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In the present work, we report the fabrication of silica nanoparticles embedded polymeric (SiO2 nanoparticles@polymer) composite films for numerous traits like texture, folding endurance, crystallinity, size, thermal behavior, spectral analysis, and bioactivity. Significant facets of bulky, inert, inorganic materials are known to burgeon out due to...
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Inorganic transparent conductive oxides have dominated the market as transparent electrodes due to their high conductivity and transparency. Here, we report the fabrication and optimization of the synthesis of poly(3,4-ethylenedioxythiophene) trifluoromethanesulfonate via vapor phase polymerization for the potential replacement of such inorganic ma...
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... Nowadays, the formulation of polymer-inorganic nanocomposite materials has been widely researched because of their interesting properties; they combine the features of organic and inorganic materials, generating new materials for different potential applications. These materials have the synergy of the flexibility and processability of the polymers with the optical and hydrophilic properties of the inorganic component, generating a compatible compound with both features [3]. ...
In this study, a novel binary nanocomposite system based on TiO2-SiO2 was functionalized with trimethylolpropane triacrylate (TMPTA) and characterized by XPS and XRD. Results revealed that TiO2-SiO2 nanoparticles were covalently functionalized. Functionalized nanoparticles at low concentrations (0.1 wt % and 0.5 wt %) were dispersed in acrylic acid acting as a polymer matrix. Nanocomposite coatings analysis demonstrate to achieve superhydrophilic properties as well as very good optical characteristics. Water contact angle characterization showed the functionalization effect by achieving a superhydrophilic behavior with a contact angle less than 5°. UV-Vis measurements demonstrated high optical transmittance above 95% for the coatings. Based on the obtained results a mechanism describing the chemical interactions of the constituents responsible for the synergy in the nanocomposite as well as the morphological play role in the behavior are presented.
... Nowadays, the formulation of polymer-inorganic nanocomposite materials has been widely researched because of their interesting properties; they combine the features of organic and inorganic materials, generating new materials for different potential applications. These materials have the synergy of the flexibility and processability of the polymers with the optical and hydrophilic properties of the inorganic component, generating a compatible compound with both features [3]. ...
In this study, a novel binary nanocomposite system based on TiO2-SiO2 was functionalized with trimethylolpropane triacrylate (TMPTA) and characterized by XPS and XRD. Results revealed that TiO2-SiO2 nanoparticles were covalently functionalized. Functionalized nanoparticles at low concentrations (0.1 wt% and 0.5 wt%) were dispersed in acrylic acid acting as a polymer matrix. Nanocomposite coatings analysis demonstrate to achieve superhydrophilic properties as well as very good optical characteristics. Water contact angle characterization showed the functionalization effect by achieving a superhydrophilic behavior with a contact angle less than 5°. UV-Vis measurements demonstrated high optical transmittance above 95% for the coatings. Based on the obtained results a mechanism describing the chemical interactions of the constituents responsible for the synergy in the nanocomposite as well as the morphological play role in the behavior are presented.
... The inorganic SiO 2 nanoparticles on hydration develop active sites to make bonds with the polymer as shown in Fig. 2 . The reactions between silanol group of SiO 2 (Si-OH), hydroxyl group (-OH) of acids (-COOH) and sugars present in the Gum Tragacanth result in mechano-chemical dehydration with the formation of tragacanth-SiO 2 nanocomposite [21,[30][31][32] . Table 1 represents characteristic bands present in Tragacanth-SiO 2 nanocomposite which show the peaks for Si-OH, Si-O -C and -Si-CH 2 -Si linkage, thus confirming the synthesis of the bio-polymer nanocomposite. ...
