Ionics - Manganese oxide nanoflakes incorporated functionalized multi-walled carbon nanotubes (f-MWCNTs/MnO2 NFs) have been prepared through a simple chemical method. The morphology and structure... 相似文献
A simple approach to improve the structural ordering in block copolymer/nanoparticle nanocomposites is presented. It is to blend a small molecular weight homopolymer with the composites, which can uniformly swell the preferred domain where the nanoparticles locate and increase the conformational entropy of the domain. Consequently, the interfaces between the block copolymer domains become smooth that improves the long range order in the nanocomposites. Furthermore, the uniform swelling of the preferred domain by the homopolymer will allow higher loading of nanoparticles without adversely affecting the long range order.
Summary: Nanowire lengths and length‐to‐width aspect ratios in regioregular poly(3‐hexylthiophene) (P3HT) were simply controlled through changes in the solvent vapor pressure during solidification. It is demonstrated that the nanowires grew by rod‐to‐rod association, in which the molecular long axis of the P3HT chains appeared to be well‐oriented parallel to the silicon substrate (Si/SiOx). The formation of the nanowires took place by one dimensional self‐assembly, governed by π‐π stacking of the P3HT units.
TEM high contrast images showing P3HT nanowires fabricated by spin‐coating under a solvent vapor pressure. 相似文献
Trace quantities of laser ablated organic polymers were analyzed by using commercial capillary column gas chromatography/mass spectrometry; the instrument was modified so that the iaser ablation products could be introduced into the capillary column directly and the constituents of each peak in the chromatogram were identified by using a mass spectrometer. The present study takes advantage of the selective ion monitoring mode for significantly improving the sensitivity of the mass spectrometer as a detector, which is critical in anatyzing the trace quantities and confirming the presence or absence of the species of interest in laser ablated polymers. The initial composition of the laser ablated polymers was obtained by using an electron impact reflectron time-of-flight mass spectrometer and the possible structure of the fragments observed in the spectra was proposed based on the structure of the polymers. 相似文献
catena‐Poly[dicyclohexylammonium [tributyltin‐μ‐(4‐oxo‐4H‐pyran‐2,6‐dicarboxylato‐O2:O6)]], (C12H24N)[Sn(C7H2O6)(C4H9)3], consists of 4‐oxo‐4H‐pyran‐2,6‐dicarboxylato groups that axially link adjacent tributyltin units into a linear polyanionic chain. The ammonium counter‐ions surround the chain, and each cation forms a pair of hydrogen bonds to the double‐bond carbonyl O atoms of the same dianionic group. The chain propagates in a zigzag manner along the c axis of the monoclinic cell. In catena‐poly[methyl(phenyl)ammonium [tributyltin‐μ‐(pyridine‐2,6‐dicarboxylato‐O2:O6)]], (C7H10N)[Sn(C7H3NO4)(C4H9)3], the pyridine‐2,6‐dicarboxylato groups also link the tributyltin groups into a chain, but the hydrogen‐bonded chain propagates linearly on the ac face of the monoclinic cell. 相似文献
The monoclinic cell of dicyclohexylammonium 2,4‐dichlorophenoxyacetate contains four C12H24N+·C5H8Cl2O3? ion pairs. The ammonium N atom is hydrogen bonded to the oxygen ends of two carboxyl groups to form a 12‐membered O—C—O?HNH?O—C—O?HNH ring. In (2,4‐dichlorophenoxylacetato)bis(triphenylphosphine)silver(I), [Ag(C8H5Cl2O3)(C18H15P)2], the carboxyl CO2 unit chelates to the Ag atom in an anisobidentate manner [Ag—O = 2.436 (2) and 2.517 (2) Å]; the Ag atom shows distorted tetrahedral geometry. 相似文献