Multifunctional Silica Nanotube Aerogels Inspired by Polar Bear Hair for Light Management and Thermal Insulation

Du, Ai; Wang, Hongqiang; Zhou, Bin; Zhang, Chen; Wu, Xueling; Ge, Yingting; Niu, Tingting; Ji, Xiujie; Zhang, Ting; Zhang, Zhihua; Wu, Guangming; Shen, Jun

doi:10.1021/acs.chemmater.8b02926

Cited by 145 publications

(92 citation statements)

References 44 publications

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“…Ceramic aerogels based on SiO 2 , [ 74 ] Al 2 O 3 , [ 75 ] SiC, [ 76 ] and BN [ 77 ] have been widely investigated due to their light weight, low thermal conductivity, high refractoriness, and corrosion resistance. As a well‐known example, thermal insulation systems of extraordinarily high performance have been achieved on the basis of silica aerogels and emerging as the first significantly commercialized aerogel materials.…”

Section: Recent Trends In Freeze‐casting Materialsmentioning

confidence: 99%

Freeze Casting: From Low‐Dimensional Building Blocks to Aligned Porous Structures—A Review of Novel Materials, Methods, and Applications

2020

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Freeze casting, also known as ice templating, is a particularly versatile technique that has been applied extensively for the fabrication of well‐controlled biomimetic porous materials based on ceramics, metals, polymers, biomacromolecules, and carbon nanomaterials, endowing them with novel properties and broadening their applicability. The principles of different directional freeze‐casting processes are described and the relationships between processing and structure are examined. Recent progress in freeze‐casting assisted assembly of low dimensional building blocks, including graphene and carbon nanotubes, into tailored micro‐ and macrostructures is then summarized. Emerging trends relating to novel materials as building blocks and novel freeze‐cast geometries—beads, fibers, films, complex macrostructures, and nacre‐mimetic composites—are presented. Thereafter, the means by which aligned porous structures and nacre mimetic materials obtainable through recently developed freeze‐casting techniques and low‐dimensional building blocks can facilitate material functionality across multiple fields of application, including energy storage and conversion, environmental remediation, thermal management, and smart materials, are discussed.

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Section: Recent Trends In Freeze‐casting Materialsmentioning

confidence: 99%

Freeze Casting: From Low‐Dimensional Building Blocks to Aligned Porous Structures—A Review of Novel Materials, Methods, and Applications

2020

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“…Kistler first presented the composition of aerogels including oxides of silicon, aluminum, tin, thorium, iron, tungsten and organic compounds such as cellulose, cellulose nitrate, and gelatin [5,6]. For a long time, as a representative of inorganic aerogels, silica aerogels have been widely studied and applied because of their low cost and good structure and properties [7,8]. In the field of biomedicine, previous studies have shown the diffusion mechanism of drugs in silica aerogels [9,10], and that silica nanoparticle-loaded drugs have had good targeted therapeutic effects on diseases [11,12].…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization, and In Vitro Evaluation of Resveratrol-Loaded Cellulose Aerogel

Qin

Zhao

et al. 2020

Materials

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Resveratrol is a natural active ingredient found in plants, which is a polyphenolic compound and has a variety of pharmaceutical uses. Resveratrol-loaded TEMPO-oxidized cellulose aerogel (RLTA) was prepared using a freeze-drying method, employing high speed homogenization followed by rapid freezing with liquid nitrogen. RLTAs were designed at varying drug–cellulose aerogel ratios (1:2, 2:3, 3:2, and 2:1). It could be seen via scanning electron microscopy (SEM) that Res integrated into TEMPO-oxidized cellulose (TC) at different ratios, which changed its aggregation state and turned it into a short rod-like structure. Fourier transform infrared (FTIR) spectra confirmed that the RLTAs had the characteristic peaks of TC and Res. In addition, X-ray diffraction (XRD) demonstrated that the grain size of RLTA was obviously smaller than that of pure Res. RLTAs also had excellent stability in both simulated gastric fluid and phosphate buffer solution. The drug release rate was initially completed within 5 h under a loading rate of 30.7 wt%. The results of an MTT assay showed the low toxicity and good biocompatibility of the RLTAs. TC aerogel could be a promising drug carrier that may be widely used in designing and preparing novel biomedicine.

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“…Through evolution over millions of years, elaborate biophotonic microstructures existing in creatures have been fascinating tools to efficiently control the light propagation, leading to tremendous advances in design of modern biomimetic materials and devices . Structural whiteness (i.e., broadband reflection) is one of the intriguing phenomena, which prevalently appears in insects, aquatic organisms, mammals, and avifaunae, providing ponderable ideas for applications ranging from displays to energy‐efficient thermal controlled materials and devices . Derived from the correlation between intensity of reflection light and viewing or incident angles, structural whiteness can be divided into two types, diffuse whiteness (angle independent) and metallic silver (angle dependent).…”

Section: Introductionmentioning

confidence: 99%

Bright Silver Brilliancy from Irregular Microstructures in Butterfly Curetis acuta Moore

Liu

Wang

Yang

et al. 2019

Advanced Optical Materials

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Structural whiteness in nature is one of the useful optical phenomena contributed by refined microstructures and serves important biological functions. However, whiteness residing in wings, antennae, and bodies of butterflies often draws less attention, with undetected physical mechanisms and applications. Here, it is discovered that bright silver scales on the ventral side of butterfly Curetis acuta Moore have enhanced broadband reflection with particular angle dependency, which is dominated by the irregularity of scales. The broadband reflection is the result of color mixing effect caused by laminated scales with irregular layer space and thickness. The special angle dependency suggests that the reflection intensity changes with azimuth angles but remains unvaried at different viewing angles along given direction. This is the consequence of diffraction caused by ridges and irregular holes on the scales, which generates the shining effect and extends the viewing angle of broadband reflection. The characteristic reflection property is speculated to be used for intraspecific communication. Furthermore, it is found that the broadband reflection property of the silver scales is helpful to lower the body temperature under direct sunshine. These findings for light and thermo controlling would offer a potential strategy to design bioinspired advanced materials for low‐energy, reflectance‐based applications.

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Multifunctional Silica Nanotube Aerogels Inspired by Polar Bear Hair for Light Management and Thermal Insulation

Cited by 145 publications

References 44 publications

Freeze Casting: From Low‐Dimensional Building Blocks to Aligned Porous Structures—A Review of Novel Materials, Methods, and Applications

Freeze Casting: From Low‐Dimensional Building Blocks to Aligned Porous Structures—A Review of Novel Materials, Methods, and Applications

Preparation, Characterization, and In Vitro Evaluation of Resveratrol-Loaded Cellulose Aerogel

Bright Silver Brilliancy from Irregular Microstructures in Butterfly Curetis acuta Moore

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