High-Resolution Cryogenic-Electron Microscopy Reveals Details of a Hexagonal-to-Bicontinuous Cubic Phase Transition in Mesoporous Silica Synthesis

2009 ◽  
Vol 131 (34) ◽  
pp. 12466-12473 ◽  
Author(s):  
Liora Omer ◽  
Sharon Ruthstein ◽  
Daniella Goldfarb ◽  
Yeshayahu Talmon
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
High Resolution ◽  
Mesoporous Silica ◽  
Cubic Phase ◽  
Bicontinuous Cubic ◽  
Silica Synthesis

Surfactant chain length effect on the hexagonal-to-cubic phase transition in mesoporous silica synthesis

2012 ◽  
Vol 147 (1) ◽  
pp. 242-251 ◽  
Author(s):  
Changchang Liu ◽  
Xiaoming Wang ◽  
Sungchul Lee ◽  
Lisa D. Pfefferle ◽  
Gary L. Haller
Keyword(s):  
Phase Transition ◽  
Mesoporous Silica ◽  
Chain Length ◽  
Cubic Phase ◽  
Length Effect ◽  
Silica Synthesis

scholarly journals Morphological Characterization of Ordered Meso-Pores on a Mesoporous Silica by using High-Resolution Scanning Electron Microscopy

2011 ◽  
Vol 17 (S2) ◽  
pp. 1912-1913
Author(s):  
Y Ohrai ◽  
T Sunaoshi ◽  
H Ito ◽  
T Ogashiwa ◽  
N Ikawa ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Mesoporous Silica ◽  
Morphological Characterization ◽  
Scanning Electron

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

scholarly journals Structural studies of the lamellar to bicontinuous gyroid cubic (QGII) phase transitions under limited hydration conditions

Soft Matter ◽  
2015 ◽  
Vol 11 (10) ◽  
pp. 1991-1997 ◽  
Author(s):  
T.-Y. Dora Tang ◽  
Nicholas J. Brooks ◽  
Oscar Ces ◽  
John M. Seddon ◽  
Richard H. Templer
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Elastic Energy ◽  
Cubic Phase ◽  
Structural Studies ◽  
Present Evidence ◽  
Bicontinuous Cubic

We present evidence for a non-diffracting structural intermediate during the lamellar to inverse bicontinuous cubic phase transition and show that elastic energy drives the cubic phase to equilibrium.

Kinetics and Mechanism of the Lamellar to Gyroid Inverse Bicontinuous Cubic Phase Transition

Langmuir ◽  
2002 ◽  
Vol 18 (20) ◽  
pp. 7384-7392 ◽  
Author(s):  
Adam M. Squires ◽  
R. H. Templer ◽  
J. M. Seddon ◽  
J. Woenckhaus ◽  
R. Winter ◽  
...  
Keyword(s):  
Phase Transition ◽  
Kinetics And Mechanism ◽  
Cubic Phase ◽  
Bicontinuous Cubic

Electron microscopy of the commensurate-incommensurate phase transition with the discommensuration network in 1T-TaS2

1990 ◽  
Vol 48 (4) ◽  
pp. 168-169
Author(s):  
Takashi Ishiguro ◽  
Hiroshi Sato
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Transmission Electron Microscopy ◽  
Phase Transitions ◽  
High Resolution ◽  
Low Temperature ◽  
Transmission Electron ◽  
Continuous Rotation ◽  
T Phase ◽  
New Phase

Phase transitions of lT-TaS2 both on cooling from the incommensurate (IC) phase and on heating from the commensurate (C) phase are investigated by high resolution (HR) transmission electron microscopy because phase transitions are strongly hysteretic. The phases which had been identified were Normal(T>543K,no modurated wave, the Cdl2 type of structure, ao=0.336nm co=0.590nm), IC(354K< T< 543K), NC(non-commensurate or nearly commensurate, 185K<T<353K) and C(T<K). On heating from the C phase, the new phase called the T phase (nearly commensurate triclinic ) appears between 200K and 280K, and that has the discommensuration (DC) network. The HR observations at low temperature reveal both the three dimentional structure of the C phase and the DC network structure of the T phase.On cooling from the IC phase, the structure of the NC phase is essentially incommensurate in the basal plane and a continuous rotation of the moduration direction towards the C phase occurs.

HREM study of ferroelectric domain wall in barium titanate

1994 ◽  
Vol 52 ◽  
pp. 566-567
Author(s):  
Laurent. Normand ◽  
Alain. Thorel ◽  
Yvan. Montardi
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Barium Titanate ◽  
Domain Walls ◽  
Ferroelectric Phase ◽  
Ferroelectric Domain ◽  
Transmission Electron ◽  
The One

This study focuses on High Resolution Transmission Electron Microscopy of barium titanate in its tetragonal ferroelectric phase, and especially on the structure of domain walls. This phase is stable between about 0 °C and 130 °C. During cooling, at 130 °C barium titanate changes from a cubic parraelectric phase to a tetragonal ferroelectric phase. In this phase the spontaneous polarisation is along one of the six [001] pseudo-cubic directions. Two types of domains can be formed during the phase transition :90° and 180° domains. In 90° domains the polarisation is at 90° from the polarisation of the next domain (exactly 2* ArcTan(a/c) if a and c are the lattice parameters). For these domains the domain walls are <110< type planes ; In 180° domains the polarisation is at 180° from the one in the next domain. 180° domain walls are <100< type plane and are assumed to be purely ferroelectric.

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