Optics Express,
Год журнала:
2023,
Номер
31(15), С. 24054 - 24054
Опубликована: Май 30, 2023
We
use
THz
probe
pulses
to
detect
and
analyze
the
dynamics
of
charge
transport
anisotropies
generated
by
ultrafast
laser
two-photon
absorption
in
Zinc
Telluride
(ZnTe)
semi-insulating
crystal
showing
smooth
structured
surfaces.
The
detected
anisotropy
consists
a
modulation
transmission
as
function
orientation
<001
>
axis
ZnTe.
change
after
pump
excitation
is
attributed
free
carrier
field
laser-induced
electron-hole
plasma.
Pre-structuring
surface
sample
with
periodic
structures
(ripples)
has
strong
influence
on
its
associated
anisotropic
oscillation.
Within
relaxation
carriers,
two
times
have
be
considered
order
correctly
describe
dynamics,
fast
relaxation,
about
50
picoseconds
pristine
(90
pre-structured
ripples),
slow
one,
1.5
nanoseconds.
A
theoretical
model
based
classical
Drude
theory
dependence
coefficient
polarization
used
fit
experimental
results.
The Saudi Dental Journal,
Год журнала:
2023,
Номер
35(2), С. 111 - 124
Опубликована: Янв. 5, 2023
The
aim
of
this
systematic
review
was
to
present
the
current
knowledge
on
influence
laser
surface
treatment
adhesion
bacteria
titanium
and
its
alloys.This
structured
according
PRISMA
guidelines
for
reviews
meta-analyses,
registered
Open
Science
Framework
platform
(https://doi.org/10.17605/OSF.IO/FTA3W).
Article
searches
were
performed
in
4
databases:
PubMed,
Scopus,
Embase,
Direct.
In
addition,
a
manual
search
reference
lists
selected
articles.
selection
articles
by
two
reviewers.
found
screened
eligibility
using
previously
established
inclusion
exclusion
criteria.
methodological
quality
studies
assessed
Joanna
Briggs
Institute
(JBI)
Critical
Assessment
Checklist
Quasi-Experimental
Studies
(non-randomized
experimental
studies).Most
evaluated
showed
that
irradiation
can
affect
surfaces
is
directly
related
changes
properties
such
as
chemical
composition,
morphology,
roughness,
wettability,
well
type
bacterial
species
involved.The
considered
have
shown
promising
technique
reduce
implants.
Applied Sciences,
Год журнала:
2023,
Номер
13(10), С. 6276 - 6276
Опубликована: Май 20, 2023
Laser
surface
treatment
conducted
at
different
power
levels
is
an
option
to
modify
titanium
bone
implants
produce
nano-
and
microtopography.
However,
such
processing
can
lead
excess
mechanical
stress
within
the
layer.
This
research
aims
calculate
level
of
residual
stresses
after
Ti
grade
IV,
Ti15Mo,
Ti6Al7Nb
alloys
with
Nd:YAG
laser.
Light
scanning
electron
microscopies
(SEM),
energy-dispersive
X-ray
spectroscopy
(EDS),
diffractometry
(XRD),
optical
profilography,
nano-indentation
tests
were
applied
characterize
zone.
The
laser
resulted
in
a
distinct
pattern
formation
remelted
zones
66–126
µm
thick,
roughness
values
ranging
between
0.22
1.68
µm.
properties
weakly
dependent
on
material
composition.
caused
by
moderate,
always
tensile,
increasing
loading,
was
highest
for
Ti15Mo
alloy.
Scientific Reports,
Год журнала:
2023,
Номер
13(1)
Опубликована: Сен. 23, 2023
Abstract
Dental
implant
failure
is
primarily
due
to
peri-implantitis,
a
consequence
of
bacterial
biofilm
formation.
Bacterial
adhesion
strongly
linked
micro-/nano-topographies
surface;
thus
an
assessment
surface
texture
parameters
essential
understand
adhesion.
In
this
study,
mirror
polished
titanium
samples
(Ti6Al4V)
were
irradiated
with
femtosecond
laser
(fs-L)
at
wavelength
1030
nm
(infrared)
variable
(laser
beam
polarization,
number,
spacing
and
organization
the
impacts).
Images
3-D
topographies
obtained
by
focal
variation
microscopy
analyzed
MountainsMap
software
measure
parameters.
From
bacteria
associated
we
selected
Porphyromonas
gingivalis
evaluate
its
on
Ti6Al4V
surfaces
in
vitro
study.
Correlations
between
various
P.
investigated.
