Infra-red spectroscopic studies of the bending modes of water. Detection of 1:1 and 1:2 complexes in organic solutions

1974 ◽  
Vol 70 ◽  
pp. 1191 ◽  
Author(s):  
Emilie Gentric ◽  
Anne le Narvor ◽  
Pierre Saumagne
Keyword(s):  
Spectroscopic Studies ◽  
Water Detection ◽  
Infra Red ◽  
Bending Modes ◽  
Organic Solutions

Spectroscopic Studies of a Superionic Plastic Phase Crystal: Lithium Sulfate

1988 ◽  
Vol 135 ◽  
Author(s):  
Roger Frech
Keyword(s):  
Lithium Ion ◽  
Spectroscopic Studies ◽  
Lithium Sulfate ◽  
Sulfate Ion ◽  
Raman Spectroscopic ◽  
Ion Interactions ◽  
Energy Environment ◽  
Plastic Phase ◽  
Bending Modes ◽  
Increasing Temperature

AbstractTemperature dependent Raman spectroscopic studies of single crystal lithium sulfate are summarized. Coupling between sulfate ion bending modes and the lithium ion translatory modes becomes weaker with increasing temperature until the lithium modes can no longer be observed above 250° C. The temperature interval above 450° in the monoclinic phase is marked by the onset of significant sulfate ion reorientational motion, as evidenced by the bandshape studies of the sulfate ion v1, mode and the librational modes. Bandshape analysis of the v3mode in the plastic phase strongly suggests that the symmetry of the sulfate ion potential energy environment has planar anisotropy.The lithium ion-sulfate ion interactions are modeled for correlated sulfate ion configurations as a function of lithium ion position. The results support the role of the octahedral site in lithium ion transitions contributing to the ionic conductivity.

Cure Characteristics and Spectroscopic Studies of Silica Filled Epoxidised Natural Rubber Compound

2013 ◽  
Vol 844 ◽  
pp. 225-228
Author(s):  
Mazlina Mustapha Kamal ◽  
Rohani Abu Bakar
Keyword(s):  
Fourier Transform ◽  
Natural Rubber ◽  
Chemical Interaction ◽  
Spectroscopic Studies ◽  
The Other ◽  
Rubber Compound ◽  
Precipitated Silica ◽  
Profound Influence ◽  
Polymer Filler ◽  
Infra Red

Reinforcement of rubber by precipitated silica is adversely affected due to lack of strong polymer filler bonding1-2. The surface energy of fillers play an important role in the reinforcement of rubbers and has a profound influence on the performance of rubber products3. Functionalised polymers interact strongly with surface silanol groups of precipitated silica. In this work, the unique reinforcement mechanism exhibited by silica in Epoxidised Natural Rubber (ENR) is established through rheometric and Fourier Transform Infrared Spectroscopic (FTIR) study. A rheometer torque rise was detected with an ENR compound silica in the absence of any curing agent. On the other hand, the extent of the interaction increased with the increment of epoxidation level. Fourier transform infra red spectroscopic studies showed silica is bonded to ENR through formation of Si-O-C bond and the extent of the chemical interaction depends on the moulding time4.

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