Effect of Drug–Polymer Interactions through Hypromellose Acetate Succinate Substituents on the Physical Stability on Solid Dispersions Studied by Fourier-Transform Infrared and Solid-State Nuclear Magnetic Resonance

2019 ◽  
Vol 16 (6) ◽  
pp. 2785-2794 ◽  
Author(s):  
Yuya Ishizuka ◽  
Keisuke Ueda ◽  
Hitomi Okada ◽  
Junpei Takeda ◽  
Masatoshi Karashima ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Solid State ◽  
Magnetic Resonance ◽  
Solid Dispersions ◽  
Physical Stability ◽  
Fourier Transform Infrared ◽  
Polymer Interactions ◽  
Hypromellose Acetate Succinate ◽  
Nuclear Magnetic

SOLID-STATE FOURIER TRANSFORM INFRARED AND 31P NUCLEAR MAGNETIC RESONANCE SPECTRAL FEATURES OF PHOSPHATE COMPOUNDS

Soil Science ◽  
2007 ◽  
Vol 172 (7) ◽  
pp. 501-515 ◽  
Author(s):  
Zhongqi He ◽  
C. Wayne Honeycutt ◽  
Baoshan Xing ◽  
Richard W. McDowell ◽  
Perry J. Pellechia ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Solid State ◽  
Magnetic Resonance ◽  
Fourier Transform Infrared ◽  
Spectral Features ◽  
31P Nuclear Magnetic Resonance ◽  
Phosphate Compounds ◽  
Nuclear Magnetic

Formation Mechanism and its Pozzolanic Activity of Metakaolin

2014 ◽  
Vol 602-603 ◽  
pp. 620-623 ◽  
Author(s):  
Mei Rong Wang ◽  
Ning Guo ◽  
Pei Gang He ◽  
Jing Bo Yu ◽  
De Chang Jia
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Solid State ◽  
Magnetic Resonance ◽  
Formation Mechanism ◽  
Infrared Spectra ◽  
Fourier Transform Infrared ◽  
Pozzolanic Activity ◽  
Different Temperatures ◽  
Increasing Temperature

In this paper, the process of the transformation from kaolin to metakaolin was investigated. The kaolin was calcined at different temperatures and analyzed by Xray diffraction (XRD), Fourier transform infrared spectra (FTIR) and solid state nuclear magnetic resonance (NMR). The formation of metakaolin structure was based on the stacking polyhedrons changes, which originated from dehydroxylation of kaolinite. With increasing temperature, kaolin kept structure of kaolinite unchanged in the course of dehydroxylation and then structure of kaolinite transformed to metakaolin when the dehydroxylation was over. It was demonstrated that the essence of pozzolanic activity of metakaolin. The result revealed that the pozzolanic activity of metakaolin increased with increasing temperature at the range of 600~900 °C.

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