scholarly journals Exploring the optical limiting, photocatalytic and antibacterial properties of the BiFeO3–NaNbO3 nanocomposite system

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8450-8458
Author(s):  
Rehana P. Ummer ◽  
Sreekanth Perumbilavil ◽  
Jiya Jose ◽  
Sabu Thomas ◽  
Pramod Gopinath ◽  
...  
Keyword(s):  
Thin Films ◽  
Antibacterial Properties ◽  
Optical Limiting ◽  
Pmma Matrix ◽  
System P ◽  
Nanocomposite System

Thin films of BiFeO3–NaNbO3 composites were fabricated in a PMMA matrix.

scholarly journals The Physicochemical and Antibacterial Properties of Chitosan-Based Materials Modified with Phenolic Acids Irradiated by UVC Light

2021 ◽  
Vol 22 (12) ◽  
pp. 6472
Author(s):  
Beata Kaczmarek-Szczepańska ◽  
Marcin Wekwejt ◽  
Olha Mazur ◽  
Lidia Zasada ◽  
Anna Pałubicka ◽  
...  
Keyword(s):  
Thin Films ◽  
Antimicrobial Activity ◽  
Ferulic Acid ◽  
Phenolic Acid ◽  
Food Packaging ◽  
Antibacterial Properties ◽  
Force Microscopy ◽  
Atomic Force ◽  
Before And After

This paper concerns the physicochemical properties of chitosan/phenolic acid thin films irradiated by ultraviolet radiation with wavelengths between 200 and 290 nm (UVC) light. We investigated the preparation and characterization of thin films based on chitosan (CTS) with tannic (TA), caffeic (CA) and ferulic acid (FA) addition as potential food-packaging materials. Such materials were then exposed to the UVC light (254 nm) for 1 and 2 h to perform the sterilization process. Different properties of thin films before and after irradiation were determined by various methods such as Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), differential scanning calorimeter (DSC), mechanical properties and by the surface free energy determination. Moreover, the antimicrobial activity of the films and their potential to reduce the risk of contamination was assessed. The results showed that the phenolic acid improving properties of chitosan-based films, short UVC radiation may be used as sterilization method for those films, and also that the addition of ferulic acid obtains effective antimicrobial activity, which have great benefit for food packing applications.

scholarly journals Optical Properties of Sn Doped ZnO Thin Film Prepared Using Sol-Gel Method for Optical Limiting Application

2021 ◽  
Vol 24 (3) ◽  
pp. 38-42
Author(s):  
Marwa Mudfer Alqaisi ◽  
◽  
Alla J. Ghazai ◽  
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Optical Properties ◽  
Sol Gel ◽  
Visible Region ◽  
Optical Limiting ◽  
Pure Zinc ◽  
Gel Method ◽  
Sol Gel Method ◽  
Doped Zno

In this work, pure Zinc oxide and tin doped Zinc oxide thin films nanoparticles with various volume concentrations of 2, 4, 6, and 8V/V% were prepared by using the sol-gel method. The optical properties were investigated by using UV-Visible spectroscope, and the value exhibits the direct allowed transition. The average of transmittance was around ~(17-23) %in visible region. The optical energy band gap was calculated with wavelength (300-900) nm for pure ZnO and Sn doped ZnO thin films which decreases with increasing concentration from 3.4 eV to 3.1 eV respectively and red shift. The real dielectric(εr) and the imaginary dielectric εiare the same behavior of the refractive index(n) the extinction coefficient (k) respectively. The optical limiting properties were studied by using an SDL laser with a wavelength of 235 nm. ZnO and doping thin films an found efficient as optic limiting and depend on the concentration of the all samples.

cis-to-trans isomerization of azobenzene investigated by using thin films of metal–organic frameworks

2015 ◽  
Vol 17 (35) ◽  
pp. 22721-22725 ◽  
Author(s):  
Xiaojuan Yu ◽  
Zhengbang Wang ◽  
Maria Buchholz ◽  
Nena Füllgrabe ◽  
Sylvain Grosjean ◽  
...  
Keyword(s):  
Thin Films ◽  
Metal Organic Frameworks ◽  
Model System ◽  
Trans Isomerization ◽  
System P ◽  
Metal Organic

The energetic barrier for the cis-to-trans isomerization of azobenzene was experimentally investigated by using thin films of azobenzene-containing MOFs as well-defined model system.

