Synthesis, Characterization, and Antibacterial Activity of ZnO Nanoparticles from Organic Extract of Cola Nitida and Cola Acuminata Leaf
A. E.
Aquisman
Resource Chemistry Program, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak 94300, Kota Samarahan, Sarawak, Malaysia.
author
B. S.
Wee
1Resource Chemistry Program, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak 94300, Kota Samarahan, Sarawak, Malaysia.
author
S. F.
Chin
1Resource Chemistry Program, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak 94300, Kota Samarahan, Sarawak, Malaysia.
author
D. E.
Kwabena
Resource Chemistry Program, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak 94300, Kota Samarahan, Sarawak, Malaysia.
author
K. O.
Michael
Department of Pharmaceutics, Centre for Plant Medicine Research, Mampong-Akuapem, Ghana.
author
T.
Bakeh
Resource Chemistry Program, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak 94300, Kota Samarahan, Sarawak, Malaysia.
author
Sh.
Semawi
Resource Chemistry Program, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak 94300, Kota Samarahan, Sarawak, Malaysia.
author
D. S.
Sylvester
St. Joseph’s College of Education, Bechem, Brong Ahafo Region, Ghana.
author
text
article
2020
eng
The study aimed at the synthesis and antibacterial activity of ZnO nanoparticles (NPs) from organic extracts of Cola nitida and Cola acuminata leaf using zinc chloride (ZnCl2) and zinc acetate dihydrate [Zn(CH3COO)2∙2H2O] as precursors on selected Gram positive and Gram negative microbes: Staphylococcus aureus, Exiguobacterium aquaticum, (Gram +ve) and Escherichia coli, Klebsielia pneumonia, Acinetobacter baumanni (Gram –ve). Spherical and flake-like nanostructures were recorded by Scanning Electron Microscopy (SEM) for C. acuminata and C. nitida respectively for the two precursors used. The average particle size and crystallite size determined by Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD) for C. acuminata and C. nitida were in the range of 32.15-43.26 nm; 69.12-84.26 nm and 14.69-17.12 nm; 23.68-23.96 nm respectively. Energy-dispersive X-ray spectroscopy (EDX), UV- visible spectroscopy (UV-vis), Atomic Absorption Spectroscopy (AAS) and Fourier-transform infrared spectroscopy (FT-IR) techniques were used to observe the purity and surface functional groups of the samples. Spectra peaks at 440-458 cm-1 and 364-370 nm confirmed the presence of ZnO in the samples by FT-IR and UV-vis, whereas AAS at 213.9 nm wavelength further confirmed elemental zinc with a percentage atomic weight of 71.37% as against 69.50%, 18.8% and 11.1% for Zinc, Oxygen and Carbon by EDX. Data from the antibacterial activity studies show an increase in inhibition rate as concentration of the ZnO NPs increases in concentration from 25-1000 ppm. ZnO NPs from the two extracts recorded the highest inhibition rate in Acinetobacter baumanni of approximately 88% and 49% using ZnCl2 and Zn(CH3COO)2∙2H2O respectively.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
16
v.
2
no.
2020
73
89
https://www.ijnnonline.net/article_39978_bf11680bdacc77e771154b715d5eb5b9.pdf
Comparison of Binary and Ternary Compositions of Ni-Co-Cu Oxides/VACNTs Electrodes for Energy Storage Devices with Excellent Capacitive Behaviour
S. A.
Hosseini
Department of Electrical Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran.
author
M.
Saghafi
Department of Materials Science and Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran.
author
H.
