Modulating lifetimes and relaxation times of phenoxyl radicals through their incorporation into different hybrid nanostructures

2019 ◽  
Vol 21 (29) ◽  
pp. 16337-16344 ◽  
Author(s):  
Cyrielle Dol ◽  
Guillaume Gerbaud ◽  
Bruno Guigliarelli ◽  
Emily Bloch ◽  
Stéphane Gastaldi ◽  
...  
Keyword(s):  
Physical Properties ◽  
Hybrid Materials ◽  
Relaxation Times ◽  
Structural Features ◽  
Hybrid Nanostructures ◽  
Phenoxyl Radicals

Playing with the structural features of various hybrid materials enables to adjust physical properties of phenoxyl radicals.

scholarly journals Complex ceramic structures. I. Weberites

2009 ◽  
Vol 65 (3) ◽  
pp. 269-290 ◽  
Author(s):  
Lu Cai ◽  
Juan C. Nino
Keyword(s):  
Physical Properties ◽  
Ionic Radius ◽  
Structural Features ◽  
Stability Field ◽  
Bond Ionicity ◽  
Coordination Environment ◽  
Technological Potential ◽  
Axial Transformation ◽  
First Time ◽  
Selection Of

The weberite structure (A 2 B 2 X 7) is an anion-deficient fluorite-related superstructure. Compared with fluorites, the reduction in the number of anions leads to a decrease in the coordination number of the B cations (VI coordination) with respect to the A cations (VIII coordination), thus allowing the accommodation of diverse cations. As a result, weberite compounds have a broad range of chemical and physical properties and great technological potential. This article summarizes the structural features of weberite and describes the structure in several different ways. This is the first time that the stacking vector and stacking angle are used to represent the weberite structure. This paper also discusses the crystallographic relationship between weberite, fluorite and pyrochlore (another fluorite-related structure). The cation sublattices of weberite and pyrochlore are correlated by an axial transformation. It has been shown that the different coordination environment of anions is due to the alternating layering of the AB 3 and A 3 B close-packed cation layers. A stability field of weberite oxides is proposed in terms of the ratio of ionic radius of cations and relative bond ionicity. In addition, a selection of weberite compounds with interesting properties is discussed.

The Properties of Silica and Hybrid Nanostructures

2010 ◽  
Vol 1256 ◽  
Author(s):  
Avi Shalav ◽  
Robert Elliman ◽  
Taehyun Kim
Keyword(s):  
Physical Properties ◽  
Growth Mechanism ◽  
Optically Active ◽  
Hybrid Nanostructures ◽  
Si Substrate ◽  
Active Oxidation ◽  
Vapor Liquid Solid ◽  
Coating Methods ◽  
Secondary Materials ◽  
Vapor Liquid Solid Growth

AbstractSiOx nanowires can be grown via the vapor-liquid-solid growth mechanism using SiO vapor produced during the active oxidation of a Si substrate. The as-grown SiOx nanowire have a range of useful physical properties but can also be used as large surface area substrates for the growth of secondary materials. In this study we report the use of optically active impurities to grow and dope secondary nanowire structures, and the use of simple coating methods to enhance and extend the functionality of these unique nanowire substrates.

scholarly journals Structural features and physical properties of In2Bi3Se7I and InBi2Se4I

2011 ◽  
Vol 67 (a1) ◽  
pp. C495-C495
Author(s):  
T. Rosenthal ◽  
M. Döblinger ◽  
P. J. Wagatha ◽  
O. Oeckler
Keyword(s):  
Physical Properties ◽  
Structural Features

scholarly journals Heterometal Grafted metalla-ynes and Poly(metalla-ynes): A Review on Structure–Property Relationships and Applications

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3654
Author(s):  
Rayya A. Al-Balushi ◽  
Ashanul Haque ◽  
Idris J. Al-Busaidi ◽  
Houda Al-Sharji ◽  
Muhammad S. Khan
Keyword(s):  
Physical Properties ◽  
Main Chain ◽  
Functional Materials ◽  
Photo Luminescence ◽  
Structural Features ◽  
Side Chain ◽  
Structure Property ◽  
Molecular Scaffolds ◽  
Structure Property Relationships ◽  
Rigid Rod

