scholarly journals Improving the Antimicrobial and Mechanical Properties of Epoxy Resins via Nanomodification: An Overview

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5426
Author(s):  
Roberta Bertani ◽  
Alessandra Bartolozzi ◽  
Alessandro Pontefisso ◽  
Marino Quaresimin ◽  
Michele Zappalorto
Keyword(s):  
Mechanical Properties ◽  
Antimicrobial Activity ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Comprehensive Overview ◽  
Anticorrosion Coatings ◽  
Bacteria And Fungi ◽  
Dental Applications

The main purpose of this work is to provide a comprehensive overview on the preparation of multifunctional epoxies, with improved antimicrobial activity and enhanced mechanical properties through nanomodification. In the first section, we focus on the approaches to achieve antimicrobial activity, as well as on the methods used to evaluate their efficacy against bacteria and fungi. Relevant application examples are also discussed, with particular reference to antifouling and anticorrosion coatings for marine environments, dental applications, antimicrobial fibers and fabrics, and others. Subsequently, we discuss the mechanical behaviors of nanomodified epoxies with improved antimicrobial properties, analyzing the typical damage mechanisms leading to the significant toughening effect of nanomodification. Some examples of mechanical properties of nanomodified polymers are provided. Eventually, the possibility of achieving, at the same time, antimicrobial and mechanical improvement capabilities by nanomodification with nanoclay is discussed, with reference to both nanomodified epoxies and glass/epoxy composite laminates. According to the literature, a nanomodified epoxy can successfully exhibit antibacterial properties, while increasing its fracture toughness, even though its tensile strength may decrease. As for laminates—obtaining antibacterial properties is not followed by improved interlaminar properties.

scholarly journals Evaluating the Antimicrobial Activity of Commercially Available Herbal Toothpastes on Microorganisms Associated with Diabetes Mellitus

2013 ◽  
Vol 14 (5) ◽  
pp. 924-929 ◽  
Author(s):  
Reena Kulshrestha ◽  
J Kranthi ◽  
P Krishna Rao ◽  
Feroz Jenner ◽  
V Abdul Jaleel ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Antimicrobial Activity ◽  
Dental Health ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Test Organism ◽  
Diffusion Method ◽  
Zone Of Inhibition ◽  
Disk Diffusion Method

ABSTRACT Aim The present study was conducted to evaluate the efficacy of commercially available herbal toothpastes against the different periodontopathogens. Materials and methods Six herbal toothpastes that were commonly commercially available were included in the study. Colgate herbal, Babool, Meswak, Neem active, Dabur red toothpastes were tested for the study whereas sterile normal saline was used as control. Antimicrobial efficacies of dentifrices were evaluated against Streptococcus mutans and Actinobacillus actinomycetemcomitans. The antimicrobial properties of dentifrices were tested by measuring the maximum zone of inhibition at 24 hours on the Mueller Hinton Agar media inoculated with microbial strain using disk diffusion method. Each dentifrice was tested at 100% concentration (full strength). Results The study showed that all dentifrices selected for the study were effective against the entire test organism but to varying degree. Neem active tooth paste gave a reading of 25.4 mm as the zone of inhibition which was highest amongst all of the test dentifrices. Colgate Herbal and Meswak dentifrices recorded a larger maximum zone of inhibition, measuring 23 and 22.6 mm respectively, compared to other toothpastes. All other dentifrices showed the zone of inhibition to be between 17 and 19 mm respectively. Conclusion The antibacterial properties of six dentifrices were studied in vitro and concluded that almost all of the dentifrices available commercially had antibacterial properties to some extent to benefit dental health or antiplaque action. How to cite this article Jenner F, Jaleel VA, Kulshrestha R, Maheswar G, Rao PK, Kranthi J. Evaluating the Antimicrobial Activity of Commercially Available Herbal Toothpastes on Microorganisms Associated with Diabetes Mellitus. J Contemp Dent Pract 2013;14(5):924-929.

scholarly journals Antibacterial Effects of Oak Fruit, Jaft, and Jaftex Herbal Mouthwash: A Review

2019 ◽  
Author(s):  
Maria Cheraghi ◽  
Fatemeh Babadi
Keyword(s):  
Antimicrobial Activity ◽  
Pathogenic Bacteria ◽  
Web Of Science ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Antibiotic Sensitivity ◽  
Antibacterial Activities ◽  
Antibacterial Effects ◽  
Digital Literature ◽  
Review Study

