Miniemulsion Polymerization to Prepare Beta Cypermethrin Nanocapsule

2011 ◽  
Vol 236-238 ◽  
pp. 2024-2027 ◽  
Author(s):  
He Tang Zheng ◽  
Yue Zhang ◽  
Dao Wei Huang
Keyword(s):  
Miniemulsion Polymerization ◽  
Loading Capacity ◽  
Uniform Size ◽  
Transmission Electron ◽  
Particle Size Analyzer ◽  
Mean Size ◽  
The Mean ◽  
Fatty Alcohol Polyoxyethylene Ether ◽  
Polymerization Method ◽  
Tga Analysis

We reported here a novel procedure for preparing 2.5% beta cypermethrin/polyacrylate nanocapsules using miniemulsion polymerization method, in which formulation the stearic acid (SD) as assistant stabilizer and fatty alcohol-polyoxyethylene ether (n=9) sodium sulfate (AES) as emulsifier. The nanocapsules were characterized by IR, UV, transmission electron microscopy (TEM), laser particle size analyzer and TGA. It proves that beta cypermethrin nanocapsules have uniform size and core-shell structure, and the mean size is 49.1 nm. The encapsulation efficiency of nanocapsules is 84.6% and the loading capacity of nanocapsules is 13.4%. The analysis of FTIR and UV show there are no toxic organic solvent and benzene adjuvant existing in the formulation, therefore, the nanocapsule is eco-friendly. TGA analysis indicates the nanocapsule possesses release-controlled performance and could extend the duration.

Application of the polycaprolactone polymer for the encapsulation of geraniol: evaluation of the efficiency and stability

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Thaís Karoline Carniel ◽  
Pâmela Fagundes ◽  
Ana Carolina Vivan ◽  
Luciano Luiz Silva ◽  
Micheli Zanetti ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Essential Oil ◽  
Natural Compound ◽  
Thermal Protection ◽  
Miniemulsion Polymerization ◽  
Food Preservation ◽  
Transmission Electron ◽  
Mean Size ◽  
Antibacterial And Antifungal

Abstract Geraniol has been an attractive compound for food preservation due to its antibacterial and antifungal actions. The main objective of this study was to produce and characterize polycaprolactone (PCL) capsules for the protection of the encapsulated geraniol essential oil. The encapsulation was carried out using a miniemulsion polymerization technique with an efficiency of (95.44 ± 0.60%). The capsules were obtained with a mean size of 148 nm and with a polydispersity index of 0.12. Transmission electron microscopy results confirmed the formation of spherical capsules of PCL coating the geraniol. From the analysis of thermogravimetry, it was possible to prove the thermal protection of geraniol by PCL coating since the release of the encapsulated geraniol occurred with temperatures 100 °C higher than the volatilization temperature of the natural compound. An important observation was that the microcapsules of PCL-geraniol immersed in aqueous suspensions at 4 °C showed good stability over 60 days.

scholarly journals MicroRNA Profiling of Exosomes Derived from Red Blood Cell Units: Implications in Transfusion-Related Immunomodulation

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Haobo Huang ◽  
Jinfeng Zhu ◽  
Liping Fan ◽  
Qiuyan Lin ◽  
Danhui Fu ◽  
...  
Keyword(s):  
Blood Cell ◽  
Red Blood Cell ◽  
Storage Time ◽  
Bioinformatic Analysis ◽  
Mirna Microarray ◽  
Qrt Pcr ◽  
Transmission Electron ◽  
Mean Size ◽  
The Mean ◽  
Polymerase Chain