Abiri
Department of Electrical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran.
author
text
article
2020
eng
Electrochemical performance of binary and ternary oxides composed of Ni, Co and Cu produced over a 3-dimensional substrate of vertically aligned carbon nano-tubes (VACNT) as electrodes for aqueous energy sources, is reported and compared in this paper. VACNTs were fabricated inside a DC-plasma enhanced chemical vapor deposition chamber and composite materials fabricated by thermal decomposition method on the surface of VACNT electrodes. XRD, Raman and electron microscopy tests were used to verify electrodes proper composition and interface between the electrodes substrate and active material. Cyclo-voltammetry experiments were done over electrodes and Co-Cu oxide/VACNT electrode found to have the highest charge capacity of 230 mC cm-2 among the electrodes. Electrical impedance spectroscopy was done to determine electrodes electrical behavior in different frequencies and find their characteristics quality as well.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
16
v.
2
no.
2020
91
102
https://www.ijnnonline.net/article_39979_40781d098494a550fa8de560869e61ec.pdf
Numerical Simulation of MHD Boundary Layer Stagnation Flow of Nanofluid over a Stretching Sheet with Slip and Convective Boundary Conditions
D.
Ramya
Department of Mathematics, University College of Science, Osmania University, Hyderabad, 500007, Telangana, India.
author
J. A.
Rao
Department of Mathematics, University College of Science, Osmania University, Hyderabad, 500007, Telangana, India.
author
I.
Shravani
Department of Mathematics, Government Degree College, Adilabad, 504001, Telangana, India.
author
text
article
2020
eng
An investigation is carried out on MHD stagnation point flow of water-based nanofluids in which the heat and mass transfer includes the effects of slip and convective boundary conditions. Employing the similarity variables, the governing partial differential equations including continuity, momentum, energy, and concentration have been reduced to ordinary ones and solved by using Keller-Box method. The behavior of emerging parameters is presented graphically and discussed for velocity, temperature, and nanoparticles fraction. The numerical results indicate that for the stretching sheet, the velocity at a point decreases with the increase in the values of and M; whereas both temperature and nanoparticle concentration increase with the increase in velocity slip parameter ( , magnetic parameter (M) and convective parameter ( . And also, observed that the velocity profile increases with the increase in velocity ratio parameter.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
16
v.
2
no.
2020
103
115
https://www.ijnnonline.net/article_39980_23046f0cea217455350275f4aa768f4d.pdf
Amido-Amino Clay Stabilized Copper Nanoparticles: Antimicrobial Activity and Catalytic Efficacy for Aromatic Amination
A.
Shibana T
Department of Chemistry, Pondicherry University, Pondicherry, PY 605014 India.
author
J.
Raiza
Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai,
TN 600025 India.
author
K.
Pandian
Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai,
TN 600025 India.
author
text
article
2020
eng
Amido-amino functionalized halloysite stabilized copper nanoparticles (aah-CuNPs) were synthesized through one-pot protocol by a wet chemical method using hydrazine as reducing agent. The nanocomposite formed was stable in dry ethanol. The composition and binding nature of the nanocomposite were studied using FT-IR, DRS-UV, EDAX and powder XRD techniques. The morphological features of the composite were obtained from HRSEM analysis. The thermal stability of the copper nanocomposites was studied using TGA analysis. The prepared nanocomposite displayed broad spectrum antimicrobial activity, and it was very effective in Ullmann aromatic amination reaction.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
16
v.
2
no.
2020
117
125
https://www.ijnnonline.net/article_39981_4abf671785a5ce9b399ede2710c9fb1c.pdf
The Effect of Temperature and Acidity on Antimicrobial Activities of Pristine MWCNTs and MWCNTs-Arg
H.
Zare-Zardini
Hematology and Oncology Research Center, Shahid Sadoughi Hospital, Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran.
author
M.
Shanbedi
Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran.
author
H.
Soltaninejad
Department of Nano Biotechnology, Faculty of Biological Sciences, Tarbiat Modares University, Tehran 14115, Iran.
author
M.
Mohammadzadeh
Department of Reproductive Biology, Yazd Reproductive Sciences Institute, Research and Clinical Center for Infertility, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
author
A.
