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Nanomaterials
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Nano and Submicro Surface Modifications That Modulate Bacterial Growth
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Nano and Submicro Surface Modifications That Modulate Bacterial Growth

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 7786

Special Issue Editor

Prof. Dr. Kamil Kaminski

E-Mail Website
Guest Editor
Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
Interests: modified polysaccharides; bioactive polycations; heparin; natural polymers

Special Issue Information

Dear Colleagues,

Heterogeneous surfaces, especially those with pores on the nanometer and submicrometer scale, affect the growth of microorganisms differently compared to homogeneous surfaces made of the same materials. There is a popular belief among scientists that nano surfaces have potential as antibacterial and bacteriostatic materials. Inverse situations where the growth of microorganisms favors rough (nano and submicrometer) surfaces compared to atomically smooth are less common but also observed. This fact shows that our knowledge of this phenomenon is still incomplete and describing it systematically would give us a powerful tool to control the microbes in our surroundings. This is of great importance due to the role of biofilms in bacterial infections and the production of chemicals using microbes (e.g., lactic acid and dextran). In this case, studying less-described phenomena, i.e., growth stimulation, may reveal new information to help understand the broader perspective.

This Special Issue welcomes the submission of original research works, as well as reviews, dealing with the modification of bacterial growth by well-characterized and defined surfaces. Topics should focus on correlating surface topology and the nature of growth modification. Works showing any effects related to pro-growth stimulation and less-common observations in the scientific literature are particularly welcome.

Prof. Dr. Kamil Kaminski
Guest Editor

Manuscript Submission Information

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Keywords

  • antibacterial surfaces
  • probacterial surface
  • bacterial biofilm
  • modification of growth
  • characterization
  • nano surface
  • submicron surface

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Published Papers (4 papers)

