scholarly journals Fabrication and characterization of electrospun poly(e-caprolactone) fibrous membrane with antibacterial functionality

2017 ◽  
Vol 4 (2) ◽  
pp. 160911 ◽  
Author(s):  
Idris Cerkez ◽  
Ayse Sezer ◽  
Sukhwinder K. Bhullar
Keyword(s):  
Research Study ◽  
Silver Chloride ◽  
Antibacterial Properties ◽  
Mechanical Analysis ◽  
Fibrous Membrane ◽  
Gram Positive Bacteria ◽  
Lower Strain ◽  
Reinforcing Agent ◽  
Fabrication And Characterization

This research study is mainly targeted on fabrication and characterization of antibacterial poly(e-caprolactone) (PCL) based fibrous membrane containing silver chloride particles. Micro/nano fibres were produced by electrospinning and characterized with TGA, DSC, SEM and mechanical analysis. It was found that addition of silver particles slightly reduced onset of thermal degradation and increased crystallization temperature of neat PCL. Silver-loaded samples exhibited higher tensile stress and lower strain revealing that the particles behaved as reinforcing agent. Moreover, addition of silver chloride resulted in beaded surface texture and formation of finer fibres as opposed to the neat. Antibacterial properties were tested against Gram-negative and Gram-positive bacteria and remarkable biocidal functionalities were obtained with about six logs reduction of Staphylococcus aureus and Escherichia coli O157:H7.

scholarly journals NOVEL COMPOSITE OF SILVER-BACTERIAL CELLULOSE (Ag-BC) FROM SIWALAN SAP (Borassus flabellifer) AND ITS ANTIBACTERIAL ACTIVITY

2020 ◽  
Vol 83 (1) ◽  
pp. 19-25
Author(s):  
Suntini Suntini ◽  
Anastasia Wheni Indrianingsih ◽  
Harjono Harjono
Keyword(s):  
Antibacterial Activity ◽  
Bacterial Cellulose ◽  
Antibacterial Properties ◽  
Reduction Process ◽  
Diffusion Method ◽  
Natural Material ◽  
Gram Positive Bacteria ◽  
Antibacterial Assay ◽  
Natural Composite

Recently, a wound healing from natural composite with excellent properties is in a high demand. In this study, a novel composite of bacterial cellulose made from Siwalan sap (Borassus flabellifer) was achieved. Siwalan is a common plant in Java Island of Indonesia and the application is very limited for beverage only. This study aims to determine the effect of the AgNO3/NaBH4 concentration ratio in the development of Ag-BC composites and its antibacterial properties from Siwalan sap. Ag-BC composites were prepared by impregnating the silver solution into the BC matrix through the reduction process with NaBH4. Characterization of Ag-BC composites conducted using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray (EDX). Antibacterial assay was performed using disc diffusion method against Salmonella typhimurium (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria. The characterization of Ag-BC composite shows the nanostructure of BC with a length of fiber around 35-60 nm in width. The SEM-EDX micrograph showed that silver particles were impregnated into the BC matrix. Antibacterial activity test results showed that the Ag-BC composite had the ability to inhibit the bacteria S. typhimurium and S. aureus with good inhibition. This result showed the potential application of Ag-BC composite from Siwalan plant as a natural material for medical and pharmaceutical purpose, especially as an antibacterial agent.

Fabrication and characterization of silk fibroin powder/polyurethane fibrous membrane

2012 ◽  
Vol 52 (9) ◽  
pp. 2025-2032 ◽  
Author(s):  
Zikui Bai ◽  
Weilin Xu ◽  
Jie Xu ◽  
Hongjun Yang ◽  
Shili Xiao ◽  
...  
Keyword(s):  
Silk Fibroin ◽  
Fibrous Membrane ◽  
Fabrication And Characterization

scholarly journals Preparation of polyaniline-polyvinyl alcohol-silver nanocomposite and characterization of its mechanical and antibacterial properties

2018 ◽  
Vol 25 (5) ◽  
pp. 975-982 ◽  
Author(s):  
Alireza Khoshkbar Sadeghi ◽  
Maryam Farbodi
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Polyvinyl Alcohol ◽  
Nanocomposite Film ◽  
Antibacterial Properties ◽  
Composition And Structure ◽  
Reinforcing Agent ◽  
Silver Nanocomposite ◽  
Thermal Stability Of

AbstractIn the present research, polyaniline is used as a conducting polymer and polyvinyl alcohol is also used as a biopolymer, because of its mechanical properties and suitable processability. Also, silver nanoparticles are considered as a reinforcing agent of thermal stability, mechanical and antibacterial properties to prepare polyaniline-polyvinyl alcohol-silver nanocomposite. The synthesis of polyaniline-polyvinyl alcohol composite and polyaniline-polyvinyl alcohol-silver nanocomposite is performed through addition of polyaniline and silver in polyvinyl alcohol solution. In order to review thermal, mechanical and antibacterial properties of synthesized composite and nanocomposites, components with different weight rates are used. The obtained results from thermogravimetric analysis (TGA) tests also indicate promotion of thermal stability of polyaniline-polyvinyl alcohol-silver nanocomposite compared with pure polyvinyl alcohol in temperatures above 400°C. The results of Fourier-transform infrared (FTIR) spectroscopy revealed the presence of polyaniline, polyvinyl alcohol and silver in the structure of polyaniline-polyvinyl alcohol-silver triple nanocomposite film. The obtained results from a review of antibacterial properties showed that polyaniline-polyvinyl alcohol-silver nanocomposites have antibacterial effects on two different types of Gram-positive and Gram-negative bacteria. The obtained results from a review of mechanical properties of nanocomposites showed that the greatest value of tensile strength (13.8 MPa) belonged to polyaniline-polyvinyl alcohol-silver (88%/9%/3% w/w) nanocomposites. Therefore, this is determined as an optimal triple nanocomposite. In addition, scanning electron microscopy (SEM) coupled with an energy dispersive X-ray (EDX) system was used to characterize the composition and structure of polyaniline-polyvinyl alcohol-silver nanocomposite film.

