Materials Literature
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[structure: see text] A series of the title dimeric quinquethiophenes linked with a di- to hexamethylene spacer was synthesized and examined as a pi-dimer model of polythiophene. Upon two-electron oxidation with iron(III) chloride in dichloromethane, they readily form intramolecular pi-dimer species, except for the di…
Abstract We successfully formed a series of inclusion complexes (ICs) between an α‐cyclodextrin (α‐CD) host and two kinds of guest polymers, nylon‐6 and nylon‐66. An attempt to achieve an intimate blend between nylon‐6 and nylon‐66 through the formation and dissociation of their common α‐CD IC was made. The formation…
On the basis of temperature-programmed desorption and isothermal reaction mass spectrometry, the thermal surface chemistry of trimethyl acetic acid, (CH 3 ) 3 CCOOH, dosed onto a well-characterized single-crystal TiO 2 (110) surface is described. Deprotonation occurs at or below 300 K to form trimethyl acetate, (CH 3…
New optically active hyperbranched polymers have been used as microenvironments as well as scaffolds for noncovalent and covalent immobilization of pincer platinum(II) complexes, respectively. The catalytic activity/selectivity of the incorporated platinum(II) complexes in these polymeric chiral supports was investiga…
Blue phases (BPs) are cubic phases of cholesteric liquid crystals (CLC) with a sufficiently short pitch. They occur in three different phases (BPI, BPII, BPIII) in small temperature ranges between the cholesteric and the isotropic state. Light reflected by BP crystals is partially circularly polarized. Calculating the…
A new formulation of the polymer reference interaction site model (PRISM) theory for suspensions of hard spheres and rigid rods has been developed. The nonlocal loss of orientational entropy when a rod is near an impenetrable particle is accounted for in a thermodynamically self-consistent manner. In the ideal needle…
Abstract Reactions of gold phosphane complexes [(AuX)(PR 3 )] (X = Cl, Br, I; R = organic moiety) with Se(SiMe 3 ) 2 lead to the formation of gold complexes with chalcogenide bridges. The reaction of the complex [Ph 3 PAuCl] and t BuSe(SiMe 3 ) gives the cluster [Au 5 Se 2 (PPh 3 ) 4 ]Cl ( 1 ). The in situ preparation…
Bulk and surface energies are calculated for endmembers of the isostructural rhombohedral carbonate mineral family, including Ca, Cd, Co, Fe, Mg, Mn, Ni, and Zn compositions. The calculations for the bulk agree with the densities, bond distances, bond angles, and lattice enthalpies reported in the literature. The calc…
The thermal decomposition of methyltrichlorosilane (MTS) was studied in a flow system in the temperature range of 825−977 K and pressure range of 10−120 Torr. Yields of products were measured by gas chromatography. The rate constant, k 1, for the initiation reaction was determined from the sum of the rates of the term…
Abstract Pr 6 O 11 single‐crystal nanotubes with a typical 3‐D crystal structure in the bulk have been successfully obtained through a template‐free molten‐salt synthetic method, the formation of which has been attributed to the periodical defect cluster distribution in the Pr 6 O 11 species. It is believed that the s…
Abstract In the field of organic‐inorganic hybrid composites, functionalized polyoxometalates constitute a special class of inorganic nanobuilding blocks (NBBs). This study represents a first approach related to the formation of new oligomeric hybrid species based on the reaction of bis(electrophilic) groups with a di…
A new three-dimensional finite element method model of the conventional resistive thermal probe, usually employed within scanning thermal microscopy (SThM) has been developed. As a result, the line heat source characteristic of the bent thermal sensitive filament seems to permit the explanation of the experimental res…
The synthesis of poly(hydridocarbyne), one of a class of carbon-based random network polymers and a structural isomer of polyacetlyene, is reported. The network backbone of this polymer is primarily composed of tetrahedrally hybridized carbon atoms, each bearing one hydride substituent and linked via three carbon-carb…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Abdulwahab S. Almusallam, Ronald G. Larson, Michael J. Solomon; Comprehensive constitutive model…
Abstract Reactions of an LFe III unit with an M(PyA) 3 n − ion prepared in situ, where L represents 1,4,7‐trimethyl‐1,4,7‐triazacyclononane and PyA − is the monoanion of pyridin‐2‐aldoxime, yield heterodinuclear cations of the general formula [LFe III (PyA) 3 M] 2+ , where M = Zn II ( 1 ), Cu II ( 2 ), Ni II ( 3 ), lo…
The structures of self-assembled peptide amphiphiles are studied using empirical force fields and atomistic molecular dynamics calculations. The hydrophilic headgroups of these amphiphiles possess a lower, rigid part and an upper, flexible part. At an appropriate pH large dipoles are found in the flexible part of the…
We describe a new salt-assisted aero-sol-gel approach to produce spherical nanosized mesoporous silica particles. As an alternative to expensive templating mediums in prior works, salt (NaCl) was employed as a templating medium because it is thermally stable, recyclable, and easily leached. Furthermore, we demonstrate…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Jeffrey C. Haley, Timothy P. Lodge; A framework for predicting the viscosity of miscible polymer…
The oriented crystallization of poly(1,4-butylene succinate) (PBSU) in the oriented blend with poly(vinylidene fluoride) (PVDF) was investigated at various temperatures. Films of the miscible blend with a composition of PBSU/PVDF = 30/70 (wt %) were prepared by solution casting and were subsequently quenched in ice wa…
A structural study of orthorhombic molybdenum trioxide ${\mathrm{MoO}}_{3}$ with a layered structure has been performed using synchrotron-radiation powder diffraction from 110 to 1000 K. ${\mathrm{MoO}}_{3}$ exhibits an anisotropic thermal expansion. With increasing temperature, the lattice expands remarkably along th…