carbon dielectrics - a new chapter in the electrical ......carbon dielectrics - a new chapter in the...
TRANSCRIPT
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Carbon dielectrics - a new chapter in the
electrical behavior of carbons - with
relevance to energy, conduction, sensing
and EMI shielding
Prof. D.D.L.Chung
University at Buffalo
The State University of New York
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University at Buffalo,
The State University of New York
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British Hong Kong
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Hong Kong
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World War II with the Flying Tigers in China
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First landing on the moon
July 20, 1969
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Caltech 加州理工
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Caltech
加州理工1973
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Pol Dewez,
Father of
amorphous
metals
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ResearchPushing the frontier
of knowledge
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Transportation
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MIT1974
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Professor Mildred S. Dresselhaus, MIT
(1930-2017)
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https://www.periodni.com/gallery/allotropic_forms_of_carbon.png
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Graphite family(sp2 hybridization)
• Graphite
• Graphene
• Carbon fiber/nanofiber/nanotube
• Carbon black
• Activated carbon
• Turbostratic carbon
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https://pubs.rsc.org/en/content/articlelanding/2017/ra/c7ra07489a#!divAbstract
Intercalation of graphite
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Electrical applications of carbons in the graphite family
• Electrochemical electrodes
• Heating elements
• Electrical contacts
• Brushes (sliding electrical contacts)
• Electronic device components
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Electrical applications of carbons in the graphite family
• Electrochemical electrodes
• Heating elements
• Electrical contacts
• Brushes (sliding electrical contacts)
• Electronic device components
Electrical conduction behavior
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Polarization gives an electric dipole.
(separation of the positive and negative charge centers)
Dielectric behavior
- Electric polarization
- Capacitance
- Electric permittivity
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Dielectric behavior
- a new chapter in the electrical behavior of
carbons in the graphite family
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Carbon fiber composites
for aircraft
High modulus, high strength, low density
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American Airlines Flight 587 crashed in New York in 2001
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Interlaminar interface (weak link)
Lamina A
Lamina B
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Contact electrical resistance of
the interlaminar interface
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Effect of through-thickness compression
Carbon fiber epoxy-matrix composite
Wang, Kowalik and Chung, Smart Mater Struct (2004).
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Effect of through-thickness compression
Carbon fiber nylon-matrix composite
Wang, Kowalik and Chung, Smart Mater Struct (2004).
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2D spatially
resolved sensing
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Smart concreteConcrete itself is a sensor.
Resistance-based
self-sensing
Invented in 1993
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With carbon fiber
Tension
Thin
curve
Thick
curve
Wen and Chung, Cem Concr Res (2000).
Volume resistance
Effect of tension on the resistivity of cement with short carbon fiber
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Without carbon fiber
Tension
Without fiber
Wen and Chung, Cem Concr Res (2000).
Volume resistance
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Managing
the energy
usage of a
building
according to
the room
occupancy
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Autonomous
vehicles
Traffic monitoring
Conventional wireless technology
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http://www.leancrew.com/all-this/images2010/well.png
Oil/gas wellsGeothermal wellsCarbon sequestration wells
Oil spillhttps://phys.org/news/2010-06-storm-theatens-gulf-mexico-oil.html
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Multifunctional structural materials
• The material serves structural and non-structural functions (e.g., self-sensing).
• No device involved (low cost, high durability, no mechanical property loss)
• Design simplification
• Large functional volume
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0 10 20 3012400
12600
12800
13000
13200
13400
13600
30 20 10 00 20 40 6060 40 20 00 25 50 75 100100 75 50 25 0
κ
Stress (MPa)
κ
Fractional increase
0
2
4
6
8
10
Fracti
on
al
increase i
n κ
(%
)
Effect of tension in the fiber direction on the resistivity and permittivity κ
Xi and Chung, Carbon (2020).
0 10 20 30
2.7
2.8
2.9
3.0
3.1
3.2
30 20 10 00 20 40 6060 40 20 00 25 50 75 100100 75 50 25 0
Resi
stiv
ity
(1
0-4
Ω.m
)
Stress (MPa)
Resistivity
Fractional increase
0
4
8
12
16
20
Fracti
on
al
increase i
n r
esi
sti
vit
y (
%)
Resistance-based stress self-sensing
(piezoresistivity)
Capacitance-based stress self-sensing
(piezopermittivity)
Continuous carbon fiber polymer-matrix composite
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Electrode
Fiber direction
Electrode
222.6
25.60 25.60
25
.60
22
2.6
25
.60
222.6
Electrode Electrode
Fiber direction
25.60 25.60
22
2.6
25
.60
25
.60
Capacitance-based damage self-sensing of carbon fiber
polymer-matrix composite using coplanar electrodes
Parallel Perpendicular
Eddib and Chung, Carbon (2018).
