Core–Sheath Fibers via Single-Nozzle Spinneret Electrospinning of Emulsions and Homogeneous Blend Solutions
Materials,
Год журнала:
2024,
Номер
17(21), С. 5379 - 5379
Опубликована: Ноя. 4, 2024
The
preparation
of
core–sheath
fibers
by
electrospinning
is
a
topic
significant
interest
for
producing
composite
with
distinct
core
and
sheath
functionalities.
Moreover,
in
fibers,
low-molecular-weight
substances
or
nanosized
inorganic
additives
can
be
deposited
targeted
manner
within
the
sheath.
Commonly,
obtaining
structure,
coaxial
used.
It
requires
spinneret
suitable
immiscible
solvents
inner
outer
solutions.
single-nozzle
emulsions
address
these
issues,
but
use
stabilizing
agent
needed.
A
third
approach—preparation
homogeneous
blend
solutions
two
polymers
polymer/low-molecular-weight
substance—has
been
much
less
studied.
circumvents
difficulties
associated
emulsion
thoroughly
discussed
this
review.
formation
case
attributed
to
phase-separation-driven
self-organization
during
process.
Some
possibilities
core–double
using
same
method
are
also
indicated.
gained
knowledge
on
potential
applications
prepared
discussed.
Язык: Английский
Effects of binary polymer-humic soil amendments on soil carbon cycle and detoxication ability of heavy metal pollution
Chemical and Biological Technologies in Agriculture,
Год журнала:
2024,
Номер
11(1)
Опубликована: Ноя. 29, 2024
Synthetic
hydrophilic
polyelectrolytes
are
considered
as
perspective
tools
to
optimize
soil
properties
and
find
increasing
applications
in
agricultural
technologies.
One
possible
polyelectrolyte-based
conditioner
that
has
shown
promise
for
improving
hydrophysical
is
hydrolyzed
polyacrylonitrile
(HYPAN),
linear
polyanion.
Combinations
of
HYPAN
with
humic
substances
binary
polymer-humic
amendment
presumably
could
provide
a
synergistic
impact.
In
this
study
we
investigated
the
effects
HYPAN,
two
different
potassium
humates
(from
lignite
lignosulfonate),
compositions
ratios
1:1
1:2,
on
microbiological
activity.
We
applied
polymer
solutions
(0.9%
dry
matter
basis)
lab
experiment
examined
how
they
affected
respiration,
microbial
biomass,
metabolic
quotient,
decomposition
rate
constant
soil–polymer
mixtures.
A
concurrent
set
studies
involved
spiking
mixes
heavy
metals
(copper,
zinc,
lead
cadmium).
uncontaminated
mixtures
both
stimulated
activity
microorganisms,
expressed
increased
basal
mitigation
HM
toxicity.
The
formulations
were
comparable
close
size
those
humates.
On
90th
day,
respiration
by
54–77%
alone
30%.
Binary
more
efficient
when
combined
humate
from
lignosulphonate.
maximum
increase
biomass
was
obtained
same
composition
(65
91
µg
C
g−1).
Under
conditions
contamination
at
end
incubation,
levels
parameters
spiked
did
not
statistically
differ
control.
Every
formulation
helped
partially
restore
while
reducing
toxic
HM.
these
circumstances,
itself
combination
performed
better.
quality
organic
primary
determinant
impact
amendments.
Combination
natural
synthetic
their
mitigated
toxicity
present
soil.
This
allows
use
HYPAN-humate
improve
chemical
biological
its
productivity.
Язык: Английский
Effects of Beech Wood Surface Treatment with Polyethylenimine Solution Prior to Finishing with Water-Based Coating
Polymers,
Год журнала:
2024,
Номер
17(1), С. 77 - 77
Опубликована: Дек. 30, 2024
The
surfaces
of
beech
wood
samples
were
treated
with
polyethylenimine
(PEI)
solutions
at
three
different
concentrations—0.5%,
1%
and
2%—and
two
molecular
weights—low
weight
(LMW)
high
(HMW).
effects
PEI
surface
treatment
characterized
by
FT-IR
spectroscopy,
the
penetration
depth
(EPI
fluorescence
spectroscopy),
bonding
position
(by
SEM),
wetting
energy,
water
uptake.
After
treatment,
coated
a
water-based
transparent
acrylic
coating
(WTAC).
dry
film
thickness,
coating,
adhesion
strength
roughness
evaluated.
EPI
SEM
micrographs
showed
that
HMW
chains
deposited
on
surface,
in
contrast
to
LMW,
which
penetrates
deeper
into
layers
cells.
Treatment
solution
resulted
72%
reduction
uptake
(compared
untreated
after
5
min
applying
droplets
surface)
23.2%
energy
samples)
while
maintaining
applied
WTAC.
lower
reduced
is
particularly
important
when
finished
coatings.
Язык: Английский