Crystal Structure of TiO2 Nanotube Arrays Anodized at Different Voltage for Cell-Metal Interaction

2017 ◽  
Vol 888 ◽  
pp. 262-266 ◽  
Author(s):  
Roshasnorlyza Hazan ◽  
Srimala Sreekantan ◽  
Ishak Mat
Keyword(s):  
Crystal Structure ◽  
Crystallite Size ◽  
Anatase Phase ◽  
Average Crystallite Size ◽  
Cell Interaction ◽  
Nanotube Arrays ◽  
Direct Control ◽  
Applied Potential ◽  
Cell Behaviors ◽  
Vertically Aligned

In recent study, vertically aligned TiO2 nanotubes have become the primary candidates that can provide direct control of many type cell behaviors and its functionality. TiO2 nanotubes were successfully developed within 10 V to 40 V of applied potential. The intensity of peaks (101) increases with increasing voltage up to 40 V, indicating an improvement in degree of crystalinity. The average crystallite size of the samples anodized at 10 V is about 19.65 nm and increase to 30.88 nm at 40 V. PA6 cell interaction were high on 40 V sample (110 nm-diameter) TiO2 nanotubes . It was found that anatase phase with appropriate diameter are believed to affect the growth of cells.

Corroboration of Structural Properties of Dy2O3-TiO2 Nanocomposites through X-Ray Diffraction and Raman Spectroscopy

2017 ◽  
Vol 17 ◽  
pp. 127-130
Author(s):  
J. Dhanalakshmi ◽  
D. Pathinettam Padiyan
Keyword(s):  
Raman Spectroscopy ◽  
Crystallite Size ◽  
Structural Properties ◽  
Oxygen Vacancies ◽  
Raman Band ◽  
Anatase Phase ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
X Ray ◽  
Weight Percentage

Dy2O3-TiO2 nanocomposites with different weight percentage (0, 2, 4, 8 & 10)Dy were synthesized bysol-gel method and named as 0DT, 2DT, 4DT, 6DT, 8DT and 10DT. The structural properties of these nanocomposites are characterized by X-ray diffraction (XRD) and Raman spectroscopy. XRD results show that Dy2O3-TiO2 nanocomposites have anatase phase with tetragonal structure. The average crystallite size of the Dy2O3-TiO2 nanocomposites lies between 10 to 18 nm.Coupling of Dy with TiO2 shifts the Raman band to higher wavenumber side indicating the creation of oxygen vacancies in the TiO2 lattice.

scholarly journals Determination of the crystallite size and crystal structure of magnesium powder by x-ray diffraction

2020 ◽  
Vol 20 (3) ◽  
pp. 61-65
Author(s):  
ISMAIL ISMAIL ◽  
RESI MULIANI ◽  
ZULFALINA ZULFALINA ◽  
SITI HAJAR SHEIKH MD FADZULLAH
Keyword(s):  
Crystal Structure ◽  
Crystallite Size ◽  
Rietveld Method ◽  
Average Crystallite Size ◽  
Powder Sample ◽  
X Ray Diffraction ◽  
Magnesium Powder ◽  
X Ray ◽  
Lattice Constants ◽  
Packed Structure

Magnesium powder has become an important material in the development of science and technology such as alloy and hydrogen storage. In this work, the chemical composition, crystallite size, and crystal structure of the magnesium powder sample have been studied by using x-ray fluorescent and x-ray diffraction. The x-ray diffraction data of the magnesium powder sample was analyzed by using the Rietveld method to obtain the crystal structure. Our results show that the purity of our magnesium powder sample is 93.1%. Our sample has good crystallinity with the average crystallite size of 31 nm. The crystal structure is found to be a hexagonal closed-packed structure with the lattice constants of 3.2100 Å (a and b-axis) and 5.2107 Å (c-axis). Our result revealed that the lattice constant in the c-axis of magnesium powder is influenced by impurity. This finding suggests that the impurity can affect the crystal structure of a material in general.

STRUCTURAL TRANSITION OF NANOCRYSTALLINE TiO2

2011 ◽  
Vol 10 (01n02) ◽  
pp. 59-63 ◽  
Author(s):  
MANORANJAN KAR ◽  
N. RAMA KRISHNAN ◽  
INDRAJIT TALUKDAR ◽  
K. ACHARYYA
Keyword(s):  
Crystallite Size ◽  
Bulk Material ◽  
Anatase Phase ◽  
Average Crystallite Size ◽  
Rutile Phase ◽  
High Energy ◽  
Nanocrystalline Tio2 ◽  
High Energy Ball Mill ◽  
Energy Ball ◽  
Xrd Patterns

