Dynamic electrochromism for all-season radiative thermoregulation

Sui, Chenxi; Pu, Jiankun; Chen, Ting-Hsuan; Liang, Jiawei; Lai, Yi‐Ting; Rao, Yunfei; Wu, Ronghui; Han, Yu; Wang, Keyu; Li, Xiuqiang; Viswanathan, Venkatasubramanian; Hsu, Po‐Chun

doi:10.1038/s41893-022-01023-2

Cited by 99 publications

(31 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…15a and b). 175 The large emissivity contrast can be maintained for 1000 cycles with only 21% degradation after 1800 cycles. Building energy simulations show that the EC device as building envelopes can save on year-round operational ventilation and air-conditioning (HVAC) energy consumption across the United States by up to 43.1 MBtu on average in specific zones.…”

Section: Thermal Comfortmentioning

confidence: 99%

Wearable electrochromic materials and devices: from visible to infrared modulation

et al. 2023

View full text Add to dashboard Cite

show abstract

Section: Thermal Comfortmentioning

confidence: 99%

Wearable electrochromic materials and devices: from visible to infrared modulation

et al. 2023

View full text Add to dashboard Cite

show abstract

“…[30] Nevertheless, these advanced radiative cooling materials are confronted with at least one of the following restraints: (1) expensive and time-consuming processes; (2) limitation in scalable fabrication; (3) inadequate optical modulation ability; (4) requirement of additional energy cost. [7,[31][32] Nanocellulose is a promising candidate for radiative cooling materials due to its high natural abundance, low cost, sustainable characteristics, and chemical uniqueness, and can be divided into three major classes: cellulose nanocrystals, cellulose nanofibrils, and bacterial cellulose (BC). [33][34][35][36][37] Among these nanocellulose materials, BC is known as pure cellulose with a 3D interconnected nanofibrous network that could be produced by bacteria such as Acetobacter, Rhizobium, and Gluconacetobacter.…”

Section: Background and Originality Contentmentioning

confidence: 99%

“…[ 30 ] Nevertheless, these advanced radiative cooling materials are confronted with at least one of the following restraints: (1) expensive and time‐consuming processes; (2) limitation in scalable fabrication; (3) inadequate optical modulation ability; (4) requirement of additional energy cost. [ 7,31‐32 ]…”

Section: Background and Originality Contentmentioning

confidence: 99%

Bacterial Cellulose‐Based Janus Films with Radiative Cooling and Solar Heating Properties for All‐Season Thermal Management^†

et al. 2023

View full text Add to dashboard Cite

Comprehensive SummaryAdvanced radiative cooling materials with both heating and cooling mode is of pivotal importance for all‐season energy‐saving in buildings. In this work, we report the design and fabrication of bacterial cellulose‐based Janus films (J‐BC) with radiative cooling and solar heating properties, which were developed by two‐step vacuum‐assisted filtration of modified MXene‐doped bacterial cellulose and modified silicon nitride (Si3N4)‐doped bacterial cellulose, followed by hot‐pressing and drying treatments. The as‐prepared J‐BC films show a unique Janus structure where modified MXene nanosheets and cellulose nanofibers are on the bottom surface, and modified silicon nitride (Si3N4) nanoparticles and cellulose nanofibers are on the top surface. The radiative cooling effect of J‐BC films is enabled by the Si3N4‐doped bacterial cellulose due to the high mid‐infrared emissivity of Si3N4 nanoparticles, which shows a high solar reflection of ~98.1% and high emissivity of ~93.6% in the atmospheric transparency window (8—13 μm). Thanks to the enhanced photothermal conversion of the modified MXene nanosheets, a reduced solar reflection (6.6%) and relatively low thermal emissivity in the atmospheric window (71.4%) are achieved, making sure the solar heating effect of J‐BC films. In the outdoor tests, J‐BC films achieve a sub‐ambient temperature drop of ~3.8 °C and an above‐ambient temperature rise of ~14.2 °C. Numerical prediction demonstrated that the J‐BC films with dual modes have great potential of all‐season energy saving for buildings and a corresponding energy‐saving map in China is also created. The work disclosed herein can provide an avenue for the shaping of advanced radiative cooling materials for emerging applications of personal thermal management, sustainable energy‐efficient buildings, and beyond.

show abstract

Section: Introductionmentioning

confidence: 99%

“…[6] However, conventional textiles have limited capabilities in terms of heat regulation, only allowing individuals to tolerate a narrow range of temperatures. Thus, the development of net-zero energy textiles is desired to dynamically adjust their thermal management properties base on the environmental conditions and the wearer's preference [7,8] The human body employs four pathways (convection, radiation, conduction and evaporation) to maintain a stable body temperature (core temperature range of 2-5 °C). [9][10][11] Based on these four pathways for heat dissipation, numerous personal thermal management technologies have been developed to expand the thermal comfort zone of the human body.…”

mentioning

confidence: 99%

Asymmetrical Emissivity and Wettability in Stitching Treble Weave Metafabric for Synchronous Personal Thermal‐Moisture Management

Fan

et al. 2023

Small

View full text Add to dashboard Cite

Developing textiles with passive thermal management is an effective strategy to maintain the human body healthy as well as decrease energy consumption. Personal thermal management (PTM) textiles with engineered constituent element and fabric structure have been developed, however the comfortability and robustness of these textiles remains a challenge due to the complexity of passive thermal‐moisture management. Here a metafabric with asymmetrical stitching treble weave based on woven structure design and yarn functionalization is developed, in which the thermal radiation regulation and moisture‐wicking can be achieved simultaneously throughout the dual‐mode metafabric due to its optically regulated property, multi‐branched through‐porous structure and surface wetting difference. With simply flipping, the metafabric enables high solar reflectivity (87.6%) and IR emissivity (94%) in the cooling mode, and a low IR emissivity of 41.3% in the heating mode. When overheating and sweating, the cooling capacity reaches to ≈9 °C owing to the synergistic effect of radiation and evaporation. Moreover, the tensile strengths of the metafabric are 46.18 MPa (warp direction) and 37.59 MPa (weft direction), respectively. This work provides a facile strategy to fabricate multi‐functional integrated metafabrics with much flexibility and thus has great potential for thermal management applications and sustainable energy.

show abstract

Dynamic electrochromism for all-season radiative thermoregulation

Cited by 99 publications

References 45 publications

Wearable electrochromic materials and devices: from visible to infrared modulation

Wearable electrochromic materials and devices: from visible to infrared modulation

Bacterial Cellulose‐Based Janus Films with Radiative Cooling and Solar Heating Properties for All‐Season Thermal Management^†

Asymmetrical Emissivity and Wettability in Stitching Treble Weave Metafabric for Synchronous Personal Thermal‐Moisture Management

Contact Info

Product

Resources

About

Dynamic electrochromism for all-season radiative thermoregulation

Cited by 99 publications

References 45 publications

Wearable electrochromic materials and devices: from visible to infrared modulation

Wearable electrochromic materials and devices: from visible to infrared modulation

Bacterial Cellulose‐Based Janus Films with Radiative Cooling and Solar Heating Properties for All‐Season Thermal Management†

Asymmetrical Emissivity and Wettability in Stitching Treble Weave Metafabric for Synchronous Personal Thermal‐Moisture Management

Contact Info

Product

Resources

About

Bacterial Cellulose‐Based Janus Films with Radiative Cooling and Solar Heating Properties for All‐Season Thermal Management^†