Changhui Liu

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Verified

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• Doctor of Philosophy
• Professor (Associate) at China University of Mining and Technology

With the increasing demand for thermal management, phase change materials (PCMs) have garnered widespread attention due to their unique advantages in energy storage and temperature regulation. However, traditional PCMs present challenges in modification, with commonly used physical methods facing stability and compatibility issues. This study intro...

In light of the growing recognition of low-carbon initiatives, renewable energy is gradually assuming a dominant role within the energy framework. Phase change materials can enhance the efficiency of renewable energy utilization by energy peak shaving and time shifting. However, leakage and inherent rigidity signify that a significant amount of...

Uneven and insufficient encapsulation caused by surface tension between supporting and phase change materials (PCMs) can be theoretically avoided if the encapsulation process co‐occurs with the formation of supporting materials in the same environment. Herein, for the first time, a one‐pot one‐step (OPOS) protocol is developed for synthesizing TiO2...

In this work, an organic/inorganic hybrid polymer containing siloxyl functional groups was synthesized and applied to encapsulate phase change materials (PCMs). Owing to the mild conditions of the hypercrosslinking reaction, which only requires the addition of a catalytic amount of aqueous alkaline solution, both organic and inorganic PCMs are tole...

Solid-liquid phase change materials (PCMs) are highly regarded for their excellent thermal storage capabilities, making them a cornerstone in latent heat storage. However, challenges such as liquid leakage, low thermal conductivity, and limited solar photothermal conversion efficiency have restricted their broader application. In this study, we add...

Organic phase change materials (PCMs) provide great potential for zero‐energy thermal management thanks to superior thermal storage cyclability, stable phase change temperature, and low supercooling behavior. However, liquid leakage and flammability are long‐standing defects that limit their practical utilization in thermal management. Here, an int...

In response to the performance limitations of traditional heat transfer fluids under extreme conditions, a series of organic/inorganic deep eutectic solvents (DES), composed of ethylene glycol and different types of acetates, have been developed, and their downstream thermophysical properties, as well as their potential applications in nanofluids,...

Compared to solid-liquid phase change energy storage, solid-solid phase change energy storage offers better volumetric stability, thermal stability, and chemical stability. It does not require specialized encapsulation techniques to prevent leakage, thereby simplifying the design and manufacturing process of thermal energy storage (TES) systems, ma...

The mining industry produces a large amount of industrial solid waste every year. Among them, fly ash (FA), slag and tailings are the three main solid wastes, which can cause soil pollution, air pollution, water pollution and serious threat to human health if not handled properly. At present, the treatment methods of industrial solid waste mainly i...

Aiming at the demand for new energy consumption and mobile portable heat storage, a gravity heat pipe with embedded structure was designed. In order to explore the two-phase heat transfer mechanism of the embedded heat pipe, CFD numerical simulation technology was used to study the internal two-phase flow state and heat transfer process of the embe...

As the demand for comfort rises, phase change materials (PCMs) offer a transformative solution for personal thermal management by dynamically regulating body temperature through heat absorption and release. Organic PCMs are particularly noted for providing extended thermal comfort in various environments and activities within wearable technology. H...

Organic phase change cold storage materials show significant potential in various fields, including cold chain transportation, food and drug preservation, and battery thermal management. However, most organic phase change cold storage materials struggle with issues like difficult temperature control and flammability, which severely limit their a...

In response to the pressing demands for sustainable energy, the development of efficient energy storage materials and technologies has emerged as a focal point in contemporary research. Sodium acetate trihydrate (CH3COO�Na⋅3H2O, SAT), recognized for its potential as a mid-to-low temperature phase change material (PCM) in energy storage systems, enc...

The objective of this study is to prepare a highly adjustable ester phase change material (PCM) and furtheroptimize its cold storage properties using a simple and controllable physical method. Initially, lauric acid (LA)and polyethylene glycol 200 (PEG 200) are selected as raw materials, and a non-toxic and environmentallyfriendly polyethylene glyc...

As one of the most common fossil derivatives, plastics are widely used for their exceptional chemical stability, low density, and ease of processing. In recent years, there has been a significant increase in the production of waste plastics, coupled with a low recycling rate, resulting in serious environmental pollution. To enhance the use of waste...

With the increasing global demand for energy and continuous destruction of the environment, the demand for sustainable green development is becoming increasingly urgent. However, the development and renewal of new-energy...

The efficient heat transfer performance of three-dimensional pulsating heat pipes can effectively deal with the heat dissipation problems in the field of electronics integration. However, the large contact thermal resistance and complex layout limit the actual cooling efficiency. In this study, a novel three-dimensional array pulsating heat pipe (3...

