Chemical Engineering November 2013 - 14

A new material for large-scale energy storage devices
CHEMENTATOR
R
esearchers from the Australian National
University (ANU; Canberra; www.anu.
edu.au), and the University of New South
Wales (Sydney, Australia; www.unsw.edu.
au) claim to have obtained a temperatureand
frequency-independent colossal permittivity
(CP) material with a low dielectric
loss, making it strikingly superior to
typical existing CP materials. " We believe
this work breaks through the logjam associated
with the practical development
of CP materials for use in large capacitors
and high-energy-density storage devices,
as well as providing important new strategies
for the design and development of
new classes of such materials, " says professor
Yun Liu of ANU's Research School
of Chemistry.
Of the many methods employed to develop
materials with those properties, one
approach is to use localized lattice defect
states that can also lead to high-dielectric
permittivity, but with acceptable dielectric
loss and low frequency and temperature
dependence. " The idea is to create local
electron-pinned defect-dipoles within a
parent metal oxide in such a way that the
pinned electron is localized within a few
metal-oxygen polyhedra. As these electrons
have significantly more space for
displacement than atomic electrons, the
resultant defect-dipoles are large and behave
like lattice defect dipoles rather than
free electron hopping. "
To test those predictions, the researchers
selected rutile-type TiO2 as the host.
Both CP and low dielectric loss can be
achieved through the simultaneous incorporation
of donor (for example, Nb+5 ion)
and acceptor substitutions (for example,
In+3 ion) into the TiO2 host structure. The
researchers believe similar CP behavior
can be obtained using other trivalent cation
dopants.
■
(Continued from p. 12)
shear rates and temperatures,
says the company. This will
favorably impact production
rate, polymer quality and pump
lifetime, while reducing energy
consumption by as much as
5-10%, Maag says. The portfolio
is comprised of multiple
sizes, covering throughput
ranges from a few killograms
per hour up to 100 m.t./h.
Greenhouse film
Huntsman Corp. (Wynard, U.K.;
www.huntsman.com) is fi eldtesting
a new application for its
Altiris infrared- (IR) refl ecting
TiO2 pigment in greenhouses
near Istanbul, Turkey. There,
a 50-µm polyethylene (PE)
greenhouse fi lm containing 1%
of Altiris is being used to demonstrate
the pigment's ability to
refl ect IR radiation in order to
keep interior temperatures from
becoming too high. Laboratory
tests have shown that transmission
of 700-2,500 nm IR radiation
is reduced when PE fi lm
contains the pigment. ❏
Circle 16 on p. 172 or go to adlinks.che.com/45778-16
http://www.anu http://www.edu.au http://www.unsw.edu http://www.huntsman.com http://adlinks.che.com/45778-16

Chemical Engineering November 2013

Table of Contents for the Digital Edition of Chemical Engineering November 2013

Contents
Chemical Engineering November 2013 - Cover1
Chemical Engineering November 2013 - Cover2
Chemical Engineering November 2013 - Contents
Chemical Engineering November 2013 - 2
Chemical Engineering November 2013 - 3
Chemical Engineering November 2013 - 4
Chemical Engineering November 2013 - 5
Chemical Engineering November 2013 - 6
Chemical Engineering November 2013 - 7
Chemical Engineering November 2013 - 8
Chemical Engineering November 2013 - 9
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Chemical Engineering November 2013 - 11
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Chemical Engineering November 2013 - 13
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Chemical Engineering November 2013 - 15
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Chemical Engineering November 2013 - 18
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Chemical Engineering November 2013 - 26
Chemical Engineering November 2013 - 27
Chemical Engineering November 2013 - 28
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Chemical Engineering November 2013 - 30
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Chemical Engineering November 2013 - 100
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Chemical Engineering November 2013 - 106
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Chemical Engineering November 2013 - 128
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Chemical Engineering November 2013 - 171
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Chemical Engineering November 2013 - 175
Chemical Engineering November 2013 - 176
Chemical Engineering November 2013 - Cover3
Chemical Engineering November 2013 - Cover4
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