Microbubbles have attracted widespread attention within the academic community, owing to their great potential for applications in microsystems. Considering practical applications, it is critical to use a simple method to generate a controllable microbubble without contaminating the target environment. In this paper, we propose a convenient and controllable method to generate a vapor microbubble using a monolayer graphene-assisted microfiber (GMF). When the light beam at a wavelength of 1.55 μm is coupled to GMF immersed in liquid, light energy can be converted into heat energy due to the photothermal effect of graphene, and thus a stable and controllable microbubble can be generated due to the existence of a temperature gradient around the GMF. This microbubble is used to capture microsphere particles such as polystyrene particles by means of the Marangoni Convection around it. Compared with bare microfiber, GMF has a higher fabrication tolerance for the purposes of generating microbubbles, and a lower threshold optical power due to the strong photothermal effect of graphene. Our proposed device, which demonstrates advantages such as ease of manufacture, simple structure, and biocompatibility, is a promising candidate for future applications in the fields of directional transport of drugs, biomedicine, biochemistry, microfluidics, etc.

中文翻译：

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用于微粒操作的石墨烯光热效应诱导的微泡

微气泡因其在微系统中的巨大应用潜力而在学术界引起了广泛关注。考虑到实际应用，使用简单的方法产生可控的微气泡而不污染目标环境至关重要。在本文中，我们提出了一种使用单层石墨烯辅助微纤维 (GMF) 生成蒸汽微泡的方便且可控的方法。当波长为 1.55 μm 的光束耦合到浸没在液体中的 GMF 时，由于石墨烯的光热效应，光能可以转化为热能，从而由于石墨烯的存在而产生稳定可控的微泡。 GMF 周围的温度梯度。该微泡用于通过其周围的马兰戈尼对流来捕获微球颗粒，例如聚苯乙烯颗粒。与裸微纤维相比，GMF 在产生微气泡方面具有更高的制造公差，并且由于石墨烯的强光热效应具有更低的阈值光功率。我们提出的装置具有制造容易、结构简单和生物相容性等优点，是未来在药物定向运输、生物医学、生物化学、微流体等领域应用的有希望的候选者。