eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
1
14
10.21608/ejchem.2018.4309.1389
11292
Original Article
Application of Some Polymer latexes in Preventing Paper Documents Forgery
Mohamed B. Gazy
1
Waleed K. El-Zawawy
2
Alaa E. Elsayed
3
Taha M. A. Eldebss
4
Mohamed R. Helal
5
Khaled Rashed
khaledrashed178@yahoo.com
6
Chemistry Department, Faculty of Science, Al-Azhar University , Cairo, Egypt
Cellulose and paper Department, National Research Center, Giza, Egypt
Polymers and Pigments Department, National Research Center, Giza., Egypt
Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
Forensic Medicine Authority, Ministry of Justice ,Cairo, Egypt
Forensic Medicine Authority, Ministry of Justice ,Cairo, Egypt
The main objective of this research is to improve ink printability of papers via their modification with various types of water-based polymer latexes during paper manufacturing process. In order to achieve this target, various types of styrene-acrylate polymer latexes were used for modification of different types of papers. Styrene-acrylate latexes were prepared via emulsion polymerization of styrene with various acrylate monomers using emulsion polymerization technique. The effect of different emulsifying agents on the properties of the prepared emulsions was studied. The obtained results showed a significant improvement in degree of gloss and ink density on the polymer-coated papers which positively affect the ink ability, and ink holding properties of the modified paper. In addition, ink gloss and ink density of the coated papers improved with increasing the concentration of modifying latexes containing Texapon®P as emulsifier. These promising results open the way to use polymer latexes in treatment of documented value which can be used in stabilization of disappearing ink on paper leading to prevent forgery
https://ejchem.journals.ekb.eg/article_11292_a03b8a94f24e124267b5f7bcfaa727c1.pdf
Coated paper
forgery
Erasable ink
Disappearing ink
Polymer latex
Physico-chemical properties
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
15
20
10.21608/ejchem.2018.3738.1327
11919
Original Article
Water Desalination Using Cellulosic Nano-filtration Membrane Composed of Nano-scale Polytetraflouroethylene
M.F. Shaaban
drmohamed727@gmail.com
1
Mohamed El-Khateeb
elkhateebcairo@yahoo.com
2
Mohamed Saad
dr.mmasaad@gmail.com
3
Textile Research Division, National Research Centre, Dokki, Giza, Egypt.
Water Pollution Control Dep., National Research Center, Dokki, Cairo, Egypt
Textile Research Division, National Research Centre, Dokki, Giza, Egypt.
This study deals with the preparation and characterization of Nanofiltration cellulose acetate-based membranes and their application in desalination of brackish water. Cellulose acetate nanofiltration (CA-NF) membranes were prepared using phase inversion process. Pore size of the prepared membrane was checked via dope solutions of different polymer concentrations (wt. %) and treatment temperatures from 60-90°C. followed by casting the membrane on Polytetraflouroethylene sheets (PTFE) and examining the efficiency of the product. Characterization of the prepared membrane was carried out utilizing scanning electron microscopy (SEM). The work was extended to study the hydraulic permeability, water permeation as well as salt rejection percentage. Characterization of the prepared membrane will be carried out utilizing scanning electron microscopy (SEM), the hydraulic permeability, water permeation as well as salt rejection percentage. Results indicated that CA membranes reinforced with (PTFE) gave better efficiency than normal CA membranes.
https://ejchem.journals.ekb.eg/article_11919_fa141decd7f702baacbd16adf1ed1b2c.pdf
Desalination
nanofiltration
cellulose derivatives
phase inversion process
membrane
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
21
28
10.21608/ejchem.2018.4577.1403
11269
Original Article
Phenolic Content as Antioxidant and Antimicrobial Activities of Pistacia atlantica Desf. (Anacardiaceae) Extract from Libya
Salma.O. K. Othman
1
Maher.A. El-Hashash
2
Sahar Hussein
drsahar90@yahoo.com
3
Amani M.D. El-Mesallamy
4
Sameh. A. Rizk
5
Fakhri A. Elabbar
6
Department of Chemistry, Faculty of Science, Sebha University, Sebha, Libya
Department of Chemistry, Faculty of Science ,Ain-Shams University, Cairo, Egypt
Department of Phytochemistry and Plant Systematics;National Research Centre,Cairo, Egypt
Department of Chemistry, Faculty of Science, Zagazig University, Zagazig ,Egypt.
