Visualization of local electrochemical activity and local nickel ion release on laser-welded NiTi/steel joints using combined alternating current mode and stripping mode SECM

The Analyst ◽  
2008 ◽  
Vol 133 (12) ◽  
pp. 1700 ◽  
Author(s):  
D. Ruhlig ◽  
H. Gugel ◽  
A. Schulte ◽  
W. Theisen ◽  
W. Schuhmann
Keyword(s):  
Current Mode ◽  
Alternating Current ◽  
Electrochemical Activity ◽  
Ion Release ◽  
Nickel Ion ◽  
Steel Joints

STUDY OF NICKEL ION RELEASE IN SIMULATED BODY FLUID FROM C+-IMPLANTED NICKEL TITANIUM ALLOY

2016 ◽  
Vol 23 (05) ◽  
pp. 1650045 ◽  
Author(s):  
MUHAMMAD AHSAN SHAFIQUE ◽  
G. MURTAZA ◽  
SHAHZAD SAADAT ◽  
ZEESHAN ZAHEER ◽  
MUHAMMAD SHAHNAWAZ ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Niti Alloy ◽  
Niti Shape Memory Alloy ◽  
Ion Release ◽  
Nickel Ion ◽  
Oxidation Layer ◽  
X Ray ◽  
Calcium Phosphate Precipitation

Nickel ion release from NiTi shape memory alloy is an issue for biomedical applications. This study was planned to study the effect of C[Formula: see text] implantation on nickel ion release and affinity of calcium phosphate precipitation on NiTi alloy. Four annealed samples are chosen for the present study; three samples with oxidation layer and the fourth without oxidation layer. X-ray diffraction (XRD) spectra reveal amorphization with ion implantation. Proton-induced X-ray emission (PIXE) result shows insignificant increase in Ni release in simulated body fluid (SBF) and calcium phosphate precipitation up to [Formula: see text][Formula: see text]ions/cm2. Then Nickel contents show a sharp increase for greater ion doses. Corrosion potential decreases by increasing the dose but all the samples passivate after the same interval of time and at the same level of [Formula: see text] in ringer lactate solution. Hardness of samples initially increases at greater rate (up to [Formula: see text][Formula: see text]ions/cm[Formula: see text] and then increases with lesser rate. It is found that [Formula: see text][Formula: see text]ions/cm2 ([Formula: see text] is a safer limit of implantation on NiTi alloy, this limit gives us lesser ion release, better hardness and reasonable hydroxyapatite incubation affinity.

Influence of nickel ion release on leukocyte activation: a study with coated and non-coated NiTi shape memory alloys

2008 ◽  
Vol 481-482 ◽  
pp. 612-615 ◽  
Author(s):  
S.A. Esenwein ◽  
D. Bogdanski ◽  
T. Habijan ◽  
M. Pohl ◽  
M. Epple ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Leukocyte Activation ◽  
Ion Release ◽  
Nickel Ion ◽  
Niti Shape Memory Alloys

Bioinspired Superhydrophobic Ni–Ti Archwires with Resistance to Bacterial Adhesion and Nickel Ion Release

2019 ◽  
Vol 6 (7) ◽  
pp. 1801569 ◽  
Author(s):  
Ruoxi Liu ◽  
Xi Liu ◽  
Jie Zhou ◽  
Qiong Nie ◽  
Jingxin Meng ◽  
...  
Keyword(s):  
Bacterial Adhesion ◽  
Ion Release ◽  
Nickel Ion

scholarly journals New Bactericide Orthodonthic Archwire: NiTi with Silver Nanoparticles

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 702
Author(s):  
F. Javier Gil ◽  
Eduardo Espinar-Escalona ◽  
Nuria Clusellas ◽  
Javier Fernandez-Bozal ◽  
Montserrat Artes-Ribas ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Martensitic Transformation ◽  
Inductively Coupled Plasma ◽  
Artificial Saliva ◽  
Bacterial Strains ◽  
Ion Release ◽  
Critical Temperatures ◽  
Nickel Ion ◽  
Bacteria Culture ◽  
Nanoparticles Of Silver

A potential new bactericide treatment for NiTi orthodontic archwires based in the electrodeposition of silver nanoparticles on the surface was studied. Twenty-five archwires were treated by electrodeposition, obtaining nanoparticles of silver embedded on the archwire surface. These were evaluated in order to investigate the possible changes on the superelastic characteristics (critical temperatures and stresses), the nickel ion release, and the bacteria culture behavior. The chemical composition was analyzed by Energy Dispersive X-Ray Spectroscopy-microanalysis; the singular temperatures of the martensitic transformation were obtained by a flow calorimeter. Induced martensitic transformation stresses were obtained by mechanical testing apparatus. Nickel ion release was analyzed by inductively coupled plasma-mass spectrometry (ICP-MS) equipment using artificial saliva solution at 37 °C. Bacterial tests were studied with the most used oral bacterial strains: Streptococcus sanguinis and Lactobacillus salivarius. NiTi samples were immersed in bacterial suspensions for 2 h at 37 °C. Adhered bacteria were separated and seeded on agar plates: Tood-Hewitt (TH) and Man-Rogosa-Sharpe (MRS) for S. sanguinis and for L.salivarius, respectively. These were then incubated at 37 °C for 1 day and the colonies were analyzed. The results showed that the transformation temperatures and the critical stresses have not statistically significant differences. Likewise, nickel ion release at different immersion times in saliva at 37 °C does not present changes between the original and treated with silver nanoparticles archwires. Bacteria culture results showed that the reduction of the bacteria due to the presence to the nanoparticles of silver is higher than 90%. Consequently, the new treatment with nanoparticles of silver could be a good candidate as bactericidic orthodontic archwire.

