Materials Literature
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We consider a melt of diblock copolymers consisting of a linear A block connected to a regularly branched B block. A simple “Alexander−de Gennes”-type calculation of the free energy for lamellar, cylindrical, and spherical microphases in strong segregation reveals large shifts in the phase boundaries as a function of…
The spreading of low molecular weight silicon oils (PDMS) on heterogeneous substrates has been studied by spectroscopic ellipsometry. Using different grafting times, we produced partially OTS-grafted substrates whose surface energy ranged from that of the bare silica surface (about 28 mN/m) to that of the completely O…
Samples in the MgO−TiO 2 system were prepared via the sol−gel technique with titanium and magnesium ethoxides as precursors and HNO 3 as hydrolysis catalyst. The analyzed magnesia to titania weight ratios were 0.1:0.9, 0.5:0.5, and 0.9:0.1 (0.05, 0.5, and 4.0 MgO:TiO 2 molar ratios). Samples were characterized with X-…
In this paper we study the phase behavior of blends of associating homopolymers A and B in the weak segregation regime. The homopolymers are “associating” in the sense that hydrogen bonds are possible between the A chains and the B chains. Hydrogen bonds between two A chains, or between two B chains, are not possible.…
Organized molecular systems (OMS) have been widely used in the formation of mineral solids to control their composition, morphology, and dimensions. In this paper, we synthesized tricalcium phosphate by mixing two microemulsions, one containing calcium in its aqueous phase, the other containing phosphate. The microemu…
The highly substituted dioxoruthenium(VI) porphyrins [Ru VI (DPP)O 2 ] ( 1a; H 2 DPP = 2,3,5,7,8,10,12,13,15,17,18,20-dodecaphenylporphyrin), [Ru VI (TDCPP)O 2 ] ( 1b; H 2 TDCPP = meso -tetrakis(2,6-dichlorophenyl)porphyrin), and [Ru VI (TMOPP)O 2 ] ( 1c; H 2 TMOPP = meso -tetrakis(2,4,6-trimethoxyphenyl)porphyrin) ar…
We report on the synthesis and the properties of side-chain liquid-crystal polymer (LCP) brushes attached to silicon oxide surfaces. The polymer monolayers have been generated at the surface of the substrate in situ following a “grafting-from” procedure. The mesogenic group of the LC brushes consists of a phenylbenzoa…
The phase behavior of Zr(SO 4 ) 2 /CTAB composite mesophases was investigated as a function of surfactant chain length, temperature, and salt concentration by XRD. It was shown that the initial step is a rapid formation of either a pure lamellar, hexagonal, or a mixed hexagonal/lamellar phase with a low degree of cond…
The synthesis of novel dendrimers functionalized with laser dyes both at the periphery and at the core, along with all relevant model compounds necessary for accurate photophysical studies, is described. The utilized synthetic strategy involves a modular approach in which a variety of peripheral and core moieties can…
A morphological study of three A 5 B, six-arm miktoarm star block copolymers is presented. The miktoarm stars are comprised of five arms of polyisoprene and one arm of polystyrene joined together at a single junction point. The strong segregation limit theory for the morphological behavior of miktoarm stars predicts t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTIncorporation of Metal Nanoparticles into Block Copolymer Nanodomains via in-Situ Reduction of Metal Ions in Microdomain SpaceTakeji Hashimoto, Masafumi Harada, and Naoki SakamotoView Author Information Hashimoto Polymer Phasing Pro…
Poly(propyleneimine)-based liquid crystalline dendrimers ( PPILCDs ) with a relatively flexible dendritic scaffold were successfully prepared by the Michael addition reaction of poly(propyleneimine)s with ω-(4‘-cyanobiphenyloxy)alkyl acrylate (1) . The structures of PPILCDs were characterized by IR spectroscopy, 1 H N…
In this paper we describe how pore-structure modification can be achieved in a highly ordered fashion through the use of bolaform surfactants containing a rigid unit in the hydrophobic chain. The silicate mesophase, SBA-8, synthesized using bolaform surfactants at room temperature, is a two-dimensional (2-D) pore stru…
A new synthetic method has been developed for preparing silver sulfide, Ag 2 S, nanoparticles capped with cysteine or glutathione. The average particle diameter has been determined to be around 9 nm using transmission electron microscopy. The ground-state electronic absorption spectra of the Ag 2 S nanoparticles show…
Iron(III) oxide nanoparticles were synthesized within mesoporous MCM-48 silica phases. By using multiple cycles of wet impregnation, drying, and calcination procedures, it was possible to form haematite nanoparticles almost exclusively within the pore system. Nitrogen sorption measurements still revealed mesoporosity…
Formation of clusters of interstitial carbon atoms between the surface and second atomic layers of graphite is demonstrated by means of molecular dynamics simulations. It is shown that interstitial clusters result in the dome-like surface features that may be associated with some of the hillocks observed by STM on the…
The difficulty in processing filled materials is often a limiting factor in advanced materials development because of the large changes in fluid viscosity observed in these materials. It is widely ...
The spontaneous spreading of liquid droplets is studied by molecular modeling simulations. By considering very large systems, we are able to study the influence of the solid−liquid interactions on the overall wetting dynamics. It is shown how microscopic parameters, such as the mobility of the molecules near the solid…
The vibrational properties of poly(3,4-ethylenedioxythiophene) (PEDT) have been studied by means of UV−vis−NIR optical absorption spectroscopy and resonance Raman scattering (RRS) spectroscopy with two excitation lines: green (514 nm) and infrared (1064 nm). The two-step oxidative doping process does not induce a dras…
The stability of axisymmetric steady thermocapillary convection of electrically conducting fluids in half-zones under the influence of a static axial magnetic field is investigated numerically by linear stability theory. In addition, the energy transfer between the basic state and a disturbance is considered in order…