Influence of Microwave Frequency and Power on Nanometal Growth

Ashley, Bridgett; Dyer, Christopher M.; Owens, Jeffery R.; Strouse, Geoffrey F.

doi:10.1021/acs.jpcc.7b11366

Cited by 11 publications

(13 citation statements)

References 67 publications

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“…Total IMFPs were reported with and without a correction for the effects of electron exchange that was based on Ashley's expression. [73] Figure 7e shows the IMFPs of Akkerman and Akkerman, with and without their exchange correction, together with our IMFPs from the FPA, SPA, SSPA, and SSPA*. We see that there is good agreement of the Akkerman and Akkerman IMFPs that include the exchange correction with our SSPA* results for energies between 40 eV and 10 keV; the RMS difference between them is 5.3%.…”

Section: Comparisons With Calculated Imfpssupporting

confidence: 51%

Calculations of electron inelastic mean free paths. XI. Data for liquid water for energies from 50 eV to 30 keV

Shinotsuka

Tanuma

et al. 2016

Surf. Interface Anal.

127

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We calculated electron inelastic mean free paths (IMFPs) for liquid water from its optical energy-loss function (ELF) for electron energies from 50 eV to 30 keV. These calculations were made with the relativistic full Penn algorithm (FPA) that has been used for previous IMFP and electron stopping-power calculations for many elemental solids. We also calculated IMFPs of water with three additional algorithms: the relativistic single-pole approximation (SPA), the relativistic simplified SPA, and the relativistic extended Mermin method. These calculations were made using the same optical ELF in order to assess any differences of the IMFPs arising from choice of the algorithm. We found good agreement among the IMFPs from the four algorithms for energies over 300 eV. For energies less than 100 eV, however, large differences became apparent. IMFPs from the relativistic TPP-2M equation for predicting IMFPs were in good agreement with IMFPs from the four algorithms for energies between 300 eV and 30 keV but there was poorer agreement for lower energies. We calculated values of the static structure factor as a function of momentum transfer from the FPA. The resulting values were in good agreement with results from first-principles calculations and with inelastic X-ray scattering spectroscopy experiments. We made comparisons of our IMFPs with earlier calculations from authors who had used different algorithms and different ELF data sets. IMFP differences could then be analyzed in terms of the algorithms and the data sets. Finally, we compared our IMFPs with measurements of IMFPs and of a related quantity, the effective attenuation length (EAL). There were large variations in the measured IMFPs and EALs (as well as their dependence on electron energy). Further measurements are therefore required to establish consistent data sets and for more detailed comparisons with calculated IMFPs.

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Section: Comparisons With Calculated Imfpssupporting

confidence: 51%

Calculations of electron inelastic mean free paths. XI. Data for liquid water for energies from 50 eV to 30 keV

Shinotsuka

Tanuma

et al. 2016

Surf. Interface Anal.

127

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“…Similarly, Strouse and col. showed that the increase in nanometal growth under microwave irradiation is a question of absorption of electromagnetic radiation and it is depended on the applied power . They considered that this effect was related to thermodynamics and not to non‐thermal microwave effects.…”

Section: Thermal Microwave Effectsmentioning

confidence: 99%

A Critical Overview on the Effect of Microwave Irradiation in Organic Synthesis

Díaz‐Ortiz

Prieto

Hoz

2018

The Chemical Record

154

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Despite the great success of Microwave Assisted Organic Synthesis (MAOS) there is still a lack of knowledge about the interaction of the electromagnetic radiation with matter. In consequence, it has been very difficult to rationalize the effect of microwave irradiation in chemistry, to determine the existence of microwave effects (thermal and non-thermal) and to develop predictive models on the characteristics required for a reaction to be improved under microwaves. This has been a handicap to develop new chemistry under microwave irradiation and the origin of many controversies. This personal account collects some new findings in this field and our work on the use of computational chemistry to develop predictive models and to determine parameters related to thermal and non-thermal effects, with clear advantages over experimental methods where separation of these effect is almost impossible.

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“…The suitable conductivity of the Au NPs layer provided the resonant interaction between the electrons and MWs, leading to the best heating property. For the isolated NPs system, there are only a few reports referring to the insight of the MW heating [30][31][32]. The supported NPs are often highly dispersed on the catalyst support that is also the isolated NPs system.…”

Section: Introductionmentioning

confidence: 99%

Drastic Microwave Heating of Percolated Pt Metal Nanoparticles Supported on Al2O3 Substrate

et al. 2020

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Microwave (MW) heating of supported metal nanoparticles (NPs) presents attractive effects on catalysis such as the rapid heating processes and the enhancement of the reaction rate. Improving the heating property of the NPs, which act as the catalytic active sites, the MW effects will become more significant. Here we show a systematic study about the supported Pt NPs structure to improve the MW heating property. We found that the drastic heating was induced by a percolated Pt NPs structure, where the conduction electrons move around in the two-dimensional network. On the other hand, no heating was observed in an isolated Pt NPs system with the confined electrons. We conclude that the percolation of the Pt NPs giving the network structure is one of the important key factors for the efficient MW heating. The optimized Pt NPs catalyst leads to the dramatic MW effects on catalytic reactions.

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Influence of Microwave Frequency and Power on Nanometal Growth

Cited by 11 publications

References 67 publications

Calculations of electron inelastic mean free paths. XI. Data for liquid water for energies from 50 eV to 30 keV

Calculations of electron inelastic mean free paths. XI. Data for liquid water for energies from 50 eV to 30 keV

A Critical Overview on the Effect of Microwave Irradiation in Organic Synthesis

Drastic Microwave Heating of Percolated Pt Metal Nanoparticles Supported on Al2O3 Substrate

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