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Enhancement and maximum in the isobaric specific-heat capacity measurements of deeply supercooled water using ultrafast calorimetry.
Pathak H, Späh A, Esmaeildoost N, Sellberg JA, Kim KH, Perakis F, Amann-Winkel K, Ladd-Parada M, Koliyadu J, Lane TJ, Yang C, Lemke HT, Oggenfuss AR, Johnson PJM, Deng Y, Zerdane S, Mankowsky R, Beaud P, Nilsson A. Pathak H, et al. Proc Natl Acad Sci U S A. 2021 Feb 9;118(6):e2018379118. doi: 10.1073/pnas.2018379118. Proc Natl Acad Sci U S A. 2021. PMID: 33526683 Free PMC article.
Evaporative cooling of 15-m diameter droplets in vacuum enabled us to reach a temperature down to 228 K with a small fraction of the droplets remaining unfrozen. We observed a sharp increase in C(p), from 88 J/mol/K at 244 K to about 218 J/mol/K at 229 …
Evaporative cooling of 15-m diameter droplets in vacuum enabled us to reach a temperature down to 228 K with a small fraction of the …
Diffusive dynamics during the high-to-low density transition in amorphous ice.
Perakis F, Amann-Winkel K, Lehmkühler F, Sprung M, Mariedahl D, Sellberg JA, Pathak H, Späh A, Cavalca F, Schlesinger D, Ricci A, Jain A, Massani B, Aubree F, Benmore CJ, Loerting T, Grübel G, Pettersson LGM, Nilsson A. Perakis F, et al. Proc Natl Acad Sci U S A. 2017 Aug 1;114(31):8193-8198. doi: 10.1073/pnas.1705303114. Epub 2017 Jun 26. Proc Natl Acad Sci U S A. 2017. PMID: 28652327 Free PMC article.
By analyzing the structure factor and the radial distribution function, the coexistence of two structurally distinct domains is observed at T = 125 K. XPCS probes the dynamics in momentum space, which in the SAXS geometry reflects structural relaxation on the nanometer len …
By analyzing the structure factor and the radial distribution function, the coexistence of two structurally distinct domains is observed at …
Freezing of heavy water (D2O) nanodroplets.
Bhabhe A, Pathak H, Wyslouzil BE. Bhabhe A, et al. J Phys Chem A. 2013 Jul 3;117(26):5472-82. doi: 10.1021/jp400070v. Epub 2013 Jun 24. J Phys Chem A. 2013. PMID: 23763363
The temperatures corresponding to the onset of D2O ice nucleation are higher than those reported for H2O by Manka et al. [Manka, A.; Pathak, H.; Tanimura, S.; Wolk, J.; Strey, R.; Wyslouzil, B. E. Phys. ...L.; Wilson, T. W.; Bull, S. J.; Wills, R. H.; Christenson, H. K …
The temperatures corresponding to the onset of D2O ice nucleation are higher than those reported for H2O by Manka et al. [Manka, A.; Path …
X-ray studies of the transformation from high- to low-density amorphous water.
Mariedahl D, Perakis F, Späh A, Pathak H, Kim KH, Benmore C, Nilsson A, Amann-Winkel K. Mariedahl D, et al. Philos Trans A Math Phys Eng Sci. 2019 Jun 3;377(2146):20180164. doi: 10.1098/rsta.2018.0164. Philos Trans A Math Phys Eng Sci. 2019. PMID: 30982458 Free PMC article.
Heating equilibrated high-density amorphous ice (eHDA) at a fast rate (4 K min(-1)), the transition to the low-density form occurs very rapidly, while domains of both high- and low-density coexist. ...
Heating equilibrated high-density amorphous ice (eHDA) at a fast rate (4 K min(-1)), the transition to the low-density form occurs ve …
Binding interactions of Vildagliptin with pepsin: A multi-spectroscopic and in-silico approach and a comparative account with metformin.
Verma P, Kaur L, Aswal P, Singh A, Pandey R, Ojha H, Pathak M. Verma P, et al. Spectrochim Acta A Mol Biomol Spectrosc. 2024 Jan 5;304:123368. doi: 10.1016/j.saa.2023.123368. Epub 2023 Sep 6. Spectrochim Acta A Mol Biomol Spectrosc. 2024. PMID: 37748335
Fluorescence study revealed the binding-constant value which was found to be 0.559 10(3) M(-1) at 298.15 K that is non-covalent in nature. VDG-pepsin complex shows exothermic and spontaneous binding as confirmed by the calculated values of deltaH, deltaS, and deltaG, are m …
Fluorescence study revealed the binding-constant value which was found to be 0.559 10(3) M(-1) at 298.15 K that is non-covalent in na …
Highly efficient infrared to visible up-conversion emission tuning from red to white in Eu/Yb co-doped NaYF4 phosphor.
Pathak TK, Kumar A, Erasmus LJB, Pandey A, Coetsee E, Swart HC, Kroon RE. Pathak TK, et al. Spectrochim Acta A Mol Biomol Spectrosc. 2019 Jan 15;207:23-30. doi: 10.1016/j.saa.2018.08.064. Epub 2018 Sep 1. Spectrochim Acta A Mol Biomol Spectrosc. 2019. PMID: 30195182
The temperature sensitivity associated with the Er(3+) peaks at 520 and 542 nm was assessed as a function of temperature and the maximum of 0.0040 K(-1) occurred at 463 K....
The temperature sensitivity associated with the Er(3+) peaks at 520 and 542 nm was assessed as a function of temperature and the maximum of …
Photoluminescence studies on the complexation of Eu(III) and Tb(III) with acetohydroxamic acid (AHA) in nitrate medium.
Pathak PN, Mohapatra M, Godbole SV. Pathak PN, et al. Spectrochim Acta A Mol Biomol Spectrosc. 2013 Nov;115:805-9. doi: 10.1016/j.saa.2013.06.104. Epub 2013 Jul 6. Spectrochim Acta A Mol Biomol Spectrosc. 2013. PMID: 23892121
The corrected fluorescence intensities were used to calculate the stability constant (log K) for the formation of 1:1 Eu(3+)-AHA complex as 1.420.64 under the conditions of this study. ...The spectral changes in Tb(III)-AHA system showed the formation of 1:1 complex (log …
The corrected fluorescence intensities were used to calculate the stability constant (log K) for the formation of 1:1 Eu(3+)-AHA comp …
Microhydration of NO3(-): a theoretical study on structure, stability and IR spectra.
Pathak AK, Mukherjee T, Maity DK. Pathak AK, et al. J Phys Chem A. 2008 Apr 17;112(15):3399-408. doi: 10.1021/jp711108q. Epub 2008 Mar 8. J Phys Chem A. 2008. PMID: 18327926
Weighted average IR spectra are calculated on the basis of statistical population of individual configurations of each size cluster at 150 K....
Weighted average IR spectra are calculated on the basis of statistical population of individual configurations of each size cluster at 150 …