Molecular Organization of the Nanoscale Surface Structures of the Dragonfly Hemianax papuensis Wing Epicuticle

Ivanova, Elena P.; Nguyen, Song Ha; Webb, Hayden K.; Hasan, Jafar; Truong, Vi Khanh; Lamb, Robert N.; Duan, Xiaofei; Tobin, Mark J.; Mahon, Peter J.; Crawford, Russell J.

doi:10.1371/journal.pone.0067893

Cited by 66 publications

(69 citation statements)

References 75 publications

(68 reference statements)

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“…The presence of C H stretching bands with a prevalence of methylene bands is an indication of the presence of long-chain aliphatic hydrocarbons. This is consistent with previous reports that highlighted the presence of cuticular waxes on the surface of dragonfly wings [26,27]. It can therefore be concluded that the key components of the Odonata wings are similar for all wing samples tested, highlighting that these have not essentially changed over the past 40 years.…”

Section: Surface Chemistrysupporting

confidence: 92%

“…Previously published work has revealed that the fundamental components of the cuticular layer of dragonfly wings consists of peptide linked structural protein, chitin components that comprise the bulk of the wing membrane [26], and waxy components including long chain aliphatic hydrocarbons (C 14 -C 30 ) together with some carboxylic acids (palmitic acid and stearic acid). These components make up the outermost layer of the insect wing epicuticle [27]. These components contribute to not only the superhydrophobicity of the wing, but also to the hierarchical structure of the wing, which has been found to impart bactericidal properties to some wing surfaces [28].…”

Section: Introductionmentioning

confidence: 99%

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Wing wettability of Odonata species as a function of quantity of epicuticular waxes

Nguyen

Webb

Hasan

et al. 2014

Vibrational Spectroscopy

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Section: Surface Chemistrysupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Wing wettability of Odonata species as a function of quantity of epicuticular waxes

Nguyen

Webb

Hasan

et al. 2014

Vibrational Spectroscopy

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“…22,23 In follow-up studies, the nanopillars on the dragonfly wing were found to kill Gram-positive bacteria as well as yeast. 24,25 Similar nanopillars found on specially treated silicon wafers (black silicon) 26 had similar effects. According to these researchers, bacterial cells are killed on contact as they stretch over the pillars.…”

Section: Introductionmentioning

confidence: 62%

“…Such smaller, sharper nanopillars found on dragonfly wings and on black silicon have also been proven effective in killing Gram-positive bacteria and yeast cells. 24,26 …”

Section: B Nanotopographical Effects On Cell Morphologymentioning

confidence: 99%

Nanopatterned polymer surfaces with bactericidal properties

Dickson¹,

Liang²,

Rodríguez³

et al. 2015

Biointerphases

240

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Bacteria that adhere to the surfaces of implanted medical devices can cause catastrophic infection. Since chemical modifications of materials' surfaces have poor long-term performance in preventing bacterial buildup, approaches using bactericidal physical surface topography have been investigated. The authors used Nanoimprint Lithography was used to fabricate a library of biomimetic nanopillars on the surfaces of poly(methyl methacrylate) (PMMA) films. After incubation of Escherichia coli (E. coli) on the structured PMMA surfaces, pillared surfaces were found to have lower densities of adherent cells compared to flat films (67%-91% of densities on flat films). Moreover, of the E. coli that did adhere a greater fraction of them were dead on pillared surfaces (16%-141% higher dead fraction than on flat films). Smaller more closely spaced nanopillars had better performance. The smallest most closely spaced nanopillars were found to reduce the bacterial load in contaminated aqueous suspensions by 50% over a 24-h period compared to flat controls. Through quantitative analysis of cell orientation data, it was determined that the minimum threshold for optimal nanopillar spacing is between 130 and 380 nm. Measurements of bacterial cell length indicate that nanopillars adversely affect E. coli morphology, eliciting a filamentous response. Taken together, this work shows that imprinted polymer nanostructures with precisely defined geometries can kill bacteria without any chemical modifications. These results effectively translate bactericidal nanopillar topographies to PMMA, an important polymer used for medical devices.

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“…This discovery drew more attention to the design and application of surface topography for antimicrobial purposes. In addition to cicada wings, dragonfly wings (nanowires) 169,170 and gecko feet (nano-scale spinule arrays with a submicron spacing) 171 also possess similar functions to kill bacteria. Reprinted with permission from reference 168.…”

Section: Surface Patterns In Naturementioning

confidence: 99%

Exploring Novel Polymer Coatings for Antimicrobial Applications

Chen¹

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The ideal remedy to resist bacterial contamination on surfaces is to avoid the initial attachment of bacteria. The combination of the advances of polymer science and the requirement for long-lasting sterilisation of surfaces gave birth to antimicrobial polymer coatings, which provide an effective approach to preventing the initial attachment of bacteria through biocidal or antibiofouling functions.To meet the requirements of biomedical applications, antimicrobial polymer coatings still need refinements on the basis of the interaction between bacteria and the materials. Concurrently, interdisciplinary studies have inspired novel designs of polymer coatings through introducing ordered patterns to improve their antimicrobial performance. These two points are the foundations of this thesis to explore three novel polymer coating systems focusing on their antimicrobial performance, i.e. antibiofouling, biocidal, and combined functionalities through surface patterning.For antibiofouling purposes, fluorinated polymers have been insufficiently used compared to superhydrophilic and zwitterionic polymer coatings, despite proven effective against the contamination by particles, proteins and marine organisms. It is worthwhile investigating the feasibility and efficacy of fluorinated polymers as antibiofouling materials. In Chapters 2 and 3, block and statistical copolymers of partly-fluorinated methacrylate monomer, 1H,1H-heptafluorobutyl methacrylate (HFBMA) and methyl methacrylate (MMA) were prepared and fabricated into thin films. Through thermal annealing, the migration of the HFBMA repeating units at the air-polymer interface diminished surface free energy. The decrease in surface energy was consistent with the increase of the composition of HFBMA, while the block copolymers showed a more efficient reduction in surface energy compared to statistical copolymers due to phase separation. Subsequently, the antibiofouling performance of the films against S. aureus and E. coli were examined, where stronger and more constant antibiofouling behaviour was observed for block copolymer coatings with higher compositions of HFBMA.The combination of antibiofouling and biocidal functionalities potentially enhances the efficacy of coatings. Coatings with surface patterning such as line/trench topographies in micro-scale are effective against the formation of biofilms. As one of novel designs, coatings with micro-scale pores in honeycomb patterns and their antimicrobial behaviour were systematically studied in Chapters 4 and 5. The honeycomb patterns were introduced to polystyrene-block-poly(4-vinlylpyridine) (PS-b-P4VP) through "breath figures" method. The influences of different casting and chemical parameters on the size and regularity of the patterns were investigated, through which honeycomb-patterned films ii with a range of pore sizes were fabricated for subsequent biological tests. In the meantime, biocidal function was integrated into the honeycomb-patterned film by quaternising the P4VP blocks. The antibiofouling activ...

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Molecular Organization of the Nanoscale Surface Structures of the Dragonfly Hemianax papuensis Wing Epicuticle

Cited by 66 publications

References 75 publications

Wing wettability of Odonata species as a function of quantity of epicuticular waxes

Wing wettability of Odonata species as a function of quantity of epicuticular waxes

Nanopatterned polymer surfaces with bactericidal properties

Exploring Novel Polymer Coatings for Antimicrobial Applications

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