scholarly journals The Study on the Anti-corrosion Performance of NiTi Alloy in Human Body Solution with the Fabricating Processes of Laser Irradiation and PDMS Modification

2021 ◽  
Vol 18 (1) ◽  
pp. 77-91
Author(s):  
Chengjuan Yang ◽  
Weiran Cao ◽  
Zhen Yang ◽  
Meng Wang ◽  
Xiubing Jing ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Niti Alloy ◽  
Hydrophobic Surface ◽  
Niti Shape Memory Alloy ◽  
Corrosion Performance ◽  
Hydrophobic Surfaces ◽  
Sliding Angle ◽  
Water Contact

AbstractThis paper presents a new and safe method of fabricating super-hydrophobic surface on NiTi Shape Memory Alloy (SMA), which aims to further improve the corrosion resistance performance and biocompatibility of NiTi SMA. The super-hydrophobic surfaces with Water Contact Angle (WCA) of 155.4° ± 0.9° and Water Sliding Angle (WSA) of 4.4° ± 1.1° were obtained by the hybrid of laser irradiation and polydimethylsiloxane (PDMS) modification. The forming mechanism was systematically revealed via Scanning Electron Microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS). The anti-corrosion of samples was investigated in Simulated Body Fluid (SBF) via the potentiodynamic polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS) tests. PDMS super-hydrophobic coatings showed superior anti-corrosion performance. The Ni ions release experiment was also conducted and the corresponding result demonstrated that the super-hydrophobic samples effectively inhibited the release of Ni ions both in electrolyte and SBF. Besides, biocompatibility was further analyzed, indicating that the prepared super-hydrophobic surfaces present a huge potential advantage in biocompatibility.

scholarly journals In Vitro Corrosion Studies of Surface Modified NiTi Alloy for Biomedical Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Manju Chembath ◽  
J. N. Balaraju ◽  
M. Sujata
Keyword(s):  
Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Niti Alloy ◽  
Passive Layer ◽  
Water Contact ◽  
Force Microscopy ◽  
Corrosion Studies ◽  
Surface Modified

Electropolishing was conducted on NiTi alloy of composition 49.1 Ti-50.9 Ni at.% under potentiostatic regime at ambient temperature using perchloric acid based electrolyte for 30 sec followed by passivation treatment in an inorganic electrolyte. The corrosion resistance and biocompatibility of the electropolished and passivated alloys were evaluated and compared with mechanically polished alloy. Various characterization techniques like scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy were employed to analyze the properties of surface modified and mechanically polished alloys. Water contact angle measurements made on the passivated alloy after electropolishing showed a contact angle of 35.6°, which was about 58% lower compared to mechanically polished sample, implying more hydrophilicity. The electrochemical impedance studies showed that, for the passivated alloy, threefold increase in the barrier layer resistance was obtained when compared to electropolished alloy due to the formation of compact titanium oxide. The oxide layer thickness of the passivated samples was almost 18 times higher than electropolished samples. After 14 days immersion in Hanks’ solution, the amount of nickel released was 315 ppb which was nearly half of that obtained for mechanically polished NiTi alloy, confirming better stability of the passive layer.

scholarly journals Waterborne Polyurea Coatings Filled with Sulfonated Graphene Improved Anti-Corrosion Performance

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 251
Author(s):  
Jijia Zhang ◽  
Jihu Wang ◽  
Shaoguo Wen ◽  
Siwei Li ◽  
Yabo Chen ◽  
...  
Keyword(s):  
Composite Coating ◽  
Water Resistance ◽  
Electrochemical Impedance ◽  
Water Immersion ◽  
Doping Content ◽  
Corrosion Performance ◽  
Water Contact ◽  
Sulfonated Graphene ◽  
Long Time ◽  
Scanning Electron

In this paper, an environmentally friendly waterborne polyurea (WPUA) emulsion and its corresponding coating were prepared, which was characterized by dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), and scanning electron microscopy (SEM). To improve the performance of the coating, we doped sulfonated graphene (SG) into WPUA to prepare composite coating (SG/WPUA). SG can be uniformly dispersed in WPUA emulsion and is stable for a long time (28 days) without delamination. The water resistance of the composite coating with 0.3 wt.% SG nanofiller was improved; the water contact angle (WCA) result was SG/WPUA (89°) > WPUA (48.5°), and water absorption result was SG/WPUA (2.90%) < WPUA (9.98%). After water immersion treatment, SEM observation revealed that the SG/WPUA film only generated enlarged microcracks (100 nm) instead of holes (150–400 nm, WPUA film). Polarization curves and electrochemical impedance spectroscopy (EIS) tests show that SG nanosheets with low doping content (0.3 wt.%) are more conducive to the corrosion resistance of WPUA coatings, and the model was established to explain the mechanism.

