The Reinforcing Mechanism of Recycled Glass Fibers and Milled Glass Fibers in Polypropylene Composites

2014 ◽  
Vol 915-916 ◽  
pp. 755-759 ◽  
Author(s):  
Yu Hua Qiao ◽  
Huai Min Miao ◽  
Yong Biao Xu ◽  
Wei Jiang ◽  
Yan Hong Zheng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Glass Fibers ◽  
Polypropylene Composites ◽  
Recycled Glass ◽  
The Past ◽  
Global Demand ◽  
Pp Composites ◽  
Fiber Materials ◽  
Scanning Electron

A great amount of work has been done over the past few years to use the glass fibers reinforcing polypropylene (PP) composites. Due to the sharp resources recovery, and the global demand for fiber materials, there has been growing interest in the use of the recycled glass fibers (GF) (RGF) as an alternative. This work focuses on the reinforcing mechanisms of the glass fibers in PP composites. The reinforcing mechanism is evaluated by scanning electron microscopy (SEM) on the basis of the energy dissipation theory. The GF are the excellent supporting bodies. Interfacial debonding, fiber pullout and breakage dissipate tremendous energy. These factors cause improvements in the strength of the RGF/PP and MGF/PP composites.

Ultrastructural Analysis of the Salivary Glands of Gromphadorhina Portentosa (Schaum)

1977 ◽  
Vol 35 ◽  
pp. 638-639
Author(s):  
P.J. Dailey
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Salivary Glands ◽  
Secretory Vesicles ◽  
The Past ◽  
Transmission Electron ◽  
Means Of Transmission ◽  
Gromphadorhina Portentosa ◽  
Scanning Electron ◽  
Topographical Relief

The structure of insect salivary glands has been extensively investigated during the past decade; however, none have attempted scanning electron microscopy (SEM) in ultrastructural examinations of these secretory organs. This study correlates fine structure by means of SEM cryofractography with that of thin-sectioned epoxy embedded material observed by means of transmission electron microscopy (TEM).Salivary glands of Gromphadorhina portentosa were excised and immediately submerged in cold (4°C) paraformaldehyde-glutaraldehyde fixative1 for 2 hr, washed and post-fixed in 1 per cent 0s04 in phosphosphate buffer (4°C for 2 hr). After ethanolic dehydration half of the samples were embedded in Epon 812 for TEM and half cryofractured and subsequently critical point dried for SEM. Dried specimens were mounted on aluminum stubs and coated with approximately 150 Å of gold in a cold sputtering apparatus.Figure 1 shows a cryofractured plane through a salivary acinus revealing topographical relief of secretory vesicles.

Eyeing the past: synchrotron µ-XANES and XRF imaging of tarnish distribution on 19th century daguerreotypes

2019 ◽  
Vol 26 (5) ◽  
pp. 1679-1686 ◽  
Author(s):  
M. S. Kozachuk ◽  
T. K. Sham ◽  
R. R. Martin ◽  
A. J. Nelson ◽  
I. Coulthard
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Synchrotron Radiation ◽  
National Gallery ◽  
Edge Structure ◽  
X Ray ◽  
The Past ◽  
National Gallery Of Canada ◽  
X Ray Absorption ◽  
Scanning Electron

Louis-Jacques-Mandé Daguerre introduced the first successful photographic process, the daguerreotype, in 1839. Tarnished regions on daguerreotypes supplied by the National Gallery of Canada were examined using scanning electron microscopy energy-dispersive X-ray spectroscopy and synchrotron-radiation analysis. Synchrotron X-ray fluorescence imaging visualized the distribution of sulfur and chlorine, two primary tarnish contributors, and showed that they were associated with the distribution of image particles on the surface. X-ray absorption near-edge structure spectroscopy determined the tarnish to be primarily composed of AgCl and Ag2S. Au2S, Au2SO4, HAuCl4 and HgSO4 were also observed to be minor contributors. Environmental contamination may be a source of these degradation compounds. Implications of these findings will be discussed.

scholarly journals Description of nymphs and ontogenetic morphometry of Triatoma ryckmani Zeledón & Ponce, 1972 (Hemiptera: Heteroptera: Reduviidae: Triatominae)

2020 ◽  
Vol 13 ◽  
pp. e899
Author(s):  
Dayse da Silva Rocha ◽  
Carolina Dale ◽  
João Aristeu Da Rosa ◽  
Cleber Galvão
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central America ◽  
Control Strategies ◽  
Postembryonic Development ◽  
Disease Vectors ◽  
Immature Stages ◽  
Identification Process ◽  
The Past ◽  
Scanning Electron

Triatoma ryckmani Zeledón & Ponce, 1972 is a species found in sylvatic habitat at Central America. Considered rare in the past and poorly studied, nowadays can be found inside houses with potential of dispersal and colonization. All five instars of T. ryckmani are described based on optical and scanning electron microscopy. The postembryonic development of the head analyzed by ontogenetic morphometry showed the largest changes occur in the first three instars. Information about morphology of the immature stages of disease vectors can be helpful in the identification process increasing speed and efficiency of control strategies.

