Mono-Size Distribution Index (MSDI): A new criterion for the quantitative description of size distribution
Hamid
Moghadam
Department of Chemical Engineering, University of Sistan and Baluchestan, Zahedan, Iran
author
Mozhgan
Zakeri
Department of Chemical Engineering, University of Sistan and Baluchestan, Zahedan, Iran
author
Abdolreza
Samimi
Department of Chemical Engineering, University of Sistan and Baluchestan, Zahedan, Iran
author
text
article
2019
eng
Graphical size distribution is widely used in different fields of science and studies related to powders, droplets, bubbles, and pores. However, in some condition it may also be necessary to express the size distribution quantitatively. In spite of there being several suggested ways to quantify size distribution in the literature, some of these approaches are not applicable for many methods and the rest have other drawbacks. In this study, first, some quantitative size distribution methods (such as the polydispersity index) and their defects are concisely discussed. SPAN seems to be the most generally appropriate method, its parameters are determined from cumulative size distribution data. Nevertheless, some specific results imply that there are still some drawbacks in this method. Next, a new quantitative description of size distribution is presented which is applicable to many different techniques. In this method the characterization value is limited to 0 and 1, where 0 is related to completely polydispersed size distribution and 1 denotes the completely monodispersed size distribution.
Journal of Particle Science and Technology
Iranian Research Organization for Science and Technology
2423-4087
5
v.
2
no.
2019
71
76
https://jpst.irost.ir/article_832_23144179eeed751f6233906e8fa0f8f6.pdf
dx.doi.org/10.22104/jpst.2019.3455.1144
Iranian natural zeolite particle modification: Green synthesis, characterization, and oil spill remediation
Shohreh
Saffarzadeh-Matin
Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
author
Maryam
Khandan
Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
author
Anvar
Shalmashi
Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
author
text
article
2019
eng
In the present work, Iranian natural zeolite particles (NZ) as an abundant and low-cost resource were modified by chemical covalent attachments of commercially available stearic acid (SA) with tunable hydrophobic/hydrophilic properties. The versatile, simple, and green technique of mechanogriding was performed for the hydrophobic derivatisation of NZ. The NZ and as-prepared modified particles were thoroughly characterized by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), powder X-ray diffraction (XRD), thermogravimetric analysis (TGA), Brunauer-Emmett-Teller (BET), Barret-Joyner-Halenda (BJH), and static water contact angle (WCA) measurements. TG-DTA results revealed the high thermal stability of the modified sample up to 490°C. The flake-like structures of functionalized NZ were discrete and no longer aggregated due to modification. The absorbing function of the modified NZ was evaluated by its removal of oil from a stable crude oil emulsion in water.
Journal of Particle Science and Technology
Iranian Research Organization for Science and Technology
2423-4087
5
v.
2
no.
2019
77
90
https://jpst.irost.ir/article_833_6db74c12c3809408877f0d6bec5664a6.pdf
dx.doi.org/10.22104/jpst.2019.3517.1146
Point and interval evaluation of nanoparticles censored sample in the spray process
Hanieh
Panahi
Department of Mathematics and Statistics, Lahijan branch, Islamic Azad University, Lahijan, Iran
author
Saeid
Asadi
Department of Mechanical Engineering, Payame Noor University (PNU), Tehran, Iran
author
text
article
2019
eng
A good nano coating depends on the quality of the collision and spreading behavior of the nanoparticles. Unfortunately, in many cases, nanoparticle spreading data has not been recorded. In this paper, we have extended the evaluation model to predict the unavailable or censored maximum spreading diameter of nanoparticle data. Different point and interval methods have been considered for this problem. Choosing Bayesian evaluation, the Markov Chain Monte Carlo (MCMC) has been proposed as an efficient procedure for estimating the predictive inference for future observation. An important implication of the present study is that the censored maximum diameter data can be predicted well using the proposed methods. Results showed the proposed point predictions are close to real data, the predictive intervals contain the real values, and it verifies the applicability of the prediction techniques for real problems.
Journal of Particle Science and Technology
Iranian Research Organization for Science and Technology
2423-4087
5
v.
2
no.
