Thermopower method for detecting the ferrite-austenite transition: applications to surface reaction and diffusion

1981 ◽  
Vol 52 (7) ◽  
pp. 265-269
Author(s):  
Károly Lázár ◽  
András Sütö ◽  
Lajos Varga
Keyword(s):  
Surface Reaction ◽  
And Diffusion ◽  
Reaction And Diffusion

scholarly journals Determination of Inherent Dissolution Performance of Drug Substances

Pharmaceutics ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 146
Author(s):  
Dominik Sleziona ◽  
Amelie Mattusch ◽  
Gerhard Schaldach ◽  
David R. Ely ◽  
Gabriele Sadowski ◽  
...  
Keyword(s):  
Drug Release ◽  
Surface Reaction ◽  
Reaction Diffusion ◽  
Controlled Drug Release ◽  
Drug Formulation ◽  
Dissolution Behavior ◽  
Dissolution Test ◽  
Intrinsic Dissolution ◽  
And Diffusion ◽  
Reaction And Diffusion

The dissolution behavior of novel active pharmaceutical ingredients (API) is a crucial parameter in drug formulation since it frequently affects the drug release. Generally, a distinction is made between surface-reaction- and diffusion-controlled drug release. Therefore, dissolution studies such as the intrinsic dissolution test defined in the pharmacopeia have been performed for many years. In order to overcome the disadvantages of the common intrinsic dissolution test, a new experimental setup was developed within this study. Specifically, a flow channel was designed and tested for measuring the mass transfer from a flat, solid surface dissolving into a fluid flowing over the surface with well-defined flow conditions. A mathematical model was developed that distinguishes between surface-reaction- and diffusion-limited drug release based on experimental data. Three different drugs—benzocaine, theophylline and griseofulvin—were used to investigate the mass flux during dissolution due to surface reaction, diffusion and convection kinetics. This new technique shows potential to be a valuable tool for the identification of formulation strategies.

The surface reaction and diffusion of NO 2 in lead phthalocyanine thin film

1999 ◽  
Vol 342 (1-2) ◽  
pp. 238-243 ◽  
Author(s):  
Y.H. Ju ◽  
C. Hsieh ◽  
C.J. Liu
Keyword(s):  
Thin Film ◽  
Surface Reaction ◽  
And Diffusion ◽  
Reaction And Diffusion

Competition between surface reaction and diffusion of gold deposited onto ZrTe3

2003 ◽  
Vol 531 (3) ◽  
pp. 375-381 ◽  
Author(s):  
N. Jug ◽  
A. Prodan ◽  
H.J.P. van Midden ◽  
P. Starowicz ◽  
H. Böhm ◽  
...  
Keyword(s):  
Surface Reaction ◽  
And Diffusion ◽  
Reaction And Diffusion

Solid-State Reaction and Diffusion Behaviors of CaFe2O4 and TiO2 at 1373 K to 1473 K

2021 ◽  
Author(s):  
Mingrui Yang ◽  
Junyi Xiang ◽  
Chenguang Bai ◽  
Xuangeng Zhou ◽  
Zhongci Liu ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
And Diffusion ◽  
Diffusion Behaviors ◽  
Reaction And Diffusion

Decoupling Electrochemical Reaction and Diffusion Processes in Ionically-Conductive Solids on the Nanometer Scale

ACS Nano ◽  
2010 ◽  
Vol 4 (12) ◽  
pp. 7349-7357 ◽  
Author(s):  
Nina Balke ◽  
Stephen Jesse ◽  
Yoongu Kim ◽  
Leslie Adamczyk ◽  
Ilia N. Ivanov ◽  
...  
Keyword(s):  
Diffusion Processes ◽  
Electrochemical Reaction ◽  
Nanometer Scale ◽  
And Diffusion ◽  
Reaction And Diffusion

scholarly journals Reaction-Diffusion Systems: Self-Balancing Diffusion and the Use of the Extent of Reaction as a Descriptor of Reaction Kinetics

2019 ◽  
Author(s):  
Miloslav Pekař
Keyword(s):  
Reaction Kinetics ◽  
Reaction Diffusion ◽  
Reaction Diffusion Systems ◽  
Diffusion Systems ◽  
And Diffusion ◽  
Reaction And Diffusion

Self-balancing diffusion is a concept which restricts the introduction of extents of reactions. This concept is analyzed in detail for mass- and molar-based balances of reaction-diffusion mixtures, in relation to non-self-balancing cases, and with respect to its practical consequences. A note on a recent generalization of the concept of reaction and diffusion extents is also included.<br>

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