Purpose. To elucidate the microRNAs existent in exosomes derived from stored red blood cell (RBC) unit and their potential function. Materials and Methods. Exosomes were isolated from the supernatant derived from stored RBC units by sequential centrifugation. Isolated exosomes were characterized by TEM (transmission electron microscopy), western blotting, and DLS (dynamic light scattering). MicroRNA (miRNA) microarray was performed to detect the expression of miRNAs in 3 exosome samples. Results revealed miRNAs that were simultaneously expressed in the 3 exosome samples and were previously reported to exist in mature RBCs. Functions and potential pathways of some detected miRNAs were illustrated by bioinformatic analysis. Validation of the top 3 abundant miRNAs was carried out by qRT-PCR (quantitative reverse transcription‐polymerase chain reaction). Results. TEM and DLS revealed the mean size of the exosomes (RBC-derived) as 64.08 nm. These exosomes exhibited higher abundance of short RNA than the long RNA. 78 miRNAs were simultaneously detected in 3 exosome samples and mature RBCs. Several biological processes might be impacted by these miRNAs, through their target gene(s) enriched in a particular signalling pathway. The top 3 (abundant) miRNAs detected were as follows: miR-125b-5p, miR-4454, and miR-451a. qRT-PCR revealed higher abundance of miR-451a than others. Only miR-4454 and miR-451a abundance tended to increase with increasing storage time. Conclusion. Exosomes derived from stored RBC units possessed multiple miRNAs and, hence, could serve various functions. The function of exosomes (RBC-derived) might be implemented partly by the predominantly enriched miR-451a.

Surface Modification and Preparation of High Purity Nanometer Magnesium Hydroxide Using Impinging Stream

2011 ◽  
Vol 675-677 ◽  
pp. 847-851
Author(s):  
Jian Hai Zhao ◽  
Yan Ping Lai
Keyword(s):  
Surface Modification ◽  
Magnesium Hydroxide ◽  
High Purity ◽  
X Ray Diffraction ◽  
Control Factors ◽  
Operation Conditions ◽  
Crystallization Method ◽  
Transmission Electron ◽  
Mean Size ◽  
The Mean

High purity nanometer magnesium hydroxide is produced by impinging stream reaction crystallization method using bischofite as feedstock. Effects of operation conditions on the impinging stream of Mg (OH)2 are reported and the control factors of purity are confirmed. The morphology of the powder was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Result shows that purity of Mg (OH)2 can reach 99% and the mean size of crystal is 13.5nm. Surface modification of nano-sized magnesium hydroxide using four surface modifiers such as sodium steatite, sodium laurylsulfonate, sodium oleate and sodium silicate were investigated in this paper. The modified magnesium hydroxide has smaller particle size, larger powder contact angle, slower sedimentation velocity, the less in-oil capacity than unmodified sample

scholarly journals Hybrid Latex Particles: Preparation with Miniemulsion Polymerization

2018 ◽  
Vol 149 ◽  
pp. 01035 ◽  
Author(s):  
F. Bouanani
Keyword(s):  
Miniemulsion Polymerization ◽  
Melt Processing ◽  
Montmorillonite Clay ◽  
Polymerization Process ◽  
Surfactant Mixture ◽  
Clay Particles ◽  
Transmission Electron ◽  
Nonionic Surfactant Mixture ◽  
Polymerization Method ◽  
Hybrid Latex

This research developed a novel poly(trifluoropropylmethylsiloxane) (PTMS)/montmorillonite nanoparticles, for technologic applications. PTMS /MMT nanoparticles were prepared by the miniemulsion polymerization method. Montmorillonite clay was encapsulated within a fluorinated cyclosiloxane (1,3,5-tris(trifluoropropylmethyl)cyclotrisiloxane) to give stable water based nanocomposite latex, using miniemulsion polymerization technique. The resulting composite latex was characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS) and RX diffraction. The particles stability was investigated by sedimentation and surface tension measurements. An efficient cationic/nonionic surfactant mixture was used in order to achieve the best compatibility with the monomer. TEM and RX data revealed the partial embedding of montmorillonite in the spherical polymer based nanoparticles. According to DLS measurements, the encapsulated clay particles conserve their size throughout the polymerization process. The melt processing of poly(trifluoropropylmethylsiloxane) matrix to encapsulate the montmorillonite clay was also carried out for comparison purposes.