Phase change materials are often limited in thermal energy storage technologies by their tendency to leak and low thermal conductivity. In the present work, a novel phase change materials for in situ encapsulation of titanium dioxide were synthesized by a one-step method based on the hydrolysis reaction of tetrabutyl titanate.The encapsulation proc...

A mixture of polyethylene glycol and stearic acid is developed to extend the working temperature range and improve the heat utilization efficiency, and composited with carbonized loofah sponge fragments using melt impregnation method to improve the thermal conductivity of solid-liquid phase change material and find a solution for its leakage issue....

The practicality of conventional solid–liquid phase change materials (PCMs) is adversely restricted by liquid phase leakage, large volume expansion, shape instability, and severe corrosion in high-temperature thermal management systems. This highlight presents the latest development to resolve these challenges by designing ultrahigh-performance hig...

Thermal storage technology based on phase change material (PCM) holds significant potential for temperature regulation and energy storage application. However, solid–liquid PCMs are often limited by leakage issues during phase changes and are not sufficiently functional to meet the demands of diverse applications. Fortunately, it has been recogn...

As one of the most common fossil derivatives, plastic is indispensable in daily life because of its promising mechanical properties, chemical stability, and easy accessibility. However, plastics still present a huge burden on the global environment due to their high production volume, difficulty with degradation and low recycling rate. At the same...

As a new type of energy transport medium with high efficiency and high heat transfer performance, nanofluids have shown broad application prospects in the fields of thermodynamics, solar heat collection, microelectronics, thermal energy, and material science. The wide liquid range and environmental properties of ionic liquids have drawn ample atten...

The concept of high energy storage density, negligible changes in volume and pressure after phase change, approximately constant operating temperature and non-toxic of solid–liquid phase change energy storage are very appealing properties that makes it a good strategy to store heat. However, leakage and single thermal energy storage function has be...

Energy depletion has become an unavoidable problem with deepening of industrialization and population ex�plosion. Solar energy has been widely used because it is regarded as the most sustainable energy resource. However, the relatively low energy density associate with its fluctuation characteristic are great challenges lying on the road of pract...

Glycerol is a bio-based low-cost chemical, which has been widely studied in the field of heat conduction because of its wide working temperature range and superior thermopysical. However, high viscosity of glycerol is a prominent problem that limit the application of glycerol. In this work, low viscosity and high thermal conductivity of glycerol na...

Despite the great potential in fabrication of biodegradable and eco-friendly air filters by electrospinning poly(lactic acid) (PLA) membranes, the filtering performance is frequently dwarfed by inadequate physical sieving or electrostatic adsorption mechanisms to capture airborne particulate matters (PMs). Here, using the parallel spinning approach...

The widespread utilization of conventional porous skeleton adsorption strategies is often limited by the inho-mogeneous and inadequate encapsulation due to the surface tension between skeleton and phase change material. Therefore, it remains challenging to achieve high compatibility between the support material and phase change material. Herein, fo...

Recycling plastic waste efficiently and cleanly is one of the key ways to reduce environmental pollution and carbon emissions. At present, the disposal methods of waste plastics mainly include landfill,...

Phase change materials (PCMs) have gained significant attention as thermal energy storage materials for reducing dependence on fossil fuels. However, the leakage caused by long-term molecular motion has become a bottleneck for the further advances of energy storage density and application value. Herein, a novel PCM composite with good shape stabili...

UV-cured polymerization systems can be cured under photocatalytic conditions and bearing the advantages of fast curing speed and mild curing conditions which are widely used in coatings, adhesives, electronic packaging and other fields. The cured polymer molecules are in a three-dimensional cross-linked network structure which can be entangled with...

Phase change thermal energy storage is one of the energy storage technologies with a wide range of applications due to its advantages of high heat storage density and stable phase transition temperature, but the low coefficient of thermal conductivity of phase change materials (PCM) has hampered the further development of this technology. It is an...

Waste battery materials are precious resources that can be recycled under certain specific conditions. Traditional recycling methods require high energy consumption, have low efficiency, and lead to serious pollution. With the aim of developing a mild and efficient approach to recycle spent cathode materials of lithium-ion batteries (LIBs), nanopar...

Phase‐change materials are of great interest in solving mismatch between energy supply and demand. However, the vulnerability of solid–liquid phase‐change materials to leakage during the phase‐change process limits their development and application in practice. Herein, the enhancement of the shape stability of phase‐change materials is achieved thr...

