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[IEEE 2019 4th International Conference on Information Technology, Information Systems and Electrical Engineering (ICITISEE) - Yogyakarta, Indonesia (2019.11.20-2019.11.21)] 2019 4th International Conference on Information Technology, Information Systems and Electrical Engineering (ICITISEE) - Real-Time Irradiance Estimation Based on Maximum Power Current of Photovoltaic
摘要： One critical issue, for a wireless sensor network (WSN) to operate successfully, is to provide sufficient sensing coverage. Define the smart sensing environment as a sensing system with the capability to sense the environment and respond properly in an automated manner. In this paper, we target on smart sensing environments and deal with heterogeneous sensors (here sensor heterogeneity is defined as sensors having different sensing ranges) equipped with actuation facilities to assist in the sensor self-deployment. A coverage-aware sensor automation (CASA) protocol is proposed to realize an automated smart monitoring network. Two centralized algorithms are included in the CASA protocol suite: enhanced virtual forces algorithm with boundary forces (EVFA-B) and sensor self-organizing algorithm (SSOA). Unlike most previous works that tackle the deployment problem only partially, we intend to address the problem from both global deployment (EVFA-B) and local repairing (SSOA) perspectives. The EVFA-B protocol exerts weighted attractive and repulsive forces on each sensor based on predefined distance thresholds. Resultant forces then guide the sensors to their suitable positions with the objective of enhancing the sensing coverage (after a possibly random placement of sensors). Furthermore, in the presence of sensor energy depletions and/or unexpected failures, our SSOA algorithm is activated to perform local repair by repositioning sensors around the sensing void (uncovered area). This capability of local recovery is advantageous in terms of saving the communication and moving energies. Performance of the proposed sensor deployment strategies is evaluated in terms of surveillance coverage, monitoring density, network self-healing competence, and moving energy consumption. We also implement our CASA protocol suite in a real-life monitoring network (MoNet) to demonstrate the protocol feasibility and validate the MoNet detection capability of emergency events.
关键词： self-healing,smart sensing environment,Wireless sensor deployment,coverage problem,sensor automation
更新于2025-09-19 17:13:59
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Entangled Azobenzene‐Containing Polymers with Photoinduced Reversible Solid‐to‐Liquid Transitions for Healable and Reprocessable Photoactuators
摘要： Photoactuators based on liquid crystal elastomers or networks are smart materials that show photoinduced motions. However, their crosslinked networks make their repair or reprocessing difficult. Here, a healable and reprocessable photoactuator is fabricated using entangled high-molecular-weight azobenzene-containing polymers (azopolymers) that are non-crosslinked. A series of linear liquid crystal azopolymers with different molecular weights are synthesized. The low-molecular-weight azopolymers (5–53 kg mol?1) cannot form freestanding photoactuators because their polymer chains lack entanglements, which makes them hard and brittle. In contrast, flexible and stretchable actuators are fabricated using high-molecular-weight azopolymers (80–100 kg mol?1) that exhibit good processability because of the polymer chain entanglements. The azopolymer photoactuators show photoinduced bending based on photoinduced trans–cis isomerization of the azopolymers on the irradiated side. The experiments show not only photoinduced phase transitions or changes in the order parameters but also photoinduced solid-to-liquid transition of the azopolymers resulting in shape changes and mechanical responses. Thus, photoinduced solid-to-liquid transition is a new mechanism for the design of photoactuators. Moreover, the azopolymer photoactuators are healable and reprocessable via solution processing or light irradiation. Healability and reprocessability prolong lifetimes of photoactuators are important for materials reusage and recycling, and represent a new strategy for the preparation of smart materials.
关键词： azobenzene,actuators,photoswitches,polymers,self-healing
更新于2025-09-12 10:27:22
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Self-Healing Amorphous Polymers with Room-Temperature Phosphorescence Enabled by Boron-based Dative Bonds
摘要： Dative bonds are crucial for room-temperature phosphorescence (RTP) of metal complexes, which are nevertheless of high cost and toxicity. Here, we develop a class of amorphous RTP polymers based on non-metal dative bonds, through copolymerizing vinylphenylboronic acid and acrylamide derivates. Non-metal dative bonds, formed between boron and nitrogen/oxygen atoms, can populate triplet excitons through charge transfer and immobilize phosphors to suppress nonradiative relaxation, leading to effective RTP lifetime in air. Moreover, the dynamic nature of the dative bonds enables self-healing and anti-counterfeiting abilities of the RTP polymers. The concept of designing non-metal dative bonds can widely expand the horizon and application of RTP polymers.
