Solvent-mediated gel formation, hierarchical structures, and rheological properties of organogels

Soft Matter ◽  
2015 ◽  
Vol 11 (4) ◽  
pp. 741-748 ◽  
Author(s):  
Ming-Ming Su ◽  
Hai-Kuan Yang ◽  
Li-Jun Ren ◽  
Ping Zheng ◽  
Wei Wang
Keyword(s):  
Rheological Properties ◽  
Mixed Solvents ◽  
Hierarchical Structures ◽  
Supramolecular Structures ◽  
Gel Formation ◽  
And Performance

We report that the gel formation, supramolecular structures and performance of organogels in the cholesterol–POM–cholesterol hybrid gelator within the toluene/DMF mixed solvents can be solvent-mediated.

Rheological Properties Influence Tackiness, Application and Performance of Nail Polish/Lacquer Formulations

2021 ◽  
pp. 109-150
Author(s):  
Leidy Nallely Jimenez ◽  
Carina D. V. Martínez Narváez ◽  
Chenxian Xu ◽  
Samantha Bacchi ◽  
Vivek Sharma
Keyword(s):  
Rheological Properties ◽  
Nail Polish ◽  
And Performance

scholarly journals Fabrication and Compressive Behavior of a Micro-Lattice Composite by High Resolution DLP Stereolithography

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 785
Author(s):  
Chow Shing Shin ◽  
Yu Chia Chang
Keyword(s):  
High Resolution ◽  
Lattice Structure ◽  
Low Cost ◽  
Hierarchical Structures ◽  
Dip Coating ◽  
Unit Cell ◽  
Digital Light Processing ◽  
Unit Cell Size ◽  
Wide Range ◽  
And Performance

Lattice structures are superior to stochastic foams in mechanical properties and are finding increasing applications. Their properties can be tailored in a wide range through adjusting the design and dimensions of the unit cell, changing the constituent materials as well as forming into hierarchical structures. In order to achieve more levels of hierarchy, the dimensions of the fundamental lattice have to be small enough. Although lattice size of several microns can be fabricated using the two-photon polymerization technique, sophisticated and costly equipment is required. To balance cost and performance, a low-cost high resolution micro-stereolithographic system has been developed in this work based on a commercial digital light processing (DLP) projector. Unit cell lengths as small as 100 μm have been successfully fabricated. Decreasing the unit cell size from 150 to 100 μm increased the compressive stiffness by 26%. Different pretreatments to facilitate the electroless plating of nickel on the lattice structure have been attempted. A pretreatment of dip coating in a graphene suspension is the most successful and increased the strength and stiffness by 5.3 and 3.6 times, respectively. Even a very light and incomplete nickel plating in the interior has increase the structural stiffness and strength by more than twofold.

Use of FT-IR, FT-Raman and thermal analysis to evaluate the gel formation of curdlan produced by Agrobacterium sp. IFO 13140 and determination of its rheological properties with food applicability

2017 ◽  
Vol 232 ◽  
pp. 369-378 ◽  
Author(s):  
Camila Sampaio Mangolim ◽  
Thamara Thaiane da Silva ◽  
Vanderson Carvalho Fenelon ◽  
Adriane do Nascimento ◽  
Francielle Sato ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Rheological Properties ◽  
Gel Formation ◽  
Ft Ir ◽  
Ft Raman

scholarly journals GEL FORMATION OF CURDLAN-TYPE POLYSACCHARIDE IN DMSO-H2O MIXED SOLVENTS

1974 ◽  
Vol 3 (2) ◽  
pp. 193-196 ◽  
Author(s):  
Masuo Aizawa ◽  
Masaaki Takahashi ◽  
Shuichi Suzuki
Keyword(s):  
Mixed Solvents ◽  
Gel Formation

