Size-dependent freezing of n-alcohols in silicon nanochannels

Berwanger, R.; Schumacher, Ch.; Huber, Patrick; Pelster, R.

doi:10.1140/epjst/e2010-01328-6

Cited by 15 publications

(15 citation statements)

References 41 publications

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“…5, bottom). Berwanger et al 47 equally found that while the solid bulk C n OHs are polycrystalline mixtures of the orthorhombic b and monoclinic g forms, 48 geometrical connement forces the C n OH chains into the more simple O-phase. According to the presented results we assume that at higher concentrations of C 16 OH (above 0.3 mol/mol, as seen in Fig.…”

Section: Effect Of C N Oh Chain Lengthmentioning

confidence: 99%

Phase behavior of the DOPE + DOPC + alkanol system

et al. 2014

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Small- and wide-angle X-ray diffraction was used to study the effect of 1-alkanols, as simple models of general anesthetics, (abbreviation CnOH, n = 8-18 is the even number of carbons in the aliphatic chain) on the lamellar to hexagonal Lα→ H(II) phase transition in the dioleoylphosphatidylethanolamine-dioleoylphosphatidylcholine = 3 : 1 mol/mol (DOPE + DOPC) system. All studied CnOHs were found to decrease the phase transition temperature of the DOPE + DOPC system in a CnOH chain length and concentration dependent manner and thus promote the formation of the HII phase. Anesthetically active C8OH and C10OH were found to decrease the lattice parameter d of the Lα phase, however longer non-anesthetic CnOHs increased the parameter d; this effect being more pronounced with increasing CnOH concentration. The lattice parameter of the HII phase was decreased in the presence of all CnOHs, even at the lowest concentrations studied. In the scope of the indirect mechanism of general anesthesia observed changes in the lattice parameter d (reflecting changes in the bilayer thickness) due to the intercalation of C8OH and C10OH might induce changes in the activity of integral membrane proteins engaged in neuronal pathways.

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Section: Effect Of C N Oh Chain Lengthmentioning

confidence: 99%

Phase behavior of the DOPE + DOPC + alkanol system

et al. 2014

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“…Morishige and Mikawa analyzed the confined crystallization process of methanol and ethanol molecules in carbon pores, and found that these composites did not crystallize unless the pores were completely filled by these molecules. When the number of carbon atoms of n ‐alcohol increased from heptanol to nonanol to undecanol, Berwanger et al found that the crystallization temperature of these confined medium‐length n ‐alcohols decreased by ca 28 K as compared with that of the corresponding bulk alcohols. To further understand the crystallization process of polymers under confined conditions, Jiang et al studied the crystal structure of poly(ethylene oxide) (PEO) in a silica matrix.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance and crystallization behavior of poly(ethylene glycol) hexadecyl ether in confined environment

Zhang

Shi

et al. 2013

Polym. Int.

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A series of poly(ethylene glycol) hexadecyl ether (Brij58)/porous active carbon (AC) composites were fabricated via a physical method, and their crystallization behavior was characterized in detail using thermogravimetric analysis, X-ray diffraction (XRD) and differential scanning calorimetry. The Brij58/AC composites exhibit a good structural-stabilized property, and the decomposition temperature is higher than that of pure components. Obvious crystalline structure and thermal behavior are found when the amount of Brij58 loaded is above 25 wt%. A new peak at 18.9 • in XRD patterns proves that the porous AC influences the crystallization and nucleation process of Brij58. From non-isothermal crystallization kinetics, the increased half-time t 1/2 and F(T) demonstrate the confined crystallization behavior of Brij58 in AC matrix because of the facile entrapment of hydrophilic poly(ethylene glycol) segments by AC nanopores. Further explanations also arise from the viewpoint of molecular mobility under nanoscale conditions.

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“…In systems where the pore-filling liquids can be freely chosen, there are other, in many respects, more advantageous options. Many liquids with high K c and significant changes in their Raman spectrum upon solidification or some other phase transition (such as acetonitrile, 46 benzene, 47 naphthalene, 48 alcohols, 49,50 nitrobenzene, 51 but also sulfur 52 ) exhibit Raman scattering cross sections that are at least 1 order of magnitude higher than that for water, which could further improve the signal-to-noise ratio or acquisition times. Hence, the proposed confocal Raman cryoprometry can detect the freezing−melting hysteresis behavior and extract porestructure information from pore volumes in the order of just a few tens of femtoliters.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Cryoporometry in Femtoliter Volumes by Confocal Raman Spectroscopy

Piela

Tyrode

2019

Langmuir

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The properties of porous material are largely dependent on the size, shape, and connectivity of the pores. Here, we present a method based on confocal Raman spectroscopy to quantify porosity using a cryoporometric approach. We show that the phase transition of water imbibed in porous silica can be accurately determined using two different, but complementary methodologies. The first one relies on integrating the temperature-dependent spectral intensities across the whole OH (H 2 O) or OD (D 2 O) stretching region. The second, more quantitative approach, deconvolutes the spectral contributions within the pores in terms of liquid and solid fractions. The results show the expected reciprocal dependence of the average phase transition point with pore size, as well as the typical hysteresis between the freezing and melting transitions. One of the key advantages of the confocal Raman approach is its high spatial resolution, with sampling volumes starting from just a few femtoliters, opening the possibility of mapping the structure in heterogeneous porous materials.

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Size-dependent freezing of n-alcohols in silicon nanochannels

Cited by 15 publications

References 41 publications

Phase behavior of the DOPE + DOPC + alkanol system

Phase behavior of the DOPE + DOPC + alkanol system

Thermal performance and crystallization behavior of poly(ethylene glycol) hexadecyl ether in confined environment

Cryoporometry in Femtoliter Volumes by Confocal Raman Spectroscopy

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