The effect of primary structural parameters of poly(methacrylic acid) xerogels on the kinetics of swelling

2012 ◽  
Vol 127 (5) ◽  
pp. 3550-3559 ◽  
Author(s):  
Jelena Jovanovic ◽  
Borivoj Adnadjevic
Keyword(s):  
Methacrylic Acid ◽  
Structural Parameters ◽  
Kinetics Of ◽  
Kinetics Of Swelling

scholarly journals Controlling the Kinetics of an Enzymatic Reaction through Enzyme or Substrate Confinement into Lipid Mesophases with Tunable Structural Parameters

2020 ◽  
Vol 21 (14) ◽  
pp. 5116
Author(s):  
Marco Mendozza ◽  
Arianna Balestri ◽  
Costanza Montis ◽  
Debora Berti
Keyword(s):  
Reaction Kinetics ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Structural Parameters ◽  
Enzymatic Reaction ◽  
X Ray Scattering ◽  
Nitrophenyl Phosphate ◽  
Vis Spectroscopy ◽  
Kinetics Of ◽  
Enzyme Alkaline Phosphatase

Lipid liquid crystalline mesophases, resulting from the self-assembly of polymorphic lipids in water, have been widely explored as biocompatible drug delivery systems. In this respect, non-lamellar structures are particularly attractive: they are characterized by complex 3D architectures, with the coexistence of hydrophobic and hydrophilic regions that can conveniently host drugs of different polarities. The fine tunability of the structural parameters is nontrivial, but of paramount relevance, in order to control the diffusive properties of encapsulated active principles and, ultimately, their pharmacokinetics and release. In this work, we investigate the reaction kinetics of p-nitrophenyl phosphate conversion into p-nitrophenol, catalysed by the enzyme Alkaline Phosphatase, upon alternative confinement of the substrate and of the enzyme into liquid crystalline mesophases of phytantriol/H2O containing variable amounts of an additive, sucrose stearate, able to swell the mesophase. A structural investigation through Small-Angle X-ray Scattering, revealed the possibility to finely control the structure/size of the mesophases with the amount of the included additive. A UV–vis spectroscopy study highlighted that the enzymatic reaction kinetics could be controlled by tuning the structural parameters of the mesophase, opening new perspectives for the exploitation of non-lamellar mesophases for confinement and controlled release of therapeutics.

The heat of interaction of polyvinylchloride with plasticizers, the kinetics of swelling and phase equilibrium

1983 ◽  
Vol 25 (7) ◽  
pp. 1668-1675 ◽  
Author(s):  
A.A. Tager ◽  
Yu.S. Bessonov ◽  
T.V. Ikanina ◽  
T.A. Rodionova ◽  
A.I. Suvorova ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Kinetics Of ◽  
Kinetics Of Swelling

Kinetics of Swelling of Cylindrical Temperature-Responsive Hydrogel: A Semi-Analytical Study

2020 ◽  
Vol 12 (08) ◽  
pp. 2050090
Author(s):  
Amir Hossein Namdar ◽  
Hashem Mazaheri
Keyword(s):  
Chemical Potential ◽  
Water Concentration ◽  
Design Procedures ◽  
Temperature Responsive ◽  
Simple Geometry ◽  
Phase Transition Temperatures ◽  
Link Density ◽  
Cross Link Density ◽  
Kinetics Of ◽  
Kinetics Of Swelling

Cylindrical hydrogels have a wide variety of applications, especially in microfluidics as micro-valves, micro-mixers, and micro-lenses. Main advantages of them can be mentioned as their simple geometry and autonomous functionality due to their responses to the environmental stimuli. In current research, kinetics of swelling, shrinking and force generation of cylindrical temperature-responsive hydrogels have been investigated analytically. According to this, models of fluid permeation and large deformation of the hydrogels were considered and an analytical solution was performed. In order to study the behavior of the cylindrical hydrogels, the temperature is changed between higher and lower of the phase transition temperatures, and kinetics of the swelling and shrinking of the hydrogel have been studied and the distribution of stresses, stretches, water concentration and chemical potential are presented throughout the process. In addition, to investigate the behavior of the actuators, the cylindrical hydrogel is placed inside a hollow permeable pillar and the pressure of the hydrogel which puts on the pillar is studied. Ultimately, a comprehensive study on the effects of different parameters, namely, amount of temperature change, cross-link density and geometry, is conducted and the results are presented, which can be utilized in the design procedures of such actuators.

Study of kinetics of vulcanization and structure of heterogeneous rubber with acrylic and methacrylic acid amides

1974 ◽  
Vol 16 (1) ◽  
pp. 256-264 ◽  
Author(s):  
A.A. Dontsov ◽  
A.A. Kanauzova ◽  
G.M. Sas'kova ◽  
B.A. Dogadkin
Keyword(s):  
Methacrylic Acid ◽  
Kinetics Of ◽  
Kinetics Of Vulcanization

Study of the kinetics of polymerization and copolymerization of methacrylic acid sulpholanate

1974 ◽  
Vol 16 (2) ◽  
pp. 405-411
Author(s):  
A.I. Vorob'eva ◽  
E.I. Ablyakimov ◽  
G.V. Leplyanin ◽  
S.R. Rafikov ◽  
G.P. Gladyshev
Keyword(s):  
Methacrylic Acid ◽  
Kinetics Of Polymerization ◽  
Kinetics Of
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