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Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Accelerated Curing of Concrete

Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
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Additives and Fillers in Concrete

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Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Updated: Jul 7, 2026

Encapsulation and Permeability Characteristics of Plasma Polymerized Hollow Particles
09:27

Encapsulation and Permeability Characteristics of Plasma Polymerized Hollow Particles

Published on: August 16, 2012

Janus Particles Stabilized Passive Cooling Porous Composites.

Xingmei He1,2,3, Chao Jiang2, Yingchun Long1,2

  • 1Department of Chemistry, Capital Normal University, Beijing, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 6, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel passive radiative cooling material using a porous composite. This material offers efficient cooling and thermal buffering, overcoming limitations of conventional static coolers.

Keywords:
Janus particlesphase change materialsporous compositesradiative coolingthermal management

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A System to Create Stable Nanoparticle Aerosols from Nanopowders
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermodynamics

Background:

  • Passive radiative cooling offers a sustainable solution for refrigeration and energy challenges.
  • Conventional radiative coolers face performance limitations due to thermal shock and heat accumulation.
  • Developing adaptive materials is crucial for real-world thermal management applications.

Purpose of the Study:

  • To fabricate an intelligent passive radiative cooling material with enhanced radiative thermal dissipation and dynamic thermal buffering.
  • To address the limitations of static cooling properties in conventional radiative coolers.
  • To create a scalable and efficient material for adaptive thermal management.

Main Methods:

  • A scalable one-pot strategy was employed to fabricate a ternary PMMA/LA/BN porous composite.
  • An inverse Pickering emulsion template stabilized by amphiphilic Janus particles was utilized.
  • The composite structure was engineered to incorporate boron nitride (BN) nanosheets and lauric acid (LA) as a phase change material.

Main Results:

  • The fabricated porous composite achieved high solar reflectivity (95.1%) and atmospheric window emissivity (96.5%).
  • The material demonstrated efficient radiative cooling combined with dynamic thermal buffering capabilities.
  • Incorporation of lauric acid effectively mitigated thermal fluctuations and provided thermal shock resistance.

Conclusions:

  • The developed porous composite offers a synergistic approach to radiative cooling and phase change thermal buffering.
  • This material presents a viable strategy for creating adaptive thermal management solutions for complex environments.
  • The scalable fabrication method enables potential for practical applications in passive cooling technologies.