Refractive Index Tailoring of Poly(methylmethacrylate) Thin Films by Embedding Silver Nanoparticles

2012 ◽  
Vol 585 ◽  
pp. 134-138 ◽  
Author(s):  
Alisha Goyal ◽  
Jyoti Rozra ◽  
Isha Saini ◽  
Pawan K. Sharma ◽  
Annu Sharma
Keyword(s):  
Thin Films ◽  
Silver Nanoparticles ◽  
Refractive Index ◽  
Band Gap ◽  
Ag Nanoparticles ◽  
Nanocomposite Films ◽  
Ex Situ ◽  
Plasmon Resonance Peak ◽  
Pmma Matrix ◽  
Vis Spectroscopy

Nanocomposite films of Poly (methylmethacrylate) with different concentration of silver nanoparticles were prepared by ex-situ method. Firstly, silver nanoparticles were obtained by reducing the aqueous solution of silver nitrate with sodium borohydride then Ag-PMMA films were prepared by mixing colloidal solution of silver nanoparticles with solution of polymer. Thin solid films were structurally characterized using UV-VIS spectroscopy and TEM. The appearance of surface plasmon resonance peak, characteristic of silver nanoparticles at 420 nm in UV-VIS absorption spectra of Ag-PMMA films confirms the formation of Ag-PMMA nanocomposite. TEM showed Ag nanoparticles of average size 8 nm embedded in PMMA matrix. Analysis of absorption and reflection data indicates towards the reduction in optical band gap and increase in refractive index of the resulting nanocomposite. The synthesized Ag-PMMA nanocomposite has been found to be more conducting than PMMA as ascertained using I-V studies. The decrease in band gap and increase in conductivity can be correlated due to the formation of localized electronic states in PMMA matrix due to insertion of Ag nanoparticles. The PMMA thin films with dispersed silver nanoparticles may be useful for nanophotonic devices.

Microstructural, nanomechanical and antibacterial properties of magnetron sputtered nanocomposite thin films of CrN/Cu

2012 ◽  
Vol 28 (2) ◽  
pp. 134-140 ◽  
Author(s):  
P Kuppusami ◽  
T Elangovan ◽  
S Murugesan ◽  
R Thirumurugesan ◽  
S Khan ◽  
...  
Keyword(s):  
Thin Films ◽  
Antibacterial Properties ◽  
Nanocomposite Thin Films

Dynamic optical limiting experiments on vanadium dioxide and vanadium pentoxide thin films irradiated by a laser beam

2006 ◽  
Vol 45 (14) ◽  
pp. 3378 ◽  
Author(s):  
Weiping Wang ◽  
Yongquan Luo ◽  
Dayong Zhang ◽  
Fei Luo
Keyword(s):  
Thin Films ◽  
Laser Beam ◽  
Vanadium Pentoxide ◽  
Vanadium Dioxide ◽  
Optical Limiting

Defect assisted nonlinear absorption and optical limiting in amorphous TlGaS2(1-x)Se2(x) (0 ⩽ x ⩽ 1) thin films

2021 ◽  
pp. 118540
Author(s):  
Bekir Asilcan Ünlü ◽  
Ahmet Karatay ◽  
Elif Akhuseyin Yildiz ◽  
Türkan Dinçbay ◽  
Hüseyin Ünver ◽  
...  
Keyword(s):  
Thin Films ◽  
Nonlinear Absorption ◽  
Optical Limiting

Ultrafast broadband reverse saturation absorption in Al-doped InSe thin films for optical limiting at visible/near-infrared

2020 ◽  
Vol 108 ◽  
pp. 110171 ◽  
Author(s):  
Xiaoyan Yan ◽  
Xingzhi Wu ◽  
Yu Fang ◽  
Wenjun Sun ◽  
Chengbao Yao ◽  
...  
Keyword(s):  
Thin Films ◽  
Near Infrared ◽  
Optical Limiting ◽  
Reverse Saturation Absorption ◽  
Saturation Absorption

A comparative study on the dynamic heterogeneity of supercooled polymers under nanoconfinement

2019 ◽  
Vol 21 (28) ◽  
pp. 15888-15898 ◽  
Author(s):  
Shu-Jia Li ◽  
Hu-Jun Qian ◽  
Zhong-Yuan Lu
Keyword(s):  
Thin Films ◽  
Comparative Study ◽  
Polymer Thin Films ◽  
Dynamic Heterogeneity ◽  
System P ◽  
Temporal Parts

Dynamic gradient and faster dynamics on average in polymer thin films are two leading factors, resulted from the nanoconfinement effect, have distinct influences on spatial and temporal parts of the dynamic heterogeneity in the system.

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