Structural, optical, morphological and thermal properties of PEO/PVP blend containing different concentrations of biosynthesized Au nanoparticles

Abdelrazek, E.M.; Abdelghany, A.M.; Badr, S.I.; Morsi, M.A.

doi:10.1016/j.jmrt.2017.06.009

Cited by 223 publications

(94 citation statements)

References 42 publications

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“…The significant enhancement of the signal at 1000 cm −1 (due to ring breathing and asymmetric stretching vibration of CH 2 in the skeletal chain of PI, TCA, and biomolecules from plant extract) reveals that the CH 2 chain is close to the surface of AgNPs. The results of our SERS analysis are in agreement with previous reports and discussions above [102][103][104][105][106]. The nanocolloidal sample Cinn-AgNP-PI is SERS-inactive ( Figure 9d).…”

Section: Discussionsupporting

confidence: 92%

“…The XRD analysis of the nanocompounds TCA-AgNPs-PI and Cinn-AgNPs-PI indicated both amorphous and crystalline regions [101]. Surfaced-enhanced Raman scattering (SERS) is a method used to characterize the nature of chemical bonds formed on the surface of the metal and the molecular conformation on the specific metal films [102][103][104][105]. In SERS measurements, molecular vibrations perpendicular to the surface should be greater in the spectra, while those parallel to the surface should be deteriorated [102][103][104][105].…”

Section: Discussionmentioning

confidence: 99%

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“Smart” Antimicrobial Nanocomplexes with Potential to Decrease Surgical Site Infections (SSI)

et al. 2020

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The emergence of resistant pathogens is a burden on mankind and threatens the existence of our species. Natural and plant-derived antimicrobial agents need to be developed in the race against antibiotic resistance. Nanotechnology is a promising approach with a variety of products. Biosynthesized silver nanoparticles (AgNP) have good antimicrobial activity. We prepared AgNPs with trans-cinnamic acid (TCA) and povidone-iodine (PI) with increased antimicrobial activity. We synthesized also AgNPs with natural cinnamon bark extract (Cinn) in combination with PI and coated biodegradable Polyglycolic Acid (PGA) sutures with the new materials separately. These compounds (TCA-AgNP, TCA-AgNP-PI, Cinn-AgNP, and Cinn-AgNP-PI) and their dip-coated PGA sutures were tested against 10 reference strains of microorganisms and five antibiotics by zone inhibition with disc-and agar-well-diffusion methods. The new compounds TCA-AgNP-PI and Cinn-AgNP-PI are broad spectrum microbicidal agents and therefore potential coating materials for sutures to prevent Surgical Site Infections (SSI). TCA-AgNP-PI inhibits the studied pathogens stronger than Cinn-AgNP-PI in-vitro and on coated sutures. Dynamic light scattering (DLS), ultraviolet-visible spectroscopy (UV-Vis), Fourier Transform infrared spectroscopy (FT-IR), Raman, X-ray diffraction (XRD), microstructural analysis by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) confirmed the composition of TCA-AgNP-PI and Cinn-AgNP-PI. Smart solutions involving hybrid materials based on synergistic antimicrobial action have promising future perspectives to combat resistant microorganisms.Pharmaceutics 2020, 12, 361 2 of 36 20,000 related deaths in the United States in 2017 only and remains to be one of the important infection-associated mortality reasons [11,12]. The formation of biofilms on biotic and abiotic surfaces [13] paved the way for biofilm antibiotic tolerance as another major health threat [14,15]. This additional problem hampers the treatment of infections, most often gives rise to chronic infections, in the worst case to therapeutic failure, severe morbidity, and mortality [4]. More than 80% of microbial infections are caused by microbial biofilm formation and pose a severe health risk because treatment with antibiotics remains ineffective [16]. The incidence of chronic wound infections is increasing globally to alarming levels [17]. Chronic wounds are marked by high bacterial colonization and infection rates, which can be treated only by novel therapeutic approaches other than the use of conventional antibiotics [18,19]. Chronic wound tissues can contain microbiomes of complex communities with coexisting fungal and bacterial colonies of different strains within biofilms [20]. According to this inter-kingdom model, fungi like Candida albicans can offer structures for other bacteria (S. aureus, P. aeruginosa, Streptococcus spp., E. faecalis, E. coli, and Acinetobacter baumannii etc.) to attach, form intricate biofilms, and increase the resistance against any ...

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

“Smart” Antimicrobial Nanocomplexes with Potential to Decrease Surgical Site Infections (SSI)

et al. 2020

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“…These results are in covenant with the X-ray diffraction measurements and may be claried in terms of the creation of charge transfer complexes (CTCs) between the atom of gold nanoparticles and the polyethylene oxide/sodium alginate functional groups. 26…”

Section: Uv/vis Spectroscopymentioning

confidence: 99%

Optical and dielectric characteristics of polyethylene oxide/sodium alginate-modified gold nanocomposites

2020

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“…Two factors that govern the new identity of polymer systems are the type of dopants and their concentrations [ 29 ]. For example, the addition of metals, semiconductor particles, slats and metal complexes can manipulate both optical and electrical properties [ 21 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review on Optical Properties of Polymer Electrolytes and Composites

et al. 2020

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Polymer electrolytes and composites have prevailed in the high performance and mobile marketplace during recent years. Polymer-based solid electrolytes possess the benefits of low flammability, excellent flexibility, good thermal stability, as well as higher safety. Several researchers have paid attention to the optical properties of polymer electrolytes and their composites. In the present review paper, first, the characteristics, fundamentals, advantages and principles of various types of polymer electrolytes were discussed. Afterward, the characteristics and performance of various polymer hosts on the basis of specific essential and newly published works were described. New developments in various approaches to investigate the optical properties of polymer electrolytes were emphasized. The last part of the review devoted to the optical band gap study using two methods: Tauc’s model and optical dielectric loss parameter. Based on recently published literature sufficient quantum mechanical backgrounds were provided to support the applicability of the optical dielectric loss parameter for the band gap study. In this review paper, it was demonstrated that both Tauc’s model and optical dielectric loss should be studied to specify the type of electron transition and estimate the optical band gap accurately. Other parameters such as absorption coefficient, refractive index and optical dielectric constant were also explored.

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Structural, optical, morphological and thermal properties of PEO/PVP blend containing different concentrations of biosynthesized Au nanoparticles

Cited by 223 publications

References 42 publications

“Smart” Antimicrobial Nanocomplexes with Potential to Decrease Surgical Site Infections (SSI)

“Smart” Antimicrobial Nanocomplexes with Potential to Decrease Surgical Site Infections (SSI)

Optical and dielectric characteristics of polyethylene oxide/sodium alginate-modified gold nanocomposites

A Comprehensive Review on Optical Properties of Polymer Electrolytes and Composites

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