Fluorescent cellulose nanocrystals/waterborne polyurethane nanocomposites for anti-counterfeiting applications

Ye, Xiu; Wang, Qianqian; Zhou, Peng; Zhang, Dongyang; Zhu, Pengli

doi:10.1039/d3cp00654a

Cited by 9 publications

(10 citation statements)

References 39 publications

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“…Thus, in addition to the above-mentioned actuators with integrated energy generation functions, the actuators integrated with energy storage functions have also developed rapidly. [43,44,[65][66][67][68] For example, soft supercapacitors are widely used in the field of actuators integrated with energy storage functions due to their flexible structure. [33,44,65] Typically, carbonbased materials (such as graphene, CNTs, and their derivatives) with high surface area, high electrical conductivity, light absorption ability, and thermal conductivity have been widely reported for both actuators and supercapacitors.…”

Section: Soft Actuators Integrated With the Functions Of Electrical E...mentioning

confidence: 99%

“…Consequently, Weng's group has devised a series of multi-functional actuators, as illustrated in Figure 6, which successfully integrate the functions of energy storage and actuation. In detail, the conductive films (such as PANI/RGO/CNT, [67] polyaniline@carbon nanotube-cellulose nanofibers (PANI@CNT-CNF), [43] polyanili- ne@carbon nanotube-bacterial cellulose (PANI@CNT-BC), [33] et al) employed in the construction of the soft actuators integrated with supercapacitors serve as electrodes, current collectors, and conductive connectors simultaneously. The actuation functionality is achieved by designing the polymer layer as the active layer in the multi-functional actuator, while the conductive films act as the energy storage layer and the inert layer.…”

Section: Soft Actuators Integrated With the Functions Of Electrical E...mentioning

confidence: 99%

“…Ye et al proposed the use of composites consisting of PANI@CNT-CNF to develop an integrated actuator. [43] When subjected to NIR light with an intensity of 250 mW cm À 2 , the integrated actuator undergoes a deflection of 45°. The pseudo-capacitance of PANI enhances the capacitance of the integrated actuator to a value of 39.8 mF.…”

Section: Soft Actuators Integrated With the Functions Of Electrical E...mentioning

confidence: 99%

“…However, the actuating materials with the ability of harvest and storage energy are still rare. Based on the advantages of large deformations of soft actuators, researchers have attempted to combine a series of functional materials (such as piezoelectric materials, [41] perovskite materials, [42] pseudocapacitance materials, [33,43,44] etc.) on the actuation materials to collect and storage electrical energy through physical laws such as triboelectric effect (Figure 1b), pyroelectric effect (Figure 1c), hydroelectric effects (Figure 1d), and the electric double layer capacitor (Figure 1e).…”

Section: Introductionmentioning

confidence: 99%

“…(b)The optical photos and schematic illustration of the bending motion of the integrated actuator (made with PANI@CNT-CNF composites) with lighting an LED at the same time. Reproduced with permission from Ref [43]…”

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confidence: 99%

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Soft multi‐layer actuators integrated with the functions of electrical energy harvest and storage

Feng,

Zhou,

Peng

et al. 2024

Chemistry A European J

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Soft multi‐layer actuators are smart, lightweight, and flexible, which can be used in a wide range of fields such as artificial muscles, advanced medical devices, and wearable devices. The research on the actuation property of the soft actuators has made significant progress, paving the way for the controllable motions of the actuators. However, compared with the intelligence and adaptability of life in nature, these actuators still have the problem of insufficient intelligence. The phenomenon is reflected in a lack of continuous supply of energy. Therefore, it has become a development trend to combine functions such as energy harvesting, storage, and conversion with actuators to build intelligent actuators. This concept presents a synopsis of the advancements made in soft actuators that have been coupled with the capabilities of electrical energy harvesting and storage. The design concepts and typical applications of this soft smart actuators are introduced in detail. Finally, the future research directions and applications of smart actuators are prospected from our perspective.

