Glass transition at interfaces

Salez, Thomas; McGraw, Joshua D.; Dalnoki-Veress, Kari; Raphaël, Élie; Forrest, James A.

doi:10.1051/epn/2017103

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…Additional satellite peak (reasonably referred to as the post-PDP) located at right-sided tail can be fitted to this diffuse halo to justify its asymmetric shape. Noteworthy, in this case, the relation similar to the above (7) can be evidenced as being close to the Ehrenfest number 1.23: Therefore, we can reasonably speculate that asymmetry in the PDP can be caused by superposition of broadened Braggdiffraction reflexes from inter-planar correlations (due to remnants of some quasi-crystalline planes) superimposed by Ehrenfest-diffraction reflexes from most prominent correlations between some atomic pairs belonging to these planes.…”

Section: Mm-derived Medium-range Ordering In As-sesupporting

confidence: 76%

“…2,3 However, because of native metastability proper to disordered state, the consequences of MM are merely hidden for glasses derived by conventional melt-quenching. Being nanostructurized, they reveal deeply depressed glass-transition temperatures T g and respectively accelerated ability to physical aging, [4][5][6][7][8] while an adequate picture of responsible nanostructure transformations remains rather unclear.…”

Section: Introductionmentioning

confidence: 99%

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Effect of high‐energy mechanical milling on the medium‐range ordering in glassy As‐Se

et al. 2019

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Effect of high‐energy mechanical milling on glassy AsxSe100 − x (5 ≤ x ≤ 75) is recognized with X‐ray powder diffraction analysis applied to their diffuse halos ascribed to intermediate—and extended‐range structural ordering, which are revealed respectively in the first sharp diffraction peak (FSDP) and principal diffraction peak (PDP). Straightforward interpretation of the results is developed within modified microcrystalline approach, treating diffuse halos as superposition of broadened Bragg‐diffraction reflexes from remnants of inter‐planar correlations, supplemented by inter‐atomic Ehrenfest‐diffraction reflexes from most prominent inter‐atomic and inter‐molecular correlations between cage‐like molecules (such As4Se4 and/or As4Se3). Milling is shown to be ineffective in glassy arsenoselenides near Se (x < 20), while causing increase in the FSDP width for glasses with 20 ≤ x ≤ 40 due to destroyed inter‐planar ordering. Remnants of cage‐like molecules in over‐stoichiometric As‐rich AsxSe100 − x glasses (40 ≤ x ≤ 75) disappear under milling, promoting formation of higher polymerized structural network. This milling‐driven reamorphization results in a drastic increase in the FSDP position and fragmentation impact on the correlation length of the FSDP‐responsible entities. Breakdown in intermediate‐range ordering in these glasses is accompanied by changes in their extended‐range ordering revealed in high‐angular shift and broadening of the PDP. This effect is concomitant with the disappearance of distant inter‐atomic correlations between quasi‐crystalline planes in the milled arsenoselenide glasses at a cost of prolonged correlations dominating in their extended‐range ordering.

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Section: Mm-derived Medium-range Ordering In As-sesupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Effect of high‐energy mechanical milling on the medium‐range ordering in glassy As‐Se

et al. 2019

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“…At first, a PS layer with an optimal thickness was formed on the Au sensor chips. The glass-transition temperature of a thin PS film, i.e., thickness below 50 nm, is thickness-dependent [ 30 ]. In addition, the surface viscoelastic property and the surface dynamic storage modulus on the PS film increased with the decreasing thickness below 80 nm [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

“…The objective of this work was to establish thermoresponsive surfaces on sensor chips, which correspond to thermoresponsive tissue-culture PS dishes, in order to explore the thermoresponsive dynamic behavior of serum protein adsorption/desorption. A basal PS film was formed with a thickness of more than 100 nm, and the glass-transition temperature and surface viscoelastic properties of the PS film were similar to those of the bulk [ 30 , 31 ]. Subsequent grafting of thermoresponsive polymers by electron-beam irradiation was carried out, according to the method that was used in previous reports [ 17 , 38 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Temperature Changes on Serum Protein Adsorption on Thermoresponsive Cell-Culture Surfaces Monitored by A Quartz Crystal Microbalance with Dissipation

