surface hydroxylation
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Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 165
Author(s):  
Julia Sánchez-Bodón ◽  
Jon Andrade del Olmo ◽  
Jose María Alonso ◽  
Isabel Moreno-Benítez ◽  
José Luis Vilas-Vilela ◽  
...  

Titanium (Ti) and its alloys have been demonstrated over the last decades to play an important role as inert materials in the field of orthopedic and dental implants. Nevertheless, with the widespread use of Ti, implant-associated rejection issues have arisen. To overcome these problems, antibacterial properties, fast and adequate osseointegration and long-term stability are essential features. Indeed, surface modification is currently presented as a versatile strategy for developing Ti coatings with all these challenging requirements and achieve a successful performance of the implant. Numerous approaches have been investigated to obtain stable and well-organized Ti coatings that promote the tailoring of surface chemical functionalization regardless of the geometry and shape of the implant. However, among all the approaches available in the literature to functionalize the Ti surface, a promising strategy is the combination of surface pre-activation treatments typically followed by the development of intermediate anchoring layers (self-assembled monolayers, SAMs) that serve as the supporting linkage of a final active layer. Therefore, this paper aims to review the latest approaches in the biomedical area to obtain bioactive coatings onto Ti surfaces with a special focus on (i) the most employed methods for Ti surface hydroxylation, (ii) SAMs-mediated active coatings development, and (iii) the latest advances in active agent immobilization and polymeric coatings for controlled release on Ti surfaces.


2021 ◽  
Vol 9 ◽  
Author(s):  
Jiashen Tian ◽  
Ryan J. Milcarek

The solid oxide fuel cell (SOFC) nickel-yttria stabilized zirconia (Ni-YSZ) anode degradation due to different types of siloxane contamination is investigated. A cyclic structure siloxane, octamethylcyclotetrasiloxane (D4), and a linear structure siloxane, decamethyltetrasiloxane (L4), are mixed with H2+N2 as the fuel for SOFCs at 750°C. The electrochemical characterization results after stability experiments suggest that the SOFC contaminated with cyclic siloxane, D4, had higher degradation. Pure YSZ pellets with different surface hydroxylation extents were also tested to investigate the D4/L4 adsorption and deposition process. Postmortem SEM/WDS, XRD and Raman analysis all indicate that cyclic siloxane has more deposition than linear siloxane on the anode. Further analysis demonstrates that high adsorption and low desorption rates of cyclic siloxane on YSZ are linked to the degradation. Besides the silicon deposition, SiC and amorphous carbon deposition were also observed from the XRD and Raman analysis.


Author(s):  
Yanhong Li ◽  
Qifeng Zhang ◽  
Yi Lu ◽  
Zhiting Song ◽  
Changjiang Wang ◽  
...  

Langmuir ◽  
2021 ◽  
Author(s):  
Dineli T. S. Ranathunga ◽  
Alexandra Arteaga ◽  
Claudia C. Biguetti ◽  
Danieli C. Rodrigues ◽  
Steven O. Nielsen

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Guozheng Shi ◽  
Haibin Wang ◽  
Yaohong Zhang ◽  
Chen Cheng ◽  
Tianshu Zhai ◽  
...  

AbstractAlmost all surfaces sensitive to the ambient environment are covered by water, whereas the impacts of water on surface-dominated colloidal quantum dot (CQD) semiconductor electronics have rarely been explored. Here, strongly hydrogen-bonded water on hydroxylated lead sulfide (PbS) CQD is identified. The water could pilot the thermally induced evolution of surface chemical environment, which significantly influences the nanostructures, carrier dynamics, and trap behaviors in CQD solar cells. The aggravation of surface hydroxylation and water adsorption triggers epitaxial CQD fusion during device fabrication under humid ambient, giving rise to the inter-band traps and deficiency in solar cells. To address this problem, meniscus-guided-coating technique is introduced to achieve dense-packed CQD solids and extrude ambient water, improving device performance and thermal stability. Our works not only elucidate the water involved PbS CQD surface chemistry, but may also achieve a comprehensive understanding of the impact of ambient water on CQD based electronics.


