Structure and Thermal Analyses of MAA-Grafted Silk Fiber Using DSC and13C Solid-State NMR

2006 ◽  
Vol 291 (7) ◽  
pp. 877-882 ◽  
Author(s):  
Tsunenori Kameda ◽  
Masuhiro Tsukada
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Thermal Analyses ◽  
Silk Fiber

Preparation of the Novel Nanocomposite Biurea/Montmorillonite via In Situ Synthesis

2012 ◽  
Vol 486 ◽  
pp. 388-393 ◽  
Author(s):  
Juan Xu ◽  
Li Li Jing ◽  
Can Xiong Guo
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Chemical Shifts ◽  
Thermal Analyses ◽  
Interlayer Spacing ◽  
Synthesis Process ◽  
Basal Spacing ◽  
The Novel ◽  
New Phase

Using the urea intercalated montmorillonite (Urea/MMT) as the precursor, a novel nanocomposite biurea intercalated montmorillonite (Biurea/MMT) was prepared via the in-situ synthesis process through the introduction of hydrazine hydrate (HY). The resulted nanocomposites were characterized by using techniques such as XRD, FTIR, solid state NMR as well as thermal analyses, etc. The influence of the concentration of the HY on the products was also investigated. The XRD results showed the variation of the interlayer spacing of MMT from 1.51 nm to 1.71 nm for Urea/MMT. When the concentration of HY was low, the substitution of urea by HY was taken place which resulted in the decrease of the interlayer distance to 1.27nm. When the concentration increased to greater than 40%, the new phase with basal spacing of 1.75 nm was dominated. It indicated that a novel nanocomposite was synthesized in-situ. The solid state NMR results confirmed the in-situ formation of Biurea/MMT in which the chemical shifts of13C and15N of the intercalated biurea were slightly different from the bulk biurea. The intercalated biurea decomposed easily than those bulk powders due to the highly dispersion in the interlayer space of MMT.

New copper(II) complexes of polyampholyte and polyelectrolyte polymers: Solid-state NMR, FTIR, XRPD and thermal analyses

Polymer ◽  
2008 ◽  
Vol 49 (25) ◽  
pp. 5482-5489 ◽  
Author(s):  
Juan Manuel Lázaro Martínez ◽  
Ana Karina Chattah ◽  
Gustavo Alberto Monti ◽  
María Florencia Leal Denis ◽  
Graciela Yolanda Buldain ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Thermal Analyses

scholarly journals Solid-State NMR Comparison of Various Spiders’ Dragline Silk Fiber

2010 ◽  
Vol 11 (8) ◽  
pp. 2039-2043 ◽  
Author(s):  
Melinda S. Creager ◽  
Janelle E. Jenkins ◽  
Leigh A. Thagard-Yeaman ◽  
Amanda E. Brooks ◽  
Justin A. Jones ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Silk Fiber ◽  
Dragline Silk

Preparation of Delaminated Nano-Kaolinite by Intercalation of Chemical Assistants

2006 ◽  
Vol 11-12 ◽  
pp. 441-444 ◽  
Author(s):  
Mei Na Niu ◽  
Can Xiong Guo
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Solid State Nmr ◽  
Thermal Analyses ◽  
Potassium Acetate

A process for preparing of the delaminated kaolinite was developed with intercalation of hydrazine, urea or potassium acetate followed by removing the chemical assistants. Delaminated kaolinite was characterized by XRD, solid-state NMR, thermal analyses, particle-size distribution analyses, etc. The particle size was reduced to ca. 440 nm in diameter and ca.15 nm in thickness in contrast to about 7 μm and 800 nm for untreated precursor respectively. The dehydroxylation temperature of kaolinite was shifted from 514°C to 490°C by the delamination. Additionally, a greater mass lost was also observed for the delaminated particles by dehydroxylation.

A useful tool for the elaboration of new solid-state NMR experiments: PULSAR

1995 ◽  
Vol 92 ◽  
pp. 1939-1942 ◽  
Author(s):  
JP Amoureux ◽  
C Fernandez ◽  
Y Dumazy
Keyword(s):  
Solid State ◽  
Solid State Nmr
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