Surface characterisation of nickel boride and nickel phosphide catalysts by X-ray photoelectron spectroscopy

1979 ◽  
Vol 75 (0) ◽  
pp. 2027 ◽  
Author(s):  
Yasuaki Okamoto ◽  
Yuriko Nitta ◽  
Toshinobu Imanaka ◽  
Shiichiro Teranishi
Keyword(s):  
Photoelectron Spectroscopy ◽  
Nickel Phosphide ◽  
Surface Characterisation ◽  
Nickel Boride ◽  
X Ray

scholarly journals The Surface Characterisation of Fused Filament Fabricated (FFF) 3D Printed PEEK/Hydroxyapatite Composites

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3117
Author(s):  
Krzysztof Rodzeń ◽  
Mary Josephine McIvor ◽  
Preetam K. Sharma ◽  
Jonathan G. Acheson ◽  
Alistair McIlhagger ◽  
...  
Keyword(s):  
3D Printing ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Secondary Ion Mass Spectrometry ◽  
Fused Filament Fabrication ◽  
Surface Characterisation ◽  
X Ray ◽  
3D Printed

Polyetheretherketone (PEEK) is a high-performance thermoplastic polymer which has found increasing application in orthopaedics and has shown a lot of promise for ‘made-to-measure’ implants via additive manufacturing approaches. However, PEEK is bioinert and needs to undergo surface modification to make it at least osteoconductive to ensure a more rapid, improved, and stable fixation that will last longer in vivo. One approach to solving this issue is to modify PEEK with bioactive agents such as hydroxyapatite (HA). The work reported in this study demonstrates the direct 3D printing of PEEK/HA composites of up to 30 weight percent (wt%) HA using a Fused Filament Fabrication (FFF) approach. The surface characteristics and in vitro properties of the composite materials were investigated. X-ray diffraction revealed the samples to be semi-crystalline in nature, with X-ray Photoelectron Spectroscopy and Time-of-Flight Secondary Ion Mass Spectrometry revealing HA materials were available in the uppermost surface of all the 3D printed samples. In vitro testing of the samples at 7 days demonstrated that the PEEK/HA composite surfaces supported the adherence and growth of viable U-2 OS osteoblast like cells. These results demonstrate that FFF can deliver bioactive HA on the surface of PEEK bio-composites in a one-step 3D printing process.

scholarly journals Biofunctionalisation of Gallium Arsenide with Neutravidin

2021 ◽  
Author(s):  
Barbara Santos Gomes ◽  
David Morgan ◽  
Wolfgang Langbein ◽  
Paola Borri ◽  
Francesco Masia
Keyword(s):  
Spectroscopic Ellipsometry ◽  
Photoelectron Spectroscopy ◽  
Specific Binding ◽  
Gaas Surface ◽  
Biomolecular Recognition ◽  
Surface Characterisation ◽  
X Ray ◽  
High Affinity ◽  
Surface Functionalisation ◽  
New Generation

<div>We report a study presenting a physicochemical surface characterisation of the GaAs surface along the functionalisation with a high-affinity bioconjugation pair widely explored in the life</div><div>sciences: biotin and neutravidin. Combined X-ray photoelectron spectroscopy (XPS), wettability measurements and spectroscopic ellipsometry were used for a reliable characterisation of the surface functionalisation process. The results suggest that a film with a thickness lower than 10nm was formed, with a neutravidin to biotin ratio of 1:25 on the GaAs surface. Reduction of non-specific binding of the protein to the surface was achieved by optimising the protein buffer and rinsing steps. This study shows the feasibility of using GaAs as a platform for specific biomolecular recognition, paving the way to a new generation of optoelectronic biosensors.</div>

scholarly journals Biofunctionalisation of Gallium Arsenide with Neutravidin

2021 ◽  
Author(s):  
Barbara Santos Gomes ◽  
David Morgan ◽  
Wolfgang Langbein ◽  
Paola Borri ◽  
Francesco Masia
Keyword(s):  
Spectroscopic Ellipsometry ◽  
Photoelectron Spectroscopy ◽  
Specific Binding ◽  
Gaas Surface ◽  
Biomolecular Recognition ◽  
Surface Characterisation ◽  
X Ray ◽  
High Affinity ◽  
Surface Functionalisation ◽  
New Generation

<div>We report a study presenting a physicochemical surface characterisation of the GaAs surface along the functionalisation with a high-affinity bioconjugation pair widely explored in the life</div><div>sciences: biotin and neutravidin. Combined X-ray photoelectron spectroscopy (XPS), wettability measurements and spectroscopic ellipsometry were used for a reliable characterisation of the surface functionalisation process. The results suggest that a film with a thickness lower than 10nm was formed, with a neutravidin to biotin ratio of 1:25 on the GaAs surface. Reduction of non-specific binding of the protein to the surface was achieved by optimising the protein buffer and rinsing steps. This study shows the feasibility of using GaAs as a platform for specific biomolecular recognition, paving the way to a new generation of optoelectronic biosensors.</div>

Surface characterisation of plasma-nitrided iron by X-ray photoelectron spectroscopy

1999 ◽  
Vol 144-145 ◽  
pp. 272-277 ◽  
Author(s):  
Eduardo J Miola ◽  
Sylvio D de Souza ◽  
Pedro A.P Nascente ◽  
Maristela Olzon-Dionysio ◽  
Carlos A Olivieri ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Surface Characterisation ◽  
X Ray
Sign in / Sign up

Export Citation Format

Share Document