Amiri
Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, United States.
author
A. A.
Hamidieh
Pediatric Cell Therapy Research Center, Tehran University of Medical Sciences, Tehran, Iran.
author
F.
Ferdowsian
Department of Pediatrics, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
author
A.
Alemi
Abadan Faculty of Medical Sciences, Abadan, Iran
author
S.
Hoseinkhani
Department of Nano Biotechnology, Faculty of Biological Sciences, Tarbiat Modares University, Tehran 14115, Iran.
author
F.
Fesahat
Reproductive Immunology Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
author
A.
Astani
Department of Microbiology, Faculty of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
author
text
article
2020
eng
Carbon nanotubes (CNTs) have very promising applications for inhibition of microbial growth. The aim of this study is investigation and comparison of the effect of temperature and acidity on antimicrobial activities of pristine Multiwalled Carbon nanotubes (MWCNTs) and Multiwalled Carbon nanotubes-Arginine (MWCNTs-Arg). Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) were calculated in range of temperature (25, 37 and 42 ºC) and pH (4.2, 7.2, and 10) on Staphylococcus aureus. The results approved that pristine and functionalized MWCNTs have broad-spectrum antimicrobial activities against examined pathogen. Between these agents, MWCNTs-Arg and pristine MWCNTs and have the highest inhibitory activity on microbial growth, respectively. The MBC value of MWCNTs was improved by amino acid functionalization. The optimal pH for antimicrobial activity of pristine MWCNTs and MWCNTs-Arg are 4.2 and 7.2 and optimal temperatures are 42 ºC and 42 ºC, respectively. There is no change on optimal temperature of MWCNTs by this functionalization, but functionalization of MWCNTs by Arg enhanced its antimicrobial activity and led to change of optimal pH of MWCNTs for antimicrobial activity. This changes lead to suitable improvement of antimicrobial activity in neutral and biological pH.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
16
v.
2
no.
2020
127
136
https://www.ijnnonline.net/article_39982_f46a8330d3683a583a954e0e974eec57.pdf
The Effect of Different Supports on the Characteristic and Catalytic Properties of Ni-Mo/Cs1.5H1.5PW12O40/S (S= SiO2 or Al2O3 or ASA) Nanocatalysts in Hydrocracking of n-decane
H.
Amirmoghadam
Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran.
author
H. R.
Aghabozorg
Research Institute of Petroleum Industry, Tehran, Iran.
author
M.
Hossaini Sadr
Department of Chemistry, Azarbaijan Shahid Madani University, Tabriz, Iran.
author
F.
Salehirad
Research Institute of Petroleum Industry, Tehran, Iran.
author
A.
Irandoukht
Research Institute of Petroleum Industry, Tehran, Iran.
author
text
article
2020
eng
In this research, Ni-Mo/Cs1.5H1.5PW12O40/S (S=SiO2 or Al2O3 or ASA (amorphous silica alumina)) nanocatalysts with different supports were prepared via 2 steps with impregnation method and the effect of support on the characteristic and catalytic properties of the prepared samples was studied. The synthesized samples were characterized by X-ray diffraction (XRD), temperature programmed desorption (TPD), temperature programmed reduction (TPR), and energy dispersive X-ray spectroscopy (EDX). Morphology of the samples was studied by field emission scanning electron microscope (FE-SEM) and the surface area, pore volume and pore size of the catalysts were determined by BET (Brunauer-Emmett-Teller) method. In the XRD patterns of the prepared catalysts, the H3PW12O40 (HPW) phase was observed. The FE-SEM images showed that the synthesized particles were in nanoscale. The results of TPD studies indicated that moderate acidic sites of Al2O3 supported nanocatalyst was more than the others. The catalytic activity of the nanocatalysts in hydrocracking of n-decane indicated that Al2O3 supported nanocatalyst had the highest catalytic activity.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
16
v.
2
no.
2020
137
144
https://www.ijnnonline.net/article_39983_0b086238268ac313a5a9358917b172fb.pdf