关键词： self-healing,polymer,dative bond,room-temperature phosphorescence,boron
更新于2025-09-12 10:27:22
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Archimedean Spiral Inspired Conductive Supramolecular Elastomer with Rapid Electrical and Mechanical Self-Healing Capability for Sensor Application
摘要： In addition to flexibility and stretchability, self-healing capability will become another characteristic for next-generation electronics and devices. However, developing electronic materials with both good mechanical and electrical self-healing abilities still remains a great challenge yet an exciting goal. Herein, a new kind of self-healing conductive elastomer via alliance of supramolecular chemistry and Archimedean spiral-structure design is reported to break the trade-off between mechanical and electrical healing capabilities. The spirally structured conductive layout enables the material to rapidly self-heal both mechanical (within 15 s) and electrical (within 0.25 s) damages with high efficiency, while without sacrificing the softness and stretchability of the self-healing elastomer matrix. As a proof-of-concept, such materials can be used to fabricate self-healable wearable sensors for monitoring diverse human activities. The rapidly, efficiently, mechanically, and electrically self-healing materials demonstrated in this work facilitate the design and application of a wide range of stretchable and reliable electronic devices.
关键词： supramolecular elastomer,dynamical cross-linking,sensor,spiral structure,self-healing
更新于2025-09-10 09:29:36
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Shape-Deformable Self-Healing Electroluminescence Displays
摘要： Self-healing electronic materials can substantially enhance the lifetime of a device as they can self-repair mechanical damages, thereby recovering their initial electronic performance similar to human skin. Despite the development of various self-healing electronic components such as electrodes and semiconducting carrier transport layers, self-healing electroluminescence (EL) layers suitable for deformable displays, which require both high stretchability and self-recovery function, have been rarely demonstrated. Herein, shape-deformable and self-healing EL displays (SSELDs) are presented. Light-emitting materials are fabricated by adding a certain amount of a plasticizer, Triton X-100, to elastomeric poly(urethane) containing light-emitting Cu-doped ZnS microparticles to obtain a viscoelastic composite that undergoes facile shape-deformation and recovery. A capacitive SSELD exhibits frequency-dependent field-induced light emission under alternating current (AC). Color mixing and tuning of EL is conveniently achieved by mechanically mixing two or more Cu-doped ZnS microparticles with different EL characteristics. More importantly, an SSELD self-recovers its EL within few minutes of electrical failure. Further, the AC EL device endures more than 100 cycles of failure-recovery operations. By combining with a shape-deformable ionic liquid, a novel fiber display that exhibits excellent shape-deformable and self-healing EL performance is demonstrated.
关键词： viscoelastic light-emitting composites,self-healing displays,shape-deformable displays,fiber-type displays,polymer plasticizer,alternating current electroluminescence
更新于2025-09-10 09:29:36
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Rapid Self-healing Film From Novel Photo Polymerization Additive.
摘要： Self-healing materials have ability to repair damage by themselves. Their properties have been developed to increase the reliability of materials. Generally, self-healing polymers have been developed by thermal polymerization. Especially, hydrogel materials showed relatively rapid recovery and good-healing efficiency. However, it is very difficult to restore their properties without the self-healing mediator such as water. Herein, we report the novel type of self-healing polymer using photo-polymerization. This is achieved through an unprecedented concept of an additive of photopolymerization, named as ‘healer’ which can act as a physical crosslinker between main chains and a self-healing mediator in hydrogel materials. This transparent, easily fabricated self-healing polymer healed scratch in 40 seconds as well as restored the mechanical properties to 82%.