Department of Phytochemistry and Plant Systematics;National Research Centre,Cairo, Egypt
Department of Chemistry, Faculty of Science, Benghazi University, Benghazi, Libya
The aim of the work is to search for new, potentially biologically active extract .The chemical and biological investigations of different extracts of P. atlantica, resulted that the ethyl acetate extract of P. atlantica leaves contains a complicated mixture of phenolics, which includes mainly gallotannins as previously detected by 2D paper chromatographic screening. The isolation and identification of six polyphenoles (1-6) , were elucidated for the first time from this plant , including three polyphenolic acid ; gallic acid (1); ellagic acid (2) ; 3,3'-dimethoxyellagic acid (3) and three gallotannines, 2,3-di-O-galloyl-(α/β)-4C1-glucopyranose, nilocitin (4) ; 1,3-di-O-galloyl-β-D-4C1-glucopyranos (5); 1,2,3,4,6- penta-O-galloyl-b-D-4C1-glucopyranose(6).The structures of all isolated compounds were elucidated by conventional methods, spectroscopic analysis, including 1D and 2DNMR,ESIMS and HRESI mass as well. The search for new, potentially biologically active extract becomes much more efficient after identification of all compounds in that mixture. The in vitro antioxidant activity using the stable free radical DPPH (2,2-diphenyl-1-pycrylhydrazyl) method of the P. atlantica extracts proved that ethyl acetate extract possesses a distinct radical scavenging effect at the different concentrations and the extract completely inhibited DPPH absorbance at a concentration 77 μl , the percentage of inhibition obtained 96.4% can be considered as a full absorbance inhibition of DPPH . Also, the IC50 (the concentration that inhibits 50% of the absorbance of DPPH) of ethyl acetate extract of P. atlantica showed an IC50 value of 8.41±0.24 μg/ml compared with IC50 value of ascorbic acid 1.82±0.33 μg/ml. It could be concluded from the obtained results that the P. atlantica ethyl acetate extract shows a very high antioxidant capacity which is very close to the value of the reference standard used, which may be attributed to its high polyphenolic content. P. atlantica extracts demonstrated inhibitory effects against pathogenic microorganisms: Staphylococcus aureus, NCTC 7447; Bacillus subtilis, NCTC 10400; Escherichia coli, NCTC 10416; Pseudomonas aerogenasa NCIB 9016); Candida albicans, IMRU 3669.The active ethyl acetate extract shown a sensitizing effect against Staphylococcus aureus ,20mm inhibition zone while the methanolic extract effect against Bacillus Subtilis was 19.5mm inhibition zone.The present study has revealed that Pistacia Atlantica Desf. (Anacardiaceae) growing in Libya is capable of synthesizing and accumulating different types of phenolics, including mainly ellagitannins, gallotannins which were elucidated for the first time from this plant .It could be concluded from the obtained results that the P. atlantica is a promising source for bioactive compounds which have potential applications as bioactive antioxidant agents for the treatment of diseases
https://ejchem.journals.ekb.eg/article_11269_697c07aa2d32b2f112eeb3d07eb8493c.pdf
Pistacia atlantica Desf.(Anacardiaceae) ,Phenolics, gallotannines, NMR spectroscopy
antioxidant DPPH, antimicrobial activity
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
29
48
10.21608/ejchem.2018.4284.1382
13449
Review Improvement of Polypropylene Properties by Irradiation/Grafting and Other Modifications
Samiha Gawish
smgawish@yahoo.com
1
Sayeda Mosleh
h.mosleh1959@yahoo.com
2
Ameera Ramadan
ramadanam2000@yahoo.com
3
Textile Research Division, National Research Cetre
Textile Division ,,National Research Centre, Dokki, Cairo
Textile Division , National Research Centre ,Dokki, Cairo Egypt
In Egypt, at Port-Said there is a great company producing polypropylene chips from propylene gas ( and a catalyst) , a product of petroleum. These are melt spinning into yarns to produce woven or non - woven fabrics. Polypropylene (PP) is a cheap fabric, bearing chemical resistance and excellent mechanical properties . PP is hydrophobic in nature , inactive synthetic fabric due to the absence of reactive functional groups in the molecular structure, thus preventing its dyeing For this reason , PP fibers are modified by irradiation methods to form free radical centers onto the surface and graft selected vinyl monomers . Different irradiation techniques are adopted involving plasma discharge, electron beams , ozone , UV, γ- rays and other modifications. PP is grafted with selected monomers including methacrylate derivatives such as ( 2N -Dimethyl amino ethyl methacrylate ,2N morpholino ethyl methacrylate , 2- ethyl methacrylate phosphoric acid , methyl methacrylate, 2- hydroxy ethyl methacrylate ) acrylic acid , styrene , chloro methyl styrene , vinyl acetate etc... The different variable factors affecting PP irradiation and grafting reactions are considered such as irradiation dose , storage time of irradiated fabric , monomer concentration , reaction time and temperature . Physical properties of grafted PP are studied for those containing tertiary amino or quaternized groups which improved the increase of moisture regain , melting point and enhancement affinity to dyeing by different classes of dyestuffs. Other important properties improvement include ion exchange capacity electrical conductivity , antistatic, insect repellent activity an antibacterial property . PP containing Ag, Zn, ZnO, TiO2 , Cu2O nano particles are antibacterial fabrics which are used as wound healing dressings.