scholarly journals Key Properties of a Bioactive Ag-SiO2/TiO2 Coating on NiTi Shape Memory Alloy as Necessary at the Development of a New Class of Biomedical Materials

2021 ◽  
Vol 22 (2) ◽  
pp. 507
Author(s):  
Mateusz Dulski ◽  
Robert Gawecki ◽  
Sławomir Sułowicz ◽  
Michal Cichomski ◽  
Alicja Kazek-Kęsik ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Dermal Fibroblast ◽  
Niti Alloy ◽  
Bacterial Biofilm ◽  
Niti Shape Memory Alloy ◽  
Normal Human Dermal Fibroblast ◽  
Water Contact ◽  
Nano Coating

Recent years have seen the dynamic development of methods for functionalizing the surface of implants using biomaterials that can mimic the physical and mechanical nature of native tissue, prevent the formation of bacterial biofilm, promote osteoconduction, and have the ability to sustain cell proliferation. One of the concepts for achieving this goal, which is presented in this work, is to functionalize the surface of NiTi shape memory alloy by an atypical glass-like nanocomposite that consists of SiO2-TiO2 with silver nanoparticles. However, determining the potential medical uses of bio(nano)coating prepared in this way requires an analysis of its surface roughness, tribology, or wettability, especially in the context of the commonly used reference coat-forming hydroxyapatite (HAp). According to our results, the surface roughness ranged between (112 ± 3) nm (Ag-SiO2)—(141 ± 5) nm (HAp), the water contact angle was in the range (74.8 ± 1.6)° (Ag-SiO2)—(70.6 ± 1.2)° (HAp), while the surface free energy was in the range of 45.4 mJ/m2 (Ag-SiO2)—46.8 mJ/m2 (HAp). The adhesive force and friction coefficient were determined to be 1.04 (Ag-SiO2)—1.14 (HAp) and 0.247 ± 0.012 (Ag-SiO2) and 0.397 ± 0.034 (HAp), respectively. The chemical data showed that the release of the metal, mainly Ni from the covered NiTi substrate or Ag from Ag-SiO2 coating had a negligible effect. It was revealed that the NiTi alloy that was coated with Ag-SiO2 did not favor the formation of E. coli or S. aureus biofilm compared to the HAp-coated alloy. Moreover, both approaches to surface functionalization indicated good viability of the normal human dermal fibroblast and osteoblast cells and confirmed the high osteoconductive features of the biomaterial. The similarities of both types of coat-forming materials indicate an excellent potential of the silver-silica composite as a new material for the functionalization of the surface of a biomaterial and the development of a new type of functionalized implants.

Establishing Chemical Bond Layer of Poly(Ethylene Glycol) on NiTi Alloy Surface

2013 ◽  
Vol 785-786 ◽  
pp. 578-581
Author(s):  
Hong Yan Yu ◽  
Lian Cai Wang ◽  
Yan Li ◽  
Xin Miao Zeng ◽  
Xin Qing Zhao
Keyword(s):  
Ethylene Glycol ◽  
Photoelectron Spectroscopy ◽  
Niti Alloy ◽  
Covalent Bond ◽  
Niti Shape Memory Alloy ◽  
Poly Ethylene Glycol ◽  
Γ Irradiation ◽  
Piranha Solution ◽  
Bond Layer ◽  
Poly Ethylene

To get bioorganic surface with improving biological properties, NiTi shape memory alloy was bonded poly (ethylene glycol) (PEG) by sequentially piranha solution treating, silanizing, and then γ-ray irradiation induced grafting. Piranha solution treating gave hydroxylated surfaces for the benefit of next silanization. The trichlorovinylsilane (TCVS) was performed as a bridge to covalent bond treated NiTi substrates and PEG by γ-irradiation. X-ray photoelectron spectroscopy (XPS) was used to indicate that PEG was bonded on silanized NiTi surface by irradiation. Osteoblast culture of 1 day and methyl-thiazol-tetrazolium (MTT) assay showed that PEG bonded on NiTi surface enhanced cell proliferation and cell amount increased significantly with increasing the concentration of bonded PEG.

