oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

4 ( 1 )

2020 ( 5 )

2019 ( 265 )

2018 ( 359 )

Custom range...

Search Results: 1 - 10 of 179695 matches for " B Z Azmi. Amir Reza Sadrolhosseini "
All listed articles are free for downloading (OA Articles)
Page 1 /179695
Display every page Item
Preparation of silver nanoparticles in virgin coconut oil using laser ablation
Reza Zamiri,B Z Azmi. Amir Reza Sadrolhosseini, et al
International Journal of Nanomedicine , 2011, DOI: http://dx.doi.org/10.2147/IJN.S14005
Abstract: eparation of silver nanoparticles in virgin coconut oil using laser ablation Original Research (7102) Total Article Views Authors: Reza Zamiri,B Z Azmi. Amir Reza Sadrolhosseini, et al Published Date January 2011 Volume 2011:6 Pages 71 - 75 DOI: http://dx.doi.org/10.2147/IJN.S14005 Reza Zamiri1, B Z Azmi1,2, Amir Reza Sadrolhosseini1, Hossein Abbastabar Ahangar3, A W Zaidan1, M A Mahdi4 1Department of Physics, 2Advanced Materials and Nanotechnology Laboratory, 3Department of Chemistry, 4Wireless and Photonics Networks Research Center, Universiti Putra Malaysia, Serdang, Selangor, Malaysia Abstract: Laser ablation of a silver plate immersed in virgin coconut oil was carried out for fabrication of silver nanoparticles. A Nd:YAG laser at wavelengths of 1064 nm was used for ablation of the plate at different times. The virgin coconut oil allowed formation of nanoparticles with well-dispersed, uniform particle diameters that were stable for a reasonable length of time. The particle sizes and volume fraction of nanoparticles inside the solutions obtained at 15, 30, 45 min ablation times were 4.84, 5.18, 6.33 nm and 1.0 × 10-8, 1.6 × 10-8, 2.4 × 10-8, respectively. The presented method for preparation of silver nanoparticles in virgin coconut oil is environmentally friendly and may be considered a green method.
Preparation of silver nanoparticles in virgin coconut oil using laser ablation
Reza Zamiri,B Z Azmi. Amir Reza Sadrolhosseini,et al 
International Journal of Nanomedicine , 2011,
Abstract: Reza Zamiri1, B Z Azmi1,2, Amir Reza Sadrolhosseini1, Hossein Abbastabar Ahangar3, A W Zaidan1, M A Mahdi41Department of Physics, 2Advanced Materials and Nanotechnology Laboratory, 3Department of Chemistry, 4Wireless and Photonics Networks Research Center, Universiti Putra Malaysia, Serdang, Selangor, MalaysiaAbstract: Laser ablation of a silver plate immersed in virgin coconut oil was carried out for fabrication of silver nanoparticles. A Nd:YAG laser at wavelengths of 1064 nm was used for ablation of the plate at different times. The virgin coconut oil allowed formation of nanoparticles with well-dispersed, uniform particle diameters that were stable for a reasonable length of time. The particle sizes and volume fraction of nanoparticles inside the solutions obtained at 15, 30, 45 min ablation times were 4.84, 5.18, 6.33 nm and 1.0 × 10-8, 1.6 × 10-8, 2.4 × 10-8, respectively. The presented method for preparation of silver nanoparticles in virgin coconut oil is environmentally friendly and may be considered a green method.Keywords: silver nanoparticles, laser ablation, virgin coconut oil
Fabrication of Silver Nanoparticles Dispersed in Palm Oil Using Laser Ablation
Reza Zamiri,Azmi Zakaria,Hossein Abbastabar Ahangar,Amir Reza Sadrolhosseini,Mohd Adzir Mahdi
International Journal of Molecular Sciences , 2010, DOI: 10.3390/ijms11114764
Abstract: In this study we used a laser ablation technique for preparation of silver nanoparticles. The fabrication process was carried out by ablation of a silver plate immersed in palm oil. A pulsed Nd:YAG laser at a wavelength of 1064 nm was used for ablation of the plate at different times. The palm oil allowed formation of nanoparticles with very small and uniform particle size, which are dispersed very homogeneously within the solution. The obtained particle sizes for 15 and 30 minute ablation times were 2.5 and 2?nm, respectively. Stability study shows that all of the samples remained stable for a reasonable period of time.
Physical Properties of Normal Grade Biodiesel and Winter Grade Biodiesel
Amir Reza Sadrolhosseini,Mohd Maarof Moksin,Harrison Lau Lik Nang,Monir Norozi,W. Mahmood Mat Yunus,Azmi Zakaria
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12042100
Abstract: In this study, optical and thermal properties of normal grade and winter grade palm oil biodiesel were investigated. Surface Plasmon Resonance and Photopyroelectric technique were used to evaluate the samples. The dispersion curve and thermal diffusivity were obtained. Consequently, the variation of refractive index, as a function of wavelength in normal grade biodiesel is faster than winter grade palm oil biodiesel, and the thermal diffusivity of winter grade biodiesel is higher than the thermal diffusivity of normal grade biodiesel. This is attributed to the higher palmitic acid C 16:0 content in normal grade than in winter grade palm oil biodiesel.
Surface plasmon resonance determination of methanol concentration during alkaline transestrification
