The Effect of Temperature on the Dispersion of a-Mangostin in PNIPAM Microgel System

2012 ◽  
Vol 9 (2) ◽  
pp. 21
Author(s):  
Madihah Ahmad ◽  
Bohari Yamin ◽  
Azwan Mat Lazim
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Electron Microscope ◽  
Spectroscopic Data ◽  
Effect Of Temperature ◽  
Garcinia Mangostana ◽  
Transmission Electron ◽  
Uv Visible ◽  
Microgel Solution ◽  
Increasing Temperature ◽  
Fluorescence Peak

a-Mangostin was extracted from the pericarp of the Malaysian local Garcinia mangostana linn., The structure was characterised by Infrared red, UV-Visible and Nuclear Magnetic Resonance spectroscopic data. The fluorescence peak at 500nm in ethanol was not observed in PNIPAM microgel solution. The increase of colloidal size of the gel in the presence of a-mangostin was studied by Dynamic Light Scattering and Transmission Electron Microscope. The size of the particle also increases with increasing temperature up to 45°C after which it began to shrink. The TEM micrograph at 45°C showed a uniformly structured pattern of the gel occurs in the range of the lowest solution critical temperature.

The Effect of Temperature on the Dispersion of a-Mangostin in PNIPAM Microgel System

2012 ◽  
Vol 9 (2) ◽  
pp. 21
Author(s):  
Madihah Ahmad ◽  
Bohari M Yamin ◽  
Mohamad Azwani Shah Mat Lazim
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Electron Microscope ◽  
Spectroscopic Data ◽  
Effect Of Temperature ◽  
Garcinia Mangostana ◽  
Transmission Electron ◽  
Uv Visible ◽  
Microgel Solution ◽  
Increasing Temperature ◽  
Fluorescence Peak

u-Mangostin was extracted from the pericarp of the Malaysian local Garcinia mangostana linn., The structure was characterised by Infrared red, UV-Visible and Nuclear Magnetic Resonance spectroscopic data. The fluorescence peak at 500nm in ethanol was not observed in PNIPAM microgel solution. The increase of colloidal size of the gel in the presence of u-mangostin was studied by Dynamic Light Scattering and Transmission Electron Microscope. The size of the particle also increases with increasing temperature up to 45°C after which it began to shrink. The TEM micrograph at 45°C showed a uniformly structured pattern of the gel occurs in the range of the lowest solution critical temperature.

In situ transmission electron microscope measurements of solid Al-solid Pb and solid Al-liquid Pb surface-energy anisotropy in rapidly solidified Al-5% Pb (by mass)

1987 ◽  
Vol 414 (1847) ◽  
pp. 499-507 ◽  
Keyword(s):  
Electron Microscope ◽  
Melting Point ◽  
Surface Energy ◽  
Transmission Electron Microscope ◽  
Room Temperature ◽  
Transmission Electron ◽  
Increasing Temperature ◽  
Rapidly Solidified ◽  
Al Matrix

Alloys of Al-5% Pb and Al-5% Pb-0.5% Si (by mass) have been manufactured by rapid solidification and then examined by transmission electron microscopy. The rapidly solidified alloy microstructures consist of 5-60 nm Pb particles embedded in an Al matrix. The Pb particles have a cube-cube orientation relation with the Al matrix, and are cub-octahedral in shape, bounded by {100} Al, Pb and {111} Al, Pb facets. The equilibrium Pb particle shape and therefore the anisotropy of solid Al-solid Pb and solid Al-liquid Pb surface energies have been monitored by in situ heating in the transmission electron microscope over the temperature range between room temperature and 550°C. The ani­sotropy of solid Al-solid Pb surface energy is constant between room temperature and the Pb melting point, with a {100} Al, Pb surface energy about 14% greater than the {111} Al, Pb surface energy, in good agreement with geometric near-neighbour bond energy calculations. The {100} AI, Pb facet disappears when the Pb particles melt, and the anisotropy of solid Al-liquid Pb surface energy decreases gradually with increasing temperature above the Pb melting point, until the Pb particles become spherical at about 550°C.

Effect of temperature on beam damage of asbestos fibers in the transmission electron microscope (TEM) at 100kV

Micron ◽  
2017 ◽  
Vol 94 ◽  
pp. 26-36 ◽  
Author(s):  
Joannie Martin ◽  
Martin Beauparlant ◽  
Sébastien Sauvé ◽  
Gilles L’Espérance
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Effect Of Temperature ◽  
Asbestos Fibers ◽  
Transmission Electron ◽  
Beam Damage

Research on Microstructure Evolution of Spray Forming FVS0812 Alloy Varies with Temperature

2014 ◽  
Vol 543-547 ◽  
pp. 3729-3732
Author(s):  
Rong Hua Zhang ◽  
Biao Wu ◽  
Xiao Ping Zheng
Keyword(s):  
Electron Microscope ◽  
High Temperature ◽  
Energy Dispersive Spectrometer ◽  
Temperature Stability ◽  
Optical Microscope ◽  
Spray Forming ◽  
Effect Of Temperature ◽  
High Temperature Stability ◽  
Transmission Electron ◽  
Microstructure Of The Material

Heat-resistant FVS0812 alloys were prepared by spray forming technique. The effect of temperature on microstructure the alloys was studied by optical microscope (OM), transmission electron microscope (TEM) with energy dispersive spectrometer (EDS), differential scanning calorimeter (DSC) in this paper. The research results show that the microstructure of the material doesnt change obviously after being hold for 3 hours at 420°C temperature. When the temperature is over 420°C, the second coarse phases are found in the alloy. The studies on the microstructure of the alloy exposed at 400°C for 100 hours show that the alloy has excellent high temperature stability.