The Influence of Polymer Architecture on Nanosized Hydroxyapatite Precipitation

2008 ◽  
Vol 8 (2) ◽  
pp. 667-674 ◽  
Author(s):  
Özlem Dogan ◽  
Mualla Öner
Keyword(s):  
Thermal Stability ◽  
Particle Size ◽  
Atmospheric Conditions ◽  
Wet Chemical Synthesis ◽  
Air Atmosphere ◽  
Particle Size Analyzer ◽  
Sem Micrograph ◽  
Mean Size ◽  
Wet Chemical ◽  
The Mean

In this work we present a facile way to produce hydroxyapatite (HAP) nanoparticles by wet chemical synthesis in the presence of polyelectrolytes under controlled temperature, pH, and atmospheric conditions. The resulting calcium rich carbonated HAP is sintered in an air atmosphere to investigate the thermal stability of the synthesized powders. The morphology and microstructure of the HAP nanoparticles were investigated by XRD, SEM, FTIR spectroscopy, thermal analysis, and particle size analyzer. Polyelectrolytes affect the coherent length of the crystalline domain, the dimension and particle size distribution of the crystals. The reduction in size is greater in the direction of the c-axis. The SEM micrograph shows the formation of well-crystallized, agglomerated small particles of HAP. The mean size of the subunit is smaller than that of the surface of the grain observed in SEM. X-ray analysis have shown that the resulting particles have high thermal stability.

Preparation of Paclitaxel-Loaded Microspheres with Fe3O4 Nanoparticles and Study of their Target-Orientation and Sustained-Release Property

2012 ◽  
Vol 535-537 ◽  
pp. 521-524
Author(s):  
Sheng Cui ◽  
Ben Lan Lin ◽  
Xiao Dong Shen
Keyword(s):  
Sustained Release ◽  
Loading Rate ◽  
Drug Loading ◽  
Target Orientation ◽  
Mtt Method ◽  
Transmission Electron ◽  
Release Property ◽  
Mean Size ◽  
Magnetic Fe3o4 Nanoparticles ◽  
The Mean

Paclitaxel-loaded microspheres with magnetic Fe3O4 nanoparticles were synthesized with albumin as carrier. The morphology was characterized by high-resolution transmission electron microscopy (HRTEM). The drug-loading rate and entrapment rate of the microspheres were researched by ultraviolet and visible spectrophotometer. The inhibition action of taxol microspheres to growth of esophagus cancer Eca109 cell were examined by MTT method. The result shows that it is regular spherical. The mean size and size distribution of microspheres are 275.6nm and 144.3nm by Zetasizer3000. The drug-loading rate is 3.013% and the entrapment rate is 35.26%. It has excellent target-orientation and sustained-release property which can prevent the growth of Eca109 cell.

Synthesis of α-Fe2O3 nanoparticles and analyzing the effect of annealing temperature on its properties

2020 ◽  
Vol 38 (1) ◽  
pp. 116-121
Author(s):  
Bhargavi Ram Thimmiah ◽  
Gobi Nallathambi
Keyword(s):  
Size Distribution ◽  
Potassium Hydroxide ◽  
Annealing Temperature ◽  
X Ray Diffraction ◽  
Uniform Size ◽  
X Ray ◽  
The Mean ◽  
Co Precipitation ◽  
Tga Analysis ◽  
Uniform Size Distribution

Abstractα-Fe2O3 nanoparticles were synthesized via co-precipitation technique using ferric and ferrous salts and potassium hydroxide as precipitation agents. The samples were calcined at 350 °C, 550 °C and 750 °C for 3 hours. The obtained iron oxide was characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and dynamic light scattering (DLS). Crystallinity of the sample was studied by X-ray diffraction. SEM micrographs showed nonuniform size distribution of the particles forming agglomerates. TGA analysis revealed trace amount of weight loss and material stability for the samples calcined at temperatures above 500 °C. DLS results indicated that increasing of annealing temperature resulted in reduction of the particle size and more uniform size distribution. At the maximum annealing temperature of 750 °C, the mean diameter of the particles of 100 nm was observed.

