Biphasic organohydrogels based on phase change materials with excellent thermostability for thermal management applications

Shen, Xin; Wang, Feifei; Mao, Zhiping; Xu, Hong; Wang, Bijia; Sui, Xiaofeng; Feng, Xueling

doi:10.1016/j.cej.2021.129181

Cited by 31 publications

(15 citation statements)

References 43 publications

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“…However, TRHE still has a higher thermal storage capability compared to other phase-change hydrogels. [24][25][26] The temperature-time curves for the overheating operation are shown in Figure 2c. For the TRHE, a slow temperature increase and maximum temperature of 83 °C were observed after 60 min of heating.…”

Section: Resultsmentioning

confidence: 99%

Developing Thermoregulatory Hydrogel Electrolyte to Overcome Thermal Runaway in Zinc‐Ion Batteries

Meng

Zhang

Peng

et al. 2022

Adv Funct Materials

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Zinc‐ion batteries (ZIBs) that use water‐based electrolytes have attracted significant attention. However, under harsh conditions, extreme heat is accumulated inside ZIBs, which inevitably causes thermal runway risk. Therefore, the practical applications of rechargeable ZIBs are significantly limited because the internal heat accumulated by harsh conditions induces drastic bulges or even explosions. To overcome this limitation, a self‐adaptive thermoregulatory hydrogel electrolyte (TRHE) that integrates phase transition chains with endothermic effects into agarose backbones via hydrogen bonding interactions is reported. Under extreme conditions, TRHE can tolerate sudden thermal shock; thus, ZIBs can function properly for a period in environments (100 °C) owing to their thermally self‐regulating feature, which alleviates the thermal issues associated with batteries. The hydrogel network with uniform ion migration channels can accelerate ion transport and homogenize ion distribution to realize dendrite inhibition; in addition, other pressing concerns can be effectively resolved, including hydrogen evolution and Zn corrosion, which significantly contribute to the outstanding electrochemical performance. It is believed that the proposed TRHE will help in overcoming thermal runaway in ZIBs and in other aqueous batteries.

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Section: Resultsmentioning

confidence: 99%

Developing Thermoregulatory Hydrogel Electrolyte to Overcome Thermal Runaway in Zinc‐Ion Batteries

Meng

Zhang

Peng

et al. 2022

Adv Funct Materials

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“…In the case of organohydrogels, the water loss is rapidly decreased in range of 30 from 100 °C, in particular, the mass loss is about 25, 10, and 5 wt % for OH-5, OH-20 and OH-40 in which the original water content is around 93, 77, and 57 wt %, respectively. The enhanced water retention capacity of organohydrogels might owe to the in situ heterophase structure and hydratable salt (CaCl 2 ) . The gelation process is monitored through rheological study, reflecting a delayed sol–gel transition from the crossover of storage modulus ( G ′) and loss modulus ( G ′′) curves after phase-change microinclusions are introduced (Figure c). , For example, the G ′ and G ′′ curves of OH-0 intersect at around 20 s, while the overlap point of OH-5, OH-20, and OH-40 appears at about 65, 50, and 55 s, respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Biphasic organohydrogels, encapsulating the organic phase within a hydrogel network, have been fabricated for more innovative applications, including soft actuators, biological medicine, sensors, and tissue engineering. , The gelation of external hydrogel networks is enhanced through the interdroplet bridging among dispersed organic phases . The internal organic phase, meanwhile, can endow biphasic organohydrogels with multifunctionalities, for example, the switchable mechanical property and shape memory behavior, − programmable wettability, − thermal energy storage and release, − controllable drug release, and injury visualization …”

Section: Introductionmentioning

confidence: 99%

Temperature-Sensitive Anti-Inflammatory Organohydrogels Containing Janus Particle Stabilized Phase-Change Microinclusions

Gui

Yang

et al. 2022

ACS Nano

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A fabrication strategy for multifunctional organohydrogels is proposed, which combines phase-change microinclusions within a double-network (DN) hydrogel under the stabilization of Janus particles. Janus particles possess reactivity and colloidal stability for more robust organohydrogels, while the interstice among Janus particles enhances the mass transfer between the phase interfaces. Moreover, DN hydrogels are achieved through dynamic cross-linking networks, endowing organohydrogels with injectability and self-healing performance. Phase-change microinclusions are beneficial to the organohydrogels with temperature-responsive mechanical property and temperature-programed shape-memory performance. Organohydrogels can be employed for temperature therapy through the melting-crystallization process of phase-change microinclusions. Simultaneously, the payloads within microinclusions can be released for antibacteria upon melting the encapsulated wax. The organohydrogels can be served as an ideal dressing with temperature-responsive mechanical property, temperature therapy effectiveness, and temperaturetriggered antibacterial ability.

