Materials Literature
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A series of chromophore-functionalized polybinaphthalenes have been prepared and characterized for their (nonlinear optical) properties. The polymers were prepared by direct polymerization using a Stille coupling between a bis(trimethyltin) compound and dibromo-substituted binaphthalene monomers. The chromophores were…
We study numerically the wetting properties of model heterogeneous flat substrates. The shapes of three-dimensional liquid drops in equilibrium with such substrates in the framework of the classical capillary theory are obtained. The numerical method used for minimizing the free energy is based on the local variations…
In-situ optical microscopy was used to measure the growth rate of gibbsite single crystals growing from aqueous sodium aluminate solutions. The growth rate was measured for various crystal faces, i.e., {100} and {001} faces in case of twinned hexagons and {110} faces for single crystalline lozenges. A considerable dis…
In this work, we have applied surface-enhanced Raman scattering (SERS) and surface-enhanced infrared spectroscopy (SEIR) to study the interaction of nitro polycyclic aromatic hydrocarbons (NPAHs) with metal surfaces. The nitro group confers the polycyclic aromatic hydrocarbons (PAHs) moiety additional electronic and s…
Positive polyelectrolytes were investigated as new surface coatings for promoting in vitro actomyosin motility. Two surface arrangements were studied: a monolayer of the polyelectrolyte PAH, poly(allylamine hydrochloride), and multilayers consisting of 11−41 layers of alternating polypositive PAH/polynegative PSS (pol…
The compound [NH(3)(CH(2))(2)NH(2)(CH(2))(2)NH(3)](2)[Mo(9)O(30)] was synthesized at 170 degrees C via hydrothermal techniques from the starting materials of Na(2)MoO(4).H(2)O, NH(2)(CH(2))(2)NH(CH(3))(2)NH(2), and H(2)O. The compound crystallizes in the space group C2/c of the monoclinic system with a = 21.308(4) A,…
For the Cu x S system there exists several known solid phases such as Cu 2 S (chalcocite), Cu 1.8 S (digenite), Cu 1.96 S (djurleite), and CuS (covellite). All of these phases have been identified as p-type semiconducting materials due to copper vacancies within the lattice, which is responsible for their usefulness a…
At 1 atm pressure, high-quality multiwall carbon nanotubes were synthesized directly from graphite in the absence of catalyst by a one-step water-assisted method.
Yam starch films, formulated with yam starch (4.00 g/100 g of solution) and glycerol (1.30 and 2.00 g/100 g of solution) in filmogenic solution, were employed as packaging to extend storage life of strawberries stored at 4 degrees C and 85% RH. The effects of yam starch films on fruits were compared to the effect of P…
The magnetoresistance associated with quantum interference corrections in a high mobility, gated InGaAs/InP quantum well structure is studied as a function of temperature, gate voltage, and angle of the tilted magnetic field. Particular attention is paid to the experimental extraction of phase-breaking and spin-orbit…
Fucoxanthin-chlorophyll proteins were purified from the centric diatom Cyclotella meneghiniana. Two major fractions were observed that differed in their polypeptide composition and oligomeric state. Trimers consist of mainly 18 kDa polypeptides. Higher oligomers are tightly assembled from different trimers, which cont…
This paper describes a general method to drastically improve the dispersity of oleic acid stabilized nanoparticles in aqueous solutions. We use oleic acid stabilized monodisperse nanoparticles of iron oxides and silver as model systems, and have modified the surface properties of these nanoparticles through the format…
N-(Fluorenyl-9-Methoxycarbonyl) dipeptides form supramolecular hydrogels via hydrogen bonding and hydrophobic interactions. These hydrogels respond to a ligand-receptor interaction as well as to thermal or pH perturbation and also exhibit chiral recognition.
The model describing two coupled single-molecule magnets is considered by including anisotropic exchange interaction in the spin Hamiltonian. The tunnel splittings are calculated perturbationally for arbitrary spin in several selected cases and estimated numerically by using a ${\mathrm{Mn}}_{4}$-dbm as a model system…
We investigate the relevance of site-bond percolation theory to model the resorption and ossification of natural coral implanted in bones. The first step of the process is the vascularization of the implant seen here as a percolation threshold. The resorption and ossification can thus take place by activation of unocc…
Natural alexandrite (BeAl 2 O 4 :Cr 3+ ) crystals are investigated as regards the effects of annealing on their optical properties. Optical absorption spectra are measured from the ultraviolet (190 nm) to the near infrared (900 nm), for a sample subjected to consecutive annealing processes, where time and temperature…
The photoexcited triplet states of free-base porphyrin (H(2)P) and free-base tetraphenylporphyrin (H(2)TPP) have been investigated by time-resolved electron paramagnetic resonance and electron-nuclear double resonance in a toluene glass at 80 K. Both the zero-field splitting parameters, D and E, and the proton A(zz) h…
In our further investigation on the microfabrication of carbon nanotubes, we found that micropatterns of perpendicular ly a ligned carbon nanotubes can be prepared by simply pressing an adhesively sticky tape (e.g., Scotch tape) prepatterned with a nonadhesive layer onto a nonpatterned aligned carbon nanotube film, fo…
We report combined x-ray photon correlation spectroscopy (XPCS) and neutron spin echo (NSE) measurements of the layer-displacement fluctuations in smectic liquid-crystal membranes in the range from 10 ns to 10 micros. NSE reveals a new regime, determined by bulk elasticity, in which relaxation times decrease with the…
Fully reconfigurable hydrophobic–hydrophilic surfaces were achieved by reversibly adsorbing and removing avidin from a hydrophobic self-assembled monolayer. The adsorption process was characterized using surface plasmon resonance, while contact angle measurements were used to monitor the resulting wetting behavior. Th…