One‐Dimensional Nanostructures: Synthesis, Characterization, and Applications
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Binding of Poly(amido amine) Dendrimer on Sodium Poly-l-glutamate in Aqueous NaCl Solution
Binding of poly(amido amine) dendrimer on sodium poly- l -glutamate (NaPGA) in aqueous solutions of 0.01 and 0.1 M NaCl has been investigated by static light scattering. It was observed that the weight-average molecular weight and the radius of gyration increase sharply, when a certain molar ratio of dendrimer to NaPG…
Influence of recycling and contamination on structure and transport properties of polypropylene
Abstract In this work the effect of three processing cycles on the physical properties of polypropylene (PP) was studied and related to the changes in the structure (molecular weight, molecular weight distribution, morphology) occurring during recycling. In order to simulate both the use and the recycling process of P…
Synthesis of a high‐trans 1,4‐butadiene/isoprene copolymers with supported titanium catalysts
Abstract The copolymerization of butadiene (Bd) and isoprene (Ip) with a supported titanium‐triisobutyl aluminum catalyst system was studied. An analysis using differential scanning calorimetry, X‐ray diffraction, and 13 C‐NMR spectra indicated that products with 25–60 mol % Bd units were random copolymers and that th…
Dielectric, piezoelectric, and elastic properties of the Rochelle saltNaKC4H4O6⋅4H2O: A theory
We modify the conventional Mitsui model by including the terms related to piezoelectric coupling with shear strain ${\ensuremath{\varepsilon}}_{4}.$ The static and dynamic dielectric, piezoelectric, and elastic characteristics of a Rochelle salt crystal are calculated. It is shown that taking into account piezoelectri…
Classical ground states of symmetric Heisenberg spin systems
We investigate the ground states of classical Heisenberg spin systems which have point group symmetry. Examples are the regular polygons (spin rings) and the seven quasi-regular polyhedra including the five Platonic solids. For these examples, ground states with special properties, e.g. coplanarity or symmetry, can be…
Size dependence of optical properties in solution-grown Pb1 xFexS nanoparticle films
The optical band gap ( E g ) of Pb 1− x Fe x S solution-grown nanoparticle films was varied from 2.65 to 2.22 eV with an increase in iron concentration 0.25 ≤ x ≤ 0.75 in films grown at fixed pH and temperature by the chemical bath deposition method. The presence of excitonic structure in the ternary Pb 1− x Fe x S fo…
Oil absorbents based on styrene–butadiene rubber
Abstract Four oil absorbents based on styrene–butadiene (SBR)—pure SBR (PS), 4‐tert‐ butylstyrene–SBR (PBS), EPDM–SBR network (PES), and 4‐tert‐ butylstyrene‐EPDM‐SBR (PBES)—were produced from crosslinking polymerization of uncured styrene–butadiene rubber (SBR), 4‐tert‐ butylstyrene (tBS), and ethylene–propylene–dien…
Generation of Metal Nanoparticles on Montmorillonite K 10 and Their Characterization
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTGeneration of Metal Nanoparticles on Montmorillonite K 10 and Their CharacterizationOmar S. Ahmed and Dipak K. DuttaView Author Information Department of Chemistry, Bahona College, Bahona 785101, Jorhat, Assam, India Material Science Division, Regional Research Laboratory (CSIR…
A Photochromic, Electrochromic, Thermochromic Ru Complexed Benzannulene: an Organometallic Example of the Dimethyldihydropyrene−Metacyclophanediene Valence Isomerization
The preparation of the first photochromic, organometallic derivative of the diarylethene class, the CpRu-complexed benzodimethyldihydropyrene 3, in which the organometallic is directly attached to the photochromic core, is described. The negative dark purple photochrome 3 readily bleaches to form the almost colorless…
Structure and Magnetic Properties of Layered High-Spin Co(II)(l-threonine)2(H2O)2
