Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Electroplating”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 415 records · Page 23Linked to original sources
PubMed2006

Behavior of human osteoblast-like cells in contact with electrodeposited calcium phosphate coatings.

Calcium-deficient hydroxyapatite (Ca-def-HAP) thin films were elaborated on Ti6Al4V substrates by electrodeposition. The coatings exhibit two different morphologies and crystallinities. Human osteoblast-like cells (MG-63) were cultured on the surfaces of these materials; the cell content and viability were evaluated up to 28 days. The scanning electron microscopy and biological investigations showed cells with a normal morphology, good proliferation, and viability from 7 to 21 days. But after 28 days, the number of live cells decreases in both cases; however, this decrease is less important in the case of calcium phosphate (CaP) coating surface when compared with the control (cell culture plastic). The cells cultured on Ca-def-HAP coating exhibit more cellular extensions and extracellular matrix. RT-PCR for type I collagen, alkaline phosphatase, and osteocalcin studies were also carried out, and was found that the CaP enhances gene expression of ALP and OC and thus the differentiation of osteoblast-like cells. Moreover, this study shows that the difference in the morphology of CaP coatings has no effect on the biocompatibility.

Calcium Phosphates↗
PubMed1988

Renal function of chrome-plating workers and welders.

The influence of occupational exposure to water-soluble chromium (VI) on renal function was examined. In male chrome-plating workers (n = 29), stainless steel welders (n = 45), boilermakers (n = 18) and a control group of workers (n = 71), the level of chromium in the urine (Cr-U), the chromium clearance, and sensitive renal function parameters were determined. The glomerular-function parameters of the chrome-plating workers (Cr-U 1 to 34 micrograms/g creat) and welders (Cr-U 1 to 62 micrograms/g creatine) appeared to differ from those of the boilermakers (Cr-U 0.3 to 1.5 micrograms/g creatine) and controls (Cr-U 0.1 to 2 micrograms/g creatine). The renal function parameters were not related to chromium concentration in the urine or to chromium clearance.

Adult↗
PubMed2002

ETAAS determination of nickel in serum and urine.

Methods for the direct determination of Ni in human blood serum and urine by electrothermal atomic absorption spectrometry (ETAAS) are described. Hydrogen peroxide was proposed as matrix modifier, assisting thermal decomposition of proteins during the ashing step. A pyrolysis temperature of 1,200 degrees C was found to be optimal while 2,100 degrees C and 2,200 degrees C were found to be optimal atomizing temperatures for Ni in serum and urine respectively. Calibration was performed by using a calibration curve prepared with aqueous standard solutions of Ni (glycine must be used as modifier for Ni in aqueous solutions). The limits of detection, defined as the blank values plus 3 times the standard deviation of the blank values, were 0.2 microg/L for both serum and urine samples. Relative standard deviations for serum samples with concentrations of Ni in the range 0.5-2 microg/L were 10-15% and for urine samples with Ni concentrations in the range 0.5-2.5 microg/L were 8-10%.

Calibration↗
PubMed2006

Occupational asthma due to chromium and nickel salts.

BACKGROUND: Exposure to chromium and nickel salts is a poorly characterized cause of occupational asthma. METHODS: We describe four patients with work-related asthma due to metallic salts. Skin-prick tests to potassium dichromate and nickel sulfate were performed. The patients underwent methacholine inhalation tests and specific inhalation challenges (SIC) with both chromium and nickel salts. RESULTS: Two patients showed positive skin-prick tests to potassium dichromate and nickel sulfate. All patients had bronchial hyperresponsiveness to methacholine, which increased 24 h after SIC with metallic salts. SIC with potassium dichromate elicited late asthmatic reactions (LAR) in two workers, one subject had an early asthmatic reaction (EAR), and another subject showed a dual asthmatic reaction (DAR). SIC with nickel sulfate induced a DAR in one subject and a late asthmatic reaction in another. CONCLUSIONS: Chromium and nickel salts can give rise to occupational asthma in exposed workers. The underlying mechanism may be IgE-mediated in some cases.

Adult↗
PubMed2006

A new antibody immobilization strategy based on electro-deposition of gold nanoparticles and Prussian Blue for label-free amperometric immunosensor.

A novel and sensitive immunosensor has been developed by electro-depositing gold nanoparticles on to a Prussian Blue-modified glassy carbon electrode for determination of hepatitis B surface antigen (HBsAg). After the developed immunosensor was incubated with different concentrations of HBsAg samples at 37 degrees C for 15 min, the current response decreased with an increasing HBsAg concentration in the sample solution. The decreased percentage of the current was proportional to HBsAg concentration ranging from 2 to 300 ng HbsAg ml(-1) with a detection limit of 0.42 ng HbsAg ml(-1) (S/N = 3). Analytical results of 50 specimens using the developed immunosensor showed satisfactory agreement with those using ELISA, indicating the method to be a promising alternative for detecting HBsAg in clinical diagnosis.