Abstract Recently, natural products have been evaluated as a source of antimicrobial agent with efficacies against a variety of microorganisms. The antibacterial activities of the oak fruit,inner husk of oak fruit (Jaft), and Jaftex mouthwash have been studiedin several studies. Thisstudy aimedto review the studies ofthe effects of antibacterial properties of the oak fruit, oak fruit hull (Jaft), and Jaftex mouthwash. Materials and Methods In this review study, relevant articles related to the antimicrobial activity of the oak fruit, inner husk of oak fruit (Jaft), and 'Jaftex mouthwash' were searched from the current digital literature using electronic databases namely, SID, ScienceDirect, PubMed, Google Scholar, Magiran, Web of Science employing the same keywords from 1990 to 2019. Results Oakfruit, inner husk of oak fruit (Jaft), and Jaftex mouthwash have antimicrobial properties against many microorganisms. Discussion and Conclusion Antibacterial properties of oak fruit, inner husk ofoak fruit (Jaft) can be used to reverse the antibiotic sensitivity against pathogenic bacteria. Jaftex is recommended as an antibacterial and anti-plaque mouthwash.

scholarly journals Mechanical Properties and Tensile Fatigue of Graphene Nanoplatelets Reinforced Polymer Nanocomposites

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Ming-Yuan Shen ◽  
Tung-Yu Chang ◽  
Tsung-Han Hsieh ◽  
Yi-Luen Li ◽  
Chin-Lung Chiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fatigue Life ◽  
Carbon Fiber ◽  
Ultimate Tensile Strength ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Fiber Composite ◽  
Graphene Nanoplatelets ◽  
Carbon Fiber Composite

Graphene nanoplatelets (GNPs) are novel nanofillers possessing attractive characteristics, including robust compatibility with most polymers, high absolute strength, and cost effectiveness. In this study, GNPs were used to reinforce epoxy composite and epoxy/carbon fiber composite laminates to enhance their mechanical properties. The mechanical properties of GNPs/epoxy nanocomposite, such as ultimate tensile strength and flexure properties, were investigated. The fatigue life of epoxy/carbon fiber composite laminate with GPs-added 0.25 wt% was increased over that of neat laminates at all levels of cyclic stress. Consequently, significant improvement in the mechanical properties of ultimate tensile strength, flexure, and fatigue life was attained for these epoxy resin composites and carbon fiber-reinforced epoxy composite laminates.

scholarly journals Antimicrobial Materials with Lime Oil and a Poly(3-hydroxyalkanoate) Produced via Valorisation of Sugar Cane Molasses

2020 ◽  
Vol 11 (2) ◽  
pp. 24
Author(s):  
Pooja Basnett ◽  
Elena Marcello ◽  
Barbara Lukasiewicz ◽  
Rinat Nigmatullin ◽  
Alexandra Paxinou ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Chain Length ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Carbon Substrate ◽  
Medium Chain ◽  
Medium Chain Length ◽  
Antimicrobial Materials ◽  
Dry Cell Weight ◽  
One Year

A medium chain-length polyhydroxyalkanoate (PHA) was produced by Pseudomonas mendocina CH50 using a cheap carbon substrate, sugarcane molasses. A PHA yield of 14.2% dry cell weight was achieved. Chemical analysis confirmed that the polymer produced was a medium chain-length PHA, a copolymer of 3-hydroxyoctanoate and 3-hydroxydecanoate, P(3HO-co-3HD). Lime oil, an essential oil with known antimicrobial activity, was used as an additive to P(3HO-co-3HD) to confer antibacterial properties to this biodegradable polymer. The incorporation of lime oil induced a slight decrease in crystallinity of P(3HO-co-3HD) films. The antibacterial properties of lime oil were investigated using ISO 20776 against Staphylococcus aureus 6538P and Escherichia coli 8739, showing a higher activity against the Gram-positive bacteria. The higher activity of the oil against S. aureus 6538P defined the higher efficiency of loaded polymer films against this strain. The effect of storage on the antimicrobial properties of the loaded films was investigated. After one-year storage, the content of lime oil in the films decreased, causing a reduction of the antimicrobial activity of the materials produced. However, the films still possessed antibacterial activity against S. aureus 6538P.