Present study discusses the development of a novel nano-composites using a natural polymer, Gum Tra-gacanth and inorganic silicon dioxide nanoparticles for its application in hydraulic fracturing. The structural and morphological characteristics of the developed fluids have been investigated using various analytical techniques like FTIR, Cryo-TEM, FE-SEM, AFM which indicated uniform dispersion of nanoparticles in polymer matrix. The steady and dynamic rheological and polymer breaking studies were carried out to evaluate its viscosity, gel breaking characteristics and proppant transportation capability. The rheol-ogy of the fluid studied under atmospheric and applied pressure at different temperatures showed improved stability of nanocomposite over polymer gel as well as its suitability to stimulate formation having a temperature higher than 175 °C. The tragacanth nanocomposite which is first time developed for hydraulic fracturing shows superior breaking characteristics, leaving much less residue than the conventionally used polymer in the industry, i.e. guar and its derivative, CMHPG. Shear thinning behavior and high elastic modulus of the developed fluid are favorable for efficient pumping and transportation of the proppants down to bottom hole as well as its placement in the fracture formation.
Amid the rise of antibiotic-resistant bacterial strains in human populations, novel solutions are necessary. Nanoparticles, renowned for their adaptability, offer a diverse range of research avenues, notably as antibacterial agents. Coupling antibiotics with nanoparticles stands out as a potential strategy, effectively intriguing drug delivery challenges and circumventing antibiotic resistance. This review focuses on studies of nanoparticles in conjugation with the aminoglycoside antibiotic gentamicin and their effectiveness as novel nanoparticle conjugates, their applications in drug delivery and enhanced bactericidal effects. In most cases, the nanoparticle conjugates were found to efficiently kill different bacterial strains, which was mainly dependent on the size, stability and concentration of the nanoparticles. Despite the several limitations such as nanotoxicity, accumulation of intravenously injected nanomaterials in tissues and organs, the urge and potential for the advancement of nanoparticle-drug conjugates still demands more scientific advancements.
Almond gum and varied concentrations of nanosilica (0.2, 0.4, 0.6, 0.8, and 1.0 wt%) were introduced into the chitosan polymer matrix by solution cast method to enrich the characteristics of the bionanocomposite film. The surface topography, thermal stability, crystalline nature, and functional moieties of the synthesized bionanocomposite films were characterized by SEM, TGA, XRD, and FT-IR. The UV–Vis spectrophotometer showed a maximum absorption wavelength for the film containing the highest concentration of nanosilica. Change in properties such as increased tensile strength, elongation and reduced water solubility, and swelling properties were observed for the bionanocomposite film containing 1.0 wt% nanosilica. In addition, the films exhibited excellent inhibition effect against Escherichia coli bacteria and Candida albicans fungus, which were proven by well diffusion assay method. The carrot slices packed in the bionanocomposite film containing the highest amount of nanosilica retained their freshness for a longer period of time, suggesting the film to be an effective and excellent food packaging material.
The production of highly porous and three-dimensional (3D) scaffolds with biomimicking abilities has gained extensive attention in recent years for tissue engineering (TE) applications. Considering the attractive and versatile biomedical functionality of silica (SiO2) nanomaterials, we propose herein the development and validation of SiO2-based 3D scaffolds for TE. This is the first report on the development of fibrous silica architectures, using tetraethyl orthosilicate (TEOS) and polyvinyl alcohol (PVA) during the self-assembly electrospinning (ES) processing (a layer of flat fibers must first be created in self-assembly electrospinning before fiber stacks can develop on the fiber mat). The compositional and microstructural characteristics of obtained fibrous materials were evaluated by complementary techniques, in both the pre-ES aging period and post-ES calcination. Then, in vivo evaluation confirmed their possible use as bioactive scaffolds in bone TE.