Scanning Electron Microscopy image analysis of fiber glass insulation

1992 ◽  
Vol 50 (2) ◽  
pp. 994-995
Author(s):  
H. Talbot ◽  
D. Jeulin ◽  
L.W. Hobbs
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Image Analysis ◽  
Glass Fibers ◽  
Insulation Material ◽  
Glass Insulation ◽  
Microscopy Image ◽  
Microscopy Image Analysis ◽  
Environmental Sem ◽  
Scanning Electron

Glass wool, made of chemically bound glass fibers which trap stagnant air, has been used in a variety of applications as phonic and thermic insulation material. Mechanical and insulating qualities of the material depend heavily on the characteristics of the fibers themselves. Aside from the composition of the glass, the length and diameter distributions of the fibers within the material can be related to these characteristics. A fast and reliable means for obtaining these size distributions is therefore a crucial issue for quality control.Scanning electron microscopy (SEM) imaging was used to access sub-micron dimensions of the fibers; and image analysis, as opposed to manual procedures, was used for obtaining measurements.Samples of clean raw fibers (free of binder) were dispersed with ultrasound into a pH 9 aqueous solution and later deposited on a track-etched polycarbonate filter with 0.2 μm pore size. The filter was then dried, coated, and observed in BSE mode in a standard SEM, or left uncoated and observed in an environmental SEM (ESEM).

Effects of Aluminum Oxide on Combustion Behavior of Intumescent Fire-Retarded Polypropylene Composites

2011 ◽  
Vol 120 ◽  
pp. 598-602
Author(s):  
Shan Hu ◽  
Hui Jing ◽  
Jun Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Oxide ◽  
Oxygen Index ◽  
Al2o3 Content ◽  
Reaction Products ◽  
Limiting Oxygen Index ◽  
Polypropylene Composites ◽  
Melamine Phosphate ◽  
Scanning Electron

The melamine phosphate (MP) was synthesized from melamine and phosphate acid. Aluminum oxide (Al2O3) was added into the MP during its synthesis. Fourier transform infrared spectroscopy (FTIR) was used to characterize the reaction products. The composites were prepared from polypropylene (PP) and intumescent flame retardant (IFR) additives of MP and pentaerythritol (PER). The effect of Al2O3 content on the properties of the composites was investigated by the limiting oxygen index (LOI), thermogravimetry (TG) and scanning electron microscopy (SEM). The results indicated that the LOI value of the composites could be enhanced obviously with suitable content of Al2O3. When the Al2O3 content was 6 wt% in MP, the LOI value increased to 35.5% from 31.0% for the composite without Al2O3, the amount of residual char at 600°C increased from 8.9 wt% to 13.9 wt%.

Mechanical Properties and Morphology of Long Glass Fiber Reinforced PP Composites

2013 ◽  
Vol 652-654 ◽  
pp. 93-97 ◽  
Author(s):  
Jian Bing Guo ◽  
Kai Zhou Zhang ◽  
Dao Hai Zhang ◽  
Bin Wu ◽  
Min He ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Interfacial Adhesion ◽  
Mechanical Analysis ◽  
Interfacial Interaction ◽  
Glass Fiber Reinforced ◽  
Long Glass Fiber ◽  
Pp Composites ◽  
Scanning Electron

The effects of polypropylene grafted with maleic anhydride (PP-g-MA) on the interfacial interaction of PP/GF composites were investigated by means of scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), and mechanical properties. The experimental results demonstrate that PP-g-MA could effectively improve interfacial interaction between the PP and LGF. Based on SEM, good interfacial adhesion between PP and LGF in PP/PP-g-MA/LGF（66.5/3.5/30） composites was observed. All results in this paper were consistent, and showed the good interaction between PP and LGF, which were proved by the mechanical properties of the composites.

Complete transposition in a chick embryo demonstrated by scanning electron microscopy

1998 ◽  
Vol 8 (3) ◽  
pp. 396-399 ◽  
Author(s):  
Jörg Männer ◽  
Wolfgang seidl ◽  
Gerd Steding
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Animal Models ◽  
Chick Embryo ◽  
Chick Embryos ◽  
Documented Case ◽  
The Past ◽  
Complete Transposition ◽  
Developing Heart ◽  
Scanning Electron

AbstractChick embryos are frequently used as animal models when researching the developing heart. In the past, every attempt to induce complete transposition (the combination of concordant arrioventricular and discordant ventriculo-arterial connections) failed in chicks, suggesting that it might be impossible to develop a chicken modle for this malformation. We demonstrate, to the best of our knowledge, the first well-documented case of complete transpositon occourrine in the chick

Study of Corrosion Damage of Glass Fibers in Textile Fiberglass Reinforcement under Expositions Simulating Concrete Environment

2018 ◽  
Vol 272 ◽  
pp. 189-196
Author(s):  
Tomáš Bittner ◽  
Petr Pokorný ◽  
Petr Bouška ◽  
Šárka Nenadálová
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Glass Fiber ◽  
High Stability ◽  
Pore Solution ◽  
Glass Fibers ◽  
Corrosion Damage ◽  
Organic Coating ◽  
Ft Ir ◽  
Scanning Electron

The main point of this paper is to assess the level of corrosion damage of the composite textile fiberglass reinforcement in environments that simulate the concrete pore solution by the techniques of FT-IR (Fourier transform infrared spectroscopy), SEM (scanning electron microscopy) as well as EDS (scanning electron microscopy). Effect of corrosion on the tensile strength segmented textile glass fiber was tested and also it was investigated specific type of protective organic coating on glass fiber. The results express the evidence of local corrosion damage on the examined samples just at pH 13.5, and on the contrary high stability in the environment simulating carbonated concrete and concrete contaminated by chloride anions. The thesis also points on the unevenness of the excluded protective organic coating with localized porosity which relates to the above mentioned corrosion damage.

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