Stimuli-responsive poly(N-isopropylacrylamide). Photo- and chemical-induced phase transitions

2005 ◽  
pp. 49-65 ◽  
Author(s):  
Masahiro Irie
Keyword(s):  
Phase Transitions ◽  
Stimuli Responsive

scholarly journals Single-crystal-to-single-crystal transformations triggered by dehydration in polyoxometalate-based compounds

2018 ◽  
Vol 74 (11) ◽  
pp. 1222-1242 ◽  
Author(s):  
Santiago Reinoso ◽  
Beñat Artetxe ◽  
Juan M. Gutiérrez-Zorrilla
Keyword(s):  
Phase Transitions ◽  
Single Crystal ◽  
Crystal Engineering ◽  
Structural Response ◽  
Transformation Process ◽  
External Stimulus ◽  
Stimuli Responsive ◽  
Feature Article ◽  
Crystal Transformation ◽  
Solvent Molecules

Single-crystal-to-single-crystal transformations are solid-state phase transitions between different crystalline states in which the crystal integrity and the long-range structural order are retained through the whole transformation process. Such a phenomenon constitutes the structural response that some compounds afford when being exposed to a given external stimulus (temperature, pressure, light, etc.) and, therefore, its study has become a relevant focus of interest within crystal engineering because it allows for monitoring how certain properties (colour, magnetism, luminescence, porosity) of the stimuli-responsive material are modified as the structure evolves into the activated form. A range of organic, inorganic and hybrid systems have been found to undergo such phase transitions, but these examples only include a small number of compounds that incorporate polyoxometalate anions, among which the removal of guest solvent molecules (dehydration) stands out as the most common external stimulus able to induce the occurrence of a single-crystal-to-single-crystal transformation. This feature article compiles the examples of dehydration-triggered single-crystal-to-single-crystal transformation studies that have been reported to date for polyoxometalate-based compounds and reviews some of their most relevant structural aspects.

Physical stimuli-responsive liposomes and polymersomes as drug delivery vehicles based on phase transitions in the membrane

Nanoscale ◽  
2018 ◽  
Vol 10 (15) ◽  
pp. 6781-6800 ◽  
Author(s):  
Yangwei Deng ◽  
Jun Ling ◽  
Min-Hui Li
Keyword(s):  
Drug Delivery ◽  
Phase Transitions ◽  
Drug Release ◽  
Liquid Crystalline ◽  
Stimuli Responsive ◽  
Physical Stimulation ◽  
Drug Delivery Vehicles ◽  
Liquid Crystalline Phases ◽  
Physical Stimuli ◽  
Delivery Vehicles

Crystalline and liquid crystalline phases in the membrane lead to intriguing morphologies of vesicles for drug release upon physical stimulation.

Stimuli-responsive microgels with cationic moieties: characterization and interaction with E. coli cells

Soft Matter ◽  
2021 ◽  
Author(s):  
Larissa Hussmann ◽  
Thomke Belthle ◽  
Dan E. Demco ◽  
Radu Fechete ◽  
Andrij Pich
Keyword(s):  
Phase Transitions ◽  
Functional Group ◽  
Stimuli Responsive ◽  
E Coli ◽  
Volume Phase ◽  
Positively Charged

Poly-N-vinylcaprolactam based microgels with positively charged 1-vinyl-3-methylimidazolium were analyzed by functional group volume phase transitions and morphology. The microgels are antibacterial, due to positive charges in the microgel corona.

Phase transitions and photoluminescence switching in hybrid antimony(iii) and bismuth(iii) halides

CrystEngComm ◽  
2020 ◽  
Vol 22 (20) ◽  
pp. 3395-3405 ◽  
Author(s):  
Nannan Shen ◽  
Zeping Wang ◽  
Jiance Jin ◽  
Liaokuo Gong ◽  
Zhizhuan Zhang ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Stimuli Responsive ◽  
Organic Hybrid

In this review, the stimuli-responsive phase transitions and photoluminescence switching in inorganic–organic hybrid antimony(iii)/bismuth(iii) halides were summarized.

scholarly journals Continuous fabrication of multi-stimuli responsive graphene oxide composite hydrogel fibres by microfluidics

RSC Advances ◽  
2017 ◽  
Vol 7 (31) ◽  
pp. 19243-19249 ◽  
Author(s):  
Li Peng ◽  
Yan Liu ◽  
Jinghua Gong ◽  
Kaihuan Zhang ◽  
Jinghong Ma
Keyword(s):  
Graphene Oxide ◽  
Phase Transitions ◽  
Composite Hydrogel ◽  
Stimuli Responsive ◽  
Oxide Composite ◽  
Volume Phase ◽  
Spinning Process ◽  
Continuous Fabrication

Stimuli responsive graphene oxide composite hydrogel fibres were preparedviaa microfluidic spinning process, and exhibit both thermo-triggered volume-phase transitions and electrically triggered bending behaviours.

