Investigation of Antibacterial Properties of Ag Doped TiO2 Nanofibers Prepared by Electrospinning Process

AbstractIn this study, undoped and 1, 2,3, 4, and 5 wt % Ag-doped TiO2 nanofibers have been fabricated by the electrospinning method applying 20 kV voltages at 8 cm height with a flow rate 0.1 mL/h. The antibacterial properties of undoped and doped Ag/TiO2 nanofibers were tested on Staphylococcus aureus bacteria. The antibacterial effect of these fabricated nanofibers has been determined by disc diffusion and Baird parker methods. The results have shown that Ag/TiO2 nanofibers have an excellent antibacterial effect on this bacterium compared to pure TiO2 nanofibers. As a result, developed nanofibers can easily be applied in various fields such as biomedical sector and tissue engineering. In addition, the chemical components, morphology, and crystal structure of the nanofibers have been performed by scanning electron microscopy energy dispersive analysis (SEM-EDX), differential thermal analysis/thermal gravimetric analysis (DTA/TG), and X-ray diffraction (XRD) methods.

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Carbonation Resistance of Surface Protective Materials Modified with Hybrid NanoSiO2

Coatings ◽

10.3390/coatings11030269 ◽

2021 ◽

Vol 11 (3) ◽

pp. 269

Author(s):

Kailun Xia ◽

Yue Gu ◽

Linhua Jiang ◽

Mingzhi Guo ◽

Lei Chen ◽

...

Keyword(s):

Construction Material ◽

Chemical Components ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

Carbonation Depth ◽

X Ray ◽

Carbonation Resistance ◽

Ideal Situation ◽

Caco3 Content ◽

Reference Samples

To date, reinforcement concrete is the main construction material worldwide. As the concentration of atmospheric CO2 is steadily increasing, carbonation of the reinforcement concrete becomes a pressing concern. In this study, novel surface protective materials (SPMs) modified with hybrid nanoSiO2 (HNS), fly ash, and slag were developed to reduce CO2 emissions and extend the service life of the reinforcement concrete. The carbonation depths were measured by phenolphthalein to reflect the carbonation resistance. X-ray diffraction (XRD), fourier-transform infrared spectroscopy (FTIR), and thermal gravimetric analysis (TGA) were conducted to analyze the chemical components of the samples after carbonation. In addition, MIP was carried out to examine the microstructures of the samples prior to carbonation. Thermodynamic modeling was employed to calculate the changes in the phase assemblages of each blends in an ideal situation. The experimental results showed that the carbonation depth and CaCO3 content of the SPM modified with HNS decreased by 79.0% and 64.6% compared with the reference, respectively. The TGA results showed that after carbonation, the CaCO3 contents were 4.40% and 12.42% in the HNS modified samples and reference samples, respectively. MIP analysis demonstrated that the incorporation of HNS in SPM led to a 48.3% and 58.5% decrease in big pores and capillary pores, respectively. Overall, the SPMs modified with HNS in this study possessed better carbonation resistance and refined pore structures.

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Effect of Calcinations on Morphology of Electrospun Copper and Copper Oxide Nanofibers

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.52-54.1884 ◽

2011 ◽

Vol 52-54 ◽

pp. 1884-1889 ◽

Cited By ~ 1

Author(s):

Dariush Jafar Khadem ◽

Zahira Yaakob ◽

Samaneh Shahgaldi ◽

Wan Ramli Wan Daud ◽

Edy Herianto Majlan

Keyword(s):

Electron Microscopy ◽

Copper Oxide ◽

Sol Gel ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Oxide Nanostructures ◽

Transmission Electron ◽

Electrospinning Method ◽

Potential Applications

Metal and Metal oxide nanofibers have different potential to play an essential role in a series of application, among them copper and copper oxide nanostructures is a promising semiconductor material with potential applications in many field. In this paper, electrospinning method via sol-gel was used to fabricate copper and copper oxide nanofibers. Synthesize of copper and copper oxide nanofibers and also effect of calcinations temperature on morphology investigated by thermal gravimetric analysis, scanning electron microscopy (SEM), Transmission electron microscopy, x-ray diffraction(XRD), Fourier transform infrared spectroscopy (FTIR) and Brunauer Emmett and Teller (BET).

