On IVF Approximating Spaces

We introduce the concept of IVF approximating spaces and obtain decision conditions that every IVF topological space is an IVF approximating space

2,2′-Bis(prop-2-yn­yloxy)-1,1′-binaphth­yl

In the title compound, C26H18O2, the mol­ecule is located on a twofold rotation axis. The two naphthyl ring planes in the mol­ecule are nearly perpendicular to each other [dihedral angle = 82.42 (1)°. No classical hydrogen bonds or aromatic π–π stacking inter­actions were observed

Aqua(3-formyl-2-oxidobenzoato-κ2O1,O2)(1,10-phenanthroline-κ2N,N′)copper(II) methanol solvate

In the structure of the title complex, [Cu(C8H4O4)(C12H8N2)(H2O)]·CH4O, the CuII ion is pentacoordinated in a tetragonal–pyramidal geometry, with two O atoms of the 3-formyl-2-oxidobenzoate (3-formylsalicylate) anion and two N atoms of 1,10-phenanthroline occupying the basal plane, and a water O atom located at the apical site. The structure displays O—H...O hydrogen bonding

Grafting of graphene oxide with stimuli-responsive polymers by using ATRP for drug release

A thermo-responsive drug delivery system was reported based on grafting of stimuli-responsive poly(N-isopropylacrylamide) (PNIPA) on the surface of graphene oxide (GO) via atom transfer radical polymerization. The successful synthesis of PNIPA attached on GO (GO-PNIPA) was confirmed by X-ray photoelectron spectrum, X-ray diffraction, atomic force microscope, field-emission scanning electron microscopy, and transmission electron microscopy measurements. Control of drug release through the composite GO-PNIPA was performed by measuring the uptake and release of ibuprofen (IBU). It was found the delivery system demonstrated a much high IBU storage of 280 wt%, attributing to the formation of the hydrogen bonding between the polymers on the GO surface and IBU as well as the large number of internal cavities of the PNIPA chains. In vitro test of IBU release exhibited a narrow pronounced transition at around 22 degrees C, indicating an attractive thermo-sensitive release property of this delivery system. The strategy may pave the way for the use of GO in numerous applications, from drug delivery to thermally responsive micro- and nano-devices

Microstructure and Photocatalytic Activity of the Anti-Virus CaWO4:Eu3+ Nanoparticles

CaWO4:Eu3+ anti-virus nanoparticles have been successfully prepared by a modified sol-gel method. Characteristics of nano-structure were measured by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Experimental results show that Rhodamine B and methyl orange could be degraded effectively by Scheelite nanoparticles (40-50 nm) and the photocatalytic decomposition was characterized by UV-visible absorption spectra. Inhibitory actions against herpes simplex virus (HSV) reflected the anti-virus behavior tungstenic nanoparticles. Owing to the nano-traps shown in high resolution transmission electron microscopy (HRTEM), microstructure of tungstate on the surface that looks like bunches of grapes, which make the nanoparticles absorbed by organic dyestuff and virus, due to the high active hydroxyl free radicals on surface of nanoparticles and electrons complement from semiconductor photoelectric behavior. This micro-battery analysis explains photocatalytic activity and anti-virus behavior, and displays the relationship between them, which gives support to prove the oxidation and deoxidization circulation theory of Yamase