Chiral Assemblies of Laser‐Printed Micropillars Directed by Asymmetrical Capillary Force

materials with gradients inspired by biological surfaces has therefore attracted much interest. Strategies for preparing gradient surfaces include vapor-phase diffusion, gradual immersion, electrochemical oxidation, and photolithography that have broadly adopted. [20-26] However, their material constraints, tedious and time-consuming processes, and their single-pattern limit their widespread use. Developing a substrate-independent, facile and efficient, pattern-diverse method for preparing gradient surfaces would aid fundamental science and practical application. Among various techniques, laser processing has recently emerged as a powerful tool in integratedoptics and biomimetic micro-nanodevices. This technology can be used to precisely control the preparation of micro/nanoscale structures on various substrates such as metals, glass, ceramics, and polymers. [27-33] Besides, the high energy density of lasers allows the machining process to be completed quickly and efficiently. Combining laser machining with computer-aided control allows laser ablation parameters to be precisely controlled, including the processing position, scanning speed, scanning interval, and scanning track. Laser processing can therefore be used to produce flexible and diverse patterns in complex workpieces. And laser micro/nano fabrication has been applied to regulate surface wettability. [34-43] Therefore, laser processing has great potential for developing samples with different wettability and geometries on various materials. This review discusses laser fabrication of bioinspired gradient surfaces for wettability applications, whose overview is shown in Figure 1. The related backgrounds including gradient surfaces in natural creatures, the theoretical basis of wettability, and the distinct characteristics of laser processing are introduced. Gradient surfaces can be classified into wettability gradients and geometric gradients, and they are discussed in terms of various laser fabrication approaches and wettability applications. It is worth mentioning the definition of wettability gradient and geometric gradient in this review. Wettability gradient is defined as a surface with no obvious geometric change in the shape, and there is a difference of contact angles on the macro level resulting from the roughness gradient on the micro level. Geometric gradient is defined as a surface possessing significant geometric changes in the shape, but not much difference in the roughness of the entire surface at the microscopic level. Specially, a wettability gradient surface generates a water driving force as a result of its varying surface roughness. Wettability gradient surfaces can be applied in water droplet control, Inspired by nature, gradient surfaces have attracted broad research interest because of their potential in microfluidics, fog/water collection, and water electrolysis. Among the various techniques for preparing gradient surfaces, laser processing is substrate-independent, facile and efficient, patterndiverse, which can be used to prepare...

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Section: Laser Processingmentioning

confidence: 99%

“…Hu et al utilized the flexibility of femtosecond laser printing to control the geometry and spatial topology of micropillars synergistically, thus generating capillar-induced chiral self-assembly ( Figure 4f). [97] They prepared diverse mesoscale hierarchical assemblies with different handedness.…”

Section: Laser Processingmentioning

confidence: 99%

Laser Fabrication of Bioinspired Gradient Surfaces for Wettability Applications

Yin

Xiao

et al. 2021

Adv Materials Inter

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“…Femtosecond (fs) laser-induced multiphoton absorption enables tailoring the material structures and properties inside transparent bulk materials with high processing precision and triggers a great deal of activity in the field of photonics. [5][6][7][8][9][10][11][12][13] In particular, the fs laser can induce a permanent refractive index change in glass, which indicates a promising tool to fabricate photonic circuits, waveguides (WGs), and basic elements in integrated optics. 5,14,15 FLDW has been identified to be an effective technique for constructing WGs in a 3D fashion over a large depth from the micrometer to millimeter scale.…”

Section: Introductionmentioning

confidence: 99%

Photonic circuits written by femtosecond laser in glass: improved fabrication and recent progress in photonic devices

et al. 2021

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Integrated photonics is attracting considerable attention and has found many applications in both classical and quantum optics, fulfilling the requirements for the ever-growing complexity in modern optical experiments and big data communication. Femtosecond (fs) laser direct writing (FLDW) is an acknowledged technique for producing waveguides (WGs) in transparent glass that have been used to construct complex integrated photonic devices. FLDW possesses unique features, such as three-dimensional fabrication geometry, rapid prototyping, and single step fabrication, which are important for integrated communication devices and quantum photonic and astrophotonic technologies. To fully take advantage of FLDW, considerable efforts have been made to produce WGs over a large depth with low propagation loss, coupling loss, bend loss, and highly symmetrical mode field. We summarize the improved techniques as well as the mechanisms for writing high-performance WGs with controllable morphology of cross-section, highly symmetrical mode field, low loss, and high processing uniformity and efficiency, and discuss the recent progress of WGs in photonic integrated devices for communication, topological physics, quantum information processing, and astrophotonics. Prospective challenges and future research directions in this field are also pointed out.

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“…We examine the working principles of permanently shape-fixable deformation, as well as the reversibly reconfigurable deformation of pillar arrays. Driving forces of the deformations include capillary force-, 36,[40][41][42] light-, [43][44][45][46][47][48][49][50][51][52][53][54] magnetic field, [55][56][57][58][59][60] and thermal sources. [61][62][63][64][65][66][67][68][69][70][71] For example, capillary aggregation is driven by the breaking force balance applied to the adjacent pillars and it is determined by stationary dimensional variables which include width, height and spacing of the pillars.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and applications of stimuli‐responsive micro/nanopillar arrays

Park

Won

Cho

et al. 2021

Journal of Polymer Science

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The functional surface features of living creatures are driven by the complex morphology of periodically arranged micro/nanoscale structures. Various fabrication processes have been devised mimic the performance of natural features; these methods morph hierarchical and multi-leveled pillar arrays, such as top-down, bottom-up, and a hybrid of top-down and bottom-up processes.Different methodologies are employed depending on the materials, such as polymeric composites, metal oxides, metals, and carbon nanotubes. In this review, we discuss the shape-reconfiguration of stimuli-responsive micro/ nanopillar arrays achieved by capillary force, light, magnetic field, and heat. In particular, photo-and magnetic actuation of pillar arrays revealed programmability according to the arrangement of the liquid crystal molecules or magnetic particles by remote control. Furthermore, applications of micro/nanopillar arrays, such as adhesives, omniphobicity, optics, and biomedical technologies, are also discussed.

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Chiral Assemblies of Laser‐Printed Micropillars Directed by Asymmetrical Capillary Force

Cited by 46 publications

References 39 publications

Laser Fabrication of Bioinspired Gradient Surfaces for Wettability Applications

Laser Fabrication of Bioinspired Gradient Surfaces for Wettability Applications

Photonic circuits written by femtosecond laser in glass: improved fabrication and recent progress in photonic devices

Fabrication and applications of stimuli‐responsive micro/nanopillar arrays

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