Biomimetic Superhydrophobic Hollowed-Out Pyramid Surface Based on Self-Assembly

Luo, Weipeng; Yu, Bin; Xiao, Dingbang; Zhang, Meng; Wu, Xuezhong; Li, Guoxi

doi:10.3390/ma11050813

Cited by 6 publications

(3 citation statements)

References 52 publications

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“…surface still has more than 150° contact angles in strong acids and strong bases. Luo et al [133] fabricated a hollow pyramid microstructure by using capillary induction and lithography. The column structure is prepared by photoresist, and then the surrounding four columns are formed by self-assembly.…”

Section: Other Methodsmentioning

confidence: 99%

Recent Developments of Superhydrophobic Surfaces (SHS) for Underwater Drag Reduction Opportunities and Challenges

Feng

Sun

Tian

2021

Adv Materials Inter

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Superhydrophobic surfaces (SHS) for underwater drag reduction draw more and more attention owing to its promising and wide applications such as underwater vehicles, pipeline oil transportation, and aquaculture. However, the drag reduction properties are inextricably linked to the stability of air layer on SHS. This review highlights recent advances regarding SHS for underwater drag reduction in the past three years. First, the fundamental theories are briefly described. Next, the crucial influencing factors, which include dimension and arrangement of particles, layout, and shape of the microstructures, Reynolds number, and attack angle on underwater drag reducing performance of SHS are thoroughly listed. Furthermore, the superior or inferior of these manufacturing techniques is also individually illustrated. After that, the solutions of enhancing stability of the air layer are explicitly classified. Then, the practical applications and its potential value in ships and underwater vehicles, microchannels, as well as fabrics are briefly discussed. Finally, the remaining challenges and promising breakthroughs in the field of SHS for underwater drag reduction are clarified in depth.

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Section: Other Methodsmentioning

confidence: 99%

Recent Developments of Superhydrophobic Surfaces (SHS) for Underwater Drag Reduction Opportunities and Challenges

Feng

Sun

Tian

2021

Adv Materials Inter

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“…The material structure of the printed samples can be examined by scanning electron microscopy (SEM) before and after the dissolution test in order to study the role of polymer porosity and the influence of pore size on the dissolution [ 34 ]. For example, a research group examined chitin‒PLA-laminated implantable film by SEM to determine the surface properties [ 23 ], and another research group investigated scaffolds composed of polylactide-co-glycolide (PLGA) and hydroxyapatite (HA) [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

In Vitro Tests of FDM 3D-Printed Diclofenac Sodium-Containing Implants

et al. 2020

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One of the most promising emerging innovations in personalized medication is based on 3D printing technology. For use as authorized medications, 3D-printed products require different in vitro tests, including dissolution and biocompatibility investigations. Our objective was to manufacture implantable drug delivery systems using fused deposition modeling, and in vitro tests were performed for the assessment of these products. Polylactic acid, antibacterial polylactic acid, polyethylene terephthalate glycol, and poly(methyl methacrylate) filaments were selected, and samples with 16, 19, or 22 mm diameters and 0%, 5%, 10%, or 15% infill percentages were produced. The dissolution test was performed by a USP dissolution apparatus 1. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide dye (MTT)-based prolonged cytotoxicity test was performed on Caco-2 cells to certify the cytocompatibility properties. The implantable drug delivery systems were characterized by thermogravimetric and heatflow assay, contact angle measurement, scanning electron microscopy, microcomputed tomography, and Raman spectroscopy. Based on our results, it can be stated that the samples are considered nontoxic. The dissolution profiles are influenced by the material properties of the polymers, the diameter, and the infill percentage. Our results confirm the potential of fused deposition modeling (FDM) 3D printing for the manufacturing of different implantable drug delivery systems in personalized medicine and may be applied during surgical interventions.

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“…This "hierarchical" surface morphology can be reproduced by different physical or technological procedures: the emulsion of metallic particles with PTFE [20,21], PTFE coating surface treatment with plasma [22][23][24][25][26][27][28][29] or Nd:YAG laser ablation, among other laser technologies [30][31][32][33][34][35][36][37], are an example of this. Other research work has addressed metals, which are roughened and then chemically treated to decrease their surface energy [38], or incorporating directly surface roughness or micro-texture on a hydrophobic material [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Water-Repellent Fluoropolymer-Based Coatings

et al. 2019

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Fluoropolymer-based coatings are widely used for release applications. However, these hydrophobic surfaces do not reveal a significantly low adhesion. Water repellency incorporated to fluoropolymer coatings might enhance their release performance. In this work, we focused on the surface texturing of a well-known polytetrafluoroethylene (PTFE)-based coating. We explored as texturing routes: sanding, sandblasting and laser ablation. We examined the surface roughness with white light confocal microscopy and the surface morphology with environmental scanning electron microscopy (ESEM). Water-repellent fluoropolymer coatings were reproduced in all cases, although with different degree, parametrized with bounces of water drops (4–5 μL). Laser ablation enabled the lowest adhesion of coatings with 24 ± 2 bounces. This result and the current development of laser patterning for industry assure the incipient use of laser ablation for release coatings.

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Biomimetic Superhydrophobic Hollowed-Out Pyramid Surface Based on Self-Assembly

Cited by 6 publications

References 52 publications

Recent Developments of Superhydrophobic Surfaces (SHS) for Underwater Drag Reduction Opportunities and Challenges

Recent Developments of Superhydrophobic Surfaces (SHS) for Underwater Drag Reduction Opportunities and Challenges

In Vitro Tests of FDM 3D-Printed Diclofenac Sodium-Containing Implants

Water-Repellent Fluoropolymer-Based Coatings

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