Recent Advances and Future Perspectives in Gelators Research

A special issue of Gels (ISSN 2310-2861).

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 4133

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Guest Editor
Biologie Tissulaire et Ingénierie Thérapeutique UMR 5305–Vecteurs Colloïdaux et Transport Tissulaire, Institut des Sciences Pharmaceutiques et Biologiques, Université de Lyon (UCBL), 8 Avenue Rockefeller, CEDEX 08, 69373 Lyon, France
Interests: organogels; pharmaceutical formulation; controlled drug delivery; pharmaceutics and pharmaceutical technology; drug formulation; formulation development of pharmaceuticals; pharmaceutical development; pharmaceutics; pharmaceutical research and development; polymers; rheology
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Special Issue Information

Dear Colleagues,

Recently, the design of gel-based materials, obtained from gelator molecules self-assembled into 3D network structures and entrapping various solvents, has gained research interest. Different low molecular weight organogelators (LMOG) or polymeric organogelators (POG) have been used to form in situ injectable gel materials. These systems are usually prepared by dissolving the gelator in a solvent medium and then cooling the solution below its characteristic gelation transition temperature (Tgel). Most hydrogel or organogel materials are physical gels and, unlike chemical gels (cross-linked polymers), are thermally sensitive and thermally reversible. In solution, gelators self-assemble via non-covalent interactions to form fibrous structures responsible for the gelation phenomena. One promising avenue for these gel materials used as depot formulations lies in the administration of hydrophilic and lipophilic drugs, such as cholinesterase inhibitors, vaccine adjuvants, contraceptive steroids, and anti-inflammatory and chemotherapeutic agents. They are also engineered to interact with biological systems for biomedical applications. Furthermore, another axis of research is developing a bio-inspired approach involving a bottom-up strategy for synthesizing supramolecular gels to generate novel biomaterial candidates. All these demonstrations show the importance of examining these materials and their derivatives for the preparation of new formulations or smart materials for pharmaceutical and medicinal applications. 

Dr. Plamen Kirilov
Guest Editor

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Keywords

  • hydrogels
  • organogels
  • gel-based biomaterials
  • supramolecular self-assembly
  • drug delivery systems

Published Papers (2 papers)

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Research

23 pages, 3920 KiB  
Article
Self-Assembly of Alkylamido Isophthalic Acids toward the Design of a Supergelator: Phase-Selective Gelation and Dye Adsorption
by Darren A. Makeiff, Jae-Young Cho, Bradley Smith, Rina Carlini and Nicolas Godbert
Gels 2022, 8(5), 285; https://doi.org/10.3390/gels8050285 - 5 May 2022
Cited by 4 | Viewed by 1985
Abstract
A new series of 5-alkylamido isophthalic acid (ISA) derivatives with varying single and twin alkyl chain lengths were designed and synthesized as potential supramolecular organogelators. 5-alkylamido ISAs with linear or branched alkyl tail-groups of different lengths were effective gelators for low polarity solvents. [...] Read more.
A new series of 5-alkylamido isophthalic acid (ISA) derivatives with varying single and twin alkyl chain lengths were designed and synthesized as potential supramolecular organogelators. 5-alkylamido ISAs with linear or branched alkyl tail-groups of different lengths were effective gelators for low polarity solvents. In particular, among the presented series, a derivative with a branched, 24 carbon atom tail-group behaves as a “supergelator” with up to twenty organic solvents forming gels that are highly stable over time. The gelation behavior was analyzed using Hansen solubility parameters, and the thermal stability and viscoelastic properties of select gels were characterized. Microscopy, spectroscopy, powder X-ray diffraction, and computer modeling studies were consistent with a hierarchical self-assembly process involving the formation of cyclic H-bonded hexamers via the ISA carboxylic acid groups, which stack into elementary fibers stabilized by H-bonding of the amide linker groups and π–π stacking of the aromatic groups. These new nanomaterials exhibited potential for the phase-selective gelation of oil from oil–water mixtures and dye uptake from contaminated water. The work expands upon the design and synthesis of supramolecular self-assembled nanomaterials and their application in water purification/remediation. Full article
(This article belongs to the Special Issue Recent Advances and Future Perspectives in Gelators Research)
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12 pages, 3296 KiB  
Article
The Effect of Shear Rate on Dynamic Gelation of Phenol Formaldehyde Resin Gel in Porous Media
by Haiyang Yu, Zhenfu Ma, Lin Tang, Yuesheng Li, Xianzhen Shao, Yunxia Tian, Jun Qian, Jing Fu, Dong Li, Long Wang and Fengguo Ren
Gels 2022, 8(3), 185; https://doi.org/10.3390/gels8030185 - 17 Mar 2022
Cited by 8 | Viewed by 1621
Abstract
Polymer gel is the most widely used plugging agent in profile control, whose formula and injected speed are very important process parameters. It is very significant to study the effect of shear rates on the dynamic gelation of polymer gel in porous media [...] Read more.
Polymer gel is the most widely used plugging agent in profile control, whose formula and injected speed are very important process parameters. It is very significant to study the effect of shear rates on the dynamic gelation of polymer gel in porous media for selecting suitable formula and injection speed. Taking the phenol formaldehyde resin gel with static gelation time of 21 h in ampoule bottle as research objective, it was studied the dynamic gelation process and subsequent water flooding in porous media under different injected speeds by a circulated equipment. The results shown that final dynamic gelation time is 2.4 times longer than the static gelation time in porous media. The gel particles are formed and mainly accumulated in the near wellbore zone after dynamic gelation. Injection speed has little effect on the dynamic gelation time in porous media, but has a great effect on the gel strength. The effect of injection speed on dynamic gel strength is evaluated by established the quantitative relationship between shear rate and dynamic gel strength. According to subsequent water flooding results, gel particles have certain plugging capacity in the near wellbore zone. The plugging ability declines obviously with an increasing injection speed. The experimental results provide theoretical support for the successful application of polymer gel used in profile control. Full article
(This article belongs to the Special Issue Recent Advances and Future Perspectives in Gelators Research)
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