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High-density liquid-crystalline azobenzene polymer brush attained by surface-initiated ring-opening metathesis polymerization.
High-density polynorbornene azobenzene liquid-crystalline brushes are synthesized on quartz substrates by surface-initiated ring-opening metathesis polymerization (SI-ROMP) using Grubbs third-generation catalyst. The grafting process is controlled over the thickness of the brush from a solid-support...
Self-destructing "mothership" capsules for timed release of encapsulated contents.
We describe a new class of hierarchical containers that are formed via single-step assembly and, at a later time, self-destruct because of their packaged contents. These containers are spherical capsules formed by electrostatic complexation of the anionic biopolymer, gellan gum, with the cationic bi...
Manipulation of Interfacial Amine Density in Epoxy-Amine Systems as Studied by Near-Edge X-ray Absorption Fine Structure (NEXAFS).
We investigate the ability to tune the quantity of surface amine functional groups in the interfacial region of epoxy-diamine composites using NEXAFS, a technique that is extremely sensitive to surface composition. Thereby, we employ a model surface (silicon wafer with the native oxide present) and,...
Sweating liquid micro-marbles: dropwise condensation on hydrophobic nanoparticulate materials.
We present a remarkably simple process driven by condensation on a nanoparticulate matrix to continuously produce liquid marbles whose mean size can be controlled in the range of diameters from 3μm to 1000μm, while the distribution width is also controllable independently. We experimentally demons...
Base-stacking-determined fluorescence emission of DNA abasic site-templated silver nanoclusters.
We find that fluorescent Ag NCs can be size-selectively grown at DNA abasic sites (AP site) using a constrained duplex environment opposed by a cytosine and flanked by two guanines. The size of the AP site-grown Ag NC is not affected by increasing Ag+ concentration. A Job's plot analysis shows that...
Two types of two-component gels formed from pseudoenantiomeric ethynylhelicene oligomers.
I gels). The combinations (M)-6/(P)-3, (M)-7/(P)-3, and (M)-8/(P)-3, which contained oligomers with considerably different numbers of helicenes, formed turbid gels (Type II gels). Negative Cotton effects were observed for the Type I gels in the region between 350 and 450 nm, and were positive for th...
Paradox of stability of nanoparticles at very low ionic strength.
The scaling of electrical double layer interaction energy from a plate-plate system to a sphere-plate system was reexamined, and it was found that accurate scaling without resorting to the Derjaguin approximation theoretically predicts the destabilization of nanoparticles in water de...
Aqueous phase synthesis of palladium tripod nanostructures for Sonogashira coupling reactions.
In this work, palladium tripod nanocrystals have been synthesized by mixing an aqueous solution of cetyltrimethylammonium bromide (CTAB) surfactant, Na(2)PdCl(4), copper acetate, and ascorbic acid at 30 °C for 3 h. Addition of a small amount of copper ion source is critical to the f...
Spontaneous grafting of diazonium salts: chemical mechanism on metallic surfaces.
We present a fine spectroscopic analysis of the coatings obtained on gold and nickel substrates that allow proposing a chemical structure of such films, in particular their interface with the substrates. After testing the most probable mechanisms, we have concluded in favor of the involvement of two...
Transient colloidal stability controls the particle formation of SBA-15.
We argue that the interface between the flocs and surrounding media is covered by Pluronic-molecules, which provide steric stabilization. As the flocs grow the coverage of polymers at the interface is increased until a stable size is reached, and that regulates the particle size. By targeting the ch...