Materials Literature
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We report the realization of large-area, communications-wavelength electro-optic modulators made via simple solution-casting onto an arbitrary substrate. The devices employ colloidal quantum dots synthesized in, and processed from, the solution phase. Devices exhibit greater than 30% modulation depth at the 1.55 micro…
A novel series of organosoluble poly(ether imide)s containing nitrile groups was prepared by solution polycondensation reaction of an aromatic diamine, namely 4-[bis(4-aminophenyl)amino]benzonitrile with different aromatic bis(ether anhydride)s, such as 2,2-bis[(3,4-dicarboxyphenoxy)phenyl]propane dianhydride, 1,1,1,3…
Abstract Anionic poly( p ‐phenylene‐ethynylene) (PPE) incorporated polymer hybrids were synthesized from the PPE and tetramethoxysilane together with the organic polymers such as poly(vinylpyrrolidone) via a sol–gel method. Up to 10 wt % of the anionic PPE could be dispersed homogeneously in the resulting polymer hybr…
The circular dichroism spectra of the complexes Co(acac)3, [Co(ox)3]3-, [Co(mal)3]3-, and [Co(Thiox)3]3- with acac=acetylacetonate, ox=oxalate, mal=malonate, Thiox=dithioxalate, have been investigated computationally employing time-dependent density functional theory. A detailed comparison of the experimental and theo…
Abstract Thin films of crosslinked polymethylhydrosiloxane (PMHS) have been grafted on silica using the sol–gel process allowing further functionalization by effective quantitative hydrosilylation of SiH groups by olefins within the network. Postfunctionalization gives the polysiloxane network with n ‐alkyl side chain…
The dielectric response of ferroelectric Sr 1- x Ca x TiO 3 (SCT) under photoexcitation has been investigated. We observed photoinduced Debye dispersion, which is similar to that observed in nominally pure SrTiO 3 . The temperature dependence of photoinduced Debye dispersion in SCT indicates that the origin of photoin…
We report a strategy to achieve a material showing equal intensity double plasmon resonance (EIDPR) based on sandwich geometry. We studied the interaction between localized plasmon resonances associated with different metal clusters (Au/Ag) on Teflon AF (TAF) in sandwich geometry. Engineering the EIDPR was done by tai…
Abstract A new electrochromic polymer, poly(2,3,5,8‐tetra(thiophen‐2‐yl)quinoxaline) (PTTQ), was synthesized electrochemically and its electrochromic properties were investigated. The polymer was characterized by Cyclic Voltammetry, Fourier Transform infrared spectroscopy, UV‐Vis‐NIR Spectroscopy, and colorimetry. Spe…
A thermal-mechanical model is presented for calculating the residual compressive strength of flammable sandwich composite materials in fire. The model can also estimate the time-to-failure of the laminate face skin to sandwich composites exposed to fire. The model involves a two-stage analysis: thermal modeling and me…
The cure kinetics of the blends of Low density polyethylene (LDPE) and Polydimethyl siloxane rubber (PDMS) (50 : 50 w/w) with different proportion of ethylene methyl acrylate (EMA) copolymer as an in situ compatibilizer, is studied by differential scanning calorimetry (DSC) and rheometry, using dicumyl peroxide (DCP)…
Quantum dots are of considerable interest as highly detectable labels with broad absorption, narrow spectral emission and good quantum yields. The luminescence emission has a longer decay time than that of the most common fluorophores, leading to facile rejection of much background emission (such as autofluorescence f…
A series of phenylethynyl-endcapped fluorinated aromatic oligoimides with calculated molecular weights of 1250—10000 were prepared by thermal polycondensation of an aromatic dianhydride, 4,4'oxydiphthalic anhydride (ODPA), with aromatic diamine mixtures of 1,4-bis(4-amino-2-trifluoromethylphenoxy)-benzene (1,4,4-6FAPB…
Poly(lactic acid) (PLA)/organo-montmorillonite (OMMT) nanocomposites were prepared by using both solution intercalation and melt intercalation methods. Maleic anhydride grafted ethylene propylene rubber (EPM-g-MAH) was used as a toughening agent for the PLA/OMMT nanocomposites. The flexural properties of PLA/OMMT nano…
This work examines the foam density, average cell sizes, and cell structure of four polystyrene (PS) blended with calcium carbonate (CaCO 3 ) or low density polyethylene (LDPE) at various ratios. The PS/CaCO 3 and PS/LDPE are foamed by carbon dioxide (CO 2 ) under supercritical conditions. CaCO 3 and LDPE can strongly…
Abstract Polypropylene/organic‐montmorillonite (PP/OMMT) nanocomposites were prepared via a solid‐phase PP graft (TMPP) with a higher grafting level as the compatibilizer. The effects of the compatibilizer on the structure and properties of PP/OMMT nanocomposites were investigated. The structure of the nanocomposites…
Alternatives for replacing the expensive ITO are explored and Poly(ethylene dioxythiophene):polystyrene sulfonate (PEDOT:PSS) is introduced as one possibility. We present the first small-molecule organic solar cells employing only PEDOT:PSS as transparent electrode. Solar cells on glass and on flexible plastic foil we…
This paper presents a series of processes for fabricating lead-zirconate-titanate (PZT) microstructures on a silicon substrate. An aerosol deposition method was used to deposit PZT thick film at room temperature. The low temperature deposition enabled a special lift-off process for patterning thick PZT films using a T…
Carbon- and boron-2 p states of superconducting and non-superconducting boron-doped diamond (BDD) samples are measured using soft X-ray emission and absorption spectroscopy (XES and XAS) near C- and B-K edges. The electronic structure of B 2 p does not show a marked boron-doping dependence, except that a considerable…
Novel semi-cycloaliphatic (semi-alicyclic) colorless polybenzoxazoles (PBOs) were polycondensed from 3,3'-diamino-4,4'-dihydroxydiphenylsulfone (ABPS) with several cyclohexanedicarboxylic acid (CHDCA) isomers in poly(phosphoric acid) (PPA) at an elevated temperature. The PBO system derived from ABPS with 1,4-CHDCA (tr…
Abstract Four different substituted 1,3,5‐benzenetrisamides were synthesized and two of them were reported for the first time. Their effects on the crystal structure and morphologies of the iPP homopolymer (PPH) and propylene‐ethylene random copolymers (PPR) were investigated. The results showed that they had versatil…