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0.9650
0.9700
0.9750
0.9800
0.9850
0.9900
0.9950
1.0000
0 20 40 60 80 100 120
Case No.
C/C°
Parallel
Perpendicular
Relates to No. of holes in the composite
Eddib and Chung, Carbon (2018).
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Electrode
Fiber direction
Electrode
222.6
25.60 25.60
25
.60
22
2.6
25
.60
222.6
Electrode Electrode
Fiber direction
25.60 25.60
22
2.6
25
.60
25
.60
Capacitance-based damage self-sensing of carbon fiber
polymer-matrix composite using coplanar electrodes
Parallel Perpendicular
Eddib and Chung, Carbon (2018).
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Pitfall of capacitance measurement
• Assuming that an LCR meter applies to a conductive material in the same way as a non-conductive material
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Capacitance measurement
using the parallel-plate capacitor configuration
C = εo κA/l
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Add a dielectric (insulating) film between the specimen and the electrode
for measuring the permittivity, but not for measuring the resistivity.
Solution
Electrical insulator
Specimen
Electrode
Electrical insulator
Specimen
Electrode
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Volume and contact capacitance in series: 1/C = 1/Cv + 2/Ci
Thus, volumetric and interfacial contributions are decoupled.
Slope gives relative dielectric constant
1/C = l /(εo κ A) + 2/Ci
Intercept gives interfacial capacitance
Three thicknesses
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Capacitance-based self-sensing of
carbon fiber composites implies that the
composites are conductive dielectrics.
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C
-
+ I
(Pulse)
I
(Continuous)R
+
-
DC current pulse only.AC current if there is a time-varying stimulus
Continuous DC current.Time-varying stimulus not required.
C refers to the capacitor. R refers to the resistor. I refers to the current.
Nonconductive dielectric(capacitor)
Conductive dielectric(resistor)
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I
(Continuous)R
+
-
Continuous DC current.Time-varying stimulus not required.
R refers to the resistance. I refers to the current.
Conductive dielectric (conductor that is polarizable)
This requires electron-atom interaction, which is enhanced by defects, such as grain boundaries.
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+ -
+-
Time
Ap
pa
ren
t re
sis
tan
ce
True resistance
R1
Polarity
reversal
R2
Time
Ap
pa
ren
t re
sis
tan
ce
True resistance
R1
Polarity
reversal
R2
The average of R1 and R2 equals the true resistance.
Polarization under a DC current
Depolarization upon polarity reversal
Polarization impedes DC conduction
increasing the apparent resistivity.
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0 100 200 300 400 500 600 700 800 900-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
1mA
5mA 10mA20mA
Fra
ctio
na
l ch
an
ge
in a
pp
are
nt
resi
stiv
ity
(%
)
Time (s)
40mA
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
Fra
ctio
na
l ch
an
ge
in e
lect
ric
fiel
d (
%)
Graphite
Chung and Xi, Carbon (2021).
Depolarization is slower and less than polarization, due to electrical asymmetry.
Polarization
Depolarization
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https://www.science.org.au/curious/technology-future/batteries
The electrodes of a battery can undergo polarization, increasing their apparent resistivity.
