Aqueous two-phase microdroplets with reversible phase transitions

Lab on a Chip ◽  
2013 ◽  
Vol 13 (7) ◽  
pp. 1295 ◽  
Author(s):  
Jonathan B. Boreyko ◽  
Prachya Mruetusatorn ◽  
Scott T. Retterer ◽  
C. Patrick Collier
Keyword(s):  
Phase Transitions ◽  
Two Phase ◽  
Reversible Phase

A spiro-type ammonium based switchable dielectric material with two sequential reversible phase transitions above room temperature

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74117-74123 ◽  
Author(s):  
Xiao-Li Wang ◽  
Lin Zhou ◽  
Qiong Ye ◽  
Fu-Juan Geng ◽  
Heng-Yun Ye ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Room Temperature ◽  
Dielectric Material ◽  
Two Phase ◽  
Reversible Phase

A novel spiro-type hybrid undergoes two phase transitions at 336 and 357 K, accompanied by remarkable changes of H-bond interactions.

scholarly journals Two Reversible Phase Transitions in the Fluorophosphate (NH4)2PO3F·(NH4)NO3

2014 ◽  
Vol 70 (a1) ◽  
pp. C1030-C1030
Author(s):  
Matthias Weil ◽  
Thomas Häusler
Keyword(s):  
Hydrogen Bonding ◽  
Phase Transitions ◽  
Three Dimensional ◽  
Building Blocks ◽  
Minor Role ◽  
Two Phase ◽  
Space Group ◽  
Bonding System ◽  
Set Up ◽  
Reversible Phase

Fluorophosphates have multiple applications, e.g. as wood preservatives, as corrosion inhibitors or as toothpaste additives [1]. Fluorophosphates contain the tetrahedral anion PO3F2- that is characterized by three P-O bonds of similar length (ca. 1.51 Å) and one considerably longer P-F bond (ca. 1.60 Å). In the course of systematic crystal growth experiments of new fluorophosphates, we have isolated the double salt (NH4)2PO3F·(NH4)NO3. Temperature-dependent X-ray diffraction studies on polycrystalline and single-crystalline samples revealed two reversible phase transitions. The room-temperature polymorph I (space group P21/n) transforms at ca. 170 K into the intermediate polymorph II (space group P-1) that in turn transforms at ca. 140 K into the low-temperature polymorph III (space group P21/n). The driving force of the phase transitions I->II and II->III is a tilting of the nitrate groups within the structure relative to the other building blocks. The two phase transitions are accompanied by an increase of the unit cell volume on cooling. The three-dimensional structural set-up in the three polymorphs of (NH4)2PO3F·(NH4)NO3 is dominated by an intricate N-H...O hydrogen-bonding system between ammonium donor groups and nitrate and fluorophosphates acceptor groups. It is interesting to note that hydrogen-bonding of the type N-H...F plays a minor role.

Two-Phase Flow with Phase Transitions Instability

1997 ◽  
Vol 28 (4-6) ◽  
pp. 273-276
Author(s):  
B. V. Kichatov ◽  
I. V. Boyko
Keyword(s):  
Phase Transitions ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

On the nature of the phase transitions of aluminosilicate perrhenate sodalite

2020 ◽  
Vol 235 (6-7) ◽  
pp. 213-223
Author(s):  
Hilke Petersen ◽  
Lars Robben ◽  
Thorsten M. Gesing
Keyword(s):  
Raman Spectroscopy ◽  
Phase Transitions ◽  
Decomposition Temperature ◽  
Second Phase ◽  
Structure Property ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Two Phase ◽  
Structure Property Relationships ◽  
Heat Capacity Measurements

AbstractThe temperature-dependent structure-property relationships of the aluminosilicate perrhenate sodalite |Na8(ReO4)2|[AlSiO4]6 (ReO4-SOD) were analysed via powder X-ray diffraction (PXRD), Raman spectroscopy and heat capacity measurements. ReO4-SOD shows two phase transitions in the investigated temperature range (13 K < T < 1480 K). The first one at 218.6(1) K is correlated to the transition of dynamically ordered $P\overline{4}3n$ (> 218.6(1 K) to a statically disordered (<218.6(1) K) SOD template in $P\overline{4}3n$. The loss of the dynamics of the template anion during cooling causes an increase of disorder, indicated by an unusual intensity decrease of the 011-reflection and an increase of the Re-O2 bond length with decreasing temperature. Additionally, Raman spectroscopy shows a distortion of the ReO4 anion. Upon heating the thermal expansion of the sodalite cage originated in the tilt-mechanism causes the second phase transition at 442(1) K resulting in a symmetry-increase from $P\overline{4}3n$ to $Pm\overline{3}n$, the structure with the sodalites full framework expansion. Noteworthy is the high decomposition temperature of 1320(10) K.

Using μ2rheology to quantify rheological properties during repeated reversible phase transitions of soft matter

Lab on a Chip ◽  
2017 ◽  
Vol 17 (12) ◽  
pp. 2085-2094 ◽  
Author(s):  
Matthew D. Wehrman ◽  
Melissa J. Milstrey ◽  
Seth Lindberg ◽  
Kelly M. Schultz
Keyword(s):  
Phase Transitions ◽  
Rheological Properties ◽  
Soft Matter ◽  
Single Sample ◽  
Fluid Exchange ◽  
Reversible Phase ◽  
Surrounding Fluid

A novel microfluidic design enables repeated phase transitions in a single sample by surrounding fluid exchange and microrheological characterization.

scholarly journals Strain glass state as the boundary of two phase transitions

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Zhijian Zhou ◽  
Jian Cui ◽  
Xiaobing Ren
Keyword(s):  
Phase Transitions ◽  
Two Phase ◽  
Glass State

Structural and compositional reversible phase transitions on low-index Fe 3 Si surfaces

2001 ◽  
Vol 56 (6) ◽  
pp. 822-828 ◽  
Author(s):  
U Starke ◽  
J Schardt ◽  
W Weiss ◽  
W Meier ◽  
C Polop ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Reversible Phase
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