https://ejchem.journals.ekb.eg/article_13449_70ca5105604d74a013a35c39b4d2310c.pdf
: Polypropylene
Irradiation
grafting
antistatic antibacterial
insect repellent and ion -exchanger properties
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
49
62
10.21608/ejchem.2018.4943.1448
17869
Improvement of Polypropylene (PP) Dyeing by Modification Methods
Samiha Gawish
smgawish@yahoo.com
1
Ameera Ramadan
ramadanam2000@yahoo.com
2
Sayeda Mosleh
h.mosleh1959@yahoo.com
3
Textile Research Division, National Research Cetre
Textile Division , National Research Centre ,Dokki, Cairo Egypt
Textile Division ,,National Research Centre, Dokki, Cairo
Polypropylene fabrics are important for the woven or nonwovens market. PP fabrics have wide applications in our life . PP are difficult to be dyed by conventional dyeing methods , since they have no reactive functional groups in their chemical structure. For the above reasons , PP fabrics are modified by different methods including the following: I- Blending PP chips with other polymers with different ratios of PTT, PE, PA,EVA, PET,PS etc..prior or during melt extrusion . II-Dyeing PP using disperse dyes in superfacial carbon dioxide . III- Mass coloration of PP by melt extrusion with organic , inorganic pigments or metallic additives . V- Modification of PP by radio- grafting technique. IV- Dyeing PP by or other means .
https://ejchem.journals.ekb.eg/article_17869_17f7bbf07ae08a37823c58d7f60f1cd1.pdf
PP fabrics
PP modification
blending PP
dyeing in S- CO 2 mass coloration
Pigments
chlorination
Disperse dyes
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
63
76
10.21608/ejchem.2018.4154.1375
13446
Original Article
Effect of different surfactant monomers on alkali soluble emulsion polymer as a binder for water based printing inks
Elsayed S. Saad
1
A. M. Nasser
2
H. Abd El-Wahab
3
Waseam A. Hassan
4
Alaa Elsayed
alaaeldesoky.pa@gmail.com
5
EBCA R&D Polymer Center, Egyptian British Co. for Chemicals and Auxiliaries, Egypt.
Chemistry Department, Faculty of Science, Al-Azhar University, Cairo, Egypt.
Chemistry Department, Faculty of Science, Al-Azhar University, Cairo, Egypt.
EBCA R&D Polymer Center, Egyptian British Co. for Chemicals and Auxiliaries, Egypt.
Polymers & Pigments Department, National Research Center, Cairo, Egypt.
