AFM study of forces between silicon oil and hydrophobic–hydrophilic surfaces in aqueous solutions

Asymmetric Electrostatic and Hydrophobic–Hydrophilic Interaction Forces between Mica Surfaces and Silicone Polymer Thin Films

“…22 While polystyrene films were prepared by a similar graft-to procedure, 23,24 force measurements between the PS films and mica surfaces were not reported. Studies between liquid silicone films and mica surfaces have been done with AFM, 25,26 but the liquid film adds additional complexity due to hydrodynamic interactions. The siliconeÀmica system described here utilizes two inherently stable surfaces and allows for unambiguous insights into the interaction potential and specifically the separate electrostatic, hydrophobic, and steric contributions between silicone and mica surfaces.…”

Determination of Dead-Oil Wetting and Adhesive Forces on Carbonate Rocks Using Colloidal-Probe Atomic Force Microscopy

“…In the case of wet-oil probes as in Figure f, the force curves are independent of the solution concentration, and the repulsion is linearly correlated with the approach distance. This linearity is attributed to the compression of the oil layer on the silica microbead when pushed against the substrate . Hence, the thickness of the oil layer can be estimated from the linear region of the curve to be around 50 nm.…”

“…This linearity is attributed to the compression of the oil layer on the silica microbead when pushed against the substrate. 29 Hence, the thickness of the oil layer can be estimated from the linear region of the curve to be around 50 nm. In general, the dependency of force curves on solution concentration can be used as an indication for oil functionalization.…”

分散体系中液滴间力学行为

“…后有学者 通过在无尖探针上用硅胶黏连一个微米级大小的固 体小球并使之接近吸附在基底上的液滴, 从而实现 了固-液间作用力的测量 [10] . 更进一步的做法是在硅 球上涂上油膜再让其与固体界面或液滴接触从而测 量它们之间的作用力 [11] . 这种做法虽然巧妙、较前一 种做法更为先进, 然而需要指出的是, 硅球对于油膜 的受力和变形会产生很大的影响, 因此其所测量的 力与液-液间相互作用并不相同.…”

“…Dagastine等人 [20] 图 1 测量液滴示意图(a)和动态作用力-位移曲线(b) [21] Figure 1 (a) A schematic of oil droplets being measured; (b) the dynamic interaction force F vs. piezo motion ∆X between two droplets in aqueous solution [21] 通 Zbik和Frost [11] [24] Figure 2 Droplet interaction data obtained in the presence (a) and post-rinse (b) of sugar beet pectin (SBP) [24] 评 述 [32] . Balasuriya和 Dagastine [33] 在近期的研究中讨论了3种多肽表面活 性剂, Lac21, AM1和Lac21E对于气泡间相互作用的 [31] Figure 3 (Color online) Force curves between the two bubbles during approach-retract cycle (a) and approach-stop, approach protocol (b) [31] 由于其水膜排液速率远滞后于气泡的接近速率, 无 [12] Figure 4 Deflection vs. piezo extension curves of tiplesscantileversubstrate (dotted line), droplet-substrate (solid line) and droplet-droplet (dashed line) [12] 图 5 (网络版彩色)两液滴在不同距离时的相互作用及变形示意图 [24] Figure 5 (Color online) Interpretation of the interaction and deformation between oil droplets at different separation [24] 用力为零, 如5中所示.…”