Monthly Archives: December 2015

SCIENTISTS DISCOVER NEW SUGAR POLYMER THAT PURIFIES WATER IN JUST SECONDS

Scientists discover new sugar
polymer that purifies water in just
seconds.
Cornell University researchers have
created a
polymer that can remove contaminants
from
flowing water within seconds, and do
so far
more efficiently—and cost-effectively—
than
carbon-based faucet filters, according
to the
American Association for the
Advancement of
Science.
The polymer, a porous form of
cyclodextrin (a
sugar molecule), was developed by a
team of
researchers led by William Dichtel, an
organic
chemist at Cornell University and the
lead
author of the study, which is published
in the
journal Nature.
Running a sample of BPA-contaminated
water through their newly developed
material
and a few activated carbon-type water
filters,
they found that while traditional means
of
water filtration took about 30 minutes
to
reach their maximum absorption, the
porous
cyclodextrin polymer reached 95% of its
absorption capacity in just ten seconds

making it the fastest BPA remover ever
developed.
This stuff is also really cheap to make,
and
the researchers estimate that in the
future, it
could cost little amounts of money to
develop. I hope that this new water
filtration material will be useful in not
only
Industrial water filters, but in the states
water board Nigeria where sand is used
in filter bed.

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CHEMISTS FIND THE END OF SUICIDE BOMBERS FROM BOKO HARAM IN NIGERIA

From BBC news today.
The suicide bombers in the Paris attacks and northern (North East) part of Nigeria are using
an explosive that is relatively easy to
synthesise at home.
Chemists, however, are leading an effort to
develop sensors to sniff it out. How i wish Nigeria chemists also join.
The explosive, called triacetone triperoxide
(TATP), is produced by combining chemicals
sold in pharmacies and hardware stores.
Several research groups across the world are
now developing sensors to detect TATP before
it can be detonated. How i wish Nigeria chemists are also included because suicide bomber is the Alternative for Nigeria terrorists (boko haram) now.
“Anyone who could follow a recipe to make a
pumpkin pie could follow the recipe to make
TATP,” says Dr Kenneth Suslick, professor of
chemistry at the University of Illinois.
That is why terrorists find the chemical so
attractive, say experts. Suicide bombers all
over the world have used TATP, from
Palestinians in the West Bank to the “shoe
bomber” Richard Reid. Even in northern part of Nigeria.
SENSITIVE SENSORS
Chemists are seeking to exploit a physical
characteristic of TATP known as vapour
pressure. This property refers to how readily a
compound converts from the solid to the
gaseous state.
Because TATP has a relatively high vapour
pressure, it easily becomes a gas. Therefore,
in theory, a suicide bomber wearing a vest
containing TATP should emit enough gaseous
particles to set off the alarm on a sensor.
Dr Suslick’s group has developed a handheld
scanner that detects TATP and other
explosives after they react with a colorimetric
sensor array. His work is funded by the US
Department of Defense.
When gaseous TATP molecules enter the
sensor, they encounter a solid acid catalyst.
The acid converts TATP back into its
constituent parts, acetone and hydrogen
peroxide.
Hydrogen peroxide, an unstable oxidising
agent, then reacts with dye molecules in the
sensor, causing them to change colour.
By detecting these colour changes, the highly
sensitive portable scanner can detect fewer
than two parts per billion TATP.
Furthermore, in a recent paper published in
the journal Chemical Science, Dr Suslick’s
team describes a more advanced sensor their
team has created, which uses a panoply of
various color-changing chemical indicators.
This new sensor detects about a dozen
different explosives.
Dr Otto Gregory, professor of chemical
engineering at the University of Rhode Island,
believes that Dr Suslick has developed a good
technology. That has not prevented his lab,
however, from working on its own.
A DIFFERENT APPROACH
Funded by the US Department of Homeland
Security, Dr Gregory’s team has published a
paper in the journal ECS Transactions that
describes an entirely different strategy for
detecting TATP.
Their sensor employs a tin oxide catalyst.
When TATP interacts with the catalyst, it
produces heat that is detected by the sensor.
I hope the present national security adviser will leave no stone unturned in ending suicide bombers in Nigeria when given the fund unlike…