Antimicrobial resistance (AMR) is a ubiquitous public health menace. AMR emergence causes complications in treating infections contributing to an upsurge in the mortality rate. The epidemic of AMR in sync with a high utilization rate of antimicrobial drugs signifies an alarming situation for the fleet recovery of both animals and humans. The emergence of resistant species calls for new treatments and therapeutics. Current records propose that health drug dependency, veterinary medicine, agricultural application, and vaccination reluctance are the primary etymology of AMR gene emergence and spread. Recently, several encouraging avenues have been presented to contest resistance, such as antivirulent therapy, passive immunization, antimicrobial peptides, vaccines, phage therapy, and botanical and liposomal nanoparticles. Most of these therapies are used as cutting-edge methodologies to downplay antibacterial drugs to subdue the resistance pressure, which is a featured motive of discussion in this review article. AMR can fade away through the potential use of current cutting-edge therapeutics, advancement in antimicrobial susceptibility testing, new diagnostic testing, prompt clinical response, and probing of new pharmacodynamic properties of antimicrobials. It also needs to promote future research on contemporary methods to maintain host homeostasis after infections caused by AMR. Referable to the microbial ability to break resistance, there is a great ultimatum for using not only appropriate and advanced antimicrobial drugs but also other neoteric diverse cutting-edge therapeutics.
Nanoparticles have gained more interest in the biomedical research preferentially as antimicrobial agents due to their unique physiochemical property. Mounting evidence revealed the utilization of nanoparticles as an antimicrobial covering in implantable devices, as a diagnostic agent to detect microbial infection, and as a drug delivery system for targeted delivery of antibiotics. Nanoparticles engineered with antibiotics have received much interest due to their antimicrobial efficiency against multidrug-resistant microorganisms. Nanoparticles exhibit antimicrobial activity by damaging the bacterial cell by oxidative stress-mediated cell death, the release of the metal, and other nonoxidative mechanisms. However, the precise mechanism of nanoparticles is not yet completely elucidated. This chapter will be highlighting the literature survey regarding antimicrobial mechanism of various nanoparticles. Besides the synergic effect of nanoparticles and antibiotics against drug-resistant bacteria and biofilm formation, antifungal and antiviral properties will also be discussed. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
The main goal of the present paper was to synthesize the polyvinyl alcohol-SiO2 nanoparticles polymeric membrane by wet-phase inversion method. The efficiency of prepared membranes (without and with SiO2) was investigated using a versatile laboratory electrodialysis system filled with simulated wastewaters that contain zinc ions. All experiments were performed at following conditions: the applied voltage at electrodes of 5, 10 and 15 V, a concentration of zinc ions solution of 2 g L−1, time for each test of
1 h and at room temperature. The demineralization rate, extraction percentage of zinc ions, current efficiency and energy consumption were determined. The polymeric membranes were characterized by Fourier Transforms Infrared Spectroscopy-Attenuated Total Reflection (FTIR-ATR), Scanning Electron Microscopy (SEM) and Electrochemical Impedance Spectroscopy (EIS). The higher value of percentage removal of zinc ions (over 65%) was obtained for the polymeric membrane with SiO2 nanoparticles, at 15
V. The FTIR-ATR spectra show a characteristic peak located at ~1078 cm−1 assigned to the Si-O-Si asymmetrical stretching. SEM images of the polymeric membrane with SiO2 nanoparticles show that the nanoparticles and polymer matrix were well compatible. The impedance results indicated that the SiO2 nanoparticles induced the higher proton conductivity. The final polymeric membranes can be used for the removal of various metallic ions, dyes, organic or inorganic colloids, bacteria or other microorganisms
from different natural waters and wastewaters.
Poly(methyl methacrylate)/silica nanocomposites membranes were prepared by simple solution mixing method using three different solvents (acetone, acetonitrile and chloroform). The structure and thermal properties of these nanocomposites were investigated by fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and environmental scanning electron microscope (ESEM). The infrared spectra confirm that the strongest H-bond interaction between the PMMA and silica was found when using chloroform solvent. In the case of thermal properties, the DSC and TGA analyses show significant improvement in thermal stability and glass transition temperature (T g ). Furthermore, the ESEM micrographs prove the structure stability of these synthesized nanocomposites. The results demonstrate that the solvent that lead to form the strongest H-bond interaction between the PMMA carbonyl groups and silica silanol groups (as chloroform solvent) will be more efficient in the synthesis of PMMA/SiO 2 nanocomposites.