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Synthesis and Characterization of MgFe2O4@MIL-53(Al) Nanocomposite as Antibacterial Drug Nanocarrier Agent

10.21203/rs.3.rs-819765/v1 ◽

2021 ◽

Author(s):

Fatemeh Shateran ◽

Mohammad Ali Ghasemzadeh

Keyword(s):

Antibacterial Properties ◽

Antibacterial Activities ◽

Antibacterial Drug ◽

Gravimetric Analysis ◽

Thermal Gravimetric ◽

X Ray Diffraction ◽

X Ray ◽

Metal Organic ◽

Ft Ir

Abstract Metal-organic frameworks (MOFs) are developing as a powerful platform for the delivery and controlled release of drugs. In this study, we reported a novel magnetic framework including MgFe2O4@MIL-53(Al) for the delivery of tetracycline (TC) antibiotic. The obtained results of this research showed that 88% of the TC was loaded on the MgFe2O4@MIL-53(Al). The drug release study was performed in pH: 7.4 and pH: 5.0 which showed 75% and 83% release within 3 days. Moreover, antibacterial activities tests based on well agar diffusion were performed against Staphylococcus aureus and Escherichia coli bacteria which exhibited satisfactory antibacterial properties of TC-loaded MgFe2O4@MIL-53(Al). Moreover, the prepared structures including MgFe2O4@MIL-53(Al) and MgFe2O4@MIL-53(Al)/TC were identified using Fourier-transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Scanning electron microscope (SEM) and thermal gravimetric analysis (TGA).

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The Silver-Loaded Diatomite Prepared by Ion Exchange and its Antibacterial Effect

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.744.311 ◽

2013 ◽

Vol 744 ◽

pp. 311-314

Author(s):

Chun Ping Wang ◽

Shao Ping Chen ◽

Jia Chao Chen

Keyword(s):

Ion Exchange ◽

Antibacterial Effect ◽

Antibacterial Properties ◽

Silver Ions ◽

Preparation Process ◽

X Ray Diffraction ◽

X Ray ◽

E Coli ◽

Good Antibacterial Activity ◽

Experiment Method

In order to optimize the preparation process of silver-loaded diatomite, the effect of the adsorption time, temperature and the concentration of silver nitrate on the content of silver ions in diatomite were investigated through ion exchange experiment method. And the antibacterial properties were measured by Haloes method. The samples were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The results show that the loading of the silver ions is no change in the microscopic structure of the diatomite, the silver exists in diatomite as the ion. The content of silver in the diatomite is 0.523g/g under the condition of AgNO3 (0.5mol/L) and temperature 70°C. The silver-loaded diatomite has good antibacterial activity on E. coli.

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A Superhydrophobic, Antibacterial, and Durable Surface of Poplar Wood

Nanomaterials ◽

10.3390/nano11081885 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1885

Author(s):

Xinyu Wu ◽

Feng Yang ◽

Jian Gan ◽

Zhangqian Kong ◽

Yan Wu

Keyword(s):

Stearic Acid ◽

Antibacterial Properties ◽

Alkali Resistance ◽

Poplar Wood ◽

X Ray Diffraction ◽

X Ray ◽

Different Temperatures ◽

Acid And Alkali Resistance ◽

The Stability

The silver particles were grown in situ on the surface of wood by the silver mirror method and modified with stearic acid to acquire a surface with superhydrophobic and antibacterial properties. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray energy spectroscopy (XPS) were used to analyze the reaction mechanism of the modification process. Scanning electron microscopy (SEM) and contact angle tests were used to characterize the wettability and surface morphology. A coating with a micro rough structure was successfully constructed by the modification of stearic acid, which imparted superhydrophobicity and antibacterial activity to poplar wood. The stability tests were performed to discuss the stability of its hydrophobic performance. The results showed that it has good mechanical properties, acid and alkali resistance, and UV stability. The durability tests demonstrated that the coating has the function of water resistance and fouling resistance and can maintain the stability of its hydrophobic properties under different temperatures of heat treatment.

