Evaporation driven smart patterning of microparticles on a rigid-soft composite substrate.

Autor: Iqbal R; Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1, Tancha, Onna-san, Okinawa 904-0495, Japan; Micro-Nano-Biofluidics Unit, Indian Institute of Technology Madras, Chennai 600036, India., Matsumoto A; Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1, Tancha, Onna-san, Okinawa 904-0495, Japan., Carlson D; Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1, Tancha, Onna-san, Okinawa 904-0495, Japan., Peters KT; Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1, Tancha, Onna-san, Okinawa 904-0495, Japan., Funari R; Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1, Tancha, Onna-san, Okinawa 904-0495, Japan; Department of Physics M. Merlin, Università degli Studi di Bari Aldo Moro, via Amendola, 173, Bari 70125, Italy., Sen AK; Micro-Nano-Biofluidics Unit, Indian Institute of Technology Madras, Chennai 600036, India. Electronic address: ashis@iitm.ac.in., Shen AQ; Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1, Tancha, Onna-san, Okinawa 904-0495, Japan. Electronic address: amy.shen@oist.jp.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2022 Oct; Vol. 623, pp. 927-937. Date of Electronic Publication: 2022 May 23.
DOI: 10.1016/j.jcis.2022.05.087
Abstrakt: Hypothesis: A liquid droplet on a rigid polydimethylsiloxane (PDMS) substrate exhibits a higher receding contact angle (θ r ), therefore, recedes earlier than its softer counterpart. The three-phase contact line of a suspension droplet on a composite rigid-soft PDMS substrate can be selectively tuned wherein the contact line recedes on the rigid substrate sooner and approaches toward the softer side, with microparticles eventually being deposited in the softer substrate region.
Experiments: A composite PDMS substrate containing soft cores of various shapes (circular and non-circular) surrounded by rigid matrices was fabricated by employing 3D printing and soft lithography. A sessile suspension droplet containing spherical microparticles was deposited on the composite substrate and evaporated under ambient conditions. The evaporation dynamics was recorded and analyzed.
Findings: Evaporation-induced patterning (in circular, triangular, and rectangular areas) with sizes ranging from microns to millimetres were obtained. For the first time, by varying the ratio of the rigid-soft regions in the PDMS substrate, we were able to obtain different deposition sizes and shapes from an identical droplet. Instead of using lithographically patterned substrate, our simple methodology by using 3D printing and soft lithography opened up a new avenue for patterning microparticles based on a rigid-soft composite substrate.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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