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Updated: Jun 25, 2025

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors

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Published on: November 15, 2016

Humidity-tolerant porous polymer coating for passive daytime radiative cooling.

Dongpyo Hong¹, Yong Joon Lee², Ok Sung Jeon¹

¹Advanced Institute of Convergence Technology, Seoul National University, Suwon-si, Gyeonggi-do, 16229, Republic of Korea.

Nature Communications

|May 25, 2024

Summary

Adding polymer reinforcement to porous polymer coatings (PPC) enhances passive daytime radiative cooling (PDRC) paint performance under humid conditions. This innovation addresses a key challenge for developing reliable PDRC paint for widespread use.

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Area of Science:

Materials Science
Building Science
Sustainable Energy

Background:

Passive daytime radiative cooling (PDRC) offers energy-efficient cooling for buildings.
Porous polymer coatings (PPC) show promise for PDRC paint due to performance and scalability.
Commercialization of PDRC paint is hindered by inconsistent performance in varying drying environments.

Purpose of the Study:

To investigate the impact of humidity on PPC performance during drying.
To develop a strategy to improve the humidity resilience of PDRC paint.
To enhance the reliability and applicability of PDRC paint for building envelopes.

Main Methods:

Characterization of PPC solar reflectance under different relative humidity (RH) levels.
Introduction of polymer reinforcement into PPC formulations.
Evaluation of PDRC performance of modified PPC under humid drying conditions.

Main Results:

PPC's solar reflectance significantly decreases with increasing humidity above 30% RH.
PPC loses PDRC ability at 45% RH and acts as a solar-heating material at higher humidity.
Polymer-reinforced PPC maintains PDRC performance up to 60% RH, improving potential areal coverage by 950%.

Conclusions:

Humidity during drying is a critical vulnerability for PPC-based PDRC paint.
Polymer reinforcement effectively mitigates humidity-induced performance degradation.
This strategy provides engineering guidance for developing dependable PDRC paint for industrial applications.