Programmable wettability on photocontrolled graphene film

Wang, Jie; Gao, Wei; Zhang, Han; Zou, Minhan; Chen, Yongping; Zhao, Yuanjin

doi:10.1126/sciadv.aat7392

Cited by 272 publications

(148 citation statements)

References 41 publications

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“…fractal, latent heat storage, metal foam, solidification 1 | INTRODUCTION Latent heat storage (LHS) based on a phase change material (PCM) is found in a multitude of practical engineering applications, such as solar energy utilization, 1 building energy conservation, 2 battery module cooling, 3 chemical engineering, 4,5 and space thermal control. 6 In these applications, the energy charging and discharging rate are of great significance, so the challenge is enhancing the thermal performance of engineering-utilized PCMs arising from their low thermal conductivity.…”

Section: Discussionmentioning

confidence: 99%

Role of metal foam in solidification performance for a latent heat storage unit

Huang

Zhang

2019

Int J Energy Res

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Summary The current latent heat storage (LHS) units are usually poor in energy charging and discharging efficiency. Given this, a two dimensional (2D) numerical model of the energy discharging process is presented and comprehensively analyzed to predict the role of metal foam in the solidification performance of LHS units. In the model, the fractal geometry reconstructed by the fractal Brownian motion is utilized for the pore characterization of the metal foam. The proposed model is validated through a melting experiment in copper foams from the reference. The temperature dynamic response and the solidification front evolution in metal foam are analyzed and compared to those in a corresponding cavity. The roles of the fractal dimension and porosity in the solidification behaviors are quantitatively analyzed. The results report that the presence of metal foam enhances the solidification performance. For the main goal of maximizing the latent storage, the appropriate porosity of an LHS unit is dependent on the duration time for the heat discharging process in the real application of thermal energy storage. Even if the porosity is the same, the fractal dimension also affects the solidification performance. A decrease in the fractal dimension (lower degree of disorder for pore distribution) provides greater access to heat flow through the phase change material‐foam composite and thus leads to improvement in the interstitial heat transfer, which in turn accelerates the rate of heat release. The fractal dimension is expected to be less than 1.5 for superior solidification performance.

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Section: Discussionmentioning

confidence: 99%

Role of metal foam in solidification performance for a latent heat storage unit

Huang

Zhang

2019

Int J Energy Res

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“…These pipetting devices simplify liquid handling in the microplate and microarrays, which is time‐consuming and labor‐intensive in applications, such as practical blood grouping diagnosis. For instance, Wang and co‐workers adopted paraffin as lubricant to infuse structural graphene film and form programmable E‐LIS . Based on graphene's photothermal property, this film displayed controllable patterned wettability, as shown in Figure a.…”

Section: Applications Of E‐lismentioning

confidence: 99%

“…a) Schematic illustration of programmable wettability on temperature E‐LIS (left), and pipetting droplets to form microarrays (right). Reproduced with permission . Copyright 2018, American Association for the Advancement of Science.…”

Section: Applications Of E‐lismentioning

confidence: 99%

External Stimuli Responsive Liquid‐Infused Surfaces Switching between Slippery and Nonslippery States: Fabrications and Applications

Lou

Huang

Yang

et al. 2020

Adv Funct Materials

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Surfaces with controllable liquid wettability and related functions have gained increasing attention from interfacial scientists due to the high demand of fundamental research and practical applications. Inspired by pitch plant's excellent liquid repellency, external stimuli responsive lubricant‐infused surfaces switching between slippery state and nonslippery state under external stimuli (E‐LIS) have been developed by introducing external stimuli responsive materials as substrates, lubricants, or repellent liquids. This progress report is focused on recent development of E‐LIS. First, design strategy and fabrication of E‐LIS upon external stimuli exposure, including stress, electrical field, magnetic field, and temperature, is summarized. Then, emerging interfacial applications of E‐LIS, such as microreactors, pipetting devices, fog collection devices, and so on, are highlighted. In addition, remaining challenges and future prospects are provided.

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“…The main challenge for the utilization of the ice storage system is the low heat conductivity of PCMs [17,18]. Therefore, several enhancement methods have been taken for the improvement of the ice storage system, including fins [19], metal foam [20], microcapsules [21,22], nanoparticles [23] and heat pipes [24,25].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Influence of the Longitudinal Fins on the Enhancement of a Shell-and-Tube Ice Storage Device

et al. 2020

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The theoretical model of the solidification process of a shell-and-tube ice storage (STIS) device with longitudinal fins is established. The liquid fraction, the energy-discharging rate and the ice storage ratio are investigated, with particular focus on the effects of the fin structure parameters on the solidification process. Furthermore, the temperature and the streamline distributions are discussed to reveal the mechanism of the solidification process in the STIS device and the negative effect of natural convection (NC). It is indicated that the solidification process of the STIS device is dominated by the heat transfer via the fins at the beginning, and then by the heat transfer at the water-ice interface. The ice storage is negatively affected by the NC, for the reason that the water with a higher temperature stays in the lower part of the STIS device and the temperature gradient at the water-ice interface is small. The ice storage performance can be enhanced by increasing the fin structure parameters, including height, thickness and number.

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Programmable wettability on photocontrolled graphene film

Abstract: We fabricated a paraffin-infused porous graphene film with programmable wettability for the spatiotemporal droplet manipulation.

Cited by 272 publications

References 41 publications

Role of metal foam in solidification performance for a latent heat storage unit

Role of metal foam in solidification performance for a latent heat storage unit

External Stimuli Responsive Liquid‐Infused Surfaces Switching between Slippery and Nonslippery States: Fabrications and Applications

Numerical Simulation on the Influence of the Longitudinal Fins on the Enhancement of a Shell-and-Tube Ice Storage Device

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