Symmetric and asymmetric cleavage of the lighter boron hydrides and of metal salts – the role of the dielectric constant

2000 ◽  
Vol 614-615 ◽  
pp. 5-9 ◽  
Author(s):  
Robert W. Parry
Keyword(s):  
Dielectric Constant ◽  
Metal Salts ◽  
Boron Hydrides

scholarly journals GREEN SYNTHESIS OF PLANT-MEDIATED METAL NANOPARTICLES: THE ROLE OF POLYPHENOLS

2019 ◽  
pp. 75-84 ◽  
Author(s):  
LATIF MS ◽  
ABBAS S ◽  
KORMIN F ◽  
MUSTAFA MK
Keyword(s):  
Metal Nanoparticles ◽  
Biomedical Applications ◽  
Cost Effective ◽  
Metal Salts ◽  
Chemical Methods ◽  
Physical And Chemical ◽  
Labor Consuming ◽  
Day By Day ◽  
Biological Actions

The use of metal nanoparticles (MNPs) in various fields is increasing day-by-day leading to a genuine concern about the issues related to their environmental and biological safety. The major approaches for the synthesis of NPs include physical and chemical methods which are expensive and hazardous to health in addition to being toxic to the environment. This review highlights the potential of plant extracts to carry out the synthesis of MNPs with a special emphasis on the role of flavonoids in nanosynthesis. This green and clean approach have been actively utilized in recent years as an alternative to conventional hazardous approaches. It has proved as cost-effective, non-toxic, less time and labor consuming, efficient, and eco-friendly method for the synthesis of MNPs with specific biological actions. This review also focuses on the role of polyphenols, including the flavonoids as bioreductants of metal salts for the synthesis of NPs along with their biomedical applications. Various examples of the MNPs, along with their biological actions, have also been summarized.

SYNTHESIS OF METAL AND METAL OXIDE NANOPARTICLES IN THE NANOSPACE OF ULTRATHIN TiO2-Gel FILMS: ROLE OF THE ION-EXCHANGE SITE

2002 ◽  
Vol 01 (05n06) ◽  
pp. 507-513
Author(s):  
JUNHUI HE ◽  
IZUMI ICHINOSE ◽  
SHIGENORI FUJIKAWA ◽  
TOYOKI KUNITAKE
Keyword(s):  
Ion Exchange ◽  
Metal Ions ◽  
Metal Oxide Nanoparticles ◽  
Current Approach ◽  
Metal Salts ◽  
Lanthanide Elements ◽  
Exchange Site ◽  
Probable Distribution ◽  
Tio2 Gel

In this work, we showed that metal salts were easily deposited as aggregates (e.g., ultrathin planar microcrystals) on the surface of TiO 2- gel films in the absence of ion-exchange sites. In contrast, metal ions were efficiently incorporated into ultrathin TiO 2- gel films, when ion-exchange sites were created using Mg ( O - Et )2 as template. A variety of metal ions, including those of main group, transition, and lanthanide elements were successfully doped into TiO 2 thin films by the current approach. Probable distribution of the ion-exchange site in the film interior was discussed.

Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3

2017 ◽  
Vol 100 (7) ◽  
pp. 3042-3049 ◽  
Author(s):  
Wei Ni ◽  
Jianglin Ye ◽  
Youmin Guo ◽  
Chao Cheng ◽  
Zhongqin Lin ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Mixed Valence ◽  
Decisive Role ◽  
Valence Structure ◽  
Colossal Dielectric Constant

Milk stability in ethanolic solutions

1989 ◽  
Vol 56 (3) ◽  
pp. 521-527 ◽  
Author(s):  
Alice Pierre
Keyword(s):  
Amino Acids ◽  
Dielectric Constant ◽  
Linear Relation ◽  
Sodium Caseinate ◽  
Alcoholic Mixtures ◽  
Ethanol Ethanol ◽  
Important Constituent

SummaryWe have investigated the role of pH in the destabilization of milk and sodium caseinate solutions by ethanol. Ethanol shifted the pH of minimum stability of both caseinate and milk to higher values. A linear relation between this pH and the reciprocal dielectric constant of the mixture was observed. The addition of calcium to these alcoholic mixtures also increased the pH of minimum stability. The results are discussed in terms of the alcohol-induced shifts in the pK values of important constituent amino acids and of the effect of alcohol on soluble Ca levels.

Concerning the role of the reaction field in the proton shielding of molecules in solution

1967 ◽  
Vol 45 (10) ◽  
pp. 1093-1096 ◽  
Author(s):  
G. Kotowycz ◽  
T. Schaefer
Keyword(s):  
Dielectric Constant ◽  
Chemical Shift ◽  
Solute Molecule ◽  
Proton Chemical Shift ◽  
Square Root ◽  
Reaction Field ◽  
Strong Curvature

It is shown that the strong curvature in some plots of proton chemical shift σ versus the Onsager reaction field E can be removed by plotting the shifts of the solute molecule versus the square root of the dielectric constant of the medium. The resulting values of k in the equation σ = −kE cos θ are fairly consistent and reasonable in magnitude.

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