Amany M. El Nahrawy

National Research Centre

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Electroconductive Composites Containing Nanocellulose, Nanopolypyrrole, and Silver Nanoparticles

JOURNAL OF RENEWABLE MATERIALS (2019)

Samir Kamel Ahmed A. Haroun Amany M. El Nahrawy Mohamed A. Diab

In this work, conducting composites of nanocellulose (NC)/polypyrrole nanoparticles (NPPy) and silver nanoparticles (AgNPs), i.e., NC/NPPyAg, were synthesized for the first time, to the best of our knowledge, via in situ emulsion polymerization of pyrrole in the presence of surfactant dopants. The AgNPs acted as an oxidizing agent to simultaneously incorporate nanoparticles into the prepared composites. The structures and morphologies of the prepared composites were studied using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), UV-Vis Spectra, thermogravimetric analysis (TGA), and scanning and transmission electron microscopy (SEM and TEM) techniques. Additionally, the prepared composites were characterized by their conductivities, and the dielectric constants (ε΄), dielectric losses (ε˝), and AC conductivities were studied for the prepared composites with an increasing NPPy content as a function of the frequency.

Thermogravimetric analysis

Nanocellulose

Polypyrrole

Oxidizing agent

Emulsion polymerization

Silver nanoparticle

In situ polymerization

10.32604/jrm.2019.00144

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Citations (16)

High performance of talented copper/magneso-zinc titanate nanostructures as biocidal agents for inactivation of pathogens during wastewater disinfection

Applied Nanoscience (2020)

Amany M. El Nahrawy Ahmed M. Bakr Ali B. Abou Hammad Bahaa A. Hemdan

Nanomaterials

Nanochemistry

10.1007/s13204-020-01454-3

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Citations (31)

Uniformly Embedded Cellulose/Polypyrrole-TiO2 Composite in Sol-Gel Sodium Silicate Nanoparticles: Structural and Dielectric Properties

Silicon (2018)

Amany M. El Nahrawy Ahmed A. Haroun Ali B. Abou Hammad Mohamed A. Diab Samir Kamel

Polypyrrole

High-κ dielectric

Dielectric loss

10.1007/s12633-018-9910-4

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Citations (27)

Conducting cellulose/TiO 2 composites by in situ polymerization of pyrrole

Carbohydrate Polymers (2017)

Amany M. El Nahrawy Ahmed A. Haroun Imad Hamadneh Ammar H. Al‐Dujaili Samir Kamel

Polypyrrole

Thermal Stability

Dielectric loss

In situ polymerization

Dissipation factor

10.1016/j.carbpol.2017.03.066

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Citations (43)

Sol–gel synthesis and physical characterization of novel MgCrO4-MgCu2O3 layered films and MgCrO4-MgCu2O3/p-Si based photodiode

Nano-Structures & Nano-Objects (2020)

A. M. Mansour Ali B. Abou Hammad Amany M. El Nahrawy

Photocurrent

Photodiode

Visible spectrum

10.1016/j.nanoso.2020.100646

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Citations (42)

Identification of Fe3+ co-doped zinc titanate mesostructures using dielectric and antimicrobial activities

International Journal of Environmental Science and Technology (2020)

Amany M. El Nahrawy Ahmed M. Bakr Bahaa A. Hemdan Ali B. Abou Hammad

Biocide

Dissipation factor

Aspergillus niger

10.1007/s13762-020-02786-x

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Citations (50)

Hybrid Chitosan/CaO-Based Nanocomposites Doped with Plant Extracts from Azadirachta indica and Melia azedarach: Evaluation of Antibacterial and Antibiofilm Activities

BioNanoScience (2022)

Tsvetelina Paunova‐Krasteva Bahaa A. Hemdan Petya D. Dimitrova Tsvetozara Damyanova Amal M. El‐Feky

Azadirachta

Melia azedarach

10.1007/s12668-022-01047-0

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Citations (22)

Cyanoethyl Cellulose/BaTiO₃/GO Flexible Films with Electroconductive Properties

ECS Journal of Solid State Science and Technology (2021)

Sawsan Dacrory Ali B. Abou Hammad Amany M. El Nahrawy Hussein Abou‐Yousef Samir Kamel

