Materials Literature
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The perovskite Bismuth ferrite BiFeO3 (BFO) is considered to be a model multiferroic and offers a rare multiferroelectric robustness since it presents a coexistence of ferroelectric and antiferromagnetic order up to unusually high temperatures. Perovskite-type materials are known for their common structural instabilit…
Bone marrow mesenchymal stem cells (MSCs) have demonstrated their pluripotency to differentiate into different cell lineages and may be an alternative cell source for vascular tissue engineering. The objective of this study is to create small diameter vessels by seeding and culture of genetically modified MSCs onto a…
New tiling patterns with complex arrangements have been identified for ABC star-shaped terpolymers and ABC/A/B copolymer/homopolymer blends characterized by transmission electron microscopy and microbeam small-angle X-ray scattering. The samples are composed of polyisoprene (I), polystyrene (S), and poly(2-vinylpyridi…
We report the first experimental measurements of the contact number distribution between randomly packed granular right cylinders (rods and disks) as a function of aspect ratio. The average coordination number ⟨ z ⟩ for cylinders varies smoothly with aspect ratio rising from ⟨ z ⟩ ∼ 6 for aspect ratios close to one to…
In this paper we have studied the relaxor behavior of BaZrxTi1−xO3 (0.50⩽x⩽0.80) ceramics. The relaxor behavior of BaZrxTi1−xO3 (BZT) solid solution is analyzed with respect to the increasing amount of Ti4+ rich polar regions in the nonpolar matrix of BaZrO3 which has a very low dielectric constant (∼27). The dielectr…
The structural hierarchy and stereochemistry have been considered for 24 titanium disilicate minerals that contain the TS (Titanium Silicate) block, a central trioctahedral (O) sheet, and two adjacent (H) sheets of [5]- and [6]-coordinated polyhedra and (Si2O7) groups. The TS block is characterized by a planar cell ba…
A range of selectively degradable core cross-linked star (CCS) polymers were synthesized via a combination of atom transfer radical polymerization (ATRP) and ring-opening polymerization (ROP) using the “arm first” method. The multifunctional initiator 2-hydroxyethyl 2‘-methyl-2‘-bromopropionate was used to synthesize…
Abstract Summary: The swelling and dissolution mechanisms of native cotton and wood cellulose fibres in NaOH–water are studied. The cellulose fibres exhibit a heterogeneous swelling by ballooning in the best dissolving conditions (−5 °C, 7.6% of NaOH). This corresponds to the mode 3 of the swelling‐dissolution (see co…
Conjugated, borole-linked polymers have been self-assembled based on boronate ester formation between a fluorene-2,7-diboronic acid and 1,2,4,5-tetrahydroxybenzene. Readily soluble polymers with molecular weights approaching 60 000 have been generated with materials exhibiting extended conjugation over approximately 3…
A synthesis approach for shape control of single crystalline Bi nanostructures has been developed. By controlling the molar ratio of PVP and Bi in a polyol process, Bi nanocubes with an edge length of approximately 60-80 nm, triangular nanoplates with an edge length of 200-500 nm, and nanospheres with an average diame…
A polycrystalline sample of BaTi0.85(Fe1∕2Nb1∕2)0.15O3 is synthesized by high temperature solid state reaction technique. This sample crystallizes in cubic pervoskite structure at room temperature. The dielectric properties have been investigated at temperature range from 80to450K at various frequencies (100–107Hz). F…
Despite advances in diagnostic imaging and drug discovery, primary malignant brain tumors remain fatal. Median survival for patients with the most severe forms is rarely past eight months. The severity of the disease and the lack of substantial improvement in patient survival demand that new approaches be explored in…
Azobenzene thin films undergo an unexplained spontaneous surface patterning when exposed to light intensity and/or polarization gradients. The elastic modulus of an azobenzene−polymer film is measured before and during laser irradiation using AFM indentation experiments. It is found that there is no significant change…
Three different synthetic methods were studied with respect to their usefulness for the preparation of poly(isosorbide carbonate) (PIC). Thermal polycondensations of isosorbide with dimethyl- or diethyl carbonate in bulk proved unsuccessful, regardless of the transesterification catalyst. Polycondensations of isosorbi…
Abstract Cryosols from Maritime Antarctica have been less studied than soils from continental areas of Antarctica. In this work X-ray diffraction, difference X-ray diffraction, differential thermal analysis, thermogravimetry, transmission electron microscopy/energy dispersive spectroscopy and selective chemical dissol…
We investigate the effect of surface energy and chain architecture on the orientation of microdomains in relatively thick films (600−800 nm) of lamellar and cylindrical block copolymers of poly(cyclohexylethylene) (C) and poly(ethylene) (E). The E block has 26 ethyl branches per 1000 backbone carbon atoms. Melt surfac…
Abstract Summary: A broad variety of regenerated cellulose fibres was subjected to single fibre tensile tests in order to determine the modulus of elasticity, tensile strength, and failure strain. The results were compared to glass fibres and flax fibres, which are considered the most important technical and natural f…
The bifunctional conjugated organoboranes Ar2B-bt-BAr2, which contain 2,2'-bithiophene (bt) linkers and different aryl substituents on boron (3: Ar = p-tBuC6H4; 4: Ar = C6F5; 5: Ar = C6F5, Fc; Fc = ferrocenyl), have been synthesized. The electronic communication between the boron centers and cooperativity effects in t…
The main results of studying the synthesis, growth mechanisms, and optical properties of gold nanorods published in the last 5–8 years are briefly reviewed. Hydrosols of gold nanorods with variable axial ratios are synthesized in the micellar solution of ionic surfactants by sead-mediated growth procedure using the st…
In this review, current activities in the development of active biomaterials related to bio‐interfacial design as well as novel concepts for smart polymer systems are highlighted. For instance, advanced biomedical coatings, including vapor‐based polymer coatings for the controlled attachment of biomolecules, and tempe…