Effect of Temperature and Vapor-phase Encapsulation on Particle Growth and Morphology

1999 ◽  
Vol 14 (4) ◽  
pp. 1664-1671 ◽  
Author(s):  
Sheryl H. Ehrman ◽  
Maria I. Aquino-Class ◽  
Michael R. Zachariah
Keyword(s):  
Particle Size ◽  
Vapor Phase ◽  
Particle Growth ◽  
Effect Of Temperature ◽  
Transmission Electron Micrograph ◽  
Transmission Electron ◽  
Size And Morphology ◽  
Silicon And Germanium ◽  
Increasing Temperature

The effect of in situ vapor phase salt-encapsulation on particle size and morphology was systematically investigated in a sodium co-flow/furnace reactor. The temperature of the furnace was varied, and the primary particle size and degree of agglomeration of the resulting silicon and germanium particles were determined from transmission electron micrograph images of particles sampled in situ. Particle size increased with increasing temperature, a trend expected from our understanding of particle formation in a high-temperature process in the absence of an encapsulant. Germanium, which coalesces faster than silicon, formed larger particles than silicon at the same temperatures, also in agreement with observations of particle growth in more traditional aerosol processes. At the highest temperatures, unagglomerated particles were formed, while at low temperatures, agglomerated particles were formed, with agglomerate shape following the shape of the salt coating.

Physical Properties of the Amorphous Silica Encapsulated Fluorescence Dye

2013 ◽  
Vol 686 ◽  
pp. 285-289
Author(s):  
Zakaria Nor Dyana ◽  
Abdul Razak Khairunisak ◽  
Abdul Aziz Azlan
Keyword(s):  
Electron Microscope ◽  
Effect Of Temperature ◽  
Halogen Lamp ◽  
X Ray Diffraction ◽  
Dye Tracing ◽  
X Ray ◽  
Synthesis Parameters ◽  
Transmission Electron ◽  
Fluorescence Dye ◽  
Silica Precursor

Amorphous nanosilica entrapped fluorescence dye intended to be used as tracing agent for imaging of cell or tissue in human cell was prepared using micelle entrapment approach. Micelles were produced by mixing a surfactant in water with additives such as butanol and ammonia in a preheated bioreactor. Then, 1,1%-dioctadecyl-3,3,3%,3% tetramethylindocarbocyanine perchlorate (DiI) dye tracing agent was added into the mixture followed by the addition of silica precursor. The parameters studied including effect of surfactant amount, effect of temperature and amount of Si precursor. Silica encapsulated DiI produced were then characterized using Transmission Electron Microscope (TEM), X-ray diffraction (XRD) and UV-Vis NIR spectrophotometer. Dynamic light scattering (DLS) showed that tunable size of nanoparticles in the range of 30-150 nm can be produced by varying synthesis parameters. The results showed that the silica encapsulated DiI became bigger and uniform in size with the increase of temperature and amount of surfactant. The silica encapsulated with DiI is photostable which the intensity of fluorescence value is 279.12 after 90 minutes exposure to halogen lamp (200W) compared to bare DiI that degraded to 100.61.

The Effect of Temperature on the Structure of Cotton Carbon Fiber by Chemical Vapor Deposition

2015 ◽  
Vol 781 ◽  
pp. 671-674
Author(s):  
Jindamanee Nissayan ◽  
Saifon Kruehong ◽  
Chaiyaput Kruehong ◽  
Apichat Artnaseaw
Keyword(s):  
Chemical Vapor Deposition ◽  
Electron Microscope ◽  
Carbon Fibers ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Average Diameter ◽  
Effect Of Temperature ◽  
Synthesis Process ◽  
Transmission Electron ◽  
Different Temperatures

Synthesis of carbon fibers of cotton by chemical vapor deposition (CDV) method is the main focus of this study. Having ferocene as the catalyst, the study explored effects of synthesis process at different temperatures (750°C, 850°C and 950°C). Analysis of size, shape and structure were conducted using scanning electron microscope (SEM), transmission electron microscope (TEM) and Raman spectroscope. The result showed that average diameter of carbon fibers tended to increase according to temperature. In addition, it was found that surface of the fiber is bend and helical. Also, higher temperature affected graphitic of the fiber.

