Electrically/infrared actuated shape memory composites based on a bio-based polyester blend and graphene nanoplatelets and their excellent self-driven ability

Zhang, Zhi-xing; Dou, Jiaxin; He, Jie-hao; Chenxi, Xiao; Shen, Lin-yun; Yang, Jing‐hui; Wang, Yong; Zhou, Zuowan

doi:10.1039/c7tc00828g

Cited by 61 publications

(24 citation statements)

References 54 publications

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“…Considering this, graphene nanoplatelets are already employed in several technological fields. In fact, GnPs-based materials show increased tribology [26,27], mechanical [17,[28][29][30][31], biomedical [32][33][34], gas barrier [35,36], flame retardant [37,38], and heat conduction [39][40][41][42] properties. Furthermore, GnPs can transform plastic in an electrical conductor, converting it into a conformable material for electronics [43][44][45].…”

Section: Graphene and Graphene Nanoplateletsmentioning

confidence: 99%

Graphene Nanoplatelets-Based Advanced Materials and Recent Progress in Sustainable Applications

2018

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Graphene is the first 2D crystal ever isolated by mankind. It consists of a single graphite layer, and its exceptional properties are revolutionizing material science. However, there is still a lack of convenient mass-production methods to obtain defect-free monolayer graphene. In contrast, graphene nanoplatelets, hybrids between graphene and graphite, are already industrially available. Such nanomaterials are attractive, considering their planar structure, light weight, high aspect ratio, electrical conductivity, low cost, and mechanical toughness. These diverse features enable applications ranging from energy harvesting and electronic skin to reinforced plastic materials. This review presents progress in composite materials with graphene nanoplatelets applied, among others, in the field of flexible electronics and motion and structural sensing. Particular emphasis is given to applications such as antennas, flexible electrodes for energy devices, and strain sensors. A separate discussion is included on advanced biodegradable materials reinforced with graphene nanoplatelets. A discussion of the necessary steps for the further spread of graphene nanoplatelets is provided for each revised field.

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Section: Graphene and Graphene Nanoplateletsmentioning

confidence: 99%

Graphene Nanoplatelets-Based Advanced Materials and Recent Progress in Sustainable Applications

2018

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“…The design of bi-and multilayers resulted in flexible and fast electroresponsive PUR with shape recovery through the Joule effect [165,166]. A series of interesting studies have been published on light-triggered SMP applications: devices with visible and near-IR imaging sensitivity for soft tissue optical visualization [167], dynamic cross-linked PUR based on thermo-reversible chemistry (Diels-Alder reactions) containing polydopamine particles with self-healing properties [168] or poly(ethylene glycol)-based Au nanorods with induced healable properties [169], polymer composites with conferred stimuli-responsiveness to light illumination sequences for improved spatiotemporal shape control [170], electrically active polymer systems with incorporated carbon nanotubes (CNT) or graphene nanoplatelets [171] or poly(vinyl alcohol)-based films demonstrated self-cleaning surfaces upon polarized light [172]. In our previous study, we fabricated light-responsive PCL-based nanocomposites by combining two nanofillers (plasmonic AgNPs and cellulose nanocrystals) for successful photothermal effect upon IR illumination [66].…”

Section: Nonmechanical Transducersmentioning

confidence: 99%

Programmable Stimuli-Responsive Actuators for Complex Motions in Soft Robotics: Concept, Design and Challenges

et al. 2020

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During the last years, great progress was made in material science in terms of concept, design and fabrication of new composite materials with conferred properties and desired functionalities. The scientific community paid particular interest to active soft materials, such as soft actuators, for their potential as transducers responding to various stimuli aiming to produce mechanical work. Inspired by this, materials engineers today are developing multidisciplinary approaches to produce new active matters, focusing on the kinematics allowed by the material itself more than on the possibilities offered by its design. Traditionally, more complex motions beyond pure elongation and bending are addressed by the robotics community. The present review targets encompassing and rationalizing a framework which will help a wider scientific audience to understand, sort and design future soft actuators and methods enabling complex motions. Special attention is devoted to recent progress in developing innovative stimulus-responsive materials and approaches for complex motion programming for soft robotics. In this context, a challenging overview of the new materials as well as their classification and comparison (performances and characteristics) are proposed. In addition, the great potential of soft transducers are outlined in terms of kinematic capabilities, illustrated by the related application. Guidelines are provided to design actuators and to integrate asymmetry enabling motions along any of the six basic degrees of freedom (translations and rotations), and strategies towards the programming of more complex motions are discussed. As a final note, a series of manufacturing methods are described and compared, from molding to 3D and 4D printing. The review ends with a Perspectives section, from material science and microrobotic points of view, on the soft materials’ future and close future challenges to be overcome.