Nanocrystalline TiO 2 sample was prepared by high-energy ball mill method. A known quantity of anatase phase- TiO 2 was milled for 83 h in air. The samples were collected at intervals of 5 h of milling. The XRD patterns were recorded for all the samples. The crystal structure changed from anatase phase for bulk material to rutile-rich phase for nanocrystalline material. Nanocrystalline TiO 2, which is a mixture of anatase, rutile, and srilankite phase, was prepared by milling for 60 h. The XRD pattern of unmilled anatase phase of TiO 2 could be refined with I41/amd space group. The crystallite size of the TiO 2 was found to decrease with milling time upto 50 h and then the size of rutile phase increases while the sizes of anatase and srilankite phases remain constant upto 60 h of milling. After 60 h, the sizes of all the phases remain constant. The average crystallite size for rutile phase is found to be 12 nm after 60 h of milling.

scholarly journals Synthesis and Characterization of Ce3+-Doped Ni0.5Cd0.5Fe2O4 Nanoparticles by Sol–Gel Auto-Combustion Method

Coatings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1156
Author(s):  
Danyal Ahmad ◽  
Nasir Mehboob ◽  
Abid Zaman ◽  
Nabeel Ahmed ◽  
Kashif Ahmed ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Crystallite Size ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
Xrd Analysis ◽  
Sem Images ◽  
X Ray ◽  
Auto Combustion ◽  
Ray Density

Cerium (Ce)-doped Ni0.5Cd0.5CexFe2−xO4 (0.0 ≤ x ≤ 0.20) was synthesized using the sol–gel auto-combustion method. X-ray diffraction (XRD) analysis revealed that all the samples retained spinel cubic crystal structure with space group Fd3m at 800 °C. Crystal structure parameters, such as lattice constant, average crystallite size, and X-ray density were estimated from the major XRD (311) peak. Bulk density and porosity were also calculated. The average crystallite size was estimated to be in the range of 20–24 nm. SEM images displayed agglomerated particles with a porous morphology. The dielectric constant (ε′) increased and the dielectric loss tangent (tanδ) decreased with rising Ce concentration. The hysteresis loop (M–H loop) was measured at room temperature using a vibrating-sample magnetometer (VSM), which showed a nonlinear decrease in magnetization and coercivity with increasing Ce concentration.

scholarly journals Оптические и структурные свойства нанопленок палладия в атмосфере водорода

2021 ◽  
Vol 129 (9) ◽  
pp. 1183
Author(s):  
В.А. Шутаев ◽  
В.А. Матвеев ◽  
Е.А. Гребенщикова ◽  
В.Г. Щелоков ◽  
Ю.П. Яковлев
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Optical Properties ◽  
Crystallite Size ◽  
Average Crystallite Size ◽  
Hydrogen Sensor ◽  
Optical Transparency ◽  
Radiation Wavelength ◽  
Practical Application ◽  
Thermal Vacuum

The crystal structure and optical properties of thermal-vacuum deposited palladium nanolayers at the thickness range of 10-130 nm was studied. It was found that Pd nanolayers are polycrystalline and the value of an average crystallite size depends on the layer thickness. The optical transparency of Pd nanolayers was investigated on the radiation wavelength about 0.95 μm in air and in hydrogen medium (100 vol.%). It was experimentally found that both in air and in hydrogen medium the optical transparency of Pd nanolayers in the thickness range of 10-45 nm obeys the Bouger law. The thickness range of Pd thin films suitable for practical application in hydrogen sensor was determined.

scholarly journals Photocatalytic Properties of Size-Controlled Titania Nanotube Arrays

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Takeshi Hashishin ◽  
Keisuke Misawa ◽  
Kazuo Kojima ◽  
Chihiro Yogi ◽  
Jun Tamaki
Keyword(s):  
Crystallite Size ◽  
Rate Constant ◽  
Apparent Rate Constant ◽  
Anatase Phase ◽  
Ultra Violet ◽  
Tube Length ◽  
Nanotube Arrays ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube ◽  
Inner Diameter

The titania nanotube arrays (TNAs) with smooth surface was synthesized by anodization of titanium foil with 3 cm2in square area using the electrolyte composed of 0.2 wt% NH4F and 0.5 vol% H2SO4in ethylene glycol in order to evaluate the methylene blue photodegradation under ultra-violet irradiation. The tube length and inner diameter as a size parameter were controlled by the anodization time from 5 to 10 h and applied voltage from 10 to 50 V. The titania nanotube arrays (TNAs) annealed at 300 to 500°C were assigned to anatase phase, and TNAs at 600°C had both phase of anatase and rutile. The crystallite size and the apparent rate constant were increased with the increase in the annealing temperature of TNAs from 300 to 500°C. The bigger crystallite size of TNAs is suggested to be related to the increase in the amount of hole at the valence band, leading to the decrease in the apparent rate constant of MB degradation. Interestingly, the four kinds of linear relationship with the apparent rate constant were seen in both the inner diameter of TNAs and the length. Consequently, the apparent rate constant strongly depended on inner diameter of TNAs.