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https://medium.com/@danielrom/whats-going-on-with-the-graphite-electrodes-8ea80936c81a
https://refractoriesmaterials.com/graphite-electrodes-for-sale/
Large graphite
electrochemical electrodes
for aluminum production
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Graphite heating elements
https://www.graphitemachininginc.com/vacuum-furnace-industry.htmlhttps://www.graphite-eng.com/applications/
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https://www.alibaba.com/product-detail/China-custom-carbon-graphite-strip-for_60757048471.html
https://kitairu.net/minerals-and-metallurgy/metals-and-metal-products/nonferrous_and_rare_metals/non_metallic_minerals/non_metallic_mineral_products/graphite_products/541713.html
Graphite brushes
(sliding electrical contacts)
Pantographs
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0 2 4 6 8 10 120
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
♠
AR-08 (Mersen)♠
★♥
AR-14 (Mersen)♣
♣●
▲
■
Rela
tiv
e p
erm
itti
vit
y
Grain size (μm)
■ ZXF-5Q (Entegris)▲ TTK-4 (Toyo Tanso)
● AXF-5Q (Entegris)
★ AR-06 (Mersen)
♥ AR-12 (Mersen)
0.0 0.2 0.4 0.6 0.8 1.00
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
♠★♥
♣●
▲
■
Rel
ativ
e p
erm
itti
vity
1/grain size (μm)
■ ZXF-5Q (Entegris)▲ TTK-4 (Toyo Tanso)
● AXF-5Q (Entegris)
♣ AR-14 (Mersen)
♥ AR-12 (Mersen)
★ AR-06 (Mersen)
♠ AR-08 (Mersen)
Polycrystalline graphite
Effect of the grain size on the
permittivity
Electron-atom interaction occurs at
the grain boundaries, with the
strength of the interaction
independent of the grain size.
Xi and Chung (2021)https://www.carbon.co.jp/english/products/specialty/
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GraphiteA decrease in the grain size
greatly increases the
permittivity, but increases the
resistivity slightly. (Xi and
Chung, 2021)
Carbon fiber (along the fiber axis)
An Increase in the degree of
graphitization decreases the
resistivity greatly, but increases
the permittivity much less.
(Eddib and Chung, 2019)
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20 30 40 50 60 70500
550
600
650
700
70 60 50 40 30 20
Relative permittivity
Rela
tive p
erm
itti
vit
y
Heating
Fractional increase
Temperature (C)
Cooling
0
5
10
15
20
25
30
35
40
Fracti
on
al
increase
in
rela
tiv
e p
erm
itti
vit
y (
%)
Graphite (25-μm grain size)
Permittivity and resistivity increase with temperature for graphite.
- No Curie effect
Permittivity decreases with temperature for nonconductive dielectrics.
- Curie effect
Pyropermittivity(not pyroelectricity)
Heating increases the permittivity reversibly.
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0.0 0.1 0.2 0.3530
540
550
560
570
580
590
600
0.3 0.2 0.1 0.00.0 0.1 0.2 0.3 0.3 0.2 0.1 0.00.0 1.0 2.0 2.0 1.0 0.00.0 1.0 2.0 2.0 1.0 0.00.0 2.0 4.0 6.0 6.0 4.0 2.0 0.00.0 2.0 4.0 6.0 6.0 4.0 2.0 0.0
Rela
tiv
e p
erm
itti
vit
y
Stress (MPa)
Relative permittivity
Fractional increase
0
2
4
6
8
10
12
14
Fra
cti
on
al
increa
se (
%)
Piezopermittivity
(not piezoelectricity)
Graphite (25-μm grain size)
Tensile stress increases the permittivity reversibly.
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Electret
Permanent electric dipole
Electret – material with a permanent electric dipole
Electric field
associated with
an electret
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The H2O molecule is a permanent electric dipole,
which is thermodynamically stable.
https://socratic.org/questions/5674189d11ef6b3382d73f32
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Conventional electret True electret
Requires poling. Does not require poling.
Polarized state is
thermodynamically unstable.
(Low entropy)
Polarized state is
thermodynamically stable.
(Low enthalpy)
Depoles spontaneously after
poling.
Does not depole
spontaneously.
Depolarized state is
thermodynamically stable.
(High entropy)
Depolarized state is
thermodynamically unstable.
(High enthalpy)
True electret can serve as an energy source
that does not need energy input during
charge – self-charge. (Patent pending)
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0.0 0.1 0.2 0.3
1.2
1.3
1.4
1.5
1.6
1.7
1.8
0.3 0.2 0.1 0.00.0 0.1 0.2 0.3 0.3 0.2 0.1 0.00.0 1.0 2.0 2.0 1.0 0.00.0 1.0 2.0 2.0 1.0 0.00.0 2.0 4.0 6.0 6.0 4.0 2.0 0.00.0 2.0 4.0 6.0 6.0 4.0 2.0 0.0
Ele
ctr
ic f
ield
(1
0-5
V/m
)
Stress (MPa)
Electric field
Fractional increase
0
10
20
30
40
50
60
70
Fracti
on
al
increase i
n e
lectr
ic f
ield
(%
)
Piezoelectret
(not piezoelectricity)
Graphite (25-μm grain size)
Tensile stress increases the electric field.