Fabrication of Superhydrophobic Surfaces on Aluminum Alloy by Simple Chemical Etching Method

2011 ◽  
Vol 239-242 ◽  
pp. 2270-2273 ◽  
Author(s):  
Yong Feng Luo ◽  
Hai Yan Lang ◽  
Jin Liang ◽  
Guo Sheng Peng ◽  
You Hua Fan ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Chemical Etching ◽  
Optical Methods ◽  
Hydrophobic Surfaces ◽  
Sliding Angle ◽  
Water Contact ◽  
Binary Structure ◽  
Etching Method ◽  
Simple Chemical ◽  
Scanning Electron

A facial chemical etching method was developed for fabricating stable super-hydrophobic surfaces on aluminum alloy foils. The microstructure and wettability of super-hydrophobic surfaces were characterized by scanning electron microscopy, water contact angle (CA) measurement, and optical methods. The surfaces of the modified aluminum alloy substrates exhibit superhydrophobicity, with a CA of 164.8°±1.6° and a water sliding angle of about 5°. The etched surfaces have binary structure consisting of the irregular microscale plateaus and caves in which there are the nanoscale block-like convexes and hollows.

An investigation into the anti-icing properties of fabrics used for the outer layer of firefighter clothing

2018 ◽  
Vol 89 (8) ◽  
pp. 1500-1511 ◽  
Author(s):  
Lun Han ◽  
Xiaoming Zhao ◽  
Jannette Eveline Kidalla
Keyword(s):  
Outer Layer ◽  
Photoelectron Spectroscopy ◽  
Smooth Surface ◽  
Hydrophobic Surface ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Hydrophobic Coating ◽  
Before And After ◽  
Coating Method ◽  
Fabric Surface

The anti-icing properties of fabrics can be considered as involving two parts, the super-hydrophobic property and the ease of ice removal property. In this study, a super-hydrophobic surface was built on to the outer layer of firefighter clothing using nano-silica, C13H13F17O3Si, C19H42O3Si and PU-2540 using a coating method. This coating stops water drops from staying on the fabric surface easily. At the same time, an ultra-smooth surface was built on to the super-hydrophobic surface already created on the fabric using perfluoropolyethers (PFPE) oil by a dipping method, which adds an ice removal function to the fabrics. The anti-icing properties of the samples prepared in the research described in this paper have been investigated using field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), ease of ice removal property tests and static water contact angle analysis. At the same time, the thermal protective performance (TPP) of the samples, before and after super-hydrophobic treatment, was studied by a TPP tester. Results show that the super-hydrophobic coating with an ultra-smooth surface can significantly increase the anti-icing properties of the fabrics used for the outer layer of firefighter clothing. C13H13F17O3Si and C19H42O3Si can improve the hydrophobic properties of the coating. The anti-icing coating in this paper can increase the TPP of the fabrics.

scholarly journals Functionalization of the NiTi Shape Memory Alloy Surface by HAp/SiO2/Ag Hybrid Coatings Formed on SiO2-TiO2 Glass Interlayer

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1648 ◽  
Author(s):  
Karolina Dudek ◽  
Mateusz Dulski ◽  
Bożena Łosiewicz
Keyword(s):  
Heat Treatment ◽  
Shape Memory ◽  
Electrochemical Impedance ◽  
Niti Alloy ◽  
Composite Coatings ◽  
Energy Dispersive Spectrometer ◽  
Weight Ratio ◽  
Hybrid Coatings ◽  
Niti Shape Memory Alloy ◽  
Niti Shape Memory Alloys

The surface modification of NiTi shape memory alloys is a method for increasing their multi-functionalities. In our solution, hydroxyapatite powder was mixed with a chemically synthesized silicon dioxide/silver (nSiO2/Ag) nanocomposite in a different weight ratio between components (1:1, 5:1, and 10:1) and then electrophoretically deposited on the surface of the NiTi alloy, under various time and voltage conditions. Subsequently, uniform layers were subjected to heat treatment at 700 °C for 2 h in an argon atmosphere to improve the strength of their adhesion to the NiTi substrate. A change in linear dimensions of the co-deposited materials during the sintering process was also analyzed. After the heat treatment, XRD, Raman, and Scanning Electron Microscopy (SEM) + Energy Dispersive Spectrometer (EDS) studies revealed the formation of completely new composite coatings, which consisted of rutile and TiO2-SiO2 glass with silver oxide and HAp particles that were embedded into such coatings. It was found that spalling characterized the 1:1 ratio coating, while the others were crack-free, well-adhered, and capable of deformation to 3.5%. Coatings with a higher concentration of nanocomposite were rougher. Electrochemical impedance spectroscopy (EIS) tests in Ringer’s solution revealed the capacitive behavior of the material with high corrosion resistance. The kinetics and susceptibility to pitting corrosion was the highest for the NiTi electrode that was coated with a 5:1 ratio HAp/nSiO2/Ag hybrid coating.

