“…However, the characteristic peaks of GO cannot be observed in all XRD patterns because of the very small amount of GO incorporated in the composite . Whereas the Raman spectra of TiO 2 -rGO composite (Figure b) clearly showed the characteristic peaks of both anatase-TiO 2 and GO, in which the peaks at 145 (Eg(1)), 399 (B1g(1)), 637 (Eg(2)), and 516 cm –1 (A1g+B1g(2)) were attributed to the typical modes of anatase-TiO 2 , and the D-band and G-band of GO at 1349 and 1592 cm –1 shifted a little to 1356 and 1609 cm –1 in TiO 2 -rGO composite due to the interaction between TiO 2 and rGO . Moreover, the intensity ratio of D/G bonds increased a little from 0.86 to 0.88 in TiO 2 -rGO composites, indicating a decrease in the average size of the sp2 domains caused by the hydrothermal reduction. − To clarify the transition of GO to rGO during the hydrothermal process, we compared the XRD patterns (Figure S4a) and FTIR spectra (Figure S4b) of pristine GO before and after the hydrothermal process.…”
A 2D sandwich-like TiO-rGO composite was fabricated by the Pickering emulsion approach to improve the photocatalytic efficiency. Through an in situ growth of antase-TiO nanoparticles on the interface of O/W type GO Pickering emulsion, TiO nanoparticles were closely and densely packed on the surface of well-exfoliated rGO sheets; meanwhile, many mesoporous voids acting as the adsorption chamber and microreactor were produced. Evaluated by methylene blue (MB) degradation, its photocatalytic activity was prominent compared with the common TiO-based photocatalyst, with the rate constants 5 and 3.1 times higher under visible light and xenon lamp, respectively. When we applied it in the photocatalytic degradation of tetracycline hydrochloride (TCH, such as 10 ppm) under the visible light without adding any oxidants, the total removal efficiency was as high as 94% after 40 min. The mechanism of this good photocatalytic efficiency was illustrated by the scavenger trapping tests, which showed that this unique structure of TiO-rGO composite induced by the Pickering emulsion can significantly enhance the light absorption ability, accelerate the separation rate of electron-hole pairs, increase the adsorption capacity of organic pollutants, and hence improve the photocatalytic efficiency.
“…However, the characteristic peaks of GO cannot be observed in all XRD patterns because of the very small amount of GO incorporated in the composite . Whereas the Raman spectra of TiO 2 -rGO composite (Figure b) clearly showed the characteristic peaks of both anatase-TiO 2 and GO, in which the peaks at 145 (Eg(1)), 399 (B1g(1)), 637 (Eg(2)), and 516 cm –1 (A1g+B1g(2)) were attributed to the typical modes of anatase-TiO 2 , and the D-band and G-band of GO at 1349 and 1592 cm –1 shifted a little to 1356 and 1609 cm –1 in TiO 2 -rGO composite due to the interaction between TiO 2 and rGO . Moreover, the intensity ratio of D/G bonds increased a little from 0.86 to 0.88 in TiO 2 -rGO composites, indicating a decrease in the average size of the sp2 domains caused by the hydrothermal reduction. − To clarify the transition of GO to rGO during the hydrothermal process, we compared the XRD patterns (Figure S4a) and FTIR spectra (Figure S4b) of pristine GO before and after the hydrothermal process.…”
A 2D sandwich-like TiO-rGO composite was fabricated by the Pickering emulsion approach to improve the photocatalytic efficiency. Through an in situ growth of antase-TiO nanoparticles on the interface of O/W type GO Pickering emulsion, TiO nanoparticles were closely and densely packed on the surface of well-exfoliated rGO sheets; meanwhile, many mesoporous voids acting as the adsorption chamber and microreactor were produced. Evaluated by methylene blue (MB) degradation, its photocatalytic activity was prominent compared with the common TiO-based photocatalyst, with the rate constants 5 and 3.1 times higher under visible light and xenon lamp, respectively. When we applied it in the photocatalytic degradation of tetracycline hydrochloride (TCH, such as 10 ppm) under the visible light without adding any oxidants, the total removal efficiency was as high as 94% after 40 min. The mechanism of this good photocatalytic efficiency was illustrated by the scavenger trapping tests, which showed that this unique structure of TiO-rGO composite induced by the Pickering emulsion can significantly enhance the light absorption ability, accelerate the separation rate of electron-hole pairs, increase the adsorption capacity of organic pollutants, and hence improve the photocatalytic efficiency.
“…In addition, it has been proved that amorphous carbon materials could be obtained by calcining carbon sources consisting of C, H and O. 37 , 38 Based on this, we believed that the organic surfactant (Pluronic L64) resulted in the formation of amorphous carbon after calcination. Figure 4 ( A ) X-ray photoelectron spectroscopy (XPS) patterns and element contents of SLA, SLA-ZrP0.5 and SLA-ZrP0.7 samples; ( B ) split-fitting spectra of the Zr3d peaks in different groups.…”
Background
Sandblasted/acid-etched titanium (SLA-Ti) implants are widely used for dental implant restoration in edentulous patients. However, the poor osteoinductivity and the large amount of Ti particles/ions released due to friction or corrosion will affect its long-term success rate.
