenated amorphous carbon matrix

Surface damage of unidirectional carbon fiber reinforced epoxy composites under reciprocating sliding in ambient air

Nanostructured MoSx-based thin films obtained by electrochemical reduction

Tribological study of hydrogenated amorphous carbon films with tailored microstructure and composition produced by bias-enhanced plasma chemical vapour deposition

Comparison of GaN and AlN nucleation layers for the oriented growth of GaN on diamond substrates

Growth and adhesion of hot filament chemical vapor deposited diamond coatings on surface modified high speed steel

Substrate pre-treatment by ultrasonication with diamond powder mixtures for nucleation enhancement in diamond film growth

Growth of GaN on nano-crystalline diamond substrates

Influence of external bias on the surface morphology of a-C:H films grown by electron cyclotron resonance chemical vapor deposition

Direct deposition of polycrystalline diamond onto steel substrates

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