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Charge-discharge testing results for 37.0% cold-worked copper
Charge-discharge behavior (graphite, 1 μm grain size)
Xi and Chung. Carbon (2021); Smart Mater Struct (2019).
0 100 200 300 4000.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0 100 200 300 400
ChargeDischarge
|E2| (1
0-4
V/m
)
Time (s)
0
1
2
3
4
5
6
7
8
9
J2 (
A/m
2)
Short-circuited Open-circuited
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-+
pn
Electric field enables discharge
current, so no bias is necessary.
Electret
- +
Electrons
Electrons
pn-junction
Electric field is against the forward
current, so forward bias is necessary.
-+
pn
Electric field enables discharge
current, so no bias is necessary.
Electret
- +
Electrons
Electrons
pn-junction
Electric field is against the forward
current, so forward bias is necessary.
Natural
true
electret
Artificial
true
electret
Bias is not suitable for providing energy.
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Energy issues
• The greenhouse gas emission associated with the burning of fossil fuels
• The environmental pollution associated with the disposal of batteries and supercapacitors
• The fire hazard of some batteries and supercapacitors
• The inadequate safety of nuclear reactors
• The high cost of photovoltaics (solar cells)
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Batteries
causing fire
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https://www.westborotoyota.com/toyotas-scientists-create-intelligent-battery-with-magnesium/
Battery discharge (spontaneous)
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Battery recharging limiting the travel
distance and vehicle utilization
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Batteries take up volume and weight,
limiting payload and increasing fuel need.
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Supercapacitor
https://energyeducation.ca/encyclopedia/Supercapacitor
Discharge is spontaneous.
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https://www.smithsonianmag.com/innovation/lets-build-cars-out-batteries-180970693/
Battery incorporation weakens a structure.
Battery life is much shorter than the required service life of the structure.
Structural battery or capacitor (Chung, 1st report, 2001)
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Issues with structures rendered self-powering by
device embedment
• Inadequate service life and inadequate safety for structural batteries and structural supercapacitors
• Inadequate self-powering performance
• Inadequate mechanical performance
• High cost
• Technology not applicable to existing structures
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Vertical take off and landing
(all electric, high agility)
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Air taxi, air metro, last-mile delivery
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Electret
Permanent electric dipole
Electret – material with a permanent electric dipole
Electric field
associated with
an electret
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The electric field changes sign upon polarity reversal and increases
linearly in magnitude with increasing inter-electrode distance l.
This means that the voltage relates to l2.
Graphite (25 μm grain size)
Xi and Chung, Carbon (2021).
E1
E2
Before polarity reversal
After polarity reversal
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0 200 400 600 800 1000 1200 14000
20
40
60
80
100
120
140
Ele
ctri
c fi
eld
(10
-6 V
/m)
l (m)
Copper
Xi and Chung, Smart Mater Struct, 2019.
The linearity is valid even at very large distances.
Up to 1280 m
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The charge magnitude Q at each
end of the dipole increases linearly
with decreasing grain size.
The electric field is governed more
by the resistivity than the
permittivity.
Graphite
0 2 4 6 8 10 122.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
|E2| (
10
-5 V
/m)
Grain size (μm)
Resistivity increases
linearly with
decreasing grain size.
0 2 4 6 8 10 120
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
♠
AR-08 (Mersen)♠
★♥
AR-14 (Mersen)♣
♣●
▲
■
Rela
tiv
e p
erm
itti
vit
y
Grain size (μm)
■ ZXF-5Q (Entegris)▲ TTK-4 (Toyo Tanso)
● AXF-5Q (Entegris)
★ AR-06 (Mersen)
♥ AR-12 (Mersen)
The electret’s electric
field (l fixed at ~16 mm)
increases linearly with
decreasing grain size.
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0 5 10 15 20 25 30 35 400
1
2
3
4
5
Inh
eren
t E
lect
ric
fiel
d (
10
-5 V
/m)
Prior cold work (%)
The electret is enhanced by cold work (rolling), as shown for copper.
The positive end of the
electret’s voltage located
where the rolling-induced
plastic flow originates.
The electret is enhanced by cold
work (rolling), as shown for copper.
The scientific origin of true electrets relates to the inherent electrical asymmetry
in the material. This asymmetry stems from the directional nature of the material
fabrication (e.g., extrusion, drawing, rolling, pressing, etc.).
Xi and Chung, submitted.