In this study hydrophobically alkali-soluble emulsion HASE was prepared by using semi batch emulsion polymerization technique and evaluated as a binder for water based printing inks. HASEwas prepared by using vinyl acetate and methyl methacrylate as hydrophobic monomers in addition to meth acrylic acid as a hydrophilic monomer. Besides, anionic and nonionic emulsifiers are used and sodium per sulfate as initiator. Three types of surfactant monomers are prepared by esterification of an acid or an anhydride with nonionic surfactant and then, the chemical structures were characterized using FT-IR spectroscopy. Each surfactant monomer was used in different ratios to prepare the emulsion polymer. However a sample without using of surfactant monomer was prepared for comparison. The prepared HASE was diluted and then neutralized by using mono ethanol amine till pH from 8 to 9. Neutralized polymer solution was mixed with pigment dispersion and then applied on paper sheet and color strength was measured. The best final polymer latex was characterized by FT-IR, DSC, and TEM. The prepared polymer showed advanced behavior compared with commercial binder in water based printing ink formulations. The results obtained revealed that uses of 5g of surfomer in polymerization of HASE enhance the color strength and gravimetric conversion and reduce the precipitate and viscosity.
https://ejchem.journals.ekb.eg/article_13446_2464e9aa195454b51617a4b060299a1f.pdf
Emulsion polymerization
alkali soluble emulsion
surfmer
Printing inks
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
77
83
10.21608/ejchem.2018.4828.1428
11920
Original Article
LC-ESI-MS Analysis, Antitumor and Antiviral Activities of Bosica senegalensis Aqueous Methanolic Extract
Ahmed ElKhateeb
elkhateeb.ahmed@gmail.com
1
Sameh Hussein
sameh_reda@hotmail.com
2
Maha Salem
maha_abdelmejed@yahoo.com
3
Sabry El Negoumy
sabryelnegomy@yahoo.com
4
National Research Center
National Research Center
National Research Center
National Research Center
Twenty one compounds (twelve flavonoids, four benzoylglucarate isomers, two phenolic acids, two glucosinolates, and one saccharide) were identified from the B. senegalensis aqueous methanolic extract using LC-ESI-MS technique. Among the identified compounds, quercetin-O-sinapoylglucoside-O-glucoside (13) and quercetin-di-O-benzoyl glucoside (16) are newly identified natural products.B. senegalensis aqueous methanolic extract showed strong inhibitory effect against H5N1 viruses and moderate antitumor activity against three carcinoma cell lines.
https://ejchem.journals.ekb.eg/article_11920_e0f23371d2848fbc71228fcd5917bf33.pdf
Boscia senegalensis
Capparaceae
LC-ESI-MS
antitumor
Antiviral
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
85
96
10.21608/ejchem.2018.4005.1351
13443
Original Article
Synthesis of Acrylate-Modified Cellulose via Raft Polymerization and Its Application as Efficient Metal Ions Adsorbent
Yasser Assem
dryasserassem@gmail.com
1
Ragab Abu-Zeid
ragab@yahoo.com
2
Korany Ali
kornykhlil@gmail.com
3
Samir Kamel
samirki@yafoo.com
4
National Research Centre
Cellulose and Paper Department, National Research Centre, 12622 Dokki, Giza, Egypt
Applied Organic Chemistry Department, National Research Centre, 12622 Dokki, Giza, Egypt
Cellulose and Paper Department, National Research Centre, 12622 Dokki, Giza, Egypt
Poly acrylic acid-co-methyl methacrylate was grafted via reversible addition fragmentation chain transfer polymerization to cellulose. The graft copolymer was characterized by FTIR spectrum, thermo gravimetric analyzer, and scanning electron microscope. The adsorption behavior of the grafted cellulose for Ca2+, Cu2+ and Pb2+ ions was investigated. The adsorption capacity was improved as the molar ratio of acrylic acid increased. The grafted cellulose showed good adsorption performance for Ca2+ ion with 97 % rather than Cu++ and Pb++. That revealed the adsorption process increased due to the increasing of the COOH group of acrylic acid, which improves the chelation activity of the grafted polymer.