Polymeric nanoparticles-based multi-functional coatings on NiTi alloy with nickel ion release control, cytocompatibility, and antibacterial performance

2019 ◽  
Vol 43 (3) ◽  
pp. 1551-1561 ◽  
Author(s):  
Long Meng ◽  
Yunan Wu ◽  
Kai Pan ◽  
Ye Zhu ◽  
Xiaojie Li ◽  
...  
Keyword(s):  
Polymeric Nanoparticles ◽  
Niti Alloy ◽  
Antibacterial Properties ◽  
Functional Coatings ◽  
Ion Release ◽  
Nickel Ion ◽  
Antibacterial Performance ◽  
Release Control

Photo-cross-linked quaternized copolymer coatings on NiTi alloy show prominent inhibition of nickel ion release and antibacterial properties.

The Alternating Current Scanning Electrochemical Microscopy Characterization of Diatom Cell Activity Affected by Paeonol

2014 ◽  
Vol 707 ◽  
pp. 113-116 ◽  
Author(s):  
Shou Huan Zhao ◽  
Ji Yong Zheng ◽  
Jing Ya Yang ◽  
Cun Guo Lin ◽  
Wei Wang ◽  
...  
Keyword(s):  
Cell Activity ◽  
Scanning Electrochemical Microscopy ◽  
Alternating Current ◽  
Electrochemical Activity ◽  
Chemical Stimulus ◽  
Cellular Activity ◽  
High Frequencies ◽  
Microscopy Characterization ◽  
Electrochemical Microscopy

The alternating current scanning electrochemical microscopy (AC-SECM) is an important method to characterize the electrochemical activity of living cells. In this paper, we apply AC-SECM to measure the electrochemical activity of diatom biofilm. We find that the diatom biofilm presents insulating effect to decrease the current, when the electrode is close to the biofilm. The alternating current impedance of diatom biofilm is overall smaller than that of the bare glass. To investigate the possible effect of chemical stimulus on cellular activity, the diatoms were immersed into paeonol solution (100 μg/mL), and AC-SECM imaging experiments were conducted when immersion time reached 20 h, 25 h and 35 h. The AC measurements performed at high frequencies show that phase angle decreases over time, which preliminarily indicates that the cellular activity of diatoms is affected by paeonol.

scholarly journals Nickel ion release from dental alloys in two different mouthwashes

2019 ◽  
Vol 13 (1) ◽  
pp. 19-23 ◽  
Author(s):  
Karim Jafari ◽  
Saeed Rahimzadeh ◽  
Somayeh Hekmatfar
Keyword(s):  
Inductively Coupled Plasma ◽  
Control Group ◽  
Distilled Water ◽  
Dental Alloys ◽  
Ion Release ◽  
Nickel Ion ◽  
Inductively Coupled ◽  
Nickel Chromium ◽  
Significant Difference ◽  
History Of

Background. Mouthwashes are widely used as adjuncts to mechanical oral hygiene procedures. Nonetheless, there is little information regarding the effect of various mouthwashes on the amount of ions released from the nickel-chromium (Ni‒Cr) alloys used in the fabrication of fixed prostheses. Therefore, the present study was conducted to evaluate the effect of two types of mouthwash on the release of Ni ions from dental alloys. Methods. Forty-two disk-shaped specimens were prepared with a diameter of 10 mm and a height of 2 mm. Two mouthwashes were examined in this study: Oral B and Listerine. A control group was also considered using distilled water. Each Ni‒Cr disk was immersed in the mouthwashes and distilled water in polypropylene test tubes, and then incubated at 37°C to simulate the oral temperature. After 45 days of incubation, the samples were tested for Ni ions using inductively coupled plasma mass spectroscopy. Data were analyzed using ANOVA. Results. In the Halita group subjects exhibited 2.04±0.65 reduction in OLS. OLS reduction in the chlorhexidine group was 1.95±0.74. Statistical analysis showed no significant difference between the two groups (P>0.05). Conclusion. As the results indicated, the amount of ion release was within the safe limits in the two experimental groups. However, it is recommended that prescribe Listerine mouthwash should not be prescribed for the patients with a history of Ni allergy.

Sign in / Sign up

Export Citation Format

Share Document