Mechanical behaviour of micro-capsules and their rupture under compression

Ghaemi, Ali; Philipp, Alexandra; Bauer, Andreas; Fery, Andreas; Gekle, Stephan

doi:10.1016/j.ces.2015.11.002

Cited by 55 publications

(49 citation statements)

References 34 publications

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“…It has been reported that microencapsulation of functional foods is an effective approach to achieve the desired attributes of stability, storability, and delivery [8]. Microencapsulation is mainly used to encapsulate a gel, solid, liquid, or gas core by a coating shell [9], which is a promising technique for maintaining the viability of fish oil during the process and covering the smell of fish [10]. Microencapsulation technology could isolate functional oils from deteriorating effects of air, mitigate the evaporation rate of volatile cores, mask the taste or odor of core materials, and isolate reactive core materials from chemical attacks [11].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Different Drying Methods of Fish Oil Microcapsules

Pang

Duan

Ren

et al. 2017

Journal of Food Quality

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Microencapsulation is widely used to minimize the oxidation of fish oil products. This study compared the effects of different drying methods, for example, spray drying (SD), freeze drying (FD), and spray freeze drying (SFD) on the microencapsulation of fish oil. Spray drying (SD) is the most common method for producing fish oil microcapsules, and it has low operation cost and short processing time, while the product yield and quality are poor. Freeze drying (FD) can be used to produce oil microcapsules with high quality, but it takes long time and high overall cost for drying. Spray freeze drying (SFD) is a new method for the preparation of microcapsules, which combines the SD and FD processes to obtain high quality powder. The yield of powder reached 95.07% along with porous structure by SFD. The stability and slow-release property of SFD products were better than those of SD and FD, which showed that SFD improved product storage stability and potential digestibility.

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Section: Introductionmentioning

confidence: 99%

Comparative Study on Different Drying Methods of Fish Oil Microcapsules

Pang

Duan

Ren

et al. 2017

Journal of Food Quality

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“…Iterate procedures [2,3] until Eqs. (8) and (14) are satisfied. The iteration procedures [2,3] were performed by the Newton method, in which the Jacobian matrix of 2 !…”

Section: Deformation Modelmentioning

confidence: 96%

“…Several experimental methods have been used for determining the mechanical properties of microcapsules: micropipette aspiration [4,5], atomic force microscopy (AFM) [6][7][8], optical tweezers [9,10], magnetic tweezers [11], microfluidic channels [12], and poking [13][14][15]. Another widely used method is parallelplate compression [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization of APA Microcapsules by Parallel-Plate Compression

Bando

Yamaguchi

2017

J. Memb. Separ. Tech.

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We produced microcapsules of alginate-poly(L)lysine-alginate (APA)with diameters on the order of 10 µm. To characterize their mechanical properties, we conducted an experiment on the parallel-plate compression of a microcapsule and modeled its deformation. In the modeling task, the microcapsule was assumed to be a spherical liquidfilled elastic membrane with negligible bending stiffness and permeability. The membrane thickness was estimated by applying Reissner's linear elastic theory to the experimental force-displacement relationship during loading in the small displacement region. The initial stretch of the membrane was taken into account; it was mainly caused by the osmotic pressure difference across the membrane. The initial stretch of the microcapsule was determined by fitting the calculated and experimental force-displacement relationships during loading at small to medium displacements. At large displacements, the calculated force was smaller than the experimentally measured force because of fluid permeation across the APA membrane. The calculated and experimentally imaged shapes of the deformed microcapsule were compared. The effects of varying the membrane thickness on the force-displacement and transmural pressuredisplacement curves were shown, and the limitations of applying the present deformation model were examined.

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“…In addition, the effects of the crack path on the microcapsule performances were explored based on linear elastic fracture mechanics through simulation method (Figure d). Moreover, the effects of experimental condition on particle size distribution, shell thicknesses, thermal stability, and resistance to solvents were explored, which made an important contribution to the preparation and application of visualized microcapsules …”

Section: Principle Of Visual Microencapsulation Sensormentioning

confidence: 99%

Microcapsule‐Based Visualization Smart Sensors for Damage Detection: Principles and Applications

Zheng

Wang

et al. 2019

Adv Materials Technologies

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The smart sensor is an effective way to detect damage and improve structural safety in structural health monitoring. Microcapsule‐based visualization sensors stand out from the smart sensors. Here, the research progress of microcapsule visualization materials in recent years is summarized and the sensing principles, influence factors, performances, applications, and future prospects are introduced. The way to achieve the visualizing function of microcapsule visualization sensors is the fabrication of microcapsules that are encapsulated with solutions of dyes or indicator. When the protective shell of microcapsules is broken, the dyes will be released and activated under optical, chemical, or mechanical conditions. These visualized microcapsules can be added to the interior of the structure or prepared as a coating to provide structural health monitoring of the interior and surface of the structure. They can accurately detect microcracks and highlight them in bright colors. Additionally, the structural health monitoring applications of microcapsule visualization sensing coatings in concrete, asphalt, and steel are presented with detailed examples. The development and application of these microcapsule visualization sensors are of great significance in improving the structural life and avoiding structural failure in engineering.

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Mechanical behaviour of micro-capsules and their rupture under compression

Cited by 55 publications

References 34 publications

Comparative Study on Different Drying Methods of Fish Oil Microcapsules

Comparative Study on Different Drying Methods of Fish Oil Microcapsules

Mechanical Characterization of APA Microcapsules by Parallel-Plate Compression

Microcapsule‐Based Visualization Smart Sensors for Damage Detection: Principles and Applications

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