Thermal gelation and denaturation of bovine β-lactoglobulins A and B

1994 ◽  
Vol 61 (2) ◽  
pp. 221-232 ◽  
Author(s):  
Mary McSwiney ◽  
Harjinder Singh ◽  
Osvaldo Campanella ◽  
Lawrence K. Creamer
Keyword(s):  
Heat Treatment ◽  
Rheological Properties ◽  
Functional Property ◽  
Gel Electrophoresis ◽  
Protein Concentration ◽  
Gel Formation ◽  
Native Page ◽  
Thermal Gelation ◽  
Sds Page ◽  
Important Functional Property

SummaryHeat-induced gelation, an important functional property of β-lactoglobulin, was studied by measuring the rheological properties of both the A and B variants of the protein during and after heat treatment within a range of pH, temperature and concentration. Gel electrophoresis was used to determine the extent of denaturation and disulphide bond crosslinking of some samples. Both variants formed gel networks on heating at temperatures > 75 °C, and under most conditions the storage modulus (G′) of βlactoglobulin A gels was higher than the G′ of β-lactoglobulin B gels, in particular after cooling to 25 °C. A minimum protein concentration of 50 g/1 was required for gel formation at pH 7·0 in 0·1 M-NaCl by both variants at 80 °C. Increasing the protein concentration above 50 g/1 increased G′, the extent of increase being much greater for the A variant than the B variant. G′ of variant A gels was not much influenced by pH whereas G′ of variant B gels decreased slightly from pH 3 to pH 6 and increased between pH 6 and pH 9. When mixtures of the two variants were gelled G′ increased at the temperature of heating (80 °C) and after cooling (25 °C) as the relative quantity of variant A was increased. Comparisons of the loss of discrete protein bands from electrophoretic gels (native-PAGE, SDS-PAGE and SDS-PAGE of reduced samples) showed that heating β-lactoglobulin solutions of 100 g/1 at pH 7 in 0·1 M-NaCl and at 75, 80 and 85 °C caused a faster loss of both native and SDS-soluble β-lactoglobulin A than of β-lactoglobulin B. It was concluded that the loss of native β-lactoglobulin structure from these solutions during heating was faster than the formation of disulphidelinked aggregates, which was faster than gel formation for both β-lactoglobulin A and β-lactoglobulin B, and that each of these reactions was faster for β-lactoglobulin A than for β-lactoglobulin B. This contrasts with conclusions drawn from some previous studies and may arise from the differences in protein concentration between the present study (∼ 100 g/1) and the previous ones (< ∼ 10 g/1).

Correlation of Vulcanization and Viscoelastic Properties of Nanocomposites Based on Natural Rubber and Different Nanofillers, with Molecular and Supramolecular Structure

2010 ◽  
Vol 83 (1) ◽  
pp. 16-34 ◽  
Author(s):  
Mithun Bhattacharya ◽  
Anil K. Bhowmick
Keyword(s):  
Natural Rubber ◽  
Rheological Properties ◽  
Supramolecular Structure ◽  
Carbon Nanofiber ◽  
Volume Fraction ◽  
Barrier Properties ◽  
Qualitative Description ◽  
Viscoelastic Parameters ◽  
Low Volume ◽  
And Performance

Abstract Elastomer nanocomposites reinforced with low volume fraction of nanofillers, such as nanoclays and carbon nanofibers, have long been known to possess significantly improved mechanical, thermal, dynamic mechanical, flame retardant, and barrier properties. The present work attempts to evaluate the effect of nanofillers (like modified and unmodified montmorillonite, sepiolite, carbon nanofiber, and carbon black) and their amount on vulcanization, as well as dynamic and rheological properties in the prevulcanization and postvulcanization stages. Upon using organomodified nanoclay, optimum cure time was reduced and cure rate index increased; whereas, in comparison, carbon nanofiber resulted in a slower cure. The influence of loading of some representative nanofillers on natural rubber was studied through qualitative description of critical dynamic viscoelastic parameters, which indicated the formation of supramolecular structure even at low volume fraction. The nanocomposite vulcanizates showed solidlike rheological behavior and upon implementation of dispersion techniques the activation energy of flow was reduced by around 60%. The knowledge of cure and rheological properties of the compounds, which evolves from the structure formation, can be utilized for assessing process optimization, cost reduction, and performance of the nanocomposites.

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