Preparation of Ultrafine Polyethylene-Silica Composite Particle with Core-Shell Structure

2012 ◽  
Vol 557-559 ◽  
pp. 554-557 ◽  
Author(s):  
Lei Zu ◽  
Shun Yu Han ◽  
Kai Gu ◽  
Xiu Guo Cui
Keyword(s):  
Shell Structure ◽  
Composite Particle ◽  
Sol Gel ◽  
Core Shell ◽  
Silica Composite ◽  
Transmission Electron ◽  
Mean Size ◽  
The Mean ◽  
Core Shell Structure ◽  
Electronic Microscope

A novel ultrafine polyethylene/silica composite particle with core-shell structure was prepared by the sol-gel method in the presence of the melt polyethylene emulsion. A series of samples with different polyethylene content were prepared to investigate the unique characteristics of this original composite particle. The core-shell structure and composition of the composite particle was proved by the transmission electron microscopy observation and Fourier transform infrared spectra. The composite particles possess a spherical morphology and the mean size is about 160nm, presented by the scanning electronic microscope observation and nanoparticle tracking analysis, respectively.

Synthesis and Characterization of Polystyrene-Graphite Nanocomposites via Surface Raft-Mediated Polymerization

2012 ◽  
Vol 463-464 ◽  
pp. 527-532
Author(s):  
Hussein M. Etmimi ◽  
Ronald D. Sanderson
Keyword(s):  
Mechanical Properties ◽  
Miniemulsion Polymerization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Reversible Addition ◽  
Raft Agent ◽  
Polymerization Method ◽  
Better Than

The synthesis of polystyrene/GO (PS-GO) nanocomposites using the reversible addition-fragmentation chain transfer (RAFT) mediated polymerization method is described. The GO was synthesized and immobilized with a RAFT agent to afford RAFT-functionalized GO nanosheets. The RAFT-immobilized GO was used for the synthesis of PS nanocomposites in a controlled manner using miniemulsion polymerization. The moelcular weight and dispersity of the PS in the nanocomposites depended on the amount of RAFT-grafted GO in the system, in accordance with the features of the RAFT-mediated polymerization. X-ray diffraction and transmission electron microscopy analyses revealed that the nanocomposites had exfoliated morphology, even at relatively high GO content. The thermal stability and mechanical properties of the PS-GO nanocomposites were better than those of the neat PS polymer. Furthermore, the mechanical properties of the nanocomposites were dependent on the RAFT grafted GO content.

Synthesis of Ce0.8Gd0.05Y0.15O1.9 Nanopowders

2007 ◽  
Vol 336-338 ◽  
pp. 2005-2007
Author(s):  
Xiang Feng Guan ◽  
Zhi Hui Liu ◽  
He Ping Zhou
Keyword(s):  
Electron Microscopy ◽  
Solid Oxide Fuel Cells ◽  
Single Phase ◽  
Fluorite Structure ◽  
Solid Oxide ◽  
Xrd Pattern ◽  
X Ray ◽  
Transmission Electron ◽  
Mean Size ◽  
The Mean

Nanosized Ce0.8Gd0.05Y0.15O1.9 powders were synthesized using glycine nitrate process for use as the electrolyte of intermediate temperature solid oxide fuel cells. The powders were characterized by simultaneous thermogravimetry analysis (TGA) and differential thermal analysis (DTA), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD pattern indicated that the powders exhibited a single phase with cubic fluorite structure. The TEM studies showed that the calcined powders exhibited an almost spherical morphology and the mean size of the particles was 30nm, which is in agreement with the calculated result of XRD.

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