We report the structure and the magnetic properties of a cobalt(II) compound with the amino acid l-threonine, Co(C(4)H(8)NO(3))(2)(H(2)O)(2). It crystallizes in the orthorhombic chiral space group C222(1), with a = 5.843(5) A, b = 10.120(10) A, c = 22.36(3) A, and Z = 4. The Co(II) ion is in a deformed octahedral envi…
Photoinduced Electron Transfer between the Interlocked Components of Porphyrin Catenanes: Effect of the Presence of Nonequivalent Reduction Sites on the Charge Recombination Rate
[2]Catenanes made up of several polyether-strapped porphyrin macrocycles interlinked with the cyclic electron acceptor cyclobis(paraquat-p-phenylene) were spectroscopically, photophysically, and electrochemically characterized. The catenanes exhibit very rich redox behavior due to the presence of several different and…
Optical characterization and crystal structure of the novel bronzetype CaxBa1‐xNb2O6 (x = 0.28; CBN‐28)
Abstract Calcium barium niobate (CBN), also like strontium barium niobate (SBN), belongs to the materials family of partially filled tetragonal tungsten bronzes, which show relaxor‐type ferroelectric phase transitions and large electro‐optic effects. For the first time, it was possible to grow large single crystals of…
A novel approach of chemical functionalization on nano-scaled silica particles
Chemical functionalization on nano-scaled silica particles was performed through the reaction between the silanol group of silica and the oxirane ring of epoxy compounds. The occurrence of the surface functionalization and the chemical structures of the resulting products were characterized with FTIR and 1 H NMR. Ener…
Effect of coagulation conditions on properties of poly(acrylonitrile–carboxylic acid) fibers
Abstract Acrylic fibers are among the most useful synthetic fibers for textile applications, and special acrylic fiber (SAF) has industrial applications. The physical and mechanical properties of fiber are affected by several parameters; one such parameter is coagulation conditions: bath temperature, bath composition,…
Controlling Short‐ and Long‐Range Electron Transfer Processes in Molecular Dyads and Triads
Novel pi-extended tetrathiafulvalene (exTTF)-based donor acceptor hybrids-dyads and triads-have been synthesized following a multistep synthetic procedure. Cyclic voltammetry and absorption spectroscopy, conducted in room temperature solutions, reveal features that are identical to the sum of the separate donor and ac…
Lung cancer risk in workers exposed to poly(vinyl chloride) dust: a nested case-referent study
BACKGROUND: There have been few investigations of an association between poly(vinyl chloride) (PVC) dust exposure and an increase in lung cancer incidence, and their conclusions have been inconsistent. AIMS: To determine whether PVC and/or vinyl chloride monomer (VCM) is the associated risk factor(s), by means of a ne…
Some physical and magnetic properties of Mg‐Zn ferrite
Abstract Some physical properties (such as lattice parameter, density and porosity) and magnetic properties of the system Mg 1‐x Zn x Fe 2 O 4 ; where x=0,0.1,0.2,0.3,0.4,0.5and 0.6 have been studied. It was found that the lattice parameter increases with increasing the zinc concentration. The composition dependence o…
Crystallization of an Ordered Mesoporous Nb–Ta Oxide
The ordered pore structure of 2D hexagonally ordered mesoporous niobium and tantalum mixed oxide has been successfully preserved during crystallization by filling the pores of the precursor with carbon prior to crystallization. Subsequent thermal treatment in an inert atmosphere produces the crystallized product witho…
The Geology and Origin of Sepiolite, Palygorskite and Saponite in Neogene Lacustrine Sediments of the Serinhisar-Acipayam Basin, Denizli, SW Turkey
Abstract The Serinhisar-Acıpayam basin of western Anatolia hosts a Neogene alkaline lake which formed in some graben and semi-graben depression zones as a result of N–S tension. The basin is filled with fluvial and lacustrine sediments dominated by clayey materials. The filling of the basin with fine sediments and ass…