Graphite-like nanocapsules tailored
- PDF / 296,798 Bytes
- 1 Pages / 585 x 783 pts Page_size
- 7 Downloads / 223 Views
eventually emerge at the sample surface where they influence the tip–surface coupling. An image of the subsurface structure is acquired by plotting the modified phase shift as the probe moves across the sample surface. The inner structure of different cells has been imaged with nanomechanical holography as has nanoparticles inside soft materials. According to the authors of the review article, “This new field provides a promising framework to improve compositional sensitivity and spatial and
to tune the size of the particles. As reported in the March 29 online edition of Nano Letters (DOI: 10.1021/ nl300822f), the researchers began by synthesizing the amphiphilic hexayne for use as reactive carbon precursors. In a pure state, the hexayne amphiphile was reactive and degraded at room temperature—but the researchers found that diluting the amphiphiles in dioxane/ MeOH created a solution that could be kept stable at 4°C for weeks. In aqueous solution, the hexayne amphiphiles experienced a reversible and non-reactive aggregation, resulting in vesicle-like lamellar shells encapsulating a core of
time resolution of materials in their native environment and, at the same time, allows properties that are not accessible to conventional force microscopes to be measured.” They said, “Multifrequency AFM methods are conceptually more demanding than conventional AFM methods, but this would seem to be a reasonable price to pay to sustain the impressive development of force microscopy that has been seen over the past 25 years.” Steven Trohalaki
water. Passage of the aqueous vesicle solutions through polycarbonate membranes with 50 nm or 100 nm pore sizes and subsequent UV radiation at 1°C esearchers in Holger Frauenrath’s resulted in transformation of the selfgroup at the Ecole Polytechnique assembled vesicles into carbon nanoFédérale de Lausanne (EPFL) have crecapsules. Small-angle x-ray scattering, ated carbon nanocapsules varying from transmission electron microscopy, and 50 nm to 100 nm in diameter through a dynamic light scattering experiments all wet-chemical, UV-assisted carburization confirmed they were hollow structures technique. R. Szilluweit, T.N. Hoheisel, with 4 nm wall thicknesses and radii of and colleagues at EPFL and the Swiss 34 nm or 54 nm. Federal Institute of Technology in Zürich Although they were prepared at fabricated these capsules from amphi1°C in water, the nanocapsules have an philic hexaynes using a low-temperature amorphous graphite carbon microstruccarbonization process that allowed them ture that can typically only be obtained by annealing at temperatures of above 600°C. The structure of the capsules a b c may allow them to be used in high-surface area lithium-ion battery electrodes, while their biofunctional shell of carbohydrates could enable exploitation in drug delivery and cancer detection. The salient discovery, however, has to be that of the process itself, which provides “a new universal strategy for the rational preparation of tailored, functional carbon nanostructures [that] may, hence,
Data Loading...
