scholarly journals Entropy Variation in the Two-dimensional Phase Transition of Anthracene Adsorbed at the Hg Electrode/Ethylene Glycol Solution Interface

Entropy ◽  
2010 ◽  
Vol 12 (3) ◽  
pp. 570-577 ◽  
Author(s):  
Claudio Fontanesi
Keyword(s):  
Phase Transition ◽  
Ethylene Glycol ◽  
Two Dimensional ◽  
Solution Interface ◽  
Entropy Variation ◽  
Glycol Solution

On the 2D phase transition of adenine adsorbed at the mercury/ethylene glycol solution interface

2004 ◽  
Vol 49 (9-10) ◽  
pp. 1655-1662 ◽  
Author(s):  
L BENEDETTI ◽  
G CAMURRI ◽  
C FONTANESI ◽  
P FERRARINI ◽  
R GIOVANARDI
Keyword(s):  
Phase Transition ◽  
Ethylene Glycol ◽  
Solution Interface ◽  
Glycol Solution

Temperature Effect on the Two-Dimensional Phase Transition Kinetics of Adenine Adsorbed at the Hg Electrode/Aqueous Solution Interface

2003 ◽  
Vol 68 (8) ◽  
pp. 1407-1419 ◽  
Author(s):  
Claudio Fontanesi ◽  
Roberto Andreoli ◽  
Luca Benedetti ◽  
Roberto Giovanardi ◽  
Paolo Ferrarini
Keyword(s):  
Phase Transition ◽  
Aqueous Solution ◽  
Phase Change ◽  
Temperature Effect ◽  
Transition Rate ◽  
Effect Of Temperature ◽  
Two Dimensional ◽  
Solution Interface ◽  
Phase Transition Kinetics ◽  
Kinetics Of

The kinetics of the liquid-like → solid-like 2D phase transition of adenine adsorbed at the Hg/aqueous solution interface is studied. Attention is focused on the effect of temperature on the rate of phase change; an increase in temperature is found to cause a decrease of transition rate.

Understanding Thermal Behavior of Poly(ethylene glycol)-block-poly(N-isopropylacrylamide) Hydrogel Using Two-Dimensional Correlation Infrared Spectroscopy

2021 ◽  
pp. 000370282110066
Author(s):  
Yeonju Park ◽  
Minkyoung Kim ◽  
Isao Noda ◽  
Young Mee Jung
Keyword(s):  
Phase Transition ◽  
Ethylene Glycol ◽  
Heating Process ◽  
Two Dimensional ◽  
Poly Ethylene Glycol ◽  
Thermoresponsive Polymers ◽  
Heating And Cooling ◽  
Transition Mechanism ◽  
Ft Ir ◽  
Poly Ethylene

In this study, one of the thermoresponsive polymers, block copolymer consisting of poly(ethylene glycol) and poly( N-isopropylacylamide), was investigated using Fourier transform infrared (FT-IR) spectroscopy, principal component analysis (PCA), and two-dimensional correlation spectroscopy (2D-COS). The apparent trend of the spectral changes in the temperature-dependent FT-IR spectra of poly(ethylene glycol)- block-poly( N-isopropylacylamide) (PEG- b-PNiPAAm) hydrogel during the heating process looks similar to that during the cooling process. The results of the PCA and 2D-COS, however, clearly indicate an irreversible phase transition mechanism of PEG- b-PNiPAAm hydrogel during the heating and cooling processes. It has been also shown that PEG affects the phase transition mechanism of PEG- b-PNiPAAm hydrogel, especially during the heating process. Consequently, we can successfully determine the phase transition temperature and the mechanism of PEG- b-PNiPAAm hydrogel during the heating and cooling processes using PCA and 2D-COS, respectively.

Template mediated crystal engineering

1994 ◽  
Vol 52 ◽  
pp. 480-481
Author(s):  
Brigid R. Heywood ◽  
S. Champ
Keyword(s):  
Crystal Engineering ◽  
Electrostatic Interactions ◽  
Alkyl Chain ◽  
Crystallographic Axis ◽  
Two Dimensional ◽  
Engineering Process ◽  
Solution Interface ◽  
Extensive Program ◽  
Geometric Homology ◽  
Long Alkyl Chain

Recent work on the crystallisation of inorganic crystals under compressed monomolecular surfactant films has shown that two dimensional templates can be used to promote the oriented nucleation of solids. When a suitable long alkyl chain surfactant is cast on the crystallisation media a monodispersied population of crystals forms exclusively at the monolayer/solution interface. Each crystal is aligned with a specific crystallographic axis perpendicular to the plane of the monolayer suggesting that nucleation is facilitated by recognition events between the nascent inorganic solid and the organic template.For example, monolayers of the long alkyl chain surfactant, stearic acid will promote the oriented nucleation of the calcium carbonate polymorph, calcite, on the (100) face, whereas compressed monolayers of n-eicosyl sulphate will induce calcite nucleation on the (001) face, (Figure 1 & 2). An extensive program of research has confirmed the general principle that molecular recognition events at the interface (including electrostatic interactions, geometric homology, stereochemical complementarity) can be used to promote the crystal engineering process.

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