Surface Micro-/Nanostructuring Using Self-Assembly of Fine Particles

Kaneko, Arata

doi:10.1007/978-981-13-0098-1_24

Cited by 2 publications

(2 citation statements)

References 51 publications

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“…CNCs are continuously transported to the self-assembling region at the solvent–air interface by the evaporation flow. Evaporation rate differences and concentration gradients with gravity can induce local capillary, Maragonni, and convective flows in the drying suspension. , Those regionally specific flows significantly impact CNC orientations, such as reorienting or disrupting the chiral nematic structures of CNCs before reaching the kinetic arrest state. Uniform solid CNC films are expected to form at even evaporation rates.…”

Section: Evaporation-induced Self-assembly For Solid Cnc Chiral Filmsmentioning

confidence: 99%

Accelerating Cellulose Nanocrystal Assembly into Chiral Nanostructures

et al. 2023

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Cellulose nanocrystal (CNC) suspensions self-assembled into chiral nematic liquid crystals. This property has enabled the development of versatile optical materials with fascinating properties. Nevertheless, the scale-up production and commercial success of chiral nematic CNC superstructures face significant challenges. Fabrication of chiral nematic CNC nanostructures suffers from a ubiquitous pernicious trade-off between uniform chiral nematic structure and rapid self-assembly. Specifically, the chiral nematic assembly of CNCs is a time-consuming, spontaneous process that involves the organization of particles into ordered nanostructures as the solvent evaporates. This review is driven by the interest in accelerating chiral nematic CNC assembly and promoting a long-range oriented chiral nematic CNC superstructure. To start this review, the chirality origins of CNC and CNC aggregates are analyzed. This is followed by a summary of the recent advances in stimuli-accelerated chiral nematic CNC self-assembly procedures, including evaporation-induced self-assembly, continuous coating, vacuum-assisted self-assembly, and shear-induced CNC assembly under confinement. In particular, stimuli-induced unwinding, alignment, and relaxation of chiral nematic structures were highlighted, offering a significant link between the accelerated assembly approaches and uniform chiral nematic nanostructures. Ultimately, future opportunities and challenges for rapid chiral nematic CNC assembly are discussed for more innovative and exciting applications.

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Section: Evaporation-induced Self-assembly For Solid Cnc Chiral Filmsmentioning

confidence: 99%

Accelerating Cellulose Nanocrystal Assembly into Chiral Nanostructures

et al. 2023

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“…Recent advances in the fabrication of ordered arrays include bottom-up approaches based on the self-assembly of NPs, which represents a cost-effective method. Self-assembly involves the evaporation of a suspension on a solid surface [ 11 ]. To be able to obtain a local deposition of NPs, the self-assembly process should be performed on regions of the substrate with enhanced adhesion using physical, chemical, or biochemical bonding.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle Printing for Microfluidic Applications: Bipolar Electrochemistry and Localized Raman Sensing Spots

Broccoli

Vollertsen

Roels³

et al. 2023

Micromachines

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The local integration of metal nanoparticle films on 3D-structured polydimethylsiloxane (PDMS)-based microfluidic devices is of high importance for applications including electronics, electrochemistry, electrocatalysis, and localized Raman sensing. Conventional processes to locally deposit and pattern metal nanoparticles require multiple steps and shadow masks, or access to cleanroom facilities, and therefore, are relatively imprecise, or time and cost-ineffective. As an alternative, we present an aerosol-based direct-write method, in which patterns of nanoparticles generated via spark ablation are locally printed with sub-mm size and precision inside of microfluidic structures without the use of lithography or other masking methods. As proof of principle, films of Pt or Ag nanoparticles were printed in the chambers of a multiplexed microfluidic device and successfully used for two different applications: Screening electrochemical activity in a high-throughput fashion, and localized sensing of chemicals via surface-enhanced Raman spectroscopy (SERS). The versatility of the approach will enable the generation of functional microfluidic devices for applications that include sensing, high-throughput screening platforms, and microreactors using catalytically driven chemical conversions.

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Surface Micro-/Nanostructuring Using Self-Assembly of Fine Particles

Cited by 2 publications

References 51 publications

Accelerating Cellulose Nanocrystal Assembly into Chiral Nanostructures

Accelerating Cellulose Nanocrystal Assembly into Chiral Nanostructures

Nanoparticle Printing for Microfluidic Applications: Bipolar Electrochemistry and Localized Raman Sensing Spots

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