نتایج جستجو برای: c20 fullerenes

تعداد نتایج: 5000  

Journal: :Annals of the New York Academy of Sciences 2008
Carlos Baleizão Mário N Berberan-Santos

This report reviews the thermally activated delayed fluorescence (TADF) displayed by fullerenes. From the analysis of the steady-state data, time-resolved data, or by a combination of both, it is possible to determine several important photophysical parameters of fullerenes. Herein we also cover the development of temperature and oxygen sensors based on the TADF effect exhibited by fullerene C(...

Journal: :iranian chemical communication 2016
mahboube eslami moghadam abdolghafar abolhosseini shahrnoy taghi karimi satar alyar

fullerene chemistry is nowadays a well-established field of both theoretical and experimental investigations‎. this study considers the symmetry of small fullerenes cage c24 and c28‎. ‎using pm3 program for c24 and c28 fullerenes, oh and td symmetry were confirmed, respectively‎. ‎ the mentioned algorithm to compute the automorphism group of these fullerenes with connectivity and geometry of th...

Journal: :Physical chemistry chemical physics : PCCP 2015
Elias A Toivanen Sergio A Losilla Dage Sundholm

Algorithms and working expressions for a grid-based fast multipole method (GB-FMM) have been developed and implemented. The computational domain is divided into cubic subdomains, organized in a hierarchical tree. The contribution to the electrostatic interaction energies from pairs of neighboring subdomains is computed using numerical integration, whereas the contributions from further apart su...

Journal: :Journal of chemical information and modeling 2012
Gunnar Brinkmann Jan Goedgebeur Brendan D. McKay

We describe an efficient new algorithm for the generation of fullerenes. Our implementation of this algorithm is more than 3.5 times faster than the previously fastest generator for fullerenes - fullgen - and the first program since fullgen to be useful for more than 100 vertices. We also note a programming error in fullgen that caused problems for 136 or more vertices. We tabulate the numbers ...

Journal: :Organic & biomolecular chemistry 2012
Jean-Benoît Giguère Jean-François Morin

New strapped porphyrin-based hosts with different π-conjugated moieties and linkers have been prepared and their ability to bind with fullerenes was studied in dilute solution. We found that the ability of these hosts to bind with fullerenes strongly depends on their chemical nature and more precisely on the substitution pattern of the porphyrin deck. As expected, the more electron-rich hosts c...

2011
R.J.K. Udayana Ranatunga Steven O. Nielsen

Biological applications of fullerenes are severely impeded by our incomplete understanding of their toxicity. Here we extend a recently developed computational method to gain insight into the behavior of fullerenes in lipid bilayer systems. The physical behavior of fullerenes is captured through a continuum model incorporating both their hollow geometry and surface chemistry. By using this mode...

2005
Mina Yoon Savas Berber David Tománek

We use structure-optimization techniques to study the equilibrium packing of fullerenes in carbon nanotube peapods. Our results for nanotubes containing Cn fullerenes with 60ønø84 atoms indicate that the fullerenes are more densely packed in the nanotubes than in the bulk crystal, in agreement with experimental data. We find that the reduction of the interfullerene distance, as well as a struct...

Journal: :Bioscience, biotechnology, and biochemistry 2012
Akio Kadowaki Satoshi Iwamoto Ryo Yamauchi

The antioxidative effect of fullerenes C(60) and C(70) was examined by measuring the inhibition of methyl linoleate (MeL) peroxidation in toluene initiated by 2,2'-azobis(2,4-dimethylvaleronitrile) (AMVN). The fullerenes retarded the formation of MeL hydroperoxides and lowered the rate of propagation. The reaction rates of fullerenes with AMVN-derived peroxyl radicals were much higher than that...

Journal: :Symmetry 2015
Jennifer J. Edmond Jack E. Graver

Fullerenes are molecules of carbon that are modeled by trivalent plane graphs with only pentagonal and hexagonal faces. Scaling up a fullerene gives a notion of similarity, and fullerenes are partitioned into similarity classes. In this expository article, we illustrate how the values of two important fullerene parameters can be deduced for all fullerenes in a similarity class by computing the ...

2002
Noejung Park Kyuho Lee Seungwu Han Jaejun Yu Jisoon Ihm

The energetics of large-sized fullerenes and carbon nanotubes is investigated through first-principles pseudopotential calculations for the carbon cluster of CN (60<N<540). The strain energy due to the presence of pentagons, in addition to the curvature effect, makes an important contribution to the energetics of the fullerenes and nanotubes and accurately describes the N dependence of the ener...

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