IN SITU ASSEMBLY OF ZnS NANOFIBERS WITH HIGHLY ORDERED LAMELLAR MESOSTRUCTURE

2006 ◽  
Vol 05 (02n03) ◽  
pp. 245-251 ◽  
Author(s):  
JUNPING LI ◽  
YAO XU ◽  
DONG WU ◽  
YUHAN SUN
Keyword(s):  
Electron Microscope ◽  
Thermal Analyses ◽  
Blue Shift ◽  
X Rays ◽  
Energy Dispersive Analysis ◽  
Visible Absorption ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible

ZnS nanofibers with lamellar mesostructure could be built up from in situ generated ZnS precursors via hydrothermal routes using neutral n-alkylamines as structure-directing template and ethylene diamine tetraacetic acid (EDTA) as stabilizer. The morphology and structure of the obtained products were thoroughly investigated via scanning electron microscope (SEM), energy dispersive analysis of X-rays (EDX), transmission electron microscope (TEM), X-ray powder diffraction (XRD) and thermal analyses. HRTEM and XRD results revealed that the so-produced nanofibers were lamellar mesostructure and its framework was built of crystalline wurtzite ZnS . It was also found that the distance between the layers was proportional to the chain length of the alkylamine. The UV-visible absorption spectrum showed that the nanofibers exhibited strong quantum-confined effect with a blue shift in the band gap. Finally, a probable mechanism for the assembly of the nanofibers was also proposed.

scholarly journals Toxicity of internalized laser generated pure silver nanoparticles to the isolated rat hippocampus cells

2017 ◽  
Vol 33 (7) ◽  
pp. 555-563 ◽  
Author(s):  
Canan Kursungoz ◽  
Sadık Taşkın Taş ◽  
Mustafa F Sargon ◽  
Yıldırım Sara ◽  
Bülend Ortaç
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Laser Ablation ◽  
Hippocampal Slices ◽  
Dependent Manner ◽  
Major Mechanism ◽  
Laser Ablation Method ◽  
Transmission Electron ◽  
Uv Visible ◽  
Dose Dependent

Silver nanoparticles (AgNPs) are the most commonly used nanoparticles (NPs) in medicine, industry and cosmetics. They are generally considered as biocompatible. However, contradictory reports on their biosafety render them difficult to accept as ‘safe’. In this study, we evaluated the neurotoxicity of direct AgNP treatment in rat hippocampal slices. We produced pure uncoated AgNPs by a pulsed laser ablation method. NP characterization was performed by Ultraviolet (UV) visible spectrophotometer, scanning electron microscope, transmission electron microscope (TEM) and energy-dispersive X-ray spectroscopy. Rat hippocampal slices were treated with AgNPs for an hour. AgNP exposure of hippocampal tissue resulted in a significant decrease in cell survival in a dose-dependent manner. Our TEM results showed that AgNPs were distributed in the extracellular matrix and were taken into the cytoplasm of the neurons. Moreover, we found that only larger AgNPs were taken into the neurons via phagocytosis. This study showed that the pure AgNPs produced by laser ablation are toxic to the neural tissue. We also found that neurons internalized only the large NPs by phagocytosis which seems to be the major mechanism in AgNP neurotoxicity.

Comparative Biocompatibilities of Various Sizes of AgCIT and AgPVP with their Protein Coronas Nanoparticles

2021 ◽  
Vol 43 (5) ◽  
pp. 513-513
Author(s):  
Abdul Hameed Abdul Hameed ◽  
Komal Saba Komal Saba ◽  
Raheela Taj Raheela Taj ◽  
Andaleeb Azam Andaleeb Azam ◽  
Rohullah and Amna Paracha Rohullah and Amna Paracha
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Biomedical Applications ◽  
Cytotoxic Effect ◽  
Human Hepatoma ◽  
Hepg2 Cell Line ◽  
Supported Nanoparticles ◽  
Transmission Electron ◽  
Uv Visible ◽  
20 Nm

Biocompatibilities of nanoparticles are crucial for biomedical applications. Diverse silver nanoparticles (5 nm, 10 nm, 20 nm, 40 nm and 80 nm) caped with citrate and polyvinylpyrrolidone (PVP) were synthesized and primed their protein coronas. Nanoparticles were characterized with UV-visible spectroscope, Dynamic light scattering (DLS) and Transmission Electron Microscope (TEM). Comparative biocompatibilities were verified and recorded using MTS techniques. Human hepatoma carcinoma HepG2) cell line was used for measuring cytotoxic effect by MTS assays. Deleterious and comparative behaviors of citrate and PVP supported nanoparticles with varied dimensions were investigated and concluded; that citrate caped nanoparticles are comparatively less toxic and independent of size than PVP supported nanoparticles, having increased cytotoxicity with increasing size. The cytotoxic effect of citrate caped and its protein coronas nanoparticles was insignificant, while the boosted concentration of PVP supported nanoparticles enhanced the toxic effect, which endorsed enlarged size and amount of PVP supported nanoparticles. As medicinal precursors, the overwhelming use of PVP nanoparticles should be avoided, and a unique protocol must be designed if its use is crucial and unavoidable.

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