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Rapid four-component synthesis of dihydropyrano[2,3-c]pyrazoles using nano-eggshell/Ti(IV) as a highly compatible natural based catalyst

BMC Chemistry ◽

10.1186/s13065-021-00734-5 ◽

2021 ◽

Vol 15 (1) ◽

Author(s):

Arefeh Dehghani Tafti ◽

Bi Bi Fatemeh Mirjalili ◽

Abdolhamid Bamoniri ◽

Naeimeh Salehi

Keyword(s):

Thermo Gravimetric Analysis ◽

Reaction Times ◽

Diffraction Field ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Solvent Free Conditions ◽

High Yields ◽

Work Up

AbstractNano-eggshell/Ti(IV) as a novel naturally based catalyst was prepared, characterized and applied for the synthesis of dihydropyrano[2,3-c]pyrazole derivatives. The characterization of nano-eggshell/Ti(IV) was performed using Fourier Transform Infrared spectroscopy, X-ray Diffraction, Field Emission Scanning Electron Microscopy, Energy-Dispersive X-ray Spectroscopy, and Thermo Gravimetric Analysis. Dihydropyrano[2,3-c]pyrazoles were synthesized in the presence of nano-eggshell/Ti(IV) via a four component reaction of aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate at room temperature under solvent free conditions. The principal affairs of this procedure are mild condition, short reaction times, easy work-up, high yields, reusability of the catalyst and the absence of toxic organic solvents.

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Enhanced Photocatalytic Activity of Cu2O Cabbage/RGO Nanocomposites under Visible Light Irradiation

Polymers ◽

10.3390/polym13111712 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1712

Author(s):

Appusamy Muthukrishnaraj ◽

Salma Ahmed Al-Zahrani ◽

Ahmed Al Otaibi ◽

Semmedu Selvaraj Kalaivani ◽

Ayyar Manikandan ◽

...

Keyword(s):

Electron Microscopy ◽

Thermo Gravimetric Analysis ◽

Visible Region ◽

Catalytic Performance ◽

Precipitation Method ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Dye Pollutants ◽

Transmission Electron

Towards the utilization of Cu2O nanomaterial for the degradation of industrial dye pollutants such as methylene blue and methyl orange, the graphene-incorporated Cu2O nanocomposites (GCC) were developed via a precipitation method. Using Hummers method, the grapheme oxide (GO) was initially synthesized. The varying weight percentages (1–4 wt %) of GO was incorporated along with the precipitation of Cu2O catalyst. Various characterization techniques such as Fourier-transform infra-red (FT-IR), X-ray diffraction (XRD), UV–visible diffused reflectance (UV-DRS), Raman spectroscopy, thermo gravimetric analysis (TGA), energy-dispersive X-ray analysis (EDX), and electro chemical impedance (EIS) were followed for characterization. The cabbage-like morphology of the developed Cu2O and its composites were ascertained from field-emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HR-TEM). In addition, the growth mechanism was also proposed. The results infer that 2 wt % GO-incorporated Cu2O composites shows the highest value of degradation efficiency (97.9% and 96.1%) for MB and MO at 160 and 220 min, respectively. Further, its catalytic performance over visible region (red shift) was also enhanced to an appreciable extent, when compared with that of other samples.

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Effect of Synthesis Temperature on Particles Size and Morphology of Zirconium Oxide Nanoparticle

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.50.18 ◽

2017 ◽

Vol 50 ◽

pp. 18-31 ◽

Cited By ~ 6

Author(s):

Rudzani Sigwadi ◽

Simon Dhlamini ◽

Touhami Mokrani ◽

Patrick Nonjola

Keyword(s):

Electron Microscopy ◽

Particle Size ◽

Zirconium Oxide ◽

Thermo Gravimetric Analysis ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Crystallite Sizes ◽

Ft Ir

The paper presents the synthesis and investigation of zirconium oxide (ZrO2) nanoparticles that were synthesised by precipitation method with the effects of the temperatures of reaction on the particles size, morphology, crystallite sizes and stability at high temperature. The reaction temperature effect on the particle size, morphology, crystallite sizes and stabilized a higher temperature (tetragonal and cubic) phases was studied. Thermal decomposition, band structure and functional groups were analyzed by Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), Thermo-gravimetric analysis (TGA) and Fourier transform infrared (FT-IR). The crystal structure was determined using X-ray diffraction. The morphology and the particle size were studied using (SEM) and (TEM). The shaped particles were confirmed through the SEM analysis. The transmission electron microscopic analysis confirmed the formation of the nanoparticles with the particle size. The FT-IR spectra showed the strong presence of ZrO2 nanoparticles.

