Hydroxypropyl Cellulose‐Based Thermochromic Hydrogels for Smart Passive Cooling DOI Open Access
Jing Wang, Lei Yue,

Haneena Neermunda Jaleel

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Abstract Solar heating through windows significantly increases thermal loads in buildings, vehicles, and greenhouses. In particular, overheating parked vehicles under direct sunlight poses serious safety risks, with numerous reports linking high interior temperatures to heat‐related fatalities among children pets. To address this challenge, a durable thermochromic hydrogel dual‐network structure of hydroxypropyl cellulose (HPC) polyacrylamide (PAAM), enhanced by calcium chloride (CaCl 2 ) for tunable transition temperature is developed. Through ion chelation hydrogen bonding, the transitions between transparent opaque states across wide range (15–42 °C), adapting various environments. Encapsulated acrylic sheets as smart windows, achieves passive cooling, reducing vehicle up 10 °C sunlight. The material also exhibits excellent mechanical strength, water retention, long‐term stability (400 cycles), ensuring real‐world reliability. These results demonstrate hydrogel's potential scalable applications sustainable building facades, greenhouse coverings, offering an energy‐efficient, eco‐friendly solution management. Unlike existing technologies requiring external power or complex fabrication, operates passively, making it cost‐effective alternative. This innovation addresses critical energy challenges while advancing next‐generation energy‐efficient materials global sustainability goals.

Language: Английский

Fast-Developing Dynamic Radiative Thermal Management: Full-Scale Fundamentals, Switching Methods, Applications, and Challenges DOI Creative Commons

Long Xie,

Xuechuan Wang,

Yageng Bai

et al.

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: Feb. 17, 2025

Abstract Rapid population growth in recent decades has intensified both the global energy crisis and challenges posed by climate change, including warming. Currently, increased frequency of extreme weather events large fluctuations ambient temperature disrupt thermal comfort negatively impact health, driving a growing dependence on cooling heating sources. Consequently, efficient management become central focus research. Traditional systems consume substantial energy, further contributing to greenhouse gas emissions. In contrast, emergent radiant technologies that rely renewable have been proposed as sustainable alternatives. However, achieving year-round without additional input remains formidable challenge. Recently, dynamic radiative emerged most promising solution, offering potential for energy-efficient adaptation across seasonal variations. This review systematically presents advancements management, covering fundamental principles, switching mechanisms, primary materials, application areas. Additionally, key hindering broader adoption are discussed. By highlighting their transformative potential, this provides insights into design industrial scalability these innovations, with ultimate aim promoting integration applications.

Language: Английский

Citations

1
Smart Hydrogel Film of Bionanocellulose/Alginate/Polyethylene Glycol/Thermochromic Dye (BNC/ALG/PEG/TD) with Thermo-Responsive Behavior DOI Creative Commons
N. F. A. Zainal, Ku Marsilla Ku Ishak, Yazmin Bustami

et al.

IntechOpen eBooks, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 7, 2025

We aim to explore bionanocellulose/alginate/polyethylene glycol/thermochromic dye (BNC/ALG/PEG/TD) as a thermo-responsive hydrogel film. In this study, BNC was produced using Pichia kudriavzevii USM-YBP2. Then, the morphology of observed transmission electron microscope (TEM). The formation film utilized ionic crosslinking technique by mixing BNC, ALG, PEG, and thermochromic (TD) with Ca2+ ions. evaluated for its swelling property, behavior, biodegradability. exhibits aggregated fiber clusters spherical shape. BNC/ALG/PEG/TD formed gray film, which indicates successful integration TD. Interestingly, it shows acceptable stability in wet dry conditions, suggesting robustness stability. However, demonstrated low water content (16.6%) compared control probably because increment crosslink density or improvement polymer-polymer interaction. changes drastically colorless at temperatures >30°C proving behavior. also presented reversible thermochromism property that enables reverse back original color morphology. slow degradation needs more than 2 weeks fully degrade. conclusion, can be potentially explored smart wide area applications.

Language: Английский

Citations

0
Bio‐Inspired Multifunctional Smart Windows: Surface Wrinkle‐Crack for Dynamic Optical and Wettability Modulations DOI Creative Commons
Qiuting Zhang, Tingting Zhu, Na Li

et al.

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 13, 2025

Abstract Smart windows are promising to promote building energy efficiency. Bio‐inspired smart expected fulfill the independent energy‐saving and on‐demand privacy modes simultaneously, while further improvement is necessary. Here, an improved composite based on tungsten‐doped vanadium dioxides (W‐VO 2 ), silica (SiO ) nanospheres, polydimethylsiloxane (PDMS) elastomers reported. It found that can simultaneously under a low temperature of ≈45 °C. More importantly, surface morphology effects investigated optical wettability modulation provide insight into SiO ‐based wrinkle formation mechanisms. demonstrated wrinkles more effective than cracks in achieving mode, indicated by diffraction patterns. Increasing also causes change from hydrophilic hydrophobic properties accompanied contact angle 19° 115°, suggesting potential for self‐cleaning functionality. SiO₂ spheres essential forming wrinkles: small gaps between nearby localized strain increase overall Young's modulus, resulting larger amplitude. Combining method understanding, this work support future developments mechano‐/thermos‐chromic materials, windows, bioinspired materials designs.

Language: Английский

Citations

0
Thermochromic Pnipam Hydrogel Filled with Hollow Polydopamine and Cellulose Nanocrystal Particles for Smart Windows with Enhanced Solar Modulation and Structural Durability DOI

Shi Shi,

Yiming Zhou, Yan Qiao

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
Hydroxypropyl Cellulose‐Based Thermochromic Hydrogels for Smart Passive Cooling DOI Open Access
Jing Wang, Lei Yue,

Haneena Neermunda Jaleel

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Abstract Solar heating through windows significantly increases thermal loads in buildings, vehicles, and greenhouses. In particular, overheating parked vehicles under direct sunlight poses serious safety risks, with numerous reports linking high interior temperatures to heat‐related fatalities among children pets. To address this challenge, a durable thermochromic hydrogel dual‐network structure of hydroxypropyl cellulose (HPC) polyacrylamide (PAAM), enhanced by calcium chloride (CaCl 2 ) for tunable transition temperature is developed. Through ion chelation hydrogen bonding, the transitions between transparent opaque states across wide range (15–42 °C), adapting various environments. Encapsulated acrylic sheets as smart windows, achieves passive cooling, reducing vehicle up 10 °C sunlight. The material also exhibits excellent mechanical strength, water retention, long‐term stability (400 cycles), ensuring real‐world reliability. These results demonstrate hydrogel's potential scalable applications sustainable building facades, greenhouse coverings, offering an energy‐efficient, eco‐friendly solution management. Unlike existing technologies requiring external power or complex fabrication, operates passively, making it cost‐effective alternative. This innovation addresses critical energy challenges while advancing next‐generation energy‐efficient materials global sustainability goals.

Language: Английский

Citations

0