Migration, physical and antibacterial properties of silver zeolite/poly(butylene succinate) composite films for food packaging applications

2019 ◽  
Vol 39 (3-4) ◽  
pp. 95-110 ◽  
Author(s):  
Nissapa Wattanawong ◽  
Kanchana Chatchaipaiboon ◽  
Natchanan Sreekirin ◽  
Duangdao Aht-Ong
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antibacterial Activity ◽  
Food Packaging ◽  
Composite Films ◽  
Zeolite A ◽  
Color Analysis ◽  
Butylene Succinate ◽  
X Ray ◽  
Scanning Electron

Bacterial growth on food is a main factor in the reduction of food quality, leading to short-term food shelf life. Development of antibacterial packaging can inhibit the bacterial growth and extend food shelf life. Silver loaded zeolite was used as the antibacterial agent in this work. Three zeolites (different Si/Al ratio) such as zeolite A, zeolite Y, and zeolite Socony Mobil-5 (ZSM-5) incorporating with the same silver content were prepared. The characterization was carried out by energy dispersive X-ray spectroscopy, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption, and color analysis. Antibacterial activity of the three silver zeolites was tested against Escherichia coli and Staphylococcus aureus. Silver loaded zeolite ZSM-5 showed better bacterial inhibition than silver incorporated zeolite A and Y. For composite film preparation, silver loaded zeolite ZSM-5/poly(butylene succinate) composite films were prepared by varying silver loaded zeolite ZSM-5 concentrations and characterized by different techniques (mechanical test, scanning electron microscopy, and color analysis). Poly(butylene succinate) composite films filled with silver loaded zeolite ZSM-5 showed 99.9% of bacterial reduction within 24 h, indicating the effective antibacterial activity. From the silver migration results, the silver release from poly(butylene succinate) films was less than the limitation of European Food Safety Authority regulation, indicating the safety for food packaging applications.

Kaolinite dispersion in cassava starch-based composite films: a photonic microscopy and X-ray tomography study

2018 ◽  
Vol 38 (7) ◽  
pp. 641-647
Author(s):  
Jean Aimé Mbey ◽  
Fabien Thomas ◽  
Sandrine Hoppe
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dimethyl Sulfoxide ◽  
Polymer Matrix ◽  
Composite Films ◽  
Cassava Starch ◽  
X Ray ◽  
Clay Dispersion ◽  
Combined Use ◽  
Scanning Electron

Abstract In the present study, a combined use of photonic microscopy, scanning electron microscopy and 3D X-ray tomography is carried out in order to analyze the dispersion and the distribution of raw and dimethyl sulfoxide (DMSO)-intercalated kaolinite used as filler in cassava starch-based films. It is shown that the association of these techniques allows a valuable analysis of clay dispersion in polymer-clay composite films. In the case of kaolinite-starch composite films on which this study is focused, it is obvious that previous intercalation of kaolinite with DMSO is an efficient way to improve dispersion and distribution of kaolinite in a starch polymer matrix.

scholarly journals Synthesis of Zeolite A employing Amazon kaolin waste

Cerâmica ◽  
2015 ◽  
Vol 61 (360) ◽  
pp. 409-413 ◽  
Author(s):  
S. H. da Silva Filho ◽  
L. Bieseki ◽  
A. R. da Silva ◽  
A. A. B. Maia ◽  
R. A. S. San Gil ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Amorphous Materials ◽  
Mas Nmr ◽  
The Other ◽  
Zeolite A ◽  
X Ray Diffraction ◽  
X Ray ◽  
27Al Mas Nmr ◽  
Scanning Electron

Abstract The synthesis of zeolite A employing kaolin waste from paper coating was studied. The kaolin waste was pre-treated at 550 to 800 ºC. For comparison purposes, a sample of zeolite A was also prepared using the IZA procedure. The materials were characterized by 27Al MAS NMR, X-ray diffraction and scanning electron microscopy using a microprobe. Pretreatment was necessary, and the best temperatures were between 600 and 700 ºC. The zeolite A formation was observed in all the prepared materials, reaching 52% crystallinity. On the other hand, the sodalite phase and amorphous materials were also formed.

scholarly journals Влияние углеродных нанотрубок на электрические и механические свойства хитозановых пленок

