硅衬底上肽膜的卡西米尔自由能：硅的介电-金属相变与肽中纳米颗粒的影响
The Casimir free energy of peptide films on a silicon substrate: Impact of dielectric-to-metal transition in silicon and nanoparticles in peptide
- Central Astronomical Observatory at Pulkovo of the Russian Academy of Sciences（俄罗斯科学院普尔科沃中央天文台）
- Peter the Great Saint Petersburg Polytechnic University（彼得大帝圣彼得堡理工大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
研究硅衬底的介电-金属相变及肽膜中纳米颗粒对卡西米尔自由能的影响，明确了肽膜厚度临界值的变化规律，为其在有机电子和生物医学的应用提供理论依据。
AI中文摘要：
利用范德瓦尔斯力和卡西米尔力的Lifshitz理论，我们计算了沉积在硅衬底上的薄肽膜的卡西米尔自由能。卡西米尔自由能被表示为膜厚度的函数，考虑了膜中不同的水含量、非磁性或磁性纳米颗粒的存在，以及硅衬底受激光脉冲照射或掺杂导致的介电-金属相变的影响。结果表明，对于介电性硅，存在一个膜厚度的临界值：当膜厚度大于该临界值时，卡西米尔自由能为负，有助于膜的稳定性；当膜厚度小于该临界值时，卡西米尔自由能为正，会降低膜的稳定性。根据我们的结果，肽膜厚度的临界值随膜中水的体积分数增加而减小，且这种减小在存在磁性纳米颗粒时更为显著，并随磁性纳米颗粒半径的增大而增强。我们还得到了肽膜厚度临界值与膜中水含量的函数关系。若硅衬底处于金属态，肽涂层的卡西米尔自由能始终为正，会降低其稳定性。我们还讨论了所得结果在有机电子学和生物医学中的潜在应用。
英文摘要：
Using the Lifshitz theory of the van der Waals and Casimir forces, we calculate the Casimir free energy of thin peptide films deposited on silicon substrates. The Casimir free energy is found as a function of film thickness for different fractions of water in the film, in the presence of either nonmagnetic or magnetic nanoparticles, and under the impact of irradiation of a silicon substrate with laser pulses or dopants resulting in the dielectric-to-metal phase transition. It is shown that for a dielectric silicon there is the borderline value of the film thickness, such that the Casimir free energy is negative and contributes to the film stability for thicker films, but is positive and makes the film less stable for thinner ones. According to our results, the borderline value of peptide film thickness decreases with increasing volume fractions of water and in the film. This decrease is more pronounced for the magnetic nanoparticles and becomes stronger with increasing their radius. The borderline value of peptide film thickness is found as a function of the fraction of water in the film. If the silicon substrate is in metallic state, the Casimir free energy of peptide coating is always positive, which makes it less stable. Possible applications of the obtained results in organic electronics and biomedicine are discussed.