关键词： Self-healing properties,Supramolecular chemistry,Scratch recovery,Photo-polymerization,Polymers
更新于2025-09-10 09:29:36
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Multi-Triggered Supramolecular DNA/Bipyridinium Dithienylethene Hydrogels Driven by Light, Redox and Chemical Stimuli for Shape-Memory and Self-Healing Applications
摘要： Multi-triggered DNA/bipyridinium-dithienylethene (DTE) hybrid carboxymethyl cellulose (CMC) based hydrogels are introduced. DTE exhibits cyclic and reversible photoisomerization properties, switching between the closed state (DTEc), the electron acceptor, and the open isomer (DTEo) that lacks electron acceptor properties. One system includes the synthesis of CMC chains modified with electron donor dopamine sites and self-complementary nucleic acid tethers. In the presence of DTEc and the CMC scaffold, a stiff hydrogel, cooperatively stabilized by dopamine/DTEc donor-acceptor interactions and by the duplex nucleic acids is formed. The cyclic and reversible formation and dissociation of the supramolecular donor-acceptor interactions, through light-induced photoisomerization of DTE, or via the oxidation and subsequent reduction of the dopamine sites, leads to hydrogels of switchable stiffness. Another system introduces a stimuli-responsive hydrogel triggered by one of the three alternative signals. The stiff multi-triggered hydrogel consists of CMC chains crosslinked by the dopamine/DTEc donor-acceptor interactions, and by supramolecular K+-stabilized G-quadruplexes. The G-quadruplexes are reversibly separated in the presence of 18-crown-6 ether and reformed upon the addition of K+. The stiff hydrogel undergoes reversible transitions between high-stiffness and low-stiffness states triggered by light, redox agents or K+/crown ether. The hybrid donor-acceptor/G-quadruplex crosslinked hydrogels show shape-memory and self-healing features. By using three different triggers and two alternative memory-codes, e.g. the dopamine/DTEc or the K+-stabilized G-quadruplexes, the guided shape-memory formation of the hydrogel matrices are demonstrated.
关键词： hydrogels,self-healing,chemical stimuli,DNA,redox,shape-memory,light,Multi-triggered,bipyridinium-dithienylethene
更新于2025-09-09 09:28:46
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Intrinsically recyclable and self-healable conductive supramolecular polymers for customizable electronic sensors
摘要： Electronic waste is increasing rapidly and ruining ecosphere owing to the growing amount of unrecyclable and even toxic electronic materials. Sensing components and electronic boards, mainly composed of unrecyclable metal oxides and thermoset polymers, are two major sources of electronic waste. Hence, developing novel electronic materials that can be fully recycled and reused is one of the most investigated concerns for recyclable electronics. In this study, efforts are devoted to inventing an intrinsically recyclable conductive supramolecular polymer, which is composed of a sensing segment of ionic liquid crosslinked by dynamic quadruple hydrogen bonds. This supramolecular polymer exhibits remarkable thermal sensing ability, reprocessability, and recyclability. Based on these advantages, it can be easily molded into an electronic thermometer with controllable size and shape, which can be fully recycled; also, it retains the same thermal sensing performance. Particularly, this supramolecular polymer can be processed into thermal sensing earplugs with customized 3D shapes for ear-temperature measurement as a reliable monitoring approach of body temperature. Thus, it offers great potential for practical applications in special conditions.
关键词： conductive supramolecular polymer,recyclable electronics,self-healing,customizable electronic sensors,thermal sensing
更新于2025-09-09 09:28:46
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Metallosupramolecular Photonic Elastomers with Self‐Healing Capability and Angle‐Independent Color
摘要： Photonic elastomers that can change colors like a chameleon have shown great promise in various applications. However, it still remains a challenge to produce artificial photonic elastomers with desired optical and mechanical properties. Here, the generation of metallosupramolecular polymer-based photonic elastomers with tunable mechanical strength, angle-independent structural color, and self-healing capability is reported. The photonic elastomers are prepared by incorporating isotropically arranged monodispersed SiO2 nanoparticles within a supramolecular elastomeric matrix based on metal coordination interaction between amino-terminated poly(dimethylsiloxane) and cerium trichloride. The photonic elastomers exhibit angle-independent structural colors, while Young’s modulus and elongation at break of the as-formed photonic elastomers reach 0.24 MPa and 150%, respectively. The superior elasticity of photonic elastomers enables their chameleon-skin-like mechanochromic capability. Moreover, the photonic elastomers are capable of healing scratches or cuts to ensure sustainable optical and mechanical properties, which is crucial to their applications in wearable devices, optical coating, and visualized force sensing.
关键词： elastomers,metallosupramolecular coordination,self-healing,photonic crystals,angle-independent
更新于2025-09-04 15:30:14