Theoretical and practical considerations in electrostatic depositioning of charged polymers

Zeeb, Benjamin; Thongkaew, Chutima; Weiß, Jochen

doi:10.1002/app.40099

Cited by 42 publications

(15 citation statements)

References 85 publications

(165 reference statements)

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“…In particular, the layer-by-layer (LbL) assembly of polyelectrolyte multilayers has become a simple and effective means to create thin films with diverse functional properties [122][123][124]. Figure 10a shows that chitosan's electrodeposition can be coupled with the LbL assembly-in this case for the assembly of alginate-chitosan multilayers.…”

Section: Integration With Other Assembly Methodsmentioning

confidence: 98%

Chitosan to Connect Biology to Electronics: Fabricating the Bio-Device Interface and Communicating Across This Interface

et al. 2014

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Individually, advances in microelectronics and biology transformed the way we live our lives. However, there remain few examples in which biology and electronics have been interfaced to create synergistic capabilities. We believe there are two major challenges to the integration of biological components into microelectronic systems: (i) assembly of the biological components at an electrode address, and (ii) communication between the assembled biological components and the underlying electrode. Chitosan OPEN ACCESSPolymers 2015, 7 2 possesses a unique combination of properties to meet these challenges and serve as an effective bio-device interface material. For assembly, chitosan's pH-responsive film-forming properties allow it to "recognize" electrode-imposed signals and respond by self-assembling as a stable hydrogel film through a cathodic electrodeposition mechanism. A separate anodic electrodeposition mechanism was recently reported and this also allows chitosan hydrogel films to be assembled at an electrode address. Protein-based biofunctionality can be conferred to electrodeposited films through a variety of physical, chemical and biological methods. For communication, we are investigating redox-active catechol-modified chitosan films as an interface to bridge redox-based communication between biology and an electrode. Despite significant progress over the last decade, many questions still remain which warrants even deeper study of chitosan's structure, properties, and functions.

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Section: Integration With Other Assembly Methodsmentioning

confidence: 98%

Chitosan to Connect Biology to Electronics: Fabricating the Bio-Device Interface and Communicating Across This Interface

et al. 2014

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“…This process can be repeated a number of times using a series of biopolymer solutions with alternating charge characteristics, e.g., cationic, then anionic, then cationic etc. One must be careful to control the biopolymer and droplet concentrations during this process to avoid depletion or bridging flocculation within the emulsion [49,51]. The electrostatic deposition method has also been used to create a coating of charged small oil droplets around oppositely charged large oil droplets [52].…”

Section: Droplet Charge and Other Interfacial Properties: Surfactant mentioning

confidence: 99%

Extending Emulsion Functionality: Post-Homogenization Modification of Droplet Properties

Bai

McClements

2016

Processes

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Abstract:Homogenizers are commonly used to produce oil-in-water emulsions that consist of emulsifier-coated oil droplets suspended within an aqueous phase. The functional attributes of emulsions are usually controlled by selecting appropriate ingredients (e.g., surfactants, co-surfactants, oils, solvents, and co-solvents) and processing conditions (e.g., homogenizer type and operating conditions). However, the functional attributes of emulsions can also be tailored after homogenization by manipulating their composition, structure, or physical state. The interfacial properties of lipid droplets can be altered using competitive adsorption or coating methods (such as electrostatic deposition). The physical state of oil droplets can be altered by selecting an oil phase that crystallizes after the emulsion has been formed. The composition of the disperse phase can be altered by mixing different kinds of oil droplets together to induce inter-droplet exchange of oil molecules. The local environment of oil droplets can be altered by embedding them within hydrogel beads. The aggregation state of oil droplets can be controlled by promoting flocculation. These post-homogenization methods can be used to alter functional attributes such as physical stability, rheology, optical properties, chemical degradation, retention/release properties, and/or gastrointestinal fate.

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“…Effect of surface charge. 37 This would account for the fact that the turbidity of the surrounding aqueous phase remained relatively high at all pH values for the DTAB system (Fig. The nature of the emulsier clearly had a pronounced inuence on the release characteristics of the lipid droplets from the beads (Fig.…”

Section: Release Behaviour Of Lipid Droplets Trapped In Alginate Beadsmentioning

confidence: 99%

Retention and release of oil-in-water emulsions from filled hydrogel beads composed of calcium alginate: impact of emulsifier type and pH

et al. 2015

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Delivery systems based on filled hydrogel particles (microgels) can be fabricated from natural food-grade lipids and biopolymers. The potential for controlling release characteristics by modulating the electrostatic interactions between emulsifier-coated lipid droplets and the biopolymer matrix within hydrogel particles was investigated. A multistage procedure was used to fabricate calcium alginate beads filled with lipid droplets stabilized by non-ionic, cationic, anionic, or zwitterionic emulsifiers. Oil-in-water emulsions stabilized by Tween 60, DTAB, SDS, or whey protein were prepared by microfluidization, mixed with various alginate solutions, and then microgels were formed by simple extrusion into calcium solutions. The microgels were placed into a series of buffer solutions with different pH values (2 to 11). Lipid droplets remained encapsulated under acidic and neutral conditions, but were released under highly basic conditions (pH 11) due to hydrogel swelling when the alginate concentration was sufficiently high. Lipid droplet release increased with decreasing alginate concentration, which could be attributed to an increase in the pore size of the hydrogel matrix. These results have important implications for the design of delivery systems to entrap and control the release of lipophilic bioactive components within filled hydrogel particles.

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Theoretical and practical considerations in electrostatic depositioning of charged polymers

Cited by 42 publications

References 85 publications

Chitosan to Connect Biology to Electronics: Fabricating the Bio-Device Interface and Communicating Across This Interface

Chitosan to Connect Biology to Electronics: Fabricating the Bio-Device Interface and Communicating Across This Interface

Extending Emulsion Functionality: Post-Homogenization Modification of Droplet Properties

Retention and release of oil-in-water emulsions from filled hydrogel beads composed of calcium alginate: impact of emulsifier type and pH

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