Crystal structure of a 1,6-bis(phenylethynyl)pyrene-based cyclophane that exhibits mechanochromic luminescence

2021 ◽  
Author(s):  
Shohei Simizu ◽  
Shakkeeb Thazhathethil ◽  
Kiyonori Takahashi ◽  
Takayoshi Nakamura ◽  
Yoshimitsu Sagara
Keyword(s):  
Crystal Structure ◽  
Phase Transitions ◽  
Amorphous Phase ◽  
Photophysical Properties ◽  
Luminescent Materials ◽  
Mechanical Stimuli ◽  
Stimuli Responsive ◽  
Mechanochromic Luminescence

Cyclophanes featuring luminophores are considered promising candidates as thermal or mechanical stimuli-responsive luminescent materials. The mechanism of the changes in the photophysical properties on the crystal-crystal or crystal-amorphous phase transitions...

scholarly journals Dual stimuli-responsive oligo(ethylene glycol)-based microgels: insight into the role of internal structure in volume phase transitions and loading of magnetic nanoparticles to design stable thermoresponsive hybrid microgels

2016 ◽  
Vol 7 (2) ◽  
pp. 350-363 ◽  
Author(s):  
Mohamed Boularas ◽  
Elise Deniau-Lejeune ◽  
Valérie Alard ◽  
Jean-François Tranchant ◽  
Laurent Billon ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Magnetic Nanoparticles ◽  
Ethylene Glycol ◽  
Internal Structure ◽  
Stimuli Responsive ◽  
Volume Phase ◽  
Insight Into ◽  
Hybrid Microgels

Design of multi-responsive biocompatible P(MEO2MA-co-OEGMA-co-MAA) microgels and their hybrid magnetic couterparts.

Electron Microscopy of Graphite Intercalation Compounds

1982 ◽  
Vol 40 ◽  
pp. 544-545
Author(s):  
G. Timp ◽  
L. Salamanca-Riba ◽  
L.W. Hobbs ◽  
G. Dresselhaus ◽  
M.S. Dresselhaus
Keyword(s):  
Electron Microscopy ◽  
Phase Transitions ◽  
Domain Wall ◽  
Intercalation Compounds ◽  
Lattice Plane ◽  
Wall Model ◽  
Graphite Intercalation Compounds ◽  
Fundamental Symmetry ◽  
Graphite Intercalation

Electron microscopy can be used to study structures and phase transitions occurring in graphite intercalations compounds. The fundamental symmetry in graphite intercalation compounds is the staging periodicity whereby each intercalate layer is separated by n graphite layers, n denoting the stage index. The currently accepted model for intercalation proposed by Herold and Daumas assumes that the sample contains equal amounts of intercalant between any two graphite layers and staged regions are confined to domains. Specifically, in a stage 2 compound, the Herold-Daumas domain wall model predicts a pleated lattice plane structure.

Multiple phase transitions investigated by high-speed TEM

1990 ◽  
Vol 48 (4) ◽  
pp. 550-551
Author(s):  
Oleg Bostanjoglo ◽  
Peter Thomsen-Schmidt
Keyword(s):  
Phase Transitions ◽  
High Speed ◽  
Short Exposure ◽  
Semiconductor Film ◽  
Time Resolved ◽  
Short Exposure Time ◽  
Multiple Phase ◽  
Model Substance ◽  
History Of ◽  
Electron Image

Thin GexTe1-x (x = 0.15-0.8) were studied as a model substance of a composite semiconductor film, in addition being of interest for optical storage material. Two complementary modes of time-resolved TEM were used to trace the phase transitions, induced by an attached Q-switched (50 ns FWHM) and frequency doubled (532 nm) Nd:YAG laser. The laser radiation was focused onto the specimen within the TEM to a 20 μm spot (FWHM). Discrete intermediate states were visualized by short-exposure time doubleframe imaging /1,2/. The full history of a transformation was gained by tracking the electron image intensity with photomultiplier and storage oscilloscopes (space/time resolution 100 nm/3 ns) /3/. In order to avoid radiation damage by the probing electron beam to detector and specimen, the beam is pulsed in this continuous mode of time-resolved TEM,too.Short events ( <2 μs) are followed by illuminating with an extended single electron pulse (fig. 1c)

Amino-functional polyethers: versatile, stimuli-responsive polymers

2020 ◽  
Vol 11 (24) ◽  
pp. 3940-3950 ◽  
Author(s):  
Patrick Verkoyen ◽  
Holger Frey
Keyword(s):  
Ring Opening ◽  
Review Article ◽  
Stimuli Responsive ◽  
New Class ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers

Amino-functional polyethers have emerged as a new class of “smart”, i.e. pH- and thermoresponsive materials. This review article summarizes the synthesis and applications of these materials, obtained from ring-opening of suitable epoxide monomers.

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