Materials Literature
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We present a theoretical and experimental (2)H NMR study of the effect of external magnetic fields on the supramolecular organization of chiral smectic liquid-crystalline mesophases, such as SmC* and re-entrant SmC*. Three experimental cases in which the supramolecular helical structure of the smectic C* phase is unwo…
The relationship between glass-transition temperature T g , plateau modulus G N 0 , microstructure of different polymers (high cis-1,4-BR, NR, butyl rubber and various styrene-butadiene copolymers) and the wet skid resistance (WSR) of the corresponding filled treat compounds were investigated. Additionally, the relati…
A perchlorate ligand in the rare mu4-1,1,2,2 binding mode is seen for the first time as the sole support for the assembly of two cationic [Cu II 2L]+ fragments (H3L = a dinucleating ligand) in the formation of a magnetically-exchanged tetranuclear cluster.
Well-defined diblock copolymers of D,L-lactide and pentafluorostyrene with narrow molecular weight distributions (polydispersity index <1.25) were successfully synthesized via sequential ring-opening and atom transfer radical polymerizations. Poly(D,L-lactide) is the minority component; microphase separation results i…
Y2.9–x Ce0.1Bi x Fe5O12 (x = 0–0.5) nanoparticles ranging from 58 to 63 nm were fabricated by a sol–gel method, and their crystallite structures and magnetic properties were investigated by X-ray diffraction (XRD), IR spectroscopy, and vibrating sample magnetometer (VSM). Results of VSM show that the saturation magnet…
Abstract We review recent experimental and theoretical studies on the radiative properties of excitons in single‐walled carbon nanotubes (SWNTs) as a function of magnetic field and temperature. These studies not only provide new insight into the fundamental properties of excitons in the ultimate one‐dimensional (1D) l…
Abstract Rod‐type polypyrrole (PPY) doped with p ‐toluenesulfonic acid (TSA) was synthesized by chemical oxidative polymerization via a self‐assembly process. The shape of the PPY particles is mainly determined by the ratio of TSA/pyrrole (PY) and feed rate of the oxidant. Particle of different shapes (rod, grain, and…
Solar ablation creates the sharp radiative and temperature gradients, as well as the high-temperature annealing environment, that favor nanomaterial syntheses. Using highly concentrated sunlight, we generated fullerene-like MoS2, ranging from single-walled nanotubes and closed-cage structures to their larger multi-wal…
The mechanical properties of many materials have been enhanced via cryogenic treatment, which is a cold temperature process performed after traditional heat treatment. In this research the effect of cryogenic treatment on GRCop-84 was examined. Cryogenically and non-cryogenically treated samples were tested identicall…
Processing conditions for the specific δ-form syndiotactic polystyrene (s-PS) films, being suitable to detect amplify and memorize the chirality of several volatile non-racemic organic guests, have been investigated. The occurrence of induced circular dichroism (ICD) phenomena is critically dependent not only on the p…
We report on a method which allows direct patterning of density controlled carbon nanotube network (NTN) devices during network formation. By lithographically patterning photoresist on the filter membrane, the nanotubes in suspension were guided to the exposed pattern areas of the filter surface during vacuum filtrati…
Magnetite (Fe3O4) is a mixed valent system where electronic conductivity occurs on the B site (octahedral) iron sublattice of the spinel structure. Below T(V)=123 K, a metal-insulator transition occurs which is argued to arise from the charge ordering of 2+ and 3+ iron valences on the B sites (Verwey transition). Inel…
A functionalized verdazyl radical, 1, was synthesized, which consists of a bodipy acceptor (A), a phenyl-anthracene donor (D), and a stable verdazyl radical (R). Optical measurements, electron spin resonance (ESR), time-resolved ESR (TRESR), and laser-excitation pulsed ESR experiments were carried out. The efficient i…
We tailor anodized alumina with pores with well-defined, simple geometries, in order to study the effects of constrictions in hysteretical capillary condensation, independently from other cooperative processes such as network effects. We confirm, by direct observation using optical interferometry, the occurrence of tw…
We consider the orbit of the bullet cluster 1E 0657−56 in both cold dark matter (CDM) and Modified Newtonian Dynamics (MOND) using accurate mass models appropriate to each case in order to ascertain the maximum plausible collision velocity. Impact velocities consistent with the shock velocity (∼ 4700 km s−1) occur nat…
Nucleation of crystallizable polymers is quantified through an efficiency scale. The parameter E=100 ((Tc−Tc 0)/(Tc max−Tc 0)) where Tc 0 and Tc max are the crystallization temperatures of a non-seeded and of an “ideallly” seeded sample, respectively, gives a measure of the efficiency fo a given nucleating agent which…
The donor/acceptor heterojunction devices having configuration n-PANI/p-PSi were fabricated by in-situ chemical oxidative polymerization method of aniline on p-type porous silicon. The structure of n-PANI/p-PSi junctions was examined by scanning electron microscopy and X-ray diffraction spectroscopy. The dark current-…
We have developed the Brownian Dynamics simulation technique to calculate the viscoleastic behaviour of model colloidal dispersions. The linear or Newtonian behaviour of the liquid has been obtained using the Green-Kubo formula which incorporates the stress relaxation time autocorrelation function calculated from an u…
Abstract The present features review article discusses the crystallisation of the polymer matrix when containing silicate layers. The accent is put on nylons (polyamides) and poly(ethylene oxide) as typical hydrophilic polymers and, poly(propylene) from the hydrophobic group. The effects of the clay, either intercalat…
A polymer switch was explored utilizing the redox reaction of iodide ions with highly fluorescent s-triazine (ST)-bridged p-phenylene vinylene (PPV) polymers. The fluorescent polymers were synthesized through the Wittig polycondensation to yield ST-bridged PPV polymers. Utilizing different quenching properties of the…