Indispensable modification of cellulose has been carried out to produce cyanoethyl cellulose (CEC) to overcome the obstacles of the direct use of cellulose as film form rather than enhancing its physicochemical properties. Barium titanate (BTO) and/or graphene oxide (GO) were used as fillers in the cyanoethyl cellulose matrix to form films of different composite, CEC/GO, CEC/BTO, and CEC/GO/BTO films. XRD and FTIR were used to confirm the composition of the composites. The effects of embedded mass fraction of BTO and/or GO on the thermal stability, mechanical properties, and dielectric properties of the prepared composite films were investigated. The diffuse reflectance spectra showed that the optical band gap energy of the prepared composites was increased from 0.922 eV to 1.003 eV with an indirect allowed type. Dielectric measurements were carried out over the wide range of 4 Hz to 8 MHz. The dielectric constant increased to 1505 at 100 Hz for CEC loaded with graphene oxide and barium titanate while the conductivity was increased to 1.03 * 10−3 S cm−1. These observations indicated that this kind of composite would be helpful in various industrial applications with high dielectric permittivity in the embedded capacitor field.

Barium titanate

Thermal Stability

Dielectric loss

10.1149/2162-8777/ac1c56

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Citations (34)

Adjusting the Effects of Cr³⁺ Doping on Structural, Dielectric, Antimicrobial Properties of Delafossite SrCuO₂ Nanoparticle

ECS Journal of Solid State Science and Technology (2024)

Abeer T. Talha T.M. Meaz Amany M. El Nahrawy

SrCu (1− x ) Cr x O 2 nanoparticles (x = 0.0, 0.6, 1.2, and 1.8) nanoparticles were synthesized using sol-gel processing and subjected to calcination at 650 °C. The investigation delved into the influence of varying chromium concentrations on the structural, FTIR, electrical, and antimicrobial characteristics. The microstructure of the SrCu (1− x ) Cr x O 2 nanoparticles (x = 0.0, 0.6, 1.2, and 1.8) nanoparticles were analyzed through X-ray diffraction and transmission electron microscopy. Additionally, changes in chemical bonds were observed as the Cr content increased. The dielectric parameters exhibit an increase with higher Cr ratios. Additionally, there is a decrease in these parameters as the frequency rises, which could be attributed to the mobility of charged particles within the SrCu (1− x ) Cr x O 2 nanostructure. Our investigation underscores the significant role of Cr incorporation in influencing both the dielectric properties and antimicrobial activity of Cr, emphasizing its relevance for diverse applications.

Delafossite

10.1149/2162-8777/ad2198

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Citations (1)

Dielectric and dynamic antibacterial investigations of organic–inorganic conductive membranes based on oxidized cellulose with BNKT nanoceramics

Cellulose (2023)

Ahmed I. Ali Bahaa A. Hemdan A. M. Mansour Ali B. Abou Hammad Samir Kamel

Abstract The development of eco-friendly materials for advanced applications is highly demanded. The current study focuses on the preparation of conductive membranes based on tricarboxylic cellulose (TCC) loaded with cubic bismuth sodium titanate (BNKT) nanoceramics. FTIR, SEM, and EDX analyses confirm the presence of loaded BNKT on the membranes. The electrical response of the cellulose/xBNKT (x = 5, 10, 15, and 20% wt/wt) membrane is investigated using impedance spectroscopy. The real part (Z′) and the imaginary part (Z″) of the complex impedance are studied as a function of frequency (4Hz ~ 8MHz) and temperature (20 ~ 160 °C) for the different compositions. Impedance and modulus studies reveal a Debye-type relaxation phenomenon. The dielectric studies manifest promising dielectric properties. The bactericidal performance of all nanomembranes is evaluated. The nanomembrane with 20% BNKT (C20) exhibits bactericidal activity against Gram-negative and Gram-positive bacteria, with 6 log CFU reductions observed after an exposure time of 180 min. Treatment with the C20 nanomembrane shows the highest amounts of protein efflux. The results indicate that the C20 nanomembrane layer eradicated all bacterial cells. The findings suggest that the C20 nanomembrane is recommended as an intelligent and innovative antibacterial nano-system for bio-applications.

Bacterial Cellulose

10.1007/s10570-023-05416-0

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Citations (5)