2022 ◽  
Vol 92 (3) ◽  
pp. 435
Author(s):  
А.М. Камалов ◽  
В.В Kодолова-Чухонцева ◽  
E.Н Дресвянина ◽  
T.П Масленникова ◽  
И.П Добровольская ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrical Conductivity ◽  
Scanning Electron Microscopy ◽  
Composite Films ◽  
X Ray Diffraction ◽  
Electronic Components ◽  
Electrical Field ◽  
Field Frequency ◽  
X Ray ◽  
Scanning Electron

Using the methods of X-ray diffraction and scanning electron microscopy, the structure of composite films based on chitosan and single-wall carbon tubes has been studied. It is shown that the introduction of carbon nanotubes leads to the ordering of the chitosan structure. Increase in concentration of nanotubes (from 0 to 3%) causes rise in the value of storage modulus from 3 to 4 GPa (DMA data), increase in electrical conductivity of samples (from 10-11 to 102 S/m), and some changes in their dielectric permittivity (from 5.5. to 26 at an electrical field frequency of 1kHz). Data on the ionic and electronic components of the conductivity of the composite film are presented.

Hydrothermal Synthesis of Zeolite a Using Non-Calcined Diatomite

2018 ◽  
Vol 930 ◽  
pp. 3-7 ◽  
Author(s):  
Alexandre Fontes Melo de Carvalho ◽  
Tiago Roberto da Costa ◽  
Gilvan Pereira de Figueredo ◽  
José Antônio Barros Leal Reis Alves ◽  
Rodrigo César Santiago ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
Crystallite Size ◽  
Powder Diffraction ◽  
Average Crystallite Size ◽  
Zeolite A ◽  
X Ray ◽  
Prepared Sample ◽  
Scanning Electron

Optimization and reduction of zeolite A synthesis costs are the focus of several studies. Attention has been given to the use of residues and natural materials rich in Si and Al, such as diatomite. Diatomite needs to be calcined above 500°C to be used, which increases processing costs. This study aimed at evaluating the use of diatomite without calcination in preparing zeolite A. Alkaline hydrothermal synthesis melting and 24 h of crystallization were carried out. The materials were characterized by XRD (X-ray powder diffraction), XRF (X-ray fluorescence), BET (N2physisorption) and SEM (Scanning Electron Microscopy). XRD data and refinement show that the obtained material presents 99.84% crystallinity, average crystallite size of 54.92 nm, and a semi-quantitative percentage of 79% zeolite A. SiO2and Al2O3contents in the prepared sample proved the ratio SiO2/Al2O3= 2. The micrographies show cubic particles and agglomerated sodalite.

scholarly journals Synthesis of silver nanoparticles using marine macroalgae Padina sp. and its antibacterial activity towards pathogenic bacteria

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Prakash Bhuyar ◽  
Mohd Hasbi Ab. Rahim ◽  
Sathyavathi Sundararaju ◽  
Rameshprabu Ramaraj ◽  
Gaanty Pragas Maniam ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Marine Algae ◽  
Marine Alga ◽  
Ag Nps ◽  
X Ray ◽  
Uv Visible ◽  
Scanning Electron

Abstract Background Marine algae used as a food source for ocean life and range in color from red to green to brown grow along rocky shorelines around the world. The synthesis of silver nanoparticles by marine alga Padina sp. and its characterization were fulfilled by using UV-visible spectrophotometer, Fourier transform infrared spectroscopy, scanning electron microscopy and field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Results UV-visible absorption spectrum revealed that the formation of Ag nanoparticles was increased by the addition of marine algae and the spectral peak observed between a wavelength of ~ 420 nm and 445 nm. In addition, SEM and FESEM images examined the surface morphology and the size of the synthesized NPs was relatively uniform in size ~ 25–60 nm. Energy-dispersive X-ray spectroscopy analysis confirmed the purity of Ag NPs with atomic percentage of 48.34% Ag. The synthesized Ag NPs showed highly potent antibacterial activity. The Staphylococcus aureus and Pseudomonas aeruginosa were found to be more susceptible to silver nanoparticles by forming 15.17 ± 0.58 mm and 13.33 ± 0.76 mm of diameter of the inhibition zone, respectively. Conclusions The study suggested that marine alga Padina sp. could be an alternative source for the production of Ag nanoparticles and are efficient antimicrobial compounds against both gram-negative and gram-positive bacteria which can be a promising material against infectious bacteria.

