在非极性溶剂中,Langmuir-Blodgett聚合物层之间的表面力和摩擦
Nicholas M Taylor1, Georgia A Pilkington1, Tim Snow1
1School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
Journal of colloid and interface science
|October 7, 2023
概括
研究人员通过Langmuir-Blodgett (LB) 薄膜使用功能化烯共聚合物 (FOCP) 优化了边界滑. 调膜结构控制了摩擦,实现了超滑性,并展示了强大的边界层,以提高能源效率.
科学领域:
- 三角学和滑科学 三角学和滑科学
- 材料科学与工程 材料科学与工程
- 表面的化学和物理.
背景情况:
- 边界滑对于机械系统的能效至关重要.
- 表面活性添加剂,如聚合物和表面活性剂,是优化滑的关键.
- 控制局限分子结构对于调整滑性能至关重要.
研究的目的:
- 为了研究功能化烯酸共聚合物 (FOCP) 薄膜的三元学性质.
- 探索Langmuir-Blodgett (LB) 沉积过程中侧面封闭对薄膜结构和摩擦的影响.
- 为设计先进的滑边界层建立结构-属性关系.
主要方法:
- 使用兰迈尔-布洛杰特 (LB) 技术在上制造FOCP薄膜.
- 使用表面力装置 (SFA) 直接测量正常和剪力.
- 使用同步X射线反射率 (XRR) 描述薄膜厚度和结构.
主要成果:
- 薄膜厚度随着表面压力 (Πdep) 的增加而增加,这表明多层形成.
- 摩擦系数 (μ) 在两个数量级上有所变化,从超度 (μ ≈ 0.002) 到高摩擦 (μ > 0.1).
- 最低的摩擦被观察到中间的 Πdep,归因于在接口上的功能组排列.
结论:
- 由LB压缩控制的FOCP的分子架构决定了滑性能.
- 膜具有结构稳固性和强大的表面固性,作为有效的边界层.
- 定制宏分子结构为 tribological 应用中高效的能量消耗提供了新的策略.
相关概念视频
03:37Molecular Shape and Polarity
60.5K
Dipole Moment of a Molecule
60.5K
03:00Solubility
17.5K
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
17.5K
02:34Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
44.5K
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
44.5K
02:56Intermolecular Forces and Physical Properties
20.8K
20.8K
02:57Surface Tension, Capillary Action, and Viscosity
28.0K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
28.0K
02:28Intermolecular Forces in Solutions
33.9K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
33.9K