2019
91
99
https://jpst.irost.ir/article_864_60d061dab098c5631d1e13c189208c5a.pdf
dx.doi.org/10.22104/jpst.2019.3437.1143
Composite processing and study of properties for polypropylene EPD60R/modified nanoclay Cloisite® 15A
Ali
Farahani
Department of Chemical Engineering, Borujerd Branch, Islamic Azad University, Borujerd, Iran
author
Arsalan
Parvareh
Chemical Engineering and Petroleum Faculty, Razi University, Kermanshah, Iran
author
Mostafa
Keshavarz Moraveji
Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
author
Davood
Soudbar
Shazand Petrochemical Company Research and Development Unit, Arak, Iran
author
text
article
2019
eng
The effects of adding nanoclay to improve the thermal and mechanical properties of polypropylene (PP) copolymers grade (EPD60R) used in the pipe industry were investigated. To improve the dispersion of the nanoclay in the polymeric matrix, a 30 wt% of nanoclay master batch was first prepared by mixing PP matrix maleic anhydride PP oligomer (PP-g-MA) and Cloisite® 15A (C15A) nanoclay. The prepared master batch was used to produce nanocomposites with 2 and 5 wt% nanoclay. The nanocomposites were analyzed by XRD (X-ray diffraction), SEM (Scanning electron microscopy), DSC (Differential scanning calorimetry), TGA (Thermogravimetric analysis), and other mechanical tests. The XRD and SEM results indicated the occurrence of an intercalated layer structure in the nanocomposites. Thermal properties of the nanocomposites were investigated using DSC and TGA tests. The crystallinity of the 2 wt% nanoclay was improved by about 59.23% in the nanoclay reinforced samples. As the content of nanoclay increased, the composite exhibited higher thermal degradation temperature. Performing a limiting oxygen index (LOI) test on the samples showed that the addition of nanoclay to the EPD60R matrix increased the flame retardancy by 12.58%. The tensile modulus of the nanocomposites was improved compared to the pure polymer, while the elongation at break and at yield showed a reduction. To investigate the nanocomposite in pipe application, a pipe (external diameter 110.8 and thickness 3.65 mm) was manufactured in a special tube extruder machine with 2 wt% of C15A. Tests of the tube’s physical and mechanical properties indicated that its ring stiffness increased by 25% compared to the pure PP.
Journal of Particle Science and Technology
Iranian Research Organization for Science and Technology
2423-4087
5
v.
2
no.
2019
101
108
https://jpst.irost.ir/article_865_b51d7f2a6f96dea22c6e1acff8ddd48a.pdf
dx.doi.org/10.22104/jpst.2019.3580.1148
Ultrasonic synthesis of Zn(II) methionine and ZnO nanostructures as a new precursor for ZnO nanoparticles and in-vitro study
Rouzbeh
Aghaei Hakkak
Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
author
Maryam
Ranjbar
Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
author
Sara
Mirzaie
Department of Agriculture, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
author
text
article
2019
eng
Zinc(II) ions play a special role in biological systems. Methionine is a sulphur containing amino acid with IUPAC name 2-amino-4-(methylthio)butanoic acid. In this study, ultrasonic synthesis and characterization of nanostructured Zn(II) methionine (Zn-Meth) in two different solvents were investigated. The reaction of ZnCl2 and methionine ligand under ultrasonic irradiation in both methanol and DMSO leads to the formation of nano-sized Zn(II) methionine complexes. Characterization of the Zn(II) complex was performed using elemental analysis, FT-IR spectroscopy, X-ray powder diffraction (XRD), thermal gravimetry (TGA), field emission scanning electron microscopy (FE-SEM), and energy-dispersive X-ray spectroscopy (EDS). The nano Zn-Meth complex, [Zn(CH3SCH2CH2CHNH2COOH)2]n, was then used as a precursor to obtaining the nano ZnO particle. An in-vitro study of the everted gut sac was also done on this complex to measure the uptake amount of zinc. The results showed that the nano-sized Zn-Meth has a higher absorption compared to its commercial and inorganic forms.
Journal of Particle Science and Technology
Iranian Research Organization for Science and Technology
2423-4087
5
v.
2
no.
2019
109
116
https://jpst.irost.ir/article_884_c9f4efb1fab102edb79d8c1b404b1c27.pdf
dx.doi.org/10.22104/jpst.2019.3551.1147
X-Shaped Thallium oxide nanostructures as a high performance photocatalyst for degradation of Cephalexin
Arezo
Mohammadkhani
Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran
author
Azar
Bagheri GH
Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran
author
Saeed
Rayati
Department of Chemistry, K. N. Toosi University of Technology, Tehran, Iran
author
text
article
2019
eng
In this study, we present an approach to synthesize Tl2O3 nanoparticles using a simple co-precipitation method that leads to the formation of X-shaped particles. The sample was characterized by XRD measurements, field emission scanning electron microscopy (FESEM), diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR), and ultraviolet-visible (UV-VIS). The absorption spectrum of the sample showed that the optical band gap was 3.5 eV. The prepared photocatalyst was used in the photocatalytic degradation of Cephalexin (CPX) using irradiation, and the optimum parameters that were obtained were 0.2 g.L-1 of the photocatalyst at pH 5.5 and an irradiation time of 15 minutes.
Journal of Particle Science and Technology
Iranian Research Organization for Science and Technology
2423-4087
5
v.
2
no.
2019
117
122
https://jpst.irost.ir/article_885_5f7bdb4e2fc790c1cc6c76e809721af4.pdf
dx.doi.org/10.22104/jpst.2019.3610.1149