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Li, Jing

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Author: Li, Jing × End date: 2002 ×

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Targeted degradation of RNA by RNase H using stable DNA hairpin oligomers and a study on the effect of temperature and divalent cations on RNA conformational states

2002-12 , Li, Jing

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Interparticle interactions in annealed FePt nanoparticle assemblies

2002-09 , Zeng, Hao , Li, Jing , Wang, Z. L. (Zhong Lin) , Liu, J. Ping , Sun, Shouheng

Thermal treatment of self-assembled FePt nanoparticles reduces the interparticle distances, resulting in dramatic changes in the type and strength of interparticle interactions. Consequently, magnetic properties such as the hysteresis and magnetization reversal mechanisms are strongly affected. It is suggested that controlled annealing of self-assembled nanoparticles may offer a novel approach for producing hard magnetic nanocomposites.

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Characterization of nanometer-scale defects in metallic glasses by quantitative high-resolution transmission electron microscopy

2002-03-25 , Li, Jing , Wang, Z. L. (Zhong Lin) , Hufnagel, T. C.

Although defects can have a significant effect on the properties of amorphous materials, in many cases these defects are poorly characterized and understood. This is at least partly due to the difficulty of imaging defects in amorphous materials in the electron microscope. In this work, we demonstrate the utility of quantitative analysis of high-resolution transmission electron microscopy for the identification and characterization of nanometer-scale defects in metallic glasses. For a proper identification of such defects, it is important to carefully consider the effects of the imaging conditions and thickness variations in the sample, both of which we describe in detail. As an example, we show that regions of localized plastic deformation (shear bands) in bulk metallic glasses contain a high concentration of nanometer-scale voids. These voids apparently result from the coalescence of excess free volume once the applied stress is removed.

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