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Li W, Zhang C, Wang Y. Evaporative self-assembly in colloidal droplets: Emergence of ordered structures from complex fluids. Adv Colloid Interface Sci 2024; 333:103286. [PMID: 39232473 DOI: 10.1016/j.cis.2024.103286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2024] [Revised: 07/14/2024] [Accepted: 08/26/2024] [Indexed: 09/06/2024]
Abstract
Colloidal droplet evaporation is an intriguing and intricate phenomenon that has captured the interest of scientists across diverse disciplines, including physical chemistry, fluid dynamics, and soft matter science, over the past two decades. Despite being a non-equilibrium system with inherent challenges posed by coffee ring formation and Marangoni effects, which hinder the precise control of deposition patterns, evaporative self-assembly presents a convenient and cost-effective approach for generating arrays of well-ordered structures and functional patterns with wide-ranging applications in inkjet printing, photonic crystals, and biochemical assays. In the realm of printed electronics and photonics, effectively mitigating coffee rings while achieving uniformity and orderliness has emerged as a critical factor in realising the next generation of large-area, low-cost, flexible devices that are exceptionally sensitive and high-performance. This review highlights the evaporative self-assembly process in colloidal droplets with a focus on the intricate mechanical environment, self-assembly at diverse interfaces, and potential applications of these assembling ordered structures.
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Affiliation(s)
- Weibin Li
- National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China; School of Engineering Science, University of Chinese Academy of Sciences, 100049 Beijing, China.
| | - Chen Zhang
- National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China; School of Engineering Science, University of Chinese Academy of Sciences, 100049 Beijing, China
| | - Yuren Wang
- National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China; School of Engineering Science, University of Chinese Academy of Sciences, 100049 Beijing, China
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Wei J, Yi Z, Yang L, Zhang L, Yang J, Qin M, Cao S. Photonic crystal gas sensors based on metal-organic frameworks and polymers. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:4901-4916. [PMID: 38979999 DOI: 10.1039/d4ay00764f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/10/2024]
Abstract
A photonic crystal (PC) is an optical microstructure with an adjustable dielectric constant. The PC sensor was deemed a powerful tool for gas molecule detection due to its excellent sensitivity, stability, online use and tailorable optical performance. The detection signals are generated by monitoring the changes of the photonic band gap when the sensing behavior occurs. Recently, many efforts have been devoted to improving the PC sensor's detection performance and reducing technical costs by selecting and refining functional materials. In this case, metal-organic frameworks (MOFs) with a large specific surface, tunable structural properties and polymers with unique swelling properties have attracted increasingly attention. In this review, a systematic review of PC gas sensors based on MOFs and polymers was carried out for the first time. Firstly, the optical properties and gas sensing mechanism of PCs were briefly summarized. Secondly, a detailed discussion of the structural properties and rapid preparation methods of distributed Bragg reflectors (DBRs), opals and inverse opals (IOPCs) was presented. Thirdly, the recent advances in MOF, polymer and MOF/polymer-based PC sensors over the past few years were summarized. It should be noted that the sensitivity and selectivity enhancement strategy by appropriate material species selection, organic ligand functionalization, metal-ion doping, diverse functional material arrays, and multi-component compounding were analyzed in detail. Finally, prospects on PC gas sensors are given in terms of preparation methods, material functionalization and future applications.
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Affiliation(s)
- Jianan Wei
- State Key Laboratory of NBC Protection for Civilian, Beijing, China.
| | - Zhihao Yi
- State Key Laboratory of NBC Protection for Civilian, Beijing, China.
| | - Liu Yang
- State Key Laboratory of NBC Protection for Civilian, Beijing, China.
| | - Ling Zhang
- State Key Laboratory of NBC Protection for Civilian, Beijing, China.
| | - Junchao Yang
- State Key Laboratory of NBC Protection for Civilian, Beijing, China.
| | - Molin Qin
- State Key Laboratory of NBC Protection for Civilian, Beijing, China.
| | - Shuya Cao
- State Key Laboratory of NBC Protection for Civilian, Beijing, China.