Nanofluids have emerged as an important working fluid for various heat transfer and thermal energy transportation demands thanks to its promising thermal conductivity. While, poor static stability brought by segregation of nanoparticle heavily hinders its wide practical utilization. In this work, a novel "one-pot one-step" strategy was realized to...

With the development of electronic machinery, the traditional heat exchange working fluid can no longer be used in some extreme working environments. As a new type of fluid, deep eutectic solvent has the advantages of promising thermal stability, low cost and non-toxicity through the hydrogen bond association of hydrogen bond acceptor and hydrogen...

Biomimetic mineralization of high-strength apatite structure essentially relies on mimicking the inorganic building blocks of naturally occurring bones. However, conventional routes still have substantial function gaps in providing precision control over the geometrical dimensions and crystalline morphology of biomineralized apatite. Herein, we con...

Inorganic phase change materials, especially for salt hydrate, possess superior energy storage density and thermal conductivity compared with organic phase change materials in low-grade thermal energy harvesting and management fields. More importantly, inorganic phase change materials are safer than that of organic phase change materials in terms o...

High value-added use of waste plastic has emerged an urgent research topic due to its heavy pollution to environment. Meanwhile, fluctuant characteristic of renewable energy leads to energy storage techniques to be always at the core of energy research. A protocol which could solve the pollution brought by waste plastics and making an energy storag...

The application of poly(lactic acid) (PLA) in the packaging area is frequently dwarfed by the inadequate gas/water barrier properties, low heat resistance and high UV transmittance. Herein, an environmentally friendly and high-efficiency microwave-assisted functionalization (MAF) approach was proposed to aqueous grafting waste bamboo fibers with th...

Working fluids act as a core role in low-grade thermal energy transportation. Deep eutectic solvent (DES), as a novel environmental solvent, has good stability and environmentally friendly, suitable for a variety of heat exchange environment. It has been emerging in working fluids thanks to superior chemical stability, low vapor pressure and promis...

Thermosetting resin is a kind of resin material that can be cured by cross-linking reaction under the con�dition of heating or radiation, and gradually hardened and molded, which has the advantages of high heat resist�ance and not easily deformed by pressure, and it was widely used in the fields of coating, adhesive and electronic packaging. Existi...

Currently, with the scarcity of primary energy, the significance of energy utilization efficiency has been gained much attention. Phase change thermal storage can effectively enhance energy utilization efficiency, people have started to combine phase change materials with other substances to further increase their application scope. Nano�titanium d...

Liquid phase leakage, intrinsic rigidity and easy brittle failure are the long-standing bottlenecks of phase change materials (PCMs) for thermal energy storage, which seriously hinder their widespread applications in advanced energy-efficient systems. Emerging flexible composite PCMs that are capable of enduring certain deformation and guaranteeing...

Website: https://www.frontiersin.org/research-topics/35441

Functional phase‐change materials (PCMs) are conspicuously absent in various organic or inorganic solids with diversified applications in which the attributes of these molecular materials have been highly realized. Leakage problem during the phase transition process is the main obstacle on the way of widely use of solid‐liquid PCMs who has been rec...

Several reports have shown the potential of nanofluids in enhancing the performance of heat transfer applications. Multi-walled carbon nanotubes are getting substantial attention among researchers due to their excellent characteristics such as high thermal conductivity. Functionalizing MWCNTs using COOH functional groups creates the carbon nanotube...

Nanofluid has gained vast attention as a novel heat transfer working fluid owing to its superiority in thermal conductivity and rheological properties. Meanwhile, the liquid range and the stability of nanofluids are of great significance since it dominates the utilization scope of a working fluid. In this work, with the aim at solving the poor stab...

Waste lithium-ion batteries not only cause serious waste of resources but also bring serious environmental pollution problems. Besides, the traditional methods of recycling lithiumion battery materials have the shortcomings of high-energy consumption, high cost and secondary pollution. In this paper, we successfully prepared ethylene glycol/ZnCl2 d...

Glycerol, which bears green, low-cost, and good miscibility features, provides a variety of solvent portfolios to satisfy the complex market demands. Owing to its abundant feedstock and unique properties, glycerol is a good candidate in catalysis, high-value-added chemical conversion, and solvents. It can also be used as an energy transportation me...

Phase‐change materials (PCMs) play a key role in thermal energy storage owing to their high‐energy storage density and small temperature fluctuation during the phase‐transition stage. Polymers, either as a supporting material to prevent liquid leakage during the phase‐change process or used with specific target, have been widely recognized in the f...