Purpose
Various zirconium hydrogen phosphate (ZrP) coatings were prepared on SLA-Ti surface to enhance its friction/corrosion resistance and osteoinduction.
Methods
The mixture of ZrCl
4
and H
3
PO
4
was first coated on SLA-Ti and then calcined at 450°C for 5 min to form ZrP coatings. In addition to a series of physiochemical characterization such as morphology, roughness, wettability, and chemical composition, their capability of anti-friction and anti-corrosion were further evaluated by friction-wear test and by potential scanning. The viability and osteogenic differentiation of MC3T3-E1 cells on different substrates were investigated via MTT, mineralization and PCR assays.
Results
The characterization results showed that there were no significant changes in the morphology, roughness and wettability of ZrP-modified samples (SLA-ZrP0.5 and SLA-ZrP0.7) compared with SLA group. The results of electrochemical corrosion displayed that both SLA-ZrP0.5 and SLA-ZrP0.7 (especially the latter) had better corrosion resistance than SLA in normal saline and serum-containing medium. SLA-ZrP0.7 also exhibited the best friction resistance and great potential to enhance the spreading, proliferation and osteogenic differentiation of MC3T3-E1 cells.
Conclusion
We determined that SLA-ZrP0.7 had excellent comprehensive properties including anti-corrosion, anti-friction and osteoinduction, which made it have a promising clinical application in dental implant restoration.
“…The Raman spectra of C–TiO 2 nanocomposites (Figure 1b) present the characteristic peaks of both anatase-TiO 2 and carbon, among which the peaks at 144 (E g(1) ), 393 (B 1g(1) ), 512 (A 1g + B 1g(2) ), and 633 cm –1 (E g(2) ) were attributed to the typical modes of anatase-TiO 2 , 5 and the D-band and G-band of carbon at 1321 and 1583 cm –1 shifted a little to 1334 and 1599 cm –1 in C–TiO 2 nanocomposites due to the interaction between TiO 2 and carbon. 39,44,45 In addition, the composition of the C–TiO 2 -2 and C−γ-Fe 2 O 3 /TiO 2 -2 nanocomposites was studied by energy-dispersive X-ray spectroscopy (EDS) analysis (Figures 1c and S1). The peaks showed that the C–TiO 2 -2 product was only composed of Ti, O, and C elements.…”
Section: Resultsmentioning
confidence: 99%
“…The diffraction peaks correspond to the (101), (004), (200), (105), (211), (204), and (116) planes of the tetragonal phase of anatase TiO 2 (JCPDS 21-1272), but there are no peaks belonging to rutile phase; the diffraction peaks of carbon are not observed in the complex, which may be due to the low carbon content and relatively low diffraction intensity. The Raman spectra of C–TiO 2 nanocomposites (Figure b) present the characteristic peaks of both anatase-TiO 2 and carbon, among which the peaks at 144 (E g(1) ), 393 (B 1g(1) ), 512 (A 1g + B 1g(2) ), and 633 cm –1 (E g(2) ) were attributed to the typical modes of anatase-TiO 2 , and the D-band and G-band of carbon at 1321 and 1583 cm –1 shifted a little to 1334 and 1599 cm –1 in C–TiO 2 nanocomposites due to the interaction between TiO 2 and carbon. ,, In addition, the composition of the C–TiO 2 -2 and C−γ-Fe 2 O 3 /TiO 2 -2 nanocomposites was studied by energy-dispersive X-ray spectroscopy (EDS) analysis (Figures c and S1). The peaks showed that the C–TiO 2 -2 product was only composed of Ti, O, and C elements.…”
Visible-lightdriven C–TiO2 nanocomposites
were
prepared via a simple calcination and acid etching process. The C–TiO2 nanocomposites were characterized by X-ray photoelectron
spectroscopy, Raman spectroscopy, X-ray diffraction, transmission
electron microscopy, and high-resolution TEM. The results showed that
TiO2 nanoparticles were combined with a porous carbon layer
through surface C–O groups, which facilitates the strong interface
interaction. The interface combination of nano-TiO2 and
carbon material increases the specific surface area of nano-TiO2, widens the range of light response, and improves the efficiency
of light-induced electron migration. The visible-light photocatalytic
activity of the prepared photocatalyst was evaluated by the decomposition
of tetracycline aqueous solution. Compared with that of pure TiO2, the photocatalytic activity of C–TiO2 nanocomposites
was significantly improved. Furthermore, a possible photocatalytic
mechanism was also tentatively proposed. This work can promote the
development of active photocatalysts under solar light for the photodegradation
of environmental pollutants.
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