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Related Concept Videos

Radiation: Applications01:17

Radiation: Applications

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
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Conduction, Convection and Radiation: Problem Solving01:20

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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
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Thermal Stress01:09

Thermal Stress

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Masonry in Cold and Hot Weather Conditions01:21

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In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
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Frost Resistant Concrete01:29

Frost Resistant Concrete

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Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
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Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
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Durable radiative cooling against environmental aging.

Jianing Song1, Wenluan Zhang2,3, Zhengnan Sun1

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, China.

Nature Communications
|August 16, 2022
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Summary
This summary is machine-generated.

This study presents an anti-aging cooling paint using titanium dioxide nanoparticles. The paint maintains high solar reflectance and anti-soiling properties, offering durable radiative cooling solutions for global warming mitigation.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Subambient daytime radiative cooling is crucial for sustainable development and combating global warming.
  • High solar reflectance is essential for effective radiative cooling but is often degraded by environmental factors like soiling and UV exposure.
  • Polymer degradation, leading to yellowing, reduces the effectiveness of conventional cooling coatings.

Purpose of the Study:

  • To develop an anti-aging radiative cooling paint with persistent high solar reflectance and anti-soiling capabilities.
  • To overcome the limitations of current cooling technologies susceptible to environmental degradation.
  • To create a scalable and durable radiative cooling solution for real-world applications.

Main Methods:

  • Utilized titanium dioxide (TiO2) nanoparticles, known for UV resistance.
  • Employed evaporation-driven assembly to create a hierarchical porous morphology.
  • Formulated an anti-aging cooling paint coating.
  • Conducted accelerated weathering tests simulating 3 years of soiling and 1 year of sunshine.
  • Performed 6-month real-world aging tests.

Main Results:

  • The developed cooling paint demonstrated balanced anti-soiling and high solar reflectance.
  • Accelerated weathering tests showed minimal decline in solar reflectance (0.4% and 0.5%).
  • Real-world aging over 6 months showed negligible degradation in cooling performance.
  • The paint is scalable and suitable for spray coating on outdoor surfaces.

Conclusions:

  • The novel TiO2-based cooling paint offers a durable and effective solution against environmental aging.
  • This technology presents a promising, scalable approach for long-term radiative cooling applications.
  • The anti-aging properties ensure sustained performance, contributing to sustainable cooling strategies.