Materials Literature
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Semiconducting polymer dot (Pdot) bioconjugates are a new class of ultrabright fluorescent probes. Here, we report a procedure for lyophilizing Pdot bioconjugates so that they successfully retain their optical properties, colloidal stability, and cell-targeting capability during storage. We found that, when Pdot bioco…
Abstract Four azide–copper coordination polymers, [Cu2L1(N3)4]n, [Cu2L2(N3)4]n, [Cu2L3R(N3)4]n, and [Cu2L3S(N3)4]n, were synthesized by using pybox [pyridine‐2,6‐bis(oxazolines)] as coligands {L1: 2,6‐bis(4,5‐dihydrooxazol‐2‐yl)pyridine; L2: 2,6‐bis(5,6‐dihydro‐4H‐1,3‐oxazin‐2‐yl)pyridine; L3R or 3S: 2,6‐bis[(R or S)‐…
Two‐step hydrothermal synthesis of platelike potassium sodium niobate ( K , Na ) NbO 3 ( KNN ) template particles was investigated. Platelike K 4 Na 4 Nb 6 O 19 ·9 H 2 O ( KNN ‐hydrate) particles were synthesized in 4 mol/L aqueous alkali at 150°C by the sodium dodecyl benzene sulfonate ( SDBS ) surfactant‐assisted hy…
Er 3+ / Yb 3+ / Li + ‐tridoped Y 2 Ti 2 O 7 nanophosphors were synthesized via a facile sol–gel process. The samples were characterized by the inductively coupled plasma atomic emission spectrometer (ICP‐AES), X ‐ray diffraction ( XRD ), transmission electron microscopy ( TEM ), and infrared‐to‐visible upconversion (…
A computational thermodynamic approach to determining the phase-chemical composition of films formed on the surface of metals and alloys under laser oxidation in the normal atmosphere, depending on their bulk composition, laser exposure conditions, and composition of the atmosphere, is suggested. It is demonstrated fo…
A major challenge with the use of quantum dots (QDs) for cellular imaging and biomolecular delivery is the attainment of QDs freely dispersed inside the cells. Conventional methods such as endocytosis, lipids based delivery and electroporation are associated with delivery of QDs in vesicles and/or as aggregates that a…
A metastable liquid crystal (LC) was found to serve as a time-responsive reaction medium, in which the enantioselectivity of a photoreaction was perfectly switched through isothermal annealing of the reaction system. When the LC salt of an enantiopure amine with a photoreactive acid was irradiated with UV/vis light, i…
To develop potent drugs for oral use, information on their pharmacokinetic (PK) properties after oral administration is of great importance. We have recently reported the utility of positron emission tomography (PET) for the analysis of gastrointestinal (GI) absorption of radiolabeled compounds. In this study, PET ima…
Measurement of mode I fracture toughness of in-plane random oriented short carbon fiber-dispersed SiC matrix composite fabricated by melt infiltration process has been carried out. Fracture toughness (KIc) measured using a Brazilian disk specimen is ~3.5−4.1MPam, which is comparable to those of monolithic engineering…
Hemp fibers-reinforced unsaturated polyester (UP) composites were prepared by hand lay-out compression molding. Hemp fibers were treated with isocyanatoethyl methacrylate (IEM), using dibutyltin dilaurate as a catalyst. The results indicated that fiber treatment significantly increased tensile strength, flexural stren…
The complex ( t Bu-SalAmEE)Al ( t Bu-SalAmEEH 3 = N, N -bis(3,5-di- tert -butyl-2-hydroxybenzyl)-2-(2-aminoethoxy)ethanol, 1 ) catalyzes the ring-expansion polymerization of lactide to form cyclic poly(lactide) (cPLA). The X-ray structure of 1 was determined, its polymerization kinetics were examined and its interacti…
We report, using molecular dynamics simulation studies, how and under what conditions graphene layers separate, fold and shear during a wedge-based mechanical exfoliation machining technique to produce few-layer graphene. Our previously reported experimental results using this novel technique have shown clear evidence…
Silicon carbide is a candidate cladding for fission power reactors that can potentially provide better accident tolerance than zirconium alloys. SiC has also been discussed as a host matrix for nuclear fuel. Chemical vapor–deposited silicon carbide specimens were exposed in 0.34–2.07 MPa steam at low gas velocity (~50…
Materials with the cubic ReO 3 -type structure are, in principle, excellent candidates for negative thermal expansion (NTE). However, many such materials, including TaO 2 F, do not display NTE. It is proposed that local distortions away from the ideal structure, associated with the need to accommodate the different bo…
ABSTRACT Nanostructured polymer composites (NPC) based on polyamide 6 (PA6) are prepared by activated anionic ring‐opening polymerization (AAROP) of mixtures of ε‐caprolactam (ECL) and organically treated montmorillonite (o‐MMT). The polymerization is performed in bulk, at 165°C, i.e., below the melting point of the r…
ABSTRACT Composites were investigated regarding the comparison of multi‐walled carbon nanotubes (MWCNTs) with exfoliated graphene(EG) in poly(L‐lactic acid) (PLLA) and the effect of silane‐treated carbon nanofillers on properties of PLLA composites. Solution blending method was used to prepare PLLA composites at a fil…
Carbon fiber reinforced composites are used in a wide range of applications in aerospace, mechanical, and civil structures. Due to the nature of material, most damage in composites, such as delaminations, are always barely visible to the naked eye, which makes it difficult to detect and repair. The investigation of bi…
A series of dibenzocoronene tetracarboxdiimide derivatives decorated with alkyl swallow-tail and alkoxy moieties were synthesized, and their structures were characterized. 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as an effective oxidant was first used in the benzannulation of perylene diimides with the almost q…
Abstract Thermal, mechanical and morphological properties of surface‐modified montmorillonite (OMMT)‐reinforced Viton rubber nanocomposites were studied. The surface of montmorillonite was modified with a column chromatography technique using quaternary long‐chain ammonium salt as an intercalant, which resulted in uni…
Carboxylation of carbon nanotubes (CNTs) is a byproduct of acid oxidation treatments that are applied routinely for several purposes including cleaning of CNTs and as a first step of functionalization procedures. In this study, we employ density functional calculations to study the atomic and electronic structures of…