A New Fluoride Luminescence Quencher Based on a Nanostructured Covalently Bonded Terbium Hybrid Material

2010 ◽  
Vol 114 (32) ◽  
pp. 13879-13883 ◽  
Author(s):  
Qianming Wang ◽  
Chaoliang Tan ◽  
Hongyu Chen ◽  
Hitoshi Tamiaki
Keyword(s):  
Hybrid Material ◽  
Covalently Bonded

Optical Limiting of a Covalently Bonded Gold Nanoparticle/Polylysine Hybrid Material

2005 ◽  
Vol 109 (44) ◽  
pp. 20854-20857 ◽  
Author(s):  
Wenfang Sun ◽  
Qiu Dai ◽  
James G. Worden ◽  
Qun Huo
Keyword(s):  
Gold Nanoparticle ◽  
Hybrid Material ◽  
Optical Limiting ◽  
Covalently Bonded

An unusual way to luminescent terbium molecular-level hybrid materials: Modified methyl benzoic acid covalently bonded with silica as a bridge

2005 ◽  
Vol 20 (3) ◽  
pp. 592-598 ◽  
Author(s):  
Qianming Wang ◽  
Bing Yan
Keyword(s):  
Benzoic Acid ◽  
Hybrid Material ◽  
Photophysical Properties ◽  
Green Emission ◽  
Energy Difference ◽  
Luminescence Spectra ◽  
Triplet Energy ◽  
Covalent Bonds ◽  
Organic Part ◽  
Covalently Bonded

The syntheses of modified ortho or meta methylbenzoic acid by (3-aminopropyl)triethoxysilane and the preparation of their corresponding organic–inorganic molecular-based hybrid material with the two components equipped with covalent bonds are described. The organic part is a derivative of methyl benzoic acid, which is used to coordinate to Tb3+ and further introduced into silica matrices by Si–O bonds after hydrolysis and polycondensation processes. The Judd–Ofelt theory proves that covalency increases along with increasing reciprocal energy difference between the 4fN and 4fN−15d1 configurations. Ultraviolet absorption, phosphorescence spectra, and luminescence spectra were applied to characterize the photophysical properties of the obtained hybrid material, and the above spectroscopic data reveal that the triplet energy of modified methyl benzoic acid matches with the emissive energy level of Tb3+. In this way, the intramolecular energy transfer process took place within these molecular-based hybrids, and strong green emission of Tb3+ was obtained.

Preparation and fluorescent recognition properties for fluoride of a nanostructured covalently bonded europium hybrid material

2015 ◽  
Vol 33 (9) ◽  
pp. 905-910
Author(s):  
Xudong YU ◽  
Jingyin LI ◽  
Yajuan LI ◽  
Lijun GENG ◽  
Xiaoli ZHEN ◽  
...  
Keyword(s):  
Hybrid Material ◽  
Covalently Bonded ◽  
Fluorescent Recognition

Highly selective fluorescent sensing for fluoride based on a covalently bonded europium mesoporous hybrid material

2016 ◽  
Vol 227 ◽  
pp. 660-667 ◽  
Author(s):  
Yajuan Li ◽  
Dongyan Xie ◽  
Xuelei Pang ◽  
Xudong Yu ◽  
Tao Yu ◽  
...  
Keyword(s):  
Hybrid Material ◽  
Fluorescent Sensing ◽  
Covalently Bonded

Morphological studies of linear (AB)n multiblock copolymers and their blends

1992 ◽  
Vol 50 (1) ◽  
pp. 384-385
Author(s):  
Richard J. Spontak ◽  
Steven D. Smith ◽  
Arman Ashraf
Keyword(s):  
Electron Microscopy ◽  
Microphase Separation ◽  
Multiblock Copolymers ◽  
First Order ◽  
Morphological Studies ◽  
Transmission Electron ◽  
First Order Phase Transition ◽  
Covalently Bonded ◽  
Total Molecular Weight ◽  
First Order Phase

Block copolymers are composed of sequences of dissimilar chemical moieties covalently bonded together. If the block lengths of each component are sufficiently long and the blocks are thermodynamically incompatible, these materials are capable of undergoing microphase separation, a weak first-order phase transition which results in the formation of an ordered microstructural network. Most efforts designed to elucidate the phase and configurational behavior in these copolymers have focused on the simple AB and ABA designs. Few studies have thus far targeted the perfectly-alternating multiblock (AB)n architecture. In this work, two series of neat (AB)n copolymers have been synthesized from styrene and isoprene monomers at a composition of 50 wt% polystyrene (PS). In Set I, the total molecular weight is held constant while the number of AB block pairs (n) is increased from one to four (which results in shorter blocks). Set II consists of materials in which the block lengths are held constant and n is varied again from one to four (which results in longer chains). Transmission electron microscopy (TEM) has been employed here to investigate the morphologies and phase behavior of these materials and their blends.

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