https://ejchem.journals.ekb.eg/article_13443_978301723b4e8da5db7a184feab2672e.pdf
cellulose
Graft copolymer
Reversible Addition Fragmentation Chain Transfer (RAFT)
Adsorption
Heavy metals
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
97
108
10.21608/ejchem.2018.4249.1376
13447
Original Article
Molecular Engineering of D-π-A Based on 1,3-Dimethoxybenzene π Spacer for Dye-Sensitized Solar Cells
Walid Sharmoukh
walidm@kth.se
1
Zeinab M. Hassan
2
Basant A. Ali
3
Mohamed M. Elnagar
4
Hanan A. Mousa
5
Ammar A. Labib
6
National Reseach Centre, Inorganic Chemsitry Department, Tahrir St, Dokki, 12622 Giza, Egypt
Fayoum University, Facult of Sciences, Chemistry Department, Egypt
Energy Materials Laboratory (EML), School of Sciences and Engineering, The American University in Cairo, New Cairo 11835, Egypt,
National Reseach Centre, Inorganic Chemsitry Department, Tahrir St, Dokki, 12622 Giza, Egypt
National Reseach Centre, Inorganic Chemsitry Department, Tahrir St, Dokki, 12622 Giza, Egypt
National Reseach Centre, Inorganic Chemsitry Department, Tahrir St, Dokki, 12622 Giza, Egypt
A new organic sensitizer incorporating D35 as a donor unit, 1,3-dimethoxybenzene as a new π- linker and cyanoacrylic acid as an acceptor, that can be anchored to the TiO2 surface, was designed and synthesized. The photophysical and electrochemical properties, as well as photovoltaic performance based on cobalt (II/III) electrolyte, have been studied to evaluate the impact of the new π- linker. The geometrical configuration of the sensitizer was optimized by density functional theory (DFT) calculations to gain a deep insight into the molecular structure and the electronic properties. Photovoltaic measurements of the present sensitizer in a DSSC configuration was found to show JSC = 4.0 mA cm−2, VOC = 610 mV, FF = 0.53 and η = 1.3% under standard AM 1.5 G illumination.
https://ejchem.journals.ekb.eg/article_13447_f82b3eb7a1685021641a3ae4ae7c4ce1.pdf
Photosensitizers
cobalt electrolyte
TD-DFT
DSSC
π- linker
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
109
117
10.21608/ejchem.2018.4555.1399
11268
Original Article
Impact of the Fabrication Parameters on the Performance of Embroidered E-clothes
Eman Swielam
emanswielam@gmail.com
1
Samiea Eltopshy
dr_samiaeltopshy@yahoo.com
2
Sania Sobhy
dr_saniakamies@yahoo.com
3
Z. M. Abdel-megied
z_algory@yahoo.com
4
Ahmad Labeeb
ahmad.m.labeeb@gmail.com
5
Clothing & Knitting Industrial Research Department, Textile Research Division, National Research Centre, Giza, Egypt
Clothes & Textile Department, Faculty of Home Economics, Helwan University, Egypt
Clothes & Textile Department, Faculty of Home Economics, Helwan University, Egypt.
Clothing & Knitting Industrial Research Department, Textile Research Division, National Research Centre (NRC), Giza, 12622, Egypt
Microwave Physics and Dielectrics, Physics Research Division, National Research Centre (NRC), Giza, 12622, Egypt
The research was conducted to apply the embroidering technique of fabricating e-textiles. Two types of conductive threads (A1& A2) were used. Microstructure properties of conductive yarns were characterized by energy dispersive X-ray (EDX) and scanning electron microscopy (SEM). Embroidery process was done by computerized embroidery machine. The effects of embroidery parameters such as different stitch type, stitch length and number of embroidered conductive threads on embroidered lines resistance were compared. The best result of conductivity and coating uniformity was obtained when using the type (A1) of coated yarn in straight stitch type with 3 lines of thread with 5 mm stitch length. Due to its low value of resistance (R) 0.83 Ω, while the highest value was 10.66 Ω in the type (A2) conductive yarn in zigzag stitch type with 1 line of thread with 7 mm. stitch length. The A1 yarn type embroidered on a prototype T-shirt to be a connector between the temperature sensor and screen. This embedded system based on conductive thread could find possible application in medical applications: continuous and long-term monitoring of patients in a hospital environment
https://ejchem.journals.ekb.eg/article_11268_f077d893da0f3abb63d124978c69ba39.pdf
Smart Clothes
Conductive Yarn
Embroidery
Wearable Technology
EDX
SEM & E-textile
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
119
130
10.21608/ejchem.2018.2935.1251
13441
Original Article
Dyeing Properties of Wool Fibers Dyed with Rhubarb as Natural Dye via Ultrasonic and Conventional Methods
Najia Ali
aali_04@hotmail.com
1
Eman Elkatibe
eman411@yahoo.com
2
Riad Elmohamedy
ariadelmohamedy@yahoo.com
3
Sahar Nassar
nassarsahar@hotmail.com
4
Nagla Elshemy
nanaelshemy@hotmail.com
5
Department of Dyeing, Printing, and Auxiliaries, National Research Centre, Dokki 12311, Egypt.