In this paper, the thiol-modified paraffin/silica microencapsulated phase change materials (MEPCM) was synthesized using tetraethoxysilane (TEOS) and (3-mercaptopropyl)-trimethoxysilane (MPTMS) by interfacial co-hydrolysis and co-polycondensation as the aim of improving the thermal stability and suspension stability. The effect of MPTMS was analyze...

As the continuing integration and size deflation of component dimensions in electronic circuits and increase in the number of transistors in modern microprocessor chips, especially for heat dissipation of micro/nano scale devise, traditionally used single phase fluid cannot meet the requirements for highly efficient heat transfer, which thus freque...

A hybrid hypercrosslinked polymer was prepared that is capable of encapsulating both organic and inorganic phase change materials via a novel homogeneous‐to‐heterogeneous encapsulation strategy. Abstract In this work, an organic/inorganic hybrid polymer containing siloxyl functional groups was synthesized and applied to encapsulate phase change ma...

In this study, the effects of different surfactants on the stability and thermophysical properties of graphene (GR) filled water (W) nanofluids were investigated in an experimental manner. Nanofluids filled by 0.05% mass fraction of GR nanoparticles with a surfactant concentration of 0.02%, 0.04%, 0.06%, 0.08%, and 0.1% were studied. The effects of...

Acting as a C1 building block, formaldehyde is of great significance in organic synthesis. It is also a key feedstock in several industries, such as, resins, polymers, adhesives, and paints. Multicomponent reactions (MCRs) have emerged as applicable tools in organic reactions because efficient MCRs allow the creation of several chemical bonds in on...

With the continuing development in the electric industry, highly efficient heat dissipation is of great significance due to the shrinkage of electric elements and increase in energy input. Working fluid, acting as a heat transfer medium, plays a core role in the thermal management. While, traditionally used working fluids suffer from either low the...

Polystyrene (PS) is rich in plastic materials, but it produces a large amount of waste every year, causing a huge burden on the environment. Although PS plastic is the source of a common "white pollution" in daily life, it still has a high utilization value. At the same time, the flammability of PS material determines that it cannot be applicated i...

Though a range of methods has been dedicated to solving the leakage problems, a versatile method which can meet with the organic and inorganic phase change materials (PCMs) simultaneously still have not been seen. In this work, an organic/inorganic hybrid Silioxyl functional group containing polymer was synthesized and applied to encapsulated PCMs....

Modified graphene/deionized water (DW) based amphiphilic nanofluid (A-nanofluid) without surfactant was prepared through chemical method. The thermal performance of solar gravity heat pipe (SGHP) with A-nanofluid was investigated under different heating powers, incline angles and concentrations. It was found that A-nanofluid can reduce the start-up...

Phase change materials play a vital role in the field of thermal management field, in particular for the microen�capsulated protocols owing to its large specific area, enhanced thermal stability and controlled volume varia�tion. However, its sophisticated preparation process associated with complex chemical or physical events still heavily hinders...

Stability issue is a core factor to appraise the performance of nanofluids since it heavily associates with its practical utilization scope in a range of occasions. To improve the static stability of graphene filled nanofluids, in this work, a quaternary ammonium species containing polymer wrapped graphene (PWG) was synthesized via an in-situ polym...

Thermal energy storage (TES) is among the most powerful tools to alleviate the risk of fossil energy depletion. Latent heat density and thermal conductivity are the two most important parameters to evaluate the performance of TES materials. In this work, for the first time, we embed knitting aryl network polymers (KAPs) on the skeleton of copper fo...

Polystyrene is an important part of the plastic material family. It has a series of advantages such as light weight, heat insulation, waterproof, and cheap. Landfill and incineration are the two main ways to dispose the waste plastic, but they will inevitably cause environment damage and the waste of fossil resource. As the rapid advancement of che...

To high value-added utilization of waste polystyrene (PS) foam, an in-situ phase change material (PCM) encapsulation protocol was realized by using waste PS foam as a holding material for thermal energy storage with a shape-stabilization methodology. Mechanistic study suggested that the robust Lewis acid catalysed Friedel-Crafts reaction involved w...

Liquid range of nanofluids is a crucial parameter as it intensively determines their application temperature scope. Meanwhile, improved thermal conductivity and stability are of great significances and comprise the main fundamental research topics of nanofluids. In this work, 2-butoxy-3,4-dihydropyran (DP), produced from a convenient one-pot three-...

Thermal energy storage and release is of great interest in solving mismatch between energy supply and demand. Latent heat capacity and thermal conductivity are the two main factors needed to be considered for practical applications of shape-stabilization phase change materials (PCMs). Herein, a hierarchical hypercrosslinked polymer (HCP)/expanded g...