Abstract:Development of environmentally friendly and natural-based products with healing properties has become a popular trend for human health. Here, for the first time as far as known, we reported an efficient antibacterial composite nanofiber which was functionalized with the herbal extract of Satureja hortensis (SH) via electrospinning technique for wound care dressing applications. The plant which was used for this purpose is cultivated on a commercial scale in our country, Turkey, and it is relatively inexpensive… Show more
“…4 a, the graph shows the main characteristic bands for PVDF at 840 cm −1 for CH 2 rocking, C–C and CF 2 stretching, 1175 and 1400 cm −1 for C-F, and C-H vibrations, respectively 43 – 45 . While the characteristic bands of TPU appeared at 1533, 1735, 2971, 3365 cm −1 corresponding to –CONH– asymmetrical bond, C=O, C–H, and N–H stretching, respectively 46 , 47 . The resultant data in Fig.…”
Interest in piezoelectric nanocomposites has been vastly growing in the energy harvesting field. They are applied in wearable electronics, mechanical actuators, and electromechanical membranes. In this research work, nanocomposite membranes of different blend ratios from PVDF and TPU have been synthesized. The PVDF is responsible for piezoelectric performance where it is one of the promising polymeric organic materials containing β-sheets, to convert applied mechanical stress into electric voltage. In addition, the TPU is widely used in the plastic industry due to its superior elasticity. Our work investigates the piezoresponse analysis for different blending ratios of PVDF/TPU. It has been found that TPU blending ratios of 15–17.5% give higher output voltage at different stresses conditions along with higher piezosensitivity. Then, TPU addition with its superior mechanical elasticity can partially compensate PVDF to enhance the piezoelectric response of the PVDF/TPU nanocomposite mats. This work can help reducing the amount of added PVDF in piezoelectric membranes with enhanced piezo sensitivity and mechanical elasticity.
“…4 a, the graph shows the main characteristic bands for PVDF at 840 cm −1 for CH 2 rocking, C–C and CF 2 stretching, 1175 and 1400 cm −1 for C-F, and C-H vibrations, respectively 43 – 45 . While the characteristic bands of TPU appeared at 1533, 1735, 2971, 3365 cm −1 corresponding to –CONH– asymmetrical bond, C=O, C–H, and N–H stretching, respectively 46 , 47 . The resultant data in Fig.…”
Interest in piezoelectric nanocomposites has been vastly growing in the energy harvesting field. They are applied in wearable electronics, mechanical actuators, and electromechanical membranes. In this research work, nanocomposite membranes of different blend ratios from PVDF and TPU have been synthesized. The PVDF is responsible for piezoelectric performance where it is one of the promising polymeric organic materials containing β-sheets, to convert applied mechanical stress into electric voltage. In addition, the TPU is widely used in the plastic industry due to its superior elasticity. Our work investigates the piezoresponse analysis for different blending ratios of PVDF/TPU. It has been found that TPU blending ratios of 15–17.5% give higher output voltage at different stresses conditions along with higher piezosensitivity. Then, TPU addition with its superior mechanical elasticity can partially compensate PVDF to enhance the piezoelectric response of the PVDF/TPU nanocomposite mats. This work can help reducing the amount of added PVDF in piezoelectric membranes with enhanced piezo sensitivity and mechanical elasticity.
“…As seen the barrier effect of TPU to release SH extract to the environment was higher than that of SEBS in the case for S. aureus , therefore SEBS composite nanofibers demonstrated higher antibacterial activity. In addition to that, in our previous studies, we have observed different interactions between a variety of polymers and plants extracts in which we applied plants extract to indicate as natural antibacterial agents in order to use in biomedical applications …”
Section: Resultsmentioning
confidence: 87%
“…The first aim of this study was to obtain nanofibers by the electrospinning technique from the SEBS triblock copolymer and functionalize these fibers with natural agents. In line with this goal, the Satureja hortensis ( SH ) plant extract, which has bioactive properties against Gram‐negative and Gram‐positive pathogens was used as a natural agent . As a result, antibacterial SEBS triblock copolymer composite nanofiber mats were obtained.…”
Among the thermoplastic elastomers that play important roles in the polymer industry due to their superior properties, styrene‐based species and polyurethane block copolymers are of great interest. Poly(styrene‐ethylene‐butadiene‐styrene) (SEBS) as a triblock copolymer seems to have the potential to meet many demands in different applications due to various industrial requirements where durability, biocompatibility, breaking elongation, and interfacial adhesion are important. In this study, the SEBS triblock copolymer was functionalized with natural (Satureja hortensis, SH) and synthetic (nanopowder, TiO2) agents to obtain composite nanofibers by electrospinning and electrospraying methods for use in biomedical and water filtration applications. The results were compared with thermoplastic polyurethane (TPU) composite nanofibers, which are commonly used in these fields. Here, functionalized SEBS nanofibers exhibited antibacterial effect while at the same time improving cell viability. In addition, because of successful water filtration by using the SEBS composite nanofibers, the material may have a good potential to be used comparably to TPU for the application.
“…5 , the characteristic bands of PVDF appeared at 840 cm −1 corresponding to the rocking of CH 2 , C–C, and CF 2 stretching, in addition to 1175 cm −1 for C–F and 1400 cm −1 for C–H vibrations 78 – 80 . Nevertheless, the main characteristic bands for TPU were observed at 3365, 2971, 1735, and 1533 cm −1 , corresponding to N–H stretching, C–H, C = O, and CONH– asymmetrical bond, respectively 81 , 82 . The β-phase fraction was calculated as shown in Table 1 , through the following equation: Figure 5 FT-IR analysis of PVDF and PVDF/TPU (85:15) nanofibers.…”
This paper introduces a new approach of testing piezoelectric nanofibers as antibacterial mat. In this work, both Polyvinylidene fluoride (PVDF) and PVDF embedded with thermoplastic polyurethane nanofibers are synthesized as nanofibers mat via electrospinning technique. Then, such mat is analyzed as piezoelectric material to generate electric voltage under different mechanical excitations. Furthermore, morphological and chemical characteristics have been operated to prove the existence of beta sheets piezoelectricity of the synthesized nanofibers mats. Then, the synthesized nanofibers surfaces have been cyclically stretched and exposed to bacteria specimen. It has been noticed that the generated voltage and the corresponding localized electric field positively affect the growth of bacteria and reduces the formation of K. penomenue samples bacteria colonies. In addition, the effect of both stretching frequency and pulses numbers have been studied on the bacteria count, growth kinetics, and protein leakage. Our contribution here is to introduce an innovative way of the direct impact of the generated electric field from piezoelectric nanofibers on the reduction of bacteria growth, without depending on traditional anti-bacterial nanoparticles. This work can open a new trend of the usability of piezoelectric nanofibers through masks, filters, and wound curing mats within anti-bacterial biological applications.
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