Superhydrophobicity: 3D‐Printed Biomimetic Super‐Hydrophobic Structure for Microdroplet Manipulation and Oil/Water Separation (Adv. Mater. 9/2018)

Yang, Yang; Li, Xiangjia; Zheng, Xuan; Chen, Zeyu; Zhou, Qifa; Chen, Yong

doi:10.1002/adma.201870062

Cited by 28 publications

(41 citation statements)

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“…To achieve precise fabrication, the exposure time had to be adjusted dynamically based on the exposure area of light beam. [ 24 ] The tip of the MN printed with MF‐3DP was as small as 8 µm, which is crucial because the sharpness of such a fine tip can greatly reduce the pain experienced during insertion (Figure S4, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…[22,23] Moreover, the magnetic field-assisted processes have the capability to realize alignment in any spatial directions by applying specially designed magnetic field, and the magnetic field will lead to the alignment of particles/fibers without the contact of the magnet and the composites, while for the electric field, the electrodes have to be immersed in the composite to work effectively. [20][21][22][23][24][25][26][27][28][29][30][31][32][33] In this work, a MF-3DP process was developed by integrating a dynamic magnetic field with microscale mask image projection-based stereolithography (Figure 2a). In this process, a controllable magnetic field was applied in the printing region, which was filled with photocurable composite material.…”

Section: Mf-3dp Of Limpet Tooth-inspired Mnsmentioning

confidence: 99%

“…[20] 3D printing has created new opportunities for manipulating and fabricating such multi-scale, multi-material, and multi-functional structures by providing superior control over the formation of geometric shapes. [23][24][25] The unique ability of 3D printing to create biomimetic structures opens the door to new possibilities for the fabrication and processing of MNs with improved mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

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Limpet Tooth‐Inspired Painless Microneedles Fabricated by Magnetic Field‐Assisted 3D Printing

Shan

Yang

et al. 2020

Adv Funct Materials

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Microneedle arrays show many advantages in drug delivery applications due to their convenience and reduced risk of infection. Compared to other microscale manufacturing methods, 3D printing easily overcomes challenges in the fabrication of microneedles with complex geometric shapes and multifunctional performance. However, due to material characteristics and limitations on printing capability, there are still bottlenecks to overcome for 3D printed microneedles to achieve the mechanical performance needed for various clinical applications. The hierarchical structures in limpet teeth, which are extraordinarily strong, result from aligned fibers of mineralized tissue and protein‐based polymer reinforced frameworks. These structures provide design inspiration for mechanically reinforced biomedical microneedles. Here, a bioinspired microneedle array is fabricated using magnetic field‐assisted 3D printing (MF‐3DP). Micro‐bundles of aligned iron oxide nanoparticles (aIOs) are encapsulated by polymer matrix during the printing process. A bioinspired 3D‐printed painless microneedle array is fabricated, and suitability of this microneedle patch for drug delivery during long‐term wear is demonstrated. The results reported here provide insights into how the geometrical morphology of microneedles can be optimized for the painless drug delivery in clinical trials.

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Section: Resultsmentioning

confidence: 99%

Section: Mf-3dp Of Limpet Tooth-inspired Mnsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Limpet Tooth‐Inspired Painless Microneedles Fabricated by Magnetic Field‐Assisted 3D Printing

Shan

Yang

et al. 2020

Adv Funct Materials

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“…Superhydrophobic surfaces inspired by animals and plants are recently explored seeking advanced liquid manipulation. − The surface wettability is determined by surface energy and topographic features. − For example, rose-petal and lotus-leaf effects exhibit two distinct natural superhydrophobic characteristics, leading to “water pinning” and “water rolling” effects, respectively. The rose-petal-like super-hydrophobicity has proven to play an important role in the manipulation of microdroplets. , A variety of efforts have been made to achieve “rose-petal-like” superhydrophobic surfaces with controlled wettability characteristics for liquid droplet handling. ,− Zhang et al prepared biomimetic films with multilayers of microstructures by a template method, the adhesive forces of which were adjusted from 8.3 up to 57 μN. Water droplet transfer from low-to-high-adhesion surfaces was demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Fast Assembly of Wettability-Finely-Tunable Superhydrophobic Surfaces for Lossless Droplet Transfer

