Abstract. In this paper , we present the results of the synthesis of palladium nanoparticles (NPs)
in different solvents with different reduction methods, in order to study the solvent both as a
stabilizer and as a dispersant in the colloid, without any inert atmospheres, additional protective
molecules or special treatments, to transform the nanoparticles into zero-valent NPs. In this
particular case, dimethylsulfoxide (DMSO), dimethylformamide (DMF), ethylene glycol (EG), ethanol (EtOH), and water (H2O) are the solvents employed, all under aerobic conditions. The reduction methods include the solvent itself, photoreduction, chemical reduction with either sodium
borohydride or sodium citrate, and (sonochemical) ultrasonic irradiation
] B A ] C ] A ] ? ]
dous attention in the inorganic nanomaterials synthesis owing to their unique physico-chemical
properties, such as nonvolatile, negligible vapor pressure, low toxicity , and high thermal stability .
Most recently , many technological advances have occurred in the use of ILs, served as solvents,
reactants, or templates, in the synthesis of nanomaterials with controllable structures, morphologies and properties. In this paper, we provide an in-depth discussion of recent developments, in which ILs have been employed for the preparation of inorganic nanomaterials based
on their reasonable properties.
A new mechanism of misfit dislocation nucleation in surface nanowires and nanoislands
(quantum dots) growing on substrates is suggested and theoretically described. The mechanism represents the nucleation of a non-crystallographic partial dislocation whose Burgers
vector magnitude continuously grows during the nucleation process. The nucleation occurs by a
nanoscale ideal shear that involves collective displacements of atoms of a surface nanowire/
nanoisland. It is shown that the new mechanism of dislocation formation in surface nanowires/
nanoislands effectively competes with the standard nucleation of a perfect dislocation at a free
surface and its further glide towards the nanowire/nanoisland base center .
Synthesized hydroxyapatite was reinforced with functionalized carbon nanotubes, and
tensile strength, rupture tension, as well as fracture toughness values were calculated from the
indirect method of diametric compression test using the Brazilian disc specimen. Five formulations were evaluated covering the range of 0 to 2 wt.% of nanotubes. Results showed that the
addition of carbon nanotubes increases the mechanical properties of the ceramic composite
until an optimum value, followed by a decrease. Composites evaluated showed an increase of
approximately 58% on their fracture toughness property when 0.1wt.% of nanotubes were mixed
to hydroxyapatite. Scanning Electron Microscopy analysis shows that percentages higher than 1
wt.% of reinforce material may cause agglomeration and precipitation of a second phase governed by the reinforcement. This phenomenon instigates a reduction on the mechanical properties of the composite since these agglomerates act as a stress concentrator leading the composite to an early failure.
The lithium ion battery industry is increasingly looking for materials with a higher
capacity for lithium storage than the currently used graphite anodes, for use in the next generation of more powerful rechargeable batteries. Tin is one of the best solutions available thanks to
its high theoretical capacity and other technical benefits. However , tin anodes, similar to other
metallic materials, suffer from high volume changes during battery cycling, leading to premature
degradation of the anode. In order to overcome this problem different architectures of Sn-based
composites and intermetallics have been evaluated and some of them have shown promising
results. Progress towards the development of Sn-based anodes for next generation Li-ion batteries is summarized in this paper. The possibility of their usage in the battery market is also
briefly discussed.
In this work we studied the phase formation in the Al
2
O
3
/TiO
2
system using amorphous
powders with a high degree of chemical homogeneity and prepared by co-precipitation of inorganic salts. The aluminum tialite (Al
2
TiO
5
) phase of the Al
2
O
3
/TiO
2
system is of considerable
technological interest due mainly to its thermal properties. This phase is thermodynamically
C ?
] B B C ?
? C 4 ? ] ? C C
? C B
? 4 C B
4 ? B
4 ? B ?
?
] B B C ?
C ] ? C C
using chemical methods of powder synthesis like co-precipitation. In this work, the gel obtained
by co-precipitation of inorganic salts was calcined at different temperatures and dwell times. The
formation of metastable tialite under a number of temperature conditions and dwell times below
its stable formation temperature was observed. Results showed strong dependence not only on
calcination temperature, but also on dwell time. The cooling rate did not significantly alter the
conversion or reverse conversion of tialite into rutile and corundum.
This research constructs a relationship between the geometrical cross section and
the fatigue strength of aluminum alloy (6063). Different geometrical cross - section specimens
were manufactured with the same section space, then the specimens were tested under bending and unbending loading conditions. The strain was calculated and fatigue curves were drawn
for all the different forms of sections. After studying and analyzing the results, it became clear that
increasing the sides in any form increases the fatigue strength as the strain is fixed. Fatigue
curve equations were derived using computing techniques and connected to find a mathematical relationship between the geometrical shape of the section and fatigue strength. Equation
were derived in order to determine the stress or strain, a specimen of a certain section figure can
endure to fail under the effect of a number of cycles. The results were tested by taking specimens
with different shapes of sections and loading them with different loads. The results show a good
agreement when applying the same conditions for all specimens.
New developments and emergence of nanotechnologies have stimulated efforts to
develop high performance coatings. In the present study , the influence of laser surface modification on the corrosion characteristics of an electrodeposited nanostructured Ni-Co thin coating is
examined. Electrodeposited coatings were peeled-off from the substrate surface and subjected
to laser surface irradiation using three different laser power levels; 90 W, 110 W, and 140 W. It was
observed that the irradiated sample at 140 W was bent towards the irradiation direction. The
surface of this sample experienced cracking upon observation using SEM and following electrochemical test. The effect of laser irradiation on the overall corrosion performance of the electrodeposited Ni-Co coatings was assessed. It was found that laser irradiation had no noticeable
effect on the corrosion potential. Nevertheless, there was a systematic shift of the pitting potential
towards more active values as the laser power intensity increased despite of the formation of a
semi-passive film accompanied by lower current densities
Karya Umum 
Filsafat 
Agama 
Ilmu-ilmu Sosial 
Bahasa 
Ilmu-ilmu Murni 
Ilmu-ilmu Terapan 
Kesenian, Hiburan, dan Olahraga 
Kesusastraan 
Geografi dan Sejarah