Fabrication and mechanical properties of microchambers made of polyelectrolyte multilayers

Kiryukhin, Maxim V.; Man, Shu Mei; Gorelik, Sergey; Subramanian, Gomathy Sandhya; Low, Hong Yee; Sukhorukov, Gleb B.

doi:10.1039/c1sm05101f

Cited by 37 publications

(55 citation statements)

References 61 publications

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“…We focus in this section on the second buckling, hence considering only deflations where wrinkles appear on an already existing axisymmetric conformation. This term does not vanish at ∆V V = 0 because c * 0 = c 0 ; in the total elastic energy, it is counterbalanced by the cst and the effective surface term expressed by γ ef f in equation (6). Effective surface energy (not represented here) varies at maximum by −0.33 κ , and on an amplitude 0.03 κ in the nonspherical conformations.…”

Section: Location Of the Transitionmentioning

confidence: 99%

“…Such a systematic and quantitative study will help deciphering conformations observed in e.g. Soft Matter (lock-and-key colloids [1], multiwall capsules [2], particles design through evaporation [3,4]), galenics (encapsulation [5]), microfluidics (microtanks [6]) or medicine (ultrasound contrast agents [7]), under the action of an external pressure or other possibly isotropic fields such as concentration in evaporation/dissolution phenomena, which also shapes objects in Nature [8].…”

Section: Introductionmentioning

confidence: 99%

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Numerical deflation of beach balls with various Poisson’s ratios: From sphere to bowl’s shape

Quilliet

2012

Eur. Phys. J. E

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We present a numerical study of the shape taken by a spherical elastic surface when the volume it encloses is decreased. For the range of 2D parameters where such a surface may model a thin shell of an isotropic elastic material, the mode of deformation that develops a single depression is investigated in detail. It occurs via buckling from sphere toward an axisymmetric dimple, followed by a second buckling where the depression loses its axisymmetry through folding along portions of meridians. For the thinnest shells, a direct transition from the spherical conformation to the folded one can be observed. We could exhibit unifying master curves for the relative volume variation at which first and second buckling occur, and clarify the role of the Poisson's ratio. In the folded conformation, the number of folds and inner pressure are investigated, allowing us to infer shell features from mere observation and/or knowledge of external constraints.

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Section: Location Of the Transitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical deflation of beach balls with various Poisson’s ratios: From sphere to bowl’s shape

Quilliet

2012

Eur. Phys. J. E

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“…Due to different adhesive forces between PEM-PDMS and PEM-silica (or glass slide) substrate, the PEM microchambers are transferred to the substrate with higher surface energy (for printing results see Supplementary Information Fig. S1 and refs 10,17 and 28). …”

Section: Resultsmentioning

confidence: 99%

“…Such coatings are now commonly produced utilizing Layer-by-Layer (LbL) self-assembly methods via either the time consuming dip-coating910 or less time but more solvent consuming spraying approach11. Due to their stimuli responsiveness and simplicity of productions, such PEM coatings are used in a variety of applications, especially in the field of surface mediated drug delivery, antibiofouling or implants1213.…”

mentioning

confidence: 99%

Patterned Microstructure Fabrication: Polyelectrolyte Complexes vs Polyelectrolyte Multilayers

Gai

Frueh

Kudryavtseva

et al. 2016

Sci Rep

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Polyelectrolyte complexes (PEC) are formed by mixing the solutions of oppositely charged polyelectrolytes, which were hitherto deemed “impossible” to process, since they are infusible and brittle when dry. Here, we describe the process of fabricating free-standing micro-patterned PEC films containing array of hollow or filled microchambers by one-step casting with small applied pressure and a PDMS mould. These structures are compared with polyelectrolyte multilayers (PEM) thin films having array of hollow microchambers produced from a layer-by-layer self-assembly of the same polyelectrolytes on the same PDMS moulds. PEM microchambers “cap” and “wall” thickness depend on the number of PEM bilayers, while the “cap” and “wall” of the PEC microchambers can be tuned by varying the applied pressure and the type of patterned mould. The proposed PEC production process omits layering approaches currently employed for PEMs, reducing the production time from ~2 days down to 2 hours. The error-free structured PEC area was found to be significantly larger compared to the currently-employed microcontact printing for PEMs. The sensitivity of PEC chambers towards aqueous environments was found to be higher compared to those composed of PEM.

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“…application of nanopores to study lipid properties) from which these carriers are made. adsorption [16][17][18]. Development of microcapsules of different shapes may be important for bio-applications [19], anisotropicity [20][21][22][23][24] plays a significant role: elliptical particles [25] with controllable loading [26].…”

Section: Introductionmentioning

confidence: 99%

Pharmacological aspects of release from microcapsules — from polymeric multilayers to lipid membranes

Wuytens

Parakhonskiy

Yashchenok

et al. 2014

Current Opinion in Pharmacology

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Fabrication and mechanical properties of microchambers made of polyelectrolyte multilayers

Cited by 37 publications

References 61 publications

Numerical deflation of beach balls with various Poisson’s ratios: From sphere to bowl’s shape

Numerical deflation of beach balls with various Poisson’s ratios: From sphere to bowl’s shape

Patterned Microstructure Fabrication: Polyelectrolyte Complexes vs Polyelectrolyte Multilayers

Pharmacological aspects of release from microcapsules — from polymeric multilayers to lipid membranes

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