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Charge-discharge testing results for 37.0% cold-worked copper
Charge-discharge behavior (graphite, 1 μm grain size)
I
Discharge
Charge
t
Shaded area =
charge involved
Xi and Chung, Carbon (2021); Smart Mater Struct (2019).
0 100 200 300 4000.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0 100 200 300 400
ChargeDischarge
|E2| (1
0-4
V/m
)
Time (s)
0
1
2
3
4
5
6
7
8
9
J2 (
A/m
2)
Short-circuited Open-circuited
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Grain
size
(μm)
Relative
permittivity
(2 kHz)
Energy
density
(J/m3)
Fraction of
carriers that
participate
Discharge time
per unit
participating
charge (s/C)
25 5.3×102 5.2×10-1 4.9×10-4 3.6×105
1 5.1×103 8.2×105 9.3×10-2 1.3×103
True-electret-based energy density (scaled to inter-electrode
distance l = 1400 mm) and related properties of graphite
The grain size reduction increases the energy density and the fraction of carriers
that participate, and shortens the discharge time per unit participating charge.
The fraction of carriers that participate in the permittivity is lower than the fraction
of carriers that participate in electret discharge by 9 orders of magnitude.
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Relative
permit-
tivity
(2 kHz)
Energy
density
(J/m3)
Fraction of
carriers
that
participate
Discharge time
per unit
participating
charge (s/C)
Uncoated 1.2×104 7.2 1.3×10-3 4.8×106
Nickel-
coated
6.3×104 3.1×102 3.4×10-5 3.1×104
True-electret-based energy density (scaled to inter-electrode
distance l = 1400 mm) and related properties of carbon fibers
Carbon fiber
The nickel coating increases the energy density, decreases the fraction of carriers
that participate, and shortens the discharge time per unit participating charge.
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Grain
size
(μm)
Relative
permittivity
(2 kHz)
Energy
density
(J/m3)
Fraction of
carriers that
participate
Discharge time
per unit
participating
charge (s/C)
25 5.3×102 5.2×10-1 4.9×10-4 3.6×105
1 5.1×103 8.2×105 9.3×10-2 1.3×103
True-electret-based energy density (scaled to inter-electrode
distance l = 1400 mm) and related properties of graphite
The grain size reduction increases the energy density and the fraction of carriers
that participate, and shortens the discharge time per unit participating charge.
The fraction of carriers that participate in the permittivity is lower than the fraction
of carriers that participate in electret discharge by 9 orders of magnitude.
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Fraction of carriers that participate in true electret (graphite)
• 9 orders higher than that for permittivity (capacitance)
• 14 orders higher than that for current-induced
polarization (increase in the apparent resistivity)
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Need to tailor carbons for electret-based energy generation
Processing-structure-property relationships
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20 40 600.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
60 40 20 20 40 60 60 40 20
Heating
E1
E1 (
10
-3 V
/m)
Temperature (℃)
Fractional increase
HeatingCooling Cooling
0
2
4
6
8
10
12
14
Fra
ctio
n i
ncr
ease
in
E1
Electric field increases by 1100% upon heating to 70°CGraphite (1 μm grain size)
20 40 600.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
60 40 20 20 40 60 60 40 20
CoolingCoolingHeating
Resistivity
Res
isti
vit
y (
10
-5 Ω
.m)
Temperature (℃)
Fractional decrease
Heating0
10
20
30
40
50
60
70
80
Fra
ctio
na
l d
ecre
ase
in
res
isti
vit
y (
%)
Pyroelectret
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20 40 600
20
40
60
80
100
120
140
160
60 40 20 20 40 60 60 40 20
CoolingHeating
Current density
Cu
rren
t d
en
sity
(A
/m2)
Temperature (℃)
Fractional increase
Heating Cooling0
10
20
30
40
50
60
Fracti
on
al
increase
in
cu
rren
t d
en
sity
Current density increases by 5000% upon heating to 70°C
Graphite (1 μm grain size)
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0 50 100 1500.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0 200 400 600
E1 (
10
-3 V
/m)
Time (min)
Electric field
Temperature
Short-circuit condition
Time (min)
20
30
40
50
60
70
80
Tem
per
atu
re (
℃)
Graphite at 70°C
Open circuit
The electret is so strong that the electrical disturbance upon short-
circuiting is small, so that the thermodynamic driving force for discharge
is small and the discharge is slow, with a long incubation time; similarly,
charge is slow.