We
discovered
that
Sa
value,
common
roughness,
was
not
sufficient
describing
complexity
these
fs-L
treated
their
interaction.
found
Sku,
density
mean
depths
furrows,
most
accurate
for
purpose.
These
results
provide
important
information
could
help
anticipate
adhesive
properties
based
topographic
parameters,
development
promising
designed
biofunctional
implants.
Advances in Science and Technology – Research Journal,
Год журнала:
2023,
Номер
17(6), С. 27 - 38
Опубликована: Ноя. 20, 2023
Surface
modification
of
the
titanium
and
its
alloys
used
in
implantology
with
a
long-pulse
laser
can
change
surface
topography,
but
it
also
leads
to
changes
stress
sign
magnitude
resulting
subsurface
layer.The
presented
research
was
aimed
at
evaluating
state
after
remelting
Nd:YAG
preetched
Ti6Al4V
Ti13Nb13Zr
pure
titanium.The
obtained
layers
were
characterized
using
scanning
electron
microscopy
(SEM),
X-ray
diffraction
(XRD),
optical
profilography,
nanoindentation
studies.Based
on
results
tests,
character
stresses
generated
melted
calculated
determined.Laser
processing
resulted
layer
thicknesses
between
191-320
µm
roughness
Ra
2.89-5.40µm.Laser
caused
increasing
hardness,
highest
value
observed
for
alloy
-5.18
GPa.The
tensile
stressesappeared
following
treatment
andincreased
elevating
power
up
titanium.
Materials,
Год журнала:
2023,
Номер
16(13), С. 4834 - 4834
Опубликована: Июль 5, 2023
Laser
treatment
has
often
been
applied
to
rebuild
the
surface
layer
of
titanium
and
its
alloys
destined
for
long-term
implants.
Such
always
associated
with
forming
melted
re-solidified
thin
layers.
The
process
parameters
such
laser
can
be
different,
including
patterning
a
by
so-called
direct
writing.
In
this
research,
pulse
was
performed
on
Ti13Nb13Zr
alloy
surface,
distance
between
adjacent
paths
ranging
20
50
µm.
obtained
periodic
structures
were
tested
examine
effects
scan
microstructure
using
SEM,
roughness
chemical
phase
composition
EDS
XRD,
mechanical
properties
nanoindentation
technique.
After
writing,
thickness
layers
547
123
µm,
varied
1.74
0.69
An
increase
in
hardness
observed
after
treatment.
highest
hardness,
5.44
GPa,
sample
modified
beam
spacing
value
shown
important
several
related
complex
close
far
from
path.
Titanium
alloys
are
widely
used
as
biomedical
material
in
the
field
of
implants
because
outstanding
mechanical
properties
and
biocompatibility.
The
surface
important
factors
that
affect
cell
activities
on
surface.
In
order
to
investigate
effect
nanostructures
wettability
biocompatibility,
this
paper,
laser-induced
periodic
structures
(LIPSS)
were
produced
with
femtosecond
laser
at
1030
nm
343
wavelengths
titanium
alloy.
morphology
was
observed
by
scanning
electron
microscopy
(SEM)
parameters
such
depth
roughness
obtained
atomic
force
(AFM).
investigated
static
contact
angle
measurement.
results
revealed
LIPSS
caused
varying
degrees
reduction
linked
period
ripples.
MC3T3-E1
pre-osteoblasts
cultured
surfaces
study
Different
have
differences
determine
orientation
elongation
stretching.
alkaline
phosphatase
concentration
cells
suggested
osteogenic
difference.
Advanced Materials Interfaces,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 17, 2024
Abstract
Bacterial
biofilm‐associated
infections
are
a
persistent
and
growing
problem,
further
exacerbated
by
the
rapid
development
of
antibiotic‐resistant
bacterial
strains.
Antibacterial
surfaces
hold
great
potential
for
controlling
survival,
growth,
transmission
pathogens.
This
study
demonstrates
synergetic
integration
laser‐assisted
topographical
surface
modification
with
coating
solutions
to
simultaneously
engage
both
chemical
nano‐/micro‐topography‐sensitive
attachment
mechanisms.
The
developed
mechano‐chemo
bactericidal
combines
laser‐induced
periodic
structures
(LIPSS)
on
titanium
(Ti)
polydopamine‐chitosan‐silver
nanoparticles
(PCA)
composite
coating.
antibacterial
performance
this
hybrid
against
Gram‐negative
Escherichia
coli
(
E.
)
Gram‐positive
Staphylococcus
aureus
S.
exceeds
benchmark
achieved
either
approach
alone.
superior
resistance
biofilm
formation,
offering
viable
route
large‐scale
production
antimicrobial
enhanced
functionality
long‐term
performance.
