Functional Gradient Inverse Opal Carbon Monoliths with Directional and Multinary Porosity

Chen, Mengdi; Hagedorn, Kay; Cölfen, Helmut; Polarz, Sebastian

doi:10.1002/adma.201603356

Cited by 20 publications

(25 citation statements)

References 37 publications

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“…The centrifugation with the direction of centrifugal force along the height of microholes was then applied to the CaCO 3 NPs/PDMS‐composite‐filled PU template by the using of swing‐bucket centrifuge rotor. [ 32 ]…”

Section: Resultsmentioning

confidence: 99%

Adhesion Enhancement of Micropillar Array by Combining the Adhesive Design from Gecko and Tree Frog

Quan

Tan

Meng

et al. 2020

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It has long been demonstrated the gecko‐inspired micropillar array with T‐shape tips possesses the best adhesion performance of a given material. The further enhancement of the adhesion performances of T‐shape micropillars can offer redundant adhesion to compensate for the inevitable improper contacts. Here, the array of T‐shape polydimethylsiloxane (PDMS) micropillars is incorporated with gradient dispersed calcium carbonate nanoparticles in the micropillar stalk, termed as T‐shape gradient micropillars (TG), possessing the modulus gradient with stiff tip and soft root. The gradient modulus in TG facilitates the contact formation and regulates the stress at the detaching interface, resulting in a 4.6 times adhesion and 2.4 times friction as compared with the pure PDMS T‐shape micropillar arrays. The study here provides a new design strategy for the super‐strong structured dry adhesives.

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Section: Resultsmentioning

confidence: 99%

Adhesion Enhancement of Micropillar Array by Combining the Adhesive Design from Gecko and Tree Frog

Quan

Tan

Meng

et al. 2020

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“…A centrifugation approach was used to build crack‐free gradient porous carbon materials. Polystyrene spheres with three different sizes were used as templates with a resorcinol‐formaldehyde sol . Materials with bimodal and trimodal porosity (Figure ) were produced.…”

Section: Production Of Gradient Materialsmentioning

confidence: 99%

“…Ac entrifugation approachw as used to build crack-free gradientp orousc arbon materials.P olystyrene spheres with three different sizes were used as templates with ar esorcinol-formaldehyde sol. [46] Materials with bimodal and trimodal porosity ( Figure 5) were produced.A reas with different porosity can be clearly seen in the scanninge lectron microscopy micrographs.I tw as shown that the performance of a Li-O 2 cell is heavilyi nfluenced by the porous structure.…”

Section: Production Of Gradient Materialsmentioning

confidence: 99%

Putting a New Spin on It: Gradient Centrifugation for Analytical and Preparative Applications

Spinnrock

Cölfen

2019

Chemistry A European J

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Gradient centrifugation is an important technique in chemistry, biology, materials science and engineering. It has big potential beyond the well‐known centrifugation for separation of molecules and particles. Various possibilities for special analysis and separation of particles, but also preparative applications like the production of gradient materials and controlled polymerizations exist. In all examples, a gradient of physical and/or chemical properties is generated by centrifugation and used for the further application. In this Concept article, selected examples of gradient centrifugation are presented, to show important developments in the field and discuss their applications, potential, and limitations. It concludes by analysing future trends of gradient centrifugation that are relevant for academic and industrial usage.

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“…At lower rotational speeds, sedimentation and diffusion are in equilibrium and exponential concentration gradients are generated (sedimentation equilibrium experiments). The behavior of nanoparticles in the AUC is well‐known …”

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Nanoparticle Gradient Materials by Centrifugation

Spinnrock

Schupp

Cölfen

2018

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graded carbon nanocomposites, [14,15] magnetic particle gradients, [16,17] and metal nanoparticle gradients at surfaces. [18] Established preparation methods for poly meric gradient composites like centrifugal casting, [19] corona discharge, [20] photopolymerization, [21] selective laser sintering, [22,23] and 3D printing [24] lack the possibility to simulate the gradients in advance and/or to detect the nanoparticle concentration gradient during processing. Also, 3D printing leads to step and no continuous gradients.In contrast, we use analytical ultracentrifugation (AUC), a classical technique for polymer and colloid analytics, to fabricate a desired concentration gradient of nanoparticles in a gelatin matrix. The concentration gradient can be simulated in advance with the well-established thermodynamic theory of AUC [25] and detected any time by optical detection systems (interference and absorption). Depending www.advancedsciencenews.com

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Functional Gradient Inverse Opal Carbon Monoliths with Directional and Multinary Porosity

Abstract: Nanoporous monoliths with hierarchical nanostructure are prepared via in situ assembly of template and carbon precursor gel by controlled ultracentrifugation experiments. Benefits of the gradient porosity are demonstrated for the Li-O battery.

Cited by 20 publications

References 37 publications

Adhesion Enhancement of Micropillar Array by Combining the Adhesive Design from Gecko and Tree Frog

Adhesion Enhancement of Micropillar Array by Combining the Adhesive Design from Gecko and Tree Frog

Putting a New Spin on It: Gradient Centrifugation for Analytical and Preparative Applications

Nanoparticle Gradient Materials by Centrifugation

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