Experimental and microscopic investigations of the performance of copolymer thickeners in supercritical CO2

2020 ◽  
Vol 226 ◽  
pp. 115857
Author(s):  
Wenchao Sun ◽  
Haige Wang ◽  
Yongjin Zha ◽  
Jing Yu ◽  
Jiaqi Zhang ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Microscopic Investigations

Convergent Beam Electron Diffraction

1978 ◽  
Vol 36 (3) ◽  
pp. 304-315
Author(s):  
G. Lehmpfuhl
Keyword(s):  
Electron Diffraction ◽  
Diffraction Pattern ◽  
Crystal Surface ◽  
Diffraction Spot ◽  
Crystal Thickness ◽  
Large Area ◽  
Electron Microscopic ◽  
Additional Information ◽  
Microscopic Investigations

Introduction In electron microscopic investigations of crystalline specimens the direct observation of the electron diffraction pattern gives additional information about the specimen. The quality of this information depends on the quality of the crystals or the crystal area contributing to the diffraction pattern. By selected area diffraction in a conventional electron microscope, specimen areas as small as 1 µ in diameter can be investigated. It is well known that crystal areas of that size which must be thin enough (in the order of 1000 Å) for electron microscopic investigations are normally somewhat distorted by bending, or they are not homogeneous. Furthermore, the crystal surface is not well defined over such a large area. These are facts which cause reduction of information in the diffraction pattern. The intensity of a diffraction spot, for example, depends on the crystal thickness. If the thickness is not uniform over the investigated area, one observes an averaged intensity, so that the intensity distribution in the diffraction pattern cannot be used for an analysis unless additional information is available.

Determination of the phase structure of polymerblends by electron microscopy

1978 ◽  
Vol 36 (1) ◽  
pp. 492-493
Author(s):  
Dr. G. Kaemof
Keyword(s):  
Screw Extruder ◽  
Electron Microscopic ◽  
Thin Sections ◽  
Single Screw Extruder ◽  
Transmission Electron ◽  
The Matrix ◽  
Twin Screw ◽  
Special Case ◽  
Microscopic Investigations

A mixture of polycarbonate (PC) and styrene-acrylonitrile-copolymer (SAN) represents a very good example for the efficiency of electron microscopic investigations concerning the determination of optimum production procedures for high grade product properties.The following parameters have been varied:components of charge (PC : SAN 50 : 50, 60 : 40, 70 : 30), kind of compounding machine (single screw extruder, twin screw extruder, discontinuous kneader), mass-temperature (lowest and highest possible temperature).The transmission electron microscopic investigations (TEM) were carried out on ultra thin sections, the PC-phase of which was selectively etched by triethylamine.The phase transition (matrix to disperse phase) does not occur - as might be expected - at a PC to SAN ratio of 50 : 50, but at a ratio of 65 : 35. Our results show that the matrix is preferably formed by the components with the lower melting viscosity (in this special case SAN), even at concentrations of less than 50 %.

Anti-diabetic properties of non-polar Toona sinensis Roem extract prepared by supercritical-CO2 fluid

Planta Medica ◽  
2012 ◽  
Vol 78 (11) ◽  
Author(s):  
YH Tsai ◽  
TJ Hsieh ◽  
MC Liao ◽  
PJ Lien ◽  
CC Sun ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Toona Sinensis ◽  
Supercritical Co2 Fluid

Geophysical Monitoring of Gaseous and Supercritical CO2 Fracture Flow Through a Brine-Saturated Shale Caprock

2019 ◽  
Author(s):  
Mohammad Nooraiepour ◽  
Magnus Soldal ◽  
Joonsang Park ◽  
Nazmul Haque Mondal ◽  
Helge Hellevang ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Fracture Flow ◽  
Geophysical Monitoring ◽  
Flow Through

Green Chemistry and Green Solvents: An Overview

2020 ◽  
Vol 7 (3) ◽  
pp. 314-325
Author(s):  
Barla Karuna Devi ◽  
Swathi Naraparaju ◽  
Chaganti Soujanya ◽  
Sayan Dutta Gupta
Keyword(s):  
Ionic Liquids ◽  
Green Chemistry ◽  
Chemical Reaction ◽  
Supercritical Co2 ◽  
Environmental Problems ◽  
Green Solvents ◽  
Eutectic Mixtures ◽  
Organic Carbonates

: Green chemistry emphasizes designing novel routes to overcome health and environmental problems that occur during a chemical reaction. Green solvents are used in place of conventional solvents that are hazardous to both human and the environment. Solvents like water, ionic liquids, supercritical CO2, biosolvents, organic carbonates, and deep eutectic mixtures can be used as green solvents. The review focuses on the properties, applications, and limitations of these solvents.

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