2021 ◽  
Author(s):  
Dineli Ranathunga ◽  
Alexandra Arteaga ◽  
Claudia C. Biguetti ◽  
Danieli C. Rodrigues ◽  
Steven O. Nielsen

<div><div><div><p>Due to its excellent chemical and mechanical properties, titanium has become the material of choice for orthopedic and dental implants to promote rehabilitation via bone anchorage and osseointegration. Titanium osseointegration is partially related to its capability to form a TiO<sub>2</sub> surface layer and its ability to interact with key endogenous proteins immediately upon implantation, establishing the first bone-biomaterial interface. Surgical trauma caused by implantation results in the release of High Mobility Group Box 1 (HMGB1) protein, which is a prototypic DAMP (Damage Associated Molecular Pattern) with multiple roles in inflammation and tissue healing. To develop different surface strategies that improve the clinical outcome of titanium-based implants by controlling their biological activity, a molecular-scale understanding of HMGB1-surface interactions is desired. Here, we use molecular dynamics (MD) computer simulations to provide direct insight into the HMGB1 interactions and the possible molecular arrangements of HMGB1 on fully hydroxylated and non-hydroxylated rutile (110) TiO<sub>2</sub> surfaces. The results establish that HMGB1 is most likely to be adsorbed directly onto the surface regardless of surface hydroxylation, which is undesirable because it could affect its biological activity by causing structural changes to the protein. The hydroxylated TiO<sub>2</sub> surface shows a greater affinity for HMGB1 than the non-hydroxylated surface. The water layer on the non-hydroxylated TiO<sub>2</sub> surface prevents ions and the protein from directly contacting the surface. However, it was observed that if the ionic strength increases, the total number of ions adsorbed on the two surfaces increases, and the protein’s direct adsorption ability decreases. These findings will help to understand the HMGB1-TiO<sub>2</sub> interactions upon implantation, as well as the development of different surface strategies by introducing ions or ionic materials to the titanium implant surface to modulate its interactions with HMGB1 to preserve biological function.</p></div></div></div>


2021 ◽  
Author(s):  
Dineli Ranathunga ◽  
Alexandra Arteaga ◽  
Claudia C. Biguetti ◽  
Danieli C. Rodrigues ◽  
Steven O. Nielsen

<div><div><div><p>Due to its excellent chemical and mechanical properties, titanium has become the material of choice for orthopedic and dental implants to promote rehabilitation via bone anchorage and osseointegration. Titanium osseointegration is partially related to its capability to form a TiO<sub>2</sub> surface layer and its ability to interact with key endogenous proteins immediately upon implantation, establishing the first bone-biomaterial interface. Surgical trauma caused by implantation results in the release of High Mobility Group Box 1 (HMGB1) protein, which is a prototypic DAMP (Damage Associated Molecular Pattern) with multiple roles in inflammation and tissue healing. To develop different surface strategies that improve the clinical outcome of titanium-based implants by controlling their biological activity, a molecular-scale understanding of HMGB1-surface interactions is desired. Here, we use molecular dynamics (MD) computer simulations to provide direct insight into the HMGB1 interactions and the possible molecular arrangements of HMGB1 on fully hydroxylated and non-hydroxylated rutile (110) TiO<sub>2</sub> surfaces. The results establish that HMGB1 is most likely to be adsorbed directly onto the surface regardless of surface hydroxylation, which is undesirable because it could affect its biological activity by causing structural changes to the protein. The hydroxylated TiO<sub>2</sub> surface shows a greater affinity for HMGB1 than the non-hydroxylated surface. The water layer on the non-hydroxylated TiO<sub>2</sub> surface prevents ions and the protein from directly contacting the surface. However, it was observed that if the ionic strength increases, the total number of ions adsorbed on the two surfaces increases, and the protein’s direct adsorption ability decreases. These findings will help to understand the HMGB1-TiO<sub>2</sub> interactions upon implantation, as well as the development of different surface strategies by introducing ions or ionic materials to the titanium implant surface to modulate its interactions with HMGB1 to preserve biological function.</p></div></div></div>


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