scholarly journals Citrus Lemon Juice Mediated Preparation of AgNPs/Chitosan-Based Bionanocomposites and Its Antimicrobial and Antioxidant Activity

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
S. Rajeshkumar
Keyword(s):  
Infrared Spectroscopy ◽  
Fungal Pathogens ◽  
Near Infrared ◽  
Lemon Juice ◽  
Advanced Materials ◽  
Atomic Force ◽  
Transmission Electron ◽  
Silver Nanocomposite ◽  
Antioxidant And Antimicrobial Activity ◽  
Antimicrobial And Antioxidant Activity

Nanoparticles are important advanced materials with numerous uses in a variety of fields. Novel antibacterial nanocomposites with synergistic capabilities can be created by combining metal nanoparticles with biopolymers of various functionalities. This research evaluates an antimicrobial and antioxidant-rich chitosan-based silver nanocomposite synthesized by using citrus lemon extract as a reducing and capping agent. UV-vis spectrophotometer, scanning electron microscope, elemental dispersive analysis, X-ray diffraction assay, atomic force microscope, Fourier transform infrared spectroscopy, UV-near infrared spectroscopy, and transmission electron microscopy were used to characterize the chitosan-based silver nanocomposite (CS-Ag nanocomposite). The nanocomposite synthesized is used to demonstrate antioxidant and antimicrobial activity against fungal pathogens.

scholarly journals Simple One-Step Method to Synthesize Polypyrrole-Indigo Carmine-Silver Nanocomposite

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Lara Fernandes Loguercio ◽  
Pedro Demingos ◽  
Luiza de Mattos Manica ◽  
Jordana Borges Griep ◽  
Marcos José Leite Santos ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Infrared Spectroscopy ◽  
Near Infrared ◽  
Indigo Carmine ◽  
Electrochemical Process ◽  
Conjugation Length ◽  
Step Method ◽  
Polypyrrole Films ◽  
One Step ◽  
Silver Nanocomposite

A nanocomposite of indigo carmine doped polypyrrole/silver nanoparticles was obtained by a one-step electrochemical process. The nanocomposite was characterized by scanning electron microscopy, infrared spectroscopy, ultraviolet-visible-near infrared spectroscopy, and cyclic voltammetry. The simple one-step process allowed the growth of silver nanoparticles during the polymerization of polypyrrole, resulting in films with electrochromic behavior and improved electroactivity. In addition, polypyrrole chains in the nanocomposite were found to present longer conjugation length than pristine polypyrrole films.

Synthesis of Gold Nanorods by Using H2O2 as the Weak Reducer in a Binary Surfactant Mixture

2020 ◽  
Vol 65 ◽  
pp. 157-164
Author(s):  
Shu Ting Zhang ◽  
Zhi Ang Liu ◽  
Ming Yue Hu ◽  
Sulan Ma ◽  
Min Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Infrared Spectroscopy ◽  
Gold Nanorods ◽  
Near Infrared ◽  
Surfactant Mixture ◽  
Growth Technique ◽  
Transmission Electron ◽  
Wide Range ◽  
Potential Applications

A new seed-mediated growth technique for synthesizing gold nanorods (NRs) by using H2O2 as the weak reducer in the presence of a binary surfactant mixture is reported. Gold NRs prepared at different amounts of H2O2 and the gold seeds solution were characterized by transmission electron microscopy (TEM) and visible–near infrared spectroscopy. Gold NRs with tunable aspect ratio from 4.5 to 7 can be obtained and the corresponding longitudinal plasmonic wavelength of the produced gold NRs are tunable from 810 to 1140 nm. This method provides a new pathway for synthesis of gold NRs with a wide range of longitudinal plasmonic peaks, which have potential applications in optoelectronics and biomedicine.

scholarly journals Nano Gold Spheres and Rods: Synthesis and Characterization

2021 ◽  
Vol 2114 (1) ◽  
pp. 012032
Author(s):  
Saif M. Ali ◽  
Logean Qadri Al-Karam
Keyword(s):  
Near Infrared ◽  
Visible Range ◽  
Infrared Range ◽  
Nano Gold ◽  
Atomic Force ◽  
Transmission Electron ◽  
Three Samples ◽  
Uv Visible ◽  
Shape Sphere ◽  
Two Peaks

Abstract The present study aims to synthesised nano gold with chemical method with two shape sphere and rod with multi diameter and aspect ratio and then characterize the synthesised material with Atomic Force Microscope (AFM), Transmission Electron Microscope (TEM) and Ultraviolet-visible (UV–Visible ) spectrophotometer. The AFM and TEM characterization result of three samples for each sphere and rods show that the synthesised material are in nano range with diameter 31.9 nm, 36.19 nm and 79.37 nm respectively for nano sphere and diameters 39.9nm, 36.05 nm and 28 nm respectively for nano-rods samples and the UV-Visible spectrophotometer show that peak of surface plasmon resonance of nano-sphere are at wavelengths 532 nm, 535 nm and 546 nm and all are in the visible range and nano-rod have two peaks one in the visible range at wavelengths 525nm,518nm and 531nm and the other peak is in the near infrared range at wavelengths 633nm, 680nm and 875 nm respectively.

Scanning tunneling microscopy and atomic force microscopy: New tools for biology

1989 ◽  
Vol 47 ◽  
pp. 778-779
Author(s):  
CE Bracker ◽  
P. K. Hansma
Keyword(s):  
Physical Property ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Small Scale ◽  
Tunneling Microscopy ◽  
Force Microscopy ◽  
New Family ◽  
Small Probe ◽  
Atomic Force ◽  
Transmission Electron

A new family of scanning probe microscopes has emerged that is opening new horizons for investigating the fine structure of matter. The earliest and best known of these instruments is the scanning tunneling microscope (STM). First published in 1982, the STM earned the 1986 Nobel Prize in Physics for two of its inventors, G. Binnig and H. Rohrer. They shared the prize with E. Ruska for his work that had led to the development of the transmission electron microscope half a century earlier. It seems appropriate that the award embodied this particular blend of the old and the new because it demonstrated to the world a long overdue respect for the enormous contributions electron microscopy has made to the understanding of matter, and at the same time it signalled the dawn of a new age in microscopy. What we are seeing is a revolution in microscopy and a redefinition of the concept of a microscope.Several kinds of scanning probe microscopes now exist, and the number is increasing. What they share in common is a small probe that is scanned over the surface of a specimen and measures a physical property on a very small scale, at or near the surface. Scanning probes can measure temperature, magnetic fields, tunneling currents, voltage, force, and ion currents, among others.

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