An Shun

• Doctor of Philosophy
• Shanghai Jiao Tong University

This report presents liquid metal-based infrared-modulating materials and systems with multiple modes to regulate the infrared reflection. Inspired by the brightness adjustment in chameleon skin, shape-morphing liquid metal droplets in silicone elastomer (Ecoflex) matrix are used to resemble the dispersed “melanophores”. In the system, Ecoflex acts...

Control of convection plays an important role in heat transfer regulation, bio/chemical sensing, phase separation, etc. Current convection controlling systems generally depend on engineered energy sources to drive and manipulate the convection, which brings additional energy consumption into the system. Here the use of human hand as a natural and s...

Stepwise temperature modulation was realized by the photothermal conversion process, which enabled the growth of complex architectures of CaCO 3 that are composed of multiple polymorphic phases.

The regulation and utilization of thermal energy is increasingly important in modern society due to the growing demand for heating and cooling in applications ranging from buildings, to cooling high power electronics, and from personal thermal management to the pursuit of renewable thermal energy technologies. Over billions of years of natural sele...

Noncontact human-machine interaction provides a hygienic and intelligent approach for the communication between human and robots. Current noncontact human-machine interactions are generally limited by the interaction distance or conditions, such as in the dark. Here we explore the utilization of hand as an infrared light source for noncontact human...

Significance The utilization of electricity-powered light sources as external stimuli is limited by the cost and energy loss. Here we demonstrate that the human hand can be used as a natural IR light source without the need of external power. As each finger can serve as an independent light source, the hand can also be utilized as a multiplexed IR...

Radiative cooling, which normally requires relatively high infrared (IR) emissivity, is one of the insects’ effective thermoregulatory strategies to maintain their appropriate body temperature. Recently, the physical correlation between the delicate biological microstructures and IR emissivity for thermal radiation draws increased attention. Here,...

A simple, fast, and contactless alternative for the generation of nanodroplets in solution is to apply light to stimulate their formation at a surface. In this work, a light-driven mechanism for the generation of nanodroplets is demonstrated by using a porous membrane. The membrane is placed at the interface between oil and water during the nanodro...

Biological systems outperform engineered systems in many aspects due to billions of years of evolution in advance. With the integration of biological components, engineered functional systems can enjoy the benefits of biological systems, as well as the blurring of the boundary with living systems, including humans.

This work explores an alternative vapor sensing mechanism through analyzing dynamic desorption process from butterfly wings for the differentiation of both individual and mixed vapors quantitatively. Morpho butterfly wings have been used in differentiating individual vapors, but it is challenging to use them for the differentiation of mixed vapor q...

Human skin shows self‐adaptive temperature regulation through both enhanced heat dissipation in high temperature environments and depressed heat dissipation in cold environments. Inspired by such thermal regulation processes, an interfacial material system with self‐adaptive temperature regulation in the solar‐driven interfacial evaporation system,...

Discrete droplet transport has drawn much interest in a broad range of applications. Controlling the motion direction, however, is a long-lasting challenge in droplet transport. In this work, a simple yet efficient approach is demonstrated to realize the motion of droplet with controllable direction on nanostructured surfaces with predefined channe...

This work explores an alternative infrared (IR) detection mechanism that is based on the desorption of vapor molecules from the Morpho butterfly nanostructures under the stimulation of incoming IR photons, and demonstrates the use of such stimulated desorption for both broadband and wavelength selective IR detection. Compared to the structural defo...

Solar driven interfacial evaporation, as one of the most effective ways to convert and utilize solar energy, attracts lots of studies recently. Most of the previous researches, however, mainly focused on non-patterned solar absorbers by improving the structural and chemical characteristics of the solar absorbers used in the interfacial evaporation...

This work reports a bioinspired three-dimensional (3D) heterogeneous structure for optical hydrogen gas (H2) sensing. The structure was fabricated by selective modification of the photonic architectures of Morpho butterfly wing scales with Pd nanostrips. The coupling of the plasmonic mode of the Pd nanostrips with the optical resonant mode of the M...

Morpho sulkowskyi butterfly wings contain naturally occurring hierarchical nanostructures that produce structural coloration. The high aspect ratio and surface area of these wings make them attractive nanostructured templates for applications in solar energy and photocatalysis. However, biomimetic approaches to replicate their complex structural fe...