Fabrication and Characterization of the Recycling of Composite Palm Materials, Shell, Leaves and Branches in Saudi Arabia

2019 ◽  
Author(s):  
Khaled Alhummidy G. Almotery ◽  
Waleed Saeed M. Alsaiari ◽  
Yazeed Abdulrahman Y. Alyoussef ◽  
Mohammad Farraj M. Alsahli ◽  
Meshal Mohammed O. Alharbi ◽  
...  
Keyword(s):  
Composite Materials ◽  
Xrd Analysis ◽  
Mechanical Analysis ◽  
Spectroscopy Analysis ◽  
Recycled Materials ◽  
The World ◽  
Fabrication And Characterization ◽  
Positive Results ◽  
Recycled Material

Abstract Palm wood can be classified into three categories: leaves, branches and core-shell, and all of these were studied. Recycled composite materials are promising in the innovation field since some microstructures have unique characterization and noble applications. The micro mill used grinded the recycled materials into micro size particles approximately 20μm. SEM + EDX spectroscopy was used to analyze and indicate the morphology of the micro particle composite material’s composition content. The SEM results demonstrate the composite homogeneity. XRD analysis was conducted and showed the structural properties of the recycled composite materials examined. The recycled material was transferred into micro size particles encased by the properties of resin mixed with epoxy, this led to promising composite materials. FITR spectroscopy analysis revealed a distinct interaction between the polymer chain and the band positions. The mechanical analysis was conducted based on the recycled materials’ application. The mechanical properties were observed during the tests and reflected in the structure of the material and its uses. This project aimed to determine the possibility of efficiently recycling composite. The significant increase in demand around the world, and the increased use of composite materials in different industries, has consequently led to positive results for the production waste.

scholarly journals Characterization of an Antioxidant and Antimicrobial Extract from Cool Climate, White Grape Marc

Antioxidants ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 232 ◽  
Author(s):  
Kenneth J. Olejar ◽  
Arianna Ricci ◽  
Simon Swift ◽  
Zoran Zujovic ◽  
Keith C. Gordon ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Agricultural Waste ◽  
Antibacterial Properties ◽  
Total Phenolic ◽  
Gram Positive Bacteria ◽  
Winery Waste ◽  
And Staphylococcus Aureus ◽  
Spectral Assessment ◽  
Cool Climate

Valorization of agricultural waste has become increasingly important. Wastes generated by wineries are high in phenolic compounds with antioxidant and antibacterial properties, which contribute to phytotoxicity, making their immediate use for agricultural means limited. Utilizing a water-based extraction method, the phenolic compounds from winery waste were extracted and purified. The resulting extract was characterized for phenolic composition using high-pressure liquid chromatography-ultraviolet/visible and electrochemical detectors (HPLC-UV/Vis, ECD) for monomers, and spectral assessment of the tannins present using attenuated total reflectance- Fourier transform infrared (ATR-FTIR), FT-Raman, and solid-state nuclear magnetic resonance (SSNMR) spectroscopies. The extract’s antioxidant activity was assessed by the scavenging of the 2,2-diphenyl-1–picrylhydrazyl (DPPH) radical and Folin-Ciocalteu total phenolic assay, and was found to be as effective as a commercially obtained grape extract. The extract’s antimicrobial efficacy was tested for minimum bactericidal concentration using Candida albicans, Escherichia coli 25922, and Staphylococcus aureus 6538, which resulted in greater efficacy against gram-positive bacteria as shown over gram-negative bacteria, which can be linked to both monomeric and tannin polyphenols, which have multiple modes of bactericidal action.

Light-cured dental composites characterization by Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 428-429
Author(s):  
B. M. Culbertson ◽  
M. L. Devinev ◽  
E. C. Kao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Analysis ◽  
Service Performance ◽  
Dental Composite ◽  
Dental Composites ◽  
Neat Resin ◽  
Scanning Calorimetry ◽  
Research Meeting ◽  
Formulation Variables

The service performance of current dental composite materials, such as anterior and posterior restoratives and/or veneer cements, needs to be improved. As part of a comprehensive effort to find ways to improve such materials, we have launched a broad spectrum study of the physicochemical and mechanical properties of photopolymerizable or visible light cured (VLC) dental composites. The commercially available VLC materials being studied are shown in Table 1. A generic or neat resin VLC system is also being characterized by SEM and TEM, to more fully understand formulation variables and their effects on properties.At a recent dental research meeting, we reported on the differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) characterization of the materials in Table 1. It was shown by DSC and DMA that the materials are substantially undercured by commonly used VLC techniques. Post curing in an oral cavity or a dry environment at 37 to 50°C for 7 or more hours substantially enhances the cure of the materials.

Fabrication and Characterization of Polyoxometalate based Nano-hybrids: Evaluation of their role in Biological Activity

2019 ◽  
Vol 35 (4) ◽  
pp. 475-484
Author(s):  
SHIVA ARUN ◽  
◽  
PRABHA BHARTIYA ◽  
AMREEN NAZ ◽  
SUDHEER RAI ◽  
...  
Keyword(s):  
Biological Activity ◽  
Fabrication And Characterization
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