Versatile micro- and nanotexturing techniques for antibacterial applications

Rowthu, Sriharitha; Hoffmann, P.

doi:10.1016/b978-0-12-814401-5.00003-7

Cited by 8 publications

(9 citation statements)

References 184 publications

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“…E. coli are rod-shaped bacteria possessing 0.8–1 μm diameter and 1.5–2.5 μm length . On the other hand, T5 textures have much bigger dimensions ( d ∼ 5.5 μm, h ∼ 10.3 μm, p ∼ 10.3 μm), which exhibited pairing (refer Figures d,k and d) of 3–4 pillars in some areas.…”

Section: Resultsmentioning

confidence: 99%

“…E. coli are rodshaped bacteria possessing 0.8−1 μm diameter and 1.5−2.5 μm length. 18 On the other hand, T5 textures have much bigger dimensions (d ∼ 5.5 μm, h ∼ 10.3 μm, p ∼ 10.3 μm), which exhibited pairing (refer Figures 7d,k and 9d) of 3−4 pillars in some areas. These provided sufficient area for small bacterial colonies to attach and grow in the triangular or cross forms.…”

Section: Wetting Properties Of Textured Sylgard 184 and Siliconementioning

confidence: 98%

“…For PDMS, the measured roughness parameters are R a = 120 ± 13 nm, R q = 250 ± 13 nm, R z = 1.4 ± 0.14 μm, R p =1.49 ± 0.73 μm, R sk = 2.88 ± 0.58 μm, and R ku = 18.74 ± 4.95 μm, while for the silicone composite, R a = 130 ± 00 nm, R q = 190 ± 50 nm, R z = 1.35 ± 0.12 μm, R p =1. 18 as reference surfaces for wetting evaluations and also to estimate surface energies. The silicone composite is magnetic in nature as revealed by its tendency to be attracted by a strong permanent magnet (see Figure S3, Supporting Information).…”

Section: Composition and Surface Energy Of Untexturedmentioning

confidence: 99%

“…Among the several materials that were rendered superhydrophobic, one of the widely employed substrate/coating materials is poly(dimethylsiloxane) (PDMS) due to its inherent hydrophobic character, biocompatibility, elasticity, ease of availability, and processing. 17 Consequently, it has been extensively utilized in microfluidics, medicine, 18 etc. In the earlier times, PDMS surfaces were textured followed by surface fluorination or silanization 19,20 to render them nonwetting.…”

Section: Introductionmentioning

confidence: 99%

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Sewage Water-Repellent PDMS and Magnetic Silicone Composites: Lab to Commercialization

Rowthu

Mattaparthi

Siringil

et al. 2023

ACS Appl. Polym. Mater.

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Liquid-repellent surfaces are beneficial for improving corrosion resistance, anti-biofouling, anti-icing, and reducing material sticking in food, beverages, cosmetics, and medical industries. However, limited research data are available on fabricating sewage water-repellent surfaces, which should repel suspended organic/inorganic and biological matter in addition to water. Herein, we unveil the sewage water repellency and superhydrophobicity of magnetic silicone composites and poly-(dimethylsiloxane) (PDMS). Hexagonally arranged microconical pillars (Wenzel roughness of 1.2−2.4) were printed via hot embossing and replica molding methodologies. High static contact angles of ∼160°, low contact angle hystereses of ∼5°, and low roll-off angles of ∼5°were achieved. At least 30 textured silicone composites were fabricated by successively hot embossing from a single custom-made and durable commercializable Ni−steel mold. All of them demonstrated excellent replication efficiency and retained superhydrophobicity and sewage water repellency as a function of embossing cycles. Furthermore, sewage water and deionized water droplets bounced off the silicone composite surface for a Weber number of up to 149, revealing a robust Cassie configuration. Furthermore, textured surfaces retained under-sewage water phobicity for up to 24 h, when submerged at 3 cm depth (0.3 kPa gauge pressure), wherein coated and untextured surfaces have failed just within 15 min, i.e., covered by a liquid film or sticky droplets. Also, textured surfaces inhibited the growth of the Escherichia coli bacterium, while a huge biofilm was observed on the untextured region. Briefly, this is the first demonstration of a one-step, upscalable, and facile hot embossing methodology to manufacture sewage water-repellent silicone composite and PDMS surfaces.

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Section: Resultsmentioning

confidence: 99%

Section: Wetting Properties Of Textured Sylgard 184 and Siliconementioning

confidence: 98%

Section: Composition and Surface Energy Of Untexturedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sewage Water-Repellent PDMS and Magnetic Silicone Composites: Lab to Commercialization

Rowthu

Mattaparthi

Siringil

et al. 2023

ACS Appl. Polym. Mater.

Self Cite

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“…On the other hand, silver, in the form of ions or nanoparticles, is one of the most effective antimicrobial agents [30]. The overall surface topography can effectively prevent bacterial adhesion [31][32][33] by reducing the contact points or by exerting mechanical pressure [34] on the bacterial cells, which could lead to cell rupture. Laser surface texturing represents a promising method, as an alternative to coatings, to realize antimicrobial surfaces [35,36] by modifying their topography and chemical properties.…”

Section: Introductionmentioning

confidence: 99%

Single-Step Process for Titanium Surface Micro- and Nano-Structuring and In Situ Silver Nanoparticles Formation by Ultra-Short Laser Patterning

et al. 2022

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Ultra-short laser (USL)-induced surface structuring combined with nanoparticles synthesis by multiphoton photoreduction represents a novel single-step approach for commercially pure titanium (cp-Ti) surface enhancement. Such a combination leads to the formation of distinct topographical features covered by nanoparticles. The USL processing of cp-Ti in an aqueous solution of silver nitrate (AgNO3) induces the formation of micron-sized spikes surmounted by silver nanoparticles (AgNPs). The proposed approach combines the structuring and oxidation of the Ti surface and the synthesis of AgNPs in a one-step process, without the use of additional chemicals or a complex apparatus. Such a process is easy to implement, versatile and sustainable compared to alternative methodologies capable of obtaining comparable results. Antimicrobial surfaces on medical devices (e.g., surgical tools or implants), for which titanium is widely used, can be realized due to the simultaneous presence of AgNPs and micro/nano-structured surface topography. The processed surfaces were examined by means of a scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM) and Raman spectroscopy. The surface morphology and the oxidation, quality and quantity of AgNPs were analyzed in relation to process parameters (laser scanning speed and AgNO3 concentration), as well as the effect of AgNPs on the Raman signal of Titanium oxide.

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Harnessing nano oil reservoir network for generating low friction and wear in self-mating alumina

et al. 2021

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Versatile micro- and nanotexturing techniques for antibacterial applications

Cited by 8 publications

References 184 publications

Sewage Water-Repellent PDMS and Magnetic Silicone Composites: Lab to Commercialization

Sewage Water-Repellent PDMS and Magnetic Silicone Composites: Lab to Commercialization

Single-Step Process for Titanium Surface Micro- and Nano-Structuring and In Situ Silver Nanoparticles Formation by Ultra-Short Laser Patterning

Harnessing nano oil reservoir network for generating low friction and wear in self-mating alumina

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