c , T-Dependence of the Self Diffusion in Concentrated Aqueous Sucrose Solutions

Girlich, D.; Lüdemann, H.‐D.; Buttersack, Christoph; Buchholz, Klaus

doi:10.1515/znc-1994-3-415

Cited by 27 publications

(32 citation statements)

References 11 publications

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“…The self-diffusion coefficient of sucrose in aqueous bulk water is 2.7 × 10 −10 for a 10% solution and 0.23 × 10 −10 m 2 s −1 for a concentration of 50% w/w. 27 The confinement effect of the micropores is obvious. Table 1 Characterization of the Y-zeolites by the volume of micropores V micro and mesopores V meso (3-150 nm), the external surface S ext , and the water in the pores ω o in suspension.…”

Section: Rate Of Adsorptionmentioning

confidence: 99%

Adsorption of sucrose on zeolites

et al. 2016

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Section: Rate Of Adsorptionmentioning

confidence: 99%

Adsorption of sucrose on zeolites

et al. 2016

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“…In this range of sugar concentrations, the ideal glass transition temperatures in the VTF equation, T 0 , for water are almost constant and similar to that of neat water. 17,25 This is approximately in the range of carbohydrate concentrations over which Rampp et al found a dramatic increase in the ratio of water to carbohydrate translational diffusivity with falling temperature using 13 C and proton NMR. 19 In addition, Champion et al showed a decoupling between translational diffusion and viscosity in concentrated sucrose solutions near the glass transition temperature T g using the fluorescence recovery after the photobleaching method.…”

Section: Introductionmentioning

confidence: 83%

“…Because of the importance of water in the chemical and physical degradation processes in formulations containing, primarily, proteins, carbohydrates, and water, a considerable amount of experimental work has been done to study water dynamics and structure in carbohydrate-water systems as a function of carbohydrate concentration and temperature. [17][18][19][20][21][22][23][24][25][26][27][28] One of the interesting observations from these previous studies is the dynamical decoupling between water and carbohydrates. The NMR work of Girlich and Lüdemann showed that the rotational dynamics of water, described by a Vogel-Tammann-Fulcher ͑VTF͒ equation, becomes almost concentration independent at sucrose concentrations greater than 60 wt %.…”

Section: Introductionmentioning

confidence: 99%

A computational study of hydration, solution structure, and dynamics in dilute carbohydrate solutions

Lee

Debenedetti

Errington

2005

The Journal of Chemical Physics

176

198

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We report results from a molecular simulation study of the structure and dynamics of water near single carbohydrate molecules (glucose, trehalose, and sucrose) at 0 and 30 degrees C. The presence of a carbohydrate molecule has a number of significant effects on the microscopic water structure and dynamics. All three carbohydrates disrupt the tetrahedral arrangement of proximal water molecules and restrict their translational and rotational mobility. These destructuring effects and slow dynamics are the result of steric constraints imposed by the carbohydrate molecule and of the ability of a carbohydrate to form stable H bonds with water, respectively. The carbohydrates induce a pronounced decoupling between translational and rotational motions of proximal water molecules.

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“…175 An interesting situation is found in aqueous sugar solutions in which rotational diffusion of water molecules becomes very free at high sugar concentrations ͑and seems as if it is unaware of the impending glass transition͒, while translational diffusion continues to be coupled to that of the sugar molecules. 176 These systems deserve much more study.…”

Section: C5 Mobile Water Molecules In Biomaterialsmentioning

confidence: 99%

Relaxation in glassforming liquids and amorphous solids

Angell

Ngai

McKenna

et al. 2000

Journal of Applied Physics

2,120

1,876

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The field of viscousliquid and glassysolid dynamics is reviewed by a process of posing the key questions that need to be answered, and then providing the best answers available to the authors and their advisors at this time. The subject is divided into four parts, three of them dealing with behavior in different domains of temperature with respect to the glass transition temperature, Tg,and a fourth dealing with "short time processes. " The first part tackles the high temperature regime T>Tg, in which the system is ergodic and the evolution of the viscousliquid toward the condition at Tg is in focus. The second part deals with the regime T∼Tg, where the system is nonergodic except for very long annealing times, hence has time-dependent properties (aging and annealing). The third part discusses behavior when the system is completely frozen with respect to the primary relaxation process but in which secondary processes, particularly those responsible for "superionic" conductivity, and dopart mobility in amorphous silicon, remain active. In the fourth part we focus on the behavior of the system at the crossover between the low frequency vibrational components of the molecular motion and its high frequency relaxational components, paying particular attention to very recent developments in the short time dielectric response and the high Qmechanical response. The field of viscous liquid and glassy solid dynamics is reviewed by a process of posing the key questions that need to be answered, and then providing the best answers available to the authors and their advisors at this time. The subject is divided into four parts, three of them dealing with behavior in different domains of temperature with respect to the glass transition temperature, T g , and a fourth dealing with ''short time processes.'' The first part tackles the high temperature regime TϾT g , in which the system is ergodic and the evolution of the viscous liquid toward the condition at T g is in focus. The second part deals with the regime TϳT g , where the system is nonergodic except for very long annealing times, hence has time-dependent properties ͑aging and annealing͒. The third part discusses behavior when the system is completely frozen with respect to the primary relaxation process but in which secondary processes, particularly those responsible for ''superionic'' conductivity, and dopart mobility in amorphous silicon, remain active. In the fourth part we focus on the behavior of the system at the crossover between the low frequency vibrational components of the molecular motion and its high frequency relaxational components, paying particular attention to very recent developments in the short time dielectric response and the high Q mechanical response.

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c , T-Dependence of the Self Diffusion in Concentrated Aqueous Sucrose Solutions

Cited by 27 publications

References 11 publications

Adsorption of sucrose on zeolites

Adsorption of sucrose on zeolites

A computational study of hydration, solution structure, and dynamics in dilute carbohydrate solutions

Relaxation in glassforming liquids and amorphous solids

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