Surface Modification of Alumina Nano-Particles by UV-Induced Grafting Polymerization of 2-Hydroxyethyl Methacrylate

2010 ◽  
Vol 93-94 ◽  
pp. 95-98 ◽  
Author(s):  
K. Yantaboot ◽  
S. Maensiri ◽  
Paveena Khansawai ◽  
Sittipong Amnuaypanich
Keyword(s):  
Uv Irradiation ◽  
Irradiation Time ◽  
Nano Particles ◽  
Hydroxyethyl Methacrylate ◽  
Alumina Surface ◽  
Sequential Method ◽  
Grafting Polymerization ◽  
Alumina Particles ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Alumina nano-particles was grafted with poly(2-hydroxyethyl methacrylate) (PHEMA) utilizing the sequential method; that is, the alumina surface was first rendered with initiator, benzophenone, by UV-irradiation followed by the grafting polymerization of HEMA on the surface which was initiated thermally and propagated via the free-radical polymerization. FT-IR spectroscopy confirmed the successful grafting of PHEMA onto the alumina surface. Determined by thermalgravimetry (TG), the amount of benzophenone on the alumina surface was found to increase with the UV-irradiation time; however upon grafting of PHEMA, the amount of grafted-PHEMA was the same irrespective of the reaction time. The glass transition temperature (Tg) of grafted-PHEMA on alumina particles was approximately 93 °C that is higher than that of PHEMA which has Tg around 85 °C. This indicates the more restricted movement of grafted-PHEMA compared with the ungrafted-PHEMA.

Determination of the Orientation of Adsorbed Pyridine and γ-MPS on Alumina Surface by Photoacoustic FT-IR Spectroscopy

1986 ◽  
Vol 40 (6) ◽  
pp. 851-856 ◽  
Author(s):  
Marek W. Urban ◽  
Jack L. Koenig
Keyword(s):  
Surface Coverage ◽  
Hydroxyl Groups ◽  
Alumina Surface ◽  
Surface Hydroxyl ◽  
Adsorbed Pyridine ◽  
Ft Ir ◽  
Infrared Photoacoustic Spectroscopy ◽  
Pyridinium Ion ◽  
Ft Ir Spectroscopy

Fourier transform infrared photoacoustic spectroscopy has been applied to determine the structure and orientation of pyridine and γ-Metacryl-oxypropyltriethoxysilane (γ-MPS) on γ-Al2O3 surface. Adsorption of pyridine on activated γ-Al2O3 leads to formation of a pyridinium ion (pyN+-H) and pyridine N-oxide. The orientation of pyridinium ion on the alumina surface is random, whereas the pyridine N-oxide is parallel with respect to the surface. The adsorption of oligomers of γ-MPS gives parallel layers on the alumina surface. At low γ-MPS surface coverage, the carbonyl groups interact with the surface hydroxyl groups. Increasing surface coverage leads to an excess of the free C=O species.

Effects of added phthalate plasticizers on photodegradation of irradiated poly (α-methylstyrene) films

2015 ◽  
Vol 35 (2) ◽  
pp. 159-167 ◽  
Author(s):  
Afrah E. Ramadhan
Keyword(s):  
Dibutyl Phthalate ◽  
Irradiation Time ◽  
Broad Band ◽  
Dioctyl Phthalate ◽  
Solid Films ◽  
Polymeric Chains ◽  
Ft Ir ◽  
The Stability ◽  
Monomer Fluorescence ◽  
Ft Ir Spectroscopy

