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.

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.

Controllable self-assembly of a novel Bi2MoO6-based hybrid photocatalyst: excellent photocatalytic activity under UV, visible and near-infrared irradiation

2016 ◽  
Vol 52 (39) ◽  
pp. 6525-6528 ◽  
Author(s):  
Yuchen Hao ◽  
Xiaoli Dong ◽  
Shangru Zhai ◽  
Xiuying Wang ◽  
Hongchao Ma ◽  
...  
Keyword(s):  
Self Assembly ◽  
Near Infrared ◽  
Carbon Nanodots ◽  
Step Method ◽  
Excellent Photocatalytic Activity ◽  
One Step ◽  
Uv Visible ◽  
Nitrogen Doped Carbon ◽  
Bi Nanoparticles ◽  
Hybrid Photocatalyst

Herein, using a simple one-step method, a Bi2MoO6-based photocatalyst with novel ultrathin nanohollow structure and simultaneous sub-10 nm Bi nanoparticles and sub-1 nm graphitic nitrogen-doped carbon nanodots (NCDs) modification were successfully obtained.

scholarly journals Thiol-Affinity Immobilization of Casein-Coated Silver Nanoparticles on Polymeric Membranes for Biofouling Control

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2057 ◽  
Author(s):  
Xiaobo Dong ◽  
Halle D. Shannon ◽  
Atena Amirsoleimani ◽  
Gail M. Brion ◽  
Isabel C. Escobar
Keyword(s):  
Silver Nanoparticles ◽  
Serratia Marcescens ◽  
Antimicrobial Properties ◽  
Thiol Group ◽  
Polymeric Membranes ◽  
Step Method ◽  
Crossflow Filtration ◽  
Dead End ◽  
Affinity Immobilization ◽  
One Step

Silver nanoparticles (AgNPs) have been widely studied for the control of biofouling on polymeric membranes due to their antimicrobial properties. However, nanoparticle leaching has posed a significant impediment against their widespread use. In this study, a one-step method of chemically embedding AgNPs on cellulose acetate (CA) membranes via their affinity to thiol group chemistry was investigated. The operational efficiency of the membranes was then determined via filtration and biofouling experiments. During filtration study, the average flux values of pure CA membranes was determined to be 11 ± 2 L/(m2·hr) (LMH), while membranes embedded with AgNPs showed significant increases in flux to 18 ± 2 LMH and 25 ± 9 LMH, with increasing amounts of AgNPs added, which is likely due to the NPs acting as pore formers. Leaching studies, performed both in dead-end and crossflow filtration, showed approximately 0.16 mg/L leaching of AgNPs after the first day of filtration, but afterwards the remaining chemically-attached AgNPs did not leach. Over 97% of AgNPs remained on the membranes after seven days of crossflow leaching filtration studies. Serratia marcescens were then used as target microorganisms in biofouling studies. It was observed that membranes embedded with AgNPs effectively suppressed the growth of Serratia marcescens, and specifically, membranes with AgNPs displayed a decrease in microbial growth by 59% and 99% as the amount of AgNP increased.

Modification of Waste Leather Trimming with in Situ Generated Silver Nanoparticles by One Step Method

2021 ◽  
Vol 14 (2) ◽  
Author(s):  
Basa Ashok ◽  
Mallavarapu Umamahesh ◽  
Natarajan Hariram ◽  
Suchart Siengchin ◽  
Anumakonda Varada Rajulu
Keyword(s):  
Silver Nanoparticles ◽  
Silver Oxide ◽  
Low Cost ◽  
Step Method ◽  
Mean Size ◽  
One Step ◽  
Silver Oxide Nanoparticles ◽  
Inhibition Zones ◽  
Xrd Studies

Waste leather trimming (WLT) was modified by in situ generation of silver nanoparticles (AgNPs) and silver oxide nanoparticles (Ag2ONPs) by one step thermal assisted method. The modified WLT was analyzed by FTIR, SEM, EDS, XRD and TGA techniques and antibacterial analysis. The generated silver based nanoparticles had a mean size of 93 nm. The FTIR spectra revealed no major changes between WLT and modified WLT. The XRD studies indicated additional peaks in the diffractogram of modified WLT which belonged to AgNPs and Ag2ONPs. The unmodified WLT had four inflection temperatures at 89, 303, 454, and 785°C while these values for the modified WLT were 84, 211, 305, and 328°C indicating a slight lowering of thermal stability due to the catalytic activity of the generated silver based nanoparticles. Further, the modified WLT formed the inhibition zones against E.coli, P.aeruinosa, S.aeureus and B.lichinomonas bacteria with diameters of 33, 36, 29, and 30 mm respectively. Hence, the modified WLT can be considered as filler for making low cost antibacterial biocomposites.

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