Structural and chemical characteristics of model molecular fragments petroleum resins

2018 ◽  
Vol 59 (3) ◽  
Author(s):  
S.A. Shutkova ◽  
◽  
M.Yu. Dolomatov ◽  
M.M. Dolomatova ◽  
A.M. Petrov ◽  
...  
Keyword(s):  
Chemical Characteristics ◽  
Molecular Fragments

Structural and Chemical Characteristics of Model Molecular Fragments of Petroleum Resins

2018 ◽  
Vol 59 (3) ◽  
pp. 550-554
Author(s):  
S. A. Shutkova ◽  
M. Yu. Dolomatov ◽  
M. M. Dolomatova ◽  
A. M. Petrov ◽  
I. R. Kharudinov
Keyword(s):  
Chemical Characteristics ◽  
Molecular Fragments

Structural and chemical characteristics of model molecular fragments of petroleum asphaltenes

2012 ◽  
Vol 52 (4) ◽  
pp. 267-271 ◽  
Author(s):  
S. A. Shutkova ◽  
M. Yu. Dolomatov ◽  
S. V. Dezortsev
Keyword(s):  
Chemical Characteristics ◽  
Molecular Fragments ◽  
Petroleum Asphaltenes

Characterization of defects in tabular silver halide grains

1990 ◽  
Vol 48 (4) ◽  
pp. 1046-1047
Author(s):  
C. Goessens ◽  
D. Schryvers ◽  
J. Van Landuyt ◽  
A. Verbeeck ◽  
R. De Keyzer
Keyword(s):  
Radiation Damage ◽  
Silver Halide ◽  
Chemical Characteristics ◽  
X Ray ◽  
Free Region ◽  
Central Defect ◽  
Crystallographic Defects ◽  
Physical And Chemical ◽  
Two Sides

Silver halide grains (AgX, X=Cl,Br,I) are commonly recognized as important entities in photographic applications. Depending on the preparation specifications one can grow cubic, octahedral, tabular a.o. morphologies, each with its own physical and chemical characteristics. In the present study crystallographic defects introduced by the mixing of 5-20% iodide in a growing AgBr tabular grain are investigated. X-ray diffractometry reveals the existence of a homogeneous Ag(Br1-xIx) region, expected to be formed around the AgBr kernel. In fig. 1 a two-beam BF image, taken at T≈100 K to diminish radiation damage, of a triangular tabular grain is presented, clearly showing defect contrast fringes along four of the six directions; the remaining two sides show similar contrast under relevant diffraction conditions. The width of the central defect free region corresponds with the pure AgBr kernel grown before the mixing with I. The thickness of a given grain lies between 0.15 and 0.3 μm: as indicated in fig. 2 triangular (resp. hexagonal) grains exhibit an uneven (resp. even) number of twin interfaces (i.e., between + and - twin variants) parallel with the (111) surfaces. The thickness of the grains and the existence of the twin variants was confirmed from CTEM images of perpendicular cuts.

Inorganic and organic chemical characteristics and sources of suspended particulate matters in Ulaanbaatar, Mongolia

2020 ◽  
Vol 54 (4) ◽  
pp. 267-276
Author(s):  
Koshi Yamamoto ◽  
Yuta Suzuki ◽  
Gochoobazar Oyunjargal ◽  
Hiroyuki Fukuda ◽  
Munkhtsetseg Oidov ◽  
...  
Keyword(s):  
Organic Chemical ◽  
Chemical Characteristics ◽  
Particulate Matters ◽  
Suspended Particulate ◽  
Suspended Particulate Matters ◽  
Inorganic And Organic
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