Dipolar relaxation, conductivity, and polar order in AgCN

Autor: P. Lunkenheimer, A. Loidl, G. P. Johari

By using dielectric spectroscopy in a broad range of temperatures and frequencies, we have investigated dipolar relaxations, the dc conductivity, and the possible occurrence of polar order in AgCN. Conductivity contributions dominate the dielectric r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03b3f44651305eb700b04cd88477f08c

Endothermic Effects on Heating Physically Aged Sucrose Glasses and the Clausius Theorem Violation in Glass Thermodynamics

Autor: G. P. Johari, Elpidio Tombari

Publikováno v: The Journal of Physical Chemistry B. 124:2017-2028

Experimental heat capacity, Cp,app, of some physically aged polymers had shown an endothermic peak or a shoulder on heating when the material was still in the glassy state. In the first part of thi...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b217535cb570fdd253012cc8cfc3c5bb
https://doi.org/10.1021/acs.jpcb.9b10937

Increasing the Ambient Pressure Solubility by Forming a Glass at High Pressure and Its Thermodynamics, a Much Sought-After Pharmaceutical Advantage

Autor: G. P. Johari

Publikováno v: The Journal of Physical Chemistry B. 122:2031-2039

With the objective of increasing the bioavailability of poorly soluble curative compounds, we describe a thermodynamics-based method for increasing their solubility, σ. It requires forming their pressure-densified glassy (PDG) state by supercooling

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07e4769f70fdd41227eff0fd53540fbb
https://doi.org/10.1021/acs.jpcb.7b12432

Endothermic features on heating of glasses show that the second glass to liquid transition of water was phenomenologically-mistaken

Autor: Maria Cristina Righetti, G. P. Johari, Elpidio Tombari

Publikováno v: Thermochimica Acta 647 (2017): 101–110. doi:10.1016/j.tca.2016.11.011
info:cnr-pdr/source/autori:Righetti, Maria Cristina; Tombari, Elpidio; Johari, G. P./titolo:Endothermic features on heating of glasses show that the second glass to liquid transition of water was phenomenologically-mistaken/doi:10.1016%2Fj.tca.2016.11.011/rivista:Thermochimica Acta/anno:2017/pagina_da:101/pagina_a:110/intervallo_pagine:101–110/volume:647

When glasses formed by cooling at different rates are heated at the same rate, they show different shapes of the glass to liquid transition endotherm in their C-p-T plot and different onset temperatures of the C-p-endotherm. (This temperature is take

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c508fed95e9d7ede87d81b8ed7efe05
https://doi.org/10.1016/j.tca.2016.11.011

Variation of entropy and volume of liquids with pressure and their Kauzmann- and Simon-type extrapolations toward zero entropy

Autor: G. P. Johari

Publikováno v: Thermochimica Acta. 700:178936

Variation of the entropy of a liquid, Sliq, with temperature, T, and its extrapolation to T below the glass formation temperature are used as a basis for advancing theories of glass-formation. A liquid may be transformed into a glass also by pressuri

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1996dd4d5b368868f4b6dd9f1c7b29aa
https://doi.org/10.1016/j.tca.2021.178936