Oven with generator on the left middle (vessels in the center) 11mm diameter 11mm diameter 33mm...
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Transcript of Oven with generator on the left middle (vessels in the center) 11mm diameter 11mm diameter 33mm...
Oven with generator on the left Oven with generator on the left middle (vessels in the center)middle (vessels in the center)
11mm diameter11mm diameter 33mm diameter33mm diameter
E Field DistributionE Field Distribution(Input Signal: 2.45GHz, 1 watt)(Input Signal: 2.45GHz, 1 watt)
11mm diameter11mm diameter 33mm diameter33mm diameter
E Field Distribution in MARS Oven E Field Distribution in MARS Oven (DI-Water 25degC)(DI-Water 25degC)
Relationship of Permittivity of Relationship of Permittivity of DI-Water withDI-Water with Temperature Temperature
Measurements of the Precursor Solution at various Measurements of the Precursor Solution at various Temperature (e’)Temperature (e’)
0
10
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0 2 4 6 8 10 12 14 16
Freq [GHz]
Real
Per
mitt
ivit
y
e' (28. 4degC)e' (34. 0degC)e' (38. 7degC)e' (47. 4degC)e' (52. 1degC)e' (56. 0degC)e' (61. 0degC)e' (65. 5degC)e' (69. 9degC)e' (73. 9degC)e' (81. 4degC)
Measurements of the Precursor Solution at various Measurements of the Precursor Solution at various Temperature (e’’)Temperature (e’’)
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0 2 4 6 8 10 12 14 16
Freq [GHz]
Imag
inar
y Pe
rmit
tivi
ty
e' ' (28. 4degC)e' ' (34. 0degC)e' ' (38. 7degC)e' ' (47. 4degC)e' ' (52. 1degC)e' ' (56. 0degC)e' ' (61. 0degC)e' ' (65. 5degC)e' ' (69. 9degC)e' ' (73. 9degC)e' ' (81. 4degC)
Extrapolation of permittivity of Precursor Solution at Extrapolation of permittivity of Precursor Solution at 175degC175degC
e’e’ e’’e’’
Permittivity of the precursor and DI-Permittivity of the precursor and DI-water water
e’e’ e’’e’’ loss tanloss tangent gent (e’/(e’/e’’)e’’)
precursor precursor solution solution
175deg175degC C
81 81 84.6 84.6 1.044 1.044
28degC28degC 39 39 22 22 0.563 0.563
DI-water DI-water 175deg175degCC
39 39 0.386 0.386 0.0099 0.0099
25degC25degC 78 78 10.3 10.3 0.132 0.132
DiscussionDiscussion
Given other same conditionsGiven other same conditions
E field at middle plane of the reactor is higher than the E field at middle plane of the reactor is higher than the bottombottom
E field for precursor is lower than water (due to higher loss E field for precursor is lower than water (due to higher loss tangent of precursor)tangent of precursor)
For water, temperature goes up -> loss tangent goes down For water, temperature goes up -> loss tangent goes down -> E field goes up-> E field goes up
For precursor, temperature goes up -> loss tangent goes up For precursor, temperature goes up -> loss tangent goes up -> E field goes down-> E field goes down
For MARS-5 oven, E field maxima for 33mm reactor is lower For MARS-5 oven, E field maxima for 33mm reactor is lower than 11mm reactorthan 11mm reactor
Power with time of MARS for silicalite synthesisPower with time of MARS for silicalite synthesis
25degC25degC
(at the (at the beginning)beginning)
175degC175degC
(when stable)(when stable)
11mm diameter11mm diameter 600W 600W 90W(averaged) 90W(averaged)
33mm diameter33mm diameter 600W 600W 135W(averaged) 135W(averaged)
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0 100 200 300 400 500 600 700 800 900 1000
Time (s)
Mic
row
av
e P
ow
er
(W)
MARS-5 11 mm diameter
MARS-5 33 mm diameter
Maxima E field in MARSMaxima E field in MARSfor precursor solutionfor precursor solution
Normalized with sqrt(power) Normalized with sqrt(power)
Precursor Solution Precursor Solution E fieldE field
maxima (V/m)maxima (V/m)
bottom of the bottom of the vesselvessel
E fieldE field
maxima (V/m) maxima (V/m)
middle of the vessel middle of the vessel
11 mm 11 mm diameter diameter
175degC 175degC 280 280 950 950
28degC 28degC 1300 1300 3700 3700
33 mm 33 mm diameter diameter
175degC 175degC 140 140 330 330
28degC 28degC 900 900 1300 1300