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Roslyakov IV, Kushnir SE, Novikov VB, Dotsenko AA, Tsymbarenko DM, Sapoletova NA, Murzina TV, Stolyarov VS, Napolskii KS. Three-Dimensional Photonic Crystals Based on Porous Anodic Aluminum Oxide. J Phys Chem Lett 2024; 15:4319-4326. [PMID: 38619331 DOI: 10.1021/acs.jpclett.4c00537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
Photonic crystals (PCs) consisting of a periodic arrangement of holes in dielectric media have found success in light manipulation and sensing. Among them, three-dimensional (3D) PCs are in high demand due to their unique properties originating from multiple photonic band gaps (PBGs) and even full ones. Here, 3D PCs based on porous anodic aluminum oxide (AAO) were fabricated for the first time. Our approach involves prepatterning of the aluminum surface by a focused ion beam to form a hexagonal array of pore nuclei. Subsequent anodization in 1 M H3PO3 using a sine wave profile of voltage provides AAO with a defect-free in-plane porous structure and out-of-plane porosity modulation. The ability to tune the position, width, and depth of the PBGs is demonstrated. The combination of the flexibility of the proposed approach with the unique properties of AAO extends the range of practical applications of 3D PCs far beyond the current achievements.
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Affiliation(s)
- Ilya V Roslyakov
- Department of Materials Science, Lomonosov Moscow State University, 119991 Moscow, Russia
- Kurnakov Institute of General and Inorganic Chemistry RAS, 119991 Moscow, Russia
| | - Sergey E Kushnir
- Department of Materials Science, Lomonosov Moscow State University, 119991 Moscow, Russia
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Vladimir B Novikov
- Department of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Andrey A Dotsenko
- Department of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Dmitry M Tsymbarenko
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Nina A Sapoletova
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Tatiana V Murzina
- Department of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Vasily S Stolyarov
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastian, Spain
- LPEM, ESPCI Paris, PSL Research University, 75005 Paris, France
| | - Kirill S Napolskii
- Department of Materials Science, Lomonosov Moscow State University, 119991 Moscow, Russia
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
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Lu H, Wang D, Huang D, Feng L, Zhang H, Zhu P. Product from sessile droplet evaporation of PNIPAM/water system above LCST: A block or micro/nano-particles? J Colloid Interface Sci 2023; 634:769-781. [PMID: 36565619 DOI: 10.1016/j.jcis.2022.12.097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 12/16/2022] [Accepted: 12/18/2022] [Indexed: 12/24/2022]
Abstract
PNIPAM as a stimuli-responsive polymer has generated extreme interests due to its versatile applications. However, there is no research report on whether PNIPAM micro/nano-particles can be extracted from its suspension after phase separation. In the present work, LCST-type phase separation in self-synthesized PNIPAM/water system was investigated in depth by dividing the DLS testing process into four stages. In addition to quenching duration, temperature rise process, quenching temperature and PNIPAM concentration all have a great influence on particle size of the suspension. Meanwhile, the steady-state rheology and dynamic viscoelasticity results show that PNIPAM micro/nano-particles in the suspension are "soft" that can deform. Finally, FE-SEM was used to observe the morphology of dehydrated PNIPAM extracted by sessile droplet evaporation under different conditions. The results indicate that these "soft" particles are easier to fuse together, do not have sufficient mechanical strength to maintain their spherical morphology after dehydration. But the above fusion can be suppressed by adjusting evaporation conditions to acquire smaller PNIPAM particles which have sufficient mechanical properties to keep their basic particle morphology. Further, by changing evaporation pressure to positive or negative pressure, dehydrated PNIPAM micro/nano-particles with excellent uniformity and separation can be obtained. This work will provide guidance for extracting micro/nano-particles from polymer/diluent systems with LCST.
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Affiliation(s)
- Hongwei Lu
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
| | - Danling Wang
- Zhongce Rubber Group Co., Ltd, Hangzhou, Zhejiang 310018, China
| | - Daye Huang
- Zhongce Rubber Group Co., Ltd, Hangzhou, Zhejiang 310018, China
| | - Luyao Feng
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
| | - Huapeng Zhang
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
| | - Peng Zhu
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China.
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