scholarly journals Synergetic Effects of Mechanical Properties on Graphene Nanoplatelet and Multiwalled Carbon Nanotube Hybrids Reinforced Epoxy/Carbon Fiber Composites

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Pin-Ning Wang ◽  
Tsung-Han Hsieh ◽  
Chin-Lung Chiang ◽  
Ming-Yuan Shen
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Fiber Composite ◽  
Synergetic Effect ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Multiwalled Carbon

Graphene nanoplatelets (GNPs) and carbon nanotubes (CNTs) are novel nanofillers possessing attractive characteristics, including robust compatibility with most polymers, high absolute strength, and cost effectiveness. In this study, an outstanding synergetic effect on the grapheme nanoplatelets (GNPs) and multiwalled carbon nanotubes (CNTs) hybrids were used to reinforce epoxy composite and epoxy/carbon fiber composite laminates to enhance their mechanical properties. The mechanical properties of CNTs/GNPs hybrids on a fixed weight fraction (1 wt%) with mixing different ratio reinforced epoxy nanocomposite, such as ultimate tensile strength and flexure properties, were investigated. The mechanical properties of epoxy/carbon fiber composite laminates containing different proportions of CNTs/GNPs hybrids (0.5, 1.0, 1.5 wt%) were increased over that of neat laminates. Consequently, significant improvement in the mechanical properties was attained for these epoxy resin composites and carbon fiber-reinforced epoxy composite laminates.

scholarly journals Antimicrobial Properties of Water-Soluble Polysaccharides and Alcoholic Extracts of Laetiporus Sulphureus (Bull.) Murrill Mycelium and Development of Biotechnology for Its Production in Immobilized Culture on Bacterial Cellulose

2020 ◽  
Vol 65 (1-2) ◽  
pp. 10-14
Author(s):  
I. A. Gavryushina ◽  
T. I. Gromovykh ◽  
N. B. Feldman ◽  
S. V. Lutsenko ◽  
V. I. Ponomarenko ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Bacterial Cellulose ◽  
Synthetic Medium ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Water Soluble ◽  
Biologically Active ◽  
Aqueous Extracts ◽  
Gram Positive Bacteria ◽  
Immobilized Culture

The article discusses the development of a new method of producing Laetiporus sulphureus (Bull.) Murrill basidiomycete mycelium immobilized on a bacterial cellulose matrix. Mycelium contains biologically active compounds with antimicrobial activity against Gram-positive bacteria, including resistant staphylococcus. The aim of the work was to obtain immobilized mycelium by co-cultivation of L.sulphureus with the producer of bacterial cellulose Gluconacetobacter hansenii. The authors found that when co-culturing the basidial L.sulphureus strain with the bacterial cellulose producing G.hansenii strain, productivity increases by 3.2 times on H5/1 synthetic medium and by 1.9 times on natural Maltax-10 medium (concentration 5%). The resulting immobilized L.sulphureus mycelium has antibacterial properties; its aqueous extracts contain glucans.

scholarly journals Novel Antibacterial and Toughened Carbon-Fibre/Epoxy Composites by the Incorporation of TiO2 Nanoparticles Modified Electrospun Nanofibre Veils

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1524 ◽  
Author(s):  
Cristina Monteserín ◽  
Miren Blanco ◽  
Nieves Murillo ◽  
Ana Pérez-Márquez ◽  
Jon Maudes ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Tio2 Nanoparticles ◽  
Epoxy Composite ◽  
Antibacterial Properties ◽  
Polyamide 6 ◽  
Flexural Stress ◽  
Mechanical Reinforcement ◽  
Single Structure ◽  
Carbon Fiber Epoxy

The inclusion of electrospun nanofiber veils was revealed as an effective method for enhancing the mechanical properties of fiber-reinforced epoxy resin composites. These veils will eventually allow the incorporation of nanomaterials not only for mechanical reinforcement but also in multifunctional applications. Therefore, this paper investigates the effect of electrospun nanofibrous veils made of polyamide 6 modified with TiO2 nanoparticles on the mechanical properties of a carbon-fiber/epoxy composite. The nanofibers were included in the carbon-fiber/epoxy composite as a single structure. The effect of positioning these veils in different composite positions was investigated. Compared to the reference, the use of unmodified and TiO2 modified veils increased the flexural stress at failure and the fracture toughness of composites. When TiO2 modified veils were incorporated, new antibacterial properties were achieved due to the photocatalytic properties of the veils, widening the application area of these composites.

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