Blending Borders and Sparking Change: Sidney Yip, Hybridity, and the Rise of Molecular Simulations in Cold War Materials Science

Between the mid-1970s and mid-1980s, molecular simulations emerged as a transformative force within materials science. Sidney Yip's early contributions at the Massachusetts Institute of Technology, alongside his involvement in the 1985 International School of Physics "Enrico Fermi" in Varenna, Italy, catalyzed the convergence of traditional methods with computational techniques and helped drive a redefinition of the discipline's epistemic and methodological boundaries. This article argues that Yip's biography and professional trajectory as a Chinese-born engineer and scientist in the United States during the Cold War facilitated the acceptance and advancement of molecular simulations within materials research. His work also attracted the interest of leaders from established fields, such as condensed matter physics and chemical physics, to explore the potential applications of these techniques in materials science. In examining his journey, this study illuminates the dual processes of cultural assimilation and hybridity, and highlights Yip's boundary work that promoted the integration of diverse epistemic traditions and heterogeneous communities. The analysis traces the epistemological transformations, methodological shifts, and the institutional and disciplinary dynamics that fostered the incorporation of molecular simulations into materials science. This examination foregrounds the co-construction of scientific knowledge and technological practice through Yip's boundary work, and offers an assessment of his contributions within the broader sociotechnical networks that shaped the field. Recognizing the paucity of existing historiography on the subject, this article aims to establish a framework based on primary sources that can serve as a foundation for future scholarly inquiry.