Abstract The effects of UV irradiation and blending on the stability of poly (α-methylstyrene) (PαMS) in solid films were studied at different intervals of irradiation time in the presence of air, by absorption, emission and Fourier transform infrared (FT-IR) spectroscopy. The increase in irradiation time caused an increase in the intensity of the absorption band of the polymer, and an increase in the intensity of absorption of a new broad band at a longer wavelength, thus indicating the possibility of photodegradation of polymeric chains. The influence of added plasticizers, dimethyl terephthalate (DMT), diethyl terephthalate (DET), dibutyl phthalate (DBP), dioctyl phthalate (DOP) and dioctyl terephthalate (DOT) on photoquenching of the polymer fluorescence band was also investigated, and found to increase the photoquenching processes with increase in the amount of added plasticizers. By contrast, the intensity of excimer and monomer fluorescence bands was also found to decrease with increase in irradiation times. These changes may be attributed to the formation of new photoproducts which resulted from the photodegradation and photooxidation of irradiated polymeric chains. In addition, the observed increase in the intensities of the carbonyl and hydroxyl regions of the FT-IR spectra provides evidence for the photooxidation of polymeric chains. The increase in the intensity of some bands and the disappearance of new bands indicate the photodegradation of polymeric chains.

Synthesis of Posnjakite Nanoparticles in the Presence of a New Capping Agent

2016 ◽  
Vol 35 (5) ◽  
pp. 457-462 ◽  
Author(s):  
Mehdi Bazarganipour ◽  
Mahnaz Sahebi-Harandi ◽  
Masoud Salavati-Niasari
Keyword(s):  
Microwave Power ◽  
Irradiation Time ◽  
Heating Time ◽  
Molar Ratio ◽  
Capping Agent ◽  
X Ray Diffraction ◽  
X Ray ◽  
Methylene Orange ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

AbstractPosnjakite nanoparticles, Cu4SO4(OH)6 · H2O, were synthesized by utilizing a new thio-Schiff base ligand as new capping agent via a microwave approach. The effects of molar ratio, surfactants, heating time and microwave power on morphology of the product were investigated. The as-synthesized posnjakite nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and energy dispersive X-ray analysis (EDAX). The effects of different parameters such as the molar ratio, surfactants, microwave power and irradiation time on the morphology of the products were investigated. Moreover, adsorption of methylene orange dye on posnjakite nanoparticles was considered and the uptake percent was determined to be >65% in 200 min.

scholarly journals Ciprofloxacin Based on Carrier Double Layered Hydroxide Nano-particles of Fe+3/Fe+2, Fe+3/Ni+2, Al+3/Fe+2, and Al+3/Ni+2 Ions

2020 ◽  
Vol 10 (01) ◽  
pp. 119-126
Author(s):  
Noor M. Mohammed ◽  
Farah AH. Kadhim ◽  
Aseel A. Hammood ◽  
Ashour H. Dawood
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Force ◽  
Ft Ir ◽  
Double Layered Hydroxide ◽  
Scanning Electron ◽  
Ft Ir Spectroscopy

The double-layered hydroxide nano-particles compounds with ciprofloxacin drug were carried out by preparation of the double layered hydroxide (DLH) of M+3/M+2 ions for selective ions. The ciprofloxacin drug was inserted between them. The resulted compounds were characterized by X-Ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM), and Fourier Transform Infrared (FT-IR) spectroscopy; the antibacterial studied done by using the gram (+) and gram (-) pigments.

Self-cleaning effect of electrospun poly (1,4-cyclohexanedimethylene isosorbide terephthalate) nanofibers embedded with zinc oxide nanoparticles

2017 ◽  
Vol 88 (21) ◽  
pp. 2493-2498 ◽  
Author(s):  
Muhammad Qamar Khan ◽  
Hoik Lee ◽  
Jun Mo Koo ◽  
Zeeshan Khatri ◽  
Jianhua Sui ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Irradiation Time ◽  
Cleaning Efficiency ◽  
Transmission Electron ◽  
Uniform Dispersion ◽  
Ft Ir ◽  
Self Cleaning ◽  
Ft Ir Spectroscopy