Metalla-ynes and poly(metalla-ynes) have emerged as unique molecular scaffolds with fascinating structural features and intriguing photo-luminescence (PL) properties. Their rigid-rod conducting backbone with tunable photo-physical properties has generated immense research interests for the design and development of application-oriented functional materials. Introducing a second d- or f-block metal fragment in the main-chain or side-chain of a metalla-yne and poly(metalla-yne) was found to further modulate the underlying features/properties. This review focuses on the photo-physical properties and opto-electronic (O-E) applications of heterometal grafted metalla-ynes and poly(metalla-ynes).

scholarly journals Preparation, Thermal, and Physical Properties of Perovskite-Type (C3H7NH3)2CdCl4 Crystals

Crystals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 108 ◽  
Author(s):  
Ae Lim ◽  
Sun Kim
Keyword(s):  
Phase Transitions ◽  
Physical Properties ◽  
Relaxation Times ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Spin Lattice Relaxation ◽  
Magic Angle ◽  
Scanning Calorimetry ◽  
Two Phase ◽  
Perovskite Type

To investigate the thermal and physical properties of perovskite-type (C3H7NH3)2CdCl4, its temperature-dependent chemical shifts and spin–lattice relaxation times are measured using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), magic angle spinning nuclear magnetic resonance (MAS NMR), and static NMR methods. Above 300 K, two phase transitions are observed at 398 K and 538 K. Each proton and carbon in the (C3H7NH3) cation is distinguished in the MAS NMR results. The environments around 1H, 13C, and 14N do not change with temperature according to the NMR spectra. In contrast, the resonance frequency of 113Cd in the CdCl6 octahedra decreases with increasing temperature, indicating an environmental change. The uniaxial rotations for 1H and 13C have high mobility at both high and low temperatures, and these are related to the phase transitions. In addition, the molecular motion of 113Cd in the anion becomes activated upon raising the temperature.

Polysiloxanes and Related Polymers

2005 ◽  
Author(s):  
James E. Mark ◽  
Harry R. Allcock ◽  
Robert West
Keyword(s):  
Physical Properties ◽  
High Performance ◽  
Amorphous State ◽  
Structural Features ◽  
Inorganic Polymers ◽  
Trans Form ◽  
Synthesis Properties ◽  
Temperature Application ◽  
Siloxane Polymers ◽  
Commercial Applications

At the present time, polysiloxanes are unique among inorganic and semi-inorganic polymers. They have been the most studied by far, and are the most important with regard to commercial applications. Thus, it is not surprising that a large number of review articles exist describing the synthesis, properties, and applications of these materials. The Si-O backbone of this class of polymers endows it with a variety of intriguing properties. For example, the strength of this bond gives the siloxane polymers considerable thermal stability, which is very important for their use in high-temperature application (for example as heat-transfer agents and high-performance elastomers). The nature of the bonding and the chemical characteristics of typical side groups give the chains a very low surface free energy and, therefore, highly unusual and desirable surface properties. Not surprising, polysiloxanes are much used, for example, as mold-release agents, for waterproofing garments, and as biomedical materials. Some unusual structural features of the chains give rise to physical properties that are also of considerable scientific interest. For example, the substituted Si atom and the unsubstituted O atom differ greatly in size, giving the chain a very irregular cross section. This influences the way the chains pack in the bulk, amorphous state, which, in turn, gives the chains very unusual equation-of-state properties (such as compressibilities). Also, the bond angles around the O atom are much larger than those around the Si, and this makes the planar all-trans form of the chain approximate a series of closed polygons. As a result, siloxane chains exhibit a number of interesting configurational characteristics. These structural features, and a number of properties and their associated applications, will be discussed in this chapter. The major categories of homopolymers and copolymers to be discussed are linear siloxane polymers [-SiRR'O-] (with various alkyl and aryl R,R' side groups), (ii) sesquisiloxane polymers possibly having a ladder structure, (iii) siloxane-silarylene polymers [-Si(CH3)2OSi(CH3)2(C6H4)m-] (where the skeletal phenylene units are either meta or para), (iv) silalkylene polymers [-Si(CH3)2(CH2)m-], and (v) random and block copolymers, and blends of some of the above. Topics of particular importance are the structure, flexibility, transition temperatures, permeability, and other physical properties.

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