scholarly journals NIR-Triggered Crystal Phase Transformation of NiTi-Layered Double Hydroxides Films for Localized Chemothermal Tumor Therapy

2018 ◽  
Vol 5 (4) ◽  
pp. 1700782 ◽  
Author(s):  
Donghui Wang ◽  
Naijian Ge ◽  
Tingting Yang ◽  
Feng Peng ◽  
Yuqin Qiao ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Layered Double Hydroxides ◽  
Tumor Therapy ◽  
Crystal Phase ◽  
Double Hydroxides ◽  
Crystal Phase Transformation

Reversible Luminescent Switching in an Organic Cocrystal: Multi‐Stimuli‐Induced Crystal‐to‐Crystal Phase Transformation

2020 ◽  
Vol 59 (35) ◽  
pp. 15098-15103 ◽  
Author(s):  
Yingjie Liu ◽  
Aisen Li ◽  
Shuping Xu ◽  
Weiqing Xu ◽  
Yu Liu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Crystal Phase ◽  
Crystal Phase Transformation

Crystal phase transformation and doping-induced blue emission of Eu-doped InOOH and cubic/corundum-type rhombohedral In2O3nanowires

CrystEngComm ◽  
2015 ◽  
Vol 17 (5) ◽  
pp. 1189-1200 ◽  
Author(s):  
Won Joo Kim ◽  
Bong-Ki Min ◽  
Debabrata Pradhan ◽  
Youngku Sohn
Keyword(s):  
Phase Transformation ◽  
Blue Emission ◽  
Crystal Phase ◽  
Crystal Phase Transformation

Structural and microstructural changes during anion exchange of CoAl layered double hydroxides: anin situX-ray powder diffraction study

2010 ◽  
Vol 43 (3) ◽  
pp. 434-447 ◽  
Author(s):  
Rune E. Johnsen ◽  
Frank Krumeich ◽  
Poul Norby
Keyword(s):  
Phase Transformation ◽  
Exchange Reaction ◽  
Anion Exchange ◽  
Powder Diffraction ◽  
Layered Double Hydroxides ◽  
Two Phase ◽  
X Ray ◽  
Double Hydroxides ◽  
Anion Exchange Reaction

Anion-exchange processes in cobalt–aluminium layered double hydroxides (LDHs) were studied byin situsynchrotron X-ray powder diffraction (XRPD). The processes investigated were CoAl–CO3→ CoAl–Cl → CoAl–CO3, CoAl–Cl → CoAl–NO3and CoAl–CO3→ CoAl–SO4. The XRPD data show that the CoAl–CO3→ CoAl–Cl process is a two-phase transformation, where the amount of the CoAl–CO3phase decreases exponentially while that of the CoAl–Cl phase increases exponentially. Energy-dispersive X-ray spectroscopy (EDXS) studies of a partially chloride-exchanged CoAl–CO3LDH sample along within situXRPD data suggested that the individual particles in the CoAl–CO3sample are generally anion-exchanged with chloride one at a time. In contrast with the CoAl–CO3→ CoAl–Cl transformation, the XRPD data show that the reverse CoAl–Cl → CoAl–CO3process is a one-phase transformation. Rietveld refinements indicate that the occupancy factors of the carbon and oxygen sites of the carbonate group increase, while that of the chloride site decreases. In the CoAl–Cl → CoAl–NO3anion-exchange reaction, the XRPD patterns reveal the existence of two intermediate phases in addition to the initial CoAl–Cl and final CoAl–NO3phases. Thein situdata indicate that one of these intermediates is a mixed nitrate- and chloride-based LDH phase, where the disorder decreases as the nitrate content increases. The XRPD data of the partial CoAl–CO3→ CoAl–SO4anion-exchange reaction show that the process is a two-phase transformation involving a sulfate-containing LDH with a 1H polytype structure.

Partial rotation of the isopropyl group in the solid state: single-crystal-to-single-crystal phase transformation in a carvacrol derivative

CrystEngComm ◽  
2015 ◽  
Vol 17 (39) ◽  
pp. 7482-7485 ◽  
Author(s):  
Umesh D. Pete ◽  
Amol G. Dikundwar ◽  
Vaishali M. Sharma ◽  
Shridhar P. Gejji ◽  
Ratnamala S. Bendre ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Single Crystal ◽  
Crystal Phase ◽  
Thermal Stimulus ◽  
Isopropyl Group ◽  
Group Rotation ◽  
Crystal Phase Transformation

Isopropyl group rotation observed in a single crystal of TACH appears to be a result of the counterbalance of molecular energetics and supramolecular packing in response to the thermal stimulus.

A new polymorph of ortho-ethoxy-trans-cinnamic acid: single-to-single-crystal phase transformation and mechanism

2004 ◽  
Vol 60 (3) ◽  
pp. 300-314 ◽  
Author(s):  
Manuel A. Fernandes ◽  
Demetrius C. Levendis ◽  
F. R. Ludwig Schoening
Keyword(s):  
Phase Transition ◽  
Phase Transformation ◽  
Single Crystal ◽  
Cinnamic Acid ◽  
Crystal Phase ◽  
Conformational Transformation ◽  
Cinnamic Acid Derivative ◽  
Two Temperatures ◽  
High Temperature Polymorph ◽  
Crystal Phase Transformation

The α-polymorph of ortho-ethoxy-trans-cinnamic acid (OETCA) undergoes a reversible single-crystal-to-single-crystal phase transformation at 333 K. The new high-temperature polymorph (α′-OETCA) is stable between 333 and 393 K with three molecules in the asymmetric unit (Z′ = 3), space group P\bar 1. Unlike the other polymorphs (and solvate) of OETCA recently reported, two of the molecules in α′-OETCA deviate significantly from planarity. This conformational change results in the corrugated sheet-type structure of α′-OETCA. The sheets are made up of ribbons, each composed of R_2 ^2 (8) hydrogen-bonded pairs (via the —COOH groups), which are further connected by CH...O interactions. When exposed to UV radiation the α′-OETCA polymorph can be stabilized below 333 K with ca 8% of the monomer converted into the photodimer. The crystal structures of α′-OETCA are reported at two temperatures above the phase transition point (at 345 and 375 K) as well as the stabilized forms at 173 and 293 K. A mechanism for the phase transition involving a cooperative conformational transformation coupled with a shift of layers of OETCA molecules is proposed. The α′-OETCA polymorph is also an example of a cinnamic acid derivative where two different potentially photoreactive environments exist in one crystal in which each unit cell has two non-centrosymmetric predimer sites and one centrosymmetric predimer site.

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