Materials Literature
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We find that dipolar interactions favor ferromagnetic ordering of elongated crystals of ${\text{Mn}}_{12}$ acetate below 0.8 K. Ordered crystals must possess domain walls. Motion of the wall corresponds to a moving front of Landau-Zener transitions between quantum spin levels. Structure and mobility of the wall are co…
Cyclic poly(oxyethylene) (POE) was prepared from hydroxyl-terminated linear POE with molecular weights from 400 to 1500 g/mol using a dilute-solution end-coupling route. These cyclic and linear POEs were solution-mixed with linear polystyrene (PS, 15 kg/mol) to prepare binary blends with POE concentrations from 1.5 to…
A hybrid system comprising bimetallic nanoparticles supported on carbon nanotubes (CNTs) was engineered to maximize the surface-enhanced Raman scattering signal from solution by generating a high density of hot spots with reproducible enhancing activity and long-term colloidal and optical stability. CNT@AgAu was emplo…
This paper reports the effect of chemical treatment on the mechanical properties of a natural fiber, isora, as reinforcement in unsaturated polyester resin. Isora fiber is separated from the bark of the Helicteres isora plant by a retting process. The short isora fiber surface was modified chemically by acetylation, b…
Abstract Core‐shell type hyperbranched polymers that are capable of forming unimolecular micelles and reverse micelles in aqueous and hydrocarbon medium, respectively, were synthesized via two approaches, namely AB 2 + A‐R and A 2 + B 3 + A‐R type copolymerizations. In case of micelle‐forming polymers, an AB 2 monomer…
We developed an electrode/wiring patterning method that does not employ evaporation shadow masks; this method is based on selective metal deposition of photochromic diarylethene (DAE). In the selective Mg deposition based on the photoisomerization of DAE, Mg vapor atoms are deposited only on colored DAE film obtained…
The cooling performance and thermal comfort of a thermoelectric ceiling cooling panel (TE-CCP) was investigated for this paper. The TE-CCP was composed of 36 TE modules. The cold side of the TE modules was fixed to an aluminum-ceiling panel to cool a test chamber of 4.5m 3 volume, while a copper heat exchanger with ci…
We describe mono-substituted helical poly(phenyl)acetylene, a structural variation of polyacetylene that may overcome its problem: the lack of chemical stability. Helical polyacetylene shows an intrinsic stiff rod structure, which can be enhanced by the choice of suitable side groups. The structure looks like a narrow…
Abstract— The molecular design of a liquid crystal to stabilize a blue phase III (BPIII) is reviewed, and the electro‐optical switching with a response time on the order of 10 −2 sec for BPIII exhibited by a novel chiral liquid crystal is reported. Binaphthyl derivatives and T‐shaped compounds are presented, and the s…
Results are presented on the electronic, electric, and magnetic properties of yttrium iron garnet, Y 3 Fe 5 O 12 using first-principles calculations. A cubic centrosymmetric structure and a tetragonally strained structure of Y 3 Fe 5 O 12 are investigated. Frozen-phonon calculations are performed for both phases. We s…
The response of two carbide derived carbons (CDCs) films to NH(3), N(2)O, and room air is investigated by four probe resistance at room temperature and pressures up to 760 Torr. The two CDC films were synthesized at 600 (CDC-600) and 1000 degrees C (CDC-1000) to vary the carbon morphology from completely amorphous to…
We experimentally and theoretically report a giant magnetoelectric (ME) effect in a heterostructure made by clamping a bar-shaped magnetostrictive Tb0.3Dy0.7Fe1.92 (Terfenol-D) alloy actuator and a cymbal-type piezoelectric 0.7Pb(Mg1/3Nb2/3)O3–0.3PbTiO3(PMN–PT) (PMN-PT) single crystal-brass alloy transducer in a brass…
We measure several electromagnetic properties of tungsten-Teflon composites as a function of metal volume concentration. The electric (E) and magnetic (H) loss tangents at 2.45GHz and the dc conductivity each exhibits a percolation transition at a different critical value of the metal volume fraction p. Moreover, the…
In this paper we present an investigation into the calculation of the Frank elastic constants of hard platelets via molecular simulation and virial expansion beyond second order. Monte Carlo simulations were carried out and director fluctuations measured as a function of wave vector k, giving the elastic constants thr…
A new method for immobilizing horseradish peroxidase (HRP) in the enzymatic synthesis of poly(3,4-ethylenedioxythiophene) (PEDOT) is reported. This method is based on 3,4-ethylenedioxythiophene monomer droplets created due to its poor solubility in water and in the stabilization effect that these monomer droplets show…
Abstract Conducting polyaniline‐polymannuronate (PANI‐PM) composites were synthesized via in situ deposition techniques. By dissolving different weight percentages of polymannuronate (PM) (5, 10, 15, and 25%), the oxidative polymerization of aniline was achieved through the use of ammonium persulfate as oxidant. Struc…
Abstract The development of nanostructured microcapsules based on a biomimetic lipid bilayer membrane (BLM) coating of poly(sodium styrenesulfonate) (PSS)/poly(allylamine hydrochloride) (PAH) polyelectrolyte hollow microcapsules is reported. A novel engineered ion channel, gramicidin (bis‐gA), incorporated into the li…
Measurements as a function of both magnetic field and temperature along with first principles spin polarized calculations explain the remarkable magnetoelastic properties exhibited by GdNi below its Curie temperature. The lattice constants $a$ and $b$ elongate continuously by 0.35% and 0.49%, respectively, while the $…
By using FeCl 3 ·6H 2 O as an oxidant, a novel organic/inorganic complex nanostructure, poly(3,4-ethylenedioxythiophene)/β-akaganeite (PEDOT/β-Fe 3+ O(OH,Cl)) nanospindle, was successfully synthesized in aqueous solution in the presence of cetyltrimethylammonium bromide (CTAB) and poly(acrylic acid) (PAA). The lengths…
A facile route was developed to create surface porous polystyrene/poly(vinylpyrrolidone) (PS/PVP) films, via phase separation in a dip-coating process, for antireflection applications. The film thickness, pore size, and pore depth of the product films can be effectively adjusted with the concentration of the PS/PVP (v…