X-ray diffraction and melting-point studies on some long-chain sulfur-containing acids

1958 ◽  
Vol 35 (12) ◽  
pp. 699-703 ◽  
Author(s):  
Lee P. Witnauer ◽  
David Lutz ◽  
N. H. Koenig ◽  
Daniel Swern
Keyword(s):  
Melting Point ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sulfur Containing ◽  
Long Chain

The Influence of Emulsifiers on the Crystal Properties of Tristearin and Trilaurin

1988 ◽  
Vol 3 (1) ◽  
pp. 19-22 ◽  
Author(s):  
J. Schlichter ◽  
I. Mayer ◽  
S. Sarig ◽  
N. Garti
Keyword(s):  
Crystal Structure ◽  
Melting Point ◽  
Diffraction Method ◽  
The Other ◽  
Sorbitan Monostearate ◽  
X Ray Diffraction ◽  
Sorbitan Monolaurate ◽  
X Ray ◽  
Crystal Properties ◽  
Long Chain

AbstractThe effect of solid emulsifiers, added at the level of 10%, on the lattice parameters of tristearin and trilaurin, has been studied by powder X-ray diffraction method. The presence of sorbitan monostearate and glycerol-l-stearate affects slightly the lattice constant a in tristearin; on the other hand, although sorbitan monostearate causes an increase in a of trilaurin, glycerol-l-stearate does not. The presence of sorbitan monolaurate and glycerol-l-laurate affect a of trilaurin similarly to the long chain emulsifiers.A correlation between the effect on a and the increase in melting point has been found.The presence of the emulsifier does not alter drastically the lattice dimensions of the fat. The slight dissimilarity in crystal structure between tristearin and trilaurin is confirmed by the diverse effects of the emulsifiers on the internal structure of the fat.

Structural and thermodynamic properties of nanocrystalline fcc metals prepared by mechanical attrition

1992 ◽  
Vol 7 (7) ◽  
pp. 1751-1761 ◽  
Author(s):  
J. Eckert ◽  
J.C. Holzer ◽  
C.E. Krill ◽  
W.L. Johnson
Keyword(s):  
Thermal Analysis ◽  
Grain Size ◽  
Melting Point ◽  
Grain Boundary ◽  
Bulk Modulus ◽  
Atomic Level ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fcc Metals ◽  
Mechanical Attrition

Nanocrystalline fcc metals have been synthesized by mechanical attrition. The crystal refinement and the development of the microstructure have been investigated in detail by x-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. The deformation process causes a decrease of the grain size of the fcc metals to 6–22 nm for the different elements. The final grain size scales with the melting point and the bulk modulus of the respective metal: the higher the melting point and the bulk modulus, the smaller the final grain size of the powder. Thus, the ultimate grain size achievable by this technique is determined by the competition between the heavy mechanical deformation introduced during milling and the recovery behavior of the metal. X-ray diffraction and thermal analysis of the nanocrystalline powders reveal that the crystal size refinement is accompanied by an increase in atomic-level strain and in the mechanically stored enthalpy in comparison to the undeformed state. The excess stored enthalpies of 10–40% of the heat of fusion exceed by far the values known for conventional deformation processes. The contributions of the atomic-level strain and the excess enthalpy of the grain boundaries to the stored enthalpies are critically assessed. The kinetics of grain growth in the nanocrystalline fcc metals are investigated by thermal analysis. The activation energy for grain boundary migration is derived from a modified Kissinger analysis, and estimates of the grain boundary enthalpy are given.

The Epicuticle of an Arachnid, Palamneus swammerdami

1954 ◽  
Vol s3-95 (31) ◽  
pp. 371-381
Author(s):  
G. KRISHNAN
Keyword(s):  
Outer Membrane ◽  
Diffraction Pattern ◽  
Basal Layer ◽  
Thin Membrane ◽  
Basic Pattern ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chemical Constitution ◽  
Long Chain

