Journal of Chemical Education,
Год журнала:
2024,
Номер
102(1), С. 270 - 280
Опубликована: Дек. 13, 2024
The
academic
community
increasingly
embraces
the
possibilities
offered
by
Maker
movement,
with
a
notable
rise
in
creation
of
homemade
instruments,
particularly
field
spectroscopy.
These
instruments
are
being
leveraged
to
enhance
engagement
classes
and
educational
projects.
Most
these
designed
for
purposes
rely
on
simplified
3D-printed
components
and/or
adapted
materials,
such
as
compact
discs
used
diffraction
gratings.
This
article
proposes
yet
another
solution
recycling
an
optical
system
from
old
liquid
chromatograph
decommissioned
due
obsolete
communication
protocols.
entire
instrument's
is
used,
original
photodiode
array
(PDA)
was
replaced
modern
PDA
that
could
be
easily
controlled
Arduino
user
interface
developed
this
intent.
A
flowchart
illustrating
operations
related
absorbance
calculations
presented,
followed
discussion
how
shape
acquired
spectra
may
influenced
positioning
sensor.
raw
data
obtained
work
can
also
utilized
teach
concepts
dark
current,
baseline
correction,
instrument
calibration,
absorbance.
visible
several
substances
resultant
presented
compared
those
commercial
benchtop
spectrophotometer.
approach
described
here
inspire
recovery
other
outdated
providing
opportunities
explore
both
physical
computational
aspects
chemical
instrumentation.
Journal of Chemical Education,
Год журнала:
2024,
Номер
101(11), С. 5077 - 5081
Опубликована: Окт. 9, 2024
The
vivid
colors
of
visible
spectroscopy
are
amenable
to
classroom
activities
where
students
can
view
a
demonstration
and
make
observations.
Here
we
report
an
active
learning
in-class
activity
that
combines
both
absorption
luminescence
spectroscopy.
is
based
on
outreach
involving
glowing
gelatin
dessert.
Students
use
absorbance
spectra
determine
the
optimal
color
prepare
brightest
most
impactful
demonstration.
During
activity,
learn
difference
between
emission
relationship
λmax
observed
solution
color,
they
consider
preparing
for
activities.
Surveys
assessment
demonstrated
enjoyed
reinforced
these
concepts
contributed
topics.
Instructors
may
implement
this
with
or
without
demonstration,
as
worksheet
photos
provided.
ACS Omega,
Год журнала:
2024,
Номер
9(46), С. 46600 - 46609
Опубликована: Ноя. 7, 2024
Congo
red
is
toxic
to
humans
and
the
environment
persists
in
for
long
periods.
Therefore,
developing
a
rapid
detection
method
crucial.
In
this
study,
iron
oxide
quantum
dots
(IOQDs)
were
synthesized
employed
dual-mode
(colorimetric
smartphone-based)
of
real
samples.
Upon
mixing
with
red,
IOQDs
induce
color
change
solution
due
strong
intermolecular
interactions
between
IOQDs,
making
them
practical
as
colorimetric
sensors.
To
further
increase
on-site
capabilities
images
sensor
platform
captured
using
smartphone,
data
analyzed
dedicated
APP.
As
sensor,
ultraviolet-visible
(UV-vis)
absorbance
response
exhibited
good
linearity
concentrations
2
50
μM,
limit
0.89
μM.
The
smartphone-based
also
provided
highly
quantitative
results,
showing
linear
relationship
blue-to-red
(B/R)
channel
ratio,
0.58
Moreover,
demonstrated
better
selectivity
than
other
sensors,
even
presence
dyes.
proposed
convenient,
fast,
low-cost,
suitable
real-sample
applications.
ACS Omega,
Год журнала:
2024,
Номер
9(50), С. 49441 - 49451
Опубликована: Дек. 2, 2024
To
examine
the
water-induced
photoluminescence
turn-on
and
its
potential
application
in
trace
water
sensing,
a
new
series
of
[LnIII(dmba)3(H2O)2]·2H2O,
where
LnIII
=
LaIII
(I),
PrIII
(II),
NdIII
(III),
SmIII
(IV),
EuIII
(V),
GdIII
(VI),
TbIII
(VII),
DyIII
(VIII),
HoIII
(IX),
ErIII
(X),
were
synthesized
using
dimethoxybenzoic
acid
(Hdmba).
Their
single-crystal
structures
thermal
chemical
robustness
investigated,
effects
lanthanide
contraction
noncovalent
interactions
discussed.
The
colorimetric
properties
I–X
investigated.
dependence
on
dehydration
rehydration
was
disclosed,
from
which
significant
role
proposed.
Based
dehydration–rehydration-dependent
responses
forms
emission
color,
turn-off
(dehydration)
(rehydration)
red
(V)
demonstrated.
Using
mobile
phone
camera
freeware
application,
use
sensing
polar
organic
solvents
successfully
achieved.
With
respect
to
ethanol,
acetonitrile,
acetone,
linear
correlations
established
0
3–5%
by
volume
with
an
R2
over
0.98.
detection
quantification
limits
less
than
0.5
1.5%,
respectively.
percentage
recoveries
92
110%.
underlying
mechanism
postulated.
Journal of Chemical Education,
Год журнала:
2024,
Номер
102(1), С. 270 - 280
Опубликована: Дек. 13, 2024
The
academic
community
increasingly
embraces
the
possibilities
offered
by
Maker
movement,
with
a
notable
rise
in
creation
of
homemade
instruments,
particularly
field
spectroscopy.
These
instruments
are
being
leveraged
to
enhance
engagement
classes
and
educational
projects.
Most
these
designed
for
purposes
rely
on
simplified
3D-printed
components
and/or
adapted
materials,
such
as
compact
discs
used
diffraction
gratings.
This
article
proposes
yet
another
solution
recycling
an
optical
system
from
old
liquid
chromatograph
decommissioned
due
obsolete
communication
protocols.
entire
instrument's
is
used,
original
photodiode
array
(PDA)
was
replaced
modern
PDA
that
could
be
easily
controlled
Arduino
user
interface
developed
this
intent.
A
flowchart
illustrating
operations
related
absorbance
calculations
presented,
followed
discussion
how
shape
acquired
spectra
may
influenced
positioning
sensor.
raw
data
obtained
work
can
also
utilized
teach
concepts
dark
current,
baseline
correction,
instrument
calibration,
absorbance.
visible
several
substances
resultant
presented
compared
those
commercial
benchtop
spectrophotometer.
approach
described
here
inspire
recovery
other
outdated
providing
opportunities
explore
both
physical
computational
aspects
chemical
instrumentation.