~18 hours before the discharge starts
~25 hours when the discharge finishes
Incubation time ~18 h
Discharge / charge time ~ 7 h
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Charge-discharge testing results for 37.0% cold-worked copperGraphite at 20°C
0 100 200 300 4000.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0 100 200 300 400
ChargeDischarge
|E2| (1
0-4
V/m
)
Time (s)
0
1
2
3
4
5
6
7
8
9
J2 (
A/m
2)
No incubation period
Discharge / charge time = 400 s
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Electrons
- +
Forward bias (promotes discharge)
Electrons
Reverse bias (promotes charge)
+-
Electret
Bias is not suitable for providing energy.
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0 400 8000.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0 400 800 0 400 800 0 400 800 0 400 800 0 400 800
Time (s)
|E2| (1
0-5
V/m
)
Discharge Discharge DischargeChargeCharge Charge
0.0
0.2
0.4
0.6
0.8
1.0
1.2
|J2| (1
02 A
/m2)
30 60 90 120 150 180 2102.22
2.24
2.26
2.28
2.30
2.32
Ele
ctri
c fi
eld
(1
0-5
V/m
)
l (mm)
Low carbon steell = 18.1 mm
Energy density for a single
discharge, with l = 1400 mm,
Steel: 9.1×104 J/m3
Graphite (1 μm grain size): 8.2×105 J/m3
37% cold worked copper:2.2×105 J/m3
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Steel-reinforced concrete
With 10 discharges per day, a structure comprising 100 steel rebars of
length 60 ft and diameter 1.27 inch provides 3.2 GJ, i.e., all of the daily
energy need of 2.8 average U.S. households.
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Zero-energy buildings
Residential and commercial buildings account for
nearly 40% of the nation’s total energy demand.
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The life-cycle cost of using steel is estimated to be
1% of that of solar energy.
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Many buildings in a city for providing steel
for energy generation
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Electric car
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Vertical take off and landing
(all electric, high agility)
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Structural energy
• Energy generated by structures that are
conductive dielectrics and true electrets
(patent pending)
• Structural materials include metals and carbons.
• A new untapped form of energy
• No energy storage needed.
• No greenhouse gas emission
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Carbon fiber composite
for computer case
capable of
electromagnetic
interference (EMI)
shielding
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https://static-defendershield.netdna-ssl.com/wp-content/uploads/sources-emf.jpg
Electromagnetic radiation sources
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Stealth
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“Flexible graphite”
is compressed
exfoliated graphite.
Structure formed by mechanical interlocking of
exfoliated graphite particles (no binder)
130 dB at 1 GHz
Luo and Chung, Carbon (1996).
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Intercalated, but before exfoliation
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After exfoliation
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Exfoliated graphite
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“Flexible graphite”
is compressed
exfoliated graphite.
Structure formed by mechanical interlocking of
exfoliated graphite particles (no binder)
130 dB at 1 GHz
Luo and Chung, Carbon (1996).
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Absorption contribution = SEA/SET
SEA>> SER
Flexible graphite of thickness 0.13 mm
• Dielectric
• High specific surface area
• Conductive
• Resilience
Guan and Chung, Carbon (2020).
Radio wave and microwave regimes
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Scientific pouring
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https://www.fearlessmotivation.com/2019/03/28/breakthrough-motivational-video/
Not just an incremental advance, but is transformative.
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https://www.resourcesforleading.com/blog/2015/07/success-at-last-stepping-out-of-the-box/
Think out of the box
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https://medium.com/@rtaori60/leader-or-follower-2885adc7f92b
Be a leader, not just a follower
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Sustained
work
https://innovationmanagement.se/2005/06/09/7-strategies-for-sustained-innovation/
Chung
Google Scholar
H-index = 98
Citations: 34603
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Professor Mildred S. Dresselhaus, MIT (1930-2017)
Dresselhaus
Google Scholar
H-index = 187
Citations: 211,122
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https://info.wartburg.edu/Pathways/Discover-Your-Vocation/Definition-of-Vocation
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IQ -- Intelligence Quotient
EQ – Emotional Quotient
SQ – Spiritual Quotient
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4 generations of carbon scientists at Carbon 2016 Conference
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2018 book dedicated to the memory of Prof. M.S. Dresselhaus
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In memory of Professor M.S. Dresselhaus
July 2016
D.D.L. Chung, "Mildred S. Dresselhaus (1930-2017)", Nature 543, 316 (2017).