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Section: Soft Actuators Integrated With the Functions Of Electrical E...mentioning

confidence: 99%

Section: Soft Actuators Integrated With the Functions Of Electrical E...mentioning

confidence: 99%

Section: Soft Actuators Integrated With the Functions Of Electrical E...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Soft multi‐layer actuators integrated with the functions of electrical energy harvest and storage

Feng,

Zhou,

Peng

et al. 2024

Chemistry A European J

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Efficient preparation of cellulose nanocrystals and regulation of cholesteric liquid crystals for advanced anti‐counterfeiting

Li,

Gui,

Wan

et al. 2024

J of Applied Polymer Sci

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Cellulose nanocrystals (CNCs) can self‐assemble to form cholesteric liquid crystal, which make it one of the most promising optical materials at present. CNCs can be produced by sulfuric acid hydrolysis. It is found that hydrolysis conditions influence the existing form of reaction components and their reaction activities, which leads to different reaction routes and mechanisms under varied reaction conditions, with CNCs of varied quality produced. High‐quality CNC with more uniform particle size could be prepared at a critical acid concentration of 64 wt%, which was used to study the formation process of CNC liquid crystal and the structure regulation of cholesteric liquid crystal. By adjusting the drying temperature and adding a small molecule of water‐soluble chitosan (WSC) can well regulate cholesteric liquid crystal and change the pitch of a film, and the reflection wavelength can be redshifted, thus enriching texture patterns and creating distinctive color. Suitable addition of WSC can enhance the multi‐domain effect during liquid crystal formation process and finally creates more colorful film with fine texture. The rich and tunable liquid crystal characteristics endowed by WSC addition is irreplicable and artistic, which helps to realize the great potential application of the composite film in advanced anti‐counterfeiting.

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Ultra‐strong and biodegradable nanocomposite fibers of poly(butylene adipate‐co‐terephthalate)/cellulose nanocrystal prepared by dry‐jet wet spinning

Lee,

Kim,

Kim

et al. 2024

Polymer Composites

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Fiber‐based products constitute a significant portion of plastic waste and cause environmental damage. In particular, discarded sanitary masks and fishing gear disintegrate into microfiber plastics, posing a significant threat to human health and ecosystems. In this study, we developed robust biodegradable nanocomposite fibers of poly(butylene adipate‐co‐terephthalate) (PBAT)/cellulose nanocrystals (CNCs) (1 and 2 wt%) through dry‐jet wet spinning, by using dimethyl sulfoxide (DMSO) as a common solvent. The control PBAT fibers exhibit remarkable mechanical performance with tensile strength and toughness of 160.0 MPa and 43.0 MJ m−3, respectively. CNC addition has a toughening effect with slightly reduced strength but enhanced toughness (148.8 MPa and 69.0 MJ m−3, respectively, for 2 wt% CNC); their mechanical performances are superior to those of previously reported PBAT‐based materials. The remarkable performance of the fibers is attributed to a highly oriented structure with a total draw ratio of 15 after post‐hot drawing. The control and nanocomposite fibers exhibit spot‐like patterns in 2D wide‐angle x‐ray diffraction patterns with Herman's orientation factor of 0.54–0.58. The theoretical Hansen solubility parameter confirmed the poor chemical affinity between the PBAT and CNC. Nonetheless, the rheological characterization revealed that well‐dispersed CNCs with DMSO produced a physical network in the PBAT matrix, resulting in the toughening effect. Such robust nanocomposite fibers consisting of fully biodegradable components are promising alternatives to nondegradable nylon and polyester fibers.Highlights Robust biodegradable nanocomposite fibers of PBAT and CNC are prepared. Nanocomposite fibers are dry‐jet wet spun using DMSO as a common solvent. PBAT fibers exhibit strength and toughness of 160.0 MPa and 43.0 MJ m−3. 2 wt% CNC toughens the PBAT fibers with an enhanced toughness of 69.0 MJ m−3. Rheological results confirm the toughening effect of well‐dispersed CNC in PBAT.

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Fluorescent cellulose nanocrystals/waterborne polyurethane nanocomposites for anti-counterfeiting applications

Cited by 9 publications

References 39 publications

Soft multi‐layer actuators integrated with the functions of electrical energy harvest and storage

Soft multi‐layer actuators integrated with the functions of electrical energy harvest and storage

Efficient preparation of cellulose nanocrystals and regulation of cholesteric liquid crystals for advanced anti‐counterfeiting

Ultra‐strong and biodegradable nanocomposite fibers of poly(butylene adipate‐co‐terephthalate)/cellulose nanocrystal prepared by dry‐jet wet spinning

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