scholarly journals Structural Characterisation of ZnO Particles Obtained by the Emulsion Precipitation Method

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Agnieszka Kołodziejczak-Radzimska ◽  
Ewa Markiewicz ◽  
Teofil Jesionowski
Keyword(s):  
Zinc Oxide ◽  
Electron Microscope ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Scattering Method ◽  
Adsorption Parameters ◽  
Structural Characterisation ◽  
Developed Surface ◽  
Zno Particles ◽  
Nonionic Surfactant Mixture

Zinc oxide was obtained by precipitation in an emulsion system with zinc acetate used as a precursor of ZnO and potassium hydroxide or sodium hydroxide as a precipitating agent. The cyclohexane, as an organic phase, and a nonionic surfactant mixture were also used for preparation of the emulsion. By applying modifications of the ZnO precipitation process, such as changing the precipitating agent, composition of substrates, and the rate of substrate dosing, some interesting structures of ZnO particles were obtained. The morphology of the modified samples was analysed based on SEM (scanning electron microscope) and TEM (transmission electron microscope) images. Moreover the samples were characterised by determination of their dispersive properties using the noninvasive back scattering method (NIBS), adsorption parameters (BET), and crystalline structure (XRD). Thermogravimetric analysis (TG) as well as infrared spectrophotometry (FT-IR) was also applied. For selected samples their electrical properties (dielectric permittivity and electric conductivity) were also measured. The zinc oxide obtained consisted of particles in the shapes of solids, ellipsoids, rods, and flakes, with size ranging from 164 to 2670 nm and showed well-developed surface area with values as high as 20 m2/g.

The Preparation and Characterization of Fe-ZnO Nanoparticles Immobilized onto Fiberglass Cloth

2020 ◽  
Vol 402 ◽  
pp. 115-124
Author(s):  
Muktarida Omar ◽  
Muhammad Adlim ◽  
Ilham Maulana ◽  
Suhendrayatna Suhendrayatna ◽  
Ismail Ismail
Keyword(s):  
Photocatalytic Decomposition ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Tem Analysis ◽  
Characterization Methods ◽  
Zno Particles ◽  
Doped Zno ◽  
Co Precipitation ◽  
Fiberglass Cloth

Lousy odor is severe pollution in natural rubber processing industries and the air pollution treatment by using photocatalytic decomposition method has not much known. This study aims to explore the photocatalyst preparation and characterization of Fe doped ZnO immobilized on fiberglass cloth. Fe doped ZnO was prepared both with and without co-precipitation agent of NaOH. Both methods confirmed the metal existence and gave crystallite catalyst particles with mean diameters of 50 nm according to XRD characterization methods. SEM-EDS analysis showed Fe-ZnO particles prepared without co-precipitation were less aggregated particles than those made with the other method. EDS data identified the elemental composition of Zn, Fe, and O, and the fiberglass cloth composition, including Si and Mg. In the co-preparation method, sodium was always existed along with Fe and ZnO. DR-UV analysis showed the bandgap of Fe-ZnO was 3.20 and 3.22 eV without and with co-precipitation methods, respectively. TEM analysis of the catalyst slurry shows all particles were agglomerated in both preparations. Spherical-like particles existed non-precipitation method, and a spherical- and rod particle shapes were detected in co-precipitation preparation. The non-co-precipitation process was a preparable step in immobilization of the Fe-ZnO particles onto fiberglass cloth

Complexional Ultrafine Zinc Oxide Powders Prepared by Controlled-Release Precipitation

2011 ◽  
Vol 306-307 ◽  
pp. 1369-1374
Author(s):  
Zhi Fang Tong ◽  
Yinq Jie Li ◽  
Li Xiu Lian
Keyword(s):  
Zinc Oxide ◽  
Controlled Release ◽  
Average Particle Size ◽  
Ammonia Solution ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Oxide Powders ◽  
Wide Range

The synthesis of complexional ultrafine zinc oxide powders by controlled-release precipitation method, which is a precipitation process of precursor by controlling ammonia distillation rate in ammonia solution under the combination effect of microwave heating and ultrasonic cavitating, and followed by subsequent heat treatment was investigated. The characteristic of precursor and zinc oxide powders were studied using X-ray diffraction, scanning electron microscopy, TG-DTA-DTG, FT-IR, and ultraviolet-visible pectrophotometer. The coloring mechanism of complexional zinc oxide is discussed. This has shown that a tentative composition of the precursor is likely Zn3CO3(OH)4·H2O. Complexional zinc oxide particles of an average particle size of 200 nm with narrow size distribution, good dispersibility and hexagonal appearance could be obtained after annealing at 350°C for 1.5 hour. ZnO particles are complexional, probably due to nitrogen atom or N-H bond entering into crystal lattice of zinc oxide. Complexional zinc oxide has fine capacity of shielding UV and absorbing wide range of wavelength.