Kobayashi

Arisaka

Yui

et al. 2018

IJMS

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Thermoresponsive cell-culture polystyrene (PS) surfaces that are grafted with poly(N-isopropylacrylamide) (PIPAAm) facilitate the cultivation of cells at 37 °C and the detachment of cultured cells as a sheet with an underlying extracellular matrix (ECM) by reducing the temperature. However, the ECM and cell detachment mechanisms are still unclear because the detachment of cells from thermoresponsive surfaces is governed by complex interactions among the cells/ECM/surface. To explore the dynamic behavior of serum protein adsorption/desorption, thermoresponsive surfaces that correspond to thermoresponsive tissue-culture PS dishes were formed on sensor chips for quartz crystal microbalance with dissipation (QCM-D) measurements. X-ray photoelectron spectroscopy (XPS) measurements and temperature-dependent frequency and dissipation shifts, Δf and ΔD, using QCM-D revealed that the thermoresponsive polymers were successfully grafted onto oxidized, thin PS films on the surfaces of the sensor chips. Increased amounts of adsorbed bovine serum albumin (BSA) and fibronectin (FN) were observed on the thermoresponsive polymer-grafted surfaces at 37 °C when compared with those at 20 °C because of enhanced hydrophobic interactions with the hydrophobic, thermoresponsive surface. While the calculated masses of adsorbed BSA and FN using QCM-D were 3–5 times more than those that were obtained from radiolabeling, the values were utilized for relative comparisons among the same substrate. More importantly, the thermoresponsive, dynamic behavior of serum protein adsorption/desorption was monitored using the QCM-D technique. Observations of this dynamic behavior revealed that the BSA and FN that were adsorbed at 37 °C remained on both surfaces after decreasing the temperature to 20 °C.

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“…Recently, numerous experiments probing vitrification dynamics in the nanostructurized glasses clearly demonstrates surface effects, revealed as negative deviations from bulk glass-transition temperature T g (that is the T g depression [4][5][6][7]) and accelerated physical ageing (see, e.g., ref. [8] and literature therein).…”

Section: Introductionmentioning

confidence: 99%

Effect of high-energy mechanical milling on the FSDP-related XRPD correlations in Se-rich glassy arsenic selenides

Shpotyuk

Boussard‐Plédel

Bureau

et al. 2019

Journal of Physics and Chemistry of Solids

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The X-ray powder diffraction (XRPD) patterns related to the first sharp diffraction peak (FSDP) are registered for Se-rich As x Se 100-x glasses (5≤x≤40), subjected to high-energy mechanical milling in a dry mode with 500 min-1 rotational speed. The results are treated in terms of structural model assuming broad diffraction halos in the XRPD patterns appeared due to remnants of inter-planar "quasi-crystalline" correlations, disturbed by overlapping with diffuse halos originated from strongest inter-atomic correlations, in part, the nearest-neighbor correlations between cation-like atoms. Milling does not influence the FSDP in a vicinity of glassy Se (x<20), while causes increase in the FSDP width ∆Q (the reduced correlation length L) in the glasses with 20≤x<40, these changes being ascribed to disturbed inter-planar arrangement in covalent-bonded network due to structural defects generated under attrition ball milling. Assuming contribution of the Ehrenfest diffraction from coordination spheres in the detected XRPD patterns, the latter is ascribed to broadening in the distribution of characteristic FSDP-related inter-atomic distances, thus testifying in a favor of more defective structure of milled glass.

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Glass transition at interfaces

Cited by 6 publications

References 5 publications

Effect of high‐energy mechanical milling on the medium‐range ordering in glassy As‐Se

Effect of high‐energy mechanical milling on the medium‐range ordering in glassy As‐Se

Effect of Temperature Changes on Serum Protein Adsorption on Thermoresponsive Cell-Culture Surfaces Monitored by A Quartz Crystal Microbalance with Dissipation

Effect of high-energy mechanical milling on the FSDP-related XRPD correlations in Se-rich glassy arsenic selenides

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