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“…24,[35][36] In this context, polyurethane has attracted much attention in biomedical research, due to its high elasticity, biocompatibility, chemical resistance, sterilizability, excellent strength and high elastic memory for maintaining tension. [37][38][39] A range of biomedical devices such as vascular grafts, cardiac valves, catheters, mammary prostheses, stents, intravaginal rings, bacterial cell detector and ocular implants have been prepared from polyurethanes. [40][41][42] Nevertheless, one of the disadvantages of conventional polyurethane is that it is synthesized through the nucleophilic addition of hydroxyl and isocyanate moieties to yield urethane (Ð NHÐCOÐOÐ) linkages, as isocyanates are potentially carcinogenic and also highly moisture sensitive in nature.…”

Section: Introductionmentioning

confidence: 99%

Mitochondria Targeting Non-Isocyanate-Based Polyurethane Nanocapsules for Enzyme-Triggered Drug Release

et al. 2018

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Surface engineering of nanocarriers allows fine-tuning of their interactions with biological organisms, potentially forming the basis of devices for the monitoring of intracellular events or for intracellular drug delivery. In this context, biodegradable nanocarriers or nanocapsules capable of carrying bioactive molecules or drugs into the mitochondrial matrix could offer new capabilities in treating mitochondrial diseases. Nanocapsules with a polymeric backbone that undergoes programmed rupture in response to a specific chemical or enzymatic stimulus with subsequent release of the bioactive molecule or drug at mitochondria would be particularly attractive for this function. With this goal in mind, we have developed biologically benign nanocapsules using polyurethane-based, polymeric backbone that incorporates repetitive ester functionalities. The resulting nanocapsules are found to be highly stable and monodispersed in size. Importantly, a new non-isocyanate route is adapted for the synthesis of these non-isocyanate polyurethane nanocapsules (NIPU). The embedded ester linkages of these capsules' shells have facilitated complete degradation of the polymeric backbone in response to a stimulus provided by an esterase enzyme. Hydrophilic payloads like rhodamine or doxorubicin can be loaded inside these nanocarriers during their synthesis by an interfacial polymerization reaction. The postgrafting of the nanocapsules with phosphonium ion, a mitochondria-targeting receptor functionality, has helped us achieve the site-specific release of the drug. Co-localization experiments with commercial mitotracker green as well as mitotracker deep red confirmed localization of the cargo in mitochondria. Our in vitro studies confirm that specific release of doxorubicin within mitochondria causes higher cytotoxicity and cell death compared to free doxorubicin. Endogenous enzyme triggered nanocapsule rupture and release of the encapsulated dye is also demonstrated in a zebrafish model. The results of this proof-of-concept study illustrate that NIPU nanocarriers can provide a site-specific delivery vehicle and improve the therapeutic efficacy of a drug or be used to produce organelle-specific imaging studies.

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Electrically/infrared actuated shape memory composites based on a bio-based polyester blend and graphene nanoplatelets and their excellent self-driven ability

Abstract: Electrically/infrared actuated shape memory composites and their self-driven ability were realized for the PCL/PU blends by incorporating GNP particles.

Cited by 61 publications

References 54 publications

Graphene Nanoplatelets-Based Advanced Materials and Recent Progress in Sustainable Applications

Graphene Nanoplatelets-Based Advanced Materials and Recent Progress in Sustainable Applications

Programmable Stimuli-Responsive Actuators for Complex Motions in Soft Robotics: Concept, Design and Challenges

Mitochondria Targeting Non-Isocyanate-Based Polyurethane Nanocapsules for Enzyme-Triggered Drug Release

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