Quality assured surface pre-treatment may greatly enhance adhesive interactions and, thus, the performance and durability of material joints. This holds true as well for substrates used in coating processes as for adherents introduced into bonding processes. Wettable polymeric wetting agents—shortly called polymeric interfactants—contribute to modifying surfaces and governing the properties of interphases. This is demonstrated for amphiphilic polymers directing the adsorption of graphene oxide (GO) nano-sheets from aqueous dispersion on alumina surfaces. In this contribution, contact angle measurements as well as X-ray photoelectron spectroscopy and scanning force microscopy investigations are applied for the characterization of thin films. GO is adsorbed either from a buffered dispersion on pristine aluminum oxide surfaces or on alumina modified with a few nanometers thin layer of a polymeric interfactant. Laterally extended nanoparticles and GO nano-sheets are preferentially found on interfactant layers whereas on pristine aluminum oxide smaller adsorbates dominate. The driving forces directing the GO attachment are discussed using a phenomenological model based on polymer/substrate interactions governing the sticking probabilities of GO nano-sheets with different sizes.

中文翻译：

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两亲性聚合物对在蓝宝石衬底上指导氧化石墨烯层形成的界面作用

有质量保证的表面预处理可以大大增强胶粘剂的相互作用，从而提高材料接头的性能和耐用性。这对于涂覆工艺中使用的基材以及引入到粘合工艺中的粘合剂同样适用。可湿润的聚合物湿润剂（简称为聚合物界面活性剂）有助于改性表面和控制相间性能。对于两亲性聚合物，这可指导其从水分散体在氧化铝表面上吸附氧化石墨烯（GO）纳米片。在这一贡献中，接触角测量以及X射线光电子能谱和扫描力显微镜研究被用于薄膜的表征。GO可以从缓冲分散液中吸附到原始的氧化铝表面上，也可以被几纳米薄的聚合物界面剂改性的氧化铝上吸附。横向延伸的纳米颗粒和GO纳米片优先发现在界面活性剂层上，而在原始氧化铝上，较小的吸附物占主导地位。使用基于聚合物/底物相互作用的现象学模型讨论了指导GO附着的驱动力，该聚合物/底物相互作用决定了具有不同尺寸的GO纳米片的粘附概率。