Department of Proteinic and Man-made Fibres, National Research Centre, Dokki 12311, Egypt.
Plant Pathology Department, National Research Centre, Dokki 12311, Egypt.
Department of Dyeing, Printing, and Auxiliaries, National Research Centre, Dokki 12311, Egypt.
Department of Dyeing, Printing, and Auxiliaries, National Research Centre, Dokki 12311, Egypt.
THE utilization of ultrasonic waves in textile coloration processing possesses many hopeful advantages. Conventional method in dyeing processes consumes a large amount of dye and thermal energy. The dyeing processing is exclusively carried out at higher temperatures. Ultrasonic dyeing is a novel technique to save time, cost, energy and provides high value of dye uptake. The aim of this study was to investigate the dyeing behavior of pre-treated wool fibers with chitosan, then dyed with rhubarb as natural dye by conventional (Con) and ultrasonic (US) methods. Factors affecting the dye extraction and dyeing processes such as dye concentration, temperature, time as well as pH was studied. The results indicated that the pre-treated wool fibers with chitosan get higher color strength (K/S), and all over color fastness properties values if it compared with the untreated fibers. Pre-treated wool fibers can be dyed at lower temperaturesin ultrasonic method as compared with conventional method. In this study the antimicrobialactivity with some kinds of Bacteria and Fungi were verified. The results demonstrated that the pre-treated fibers exhibit higher inhibition percent than the untreated one. As a result, the utilization of ultrasonic waves in dyeing procedure helps to decrease the dyeing temperature, thereby reducing energy consumption and maintaining the extracted and dyeing quality.
https://ejchem.journals.ekb.eg/article_13441_6d32402ed0fc6206a53533b7f7dc6d16.pdf
Rhubarb natural dye
Wool fibers
Chitosan
Ultrasonic energy
conventional
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
131
139
10.21608/ejchem.2018.3842.1374
13442
Original Article
Superhydrophobic Coating Polymer/Silica Nanocomposites: Enhancing Water Vapor Barrier Properties of Packaging Paper with Ultra-Thin PS/silica nanocomposite polymer Coating
Saber Ibrahim
saberam2000@yahoo.com
1
Maha Sultan
mahasultan21@yahoo.com
2
Packaging Materials Department, National Research Centre, Cairo, Egypt.
Packaging Materials Department, National Research Centre, Cairo, Egypt.
Regardless, the advantages of packaging paper and paperboards they lose their marketing share to the plastics because of their inadequate barrier properties due to their porous structure. They have no resistance against gases, moisture, and vapors. For that reason, the aim of this study is imparting roughening to cellulose fiber surface by applying ultra-thin coating of PS /silica nanocomposite. The effect of hydrophobic coating on surface morphology (SEM), contact angel, water vapor permeability (WVP), water sorption isotherm, and mechanical properties were investigated. The maximum contact angel >120o was obtained at SiO2 nanoparticle concentration (4%). WVP results revealed remarkable sharp decline in WVP of coated paper compared with uncoated one with increasing coating thickness beyond ( 4% ) SiO2 nanoparticle content attained WVP (0.0003 g Pa-1 s-1 m-1) compared with uncoated sample (0.0126 g Pa-1 s-1 m-1 ). The sorption isotherm of PS/ silica nanocomposite coated paper results have been fitted using BET model. The curves exhibited the characteristic sigmoid-shaped type II isotherm. The monolayer water content values (M0) range between 0.00005 - 0.00280 g water/g dry film. The applied PS/silica nanocomposite on mechanical properties showed enhancement in each of burst, short span, tensile strength. However, roughness and elongation decreased further than (4%) SiO2 nanoparticle content.
