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Файл:Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_5471_Библиотеки_им_академика_М_И_Перельмана
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14
Metals in Medicine, Volume 1
35
-
-
36
carbon, polystyrene, and calcium carbonate (CaCO
3
-
nitrides, boron nitride, and carbon nitride.
35
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Recent Advancements in Nanoporous Metal Foams for Biomedical Applications
15
porous carbon compounds, are used in hard templating techniques. Carbon
aspect-ratio pores as small as 400 nm in diameter and as deep as 10 lm.
36
and sponges). Metal meshes are seen to be the most promising substrates
37
2
M2 Me
+−
+=
(1.8)
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16
Metals in Medicine, Volume 1
2
22H eH
+−
+=
(1.9)
On the cathode, the metal reduction reaction and the hydrogen
evolution reaction (HER) both happen simultaneously. Since M
2+
has
a larger negative potential than H
+
metal.
37
Since the in-site produced hydrogen bubbles act as a template, the pore
3D porous structures. Since the substrate and the deposited layer both repre-
sent the same element, their matching lattices and similar lattice constants
38
metal being deposited, the current density and overpotential employed,
production.
39
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17
Metal (Cu) dendritic electrodeposition is required to produce a highly
-
-
39
:
( )
c
j c zF D c
t
µ
∂±
= −∇ ± = ∇ ± ± ± ∇∅ + ± ∇ ±
∂
(1.10)
j, c, m, z, D
d). Equa-
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18
Metals in Medicine, Volume 1
0.5 2 0.45
0.02 ( / ( )) (1 0.2 / ( ))
lg
d g i Am
θγ ρ ρ
−
= −+
(1.11)
g γ
tension, i is current density, ρ
l
is the liquid density ρ
g
is the gas density, γ is
39
during electrodeposition is given in eq 1.12.
2
1e
k
k
wk
η
−
=
(1.12)
k
is the overpotential and k
1
and k
2
are constants.
radius (r
c
3
6
c
cc
hE
r
Z
π
η
=
(1.13)
Z
e
E denotes the
h denotes the height created by absorbent atoms.
25
Impact of current density
2
-
creates smaller H
2
bubbles, resulting in a structure resembling a honeycomb
39,40
Impact of the deposition time-
-
structure to vanish.
39,41
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Recent Advancements in Nanoporous Metal Foams for Biomedical Applications
19
Temperature’s impact: More hydrogen evolution happens as the deposi-
tion temperature rises, creating a bigger bubble template. As a result, the
39
Additions
so raise the cathodic overpotential, NH
4
+
4
4
)
2
SO
4
39,41
values, high (
j0, dep
>100 A cm
-
0, dep
100
A cm
) exchange current densities, and modest hydrogen evolution catalytic
depositing process.
42
0, dep
values
ɳ surpasses a necessary starting overpotential.
lim.dep
0,dep
ini = -
j
RT
ZF j
η
(1.14)
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20
Metals in Medicine, Volume 1
j
lim, dep
j
lim, dep
is highly dependent on
electrode solution brought on by HER.
2
bubbles created during the electrolysis can reach
-
d
evolution j
HER
( )
b
0 HER
1d d aj= + (1.15)
2
A
d
0
in eq (1.15), and its value may be calculated using a streamlined version
0
1.2d
g
γ
ϑ
ρ
=
(1.16)
g
γ
42
intermediaries or expensive processing techniques such as vacuum proce-
optics, electronics, semi- and superconductors, and biomaterials, due to the
production, and precise chemical and microstructural control. In addition to
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Recent Advancements in Nanoporous Metal Foams for Biomedical Applications
21
suitable biomolecules.
43
-
44–46
-
tion, and nanocarriers to transport biomolecules, among other applications.
-
n
the metallic element and R may represent a proton or other ligands such as an
alkyl or alkoxy group. Once the hydrolysis process has begun, molecules that
have only partially undergone hydrolysis interact in a condensation reaction
the sol–gel procedure.
47
( )
2
()M OR n xH M OR n x xROH+ → −+
(1.17)
( ) ( ) ( ) ( )
2
()OR n xM OH x M OR n x OR n xM O M OR n x H O−− − −→ −−− −+
(1.18)
48
nano-
smelting to produce metal aerogels,
49
51
methanol to convert the metal acetate to a metal.
-
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22
Metals in Medicine, Volume 1
52
2
, Al
2
O
3
, Fe
2
O
3
, and Mn
2
O
3
,
and related nanomaterials.
53
+
, He
+
, O
+
, Ar
+
, or Xe
+
-
contamination can be eliminated, nevertheless, by using thermal annealing
or inert gas-based ion beams.
51
According to Lin et al.,
54
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Recent Advancements in Nanoporous Metal Foams for Biomedical Applications
23
altered by adjusting the electrochemical dealloying time. It has also been
2
-
1
6
Al
4
E
P
E
f
=
(1.19)
P
55
2
g
, depending on temperature and
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