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“…The interfacial tension of the heterostructures improves the shape recovery. [114] Other hydrogels, such as poly(acrylamide) (PAAm), [100,105,115,116] poly(acrylic acid) (PAA), [117,118] and poly(Nisopropyl acrylamide) (PNIPAM), [119] are also added to increase the reversible shape transformation performance. Since s-SVP with a long alkyl chain is normally hydrophobic, emulsifiers such as sodium dodecyl sulfate, [117] nanoclay, [102] gelatin, [120] and boehmite (AlOOH) nanoparticles [100] are necessary to stabilize the s-SVP based organohydrogels.…”

Section: Materials For Reversible Shape Transformationmentioning

confidence: 99%

Stiffness Variable Polymers Comprising Phase‐Changing Side‐Chains: Material Syntheses and Application Explorations

et al. 2022

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lack the adaptability biological muscles have for variable working environments. Emerging opportunities in airborne and submarine vehicles, agricultural manipulations, biomedical devices, and wearable electronics require materials with variable rigidity to respond to dynamically changing conditions. [3][4][5][6] The mechanical impedance of such materials can be altered or fine-tuned to allow the system to adapt without a sophisticated control algorithm. For example, when grasping a fragile object such as an egg using a gripper, a stiffness variable material provides an adaptive contact force to optimally complete the task. Similarly, bio-inspired robots and wearable exoskeletons require stiffness variable materials capable of a large stiffness change to provide structural load-bearing and mechanical work output. In the softened state, the material can deform to locomote, maneuver, and absorb the energy arising from a collision or when interfacing with the human body. Some applications, such as medical endoscope designs, involve "move-and-hold" operations. This is where a variable-stiffness structure that holds a particular orientation in space or rigidly supports a load is able to become deformable on demand to change shape or reposition. [7] Other potential applications that can benefit from variable stiffness materials include biomechanically compatible sensor insertions for neural implants, vibration, and noise control in aerospace structures, and conformal shape morphing robotic systems. Requirements of Stiffness Variable MaterialsTo impart the perceived smart and adaptive systems with versatile and advantageous functionalities matching or surpassing those of natural systems, the stiffness variable materials should possess the following important features:1. Wide modulus variation: A range of modulus variation greater than 100 or even 1000-fold is required. A high modulus is desired for load-bearing and supporting freestanding structures, while a low modulus provides conformation, shape transformation, energy absorption, and dissipation. 2. Mild stimulus: A mild stimulus to trigger the stiffness variable operation, such as a narrow temperature span in Stiffness variable materials have been applied in a variety of engineering fields that require adaptation, automatic modulation, and morphing because of their unique property to switch between a rigid, load-bearing state and a soft, compliant state. Stiffness variable polymers comprising phase-changing side-chains (s-SVPs) have densely grafted, highly crystallizable long alkyl sidechains in a crosslinked network. Such a bottlebrush network-like structure gives rise to rigidity modulation as a result of the reversible crystallization and melting of the side chains. The corresponding modulus changes can be more than 1000-fold within a narrow temperature span, from ≈10 2 MPa to ≈10 2 kPa or lower. Other important properties of the s-SVP, such as stretchability, optical transmittance, and adhesion, can also be altered. This work reviews the underlying molecular mech...

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Biphasic organohydrogels based on phase change materials with excellent thermostability for thermal management applications

Cited by 31 publications

References 43 publications

Developing Thermoregulatory Hydrogel Electrolyte to Overcome Thermal Runaway in Zinc‐Ion Batteries

Developing Thermoregulatory Hydrogel Electrolyte to Overcome Thermal Runaway in Zinc‐Ion Batteries

Temperature-Sensitive Anti-Inflammatory Organohydrogels Containing Janus Particle Stabilized Phase-Change Microinclusions

Stiffness Variable Polymers Comprising Phase‐Changing Side‐Chains: Material Syntheses and Application Explorations

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