... hardness of aluminium composites decreases. Also, it is noted
that the hardness of aluminium matrix composites reinforced with silica sand is
higher than those reinforced with commercial silica. ... the higher sintered density accomplished in
aluminium matrix composite reinforced with silica sand.
Fabrication of Low Cost of Aluminium Matrix Com...
... strength of the E/GF composites with the addition of silane-
treated OMMT. According to Lin et al.,
5
the clays were dispersed between both
the bundles of GF and within the interstices of the ... effects of silane-treated OMMT loading on the flexural modulus of
E/GF composites are presented in Figure 2. The incorporation of silane-treated
OMMT increases the stiffness of...
... measurements
of the shell butyl acrylate shell, the range of concentrations of butyl acrylate was
9.9%–12.6%, that of SLS was 0.1–0.4 CMC, and that of APS was 0.01%–0.04%.
2.3 Determination of Solid ... polymerisation rate of the styrene core, and k is the rate reaction
constant in the formation of the styrene core.
3.4 Mechanism of Reaction in the Formation of the...
... of more water promotes higher mobility of the whole system and
made the recrystallization process appeared at lower temperature. The enthalpy of
exotherm of 1:2 system was higher compared with ... and narrow
exotherms at lower peak temperatures (85
o
C–100
o
C) which became smaller with lower
cooling rate. These observations suggest the presence of two types of amylose-lip...
... case of increasing precursor concentration, it was found that the
formation of Co nanoparticles was very slow at low concentrations of Co
chloride (< 30 mM) even with a large amount of N
2
H
4
... formation of Ni-Ag core-shell
nanoparticles by first generating Ni nanoparticles through the reduction of Ni
2+
with N
2
H
4
and followed by coating of the as-prepared N...
... flask.
2.3 Determination of Degree of Hydrolysis (Conversion) and Rate of
Hydrolysis
The degree of hydrolysis was determined by titration of the oil phase
samples with 0.1 M sodium hydroxide ... The degree of
hydrolysis, X is calculated as below:
(ml NaOH used) (molarity of NaOH) (average molecular weight of fatty acid)
,% =
10 (weight of sample)
X
(1)
T...
... important factors that determine the importance of
dehulling due to its low content of oil. So, the importance of dehulling should
decrease with the decreases of the hull percentage. Oil content (35.5%) ... growth of the importance of oilseeds in the national economy
of Sudan, the high demand to look for a new source of oil and the sufficient
availability of this plan...
... pressed with a cylindrical mould with a diameter of 16 mm under a
pressure of 150 MPa to yield samples in pellet form. The specimens were
sintered at various temperatures in the range of 1200
o
C ... GHz as a function
of sintering temperature with different compositions. The sample with
composition MBNT4 showed the highest dielectric constant in the range of 75 to
85 wi...
... fractions of 1-alkanol, as well as with temperature.
However, the value of viscosity increased with increasing concentrations of 1-
alkanols and decreased with increasing temperature. As the number of ... subsequent
formation of (new) H-bonds [C=O … H–O] between the proton acceptor
oxygen atom (with lone pair of electrons) of the C=O group of DMF and the
proton of...
... program
with a lattice of Bi
3
NbO
7
reported by Ling and Johnson as starting values.
11
All
of the peaks in the XRD patterns of these materials can be fully indexed in a
tetragonal system with ... for all of the samples of Bi
x
NbO
δ
(2.5 ≤ x ≤ 6).
The Arrhenius plot of YSZ is included for comparison purposes.
15
In general, at
300
o
C, the conductivity decreased in or...