On the Sol-gel Synthesis and Characterization of Titanium Oxide Nanoparticles

2011 ◽  
Vol 1352 ◽  
Author(s):  
Varun Chaudhary ◽  
Amit K. Srivastava ◽  
Jitendra Kumar
Keyword(s):  
Band Gap ◽  
Crystallite Size ◽  
Anatase Phase ◽  
Sol Gel ◽  
Finite Size ◽  
Average Crystallite Size ◽  
Photo Luminescence ◽  
Titanium Isopropoxide ◽  
Rutile Phase ◽  
Excitation Wavelength

ABSTRACTTiO2 nanoparticles have been prepared by sol-gel process using titanium isopropoxide as a precursor with ethanol and water as solvents. The synthesis involves gel formation, digestion for 24h, drying at 100oC for 10h, and calcination in air at 500-800oC for 2h. The resulting powder has been studied with respect to phase(s), morphology, optical absorption and photo -luminescence (PL) behaviour. The calcination of dried sol-gel product at 500oC for 2h leads to formation of anatase phase that possesses a tetragonal structure (a = 3.785 Å, c = 9.514 Å, Z = 4), average crystallite size ~ 11 nm and band gap of 3.34 eV. Further, increasing the time (t) of calcination causes crystallite growth that follows the relation d = α – β exp (-t/τ), α = 18.1 nm, β = 9.6 nm and τ = 6.9h. However, calcination of sol-gel product at 800oC for 2h gives rise to a rutile phase (tetragonal a = 4.593Å, c = 2.959Å, Z = 2), average crystallite size ~ 25 nm and band gap of 3.02 eV. The anatase phase exhibits strong PL emission peaks (excitation wavelength 405 nm) at 2.06 and 1.99 eV due to defect levels within the energy band gap. This observation has been attributed to finite size effects occurring in nanoparticles.

scholarly journals An Amalgam of Mg-Doped TiO2 Nanoparticles Prepared by Sol-Gel Method for Effective Antimicrobial and Photocatalytic Activity

2021 ◽  
Author(s):  
N NITHYA ◽  
S Gopi ◽  
G Bhoopathi
Keyword(s):  
Crystallite Size ◽  
Anatase Phase ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Gram Positive ◽  
Tem Analysis ◽  
Gram Negative ◽  
Gel Method ◽  
Sol Gel Method ◽  
And Shifts

Abstract In this study, undoped and Magnesium doped TiO2 nanoparticles (Mg-TiO2 NPs) were successfully synthesized via a simple sol-gel method cost-effectively. The prepared Mg- TiO2 NPs were characterized by UV-Vis, FTIR, PL, XRD, FESEM, TEM, and EDAX. UV – Visible Spectroscopy showed that an increase in the optical bandgap concerning the concentration of dopant Mg increases. The bandgap values were found to be 3.57-3.54 eV. FTIR spectra showed that the presence of the characteristic stretching and bending vibrational band of Ti – O bonding at 468 cm-1 and shifts in vibrational bands were observed for Mg-TiO2 NPs. PL spectra of Mg- TiO2 NPs at different concentrations exhibit a strong UV emission band. X-ray diffraction confirmed the formation of the tetragonal anatase phase. The average crystallite size of prepared samples was found to be 22-19 nm. The average crystallite size of Mg- TiO2 NPs decreases with increasing the concentration of dopant Mg. The FESEM and TEM analysis confirmed that the spherical morphology for both TiO2 and Mg-TiO2 NPs. SAED pattern confirms the crystalline nature of prepared samples. EDAX spectra confirm the presence of Ti, O, and Mg and confirm that Mg2+ ions are present in the TiO2 lattices. The prepared samples were investigated against gram-positive (B. subtilis and S. aureus) and gram-negative (P. eugenia and K. Pneumonia) bacteria. The prepared samples showed potent antibacterial activity against gram-negative bacteria than the gram-positive bacteria. The prepared samples show the excellent photocatalytic degradation for Methylene blue.

scholarly journals Effect of Applied Potential on the Formation of Self-OrganizedTiO2Nanotube Arrays and Its Photoelectrochemical Response

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Chin Wei Lai ◽  
Srimala Sreekantan
Keyword(s):  
Aspect Ratio ◽  
Surface Area ◽  
Anatase Phase ◽  
Nanotube Arrays ◽  
Applied Potential ◽  
Effective Surface Area ◽  
Effective Surface ◽  
Air Atmosphere ◽  
Self Organized ◽  
Photoelectrochemical Response

Self-organized TiO2nanotube arrays have been fabricated by anodization of Ti foil in an electrochemical bath consisting of 1 M of glycerol with 0.5 wt% of NH4F. The effects of applied potential on the resulting nanotubes were illustrated. Among all of the applied potentials, 30 V resulted in the highest uniformity and aspect ratio TiO2nanotube arrays with the tube's length approximately 1 μm and pore's size of 85 nm. TiO2nanotube arrays were amorphous in as-anodized condition. The anatase phase was observed after annealing at 400∘Cin air atmosphere. The effect of crystallization and effective surface area of TiO2nanotube arrays in connection with the photoelectrochemical response was reported. Photoelectrochemical response under illumination was enhanced by using the annealed TiO2nanotube arrays which have larger effective surface area to promote more photoinduced electrons.

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