Temperature-Driven and Reversible Assembly of Homopolyelectrolytes Derived from Suitably Designed Ionic Liquids in Water

2013 ◽  
Vol 66 (11) ◽  
pp. 1393 ◽  
Author(s):  
Yuki Kohno ◽  
Yuki Deguchi ◽  
Naomi Inoue ◽  
Hiroyuki Ohno
Keyword(s):  
Ionic Liquids ◽  
Phase Change ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Temperature Sensitive ◽  
Spherical Nanoparticles ◽  
Critical Solution Temperature ◽  
Type Phase ◽  
Diameter Change

Polycationic-type homopolymers derived from polymerisable ionic liquids with adequate hydrophobicity were prepared to form spherical nanoparticles in water that changed their diameter as a function of temperature. The diameter change was attributed to a temperature-sensitive and reversible lower critical solution temperature-type phase change of the polymers in water.

Key Factors to Prepare Polyelectrolytes Showing Temperature-Sensitive Lower Critical Solution Temperature-type Phase Transitions in Water

2012 ◽  
Vol 65 (1) ◽  
pp. 91 ◽  
Author(s):  
Yuki Kohno ◽  
Hiroyuki Ohno
Keyword(s):  
Phase Transition ◽  
Lower Critical Solution Temperature ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Phase Behaviour ◽  
Solution Temperature ◽  
Temperature Sensitive ◽  
Key Factors ◽  
Critical Solution Temperature ◽  
Type Phase

Tetrabutylphosphonium styrenesulfonate and its homopolymer showed a lower critical solution temperature-type phase transition in water. As the hydrophobicity of these monomeric and polymeric salts affects phase behaviour, the phase transition temperature of the polyelectrolyte was changed by the introduction of monomers having different alkyl chain length on the phosphonium cations.

Material design of ionic liquids to show temperature-sensitive LCST-type phase transition after mixing with water

2011 ◽  
Vol 64 (12) ◽  
pp. 1560 ◽  
Author(s):  
Yuki Kohno ◽  
Hiroki Arai ◽  
Shohei Saita ◽  
Hiroyuki Ohno
Keyword(s):  
Phase Transition ◽  
Ionic Liquids ◽  
Material Design ◽  
Phase Behaviour ◽  
Solution Temperature ◽  
Temperature Sensitive ◽  
Critical Solution Temperature ◽  
Alkyl Chains ◽  
Type Phase ◽  
Separation Temperature

Phosphonium cations bearing different alkyl chains were coupled with several common anions so as to prepare ionic liquids (ILs) with diverse hydrophobicity. A temperature-driven phase behaviour of the mixture of various ILs and water has been examined. A few ILs were found to exhibit temperature-sensitive lower critical solution temperature (LCST)-type phase transition after mixing with water. The phase separation temperature (Tc) of the IL/water mixtures depended strongly on the hydrophobicity of the component ions as well as mixing ratio. The number of water molecules per ion pair in the IL phase (mwater) increased dramatically upon cooling. The temperature dependence of this parameter was found to be useful to predict the possibility of the ILs to show the LCST-type phase behaviour after mixing with water. Since the value of mwater depended on the ion structure, especially on the hydrophobicity, the Tc was accurately set out by suitably mixing two ILs with different hydrophobicity.

A polyelectrolyte-containing copolymer with a gas-switchable lower critical solution temperature-type phase transition

2019 ◽  
Vol 10 (2) ◽  
pp. 260-266 ◽  
Author(s):  
Jin-Jin Li ◽  
Yin-Ning Zhou ◽  
Zheng-Hong Luo ◽  
Shiping Zhu
Keyword(s):  
Phase Transition ◽  
Cloud Point ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Type Phase

A polyelectrolyte-containing copolymer with a CO2/N2-switchable cloud point, resulting from the gas-induced alternation of hydrophilicity, was prepared.

scholarly journals Unexpected LCST-type phase behaviour of a poly(vinyl thiazolium) polymer in acetone

RSC Advances ◽  
2016 ◽  
Vol 6 (62) ◽  
pp. 57117-57121 ◽  
Author(s):  
Konrad Grygiel ◽  
Weiyi Zhang ◽  
Christophe Detrembleur ◽  
Jiayin Yuan
Keyword(s):  
Phase Transition ◽  
Lower Critical Solution Temperature ◽  
Acetone Solution ◽  
Phase Behaviour ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Type Phase

A poly(vinyl thiazolium) polymer in acetone solution exhibited an unexpected lower critical solution temperature (LCST)-type phase transition.

THERMOSENSITIVE NANOPARTICLES CONJUGATING WITH CD34 ANTIBODY AND ITS SOLUTION PEROPERTIES

2006 ◽  
Vol 18 (05) ◽  
pp. 222-228 ◽  
Author(s):  
CHUN-TE TAO ◽  
TAI-HORNG YOUNG
Keyword(s):  
Controlled Release ◽  
Cloud Point ◽  
Lower Critical Solution Temperature ◽  
Homogeneous Solution ◽  
The Body ◽  
Solution Temperature ◽  
Temperature Sensitive ◽  
Critical Solution Temperature ◽  
Human Cd34 ◽  
Collapse Temperature

Poly N-isopropylacrylamide (PNIPAAm) is a well-known temperature-sensitive polymer. When the temperature is higher than the lower critical solution temperature (LCST), PNIPAAm aquous solution is cloudy (phase separation occurred). In contrast, when the temperature is lower than the LCST, PNIPAAm is soluble in water (a homogeneous solution). The lower critical solution temperature (LCST) in aqueous solution of PNIPAAm was about 32~33°C. We prepared nano-scaled PNIPAAm particles containing carboxylic group on their surfaces by introducing acrylic acid monomer. The carboxylic groups were applied to conjugate with the amino group of the CD34 antibody. This immuno-conjugate can be applied on targeting the human CD34 positive cells, peripheral blood progenitor cells included, for cell purification and drug controlled release. In order to the active responding of controlled release of the conjugate in the body influenced by temperature, we hope to estimate the shifting of the gel-collapse temperature or cloud point of the immuno-conjugates by dynamic light scattering (DLS) and UV absorption. The results show that the gel-collapse temperature of the nano-particle was not significantly affected by the content of AA between 1.5~5 mol%. However, cloud point of the solution was elevated by the conjugation of CD34 antibody to 37°C. When CD34-conjugated particle was subsequently incorporated with recombinant FLT3-ligand, which is a smaller molecule compare to CD34 antibody, cloud point of the solution was not affected.

Thermoresponsive magnetic ionic liquids: synthesis and temperature switchable magnetic separation

RSC Advances ◽  
2016 ◽  
Vol 6 (19) ◽  
pp. 15731-15734 ◽  
Author(s):  
Qipeng Zhao ◽  
Tun Seng Herng ◽  
Chun Xian Guo ◽  
Dieling Zhao ◽  
Jun Ding ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Magnetic Separation ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Magnetic Ionic Liquids

Thermoresponsive magnetic ionic liquids (MILs) with lower critical solution temperature (LCST) below 60 °C are synthesized.

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