Molecules,
Год журнала:
2024,
Номер
29(24), С. 5990 - 5990
Опубликована: Дек. 19, 2024
Specific
ion
effects
on
the
structure
and
function
of
many
biological
macromolecules,
their
associations,
colloidal
systems,
interfacial
phenomena,
even
“simple”
electrolytes
solutions
are
ubiquitous.
The
molecular
origin
such
phenomena
is
discussed
either
as
a
salt-induced
change
water
(the
hydrogen
bond
network)
or
some
specific
(solvent
mediated)
interactions
one
both
ions
electrolyte
with
investigated
co-solute
(macromolecules
particles).
case
hydrogels
high
interest
but
only
marginally
explored
respect
to
other
physico-chemical
systems
because
they
formed
through
gelling
agents
in
presence
added
electrolyte.
In
addition,
physiological
environment,
which
used
for
biomedical
applications,
may
be
subjected
fluctuations
ionic
environment.
this
review,
properties
(made
from
macromolecules
small-molecular-weight
gelators)
reviewed
discussed.
particular,
importance
binding
molecules
constituting
gel
network
versus
effect
same
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 10, 2024
Hydrogel-based
electronic
devices
in
aquatic
environments
have
sparked
widespread
research
interest.
Nevertheless,
the
challenge
of
developing
hydrogel
electronics
underwater
has
not
been
profoundly
surmounted
because
fragility
and
swelling
hydrogels
environments.
In
this
work,
a
zwitterionic
double
network
comprised
polyvinyl
alcohol
(PVA),
poly(sulfobetaine
methacrylate)
(PSBMA),
sulfuric
acid
(H
Self-healing
hydrogels
can
autonomously
repair
damage,
enhancing
their
performance
stability
and
broadening
applications
as
soft
devices.
Although
the
incorporation
of
dynamic
interactions
enhances
self-healing
capabilities,
it
simultaneously
weakens
hydrogels’
strength.
External
stimuli
such
heating,
while
accelerating
healing
process,
may
also
lead
to
dehydration.
Developing
a
stable
strategy
that
combines
rapid
high
mechanical
strength
is
challenging.
Here,
we
introduce
“salt-welding”
for
high-strength
with
room
temperature
self-healing.
This
achieved
through
borate
ester
bonds
in
salt-responsive
poly(methacrylamide)
hydrogel.
The
process
involves
“salt-fusion”
convert
fractures
into
viscous
liquid
swift
healing,
followed
by
“salt-concretion”
toughen
achieve
posthealing
23
megapascals
95
minutes
at
temperature,
near
100%
efficiency.
Leveraging
tunable
rate,
hydrogel
be
tailored
reparable
wear-resistant
material
damping
device.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Июнь 6, 2024
Abstract
The
further
development
of
aqueous
zinc
(Zn)‐ion
batteries
(AZIBs)
is
constrained
by
the
high
freezing
points
and
instability
on
Zn
anodes.
Current
improvement
strategies
mainly
focus
regulating
hydrogen
bond
(HB)
donors
(H)
solvent
water
to
disrupt
HBs,
while
neglecting
environment
HB‐acceptors
(O).
Herein,
we
propose
a
mechanism
chaotropic
cation‐regulated
HB‐acceptor
via
“super
hydrous
solvated”
structure.
Chaotropic
Ca
2+
can
form
solvated
structure
competitively
binding
O
atoms
in
H
2
O,
effectively
breaking
HBs
among
molecules,
thereby
reducing
glass
transition
temperature
hybrid
1
mol
L
−1
(M)
ZnCl
+4
M
CaCl
electrolyte
(−113.2
°C).
Meanwhile,
hydratability
contributes
water‐poor
,
suppressing
side
reactions
uneven
deposition.
Benefiting
from
anti‐freezing
reversible
anode,
Zn||Pyrene‐4,5,9,10‐tetraone
(PTO)
deliver
an
ultrahigh
capacity
183.9
mAh
g
at
1.0
A
over
1600‐time
stable
cycling
−60
°C.