This study examined the photocatalytic self-cleaning of novel nanofibers of co-polyester poly(1,4-cyclohexanedimethylene isosorbide terephthalate) (PICT). To obtain the self-cleaning property, zinc oxide (ZnO) nanoparticles were blended into the solution of PICT at five different concentrations. The morphology of the nanofibers was analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the degradation spectrum of the target dyes was confirmed by Fourier Transform Infrared (FT-IR) spectroscopy. Especially in the TEM images, there was clear evidence of a uniform dispersion of the ZnO nanoparticles embedded in the nanofibers. As the concentration of ZnO increased to 9 wt%, there was a greater dispersion of the ZnO nanoparticles on the nanofibers. The photocatalytic activity indicated that more efficient self-cleaning occurred at an irradiation time of 3 hours and a 9% concentration of ZnO nanoparticles in the nanofibers. We achieved around 99% self-cleaning efficiency from these nanofibers.

scholarly journals Synthesis, characterization of Ag-doped CdS-WO2 nanocomposite and effects of photocatalytic degradation in RhB under visible light irradiation

2022 ◽  
Author(s):  
G. Roshini ◽  
V. Sathish ◽  
S. Manigandan ◽  
A. Tamilarasi ◽  
E. Priyanka
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Irradiation Time ◽  
Light Irradiation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Abstract In this paper, the highly stable Ag/CdS-WO2 nanocomposite was fabricated by a facile and capping agent-free hydrothermal technique. The fabricated Ag doped CdS-WO2 nanocomposite were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and UV-vis diffuse reflectance (DRS) spectroscopy. The photocatalytic performance of synthesized photocatalysts was evaluated for the photodegradation of rhodamine B (Rh B) under visible light irradiation (VLI). The parameters used for the optimization of the photocatalyst were pH, catalyst dose, oxidant dose, and irradiation time. Based on this, a possible reaction mechanism for the enhancement of photocatalytic activity of Ag/CdS-WO2 has been proposed. Hence, we have a tendency to believe it might be a promising material that may be used for the photodegradation of organic pollutants present in wastewater.

An In Vitro Study on Inhibiting Pathogenic Activity by Biosynthesized Silver Nanoparticles using Dioscorea Pentaphylla

2021 ◽  
Vol 14 (2) ◽  
pp. 5412-5423
Author(s):  
Muniyappan N ◽  
Murugan Murugapandi
Keyword(s):  
Silver Nanoparticles ◽  
In Vitro Study ◽  
Nano Particles ◽  
Biological Synthesis ◽  
Morphological Studies ◽  
Nanoparticles Concentration ◽  
Phenolic Group ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Development of biologically stimulated experimental processes for the biosynthesis of nanoparticles is an essential branch of nanobiotechnology. Biocompatible silver nanoparticles have  acknowledged  significant notice in recent years because of their capable applications in bioimaging, biosensors, biolabels, and biomedicine. This study reports a green chemistry approach for the biological synthesis of silver nanoparticles by using the rhizomes extract of Dioscorea Pentaphylla. The properties of synthesis nanoparticles were characterized by UV-Visible spectroscopy, FT-IR, SEM, TEM and EDS. Surface Plasmon Resonance (SPR) spectrum for silver nano-particles is obtained at 426 with dark brown color. FT-IR spectroscopy revealed   that silver nanoparticles were functionalized with bio- molecules that have primary amine group (NH2), carbonyl phenolic group (-OH) and other stabilizing functional groups. The Morphological studies revealed that the particles are spherical in shape and in the size ranged from 20 ± 1nm. The effects of silver nanoparticles concentration and extract concentration  were investigated and DPR-AgNPs showed the better pharma- cological applications.

