Chemistry Reference
In-Depth Information
above cases, are adduced. As one can see, in both cases, for the range of
T
=
293 ÷ 363 K
l
st
, where interactions nanoclusters − loosely packed matrix are
characterized by powerful friction between them, the value
b
m
does not de-
pend on
N
u
, as it was expected. For the range of
T
= 373 ÷ 413 K, where be-
tween nanoclusters and loosely packed matrix perfect adhesion is observed,
the linear dependences
b
m
(
N
u
) are obtained. However, at using value
D
cl
as
Lb
m
reduction or intercomponent adhesion level enhancement at
N
u
decreas-
ing is obtained and at
N
u
= 0
b
m
value reaches its minimum magnitude
b
m
= 0.
In other words, in this case the minimum level of intercomponent adhesion
is reached at intercomponent bonds formation sites (nodes) absence that is
physically incorrect [48]. And on the contrary at the condition
L
=
l
st
b
m
the
reduction (intercomponent adhesion level enhancement) at the increase of
contacts number
N
u
between nanoclusters and loosely packed matrix is ob-
served, that is obvious from the physical point of view. Thus, the data of Fig.
15.21 indicate unequivocally, that the intercomponent adhesion is realized
over side (cylindrical) nanoclusters surface and butt-end surfaces in this ef-
fect formation do not participate.
FIGURE 15.21
The dependences of parameter
b
m
on a number of accessible for
intercomponent bonds formation sizes on nanocluster surface
N
u
at the condition
L
=
D
cl
(1)
and
L
=
l
st
(2) for PC [55].
Let us consider geometrical aspects intercomponent interactions in natu-
ral nanocomposites. In
Fig. 15.22
the dependence of nanoclusters butt-end
S
b
and side (cylindrical)
S
c
surfaces areas on testing temperature
T
for PC are