Antimicrobial activity of nanocomposites: poly(amide) 6 and low density poly(ethylene) filled with zinc oxide

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Guillaume Droval ◽  
Ibon Aranberri ◽  
Ainhoa Bilbao ◽  
Lorena German ◽  
Marc Verelst ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Electron Microscope ◽  
Dynamic Method ◽  
Low Density ◽  
E Coli ◽  
Zno Particles ◽  
Poly Ethylene ◽  
Scanning Electron

AbstractThe antimicrobial activity against E. coli, St. aureus and A. niger of zinc oxide when blended with polymers has been measured by an applied dynamic method. Two polymers: poly(amide) 6 (PA6) and low density poly(ethylene) (LDPE) have been used as matrix. ZnO nanoparticles content as low as 1% w/w in the polymers showed great antibacterial activity but no antifungal activity. The results of bacterial slaying capability of these nanocomposites was also found to be better when zinc oxide was dispersed in PA6, where the efficiency is similar to pure ZnO particles. The composites have been investigated by means of scanning electron microscope (SEM) and differential scanning calorimeter (DSC).

Extraction and identification of fillers and pigments from pyrolyzed rubber and tire samples

1996 ◽  
Vol 54 ◽  
pp. 174-175
Author(s):  
P. Sadhukhan ◽  
J. B. Zimmerman
Keyword(s):  
Zinc Oxide ◽  
Electron Microscope ◽  
Carbon Black ◽  
Natural Rubber ◽  
Transmission Electron Microscope ◽  
Rolling Resistance ◽  
Synthetic Polymers ◽  
Nitrogen Atmosphere ◽  
Transmission Electron ◽  
Curing Agents

Rubber stocks, specially tires, are composed of natural rubber and synthetic polymers and also of several compounding ingredients, such as carbon black, silica, zinc oxide etc. These are generally mixed and vulcanized with additional curing agents, mainly organic in nature, to achieve certain “designing properties” including wear, traction, rolling resistance and handling of tires. Considerable importance is, therefore, attached both by the manufacturers and their competitors to be able to extract, identify and characterize various types of fillers and pigments. Several analytical procedures have been in use to extract, preferentially, these fillers and pigments and subsequently identify and characterize them under a transmission electron microscope.Rubber stocks and tire sections are subjected to heat under nitrogen atmosphere to 550°C for one hour and then cooled under nitrogen to remove polymers, leaving behind carbon black, silica and zinc oxide and 650°C to eliminate carbon blacks, leaving only silica and zinc oxide.

Applications of ZnO and MgO Nanoparticles in Reducing Zinc Pollution Level in Rubber Manufacturing Processes: A Review

2020 ◽  
Vol 6 (2) ◽  
pp. 103-107 ◽  
Author(s):  
Seyyed Mohammad Javadi
Keyword(s):  
Zinc Oxide ◽  
Fatty Acid ◽  
Magnesium Oxide ◽  
Environmental Effects ◽  
Pollution Level ◽  
Oxide Nanoparticles ◽  
Mgo Nanoparticles ◽  
Magnesium Oxide Nanoparticles ◽  
Council Directive ◽  
Zno Particles

Background: Rubber vulcanization is a consolidated chemical process to enhance the mechanical properties of the polymeric material by sulfur crosslinking of the polymer chains, such as rubber. Vulcanization Activators are important rubber processing additives that activate sulfur cure and improve the efficiency of sulfur-based cure systems. The most common activator is zinc fatty acid ester that is often formed in-situ by the reaction of fatty acid with zinc oxide. Although zinc is one of the less harmful heavy metals, according to European Council Directive 2004/73/EC, the reduction of zinc level in the environment has become an important task because of its toxic effect on aquatic organisms. : The current study reviews the research achievements in the field of reducing the consumption of micronutrients of ZnO particles based on the use of nanoparticles instead of them in the polymer industry. Among the proposed methods, due to the less environmental effects of magnesium oxide, the use of MgO nanoparticles instead of zinc oxide has also achieved good results. Objective: The aim of this paper is considering suggested different methods on the reduction of using ZnO particles in related industries, the use of ZnO nanoparticles has had better results than its particles. In addition, due to the less environmental effects of magnesium oxide, magnesium oxide nanoparticles can be used instead of micronutrients of zinc oxide. Overall, the results of various investigations show that reducing the diameter of the zinc oxide particles reduces the amount required for curing the rubber and thus reduces its toxic effects. Also, the use of magnesium oxide nanoparticles instead of zinc oxide in different concentrations is investigated.