Preparation and Properties of Nanocomposites Based on Poly(Lactic Acid) and Modified TiO2

2012 ◽  
Vol 463-464 ◽  
pp. 519-522 ◽  
Author(s):  
Achanai Buasri ◽  
Nattawut Chaiyut ◽  
Chanon Kritsanakun ◽  
Chettha Phatkun ◽  
Tiwiwan Khunsri
Keyword(s):  
Lactic Acid ◽  
Propionic Acid ◽  
Uv Irradiation ◽  
Nano Particles ◽  
Poly Lactic Acid ◽  
Nano Composites ◽  
Nano Particle ◽  
High Transparency ◽  
Wide Range ◽  
Ft Ir

In this study, poly (lactic acid) (PLA)-TiO2nano particle nano composites were prepared and the severe aggregation of TiO2nano particles in polymer matrixwere reduced by themodification of TiO2surface with propionic acid and n-hexylamine. The resulting products were characterized by FT-IR, DSCand SEMtechniques so as to have a better understanding of bondingbetween the polymer and nano particles. All of nano composites with a wide range of TiO2additionexhibit the high transparency. SEM micrographs of the nano composites showed of the TiO2nano particles were uniformly dispersed in polymer matrices. Photodegradation of PLA-TiO2nano particle nano composites were also investigated. The results indicated that nano composites could be efficiently photodegraded by UV irradiation in comparison with pure PLA.

Fabrication Study of Hydrophobic Polyurethane Sponge for Oil Absorption Application

2017 ◽  
Vol 751 ◽  
pp. 731-737
Author(s):  
Peeranut Prakulpawong ◽  
Jinjutha Wiriyanantawong ◽  
Janista Pornpoonsawat ◽  
Supan Yodyingyong ◽  
Darapond Triampo
Keyword(s):  
Uv Irradiation ◽  
Oil Spill ◽  
Irradiation Time ◽  
Treatment Method ◽  
Absorption Efficiency ◽  
Oil Absorption ◽  
Uv Treatment ◽  
Simple Method ◽  
Ft Ir ◽  
Oil Spill Cleanup

In this research, the researchers study the fabrication of oil absorption, hydrophobic polyurethane (PU) sponge for application in an oil-spill cleanup model. Virgin PU is initially hydrophilic. PU is made hydrophobic by incorporating hydrophobic silica aerogel (SA) into PU 3D porous structure by stirring method and UV-treatment method. UV-irradiation promotes the attachment of SA onto the PU surface. Varying UV irradiation time and concentration of SA is done to attain an optimal attachment of SA on PU. Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), contact angle measurements (CA) are used to determine the adhesion of SA on PU. The loadings of SA with and without UV-treatment are compared. Results show that SA-PU with UV-treatment has more loading of SA than SA-PU without treatment. FT-IR spectra and SEM micrographs verify the results. Moreover, the SA-PU is tested for oil absorption to simulate oil-spill cleanup. The findings show fast (less than 3 seconds), recoverable oil-spills cleanup with simple method of preparation. In addition, SA-PU with UV treatment has higher absorption rate and %absorption efficiency when compared to original PU and SA-PU without UV treatment.

scholarly journals Synthesis, characterization of Ag doped CdS-WO2 nanocomposite and effects of photocatalytic degradation in RhB under visible light irradiation

2022 ◽  
Author(s):  
G. Roshini ◽  
Sathish Vilvanathan ◽  
S. Manigandan ◽  
A. Tamilarasi ◽  
E. Priyanka
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Irradiation Time ◽  
Light Irradiation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

In this paper, the highly stable Ag/CdS-WO2 nanocomposite was fabricated by a facile and capping agent-free hydrothermal technique. The fabricated Ag-doped CdS-WO2 nanocomposite was characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and UV-vis diffuse reflectance (DRS) spectroscopy. The photocatalytic performance of synthesized photocatalysts was evaluated for the photodegradation of rhodamine B (RhB) under visible light irradiation (VLI). The parameters used for the optimization of the photocatalyst were pH, catalyst dose, oxidant dose, and irradiation time. Based on this, a possible reaction mechanism for the enhancement of the photocatalytic activity of Ag/CdS-WO2 has been proposed. Hence, we have a tendency to believe it might be a promising material that may be used for the photodegradation of organic pollutants present in wastewater.

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