Purpose-built metal oxide nanomaterials. The emergence of a new generation of smart materials

2000 ◽  
Vol 72 (1-2) ◽  
pp. 47-52 ◽  
Author(s):  
Lionel Vayssieres ◽  
Anders Hagfeldt ◽  
Sten Eric Lindquist
Keyword(s):  
Interfacial Tension ◽  
Metal Oxide ◽  
Nanostructured Materials ◽  
Smart Materials ◽  
Aging Process ◽  
Structural Requirements ◽  
Thermodynamic Stabilization ◽  
Metal Oxide Nanomaterials ◽  
Growth And Aging ◽  
New Generation

A new concept has been developed in order to achieve a new generation of smart materials, namely purpose-built materials, modeled and designed to match the physical and structural requirements of their applications. A model based on the thermodynamic monitoring of the nucleation, growth, and aging process of metal oxide by minimization of the interfacial tension, yielding to the thermodynamic stabilization of the system, results in well-designed and well-ordered nanostructured materials with the required porosity, morphology, size, and orientation on various substrates.

Synthesis of Spinel-Metal-Oxide/Biopolymer Hybrid Nanostructured Materials

2010 ◽  
Vol 114 (41) ◽  
pp. 17574-17579 ◽  
Author(s):  
M. A. Garza-Navarro ◽  
A. Torres-Castro ◽  
D. I. García-Gutiérrez ◽  
L. Ortiz-Rivera ◽  
Y. C. Wang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Nanostructured Materials

scholarly journals Advanced development of metal oxide nanomaterials for H2 gas sensing applications

2021 ◽  
Author(s):  
Yushu Shi ◽  
Huiyan Xu ◽  
Tongyao Liu ◽  
Shah Zeb ◽  
Yong Nie ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Gas Sensing ◽  
The Past ◽  
Sensing Applications ◽  
The Future ◽  
Metal Oxide Nanomaterials ◽  
Nanomaterials Synthesis ◽  
Advanced Development

The scheme of the structure of this review includes an introduction from the metal oxide nanomaterials’ synthesis to application in H2 gas sensors—a vision from the past to the future.

CEMENTAL DEPOSITION AS AN AGE CRITERION IN BISON, AND THE RELATION OF INCISOR WEAR, EYE-LENS WEIGHT, AND DRESSED BISON CARCASS WEIGHT TO AGE

1965 ◽  
Vol 43 (1) ◽  
pp. 173-178 ◽  
Author(s):  
N. S. Novakowski
Keyword(s):  
Aging Process ◽  
Annual Growth ◽  
Carcass Weight ◽  
Chronological Age ◽  
Eye Lens ◽  
Tooth Replacement ◽  
Northern Latitudes ◽  
Growth And Aging

The relation of cemental deposition, incisor wear, eye-lens weight, and dressed carcass weight to age in bison was investigated in an attempt to define this relation on the basis of annual increments. It was expected that the bison, particularly in northern latitudes, would be subject to a cyclic or annual growth and aging process which would be reflected in an analysis of the above criteria. It was found that cemental deposition occurred in the premolars and molars beyond age 4 1/2 and that this deposition appeared in the form of alternating layers of translucent and opaque cementum, each set combined to form one annual band. Incisor wear provided a further check on this technique. It was found that eye-lens weight and dressed carcass weight were not reliable indicators of chronological age, particularly beyond 4 1/2 years of age when tooth replacement could not be used to define the limits of variability found in eye-lens weights and dressed carcass weights.

A review of photocatalytic characterization, and environmental cleaning, of metal oxide nanostructured materials

2021 ◽  
Vol 30 ◽  
pp. e00343
Author(s):  
Muhammad Ikram ◽  
Mahak Rashid ◽  
Ali Haider ◽  
Sadia Naz ◽  
Junaid Haider ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Nanostructured Materials ◽  
Environmental Cleaning

scholarly journals Features of obtaining the catalyst for the synthesis of carbon nanotubes

2019 ◽  
Vol 81 (2) ◽  
pp. 261-267 ◽  
Author(s):  
E. A. Burakova ◽  
G. S. Besperstova ◽  
M. A. Neverova ◽  
A. G. Tkachev ◽  
N. V. Orlova ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Decomposition ◽  
Metal Oxide ◽  
Specific Surface ◽  
Surface Area ◽  
Nanostructured Materials ◽  
Specific Surface Area ◽  
Oxide System ◽  
Decomposition Stage ◽  
Al2o3 Catalyst

In this paper, the features of obtaining a Co-Mo/Al2O3 catalyst to synthesize carbon nanotubes (CNTs) by thermal decomposition were studied. It was revealed that the duration of the pre-catalyst thermal decomposition stage in the process of developing a metal oxide system has a significant impact on its activity in the synthesis of carbon nanostructured materials by chemical vapor deposition (CVD). It was proved that an effective catalyst for CNTs synthesis can be obtained by through thermal decomposition of the pre – catalyst, without calcination of the metal oxide system. The use of the Co-Mo/Al2O3 catalyst, synthesized in such a way, in the CVD process makes it possible to reduce the cost of synthesized CNTs. Using scanning electron microscopy, it was shown that the size of the grains, and specific surface area of the formed Co-Mo/Al2O3 catalyst depend on the thermal treatment conditions of the pre-catalyst. Under the conditions for the implementation of the pre-catalyst thermal decomposition stage (temperature, volume, duration, etc.), it is possible to contro not only the characteristics of the resulting catalyst (specific surface area, efficiency), but also the characteristics of the CNTs (diameter, degree of defectiveness). In the course of experiments, the optimal modes of implementation of the method for obtaining the Co-Mo/Al2O3 catalyst allowed forming a system with a specific surface area of ~ 108 m2/g. The use of the resulting catalyst in the synthesis of nanostructured materials provides a high specific yield of multi-walled CNTs with a diameter of 8-20 nm and a degree of defectiveness of 0.97.

scholarly journals Grouping concept for metal and metal oxide nanomaterials with regard to their ecotoxicological effects on algae, daphnids and fish embryos

NanoImpact ◽  
2018 ◽  
Vol 9 ◽  
pp. 52-60 ◽  
Author(s):  
Kerstin Hund-Rinke ◽  
Karsten Schlich ◽  
Dana Kühnel ◽  
Bryan Hellack ◽  
Heinz Kaminski ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Fish Embryos ◽  
Ecotoxicological Effects ◽  
Metal Oxide Nanomaterials
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