scholarly journals Facile Fabrication of Breathable and Superhydrophobic Fabric Based on Silica Nanoparticles and Amino‐Modified Polydimethylsiloxane

2020 ◽  
Author(s):  
Mahdi Hasanzadeh ◽  
Hossein Shahriyari Far ◽  
Aminoddin Haji ◽  
Giuseppe Rosace
Keyword(s):  
Contact Angle ◽  
Silica Nanoparticles ◽  
Water Contact Angle ◽  
Average Particle Size ◽  
Hydrophobic Surface ◽  
Water Repellency ◽  
Average Particle ◽  
Sliding Angle ◽  
Water Contact ◽  
Fabric Surface

This work attempted to fabricate superhydrophobic fabric via simple immersion technique. Textile fabrics were coated with silica nanoparticles prepared from tetraethoxysilane (TEOS) to obtain sufficient roughness with hydrophobic surface chemistry. Then the coated fabrics were treated with polydimethylsiloxane (PDMS) and aminopropyltriethoxysilane (APTES) to reduce the surface energy. The effects of PDMS concentration on the surface morphology and superhydrophobicity of as-prepared fabric were investigated. The morphology and the composition of superhydrophobic fabric was characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDS) and Fourier transform infrared (FTIR) spectroscopy. The results revealed the formation of spherical silica nanoparticles with average particle size of 250 nm throughout the fabric surface. The possible interactions between silica nanoparticles and APTES, as well as the fabrics were elucidated. Investigating the hydrophobicity of fabrics via water contact angle (WCA) measurement showed that the treated fabric exhibits excellent water repellency with a water contact angle as high as 151&deg; and a very low water sliding angle. It also found that the treated fabric maintained most of its hydrophobicity against repeated washing. The comfort properties of the obtained superhydrophobic fabrics in term of air permeability and bending length did not reveal any significant changes.

Surface Structure and Anti-Corrosion Properties of Copper Treated by a Dopamine-Assisted 11-Mercaptoundecanoic Acid Film

CORROSION ◽  
10.5006/0462 ◽  
2012 ◽  
Vol 68 (8) ◽  
pp. 747-753 ◽  
Author(s):  
Y. Chen ◽  
S. Chen ◽  
Y. Lei
Keyword(s):  
Corrosion Resistance ◽  
Surface Structure ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Copper Substrate ◽  
Adhesive Force ◽  
Angle Measurement ◽  
Corrosion Properties ◽  
Water Contact ◽  
Complex Film

An 11-mercaptoundecanoic acid (MUA) film was successfully prepared on the dopamine-modified copper substrates with good adhesive force and corrosion resistance. The formation and surface structure of the film were characterized by water contact angle measurement, scanning electron microscopy (SEM), and x-ray photoelectron spectroscopy (XPS). The inhibition behavior of the complex film was investigated using Tafel polarization curves and electrochemical impedance spectroscopy (EIS) in 3.5 wt% sodium chloride (NaCl) solution. The electrochemical results show that the poly(dopamine)/MUA complex film improves greatly the corrosion resistance and interfacial adhesive force on copper substrate. The inhibition efficiency of the poly(dopamine)/MUA complex film increases to 97.7%.

scholarly journals Femtosecond Laser Produced Hydrophobic Hierarchical Structures on Additive Manufacturing Parts

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 601 ◽  
Author(s):  
Lishi Jiao ◽  
Zhong Chua ◽  
Seung Moon ◽  
Jie Song ◽  
Guijun Bi ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Photoelectron Spectroscopy ◽  
Hierarchical Structures ◽  
Hydrophobic Surface ◽  
Functional Surface ◽  
Sem Images ◽  
Water Contact ◽  
Fs Laser ◽  
Micro Structures

With the recent expansion of additive manufacturing (AM) in industries, there is an intense need to improve the surface quality of AM parts. A functional surface with extreme wettability would explore the application of AM in medical implants and microfluid. In this research, we propose to superimpose the femtosecond (fs) laser induced period surface structures (LIPSS) in the nanoscale onto AM part surfaces with the micro structures that are fabricated in the AM process. A hierarchical structure that has a similar morphology to a lotus leaf surface is obtained by combining the advantages of liquid assisting fs laser processing and AM. A water contact angle (WCA) of 150° is suggested so that a super hydrophobic surface is achieved. The scanning electron microscopy (SEM) images and X-ray photoelectron spectroscopy (XPS) analysis indicate that both hierarchical structures and higher carbon content in the laser processed area are responsible for the super hydrophobicity.

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