Materials Literature
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The copper-ion-exchanged ZSM-5 type zeolite, prepared by ion-exchange in an aqueous solution of Cu(CH3COO)2 and evacuation at 873 K, gives a distinctive IR band at 2151 cm−1 due to the adsorbed CO species. More efficient adsorption of N2 was exhibited by this sample, compared with samples prepared by other methods, im…
The objective of this study was to investigate the pharmacokinetics and in vivo anti-tumor effect of recombinant human tumor necrosis factor-alpha (rHuTNF-alpha) encapsulated in poly(methoxypolyethyleneglycol cyanoacrylate-co-n-hexadecyl cyanoacrylate) (PEG-PHDCA) nanoparticles. Our experimental results showed that PE…
The effects of the specimen temperature of low-density polyethylene (LDPE) in O2 plasma treatment were studied to enhance the amount of hydrophilic functional groups introduced and to reduce the aging effect. The specimen temperature was varied from 25°C to 100°C. The smallest water contact angle was obtained with the…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTA Study of the Physical Aging in Semicrystalline Poly(ethylene terephthalate) via Differential Scanning CalorimetryJ. Zhao, R. Song, Z. Zhang, X. Linghu, Z. Zheng, and Q. FanView Author Information State Key Laboratory of Polymer Physic…
The photophysical properties of (i) three macrocycles (1–3) of different size, each one incorporating a bis(2,5-dimethylpyrrolo[3,4-d])tetrathiafulvalene (TTFP) and a 1,4-dimethoxybenzene (DMB) electron-donating unit, (ii) the six pseudorotaxanes obtained by threading 1–3 with the electron acceptors dimethyldiazapyren…
The new complexes of formulae PPh4[Cr(dpa)(ox)2] (1), AsPh4[Cr(dpa)(ox)2] (2), Hdpa[Cr(dpa)(ox)2]·4H2O (3), Rad[Cr(dpa)(ox)2]·H2O (4) and Sr[Cr(dpa)(ox)2]2·8H2O (5) [PPh4 = tetraphenylphosphonium cation; AsPh4 = tetraphenylarsonium cation; dpa = 2,2′-dipyridylamine; ox = oxalate dianion; Rad = 2-(4-N-methylpyridinium)…
Fibrous capsule formation around implants can inhibit solute exchange between implantable devices and the circulation. Parylene-n coated polycarbonate disks surrounded with growth factor reduced Matrigel (MG) or several gelatin-based matrices were implanted intramuscularly into rats for 21 or 50 days. MG supplemented…
The new narrow-rim functionalised receptor 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis[2-(diethylcarbamoylmethoxy)ethoxy]calix[4]arene (A4bL4) has been synthesised. NMR spectra show it to adopt a cone conformation in solution with a time-averaged C4v symmetry. A4bL4 reacts with trivalent lanthanide ions in aceton…
Methacrylated hyperbranched poly(amine ester)s as oligomers in radiation curing resins have a lower viscosity and a higher cure speed. Their viscosity was reduced sharply when an amount of a monomer was added or the temperature was increased. Their polymerization rate and final conversion of the double bond differ wit…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMedium-Dependent Self-Assembly of an Amphiphilic Peptide: Direct Observation of Peptide Phase Domains at the Air−Water InterfaceEvan T. Powers and Jeffery W. KellyView Author Information Department of Chemistry and the Skaggs Institute of Chemical Biology, The Scripps…
Two types of macrocyclic multi-telluranes with hypervalent Te–O apical linkages in the main chain were prepared by the reaction of a telluronium salt or a cationic ditelluroxane with phthalate via [3 + 3] and [2 + 2] assembly, respectively.
Porous silicon is a network of parallel straight mesopores without lateral interconnection. The adsorption isotherm of nitrogen onto porous silicon exhibits a hysteresis loop of type H2 in the IUPAC classification, similar to those observed for highly interconnected mesoporous media. This shows that it is not possible…
Two series of bis[1,2-bis(4-n-alkylphenyl)ethane-1,2-dithiolene]nickel, Cn–Ni (n = 1–12), and bis[1,2-bis(4-n-alkoxyphenyl)ethane-1,2-dithiolene]nickel, CnO–Ni(n = 1–12, 14, 16, 18), have been synthesized. Their mesomorphism, thermochromism, supramolecular structures and π-acceptor property have been investigated by u…
We argue that elastic interactions between ions in different valence states can play an essential role in the stabilization of stripes (or 2D "sheets" ) in doped oxides. These interactions are in general long range and an iso tro pic (attractive in certain directions and repulsive in others). This can naturally give r…
SUMMARYChanges of the surface state during the pretreatment of electroless nickel plating on magnesium alloys were studied using the weight loss method. scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that due to the formation of Mg(OH), and MgF,films on the surface. a…
The combination of boronic acid-appended poly(L-lysine) 1 and sugar-based gelator 2 yields a novel organo-polymer gel, consisting of vesicles held together by polymer molecules.
Rapid, exothermic metathesis (exchange) reactions between ZrCl4 and Na2O result in crystalline ZrO2 in seconds. Thermal analysis and in situ reaction temperature measurements show that the reaction initiates near the sublimation point of ZrCl4, rapidly reaches temperatures above 1350 °C, and generates a molten NaCl fl…
A series of nanocrystalline diamond films with grain size ranged from 4 nm to a few hundreds of nanometers were grown by microwave plasma enhanced chemical vapor deposition. Effects of the substrate pretreatment and the methane fraction in the source gas on the microstructure, surface roughness, and optical transmitta…
Plasma lithography, combining plasma deposition with photolithography, is described as a versatile method to manufacture all-polymeric substrates with thin-film patterns for applications in biomedical engineering. Patterns of a hydrophobic fluorocarbon plasma polymer with feature sizes between 5 and 100 microm were de…
Extrusion foaming of molten polystyrene (PS) with three physical foaming agents (PFAs), carbon dioxide (CO2), 1,1,1,2-tetrafluoroethane, and 1-chloro-1,1-difluoroethane, is considered. The concentration of injected PFA was W = 0–5 wt % for CO2 and W = 0–15 wt % for the other agents. The aim of this work is to connect…