Reinforcement of nanostructured organogels by hydrogen bonds

Pirner, Daniela; Dulle, Martin; Mauer, Miriam E. J.; Förster, Stephan

doi:10.1039/c6ra03567a

Cited by 8 publications

(6 citation statements)

References 24 publications

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“…Organogels can be structured forming a fibrous 3D network, where the solvent is trapped in the structuring matrix, avoiding the flow of solvent. The network is stabilized by weak interactions between the chains, such as hydrogen bonds, van der Waals forces, and π staking [40][41][42][43]. Although it is known that organogels are formed through weak intermolecular interactions between the structurant molecules, which generate three-dimensional networks [44], there is still a lack of fundamental understanding of the type of interactions that are required [32].…”

Section: Definitions and Mechanismsmentioning

confidence: 99%

Conventional and Unconventional Crystallization Mechanisms

Chaves¹,

Silva²,

Domingues³

et al. 2019

Crystal Growth

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Understanding the crystallization behavior of fats and oils is essential to ensure certain desirable characteristics in a given industrial application. In recent years, some advances in the structuring of lipid phases have enabled a direct influence on the food properties. The structuring mechanisms of lipid bases can be classified as either conventional or unconventional. Conventional crystallization mechanisms consist of nucleation, growth, and maturation of the crystals, thus resulting in a crystalline lattice. Co-crystallization or seeding agents and emerging technologies such as ultrasound can be used to aid in crystallization and improve the physical properties of fats and oils. Unconventional mechanisms bring organogel technology as a trend, which consists in the use of self-assembly agents to entrap the liquid oil, resulting in a structured gel network. In this chapter, the formation process of crystalline networks and gel networks will be presented in stages, highlighting the main differences related to the mechanisms of formation and stabilization of both types of networks.

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Section: Definitions and Mechanismsmentioning

confidence: 99%

Conventional and Unconventional Crystallization Mechanisms

Chaves¹,

Silva²,

Domingues³

et al. 2019

Crystal Growth

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show abstract

“…tensile, [122,123] compression, [124][125][126] or rheology tests. [66,107,[127][128][129][130][131] Here, bulk samples or concentrated suspensions of hydrogel particles are formed into specimens in the mm-size range, which provide the advantage of simple sample handling and direct mechanical read-out. The drawback of these macroscopic techniques in the context of micron-sized particles, however, is that they produce ensemble-averaged values.…”

Section: From Macroscopic To Microscopic Characterizationmentioning

confidence: 99%

“…For their definitions and theoretical models describing their relation to other sample properties, we refer the reader to the work of Lai et al On macroscopic scale, mechanical parameters of hydrogels are usually quantified by standard tests performed in material science, e.g. tensile, compression, or rheology tests . Here, bulk samples or concentrated suspensions of hydrogel particles are formed into specimens in the mm‐size range, which provide the advantage of simple sample handling and direct mechanical read‐out.…”

Section: Characterization Of Microgel Mechanics By Single‐particle Me...mentioning

confidence: 99%

Mechanically Defined Microgels by Droplet Microfluidics

Heida

Neubauer

Seuß

et al. 2016

Macro Chemistry & Physics

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Over the last two decades, droplet‐based microfluidics has evolved into a versatile tool for fabricating tailored micrometer‐sized hydrogel particles. Combining precise fluid handling down to femtoliter scale with diverse hydrogel precursor design, it allows for excellent control over microgel size and shape, but also functionalization and crosslinking density. Consequently, it is possible to tune physicochemical and mechanical properties such as swelling, degradation, stimuli sensitivity, and elasticity by microfluidic droplet templates. This has led to a recent trend in applying microgels as experimental platform in cell culturing, drug delivery, sensing, and tissue engineering. This article highlights advances in microfluidic droplet formation as templates for microgels with tailored physicochemical properties. Special focus is put on evolving design strategies for the synthesis of mechanically defined microgels, their applications, and methods for mechanical characterization on single‐particle level.

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“…[22][23][24] If the organogel has thermoreversible properties, micromolding can be used to create a defined structure. [25] The fabrication of micro-or nano structured organogels can be controlled via supramolecular selfassembly. [26,27] While this approach does not require templates, it lacks variety and predictability of structures and is restricted to certain starting materials (e.g., LMOGs, block copolymers).…”

Section: Introductionmentioning

confidence: 99%

Inherently UV Photodegradable Poly(methacrylate) Gels

Scheiger

Brehm

et al. 2021

Adv Funct Materials

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Organogels (hydrophobic polymer gels) are soft materials based on polymeric networks swollen in organic solvents. They are hydrophobic and possess a high content of solvent and low surface adhesion, rendering them interesting in applications such as encapsulants, drug delivery, actuators, slippery surfaces (self-cleaning, anti-waxing, anti-bacterial), or for oil-water separation. To design functional organogels, strategies to control their shape and surface structure are required. Herein, the inherent UV photodegradability of poly(methacrylate) organogels is reported. No additional photosensitizers are required to efficiently degrade organogels (d ≈ 1 mm) on the minute scale. A low UV absorbance and a high swelling ability of the solvent infusing the organogel are found to be beneficial for fast photodegradation, which is expected to be transferrable to other gel photochemistry. Organogel arrays, films, and structured organogel surfaces are prepared, and their extraction ability and slippery properties are examined. Films of inherently photodegradable organogels on copper circuit boards serve as the first ever positive gel photoresist. Spatially photodegraded organogel films protect or reveal copper surfaces against an etchant (FeCl 3 aq. ).

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Reinforcement of nanostructured organogels by hydrogen bonds

Abstract: Reinforcing a micellar organogel by self-complementary hydrogen bonds.

Cited by 8 publications

References 24 publications

Conventional and Unconventional Crystallization Mechanisms

Conventional and Unconventional Crystallization Mechanisms

Mechanically Defined Microgels by Droplet Microfluidics

Inherently UV Photodegradable Poly(methacrylate) Gels

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