Thermodynamic and anticancer properties of inorganic zinc oxide nanoparticles synthesized through co-precipitation method

2021 ◽  
Vol 330 ◽  
pp. 115602
Author(s):  
Seyyed Vahid Mousazad Goorabjavari ◽  
Fateme Golmohamadi ◽  
Saba Haririmonfared ◽  
Hosein Ahmadi ◽  
Soheil Golisani ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Anticancer Properties ◽  
Co Precipitation

A novel separation method of the valuable components for activated clay production wastewater

2021 ◽  
Vol 19 (1) ◽  
pp. 530-540
Author(s):  
Lvshan Zhou ◽  
Tongjiang Peng ◽  
Hongjuan Sun ◽  
Dong Fu ◽  
Chuan Lai
Keyword(s):  
Aluminum Phosphate ◽  
Iron Phosphate ◽  
Acid Sites ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Precipitation Process ◽  
Iron Aluminum ◽  
Phosphorus Iron ◽  
Optimized Conditions ◽  
Acidic Wastewater

Abstract The acidic wastewater produced by the wet production of activated clay contains valuable components such as iron and aluminum. The precipitation method was successfully introduced to separate iron and aluminum from the activated clay production wastewater step by step, which can not only recover the valuable components, but also avoid environmental pollution. In the separation process, gypsum, iron aluminum phosphate, alumina, and sodium sulfate were prepared, and the phase compositions of separation products were analyzed by XRD and IR. The main influencing factors in the separation of iron and aluminum components were studied by single factor experiment. The results show that at the optimized conditions, phosphorus/iron molar ratio 6.0, the system pH 3.0, the reaction temperature 343 K, and the reaction time 90 min, the iron(iii) ion in the system can form a sodium-containing aluminum iron phosphate double salt, and the filtrate after separating Fe3+ and part of Al3+ can meet the requirements for forming high-purity Al2O3. During the phosphate precipitation process, the hypothesis should be correct that Al3+ reacts with PO 4 3 − {\text{PO}}_{4}^{3-} to form an AlPO4 skeleton, Fe3+ isomorphically replaces Al3+ in the [AlO4] tetrahedron, and adsorption occurs simultaneously, with Na+ occupying the terminal acid sites, P(Al)–OH.

scholarly journals Cellulose Nanofiber-Based Nanocomposite Films Reinforced with Zinc Oxide Nanorods and Grapefruit Seed Extract

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 877 ◽  
Author(s):  
Swarup Roy ◽  
Hyun Chan Kim ◽  
Pooja S. Panicker ◽  
Jong-Whan Rhim ◽  
Jaehwan Kim
Keyword(s):  
Thermal Stability ◽  
Zinc Oxide ◽  
Seed Extract ◽  
Cellulose Nanofiber ◽  
Nanocomposite Films ◽  
Zinc Oxide Nanorods ◽  
Precipitation Method ◽  
Active Food Packaging ◽  
Oxide Nanorods ◽  
Grapefruit Seed Extract

Here, we report the fabrication and characterization of cellulose nanofiber (CNF)-based nanocomposite films reinforced with zinc oxide nanorods (ZnOs) and grapefruit seed extract (GSE). The CNF is isolated via a combination of chemical and physical methods, and the ZnO is prepared using a simple precipitation method. The ZnO and GSE are used as functional nanofillers to produce a CNF/ZnO/GSE film. Physical (morphology, chemical interactions, optical, mechanical, thermal stability, etc.) and functional (antimicrobial and antioxidant activities) film properties are tested. The incorporation of ZnO and GSE does not impact the crystalline structure, mechanical properties, or thermal stability of the CNF film. Nanocomposite films are highly transparent with improved ultraviolet blocking and vapor barrier properties. Moreover, the films exhibit effective antimicrobial and antioxidant actions. CNF/ZnO/GSE nanocomposite films with better quality and superior functional properties have many possibilities for active food packaging use.

Template Induced Synthesis of Nano-Hydroxyapatite by Co-Precipitation Method

2011 ◽  
Vol 311-313 ◽  
pp. 1713-1716 ◽  
Author(s):  
Yan Rong Sun ◽  
Tao Fan ◽  
Chang An Wang ◽  
Li Guo Ma ◽  
Feng Liu
Keyword(s):  
Electron Microscope ◽  
Chondroitin Sulfate ◽  
Aspartic Acid ◽  
Transmission Electron Microscope ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Morphology ◽  
Transmission Electron ◽  
Co Precipitation

Nano-hydroxyapatite with different morphology was synthesized by the co-precipitation method coupled with biomineralization using Ca(NO3)2•4H2O and (NH4)2HPO4 as reagents, adding chondroitin sulfate, agarose and aspartic acid as template. The structure and morphology of the prepared powders were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM).

Novel Fe3O4/HNT@rGO composite via a facile co-precipitation method for the removal of contaminants from aqueous system

RSC Advances ◽  
2016 ◽  
Vol 6 (54) ◽  
pp. 49228-49235 ◽  
Author(s):  
Chengwei Gao ◽  
Baojun Li ◽  
Ning Chen ◽  
Jie Ding ◽  
Qiang Cai ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Water Treatment ◽  
Potential Application ◽  
High Performance ◽  
Aqueous System ◽  
Precipitation Method ◽  
Precipitation Process ◽  
System P ◽  
Removal Of Contaminants ◽  
Co Precipitation

Fe3O4/HNT@rGO composite (FHGC) was fabricated via a facile co-precipitation process, followed by heat treatment. For RhB and As5+removal, the high performance and easy separation of FHGC highlight its potential application in water treatment.

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