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Research

13 pages, 3123 KiB  
Article
Nano-AgCu Alloy on Wood Surface for Mold Resistance
by Yanran Qi, Xiaohan Dai, Lianxiang Wei, Hongxue Luo, Yiliang Liu, Xiaoying Dong, Dequan Yang and Yongfeng Li
Nanomaterials 2022, 12(7), 1192; https://doi.org/10.3390/nano12071192 - 2 Apr 2022
Cited by 7 | Viewed by 2463
Abstract
The mold infection of wood reduces the quality of its surface and potentially endangers human health. One category of the most popular mold inhibitors on the market is water-soluble fungicides. However, easy leaching due to ionic forms is a problem, which reduces the [...] Read more.
The mold infection of wood reduces the quality of its surface and potentially endangers human health. One category of the most popular mold inhibitors on the market is water-soluble fungicides. However, easy leaching due to ionic forms is a problem, which reduces the effectiveness of their antimicrobial action, as well as causing environmental pollution. Interestingly, nanometer-sized sterilizing agents present strong permeability and highly fungicidal behavior, and they are not easily leached, due to the unique nanoscale effect, and they have become alternative candidates as marketable anti-mold agents for wood protection. In this study, we first designed and explored a nanoscale alloy (nano silver–copper alloy, nano-AgCu) to treat wood surfaces for mold growth resistance. The results showed that three molds, i.e., Aspergillus niger, Penicillium citrinum and Trichoderma viride, mainly grew on the surface of wood within a depth of 100 μm; and that the nano-AgCu alloy with a particle size of ~15 nm presented improved retention and anti-mold efficiency at a nanomaterial concentration on the wood surface. Its leaching rate increased non-linearly with the increase in nano-AgCu retention and then it showed a gradually decreasing trend. When the concentration reached 1000 mg/L, the nano-AgCu alloy uniformly distributed on the wood surface in a monodispersed state and exhibited a lower retention of 0.342 g/m2, with an anti-mold efficiency of more than 75% and a leaching rate of only 7.678%. Such results positioned 1000 mg/L as the toxic threshold concentration of nano-AgCu against the three molds. This study can provide a scientific basis for the analysis of the anti-mold mechanisms of nano-AgCu alloy on wood surfaces and guide the application of nano-metal alloy materials in the field of wood antimicrobials. Full article
(This article belongs to the Special Issue Nano and Submicro Surface Modifications That Modulate Bacterial Growth)
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11 pages, 1536 KiB  
Article
Synthesis and Investigation of Antibacterial Activity of Thin Films Based on TiO2-Ag and SiO2-Ag with Potential Applications in Medical Environment
by Cristina-Ș. Adochițe, Cătălin Vițelaru, Anca C. Parau, Adrian E. Kiss, Iulian Pană, Alina Vlădescu, Sarah Costinaș, Marius Moga, Radu Muntean, Mihaela Badea and Mihaela Idomir
Nanomaterials 2022, 12(6), 902; https://doi.org/10.3390/nano12060902 - 9 Mar 2022
Cited by 16 | Viewed by 2914
Abstract
Multiple antibiotic resistance has now become a major obstacle to the treatment of infectious diseases. In this context, the application of nanotechnology in medicine is a promising alternative for the prevention of infections with multidrug-resistant germs. The use of silver as a powerful [...] Read more.
Multiple antibiotic resistance has now become a major obstacle to the treatment of infectious diseases. In this context, the application of nanotechnology in medicine is a promising alternative for the prevention of infections with multidrug-resistant germs. The use of silver as a powerful antibacterial agent has attracted much interest. TiO2 and SiO2 thin films enhanced with Ag particles have been developed with the aim of maintaining the transparency of the polymer films. Antibacterial activity was evaluated for a Gram-negative species-Escherichia coli-in concentrations of 105 and 104 CFU/mL in different conditions-activation by UV irradiation, single layer and double layer. Increased antibacterial efficacy of TiO2-deposited foil was found for the tests that had been exposed to UV activation. In the case of bilayer tests, the efficiency was higher compared to those in a single layer, as the contact surface between the films and the bacterial suspension increased. Films can be used as a potential method to limit bacterial growth on hospital surfaces, such as telephone screens and medical equipment, given their optimized characteristics and proven antibacterial efficacy. Full article
(This article belongs to the Special Issue Nano and Submicro Surface Modifications That Modulate Bacterial Growth)
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23 pages, 2922 KiB  
Article
Effects of Nanopillar Size and Spacing on Mechanical Perturbation and Bactericidal Killing Efficiency
by Amar Velic, Alka Jaggessar, Tuquabo Tesfamichael, Zhiyong Li and Prasad K. D. V. Yarlagadda
Nanomaterials 2021, 11(10), 2472; https://doi.org/10.3390/nano11102472 - 22 Sep 2021
Cited by 15 | Viewed by 2662
Abstract
Nanopatterned surfaces administer antibacterial activity through contact-induced mechanical stresses and strains, which can be modulated by changing the nanopattern’s radius, spacing and height. However, due to conflicting recommendations throughout the theoretical literature with poor agreement to reported experimental trends, it remains unclear whether [...] Read more.
Nanopatterned surfaces administer antibacterial activity through contact-induced mechanical stresses and strains, which can be modulated by changing the nanopattern’s radius, spacing and height. However, due to conflicting recommendations throughout the theoretical literature with poor agreement to reported experimental trends, it remains unclear whether these key dimensions—particularly radius and spacing—should be increased or decreased to maximize bactericidal efficiency. It is shown here that a potential failure of biophysical models lies in neglecting any out-of-plane effects of nanopattern contact. To highlight this, stresses induced by a nanopattern were studied via an analytical model based on minimization of strain and adhesion energy. The in-plane (areal) and out-of-plane (contact pressure) stresses at equilibrium were derived, as well as a combined stress (von Mises), which comprises both. Contour plots were produced to illustrate which nanopatterns elicited the highest stresses over all combinations of tip radius between 0 and 100 nm and center spacing between 0 and 200 nm. Considering both the in-plane and out-of-plane stresses drastically transformed the contour plots from those when only in-plane stress was evaluated, clearly favoring small tipped, tightly packed nanopatterns. In addition, the effect of changes to radius and spacing in terms of the combined stress showed the best qualitative agreement with previous reported trends in killing efficiency. Together, the results affirm that the killing efficiency of a nanopattern can be maximized by simultaneous reduction in tip radius and increase in nanopattern packing ratio (i.e., radius/spacing). These findings provide a guide for the design of highly bactericidal nanopatterned surfaces. Full article
(This article belongs to the Special Issue Nano and Submicro Surface Modifications That Modulate Bacterial Growth)
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16 pages, 4975 KiB  
Article
Growth of Lactic Acid Bacteria on Gold—Influence of Surface Roughness and Chemical Composition
by Joanna Grudzień, Magdalena Jarosz, Kamil Kamiński, Mirosława Kobasa, Karol Wolski, Marcin Kozieł, Marcin Pisarek and Grzegorz D. Sulka
Nanomaterials 2020, 10(12), 2499; https://doi.org/10.3390/nano10122499 - 13 Dec 2020
Cited by 6 | Viewed by 2660
Abstract
The main focus of this work was to establish a correlation between surface topography and chemistry and surface colonization by lactic acid bacteria. For this reason, we chose gold substrates with different surface architectures (i.e., smooth and nanorough) that were characterized by atomic [...] Read more.
The main focus of this work was to establish a correlation between surface topography and chemistry and surface colonization by lactic acid bacteria. For this reason, we chose gold substrates with different surface architectures (i.e., smooth and nanorough) that were characterized by atomic force microscopy (AFM), electron scanning microscopy (SEM), and X-ray diffractometry (XRD). Moreover, to enhance biocompatibility, we modified gold substrates with polymeric monolayers, namely cationic dextran derivatives with different molar masses. The presence of those layers was confirmed by AFM, infrared spectroscopy (IR), and X-ray photoelectron spectroscopy (XPS). In order to determine the adhesion abilities of non-modified and modified gold surfaces, we tested three lactic acid bacteria (LAB) strains (i.e., Lactobacillus rhamnosus GG, Lactobacillus acidophilus, and Lactobacillus plantarum 299v). We have shown that surface roughness influences the surface colonization of bacteria, and the most significant impact on the growth was observed for the Lactobacillus rhamnosus GG strain. What is more, covering the gold surface with a molecular polymeric film by using the layer-by-layer (LbL) method allows additional changes in the bacterial growth, independently on the used strain. The well-being of the bacteria cells on tested surfaces was confirmed by using selective staining and fluorescence microscopy. Finally, we have determined the bacterial metabolic activity by measuring the amount of produced lactic acid regarding the growth conditions. The obtained results proved that the adhesion of bacteria to the metallic surface depends on the chemistry and topography of the surface, as well as the specific bacteria strain. Full article
(This article belongs to the Special Issue Nano and Submicro Surface Modifications That Modulate Bacterial Growth)
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