Free-standing and single-crystalline Cu 3 Ge nanowires (NWs) were synthesized by a vapor-phase deposition method on the Cu foil. The NWs are grown along the [010] direction via a vapor-solid mechanism. The localized surface plasmon resonance of individual NWs on a Si substrate is investigated using the dark-field scattering spectroscopy. The resonance peak wavelength for NWs with different diameters is observed, which ranges from 500 to 550 nm. This study proves the existence and provides an insight for understanding the LSPR property of free-standing Cu 3 Ge NWs.
The double-encapsulated microcapsules were prepared by the non-solvent addition, phase-separation method to form core material and, encapsulated with the O/W emulsion non-solvent addition method to increase drug loading and regulate drug release rate. The drug used was theophylline, which is water-soluble. Dichloromethane and n-hexane were used as the solvent and non-solvent, respectively. This study investigated how various core material and microcapsule EC/TH ratios affect the drug loss, particle size, surface morphology and release rate. The drug loss of the double-encapsuLated microcapsules was 12.8% less than that of microcapsules prepared by the O/W emulsion non-solvent addition method alone. The particle size of these double-encapsulated microcapsules decreased as the concentration of EC polymer was increased in the second encapsulation process. The roughness of their surface was also in proportion to the concentration of polymer solution used in the second encapsulation process. The dissolution study showed that the T20 of the double-encapsulated microcapsules ranged from 2-35.4 h, while that of the O/W emulsion non-solvent addition method microcapsules was from 2.7-7.7 h. The greater the level of EC in the polymer solution, the slower the release rate of the drug from the microcapsules when the EC was not over the critical amount.
A cellulose triacetate (CTA) and three different molecular weights of poly(alpha-methyl styrene) (PMS) were used as co-wall materials to prepare composite microcapsules with ethylcellulose (EC). A non-solvent-addition phase-separation method was used. The core material was theophylline (TH) and the solvent-non-solvent pair was dichloromethane-n-hexane, and the drug-release rates of the microcapsules prepared from these two types of co-wall materials were compared. The effects of their phase-separation range on the properties of the microcapsules, such as particle size, release rate and the morphology of the microcapsules are also discussed. The release rate of microcapsules was also affected by the compatibility of the co-wall materials and the EC. The dissolution studies indicated that the drug-release time of CTA/EC and PMS/EC composite microcapsules was sustained to 10 and 3.5 times, respectively, in comparison with that for pure EC microcapsules.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.