排序方式: 共有8条查询结果,搜索用时 15 毫秒
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Tiffany Abitbol Heera S. Marway Stephanie A. Kedzior Xuan Yang Anne Franey Derek G. Gray Emily D. Cranston 《Cellulose (London, England)》2017,24(3):1287-1293
Carboxylated cellulose nanocrystals (CNCs) were decorated with CdSe/ZnS quantum dots (QDs) using a carbodiimide chemistry coupling approach. The one-step covalent modification was supported by nanoscale imaging, which showed QDs clustered on and around the CNCs after coupling. The QD–CNC hybrid nanoparticles remained colloidally stable in aqueous suspension and were fluorescent, exhibiting the broad excitation and narrow emission profile characteristic of the QDs. QD–CNCs in nanocomposite films imparted strong fluorescence within CNC-compatible matrices at relatively low loadings (0.15 nmol QDs/g of dry film), without altering the overall physical properties or self-assembly of the CNCs. The hybrid QD–CNCs may find applications in nanoparticle tracking, bio-imaging, optical/sensing devices, and anti-counterfeit technologies. 相似文献
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It is shown that the interference of potential scattering and elastic transfer amplitudes can account for the recently observed gross structure in the excitation function for elastic scattering of 16O by 28Si at 180°. 相似文献
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Amanda M. Franey Nina D. Serratore Noah A. Setterholm Scott K. Bur 《Tetrahedron letters》2012,53(2):179-181
Increasing the size of the silyl group on 2-trialkylsilyloxyfurans reduces the rate of Diels–Alder reactions with maleic acid derivatives. While the exo-adduct resulted from the reaction between 2-silyloxyfurans and maleic anhydride, endo-adducts resulted from the reactions with maleate esters. Analysis of transition state structures for the cycloaddition, calculated at the B3LYP/6-31G1 level of theory, revealed significant stretch-mode asynchronicity in the forming bonds, with selectivity arising from steric interactions that affect torsional strain about the shorter of the forming bonds. 相似文献
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Single-neutron transfers induced by 12, 13C and 16, 17, 18O projectiles on 208Pb and the 12C(17O, 16O)13C reaction have been studied at energies close to the Coulomb barrier. These processes are well described by the distorted-wave Born approximation. Coupled-channels effects are found to be small. Normalization factors have been determined for all projectile and target transitions, and also for the triton-deuteron overlap by comparison with previous measurements of the 208Pb(d, t)207Pb reaction. The root-mean-square (rms) radii of single-particle neutron wave functions in 208Pb and 209Pb were calculated using known spectroscopic factors. The distribution of the point neutron excess density in the surface region of 208Pb has been derived and its rms radius determined to be 5.93 ± 0.13 fm with a local potential model. This is in good agreement with theoretical predictions, but is considerably larger than estimates based on Coulomb energy differences. The phenomena of core polarisation by the odd particle or hole outside 208Pb is discussed using the single-particle orbitals determined in this work. 相似文献
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