Antibodies↗
PubMed2005

Characterization and bond strength of electrolytic HA/TiO2 double layers for orthopaedic applications.

Insufficient bonding of juxtaposed bone to an orthopaedic/dental implant could be caused by material surface properties that do not support new bone growth. For this reason, fabrication of biomaterials surface properties, which support osteointegration, should be one of the key objectives in the design of the next generation of orthopaedic/dental implants. Titanium and titanium alloy have been widely used in several bioimplant applications, but when implanted into the human body, these still contain some disadvantages, such as poor osteointegration (forming a fibrous capsule), wear debris and metal ion release, which often lead to clinical failure. Electrolytic hydroxyapatite/titanium dioxide (HA/TiO2) double layers were successfully deposited on titanium substrates in TiCl4 solution and subsequently in the mixed solution of Ca(NO3)2 and NH4H2PO4, respectively. After annealing at 300 degrees C for 1 h in the air, the coated specimens were evaluated by dynamic cyclic polarization tests, immersion tests, tensile tests, surface morphology observations, XRD analyses and cells culture. The adhesion strength of the HA coating were improved by the intermediate coating of TiO2 from 11.3 to 46.7 MPa. From cell culture and immersion test results, the HA/TiO2 coated specimens promoted not only cells differentiation, but also appeared more bioactive while maintaining non-toxicity.

Adhesiveness↗
PubMed2005

Hydroxyapatite-coated metals: interfacial reactions during sintering.

Electrophoretic deposition (EPD) is a low cost flexible process for producing HA coatings on metal implants. Its main limitation is that it requires heating the coated implant in order to densify the HA. HA typically sinters at a temperature below 1150 degrees C, but metal implants are degraded above 1000 degrees C. Further, the metal induces the decomposition of the HA coating upon sintering. Recent developments have enabled EPD of metathesis-synthesised uncalcined HA which sinters at approximately 1000 degrees C. The effects of temperature on HA-coated Ti, Ti6Al4V, and 316L stainless steel were investigated for dual coatings of metathesis HA sintered at 1000 degrees C. The use of dual HA coatings (coat, sinter, coat, sinter) enabled decomposition to be confined to the "undercoat" (HA layer 1), with the surface coating decomposition free. The tensile strength of the three metals was not significantly affected by the high sintering temperatures (925 degrees C < T < 1000 degrees C). XRD/SEM/EDS analyses of the interfacial zones revealed that 316L had a negligible HA:metal interfacial zone (approximately 1 microm) while HA:Ti and HA:Ti6Al4V had large interfacial zones (>10 microm) comprising a TiO2 oxidation zone and a CaTiO2 reaction zone.

Alloys↗
PubMed2005

Preparation and characterization of an electrodeposited calcium phosphate coating associated with a calcium alginate matrix.

A new way of optimizing osteoconduction of biomaterials is to bring to them biological properties. In this work, we associated a novel release system with an electrodeposited calcium phosphate (CaP) coated titanium alloy Ti6Al4V. The characterization of this material was performed by means of light microscopy, scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM) and X-ray energy dispersive spectroscopy (EDXS). The electrodeposited CaP coating was a tricalcium phosphate, and the release system was composed of microcapsules entrapped in an alginate film. We observed that the alginate matrix had a close contact with the coating. An intermediate layer containing calcium and phosphorus appeared at the interface between the alginate matrix and the CaP coating. These results allowed us to conclude that the association of two techniques, i.e. electrodeposition followed by deposition of a calcium alginate matrix, led to the elaboration of a new biomaterial.

Alginates↗
PubMed1987

Effect of electrodeposition of gold on porcelain-to-metal bond strength.

The effect of electrodeposition of two different thicknesses of gold on porcelain-metal bond strength with three different base metal alloys was determined and compared to a control high gold alloy. The following conclusions can be drawn. Mean porcelain-metal bond strengths of all four alloys were in the same range when conventional porcelain application techniques were used. However, the base metal porcelain-metal bond is clinically suspect because of adhesive failure through the porcelain-metal interface. A thin 180A gold coat increased the porcelain-metal bond strength and generally resulted in cohesive failure through the porcelain. A thicker gold coat (720A) decreased the bond strength and generally resulted in adhesive failure. The mechanism of action of the gold coat on bond strength is likely its effect on the oxide layer on the surface of the base metal alloy.

Chemical Phenomena↗