Three-dimensional clustering of Janus cylinders by convex curvature and hydrophobic interactions

Kim, Jongmin Kim; Oh, OH Myung Seok; Choi, Ch Choi Chang-Hyung; Kang, Sm Kang Sung-Min; Kwak, Mj Kwak Moo Jin; You, Jae Bem; Im, Sg Im Sung Gap; Lee, Chang‐Soo

doi:10.1039/c5sm00734h

Cited by 7 publications

(11 citation statements)

References 75 publications

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“…This probability is defined as the number of the constituent Janus cylinders in a cluster. 28 In ethanol and methanol, dimers (N = 2) are mainly formed, while trimers (N = 3) and tetramers (N = 4) are rarely formed. In water, the clusters mostly consist of multiple cylinders (N > 4), rather than forming dimers, as shown in Figure 1B.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

Directed Assembly of Janus Cylinders by Controlling the Solvent Polarity

et al. 2017

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This study demonstrates the possibility of controlling the directed self-assembly of microsized Janus cylinders by changing the solvent polarity of the assembly media. Experimental results are analyzed and theoretical calculations of the free energy of adhesion (ΔG) are performed to elucidate the underlying basic principles and investigate the effects of the solvent on the self-assembled structures. This approach will pave a predictive route for controlling the structures of assembly depending on the solvent polarity. In particular, we find that a binary solvent system with precisely controlled polarity induces directional assembly of the microsized Janus cylinders. Thus, the formation of two-dimensional (2D) and three-dimensional (3D) assembled clusters can be reliably tuned by controlling the numbers of constituent Janus cylinders in a binary solvent system. Finally, this approach is expanded to stepwise assembly, which forms unique microstructures via secondary growth of primary seed clusters formed by the Janus cylinders. We envision that this investigation is highly promising for the construction of desired superstructures using a wide variety of polymeric Janus microparticles with chemical and physical multicompartments.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Directed Assembly of Janus Cylinders by Controlling the Solvent Polarity

et al. 2017

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“…For the polar surface modification, P1, we use the homopolymer of the monomer, cyanoethyl acrylate. [ 28 ] For the four non‐polar surface modifications, NP1 to NP4, we use the homopolymer of the monomer butyl acrylate, [ 29 ] cyclohexyl methacrylate, [ 30 ] benzyl methacrylate, [ 31 ] or 1,3,5,7‐tetravinyl‐1,3,5,7‐tetramethylcyclotetrasiloxane, [ 32,33 ] respectively. The hydrogen bonding polymers are hydrogels formed from the iCVD copolymerization of hydroxyethyl methacrylate (HEMA) with the crosslinking monomer ethylene glycol diacrylate (EGDA), [ 34–36 ] where H100 represents a homopolymer of HEMA (100 mol% HEMA) and H0 represents a homopolymer of EGDA (0 mol% HEMA).…”

Section: Resultsmentioning

confidence: 99%

Humidity‐Initiated Gas Sensors for Volatile Organic Compounds Sensing

Robinson

Tung

Gharahcheshmeh

et al. 2021

Adv Funct Materials

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A new volatile organic compounds (VOCs) sensing concept called humidityinitiated gas (HIG) sensors is described and demonstrated. HIG sensors employ the impedance of water assembled at sensor interfaces when exposed to humidity to sense VOCs at low concentrations. Here, two HIG sensor variants are studied-Type I and Type II. Type I sensors benefit from simplicity, but are less attractive in terms of key performance metrics, including response time and detection limits. Type II sensors are more complex, but are more attractive in terms of key performance metrics. Notably, it is observed that the best-in-class Type II HIG sensors achieve <2 min response times and <10 ppb detection limit for geranyl acetone, a VOC linked to the asymptomatic form of Huanglongbing (HLB) citrus disease. Both Type I and Type II sensors are assembled from off-the-shelf materials and demonstrate remarkable stability at high humidity. HIG sensors are proposed as an attractive alternative to existing VOCs sensors for remote field detection tasks, including VOCs detection to diagnose HLB citrus disease.

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“…Self‐assembly using nanoparticles and microparticles is an advanced self‐driven manufacturing method used to produce various unique structures . To induce the 3D clustering of cylindrical Janus microparticles through hydrophobic interactions, the top parts of cylindrical Janus microparticles were coated with an iCVD polymer layer whose surface energy was precisely tuned by homogeneous copolymerization during the iCVD process . Janus microcylinders were prepared through micromolding followed by iCVD polymer coating.…”

Section: Icvd For Surface Treatmentsmentioning

confidence: 99%

“…a) Assembled 2D clusters from flat‐top Janus microcylinders with controlled hydrophobicity and bright field images of the assembled 2D clusters. (Scale bars indicate 200 µm) . b) Optical microscope images of self‐bent janus microstrips in responce to change of pH, AA contents, and active and passive layer thickness .…”

Section: Icvd For Surface Treatmentsmentioning

confidence: 99%

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Initiated Chemical Vapor Deposition: A Versatile Tool for Various Device Applications

et al. 2017

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Advances in device technology have been accompanied by the development of new types of materials and device fabrication methods. Considering device design, initiated chemical vapor deposition (iCVD) inspires innovation as a platform technology that extends the application range of a material or device. iCVD serves as a versatile tool for surface modification using functional thin film. The building of polymeric thin films from vapor phase monomers is highly desirable for the surface modification of thermally sensitive substrates. The precise control of thin film thicknesses can be achieved using iCVD, creating a conformal coating on nano-, and microstructured substrates such as membranes and microfluidics. iCVD allows for the deposition of polymer thin films of high chemical functionality, and thus, substrate surfaces can be functionalized directly from the iCVD polymer film or can selectively gain functionality through chemical reactions between functional groups on the substrate and other reactive molecules. These beneficial aspects of iCVD can spur breakthroughs in device fabrication based on the deposition of robust and functional polymer thin films. This review describes significant implications of and recent progress made in iCVD-based technologies in three fields: electronic devices, surface engineering, and biomedical applications.

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Three-dimensional clustering of Janus cylinders by convex curvature and hydrophobic interactions

Cited by 7 publications

References 75 publications

Directed Assembly of Janus Cylinders by Controlling the Solvent Polarity

Directed Assembly of Janus Cylinders by Controlling the Solvent Polarity

Humidity‐Initiated Gas Sensors for Volatile Organic Compounds Sensing

Initiated Chemical Vapor Deposition: A Versatile Tool for Various Device Applications

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