A macromolecular assembly directed ceramic aerogel monolith material

Yang, R.; Wang, Jieyu; An, Lu; Petit, Donald; Armstrong, Jason N.; Liu, Yuzi; Huang, Yulong; Hu, Yong; Shao, Zefan; Ren, Shenqiang

doi:10.1039/d0tc02481c

Cited by 7 publications

(4 citation statements)

References 37 publications

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“…The first batch was added and followed by blending for 3 h, then the second batch was added and also blended for 3 h. Sequentially adding the HPMC will help it to be thoroughly dissolved into the suspension, whereas directly adding the entire batch will cause HPMC to tangle together and makes the ink difficult to blend. Finally, CTAB (VWR, Radnor, PA) was added as the surfactant to form uniformly distributed gaseous bubbles, which will be developed into the porous structure after printing [25][26][27]. Unlike the conventional way to make printable ink, where a defoamer-like chemical such as 1-Octanol is added to make smooth and continuous paste (slurry) [28,29], the proposed approach in this work took the opposite route by adding a foaming agent to generate the pore-supporting porous structure.…”

Section: Methodsmentioning

confidence: 99%

Cost-Effective Additive Manufacturing of Ambient Pressure-Dried Silica Aerogel

Guo

Yang

Wang

et al. 2020

Journal of Manufacturing Science and Engineering

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The conventional manufacturing processes of aerogel insulation material is largely relying on the supercritical drying, which suffers from issues of massive energy consumption, high-cost equipment, and prolonged processing time. With the consideration of large market demand of the aerogel insulation material in the next decade, a low-cost and scalable fabrication technique is highly desired. In this paper, a direct ink writing (DIW) method is used to three-dimensionally fabricate the silica aerogel insulation material, followed by room-temperature and ambient pressure drying. Compared to the supercritical drying and freeze-drying, the reported method significantly reduces the fabrication time and costs. The cost-effective DIW technique offers the capability to print complex hollow internal structures, coupled with the porous structure, is found to be beneficial to the thermal insulation property. The addition of fiber to the ink assures the durability of the fabricated product, without sacrificing the thermal insulation performance. The foam ink preparation methods and the printability are demonstrated in this paper, along with the printing of complex three-dimensional geometries. The thermal insulation performance of the printed objects is characterized, and the mechanical properties are also examined. The proposed approach is found to have 56% reduction in the processing time. The printed silica aerogels exhibit a low thermal conductivity of 0.053 W m−1 K−1.

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Section: Methodsmentioning

confidence: 99%

Cost-Effective Additive Manufacturing of Ambient Pressure-Dried Silica Aerogel

Guo

Yang

Wang

et al. 2020

Journal of Manufacturing Science and Engineering

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“…Another benefit of including CTAB during synthesis of silica aerogels is the decrease of the extent phase separation that would result from using precursors from the siloxane groups and water as solvent, with the surfactant being accountable for promoting miscibility of water and the organic components present, therefore overcoming the strong hydrophobicity of the siloxane networks 25 . On the other hand, surfactant induced selfassembly has been reported to adequately control the morphology of porous nanostructures in aerogels, which, in turn, regulates their thermal insulation performance 26 .…”

Section: Introductionmentioning

confidence: 99%

“…25 On the other hand, surfactant induced self-assembly has been reported to adequately control the morphology of porous nanostructures in aerogels, which, in turn, regulates their thermal insulation performance. 26 The improvement of the mechanical properties of aerogels ranges from the development of aerogel-like monoliths by different methods such as (i) cross-linking the aerogel particles with polymer cross-linkers of the triacrylate family, 27 (ii) the use of a coprecursor approach 28,29 as a way to control the cross-linking density -and hence flexibility of the resulting aerogel, and (iii) the use of silica aerogels as unique nanostructured fillers for epoxy nanocomposites. 30 Another commonly applied technique incorporates a fiber matrix in the preparation of fiber/aerogel composite products.…”

Section: Introductionmentioning

confidence: 99%

Scalable and robust silica aerogel materials from ambient pressure drying

Luigi

Armstrong

et al. 2022

Mater. Adv.

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“…However, their sound‐absorption coefficients were poor in low‐frequency region. [ 13–17 ] For example, Huang et al. prepared a nonwoven composite board by multiple‐needle punching and thermal bonding techniques.…”

Section: Introductionmentioning

confidence: 99%

Lightweight Low‐Frequency Sound‐Absorbing Composites of Graphene Network Reinforced by Honeycomb Structure

Zhang

Wang

et al. 2021

Adv Materials Inter

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Efficient, facile, lightweight, and low‐frequency sound‐absorbing materials are in great demand for noise elimination and insulation. However, the applications of some candidate materials are limited by their large space, mass, or unsatisfactory sound‐absorption performance especially in low‐frequency sound‐wave region. Graphene network structure can be promising sound‐absorbing materials due to ultrahigh porosity, ultralight weight, and excellent intrinsic properties. Conventionally, allowing for poor mechanical strength, such graphene materials are needed to be reinforced by polymer, metal, or ceramic. Here, a novel strategy of graphene network reinforced by honeycomb structure is proposed, in which graphene is used as a sound absorber, and meanwhile flexible aramid honeycomb is introduced to enhance the graphene composite. In this work, the compressive strength of graphene network structure is improved 1000 times by the flexible aramid honeycomb, and meanwhile the density is only increased 2.5 times. Moreover, the sound‐absorption coefficient of graphene network is about 0.9 at 700 Hz for the thickness of 30 mm. Further, the sound‐absorption coefficient is above 0.9 in the frequency range of >1000 Hz. Therefore, the graphene composite is expected to be saving space and weight for the engineering design of sound absorbers in low‐frequency regions.

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A macromolecular assembly directed ceramic aerogel monolith material

Abstract:
A macromolecular assembly induced transparent and opaque ceramic aerogel material.

Cited by 7 publications

References 37 publications

Cost-Effective Additive Manufacturing of Ambient Pressure-Dried Silica Aerogel

Cost-Effective Additive Manufacturing of Ambient Pressure-Dried Silica Aerogel

Scalable and robust silica aerogel materials from ambient pressure drying

Lightweight Low‐Frequency Sound‐Absorbing Composites of Graphene Network Reinforced by Honeycomb Structure

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A macromolecular assembly directed ceramic aerogel monolith material

Abstract: A macromolecular assembly induced transparent and opaque ceramic aerogel material.

Cited by 7 publications

References 37 publications

Cost-Effective Additive Manufacturing of Ambient Pressure-Dried Silica Aerogel

Cost-Effective Additive Manufacturing of Ambient Pressure-Dried Silica Aerogel

Scalable and robust silica aerogel materials from ambient pressure drying

Lightweight Low‐Frequency Sound‐Absorbing Composites of Graphene Network Reinforced by Honeycomb Structure

Contact Info

Product

Resources

About

Abstract:
A macromolecular assembly induced transparent and opaque ceramic aerogel material.