本文關鍵詞：從確定性到隨機性的黏附接觸理論　出處：《科學通報》2016年07期 　論文類型：期刊論文

  更多相關文章： 黏附 接觸力學 納米顆粒 熱漲落 隨機脫黏

【摘要】：膠體、藥物輸運、細胞-病毒等體系中廣泛涉及納米顆粒與彈性固體表面之間的黏附相互作用.本文簡要回顧了黏附接觸理論的發(fā)展歷史:已有的確定性黏附接觸理論(如JKR,DMT等模型)預測,顆粒在低于臨界分離拉力的作用下不會與基底分離,這一結論在顆粒特征尺寸減小到納米尺度時不再適用.研究表明:當納米顆粒與固體表面黏附的能量尺度接近環(huán)境熱噪聲的特征能量時,其界面黏附呈現(xiàn)出顯著的尺寸效應和由此導致的隨機性.基于經(jīng)典的Kramers理論,建立了統(tǒng)計的黏附接觸理論,將納米顆粒與固體表面的黏附狀態(tài)演化視為廣義擴散過程,并用黏附壽命的概率分布描述黏附界面的相對強弱.兩個納米顆粒同時與彈性固體表面作用時,二者的黏附狀態(tài)呈現(xiàn)明顯的時空關聯(lián),可通過改變其中一顆粒的狀態(tài),間接調控另一顆粒的黏附壽命.
[Abstract]:Colloid, drug delivery. The adhesion interaction between nanoparticles and elastic solid surfaces is widely involved in cell-virus systems. The history of adhesion contact theory is briefly reviewed in this paper. Like JKR. DMT et al.) it is predicted that particles will not be separated from the substrate under the action of lower critical separation tension. This conclusion is no longer applicable when the particle characteristic size is reduced to nanometer scale. The results show that when the energy scale of the adhesion between nanoparticles and solid surface is close to the characteristic energy of ambient thermal noise. The interfacial adhesion shows significant size effect and randomness. Based on the classical Kramers theory, the statistical adhesion contact theory is established. The adhesion state evolution between nanoparticles and solid surfaces is regarded as a generalized diffusion process, and the relative strength of the adhesion interface is described by the probability distribution of the adhesion life. When the two nanoparticles interact with the elastic solid surface at the same time. The adhesion state of the two particles is spatially and temporally related, and the adhesion life of the other particle can be indirectly regulated by changing the state of one of the particles.
【作者單位】： 浙江大學航空航天學院應用力學研究所;香港大學機械工程系;
【基金】：國家自然科學基金(11202184,11321202)資助
【分類號】：O343.3
【正文快照】： 1黏附接觸理論發(fā)展歷史接觸力學的起源可以追溯到1882年,Hertz[1]在研究通過機械力改變材料光學性質的過程中,發(fā)現(xiàn)玻璃球與棱鏡的接觸區(qū)域出現(xiàn)了橢圓形的牛頓環(huán),由此推斷并驗證了玻璃球對棱鏡的壓力分布為橢圓型分布.在經(jīng)典彈性力學體系下,Hertz接觸模型可解析的應用于球體與，

本文編號：1358995