Abstract:Bacterial cells are lysed when they attach onto regularly arrayed silicon nanopillars. Following cell lysis, the cell debris detaches from the surface and is released back into the immediate environment which allows for restored bactericidal activity of the substratum.
“…This result is shown in Table 1 . This needle-size dependence of mechano-bactericidal performance is consistent with the results of earlier studies for the solid surface 7 , 9 , 11 , 17 , 22 . Figure 5 Relationship between the crystal size of acicular aragonite and bactericidal performance.…”
Section: Resultssupporting
confidence: 92%
“…It was recently revealed that the surfaces of dragonflies, cicada wings, and the skins of gecko’s feature nanoneedle structures that show antibacterial activity 1 – 6 . Reported artificial reproductions of these biomimetic structures, demonstrate similar antibacterial activity, known as the mechano-bactericidal effect 7 – 17 . Studies are steadily elucidating these mechano-bactericidal mechanisms.…”
Nanoneedle structures on dragonfly and cicada wing surfaces or black silicon nanoneedles demonstrate antibacterial phenomena, namely mechano-bactericidal action. These air-exposed, mechano-bactericidal surfaces serve to destroy adherent bacteria, but their bactericidal action in the water is no precedent to report. Calcium carbonate easily accumulates on solid surfaces during long-term exposure to hard water. We expect that aragonite nanoneedles, in particular, which grow on TiO2 during the photocatalytic treatment of calcium-rich groundwater, exhibit mechano-bactericidal action against bacteria in water. Here, we showed that acicular aragonite modified on TiO2 ceramics prepared from calcium bicarbonate in mineral water by photocatalysis exhibits mechanical bactericidal activity against E. coli in water. Unmodified, calcite-modified and aragonite-modified TiO2 ceramics were exposed to water containing E. coli (in a petri dish), and their bactericidal action over time was investigated under static and agitated conditions. The surfaces of the materials were observed by scanning electron microscopy, and the live/dead bacterial cells were observed by confocal laser scanning microscopy. As a result, the synergistic bactericidal performance achieved by mechano-bactericidal action and photocatalysis was demonstrated. Aragonite itself has a high biological affinity for the human body different from the other whisker-sharpen nanomaterials, therefore, the mechano-bactericidal action of acicular aragonite in water is expected to inform the development of safe water purification systems for use in developing countries.
“…This result is shown in Table 1 . This needle-size dependence of mechano-bactericidal performance is consistent with the results of earlier studies for the solid surface 7 , 9 , 11 , 17 , 22 . Figure 5 Relationship between the crystal size of acicular aragonite and bactericidal performance.…”
Section: Resultssupporting
confidence: 92%
“…It was recently revealed that the surfaces of dragonflies, cicada wings, and the skins of gecko’s feature nanoneedle structures that show antibacterial activity 1 – 6 . Reported artificial reproductions of these biomimetic structures, demonstrate similar antibacterial activity, known as the mechano-bactericidal effect 7 – 17 . Studies are steadily elucidating these mechano-bactericidal mechanisms.…”
Nanoneedle structures on dragonfly and cicada wing surfaces or black silicon nanoneedles demonstrate antibacterial phenomena, namely mechano-bactericidal action. These air-exposed, mechano-bactericidal surfaces serve to destroy adherent bacteria, but their bactericidal action in the water is no precedent to report. Calcium carbonate easily accumulates on solid surfaces during long-term exposure to hard water. We expect that aragonite nanoneedles, in particular, which grow on TiO2 during the photocatalytic treatment of calcium-rich groundwater, exhibit mechano-bactericidal action against bacteria in water. Here, we showed that acicular aragonite modified on TiO2 ceramics prepared from calcium bicarbonate in mineral water by photocatalysis exhibits mechanical bactericidal activity against E. coli in water. Unmodified, calcite-modified and aragonite-modified TiO2 ceramics were exposed to water containing E. coli (in a petri dish), and their bactericidal action over time was investigated under static and agitated conditions. The surfaces of the materials were observed by scanning electron microscopy, and the live/dead bacterial cells were observed by confocal laser scanning microscopy. As a result, the synergistic bactericidal performance achieved by mechano-bactericidal action and photocatalysis was demonstrated. Aragonite itself has a high biological affinity for the human body different from the other whisker-sharpen nanomaterials, therefore, the mechano-bactericidal action of acicular aragonite in water is expected to inform the development of safe water purification systems for use in developing countries.
“…That is, the mechano-bactericidal action of acicular aragonite characterized by small needles with a length and diameter of 1-2 and 0.05-0.1 µm, respectively, is high; while that of acicular aragonite characterized by larger needles with a length and diameter of 2-6 and 0.2-0.6 µm, respectively, is low. This needle-size dependence of mechano-bactericidal performance is consistent with the results of earlier studies for the gas-sold phase 7,9,11,17,21 .…”
Section: Resultssupporting
confidence: 91%
“…It was recently revealed that the surfaces of dragon ies, cicada wings, and the skins of geckos feature nanoneedle structures that show antibacterial activity [1][2][3][4][5][6] . Reported arti cial reproductions of these structures, biomimetic structures, demonstrate similar antibacterial activity, known as the mechanobactericidal effect [7][8][9][10][11][12][13][14][15][16][17] . Studies are steadily elucidating these mechano-bactericidal mechanisms.…”
Nanoneedle structures on dragonfly and cicada wing surfaces or black silicon nanoneedles demonstrate antibacterial phenomena, namely mechano-bactericidal action. These air-exposed, mechano-bactericidal surfaces serve to destroy adherent bacteria, but their bactericidal action in the water is no precedent to report. Calcium carbonate easily accumulates on surfaces during long-term exposure to hard water. We expect that aragonite nanoneedles, in particular, which grow on TiO2 during the photocatalytic treatment of calcium-rich groundwater, exhibit mechano-bactericidal action against bacteria in water. Here, we show that aragonite nanoneedles are grown on TiO2 ceramics from the calcium bicarbonate in mineral water exhibit mechano-bactericidal action against E. coli K-12 in water. Unmodified, calcite-modified as references and aragonite-modified TiO2 ceramics were exposed to water containing E. coli K-12 (in a petri dish), and their bactericidal action over time was investigated under static and agitated conditions. The surfaces of the materials were observed by scanning electron microscopy, and the live/dead bacterial cells were observed by confocal laser scanning microscopy. Further, the synergistic bactericidal performance achieved by mechano-bactericidal action and photocatalysis was demonstrated. Aragonite itself has a high biological affinity for the human body different from the other whisker-sharpen nano-materials, therefore, the mechano-bactericidal action of acicular aragonite in water is expected to inform the development of safe water purification systems for use in developing countries.
“…Nevertheless, the lethality of the nano-pillar arrays can be largely compromised or even deprived due to the accumulated dead bacteria and debris, which may even serve as nutrients in the subsequent bacterial proliferation [22,23]. Consequently, it is hard to obtain a long-term antibacterial surface only relying on the mechano-killing capability.…”
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