scispace - formally typeset
Search or ask a question
Institution

National Aerospace Laboratories

FacilityBengaluru, India
About: National Aerospace Laboratories is a facility organization based out in Bengaluru, India. It is known for research contribution in the topics: Coating & Corrosion. The organization has 1838 authors who have published 2349 publications receiving 36888 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the dispersion of noble metal ions by solution combustion as well as other methods over CeO2 and TiO2 resulting mainly in Ce1−xMxO2−δ, Ce 1−x−yTixMyO2+δ.
Abstract: In the past four decades, CeO2 has been recognized as an attractive material in the area of auto exhaust catalysis because of its unique redox properties. In the presence of CeO2, the catalytic activity of noble metals supported on Al2O3 is enhanced due to higher dispersion of noble metals in their ionic form. In the last few years, we have been exploring an entirely new approach of dispersing noble metal ions on CeO2 and TiO2 matrices for redox catalysis. In this study, the dispersion of noble metal ions by solution combustion as well as other methods over CeO2 and TiO2 resulting mainly in Ce1−xMxO2−δ, Ce1−x−yTixMyO2−δ, Ce1−x−ySnxMyO2−δ, Ce1−x−yFexMyO2−δ, Ce1−x−yZrxMyO2−δ and Ti1−xMxO2−δ (M = Pd, Pt, Rh and Ru) catalysts, the structure of these materials, their catalytic properties toward different types of catalysis, structure–property relationships and mechanisms of catalytic reactions are reviewed. In these catalysts, noble metal ions are incorporated into a substrate matrix to a certain limit in a solid solution form. Lower valent noble metal-ion substitution in CeO2 and TiO2 creates noble metal ionic sites and oxide ion vacancies that act as adsorption sites for redox catalysis. It has been demonstrated that these new generation noble metal ionic catalysts (NMIC) have been found to be catalytically more active than conventional nanocrystalline noble metal catalysts dispersed on oxide supports.

51 citations

Journal ArticleDOI
TL;DR: In this paper, a nanometric multi-scale rough, transparent and anti-reflective zinc oxide (ZnO) superhydrophobic coating on TiAlN/TiAlON/Si3N4 spectrally selective solar absorber surface was developed for solar thermal power generation applications.

50 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of pyrene concentration in the paint and the thickness of the active layer on the paint stability was studied and it was shown that the paint degradation in wind tunnel is mainly due to diffusion and evaporation of the pyrene.
Abstract: Even though pyrene-based pressure sensitive paints have some special advantages like high quantum efficiency, good pressure sensitivity and low temperature sensitivity, these paints exhibit steady degradation of the fluorescent intensity after each wind tunnel test. It has been reported that pyrene-based paints degrade because pyrene has a tendency to evaporate. It is necessary to understand the mechanism of degradation of pyrene-based paints in order to find a solution to this problem. Thermal aging tests and UV exposure tests of the paint specimens are carried out to study the effect of experimental parameters like temperature, pressure and UV exposure on the paint stability. This study has shown that the paint degradation in wind tunnel is mainly due to diffusion and evaporation of pyrene. The effect of pyrene concentration in the paint and the thickness of the active layer on the paint stability were also studied. © 2003 Elsevier B.V. All rights reserved.

50 citations

Journal ArticleDOI
TL;DR: In this article, an attempt was made to treat the municipal wastewater using iron impregnated polyacrylamide (IIPA) powder catalyst in a fluidized reactor, which was characterized by carbon, 12.23%, hydrogen, 1.63%, nitrogen, 2.93%, iron, 58, silicon, 15.25, surface area 96.66 m2 g−1 and pore diameter, 58.32 A.
Abstract: The persistent organic pollutants and bio diversities (pathogenic and non-pathogenic) present in treated municipal wastewater cause environmental deterioration besides adversely affecting human health. In the present investigation, an attempt was made to treat the municipal wastewater using iron impregnated polyacrylamide (IIPA) powder catalyst in a fluidized reactor. The IIPA catalyst was characterized by carbon, 12.23%, hydrogen, 1.63%, nitrogen, 2.93%, iron, 58%, silicon, 15.25%, surface area 96.66 m2 g−1 and pore diameter, 58.32 A. IIPA was crystalline with an energy gap of 1.93 eV and it was capable of generating hydroxyl radicals for the oxidation of dissolved organics in municipal wastewater with minimum sludge yield (0.05 g VSS/g of COD). The oxidation of dissolved organics in municipal wastewater by IIPA was carried out under batch and continuous mode operations. The pseudo first order rate kinetic constants for the oxidation of organics in municipal wastewater were found to be 2.2 × 10−2, 3.01 × 10−2, 3.33 × 10−2 and 3.72 × 10−2 min−1. The activation energy for the oxidation of dissolved organics in municipal wastewater was 13.15 kJ mol−1. The pollution parameters BOD5, COD, ammonia, TKN and sulphide were removed from the municipal wastewater by 72.72%, 82.87%, 71.76%, 65.3% and 86.66% respectively.

50 citations

Journal ArticleDOI
TL;DR: In this paper, the role of Ni addition on reaction kinetics and densification of the composites has been studied, showing that Ni addition significantly aids densification by plastic flow and vacancy diffusion mechanism.
Abstract: Dense ZrB2-ZrC and ZrB2-ZrCx∼0.67 composites have been produced by reactive hot pressing (RHP) of stoichiometric and nonstoichiometric mixtures of Zr and B4C powders at 40 MPa and temperatures up to 1600 °C for 30 minutes. The role of Ni addition on reaction kinetics and densification of the composites has been studied. Composites of ∼97 pct relative density (RD) have been produced with the stoichiometric mixture at 1600 °C, while the composite with ∼99 pct RD has been obtained with excess Zr at 1200 °C, suggesting the formation of carbon deficient ZrC x that significantly aids densification by plastic flow and vacancy diffusion mechanism. Stoichiometric and nonstoichiometric composites have a hardness of ∼20 GPa. The grain sizes of ZrB2 and ZrCx∼0.67 are ∼0.6 and 0.4 μm, respectively, which are finer than those reported in the literature.

50 citations


Authors

Showing all 1850 results

NameH-indexPapersCitations
Harish C. Barshilia462366825
K.S. Rajam42834765
Kozo Fujii394115845
Parthasarathi Bera391365329
R.P.S. Chakradhar361664423
T. N. Guru Row363095186
Takashi Ishikawa361545019
Henk A. P. Blom341685992
S. Ranganathan332115660
S.T. Aruna331014954
Arun M. Umarji332073582
Vinod K. Gaur33924003
Keisuke Asai313503914
K. J. Vinoy302403423
Gangan Prathap302413466
Network Information
Related Institutions (5)
Indian Institute of Technology Madras
36.4K papers, 590.4K citations

88% related

Indian Institute of Technology Kanpur
28.6K papers, 576.8K citations

88% related

Indian Institute of Technology Kharagpur
38.6K papers, 714.5K citations

86% related

Indian Institutes of Technology
40.1K papers, 652.9K citations

86% related

Indian Institute of Technology Delhi
26.9K papers, 503.8K citations

85% related

Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202310
202216
2021143
2020100
201996
2018119