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RD Harris WS Baker Van Stipdonk MJ RM Crooks EA Schweikert 《Rapid communications in mass spectrometry : RCM》1999,13(14):1374-1380
A suite of keV polyatomic or 'cluster' projectiles was used to bombard unoxidized and oxidized self-assembled monolayer surfaces. Negative secondary ion yields, collected at the limit of single ion impacts, were measured and compared for both molecular and fragment ions. In contrast to targets that are orders of magnitude thicker than the penetration range of the primary ions, secondary ion yields from polyatomic projectile impacts on self-assembled monolayers show little to no enhancement when compared with monatomic projectiles at the same velocity. This unusual trend is most likely due to the structural arrangement and bonding characteristics of the monolayer molecules with the Au(111). Copyright 1999 John Wiley & Sons, Ltd. 相似文献
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Abstract Results of the quantum-chemical simulation of the formation of structural and radiation defects are reviewed, using ice, silicon, and silicon dioxide as examples. The relationship between the structural elements of these crystals and the structural defects is analysed. Models of the main defects, their optical characteristics, and the activation energy of their migration are discussed. The relationship between the characteristics obtained by quantum-chemical calculations and the parameters of the macroscopic kinetics of the processes induced by defects in dielectric crystals is considered. 相似文献
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A. A. Kotomin A. S. Kozlov S. A. Dushenok 《Russian Journal of Physical Chemistry B, Focus on Physics》2007,1(6):573-575
The detonatability of 3,4-dinitrofurazanfuroxan (DNTF) and 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (?-polymorph, CL-20) and mixtures thereof with polydimethylsiloxane rubber was studied. The dependences of the critical detonation diameter for the mixtures on the HE content and of pure DNTF and CL-20 on their specific surface area within 400–8000 cm2/g were examined. It was established that the detonatabilities of DNTF and CL-20 are close to those of PETN and HMX, respectively. 相似文献
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G. K. Shambilova V. E. Dreval’ S. V. Kotomin V. G. Kulichikhin 《Polymer Science Series A》2010,52(1):1-7
The rheological properties of 5% solutions of a fiber-forming polyamidobenzimidazole in DMAA containing LiCl additives and
polyamidobenzimidazole-polysulfone blends in the same solvent have been studied. The total concentration of polymer blends
with various component ratios is 5 wt %. At temperatures below ∼110°C, the systems under study behave as non-Newtonian fluids
and their viscosity decreases with temperature. At T > 110°C, the temperature dependence of viscosity passes through a minimum. The position of the minimum on the temperature
scale decreases with the concentration of polyamidobenzimidazole. This character of a change in viscosity is associated with
the phase separation of polyamidobenzimidazole solution that leads to its gelation. The temperature corresponding to the minimum
viscosity coincides with the onset temperature of a sharp turbidity of solution during heating. It is suggested that solutions
containing up to 5% polyamidobenzimidazole possess an LCST. The addition of up to 50% polysulfone has almost no effect on
the temperature of transition but brings about a marked decline in the viscosity of the system. 相似文献
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