Yahia L, Lombardi S, Selmani A, Drouin G, Hlaouti M
Biomechanics/Biomaterials Research Group, Institute of Biomedical Engineering, Ecole Polytechnique de Montréal, Qc, Canada.
Biomed Mater Eng. 1994;4(5):347-56.
The objective of this study was to determine the optimal experimental conditions for plasma treatment of polyester ligaments. Two different surface modification techniques were used: tetrafluoroethylene and methane. Gas flow rate, pressure, power, and treatment period giving a thin film with low friction coefficient and low surface energy was determined. Control and plasma treated surfaces were characterized by X-ray photoelectron spectroscopy to investigate the functionalization of the treated surfaces in detail. The surface tension of control and plasma treated surfaces were determined from contact angle measurements to understand the adhesion and reactivity of films with aqueous medium. The results showed a decrease in friction coefficient from 0.45 to 0.28 and from 0.45 to 0.26 for thin films deposited respectively by tetrafluoroethylene (TFE) and methane (CH4) plasma. Contact angles increased from 63 degrees to 120 degrees for TFE plasma and from 63 degrees to 93 degrees for CH4 plasma. Large contact angles mean a weak affinity between molecules in water/material phase, so that the power to attract cells to the surface of the material is too weak. The results showed that optimal film, i.e., low static friction coefficient and large contact angle, can be obtained by a CH4 plasma treatment at high power RF. For TFE plasma treatments, a low power RF is needed to obtain a thin film with a stable chemical structure.
本研究的目的是确定聚酯韧带等离子体处理的最佳实验条件。采用了两种不同的表面改性技术：四氟乙烯和甲烷。确定了能产生具有低摩擦系数和低表面能薄膜的气体流速、压力、功率和处理时间。通过X射线光电子能谱对未处理和经等离子体处理的表面进行表征，以详细研究处理后表面的功能化情况。通过接触角测量确定未处理和经等离子体处理表面的表面张力，以了解薄膜与水性介质的粘附性和反应性。结果表明，分别用四氟乙烯（TFE）和甲烷（CH4）等离子体沉积的薄膜，其摩擦系数从0.45分别降至0.28和0.26。TFE等离子体处理后的接触角从63度增加到120度，CH4等离子体处理后的接触角从63度增加到93度。大接触角意味着水/材料相中的分子间亲和力弱，因此将细胞吸引到材料表面的能力也弱。结果表明，通过高功率射频的CH4等离子体处理可获得最佳薄膜，即低静摩擦系数和大接触角。对于TFE等离子体处理，需要低功率射频来获得具有稳定化学结构的薄膜。