Electrochemical Polymerization and Electrochromic Properties of Poly(3-methoxythiophene)/NiO Composite Films

2012 ◽  
Vol 268-270 ◽  
pp. 45-48 ◽  
Author(s):  
Wen Ting Li ◽  
Ya Ting Wang ◽  
Xu Chun Song
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Electrochemical Polymerization ◽  
Composite Films ◽  
Prepared Film ◽  
X Ray ◽  
Electrochromic Properties ◽  
Polymerization Method ◽  
Scanning Electron

Poly(3-methoxythiophene)/NiO (PMOT/NiO) composite films were electrochemically synthesized on a ITO surface in the ionic liquid 1-butyl-3-metyllimidazolium hexafluorophosphate ([BMIM]PF6) by a potentiodynamic polymerization method. The PMOT/NiO composite films were characterized by energy-dispersive X-ray analysis(EDS) and scanning electron microscopy (SEM). Electrochemistry properties of the prepared film was characterized by cyclic voltammetry. Spectroelectrochemistry and electrochromic properties of the PMOT/NiO composite were characterized using various experiment techniques in [BMIM]PF6.

Preparation of Zeolite A from Natural Stellerite

2012 ◽  
Vol 624 ◽  
pp. 287-290
Author(s):  
Chun Ying Zhang ◽  
Nan Chun Chen ◽  
Xiao Hu Zhang ◽  
Quan Tang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrochloric Acid ◽  
Crystallization Time ◽  
Zeolite A ◽  
X Ray Diffraction ◽  
X Ray ◽  
End Products ◽  
Ft Ir ◽  
Scanning Electron

Zeolite A was prepared from natural stellerite under hydrothermal conditions.The experiments were carried at different crystallization temperatures and times，the experimental results and synthetical factors were analyzed and researched. The end products have been characterized by using FT–IR, X–ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that zeolite A was synthesized on the condition of the crystallization temperature at 90~100°C and the crystallization time for 6 hours with 15% hydrochloric acid of stellerite modifying，according to certain proportion of stellerite.

Influence of Temperature and Alkaline Activation for Synthesis Zeolite A from Natural Kaolin

2017 ◽  
Vol 751 ◽  
pp. 410-416 ◽  
Author(s):  
Pimpreeya Thungngern ◽  
Phanwatsa Amnaphiang ◽  
Panuruj Asawaworarit ◽  
Vituruch Goodwin ◽  
Nuwong Chollacoop ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Second Step ◽  
Zeolite A ◽  
X Ray Diffraction ◽  
Hydrothermal Technique ◽  
Influence Of Temperature ◽  
Alkaline Activation ◽  
X Ray ◽  
Scanning Electron

Zeolite A from natural kaolin have been successfully synthesized via calcination and hydrothermal. However, these techniques have one drawback since, the impurities in kaolin such as muscovite and quartz in the kaolin structure, which depend on temperature and alkaline activation. This work was separated into two steps, first step was used calcination technique, and second step was used hydrothermal technique. Reaction of temperature in the first step was studied the influence of temperature from 500°C to 800°C for 3 hours. In this step, kaolin transformed to metakaolin and remain the impurities. Next, reaction of alkaline activation in second step was studied about the influence of NaOH. The concentration of NaOH in hydrothermal was varied from 1M to 4M and mixed with metakaolin at 90°C for 72 hours. X-ray Diffraction Spectroscopy (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) were used for characterization. The solid products were formed to zeolite A at 1M NaOH hydrothermal with 500°C to 800°C calcination and it can be seemed good of euhedral structure at 700°C

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

Scanning Electron Microscopy and X-Ray Analyses of Dental Tissues from a Hibernator

1976 ◽  
Vol 34 ◽  
pp. 178-179
Author(s):  
M. L. Zimny ◽  
A. C. Haller
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Body Temperature ◽  
Ground Squirrel ◽  
Alveolar Bone ◽  
X Ray ◽  
Dental Tissues ◽  
Bone Minerals ◽  
Apical Tooth ◽  
Scanning Electron

During hibernation the ground squirrel is immobile, body temperature reduced and metabolism depressed. Hibernation has been shown to affect dental tissues varying degrees, although not much work has been done in this area. In limited studies, it has been shown that hibernation results in (1) mobilization of bone minerals; (2) deficient dentinogenesis and degeneration of alveolar bone; (3) presence of calculus and tears in the cementum; and (4) aggrevation of caries and pulpal and apical tooth abscesses. The purpose of this investigation was to study the effects of hibernation on dental tissues employing scanning electron microscopy (SEM) and related x-ray analyses.

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