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Here, we investigate fluid transport in confined microfluidic cavities to establish design principles for efficient transparency switching to a desired level, effectively serving as a built-in curtain. By systematically varying cavity thickness (0\u2013300 \u00b5m) and liquid viscosity (1\u201320 mPa\u00b7s), we show that reducing the cavity gap to 100 \u03bcm and employing a low-viscosity refractive index matching liquid (RIML), such as methyl benzoate, enables stable liquid curtain formation while reducing liquid consumption. Low-viscosity RIMLs also promote more effective drainage, resulting in enhanced opacity (T = 16.26 \u00b1 0.20%) in the drained state. Dynamic display patterns were achieved, enabling switchable decorative and functional features within the smart-glass assembly. Furthermore, beam-engineering-based theoretical calculations, validated experimentally, were used to determine the maximum viable dimensions of large-area glass panels. These findings provide practical guidelines for the development of compact, energy-efficient, and scalable MTSG systems.<\/jats:p>","DOI":"10.1021\/acsami.6c15001","type":"journal-article","created":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T08:01:55Z","timestamp":1791792115000},"page":"56859-56869","source":"Crossref","is-referenced-by-count":0,"title":["Confined Liquid Transport Engineering for Compact and High-Performance Microfluidic Transparency-Switching Glass"],"prefix":"10.1021","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-8429-4752","authenticated-orcid":true,"given":"Rahul","family":"Muthukumaran","sequence":"first","affiliation":[{"name":"Centre for Nano and Soft Matter Sciences, Arkavathi Campus , ,","place":["Bengaluru, India, 562162"]},{"name":"Manipal Academy of Higher Education , ,","place":["Manipal, India, 576104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Srinivas Prasad","family":"Bengaluru Subramanyam","sequence":"additional","affiliation":[{"name":"Saint-Gobain Research India , IIT Madras Research Park, Taramani , , ,","place":["Chennai, Tamilnadu, India, 600113"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Srinivas","family":"Doddi","sequence":"additional","affiliation":[{"name":"Saint-Gobain Research India , IIT Madras Research Park, Taramani , , ,","place":["Chennai, Tamilnadu, India, 600113"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0832-5582","authenticated-orcid":true,"given":"Ashutosh K.","family":"Singh","sequence":"additional","affiliation":[{"name":"Centre for Nano and Soft Matter Sciences, Arkavathi Campus , ,","place":["Bengaluru, India, 562162"]},{"name":"Manipal Academy of Higher Education , ,","place":["Manipal, India, 576104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4317-1307","authenticated-orcid":true,"given":"Giridhar U.","family":"Kulkarni","sequence":"additional","affiliation":[{"name":"Centre for Nano and Soft Matter Sciences, Arkavathi Campus , ,","place":["Bengaluru, India, 562162"]},{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research, Arkavathi Campus , , , ,","place":["Bengaluru, Karnataka, India, 560064"]},{"name":"Manipal Academy of Higher Education , ,","place":["Manipal, India, 576104"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,12]]},"reference":[{"issue":"8","key":"2026102108071438300_cit1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202415921","article-title":"Achieving Broadband Microwave Shielding, Thermal Management, and Smart Window in Energy-Efficient Buildings","volume":"35","author":"Tan","year":"2025","journal-title":"Adv. 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