Self-Cleaning Surfaces: A Third-Year Undergraduate Research Project

Haines, Ronald S.; Wu, Alex; Zhang, Hua; Coffey, Jacob W.; Huddle, Thomas S.; Lafountaine, Justin S.; Lim, Zhi-Jun; White, Eugene A.; Tuong, Nam T.; Lamb, Robert N.

doi:10.1021/ed086p365

Cited by 7 publications

(11 citation statements)

References 10 publications

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“…Advancing and receding contact angles were also measured to determine the hysteresis by the mentioned contact angle goniometer. If an equivalent instrument is not available, a cell phone camera is sufficient to capture an image of the water droplets, which is then analyzed using the freeware ImageJ software to measure contact angles as outlined by Lamour et al A tilting table apparatus can also be easily assembled from basic laboratory equipment as per the work of Haines et al, which can replicate the results of advancing and receding contact angle measurements …”

Section: Experimental Overviewmentioning

confidence: 99%

“…Functionally, this minimizes droplet pinning, reduces contact angle hysteresis to a few degrees, and aids droplet roll-off at low tilt angles. 2 There are only a few papers that have introduced in the chemical education literature the wettability of natural surfaces, 6,17 the concept of self-cleaning, 18,19 and the relationship between hysteresis and surface heterogeneity. 19 Our experiment is novel in that it brings these concepts together across a broad range of natural plant species while also incorporating microscopic inspection of samples.…”

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confidence: 99%

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Chemical Curiosity on Campus: An Undergraduate Project on the Structure and Wettability of Natural Surfaces

et al. 2019

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An experiment which investigates the wettability of natural surfaces was developed for undergraduate students, which allows them to explore concepts of surface structure, wettability, superhydrophobic surfaces, and self-cleaning. The students choose their own samples of leaves and flowers present in their local environment, examine their surface structure and chemistry by microscopy and contact angle measurements, and, using their understanding of the literature on the wettability of rough surfaces, relate the two. The experiment is student-focused in that it gives students agency in choosing the samples to study, increases their confidence, and develops curiosity in their local environment.

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Section: Experimental Overviewmentioning

confidence: 99%

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confidence: 99%

Chemical Curiosity on Campus: An Undergraduate Project on the Structure and Wettability of Natural Surfaces

et al. 2019

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“…All surfaces can self-clean whenever the adhesion forces between surface debris and the surface are weaker than those between the contaminants and tangential fluid, leading to the debris being carried away in the fluid as it runs off the surface [ 65 , 66 ]. As such, a diverse range of inorganic and biomimetic antifouling surfaces can be fabricated by tuning the surface properties to weaken this attraction force.…”

Section: Future Cellular Composite Materials: Self Cleaning Composmentioning

confidence: 99%

Engineering Cellular Photocomposite Materials Using Convective Assembly

2013

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Fabricating industrial-scale photoreactive composite materials containing living cells, requires a deposition strategy that unifies colloid science and cell biology. Convective assembly can rapidly deposit suspended particles, including whole cells and waterborne latex polymer particles into thin (<10 µm thick), organized films with engineered adhesion, composition, thickness, and particle packing. These highly ordered composites can stabilize the diverse functions of photosynthetic cells for use as biophotoabsorbers, as artificial leaves for hydrogen or oxygen evolution, carbon dioxide assimilation, and add self-cleaning capabilities for releasing or digesting surface contaminants. This paper reviews the non-biological convective assembly literature, with an emphasis on how the method can be modified to deposit living cells starting from a batch process to its current state as a continuous process capable of fabricating larger multi-layer biocomposite coatings from diverse particle suspensions. Further development of this method will help solve the challenges of engineering multi-layered cellular photocomposite materials with high reactivity, stability, and robustness by clarifying how process, substrate, and particle parameters affect coating microstructure. We also describe how these methods can be used to selectively immobilize photosynthetic cells to create biomimetic leaves and compare these biocomposite coatings to other cellular encapsulation systems.

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“…In previous works, different replication techniques were reported. In such procedures, the replication processes are not direct methods since they require a first step to produce the LSR part and then a second step for the specific surface treatment (laser, [9,16] chemical, [14,17] plasma treatment [18] ). Moreover, while the surfaces show non-regular textures, these techniques have a low productivity rate compared to other texturing methods.…”

Section: Introductionmentioning

confidence: 99%

Micro‐ and Nanotexturization of Liquid Silicone Rubber Surfaces by Injection Molding Using Hybrid Polymer Inlays

Lozano‐Hernandez

Llanos

Comet³

et al. 2021

Macro Materials & Eng

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Micro-and nanotexturization of surfaces can give to the parts different advanced functionalities, such as superhydrophobicity, self-cleaning, or antibacterial capabilities. These advanced properties in combination with the biocompatibility of Liquid Silicone Rubber are an interesting approach for obtaining high-performance medical devices. The industrial production of surface textures in polymeric materials is through the replication technique, and the best option to attain a high production rate is injection molding. Moreover, its low viscosity during processing can provide an accurate replication capacity by the easy filling by capillarity of the microtextures. An innovative replicating technique for Liquid Silicone Rubber is presented by studying the replication of different shaped textures within a diameter range of between 2 and 50 μm. The copying process consists in the overmolding of a textured polymeric inlay obtained by nanoimprint lithography. At the end of the process, a textured part is obtained, while the imprinted film remains in the mold. The injection molding parameters are optimized to increase the replication accuracy, and their effect on texture replicability is analyzed and discussed. Finally, it is shown that the textured surfaces improve their wettability behavior, which is a necessary and important characteristic in the development of biomedical devices.

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Self-Cleaning Surfaces: A Third-Year Undergraduate Research Project

Cited by 7 publications

References 10 publications

Chemical Curiosity on Campus: An Undergraduate Project on the Structure and Wettability of Natural Surfaces

Chemical Curiosity on Campus: An Undergraduate Project on the Structure and Wettability of Natural Surfaces

Engineering Cellular Photocomposite Materials Using Convective Assembly

Micro‐ and Nanotexturization of Liquid Silicone Rubber Surfaces by Injection Molding Using Hybrid Polymer Inlays

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