Two Frustrated, Bitetrahedral Single-Molecule Magnets
Two unusual mixed-valent {MnIII6MnII} bitetrahedra display frustrated magnetic exchange, leading to S = 13/2 +/- 1 and 11/2 +/- 1 ground states and slow magnetization relaxation.
Materials Literature
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Expeditious Synthesis of Glycosylated Phthalocyanines
3,4-Dicyanophenyl O- and S-glycosides in the gluco, galacto, lacto, and cellobiose series were prepared in virtually quantitative yield through nucleophilic aromatic substitution of 4-nitrophthalonitrile with acetyl-protected glycoses and 1-thio-glycoses. Similarly, 2-(3,4-dicyanophenoxy)ethyl 2,3,4,6-tetra-O-acetyl-β…
Direct calculation of the optical constants for a thin film using a midpoint envelope
An algebraic method to calculate the optical constants for a weakly absorbing thin film from the spectrum of normal reflectance is described. The calculation of the refractive index of the thin film is simplified by constructing a midpoint envelope through the reflection spectrum. If a portion of the spectrum includes…
Continuous Synthesis of Tin and Indium Oxide Nanoparticles in Sub‐ and Supercritical Water
Nanocrystalline tin and indium oxides (In 2 O 3 /SnO 2 ) were synthesized in sub‐ and supercritical water at 350°/380°C and 30 MPa in <73 s in a tubular flow reactor from an aqueous solution of {SnCl 4 +InCl 3 } (0.2 M ). The conversion rate for tin was 100%. Nanoparticles were analyzed by transmission electron mic…
Micromechanical deformation processes in PA/layered silicate nanocomposites: Correlation of structure and properties
Abstract Polyamide/organophilic montmorillonite nanocomposites were prepared from two silicates with different organophilization resulting in strong and weak matrix/silicate adhesion, respectively; uncoated sodium montmorillonite was used as reference. The silicate content of the composites changed between 0 and 10 vo…
Studies on the photo‐oxidation of PP and PP/mLLDPE blend systems: Thermal, physicochemical, and mechanical behavior
Abstract The photo‐oxidative degradation of the blends of polypropylene (PP) with metallocene linear low density polyethylene (mLLDPE) were studied. The blend samples were exposed to the ultraviolet radiation (UV) for a period of 6 weeks. Tensile mechanical characteristics were derived from stress–strain curves. The c…
Carbon Powders Prepared by Ultrasonic Spray Pyrolysis of Substituted Alkali Benzoates
Ultrasonic spray pyrolysis (USP) has been used to prepare carbon spheres from aqueous solutions of substituted alkali benzoate salts. The size of the carbon spheres produced during USP can easily be controlled simply by changing the concentration of the precursor solution. Both the cation and the ring substituents of…
Resonant Raman scattering at exciton intermediate states in ZnO
Abstract We present results on resonant Raman scattering in single crystal ZnO using a continuously tuneable excitation in the energy region of the free and bound excitons. The PL and Raman spectra show the presence of a dominant luminescence band at 3.310 eV as well as the A 1 (TO), E 2 (high), E 1 (LO), and 2E 1 (LO…
Negative refraction and cross polarization effects in metamaterial realized with bianisotropic S-ring resonator
The refraction and propagation properties of left-handed materials with bianisotropic effects are investigated. We show that the dispersion relation of the material is strongly influenced by the inclusion of chirality; therefore, different refraction behaviors are observed corresponding to different values of the chir…
Recycled PET nanocomposites improved by silanization of organoclays
Abstract Recycled PET/organo‐modified montmorillonite nanocomposites were prepared via melt compounding as a promising possibility of the used beverage bottles recovery. According to our previous work, the three suitable commercial organoclays Cloisite 25A, 10A, and 30B were additionally modified with [3‐(glycidyloxy)…
Improving PPy Adhesion by Surface Roughening