Fan

Yan

Qian

et al. 2022

ACS Appl. Mater. Interfaces

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Rose-petal-like superhydrophobic surfaces with strong water adhesion are promising for microdroplet manipulation and lossless droplet transfer. Assembly of self-grown micropillars on shape-memory polymer sheets with their surface adhesion finely tunable was enabled using a picosecond laser microprocessing system in a simple, fast, and large-scale manner. The processing speed of the wettability-finely-tunable superhydrophobic surfaces is up to 0.5 cm2/min, around 50–100 times faster than the conventional lithography methods. By adjusting the micropillar height, diameter, and bending angle, as well as superhydrophobic chemical treatment, the contact angle and adhesive force of water droplets on the micropillar-textured surfaces can be tuned from 117.1° up to 165° and 15.4 up to 200.6 μN, respectively. Theoretical analysis suggests a well-defined wetting-state transition with respect to the micropillar size and provides a clear guideline for microstructure design for achieving a stabilized superhydrophobic region. Droplet handling devices, including liquid handling tweezers and gloves, were fabricated from the micropillar-textured surfaces, and lossless liquid transfer of various liquids among various surfaces was demonstrated using these devices. The superhydrophobic surfaces serve as a microreactor platform to perform and reveal the chemical reaction process under a space-constrained condition. The superhydrophobic surfaces with self-assembled micropillars promise great potential in the fields of lossless droplet transfer, biomedical detection, chemical engineering, and microfluidics.

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“…Liquid repellence characterization requires different means. The most common means to characterize the antispreading ability is to measure the static contact angle (CA) and sliding angle (SA) of the droplet on the surface. − Antiadhesion ability can be characterized by contact angle hysteresis (CAH), which was obtained by contacting the droplet with the surface of the structure and then pressing the droplet and pulling it up. ,,, Furthermore, by releasing the droplet at different heights above the surface, its impact process on the surface can be observed to characterize the antipenetration ability of the surface. ,, The common feature of the above-mentioned characterization methods is that the characterized structures remain stationary (Table S1); however, the liquid repellence often occurs in motion scenarios whereas the dynamic characteristic of liquid repellence in these scenarios is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser-Assisted Top-Restricted Self-Growth Re-Entrant Structures on Shape Memory Polymer for Dynamic Pressure Resistance

Shi

Zhang

et al. 2020

Langmuir

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Bioinspired surface material with re-entrant texture has been proven effective in exhibiting good pressure resistance to droplets with low surface tension under static conditions. In this work, we combined femtosecond laser cutting with shape memory polymer (SMP) and tape to fabricate re-entrant micropillar arrays by proposing a toprestricted self-growth (TRSG) strategy. Our proposed TRSG strategy simplifies the fabrication process and improves the processing efficiency of the re-entrant structure-based surface material. The structural parameters of the re-entrant micropillar array (microdisk diameter D, center-to-center distance P, and height H) can be adjusted through our TRSG processing method. To better characterize the anti-infiltration ability of various re-entrant micropillars, we studied the dynamic process of ethylene glycol droplet deformation by applying external vertical vibration to the surface material. Three parameters (vibration mode, amplitude, and frequency) of the external excitation and structural parameters of the re-entrant micropillar array were systemically investigated. We found that the surface material had better dynamic pressure resistance when P and D of the re-entrant texture were 650 and 500 μm, respectively, after heating for 6 min. This work provides new insights into the preparation and characterization of the surface material, which may find potential applications in microdroplet manipulation, drug testing, and biological sensors.

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Superhydrophobicity: 3D‐Printed Biomimetic Super‐Hydrophobic Structure for Microdroplet Manipulation and Oil/Water Separation (Adv. Mater. 9/2018)

Cited by 28 publications

References 0 publications

Limpet Tooth‐Inspired Painless Microneedles Fabricated by Magnetic Field‐Assisted 3D Printing

Limpet Tooth‐Inspired Painless Microneedles Fabricated by Magnetic Field‐Assisted 3D Printing

Laser-Induced Fast Assembly of Wettability-Finely-Tunable Superhydrophobic Surfaces for Lossless Droplet Transfer

Femtosecond Laser-Assisted Top-Restricted Self-Growth Re-Entrant Structures on Shape Memory Polymer for Dynamic Pressure Resistance

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