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TiO2 nanofibers fabricated by electrospinning technique and degradation of MO dye under UV light

Zeitschrift für Kristallographie - Crystalline Materials ◽

10.1515/zkri-2021-2025 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Naveen Thakur ◽

Nikesh Thakur ◽

Viplove Bhullar ◽

Saurabh Sharma ◽

Aman Mahajan ◽

...

Keyword(s):

Raman Spectroscopy ◽

Fiber Diameter ◽

Uv Light ◽

Rutile Phase ◽

Powder Form ◽

X Ray Diffraction ◽

Electrospinning Technique ◽

Tio2 Nanofibers ◽

X Ray ◽

Uv Visible

Abstract Titanium dioxide (TiO2) nanofibers were synthesized by electrospinning to optimize the photocatalytic action efficiency. The synthesis of the fibers was carried out at four different wt% concentrations: 8, 9, 10 & 11% of polymer polyvinylpyrrolidone (PVP). The TiO2 fibers were further calcined at 700 °C to get powder form. The uncalcinated and calcined TiO2 nanofibers were characterized by using X-Ray diffraction (XRD), Raman spectroscopy, Scanning electron microscopy (SEM) and UV-Visible spectroscopy. Raman spectroscopy confirmed the rutile phase of the calcined TiO2nanofibers in powder form with a crystallite size of 34–38 nm. The surface morphology of the uncalcinated and calcined TiO2 nanofibers was examined by SEM and the fiber diameter found to be 360–540 nm. The optical bandgap of the calcined TiO2 nanofibers was found in the range of 3.29–3.24 eV. The photocatalytic activity of the TiO2 nanofibers as examined for uncalcinated and calcined nanofibers, methyl orange (MO) dye degraded up to 98 and 78%, respectively in 180 min under the exposure of UV light. Uncalcinated TiO2 nanofibers were found more suitable for degradation of MO dye as compared to calcined nanofibers.

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A Facile Method to Construct MXene/CuO Nanocomposite with Enhanced Catalytic Activity of CuO on Thermal Decomposition of Ammonium Perchlorate

Materials ◽

10.3390/ma11122457 ◽

2018 ◽

Vol 11 (12) ◽

pp. 2457 ◽

Cited By ~ 6

Author(s):

Haifeng Zhao ◽

Jing Lv ◽

Junshan Sang ◽

Li Zhu ◽

Peng Zheng ◽

...

Keyword(s):

Thermal Decomposition ◽

Catalytic Activity ◽

Ammonium Perchlorate ◽

Photoelectron Spectra ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

Scanning Calorimetry ◽

X Ray ◽

Improved Performance ◽

Calcination Method

In this work, a mixing-calcination method was developed to facilely construct MXene/CuO nanocomposite. CuO and MXene were first dispersed in ethanol with sufficient mixing. After solvent evaporation, the dried mixture was calcinated under argon to produce a MXene/CuO nanocomposite. As characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and X-ray photoelectron spectra (XPS), CuO nanoparticles (60–100 nm) were uniformly distributed on the surface and edge of MXene nanosheets. Furthermore, as evaluated by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA), the high-temperature decomposition (HTD) temperature decrease of ammonium perchlorate (AP) upon addition of 1 wt% CuO (hybridized with 1 wt% MXene) was comparable with that of 2 wt% CuO alone, suggesting an enhanced catalytic activity of CuO on thermal decomposition of AP upon hybridization with MXene nanosheets. This strategy could be further applied to construct other MXene/transition metal oxide (MXene/TMO) composites with improved performance for various applications.

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