Chemical composition and phase identification of sodium titanate nanostructures grown from titania by hydrothermal processing

Zárate, R. A.; Fuentes, S.; Wiff, Juan Paulo; Fuenzalida, V.M.; Cabrera, A. L.

doi:10.1016/j.jpcs.2007.02.011

Cited by 74 publications

(52 citation statements)

References 61 publications

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“…Unlike the other two methods, the H-E process may promote the formation of nano-mesh layer and thus specific peak was obtained in this case. The peak obtained around 300 cm ¹1 is similar to that of titanate nanowires, which was reported by Zerate et al and Gao et al 12,13) These results indicate that nano-mesh layer prepared by H-E process has a sodium-containing titanate phase.…”

Section: Methodssupporting

confidence: 83%

Solution Process for Synthesizing Bioactive Nano-Mesh Layer on Ti-Based Bulk Metallic Glasses

et al. 2013

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Ti based Bulk Metallic Glasses (BMGs) were treated by Hydrothermal (H), Electrochemical (E) and Hydrothermal-Electrochemical (H-E) processes in NaOH solution and all of these processes enabled fabrication of titanate nano-mesh structures on their surfaces. XPS data suggested that the amount of cytotoxic Cu was drastically decreased for the samples treated by H-E process. Specimens having nano-mesh structures on their surface were immersed in Simulated Body Fluid (SBF) for 12 days. The results of the SBF test supported the fact that nano-mesh structures fabricated by these three methods have bioactivity. However, only the specimen treated by H-E process exhibited very good adhesion performance between the induced hydroxyapatite layer and substrate with intermediated titanate nanomesh layer. These results indicated that the H-E process was the best among three to fabricate a low cytotoxic bioactive nano-mesh layer on Ti-based BMG which enabled to induce hydroxyapatite layer with strong adhesion.

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Section: Methodssupporting

confidence: 83%

Solution Process for Synthesizing Bioactive Nano-Mesh Layer on Ti-Based Bulk Metallic Glasses

et al. 2013

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“…After treatment with 10 M NaOH, the diffractograms exhibited sharp diffraction lines of rutile and of hydrated phase (T), but not from anatase (Figure 4b). In this case, the hydrated phase exhibited diffraction lines as intense as the rutile phase, which indicates that the cylindrical-like structures have higher cristallinity than the sheet-like structures obtained at 5 M. Contrarily to our case, it is well known in literature that the as-synthesized nanostructures, grown by hydrothermal processes and using anatase as precursor, exhibit XRD patterns with very low intensity diffraction lines [5][6]17].…”

Section: Structural Analysis Xrdsupporting

confidence: 67%

Characterization of Hydrated Titanium Oxide With Sheet-Like and Tube-Like Structures Prepared by a Hydrothermal Processing

Fuentes

Zárate

Espinoza

et al. 2011

J. Chil. Chem. Soc.

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Hydrated titanium oxides structures have been synthesized successfully from rutile by a single-step hydrothermal process at 130 ºC in NaOH at concentrations of 5 M and 10 M, monitoring up to two days. Field emission scanning electron microscopy (FEG-SEM) and transmission electron microscopy (TEM) images indicate that samples treated at 5M were composed of sheet-like structures, while nanotubes were mainly found at 10 M. XRD analysis for both concentrations indicated presence of two phases, hydrated titanium oxide not indexed yet and rutile. Besides, X-ray diffraction (XRD) patterns of the samples treated at 10 M exhibited high reflections from the nanostructures, i.e., they possess high crystallinity. Thermogravimetry Analysis (TGA) indicated that the nanostructures show crystallized water in their matrix, specifically it was found that this hydrated phase has half molecule of occluded water per unit cell. This result is consistent with Raman spectroscopy that corroborates the existence of crystallization water in the synthesized product, by a deep profile of hydrated titanium oxide.

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“…S1). The XRD analysis on the crystal structure of sodium titanate NW arrays used as precursors showed a majority of the peaks to match with sodium hexatitanate (Na 2 Ti 6 O 13 ) (JCPDS 31-1329) and some with sodium trititanate (Na 2 Ti 3 O 7 ) (JCPDS 73-1398) 45,46 . The crystal structure and lattice parameter of individual NWs were studied using HRTEM and demonstrated the transformation from single-crystal sodium titanate NW precursor to single-crystal BaTiO 3 NWs upon Ba 2 þ ion exchange.…”

Section: Methodsmentioning

confidence: 99%

High-sensitivity accelerometer composed of ultra-long vertically aligned barium titanate nanowire arrays

2013

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A configuration that shows great promise in sensing applications is vertically aligned piezoelectric nanowire arrays that allow facile interfacing with electrical interconnects. Nanoelectromechanical systems developed using piezoelectric nanowires have gained interest primarily for their potential in energy harvesting applications, because they are able to convert several different sources of mechanical energy into useful electrical power. To date, no results have demonstrated the capability to use aligned piezoelectric nanowire arrays as a highly accurate nano-electromechanical system based dynamic sensor with a wide operating bandwidth and unity coherence. Here we report the growth of vertically aligned (B45 mm long) barium titanate nanowire arrays, realized through a two-step hydrothermal synthesis approach, and demonstrate their use as an accurate accelerometer. High sensitivity of up to 50 mVg À 1 is observed from the sensor composed of vertically aligned barium titanate nanowire arrays, thus providing performance comparable to many of the commercial accelerometer systems.

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Chemical composition and phase identification of sodium titanate nanostructures grown from titania by hydrothermal processing

Cited by 74 publications

References 61 publications

Solution Process for Synthesizing Bioactive Nano-Mesh Layer on Ti-Based Bulk Metallic Glasses

Solution Process for Synthesizing Bioactive Nano-Mesh Layer on Ti-Based Bulk Metallic Glasses

Characterization of Hydrated Titanium Oxide With Sheet-Like and Tube-Like Structures Prepared by a Hydrothermal Processing

High-sensitivity accelerometer composed of ultra-long vertically aligned barium titanate nanowire arrays

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