Materials Literature
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New troponoid liquid crystals with a tropone terminal group were prepared. Tropon-4-yl 4-n-alkoxybenzoates (1T) had a monotropic smectic A phase. However the corresponding benzenoid derivatives (1B), tropolon-5-yl 4-n-alkoxybenzoates (2T), 2-methoxytropon-5-yl 4-n-alkoxybenzoates (3T), and tropon-2-yl 4-n-alkoxybenzoa…
The use of polymer microspheres for producing fine-cellular foams is a new development in rotational molding. In previous studies, some reduction in mechanical properties has been found due to the immiscibility between the polymer shell and the matrix polymer. Coupling agents can act as a molecular bridge at this inte…
A centrally loaded round panel test was used to characterize the fracture energy of FRC under low velocity impact loading. The specimens, with a diameter of 650 mm and a thickness of 60 mm, were cast using plain high strength concrete (HSC, f’c = ~80 MPa), steel fiber reinforced HSC and a synthetic fiber reinforced HS…
Driving down processing costs on military and commercial aerospace components is an unending quest for the process metallurgist. Concurrently, the integrity of the powder metal (PM) component must be maintained or improved in these high strength, high temperature, fatigue limited components. A unique processing route,…
Different low thermal expansion ceramics of Ca1-xSrxZr4(PO4)6 system with x = 0, 0.25, 0.5 and 0.75 were synthesized by the solid state reaction method. After several heat treatments finished products were obtained at 1300°C. These were characterized for phase purity by X-ray Diffractometry and IR Spectroscopy. Densif…
Sol-gel technique has been utilized to deposit heterostructured Ba0.5Sr0.5TiO3:MgO (BST:MgO) films with different BST/MgO layer sequences and thicknesses in order to achieve enhanced microwave properties. The correlation between the structure, microstructure, and the dielectric properties are presented. Eight element…
The three-dimensional X-ray diffraction (3DXRD) method is reviewed. The method is based on the use of high-energy X-rays from synchrotron sources and a ‘tomographic’ approach to diffraction. With 3DXRD the structure of the embedded grains within polycrystals or powders can be characterised non-destructively within mil…
The synthesis of a series of novel multipodes based on disc-shaped mesogens with a siloxane core is described. Their phase behaviour is characterised and compared to the liquid crystalline properties of the discotic molecules without the siloxane moieties. We observed that incorporation of the siloxane group results i…
π‐conjugated molecules are unique models for studying confinement effects on a system of interacting 2pz carbon electrons. When introducing edges in an extended periodic system, changes of the electronic structure in the vicinity of the edges are found. Scanning tunneling microscopy and Raman spectroscopy can be effec…
In order to meet future emission targets, heavy-duty (HD) diesel enginemanufacturers are currently focussed primarily on aftertreatment technology.Altering fuel composition is an alternative route towards achieving loweremission levels. The potential of oxygenated fuels to significantly reduceparticulate matter emissi…
High strength linepipe is being adopted for transporting oil and natural gas in order to improve transportation efficiency through pressure operation and to reduce pipe laying costs. In such strength linepipe, excellent low-temperature toughness in the base material, weld metal and heat affected zone (HAZ) as well as…
The aim of this research work is to establish an accurate measurement technique using pulsed electro-acoustic method for observing a dynamic space charge behavior in insulating materials during elevating temperature under high electric stress. When the high electric stress is applied to the dielectric materials, so-ca…
A new beamline, Cassiopeia, at MAX II is about to come into operation. It consists of an energy‐tunable station and four side stations intended for macromolecular crystallography. The X‐ray source is a 3.5 T superconducting multipole wiggler installed in the 1.5 GeV MAX II storage ring. The energy‐tunable station use…
The new Structurally Integrated BiologY for Life Sciences (SIBYLS) beamline at the Advanced Light Source will be dedicated to Macromolecular Crystallography (PX) and Small Angle X‐ray Scattering (SAXS). SAXS will provide structural information of macromolecules in solutions and will complement high resolution PX studi…
CoSb3 micrometer powder was synthesized by solidstate reaction using high pu rity powder of Co,Sb as the starting materials.CoSb3 nano-powder was prepared by highenergy ballmilling.CoSb3 block material with the average grain size of 150nm was prepared by Spard Plasma Sintering(SPS).The influence of nanostru cture o…
The properties of organic/inorganic nanocomposites are determined by the performance of an inorganic particle and organic matrix. Thus, it is important to clarify the mechanical properties of inorganic particles in nanocomposites. However, since the size of a particle is very small even at a nano order, it is difficul…
The product developments that have taken place since John Looms published, in 1988, his excellent book that covered much of this subject have mainly concerned polymeric materials especially silicone rubber. Although the principal modifications made to porcelain and glass insulators over this period are those required…
It has long been hypothesized and recently shown that hexavalent chromium ions in the chromate conversion coating (CCC) migrate to active sites. This repassivation behavior of chromate conversion coatings leads to protection from corrosion resulting from mechanical damage. The nature of this repassivation has been exp…
2024 aluminium alloy is commonly used for the fuselage of aircraft or helicopters because of its high strength. The fuselage bears the weight of the movers of the aircraft and the oil or petrol tanks. It works where the climatic conditions are very harsh, i.e. very low temperature and salt fog, and in presence of aggr…
A series of diphenylacetylene derivatives were synthesized to serve as ligands for metal alkyne complexes. The target compounds, alkyl 4′-(4-phenylethynylbenzoyloxy)-biphenyl-4-carboxylates, were prepared using a three-step synthetic procedure. Both the diphenylacetylene derivatives as well as their immediate precurso…