This
work
presents
cheap
efficient
simultaneously
improve
low‐temperature
performances
stability,
broadening
design
concepts
for
antifreeze
electrolytes.
Macromolecular Rapid Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 30, 2025
Abstract
Crystalline
colloidal
arrays
(CCAs)
composed
of
core–shell
microspheres
with
thermoresponsive
structural
iridescence
governed
by
Bragg's
law
have
garnered
significant
attention
for
diverse
applications.
While
lower
critical
solution
temperature
(LCST)
properties
are
extensively
studied,
upper
(UCST)
counterparts
remain
unexplored,
offering
the
potential
to
expand
application
scope
CCAs.
In
this
study,
poly(N‐acryloyl
glycinamide)
(PNAGA),
a
UCST
homopolymer,
is
employed
first
time
synthesize
microspheres.
By
copolymerizing
NAGA
hydrophilic
co‐monomer
acrylamide
(AM)
form
shell,
soft
shells
capable
assembling
into
CCAs
bright
obtained.
Owing
and
diffraction
wavelength
these
depends
on
concentration,
observation
angle,
temperature.
The
exhibit
behavior,
size
transition
around
14°C.
Upon
heating,
swell,
from
rigid
state,
leading
an
increase
in
interparticle
distance
enhanced
stabilization
ordered
microsphere
packing.
This
process
results
red
shift
intensity
peak.
highlight
their
as
intelligent
temperature‐sensing
materials.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 5, 2025
Abstract
Hydrogels
in
water
or
aqueous
solutions
swell
shrink
unidirectionally
until
reaching
an
equilibrium
state,
which
has
been
extensively
studied
through
both
experimental
analysis
and
theoretical
prediction.
In
this
work,
unexpected
concurrent
swelling
deswelling
behavior
of
hydrogels
is
reported,
manipulates
the
state
polymer
networks.
The
osmotic
pressure‐driven
rapid
ionic
electrostatic
repulsion‐driven
slow
occur
simultaneously,
affording
double‐layered
polyacrylamide
(PAM)
hydrogels,
rigid
inner
layer
does
not
contains
free
water,
while
soft
outer
comprises
bound
water.
PAM
show
uniaxial
tensile
fracture
strengths
Young's
moduli
up
to
104.2
MPa
2.4
GPa,
respectively,
outperforming
various
polymeric
biological
structural
materials.
This
strategy
applicable
general
molding
three‐dimensional
(3D)
printing
techniques,
providing
wide
possibilities
for
engineering
applications.
Such
strong
can
simultaneously
serve
as
materials
load‐bearing
act
functional
super‐stress
(25
6000
N)
highly
adaptable
tactile
sensing.
These
findings
enrich
hydrogel
swell/deswelling
theory
broaden
applications
Foods,
Год журнала:
2025,
Номер
14(4), С. 634 - 634
Опубликована: Фев. 13, 2025
The
gelation
process
and
hydrogel
properties
of
calcium
salt-induced
alginate
hydrogels
are
influenced
by
anion-specific
effects.
In
this
study,
we
investigated
the
effects
CaSO4,
CaI2,
Ca(C5H9O3)2
[calcium
β-hydroxy-β-methylbutyrate,
CaHMB]
on
behavior
hydrogels,
using
various
mannuronic/guluronic
acid
(M/G)
ratios
to
elucidate
underlying
mechanisms
Here,
at
a
high
M/G
ratio
(2:1),
time
as
low-solubility
source,
delayed
formation
hydrogel.
was
1.8
times
that
high-solubility
source
CaHMB.
Strongly
hydrated
ions
(such
SO42-
C5H9O3-)
caused
removal
water
molecules
from
polysaccharide
chains,
resulting
in
small
pores
pore
wall.
Moreover,
weakly
chaotropic
anions
(I-)
promoted
binding
chains
molecules,
slower
thermal
decomposition
inside
gel.
However,
when
reduced
1:1
or
1:2,
influence
three
salts
thermodynamic
decreased,
indicating
effect
weakened.
This
study
highlights
importance
provides
insights
into
utilization
these
fabricate
functional
with
variable
properties.
