In this review, the development of low-molecular-weight gelators and polymer-based gelators is described. The driving forces for physical gelation are non-covalent bonds, such as hydrogen bonds, electrostatic interactions, van der Waals interactions and p–p interactions. When gelation occurs, the gelator molecules self-assemble into macromolecule-like aggregates through non-covalent intermolecu...

The aggregation of shape-persistent macrocycles with an empty cavity, an undecyldiether strand and a tetraethylene glycol strand leads in all cases to a macroscopic gelation of the solvent. However, the gelation temperatures are fine-tuned by the intraannular substituents.

Thiol-ene photo-click hydrogels were prepared via step-growth polymerisation using thiol-functionalised type-I collagen and 8-arm poly(ethylene glycol) norbornene-terminated (PEG-NB), as a potential injectable regenerative device. Type-I collagen was thiol-functionalised by a ring opening reaction with 2-iminothiolane (2IT), whereby up to 80 Abs. % functionalisation and 90 RPN% triple helical p...

Colloidal gelation has been extensively studied for the case of purely attractive systems, but little is understood about how colloidal gelation is affected by the presence of repulsive interactions. Here we demonstrate the gelation of a binary system of oppositely charged colloids, in which repulsive interactions compete with attractive interactions. We observe that gelation is controlled by v...

Due to their self-supporting and nanoparticulate structure, metal aerogels have emerged as excellent electrocatalysts, especially in the light of shift renewable energy cycles. While a large number synthesis parameters already been studied depth, only superficial attention has paid solvent. In order investigate influence this parameter with respect gelation time, crystallinity, morphology, or p...

Alkaline-urea aqueous solvent system provides a novel and important approach for the utilization of polysaccharide. As one of the most important polysaccharide, chitosan can be well dissolved in this solvent system, and the resultant hydrogel material possesses unique and excellent properties. Thus the sound understanding of the gelation process is fundamentally important. However, current stud...

Alginate films with different degrees of crosslinking obtained by internal and external gelation method and alginate films incorporated with oregano essential oil were prepared. The effect of mechanism of gelation and the incorporation of oregano essential oil on their optical, mechanical, antibacterial, microstructural and water vapor barrier properties were evaluated. The films subjected to e...

The present paper investigates the rheological properties of silated hydroxypropylmethylcellulose (Si-HPMC) biohydrogel used for biomaterials and tissue engineering applications. The general property of this modified cellulose ether is the occurrence of self-hardening due to silanol condensation subsequent to a decrease in pH (from 12.4 to nearly 7.4). The behavior of unsterilized and sterilize...

A chrome gel system with 13 million molecular weight and 19 polymer DQ-8 cross-linking agent is dynamically gelled under different conditions of 50-mesh 100-mesh screens shear rates. Concentration limit. The experiment shows that the critical concentration gelation 500-700mg/L, new in 80mg/L-90mg/L. cross-linker cut by steel mesh. post-gelation time prolonged. Between 6h-10h, after 12 days test...

2014 The dynamical behaviour and gelation kinetics of a copper complex substituted by eight paraffinic chains in cyclohexane has been investigated by X-band and Q-band Electron Paramagnetic Resonance spectroscopy. In the fluid-phase the complex exhibits a hyperfine structure, the anisotropy of which allows an estimate of the tumbling correlation time of the order of 4 x 10-10 s. In the gel-phas...