Nanoindentation of clay colloidosomes

Mallikarjunachari, G.; Nallamilli, Trivikram; Ravindran, Parag; Basavaraj, Madivala G.

doi:10.1016/j.colsurfa.2018.04.041

Cited by 6 publications

(4 citation statements)

References 53 publications

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“…Among the most common emulsion stabilizers, low molecular weight surfactants have been broadly used for emulsion stabilization [175][176][177]. However, they are highly toxic for cells, limiting their use in systems with biological applications [178,179].…”

Section: Emulsion Stabilizationmentioning

confidence: 99%

Methods for producing microstructured hydrogels for targeted applications in biology

Garcia

Kiick

2019

Acta Biomaterialia

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Hydrogels have been broadly studied for applications in clinically motivated fields such as tissue regeneration, drug delivery, and wound healing, as well as in a wide variety of consumer and industry uses. While the control of mechanical properties and network structures are important in all of these applications, for regenerative medicine applications in particular, matching the chemical, topographical and mechanical properties for the target use/tissue is critical. There have been multiple alternatives developed for fabricating materials with microstructures with goals of controlling the spatial location, phenotypic evolution, and signaling of cells. The commonly employed polymers such as poly(ethylene glycol) (PEG), polypeptides, and polysaccharides (as well as others) can be processed by various methods in order to control material heterogeneity and microscale structures. We review here the more commonly used polymers, chemistries, and methods for generating microstructures in biomaterials, highlighting the range of possible morphologies that can be produced, and the limitations of each method. With a focus in liquidliquid phase separation, methods and chemistries well suited for stabilizing the interface and arresting the phase separation are covered. As the microstructures can affect cell behavior, examples of such effects are reviewed as well.

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Section: Emulsion Stabilizationmentioning

confidence: 99%

Methods for producing microstructured hydrogels for targeted applications in biology

Garcia

Kiick

2019

Acta Biomaterialia

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“…Two related areas where clay wrapping has been studied and developed are for Pickering emulsion [90] stabilization [91][92][93][94][95] by assembling clay colloidal layers bonded to emulsion drop interfaces by capillary forces (Fig. 9c), and for fabrication of colloidosomes [96] from assemblies of clay layers [97,98] (Fig. 9b).…”

Section: Fig 2 Adopted From Supplementary Informationmentioning

confidence: 99%

Clay nanolayer encapsulation, evolving from origins of life to future technologies

Fossum

2020

Eur. Phys. J. Spec. Top.

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Clays are the siblings of graphite and graphene/graphene-oxide. There are two basic ways of using clays for encapsulation of sub-micron entities such as molecules, droplets, or nanoparticles, which is either by encapsulation in the interlayer space of clay nanolayered stacked particles (“the graphite way”), or by using exfoliated clay nanolayers to wrap entities in packages (“the graphene way”). Clays maybe the prerequisites for life on earth and can also be linked to the natural formation of other two-dimensional materials such as naturally occurring graphite and its allotropes. Here we discuss state-of-the-art in the area of clay-based encapsulation and point to some future scientific directions and technological possibilities that could emerge from research in this area.

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“…36 The capsules with stable shells can be composed of granular 37 or colloidal particles. 38 The sizes of particle capsules range from hundreds of nanometers to few millimeters. 39 In the present study, we use microparticles to form sub-millimeter and millimeter-sized capsules.…”

Section: Introductionmentioning

confidence: 99%

“…Their permeability and mechanical properties can be tuned by adequately choosing parameters of the process of the particle shell reinforcement, e.g., sintering time and temperature . The capsules with stable shells can be composed of granular or colloidal particles . The sizes of particle capsules range from hundreds of nanometers to few millimeters .…”

Section: Introductionmentioning

confidence: 99%

Direction-Specific Release from Capsules with Homogeneous or Janus Shells Using an Ultrasound Approach

Kubiak

Banaszak

Józefczak

et al. 2020

ACS Appl. Mater. Interfaces

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A variety of approaches have been developed to release contents from capsules, including techniques that use electric or magnetic fields, light, or ultrasound as a stimulus. However, in the majority of the known approaches, capsules are disintegrated in violent way and the liberation of the encapsulated material is often in a random direction. Thus, the controllable and direction-specific release from microcapsules in a simple and effective way is still a great challenge. This greatly limits the use of microcapsules in applications where targeted and directional release is desirable. Here, we present a convenient ultrasonic method for controllable and unidirectional release of an encapsulated substance. The release is achieved by using MHz-frequency ultrasound that enables the inner liquid stretching, which imposes mechanical stress on the capsule’s shell. This leads to the puncturing of the shell and enables smooth liberation of the liquid payload in one direction. We demonstrate that 1–4.3 MHz acoustic waves with the intensity of a few W/cm2 are capable of puncturing of particle capsules with diameters ranging from around 300 μm to 5 mm and the release of the encapsulated liquid in a controlled manner. Various aspects of our route, including the role of the capsule size, ultrasound wavelength, and intensity in the performance of the method, are studied in detail. We also show that the additional control of the release can be achieved by using capsules having patchy shells. The presented method can be used to facilitate chemical reactions in micro- and nanolitre droplets and various small-scale laboratory operations carried in bulk liquids in microenvironment. Our results may also serve as an entry point for testing other uses of the method and formulation of theoretical modeling of the presented ultrasound mechanism.

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Nanoindentation of clay colloidosomes

Cited by 6 publications

References 53 publications

Methods for producing microstructured hydrogels for targeted applications in biology

Methods for producing microstructured hydrogels for targeted applications in biology

Clay nanolayer encapsulation, evolving from origins of life to future technologies

Direction-Specific Release from Capsules with Homogeneous or Janus Shells Using an Ultrasound Approach

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