Conjugated polymers have found applications as “artificial muscles” because they undergo significant volume change upon electrochemical cycling. However, this large repeated strain also leads them to delaminate from the underlying electrode. Two methods of improving the adhesion of polypyrrole films to Au electrodes d…
Synthesis and Properties of Mesogen-Jacketed Liquid Crystalline Polymers with Asymmetry Mesogenic Core
Smectic A (S A ) liquid crystalline phase developed from a new kind of mesogen-jacketed liquid crystalline polymer (MJLCP) whose mesogenic side groups are asymmetrically bonded to the main-chain was first reported. Two series of MJLCPs, poly[4,4‘-bis(4-butoxyphenyloxycarbonyl)-2-vinylbiphenyl] (PBP2VBP) and poly[4,4‘-…
Automated In-line Technique Using FBRM to Achieve Consistent Product Quality in Cooling Crystallization
An in-line technique involving focused beam reflectance measurement (FBRM) for control of crystal product quality in unseeded systems is proposed. The method consists of nucleation detection followed by a holding time to internally generate seeds through primary nucleation and then controlled conditioning of these see…
Dynamics of Carbon Nanotube Growth from Fullerenes
The growth of double-walled carbon nanotubes from peapods was studied. The transformation was monitored by the decrease of fullerene Raman lines, the growth of inner tube Raman lines, and the development of X-ray diffraction patterns. A visual check of the growth process by HRTEM provided additional information. From…
Shape Evolution of Pb (Zr,Ti)O 3 Nanocrystals Under Hydrothermal Conditions
Pb (Zr,Ti)O 3 nanocrystals with different morphologies have been prepared hydrothermally with poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAA) as surfactants. The morphology of Pb (Zr,Ti)O 3 nanocrystals develops from a particle to a rod and then a wire by adjusting the ratio of PVA/PAA and reaction time in a hy…
Influence of Anodic Conditions on Self-ordered Growth of Highly Aligned Titanium Oxide Nanopores
Self-aligned nanoporous TiO 2 templates synthesized via dc current electrochemical anodization have been carefully analyzed. The influence of environmental temperature during the anodization, ranging from 2 °C to ambient, on the structure and morphology of the nanoporous oxide formation has been investigated, as well…
Structural analysis of poly[( R,S )‐3‐hydroxybutyrate‐ co ‐L‐lactide] copolyesters by electrospray ionization ion trap mass spectrometry
Two random copolyesters of poly[(R,S)-3-hydroxybutyrate-co-L-lactide] (P[(R,S)-3HB-co-LA]), prepared by equimolar reaction of (R,S)-beta-butyrolactone with L-lactic acid and (R,S)-3-hydroxybutyric acid with L-lactide, respectively, were characterized by electrospray ionization ion trap mass spectrometry (ESI-ITMS). De…
Alkynyl Expanded Donor–Acceptor Calixarenes: Geometry and Second‐Order Nonlinear Optical Properties
A number of wide- and narrow-rimmed functionalized alkynylcalix[4]arenes have been synthesized by Sonogashira coupling. With respect to their optical properties, these donor-acceptor systems are treated as ensembles of covalently linked, electronically independent tolane subchromophores. Linear UV/visible and fluoresc…
Study of surface and adhesive properties of polypropylene grafted by maleic anhydride
Abstract The surface and adhesive properties of isotactic polypropylene (iPP) grafted by maleic anhydride (MA) have been investigated. The attention has been paid to the analysis of the change in hydrophilicity as well as to the interfacial equilibrium and mechanical work of the adhesion of MA grafted iPP copolymer (i…
Determination of DNA-Base Orientation on Carbon Nanotubes through Directional Optical Absorbance
We develop an approach for determining the orientation of DNA bases attached to carbon nanotubes (CNTs), by combining ab initio time-dependent density functional theory and optical spectroscopy measurements. The structures we find are in good agreement with the geometry of nucleosides on a (10,0) CNT obtained from mol…