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Alkyl-capped silicon nanocrystals can be dispersed in aqueous media by shaking or stirring their solutions in organic solvents (DMSO, ether, THF) with excess water. THF is the most straightforward choice with which to prepare stable aqueous dispersions, because the nanocrystals are very soluble in THF and it is also miscible with water. As little as 0.01%(More)
Resonant inelastic x-ray scattering (RIXS), x-ray absorption spectroscopy and x-ray excited optical luminescence (XEOL) have been used to measure element specific filled and empty electronic states over the Si L(2,3) edge of passivated Si nanocrystals of narrow size distribution (diameter 2.2 ± 0.4 nm). These techniques have been employed to directly(More)
In this study, polyethylene glycol (PEG) and vinyltriethoxysilane (VTES) were used in different proportions to produce a series of PEG–VTES copolymers. The copolymer molecular structures were confirmed by FTIR spectroscopy. In addition, their surface activities were evaluated by evaluating the surface tension, contact angle, and foaming properties. The(More)
Aquarius is an L-band microwave instrument to make precise sea surface salinity measurements from space. The objective is to study interactions between the ocean circulation, water cycle and climate by monitoring large scale seasonal and interannual salinity variations in the open ocean. Aquarius combines an ultra-stable radiometer as the primary instrument(More)
Contemporaneous measurements of the time dependence of photoluminescence and concomitant electrical conduction in films of alkylated silicon nanocrystals (NCs) during and between periods of continuous-wave laser irradiation of arbitrary duration establish the role played by photoionization to a conducting state in the intermittent light emission from(More)
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