The epicuticle of Palamneus swammerdami in the unhardened condition is homogeneous. It stains uniformly red with Mallory. When hardened, it comprises an internal unstained region, giving evidence of --S--S-- bonding, and is bounded externally by a very thin membrane which stains blue with Mallory. The protein of the inner basal layer differs from its counterpart in the insect epicuticle in the absence of tyrosine, in the occurrence of cystine and cysteine, and in being resistant to the action of hot alkalis. Though apparently related to the keratin of vertebrates, it is not identical with it. The outer thin membrane is lipide in nature. X-ray diffraction studies show that the epicuticular protein is unique: it is unlike both arthropodin and the keratin of vertebrates. However, the outer membrane of the epicuticle yields a diffraction pattern indicating the presence of long-chain paraffins and is similar to the outer epicuticle of the blowfly larva. The chitin of the cuticle appears to be identical in pattern with that of insects. In spite of differences in structural and chemical constitution, the epicuticle of the scorpion shows a resemblance to the basic pattern of the insect epicuticle. The differences may be attributed to the absence of phenolic tanning and the occurrence of --S--S-- bonding. The possible role of the purines present in the cuticle of the scorpion is discussed in relation to --S--S-- bonding.

Crystal Structure and Colorimetric Behavior of Low Melting Point Ternary Alloy

2020 ◽  
Vol 1002 ◽  
pp. 12-20
Author(s):  
Tarik T. Issa ◽  
Sadeer M. Majeed ◽  
Duha S. Ahmed
Keyword(s):  
Crystal Structure ◽  
Melting Point ◽  
Mechanical Alloying ◽  
Ternary Alloy ◽  
High Purity ◽  
Milling Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After

Elements of high purity (99.999) ,were used to prepare the alloy , Bi ,Sn,Zn and Cu .Two types alloy Bi – Sn – Zn and Bi – Sn – Cu were prepared by mechanical alloying technique (MA) .Annealing at 100 °Cfor 8 hours was applied for the resulting alloys . X-ray diffraction and differential scanning colorimetriy were tested for the two types of alloy before and after annealing. The best results was noticed in the ternary alloythat prepared at 4 hours milling time ,and annelid at 100 °C, for 8 hours ,under static air.

Metallkomplexe mit funktionalisierten Schwefelliganden, X [1] Ruthenium(II)-und Platin(II)-1-alkin-1-thiolato-Komplexe. Kristallstrukturanalyse von trans-(Ph3P)2Pt[S-C≡C-C(CH3)3]2 / Metal Complexes of Functionalized Sulfur Containing Ligands, X [1] Synthesis of Ruthenium (II) and Platinum(II) 1-Alkyne-1-thiolato Complexes. X-Ray Structure Analysis of trans-( Ph3P)2Pt[C-C≡C-C(CH3)3]2

1996 ◽  
Vol 51 (4) ◽  
pp. 501-505 ◽  
Author(s):  
Wolfgang Weigand ◽  
Michael Weishäupl ◽  
Christian Robl
Keyword(s):  
Crystal Structure ◽  
Metal Complexes ◽  
Structure Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sulfur Containing

Abstract The 1-alkyne-1-thiolates R-C ≡C-SLi [1a: R = C(CH3)3, 1b: R = C6H11 ] react with L2PtCl2 (L = PPh3, 1/2 dppe) and CpRu(PPh3)2Cl, respectively to give the complexes trans-(Ph3P)2Pt[S-C ≡C-C(CH3)3]2 (2a), cis-dppePt[S-C≡C-C(CH3)3]2 (2b), and CpRu(PPh3)2-(S-C ≡ C-R) [3a: R = C(CH3)3, 3b: R = C6H11]. 2a has been characterized by 31P CP/MAS NM R spectroscopy and its crystal structure determined by X-ray diffraction.

Anti-mycobacterial activities of copper(II) salicylaldimine complexes derived from long-chain aliphatic amines

2013 ◽  
Vol 91 (11) ◽  
pp. 1093-1097 ◽  
Author(s):  
Alyssa E. Patterson ◽  
Eric G. Bowes ◽  
Allyson Bos ◽  
Taryn O’Neill ◽  
Haoxin Li ◽  
...  
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Schiff Base ◽  
Aliphatic Amines ◽  
Schiff Base Complexes ◽  
Aliphatic Chain ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted ◽  
Long Chain

Twelve copper(II) Schiff base complexes derived from lipophilic amines have been prepared using either salicylaldehyde or ortho-vanillin via a microwave-assisted reaction. All complexes have been obtained elementally pure and an X-ray diffraction of an isopentyl derivative has confirmed the structure of these compounds. All complexes showed a promising degree of anti-mycobacterial activity against Mycobacterium tuberculosis, where activity seemed to increase with an increase in the length of the aliphatic chain.

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