The Effect of Titanium Dioxide (TiO2) Nanoparticles on Hydroxyapatite (HA)/TiO2 Composite Coating Fabricated by Electrophoretic Deposition (EPD)

In order to meet the requirements of high corrosion resistance, wear resistance, and self-lubrication of composite coatings for marine applications, epoxy matrix composite coatings containing PTFE and TiO2 nanoparticles were prepared on the steel substrate. With silane coupling agent KH570 (CH2=C(CH3)COOC3H6Si(OCH3)3), titanium dioxide nanoparticles were modified, and organic functional groups were grafted on their surface to improve their dispersion and interface compatibility in the epoxy matrix. Then, the section morphology, tribological, and anticorrosion properties of prepared coatings, including pure epoxy, epoxy–PTFE, and the composite coating with unmodified and modified TiO2, respectively, were fully characterized by scanning electron microscopy, friction–abrasion testing machine, and an electrochemical workstation. The analytical results show that the modified TiO2 nanoparticles are able to improve the epoxy–PTFE composite coating’s mechanical properties of epoxy–PTFE composite coating including section toughness, hardness, and binding force. With the synergistic action of the friction reduction of PTFE and dispersion enhancement of TiO2 nanoparticles, the dry friction coefficient decreases by more than 73%. Simultaneously, modified titanium dioxide will not have much influence on the water contact angles of the coating. A larger water contact angle and uniform and compact microstructure make the composite coating incorporated modified TiO2 nanoparticles show excellent anti-corrosion ability, which has the minimum corrosion current density of 1.688 × 10−7 A·cm−2.

Download Full-text

Preparation of silver-titanium dioxide core-shell (Ag@TiO2) nanoparticles: Effect of Ti-Ag mole ratio

Procedia Engineering ◽

10.1016/j.proeng.2012.01.1322 ◽

2012 ◽

Vol 32 ◽

pp. 649-655 ◽

Cited By ~ 32

Author(s):

S. Angkaew ◽

P. Limsuwan

Keyword(s):

Titanium Dioxide ◽

Tio2 Nanoparticles ◽

Core Shell

Download Full-text

Electrophoretic Deposition of CdSe Nanocrystals for Photovoltaic Applications

MRS Proceedings ◽

10.1557/proc-1031-h13-25 ◽

2007 ◽

Vol 1031 ◽

Author(s):

Nathanael Smith ◽

Kevin J Emmett ◽

Sandra J Rosenthal

Keyword(s):

Titanium Dioxide ◽

Electrophoretic Deposition ◽

Room Temperature ◽

Tio2 Thin Film ◽

Cdse Nanocrystals ◽

Photovoltaic Devices ◽

Photovoltaic Applications ◽

Nanocrystalline Titanium ◽

Alternative Techniques

AbstractCdSe nanocrystals chemically linked to nanocrystalline titanium dioxide substrates form a promising material for nanostructured photovoltaic devices. The usual method for attaching the nanocrystals to the titanium dioxide substrate is by means of a linking molecule (such as mercaptopropionic acid) or in-situ growth. In this paper, we report the use of an alternative technique, electrophoretic deposition (EPD), to directly deposit already formed CdSe nanocrystals onto the substrate. In EPD, a voltage is established between two electrodes that are immersed in a solution of nanocrystals. At room temperature, a fraction of the nanocrystals are thermally charged, and these charged nanocrystals migrate to the electrodes and adhere to the surface. A significant advantage of EPD over the use of linking molecules is the speed with which the nanocrystals are deposited: EPD takes only a few minutes, compared to the several hours required for the alternative techniques. Additionally, we have fabricated initial photovoltaic devices based on electrophoretically deposited CdSe nanocrystals on a planar TiO2 thin film.

Download Full-text

Responses of metabolic enzymes (GOT, GPT and LDH) in an Indian major carp Cirrhinus mrigala exposed to titanium dioxide (TiO2 ) nanorods under short-term exposure

Ecotoxicology and Environmental contamination ◽

10.5132/eec.2020.01.09 ◽

2020 ◽

Vol 15 ◽

pp. 69-78

Author(s):

B. Rangasamy ◽

A.P. Ashokan ◽

M. Ramesh ◽

A. Narayanasamy

Keyword(s):

Titanium Dioxide ◽

Tio2 Nanoparticles ◽

Aquatic Organisms ◽

Tio2 Nanorods ◽

Freshwater Ecosystem ◽

X Ray Diffraction ◽

Short Term ◽

Indian Major Carp ◽

Cirrhinus Mrigala ◽

Short Term Exposure

Titanium dioxide (TiO2) nanoparticles are extensively manufactured due to their potential properties and applications invarious fields such as biomedical, electrical and environmental. These particles are likely to reach the aquatic environmentand may cause adverse effects on aquatic organisms. In this study, we investigated the effects of different concentrations (1, 50 and 100 mg L-l) of TiO2 nanorods (NRs). The enzymatic activity of glutamate oxaloacetate transaminase (GOT), glutamate pyruvate transaminase (GPT), and lactate dehydrogenase (LDH) was measured in the liver and muscle of an Indian major carp, Cirrhinus mrigala, under short-term exposure (96 h). The synthesised particles were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), UV-Visspectroscopy (UV-Vis) and photoluminescence (PL) techniques before conducting the toxicity assay. The GOT and GPT activities were significantly elevated in both liver and muscle of fish treated with TiO2 nanorods (except 50 mg L-l in muscle for GPT). Similarly, the activity of LDH was also found to be elevated. The findings of the present investigation suggest that TiO2:NRs might have be absorbed, circulated, accumulated in liver and muscles of C. mrigala resulting in alterations in the enzyme activities. The results revealed that TiO2 nanorods induced alterations in GOT, GPT and LDH activities of fish at tested concentrations. The alterations of these enzymatic parameters can be useful for monitoring the environmental contamination of titanium dioxide (TiO2) nanoparticles in freshwater ecosystem.

Download Full-text