https://ejchem.journals.ekb.eg/article_13442_d0598ef7e1448aac5a1cfe53e1af71f9.pdf
coating
packaging
Contact angel
Barrier properties
Water vapor permeability
Polymer composite
Water sorption isotherm
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
141
148
10.21608/ejchem.2018.4013.1352
13444
Original Article
Novel Photosynthesis of CeO2 Nanoparticles from Its salt with Structural and Spectral Study
Zaid Mahmoud
zaidhameed_91@yahoo.com
1
Omaima Emad Khalaf
2
Mohammed Alwan Farhan
3
Department of Chemistry, College of science, Diyala university, Iraq
Department of Chemistry, College of science, Diyala university, Iraq
Department of Chemistry, College of science, Diyala university, Iraq
The nanoparticles of cerium oxide were synthesized using the novel photolysis method. The nanoparticles characterized by X-ray diffraction (XRD), UV-Visible spectroscope (UV-Vis), transmission electron microscope (TEM), scanning electron microscope (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Photoluminescence spectrum (PL). The size and structure of nanoparticles were obtained from (XRD) and found to be 13nm and cubic structure. The results from (TEM) and (SEM) showed agglomeration of particles and it in nano size. Strong peak at 296nm appeared when using UV-Vis while six emission peaks showed from PL spectrum. The dielectric properties of nanoparticles were studied for different frequency and showed a decrease it with increased frequency.
https://ejchem.journals.ekb.eg/article_13444_abe9f02668a636218980725aa96bb8c8.pdf
PL spectrum
Nanoparticles
photolysis
emission peaks
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
149
156
10.21608/ejchem.2018.4056.1354
13445
Original Article
Removal of Heavy Metal Ions Using Polystyrene Nanocomposite Thin Films
Mashael Alshabanat
ma.naif@hotmail.com
1
Department of Chemistry, Faculty of Science, Princess Nourah bint Abdulrahman University
Polymer nanocomposite thin films consisting of polystyrene and furnace carbon black were prepared in this study as adsorbent materials for the removal of heavy metals from industrial wastewater. The film properties were characterized, and the effect of carbon content in the nanocomposite, initial concentration, separation time, and pH on the removal efficiency were investigated. The optimal operating conditions were 120 min of separation time at pH 6 with a carbon content of 15 wt%. The adsorption equilibrium data and adsorption kinetics are also described herein. The Freundlich model best fit the equilibrium data, and the adsorption rate followed pseudo second-order kinetics.
https://ejchem.journals.ekb.eg/article_13445_d5463d2d1cbbe69393a54e974c7a8991.pdf
Removal
Polymer nanocomposite
pollution
Thin film
eng
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
2019-01-01
62
1
157
170
10.21608/ejchem.2018.4387.1391
13450
Original Article
The Use of Two Novel Maleanilinic Acid Indicators in Ground Water Analyses Applying UV-Vis Spectra and Atomic Spectrometry and Biological Studies of These Derivatives
mohamed Zayed
mazayed429@yahoo.com
1
Azza Eladly
asama2004@yahoo.com
2
Department of chemistry, Faculty of Science, Cairo University (D.Sc. Anal.Chem.)
Science and Technology Center of Excellence, Military production, P. O. Box 3066, Elsalam II, Cairo, Egypt
In the present work novel para methyl, para methoxy maleanilinic acid derivatives; which were prepared by solvent free reaction between maleic anhydride and p- methyl and p- methoxy aniline derivatives in a good yield. The prepared two novel derivatives are successfully applied in this research as selective chromogenic analytes for spectrophotometric analysis of heavy metal cations in water samples. Simple, accurate, precise, sensitive and pH-selective visible spectrophotometric method has been developed and validated for the direct determination of iron (III) and chromium (III) in pure and/ or environmental samples. These selected indicators are successfully applied for the analysis of Fe (III) and Cr (III) in water samples collected from regional wells in El-Beheira governorate. The obtained results are compared with the data obtained by atomic absorption of these metal cations in the same wells; which indicate great correlation between the two techniques. This correlation refers to the validation of the suggested spectrophotometric procedures in environmental analysis. These indicators are also tested against some kinds of bacteria, fungi and cancer cells. These possess great activities towards different kinds of bacteria and cancer cells. The obtained results in this research indicate that; the two prepared novel maleanilic acid derivatives are successfully applied in environmental analyses and health applications.
https://ejchem.journals.ekb.eg/article_13450_85c511c3e2c0dad605200a9c9a049a9c.pdf
Keywords: N-maleanilic acid Indicators
atomic absorption
Iron (III) Chromium (III)
River Nile water analysis
Health applications