scholarly journals Energy transfer and chemical dynamics at solid surfaces: The special role of charge transfer

2008 ◽  
Vol 83 (3) ◽  
pp. 167-214 ◽  
Author(s):  
A WODTKE ◽  
D MATSIEV ◽  
D AUERBACH
2015 ◽  
Vol 2015 (18) ◽  
pp. 3019-3027 ◽  
Author(s):  
Yolanda C. Miranda ◽  
Leide L. A. L. Pereira ◽  
José H. P. Barbosa ◽  
Hermi F. Brito ◽  
Maria C. F. C. Felinto ◽  
...  

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Md. Wahadoszamen ◽  
Iris Margalit ◽  
Anjue Mane Ara ◽  
Rienk van Grondelle ◽  
Dror Noy

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3529
Author(s):  
Joanna Kowalczyk ◽  
Monika Madej ◽  
Wojciech Dzięgielewski ◽  
Andrzej Kulczycki ◽  
Magdalena Żółty ◽  
...  

If a lubricant contains structures capable of conducting energy, reactions involving zinc dialkyldithiophosphate (ZDDP) may take place both very close to and away from the solid surfaces, with this indicating that ZDDP can be a highly effective anti-wear (AW) additive. The central thesis of this article is that the tribocatalytic effect is observed only when the energy emitted by the solids is transmitted by ordered molecular structures present in the lubricant, e.g., graphene. The friction tests were carried out for 100Cr6 steel balls in a sliding contact with uncoated or W-DLC-coated HS6-5-2C steel discs in the presence of polyalphaolefin 8 (PAO 8) as the lubricant, which was enhanced with graphene and/or ZDDP. There is sufficient evidence of the interactions occurring between ZDDP and graphene and their effects on the tribological performance of the system. It was also found that the higher the concentration of zinc in the wear area, the lower the wear. This was probably due to the energy transfer resulting from the catalytic decomposition of ZDDP molecules. Graphene, playing the role of the catalyst, contributed to that energy transfer.


2020 ◽  
Vol 8 (26) ◽  
pp. 8823-8839
Author(s):  
Maksym Buryi ◽  
Lubomír Havlák ◽  
Vítězslav Jarý ◽  
Jan Bárta ◽  
Valentyn Laguta ◽  
...  

Several sets of Eu-doped Y3Al5O12 (YAG) ceramic samples were synthesized by the vacuum sintering technique. Absorption bands at 250, 370 and 550 nm in samples were attributed to the charge transfer transition in the EuY2+ + F+ pair center.


2001 ◽  
Vol 16 (9) ◽  
pp. 2568-2571 ◽  
Author(s):  
J. K. Park ◽  
C. H. Kim ◽  
K. J. Choi ◽  
H. D. Park ◽  
S. Y. Choi

The purpose of this study is to develop an understanding of the photoluminescence properties of Al3+, Pr3+ doped perovskite-type La2/3TiO3 and pyrochlore-type La2Ti2O7 phosphor, which is characterized by the red emission (1D2 →3H4 transition) of the Pr3+ ion. The explanation for the energy transfer and the corresponding critical distance is proposed on the basis of the role of Al3+ ions in the perovskite-type La2/3TiO3:Pr phosphor. To clarify the distinction of photoluminescence properties between the perovskite-type La2/3TiO3 and the pyrochlore-type La2Ti2O7, the trap-involved process and the charge transfer band have been investigated, respectively.


Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1623
Author(s):  
Anton A. Babaev ◽  
Anastasiia V. Sokolova ◽  
Sergei A. Cherevkov ◽  
Kevin Berwick ◽  
Alexander V. Baranov ◽  
...  

PL intensity quenching and the PL lifetime reduction of fluorophores located close to graphene derivatives are generally explained by charge and energy transfer processes. Analyzing the PL from PbS QDs in rGO/QD systems, we observed a substantial reduction in average PL lifetimes with an increase in rGO content that cannot be interpreted solely by these two processes. To explain the PL lifetime dependence on the rGO/QD component ratio, we propose a model based on the Auger recombination of excitations involving excess holes left in the QDs after the charge transfer process. To validate the model, we conducted additional experiments involving the external engineering of free charge carriers, which confirmed the role of excess holes as the main QD PL quenching source. A mathematical simulation of the model demonstrated that the energy transfer between neighboring QDs must also be considered to explain the experimental data carefully. Together, Auger recombination and energy transfer simulation offers us an excellent fit for the average PL lifetime dependence on the component ratio of the rGO/QD system.


1973 ◽  
Vol 51 (11) ◽  
pp. 1881-1884 ◽  
Author(s):  
R. O. Loutfy ◽  
R. W. Yip

The rate constants for quenching of triplet acetone by a series of halobenzenes have been determined by flash emission technique. Quenching was found to be approximately a hundred times faster than that for triplet benzophenone. For both triplet ketones, quenching did not decrease with the increase in triplet energy difference between ketone and quencher (as expected for normal endothermic triplet energy transfer) and did not correlate with the i.p. of all of the quenchers studied. All of the qualitative features of the quenching results can be simply interpreted in terms of enhanced coupling of the locally excited triplet ketone and quencher states as a result of interaction with the charge transfer state.


Author(s):  
Weidong Qiu ◽  
Xinyi Cai ◽  
Mengke Li ◽  
Liangying Wang ◽  
Yanmei He ◽  
...  

Dynamic adjustment of emission behaviours by controlling the extent of twisted intramolecular charge transfer character in excited state.


2013 ◽  
pp. 143-155
Author(s):  
A. Klepach ◽  
G. Kuranov

The role of the prominent Soviet economist, academician A. Anchishkin (1933—1987), whose 80th birth anniversary we celebrate this year, in the development of ideas and formation of economic forecasting in the country at the time when the directive planning acted as a leading tool of economic management is explored in the article. Besides, Anchishkin’s special role is noted in developing a comprehensive program of scientific and technical progress, an information basis for working out long-term forecasts of the country’s development, moreover, his contribution to the creation of long-term forecasting methodology and improvement of the statistical basis for economic analysis and economic planning. The authors show that social and economic forecasting in the period after 1991, which has undertaken a number of functions of economic planning, has largely relied on further development of Anchishkin’s ideas, at the same time responding to new challenges for the Russian economy development during its entry into the world economic system.


Sign in / Sign up

Export Citation Format

Share Document