Amir Reza Sadrolhosseini,Mohd. Maarof Moksin,W. Mahmood,Mat. Yunus
Journal of Engineering and Applied Sciences , 2010,
Abstract: A surface plasmon resonance (SPR) method was applied to determine the methanol concentration during an alkaline transestrification of the mixture of palm oil and methanol. Theoretically, an SPR signal resonance angle relates with the refractive index of the mixture. Experimental data showed a resonance angle by way of refractive index depends on each volume percentage of palm oil, methanol, and methyl ester. The optimized percentages of volume concentration are found to be 12% methanol and 88% palm oil. At the present measurement precision, it resulted in 2% excess unutilized palm oil or methanol in the biodiesel mixture.
Application of Polypyrrole Multi-Walled Carbon Nanotube Composite Layer for Detection of Mercury, Lead and Iron Ions Using Surface Plasmon Resonance Technique
Amir Reza Sadrolhosseini, A. S. M. Noor, Afarin Bahrami, H. N. Lim, Zainal Abidin Talib, Mohd. Adzir Mahdi
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0093962
Abstract: Polypyrrole multi-walled carbon nanotube composite layers were used to modify the gold layer to measure heavy metal ions using the surface plasmon resonance technique. The new sensor was fabricated to detect trace amounts of mercury (Hg), lead (Pb), and iron (Fe) ions. In the present research, the sensitivity of a polypyrrole multi-walled carbon nanotube composite layer and a polypyrrole layer were compared. The application of polypyrrole multi-walled carbon nanotubes enhanced the sensitivity and accuracy of the sensor for detecting ions in an aqueous solution due to the binding of mercury, lead, and iron ions to the sensing layer. The Hg ion bonded to the sensing layer more strongly than did the Pb and Fe ions. The limitation of the sensor was calculated to be about 0.1 ppm, which produced an angle shift in the region of 0.3° to 0.6°.
Preparation of Graphene Oxide Stabilized Nickel Nanoparticles with Thermal Effusivity Properties by Laser Ablation Method
Amir Reza Sadrolhosseini,A. S. M. Noor,Kamyar Shameli,Alireza Kharazmi,N. M. Huang,M. A. Mahdi
Journal of Nanomaterials , 2013, DOI: 10.1155/2013/986764
Abstract: Nickel nanoparticles were dispersed uniformly in a graphene oxide solution, using a laser ablation technique with different ablation times that ranged from 5 to 20 minutes. The results indicate that the nickel nanoparticle sizes inside the graphene oxide decreased, and the volume fraction for the nickel nanoparticles in the graphene oxide increased with an increasing ablation time. Further, using Fourier Transform Infrared Spectroscopy, the nickel nanoparticles in the graphene oxide demonstrate greater stability from possible agglomeration when the nanoparticle was capped with oxygen from the carboxyl group of the graphene oxide. The thermal effusivity of the graphene oxide and nickel nanoparticle graphene oxide composite was measured using a photoacoustic technique. The concentration of graphene oxide shifted from 0.05?mg/L to 2?mg/L, and the thermal effusivity increased from 0.153?W·s1/2·cm?2·K?1 to 0.326?W·s1/2·cm?2·K?1. In addition, the thermal effusivity of the nickel nanoparticles graphene oxide composite increased with an increase in the volume fraction of nickel nanoparticles from 0.1612?W·s1/2·cm?2·K?1 to 0.228?W·s1/2·cm?2·K?1. 1. Introduction Nickel nanoparticles (Ni-NPs) have many important applications as catalysts, conducting and magnetic materials [1], and an electrode layer in multilayer ceramic capacitors [2, 3] and have both unique properties and potential applications in a variety of fields, including electronics [4], magnetic [5], energy technology [6], and biomedicine [7]. Ni-NPs can be synthesized using many methods, including photolytic reduction [8], radiolytic reduction [9], sonochemical [10], solvent extraction reduction [11], microemulsion technique [12], polyol method [13], and microwave irradiation [14]. Graphene Oxide (GO) is obtained from the oxidation of graphite crystals, a single-atomic-layered material. It can dissolve and disperse in a variety of solutions including water. GO has more applications for use in composites materials [15], solar cells [16], medicine [17, 18], antibacterial materials [19], and inorganic optoelectronic devices [20]. The GO molecular structure includes hydroxyl (OH–) and epoxy (–COO?) groups at the basal plane. Further, it also contains carboxyl groups (–COO?) at the edge of the molecular structure [21, 22]. Metal nanoparticles can improve and modify the physical properties of GO [20] as can be seen in [20] where the alteration of light scattering was achieved allowing an improved absorption of light in the solar cell. Further, Benayad et al. improved the resistivity of GO by the use of metal
A Study of Water Supercooling  [PDF]
Amir Gholaminejad, Reza Hosseini
Journal of Electronics Cooling and Thermal Control (JECTC) , 2013, DOI: 10.4236/jectc.2013.31001
Abstract:

The objective of this paper is to investigate water supercooling. Supercooling occurs when a liquid does not freeze although its temperature is below its freezing point. In general, supercooling is an unstable condition and occurs under special conditions. The parameters that influence supercooling stability and probability of occurrence include freezer temperature and water’s initial temperature. In this paper, it is shown that with a freezer temperature range of -3 to -8, supercooling is most likely to happen and is independent of the water’s initial temperature. Furthermore, as the freezer temperature decreases, the probability of nucleation increases, causing instant freezing. Finally, it is concluded that the Mpemba effect, in which initially hot water freezes faster than initially cold water, is due to the supercooling instability in initially hot water in which nucleation agents are more active.

Antimicrobial Assay of Chlorhexidine-Wetted Textile Napkins for Surgical Site Disinfection in Ocular Surgery  [PDF]
Amir Reza Daneshmand Eslami
International Journal of Clinical Medicine (IJCM) , 2013, DOI: 10.4236/ijcm.2013.412099
Abstract:

Background: As a new intraoperative disinfection method, chlorhexidine-wetted textile napkins have been employed in order to cover the upper and lower eyelid edges, eyelid skin, eyelashes, lid margins and palpebral conjunctiva during phacoemulsification cataract extraction. This study was conducted to compare the antimicrobial activity of textile napkins before and after their use. Methods: This study evaluated 80 textile napkins wetted with 0.02% aqueous solution of chlorhexidine. All textile napkins were divided into groups. The study group consisted of 60 used textile napkins which were collected from 29 patients (30 eyes) at the end of phacoemulsification, and the control group included 20 unused sterile textile napkins. Antimicrobial assay was performed by means of measuring the growth inhibition zones of the standard or clinical isolate strains under the textile napkins on the surface of agar media. Results: The number of textile napkins and the diameter of the growth inhibition zones (mm) in the study group and in the control group relating to gram-positive, gram-negative, and fungi were: 24/31 vs. 8/31, 32/30 vs. 8/30, and 4/30 vs. 4/30. The diameter of the growth inhibition zones of gram-positive bacteria was more than other investigated microorganisms. In the growth inhibition zones, exogenous microorganism colonies were not found. Conclusion: Antimicrobial activity of textile napkins wetted with 0.02% aqueous solution of chlorhexidine against gram-positive bacteria is more than gram-negative bacteria and fungi, and is preserved to the end of the

Farsi/Arabic Document Image Retrieval through Sub -Letter Shape Coding for mixed Farsi/Arabic and English text
Zahra Bahmani,Reza Azmi
International Journal of Computer Science Issues , 2011,
Abstract: A retrieval method for explicit recognition free Farsi/Arabic document is proposed in this paper. The system can be used in mixed Farsi/Arabic and English text. The method consists of Preprocessing, word and sub_word extraction, detection and cancelation of sub_letter connectors, annotation sub_letters by shape coding, classifier of sub_letters by use of decision tree and using of RBF neural network for sub_letter recognition. The Proposed system retrieves document images by a new sub_letter shape coding scheme in Farsi/Arabic documents. In this method document content captures through sub_letter coding of words. The decision tree-based classifier partitions the sub_letters space into a number of sub regions by splitting the sub_letter space, using one topological shape features at a time. Topological shape Features include height, width, holes, openings, valleys, jags, sub_letter ascenders/descanters. Experimental results show advantages of this method in Farsi/Arabic Document Image Retrieval.
Page 1 /179695
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.