Informatics Publishing Limited

A. Atef El-Sayed ¹, M. Salama ¹, T. Salem ¹, M. Rehan ¹

Affiliations
1 Textile Research Division, National Research Centre, El Bohouthst, 12622, Dokki, Giza, EG

Abstract

Objectives: In this paper, a novel attempt has been made to develop anionic waterborne polyurethane with antibacterial properties. Methods/Analysis: To achieve this goal, a one-pot synthesis was used to incorporate silver nanoparticles into the Waterborne Polyurethane (WPU) via a combination of reduction of silver ions and polymerization reactions. This silver/waterborne nanocomposite was applied as a modifier for preparing antimicrobial viscose fabric with enhanced coloration and fastness properties. Findings: A bacterial reduction of 100% is observed during the antibacterial activity tests of the nanocomposites for both Escherichia coli and Candida albicans. Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD) was used to confirm the formation of Ag nanoparticles in WPU. Scanning Electron Microscopy (SEM-EDX) and Fourier Transform Infrared Spectroscopy (FTIR) were used to verify the presence of silver/waterborne composites layers. Exploration of the fastness properties and the color strength (K/S) of colored viscose fabrics were also performed. Novelty/Improvement: The obtained results can be considered as a measure of the degree of the interaction between dyes such as cationic and reactive classes and different modified surfaces.

Keywords

Antibacterial, Coating, Nanocomposites, Silver Nanoparticles, Water Borne Polyurethane.

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P. L. Sharma ¹, M. Rehan ¹

Affiliations
1 Department of Mathematics, Himachal Pradesh University, Summer Hill, Shimla - 171005, IN

Abstract

Cryptography is the science which provides confidentiality, authenticity and integrity to the users over the prevailing insecure communication channels. Encryption is the transformation of data into some unreadable form. The purpose is to ensure privacy by keeping the information hidden from anyone for whom it is not intended, even those who can see the encrypted data. Decryption is the reverse of encryption; it is the transformation of encrypted data back into some intelligible form. Encryption and decryption require the use of some secret information, usually referred to as a key. Hill cipher in cryptography is a symmetric key substitution algorithm, which is vulnerable to known plain text attack. We modify the existing Hill cipher by using Vandermonde matrix and introducing the elements of finite field which provides more security to the said cipher.

Keywords

Plain Text, Symmetric Key, Hill Cipher, Finite Field, Vandermonde Matrix.

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