Kinetic Aspect on Gelation Mechanism of Tetra-PEG Hydrogel

2014 ◽  
Vol 47 (10) ◽  
pp. 3274-3281 ◽  
Author(s):  
Kengo Nishi ◽  
Kenta Fujii ◽  
Yukiteru Katsumoto ◽  
Takamasa Sakai ◽  
Mitsuhiro Shibayama
Keyword(s):  
Gelation Mechanism ◽  
Kinetic Aspect

Mechanochemistry of dissolution: Kinetic aspect

2007 ◽  
Vol 77 (4) ◽  
pp. 491-502 ◽  
Author(s):  
A. I. Rusanov
Keyword(s):  
Dissolution Kinetic ◽  
Kinetic Aspect

scholarly journals Gelation or molecular recognition; is the bis-(α,β-dihydroxy ester)s motif an omnigelator?

2010 ◽  
Vol 6 ◽  
pp. 1079-1088 ◽  
Author(s):  
Peter C Griffiths ◽  
David W Knight ◽  
Ian R Morgan ◽  
Amy Ford ◽  
James Brown ◽  
...  
Keyword(s):  
Molecular Recognition ◽  
Neutron Scattering ◽  
Spin Echo ◽  
Inelastic Neutron ◽  
Gelation Mechanism ◽  
Regular Structures ◽  
Low Concentrations ◽  
Wide Range ◽  
History Of ◽  
Selection Of

Understanding the gelation of liquids by low molecular weight solutes at low concentrations gives an insight into many molecular recognition phenomena and also offers a simple route to modifying the physical properties of the liquid. Bis-(α,β-dihydroxy ester)s are shown here to gel thermoreversibly a wide range of solvents, raising interesting questions as to the mechanism of gelation. At gelator concentrations of 5–50 mg ml−1, gels were successfully formed in acetone, ethanol/water mixtures, toluene, cyclohexane and chloroform (the latter, albeit at a higher gelator concentration). A range of neutron techniques – in particular small-angle neutron scattering (SANS) – have been employed to probe the structure of a selection of these gels. The universality of gelation in a range of solvent types suggests the gelation mechanism is a feature of the bis-(α,β-dihydroxy ester) motif, with SANS demonstrating the presence of regular structures in the 30–40 Å range. A correlation between the apparent rodlike character of the structures formed and the polarity of the solvent is evident. Preliminary spin-echo neutron scattering studies (SESANS) indicated the absence of any larger scale structures. Inelastic neutron spectroscopy (INS) studies demonstrated that the solvent is largely unaffected by gelation, but does reveal insights into the thermal history of the samples. Further neutron studies of this kind (particularly SESANS and INS) are warranted, and it is hoped that this work will stimulate others to pursue this line of research.

scholarly journals Specific-Ion Effects Directed Noble Metal Aerogels: Versatile Manipulation for Electrocatalysis and Beyond

2019 ◽  
Author(s):  
RAN DU ◽  
YUE HU ◽  
René Hübner ◽  
Jan-Ole Joswig ◽  
Xuelin Fan ◽  
...  
Keyword(s):  
Porous Materials ◽  
Noble Metal ◽  
Noble Metals ◽  
Sol Gel ◽  
Synthetic Methods ◽  
Superior Performance ◽  
Gelation Mechanism ◽  
Practical Applications ◽  
Specific Ion Effects ◽  
Ion Effects

<div>Noble metal foams (NMFs) are a new class of functional porous materials featuring properties of both noble metals and monolithic porous materials, providing impressive prospects in catalysis, bio-sensing, plasmonic technologies, etc...Among reported synthetic methods to date, the sol-gel approach manifests overwhelming advantages for versatile synthesis of controlled nanostructured NMFs under mild condition. However, limited gelation methods and insufficient understanding of the underlying mechanism retards structure/composition manipulation of NMFs, hampering ondemand designing for practical applications. Herein highly tunable NMFs are fabricated at room temperature by activating specific-ion effects and regulating ion-nanoparticle interactions, affording various single/alloy NMFs with adjustable compositions (Au, Ag, Pd, Pt), ligament sizes (3.1~142.0 nm), and special morphologies. Their superior performance in programmable self-propulsion devices and electrocatalytic alcohol oxidation are demonstrated. This study provides not only a conceptually new route to fabricate and manipulate functional NMFs, but also an overall picture in understanding the gelation mechanism. It may pave the way for on-target designing versatile NMFs for various applications.</div>

Effect of calcium ions on rheological properties and structure of Lycium barbarum L. polysaccharide and its gelation mechanism

2021 ◽  
pp. 107079
Author(s):  
Hailin Wang ◽  
Lijing Ke ◽  
Yanan Ding ◽  
Pingfan Rao ◽  
Tianhao Xu ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Calcium Ions ◽  
Gelation Mechanism ◽  
Lycium Barbarum

NMR studies on water and polymer diffusion in dextran gels. Influence of potassium ions on microstructure formation and gelation mechanism

1996 ◽  
Vol 35 (5) ◽  
pp. 697-705 ◽  
Author(s):  
Tokuko Watanabe ◽  
Akihiro Ohtsuka ◽  
Norio Murase ◽  
Peter Barth ◽  
Klaus Gersonde
Keyword(s):  
Potassium Ions ◽  
Polymer Diffusion ◽  
Microstructure Formation ◽  
Gelation Mechanism ◽  
Nmr Studies

A molecular description of the gelation mechanism of curdlan

2002 ◽  
Vol 30 (1) ◽  
pp. 7-16 ◽  
Author(s):  
Hongbin Zhang ◽  
Katsuyoshi Nishinari ◽  
Martin A.K. Williams ◽  
Tim J. Foster ◽  
Ian T. Norton
Keyword(s):  
Gelation Mechanism ◽  
Molecular Description

New x-ray diffraction results from agarose: Extended single helix structures and implications for gelation mechanism

Biopolymers ◽  
1989 ◽  
Vol 28 (8) ◽  
pp. 1345-1365 ◽  
Author(s):  
S. A. Foord ◽  
E. D. Y. Atkins
Keyword(s):  
X Ray Diffraction ◽  
Gelation Mechanism ◽  
X Ray ◽  
Single Helix

Processing of Poly(2,6-dimethyl-1,4-phenylene ether) with Epoxy Resin. 2. Gelation Mechanism

2000 ◽  
Vol 33 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Yoshiyuki Ishii ◽  
Anthony J. Ryan
Keyword(s):  
Epoxy Resin ◽  
Gelation Mechanism

Three-Dimensional Printing of a Tyramine Hyaluronan Derivative with Double Gelation Mechanism for Independent Tuning of Shear Thinning and Postprinting Curing

2018 ◽  
Vol 4 (8) ◽  
pp. 3088-3098 ◽  
Author(s):  
Dalila Petta ◽  
Dirk W. Grijpma ◽  
Mauro Alini ◽  
David Eglin ◽  
Matteo D’Este
Keyword(s):  
Three Dimensional ◽  
Shear Thinning ◽  
Gelation Mechanism ◽  
Three Dimensional Printing ◽  
Dimensional Printing
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