Similarity between the first ionized state of the oxygen vacancy double donor in tantalum oxide and the first ionized state of the cadmium vacancy double acceptor in cadmium sulfide

2007 ◽  
Vol 90 (22) ◽  
pp. 222904 ◽  
Author(s):  
W. S. Lau
Keyword(s):  
Oxygen Vacancy ◽  
Cadmium Sulfide ◽  
Tantalum Oxide ◽  
Cadmium Vacancy

Tantalum Oxide Nanoparticles as Versatile Contrast Agents for X-ray Computed Tomography

2020 ◽  
Author(s):  
Shatadru Chakravarty ◽  
Jeremy Hix ◽  
Kaitlyn Wieweora ◽  
Maximilian Volk ◽  
Elizabeth Kenyon ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Contrast Agents ◽  
Mesoporous Silica Nanoparticles ◽  
Sol Gel ◽  
Tantalum Oxide ◽  
High Signal ◽  
Drug Delivery Vehicles ◽  
X Ray Computed

Here we describe the synthesis, characterization and in vitro and in vivo performance of a series of tantalum oxide (TaOx) based nanoparticles (NPs) for computed tomography (CT). Five distinct versions of 9-12 nm diameter silane coated TaOx nanocrystals (NCs) were fabricated by a sol-gel method with varying degrees of hydrophilicity and with or without fluorescence, with the highest reported Ta content to date (78%). Highly hydrophilic NCs were left bare and were evaluated in vivo in mice for micro-CT of full body vasculature, where following intravenous injection, TaOx NCs demonstrate high CT contrast, circulation in blood for ~ 3 h, and eventual accumulation in RES organs; and following injection locally in the mammary gland, where the full ductal tree structure can be clearly delineated. Partially hydrophilic NCs were encapsulated within mesoporous silica nanoparticles (MSNPs; TaOx@MSNPs) and hydrophobic NCs were encapsulated within poly(lactic-co-glycolic acid) (PLGA; TaOx@PLGA) NPs, serving as potential CT-imagable drug delivery vehicles. Bolus intramuscular injections of TaOx@PLGA NPs and TaOx@MSNPs to mimic the accumulation of NPs at a tumor site produce high signal enhancement in mice. In vitro studies on bare NCs and formuated NPs demonstrate high cytocompatibility and low dissolution of TaOx. This work solidifies that TaOx-based NPs are versatile contrast agents for CT.

Impact Of Synthesis Route on the Water Oxidation Kinetics of Hematite Photoanodes

2020 ◽  
Author(s):  
Camilo A. Mesa ◽  
Ludmilla Steier ◽  
Benjamin Moss ◽  
Laia Francàs ◽  
James E. Thorne ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Reaction Kinetics ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Oxidation Reaction ◽  
Charge Accumulation ◽  
Optical Signals ◽  
Current Voltage ◽  
Voltage Performance ◽  
Kinetics Of

<p><i>Operando</i> spectroelectrochemical analysis is used to determine the water oxidation reaction kinetics for hematite photoanodes prepared using four different synthetic procedures. Whilst these photoanodes exhibit very different current / voltage performance, their underlying water oxidation kinetics are found to be almost invariant. Lower photoanode performance was found to correlate with the observation of optical signals indicative of charge accumulation in mid-gap oxygen vacancy states, indicating these states do not contribute directly to water oxidation.</p>

The possibility of using tantalum oxide microparticles in phosphate glass for radiation therapy of malignant neoplasms

2020 ◽  
pp. 85-87
Author(s):  
O. S. Plotnikova ◽  
V. I. Apanasevich ◽  
M. A. Medkov ◽  
A. A. Polezhaev ◽  
V. I. Nevozhai ◽  
...  
Keyword(s):  
Phosphate Glass ◽  
Linear Accelerator ◽  
Malignant Tumors ◽  
Video Recording ◽  
Tantalum Oxide ◽  
Vertical Plane ◽  
Secondary Radiation ◽  
Semiconductor Diode ◽  
Malignant Neoplasms ◽  
Diode Detector

Objective: The creation of the medicine for a local radiomodification of tumors.Methods: The level of the secondary radiation on the surface of the phosphate glass powder with the inclusion of tantalum oxide processed by 6 MeV deceleration emission was studied. Medical linear accelerator TrueBeam (Varian, USA), and Semiconductor diode detector PDI 2.0 (Sun Nuclear Corp., USA) having the system of moving in vertical plane and the system of position video recording were used.Results: The presence of the phosphate glass (containing 20% Та2О5) on the surface gave a 63.7% increase to the secondary radiation. It’s around two thirds of the overall level.Conclusion: An opportunity to create a medicine on the basis of phosphate glass, containing tantalum oxide, for local radiomodification of malignant tumors. 

Enhanced photocatalytic activity of perovskite NaNbO3 by oxygen vacancy engineering

2019 ◽  
Vol 21 (22) ◽  
pp. 11697-11704 ◽  
Author(s):  
Bian Yang ◽  
Jihong Bian ◽  
Lei Wang ◽  
Jianwei Wang ◽  
Yaping Du ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancy

Oxygen vacancy engineering can improve the photocatalytic activity of perovskite NaNbO3.

Improvement of reliability of polymer nanocomposite based transparent memory device by oxygen vacancy rich ZnO nanorods

2016 ◽  
Vol 164 ◽  
pp. 53-58 ◽  
Author(s):  
Snigdha Bhattacharjee ◽  
Pranab Kumar Sarkar ◽  
Nandini Roy ◽  
Asim Roy
Keyword(s):  
Oxygen Vacancy ◽  
Zno Nanorods ◽  
Polymer Nanocomposite ◽  
Memory Device

Oxygen Vacancy Engineering in Fe Doped Akhtenskite-Type MnO2 for Low-Temperature Toluene Oxidation

2020 ◽  
pp. 119873
Author(s):  
Yu Wang ◽  
Ji Wu ◽  
Gang Wang ◽  
Dengyao Yang ◽  
Tatsumi Ishihara ◽  
...  
Keyword(s):  
Low Temperature ◽  
Oxygen Vacancy ◽  
Toluene Oxidation

Boosted charge transfer in oxygen vacancy-rich K+ birnessite MnO2 for water oxidation and zinc-ion batteries

2021 ◽  
Vol 378 ◽  
pp. 138147
Author(s):  
MengXian Lin ◽  
Fuqiang Shao ◽  
Shuting Weng ◽  
Shanshan Xiong ◽  
Shuai Liu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Oxygen Vacancy ◽  
Water Oxidation ◽  
Zinc Ion
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