Materials Literature
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In the present study, the role of α-relaxation toward isothermal crystallization of amorphous celecoxib was studied using dielectric spectroscopy (DES). The dielectric response of the α-relaxation was measured as a function of frequency (10⁻¹ to 10⁶ Hz), isothermally at every 4 K interval in the range of 303.15 to 443…
Charge equilibration models such as the electronegativity equalization method (EEM) and the split charge equilibration (SQE) are extensively used in the literature for the efficient computation of accurate atomic charges in molecules. However, there is no consensus on a generic set of optimal parameters, even when one…
The supramolecular architectures of a fluorophore are controlled through the design of a conjugated polycatenar molecule, the self-assembly of which can be addressed toward a columnar liquid-crystalline phase and organogels. Thus, depending on the environmental conditions for self-assembly, compound CA9 organizes into…
Core/shell quantum dots (CdSe/Zns) conjugated with various nuclear localization signaling (NLS) peptides, which could facilitate the transportation of quantum dots across the plasma membrane into the nucleus, have been utilized to investigate the uptake mechanism of targeted delivery. Because of their brightness and p…
MgO‐doped Ba 0.55 Sr 0.45 TiO 3 ceramics were prepared by solid‐state reaction technique and their phase compositions, microstructure and dielectric properties were systematically characterized. Their dielectric peaks were markedly suppressed, broadened, and shifted to low temperatures with increasing MgO content, ind…
We report the formation of a double-gyroid network morphology in normal-tapered poly(isoprene-b-isoprene/styrene-b-styrene) [P(I-IS-S)] and inverse-tapered poly(isoprene-b- styrene/isoprene-b-styrene) [P(I-SI-S)] diblock copolymers. Our tapered diblock copolymers with overall poly(styrene) volume fractions of 0.65 (no…
This article describes the mineralization behavior of CaCO(3) crystals on electrospun cellulose acetate (CA) fibers by using poly(acrylic acid) (PAA) as a crystal growth modifier and further templating synthesis of CaCO(3) microtubes. Calcite film coatings composed of nanoneedles can form on the surfaces of CA fibers…
In this article we study shape-memory behavior of hydrogels, formed by biodegradable and biocompatible recombinant telechelic polypeptides, with collagen-like end blocks and a random coil-like middle block. The programmed shape of these hydrogels was achieved by chemical cross-linking of lysine residues present in the…
Abstract A good dispersion of single‐walled carbon nanotubes (SWCNTs) in liquid media is a prerequisite to fulfill many of their applications. This contribution reports an efficient approach to additive‐free dispersion of SWCNTs with the aid of functionalized carbonaceous byproducts (CBs, e.g., amorphous carbon, carbo…
A self-complementary Hamilton-receptor-functionalized merocyanine dye has been synthesized by incorporating a hydrogen bonding receptor site to the donor moiety of a merocyanine chromophore that bears a barbituric acid acceptor unit. The optical and electro-optical properties of monomeric dyes have been studied by UV–…
Impurity-dependent photoresponse properties of semiconductor nanostructures are studied for the first time in the photodetectors (PDs) made from intrinsic (i-) and extrinsic n-type single CdSe nanobelts (NBs). Both ohmic and Schottky contact based CdSe NB PDs were studied. The sizes of i- and n- NBs were purposely cho…
First-principles study of boron (B)-doped silicon nanocrystals (Si NCs) at 0 K in the framework of density functional theory has been carried out. It is found that B prefers residing at the surface of Si NCs, similar to phosphorus (P). Different from P, B induces surface restructuring when B is one- or two-coordinated…
Polarization rotation in isotropic materials is commonly associated with chirality, i.e., structures with a handedness which are not identical with their mirror image. We observe this effect in the visible and near-IR regions at oblique incidence in the optical response of a subwavelength square array of holes. Mappin…
Herein, we reported an approach to synthesize few-layered graphene by etching of the graphite using H2O2 plasma technique. The synthesized few-layered graphene was characterized by scanning electron microscopy, atomic force microscopy, Raman spectroscopy, and x-ray photoelectron spectroscopy (XPS). The analysis showed…
A model for the thermoelectric properties of nanowires was used to demonstrate the contrasting influences of quantization and degeneracy on the thermoelectric power factor. The prevailing notion that quantum confinement benefits the thermoelectric power factor is supported by the model when a single-subband dominates…
Covalent addition reactions turned out to be one of the most important functionalization techniques for a structural alteration of single walled carbon nanotube (SWCNT) scaffolds. During the last years, several reaction sequences based on an electrophilic interception of intermediately generated SWCNT(n-) carbanions,…
Abstract Waxy maize starch was hydrolyzed with sulfuric acid in aqueous solution. The remaining starch granules after acid hydrolysis were characterized by TEM and wide‐angle XRD. Starch nanocrystals with size between 40 to 80 nm and relative crystallinity of 63% were obtained after 6 days of hydrolysis. Starch nanocr…
Abstract A series of star‐shaped poly(2‐ethyl‐2‐oxazoline)s was prepared by cationic polymerization. The polymerization was initiated by dipentaerythrityl hexakis(4‐nitrobenzene sulfonate) and a tosylated hyperbranched polymer of glycidol. The polymerization proceeded in a controlled manner. The star structure of the…
This paper addresses the behavior of thermoplastic polymers and polymer nanocomposites prior to ignition, under irradiation in a cone calorimeter. Insights into the physical evolution of material controlling ignition are obtained from the measurement of the condensed phase surface temperature and by the observation of…
Abstract Bicontinuous, interfacially jammed emulsion gels (bijels) are a class of soft solid materials in which interpenetrating domains of two immiscible fluids are stabilized by an interfacial colloidal monolayer. Such structures form through the arrest of the spinodal decomposition of an initially single‐phase liqu…