Nano-structured smart hydrogels with rapid response and high elasticity

Lie-wen, Xia; Xie, Rui; Ju, Xiao‐Jie; Wang, Wei; Chen, Qianming; Chu, Liang‐Yin

doi:10.1038/ncomms3226

Cited by 613 publications

(499 citation statements)

References 44 publications

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“…On the other hand, the hygroscopic movements of pine cones 24 and ice plant seed capsules 22 , although slower, can function even when the host organisms are dead. Recently, enormous efforts have been paid to these bio-prototypes, with progress being made on responsive nanocomposites and surfaces 3 , energy generators and transducers 25,26 , programmable origami 27 , soft robotics [28][29][30] , smart gels [31][32][33] and artificial muscles [34][35][36] . Yet, most of the polymer actuators suffer from the relatively slow and small scale movements; furthermore, they are susceptible to severe circumstances and involve complex preparation such as multistep lithographic processes 21,37 .…”

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confidence: 99%

An instant multi-responsive porous polymer actuator driven by solvent molecule sorption

et al. 2014

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Fast actuation speed, large-shape deformation and robust responsiveness are critical to synthetic soft actuators. A simultaneous optimization of all these aspects without trade-offs remains unresolved. Here we describe porous polymer actuators that bend in response to acetone vapour (24 kPa, 20°C) at a speed of an order of magnitude faster than the state-ofthe-art, coupled with a large-scale locomotion. They are meanwhile multi-responsive towards a variety of organic vapours in both the dry and wet states, thus distinctive from the traditional gel actuation systems that become inactive when dried. The actuator is easy-tomake and survives even after hydrothermal processing (200°C, 24 h) and pressing-pressure (100 MPa) treatments. In addition, the beneficial responsiveness is transferable, being able to turn 'inert' objects into actuators through surface coating. This advanced actuator arises from the unique combination of porous morphology, gradient structure and the interaction between solvent molecules and actuator materials.

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confidence: 99%

An instant multi-responsive porous polymer actuator driven by solvent molecule sorption

et al. 2014

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“…Modification of nanostructure has been able to produce hydrogels with a large swelling ratio, rapid response rate and elastic properties that permit extensive deformation without fracture [112]. In a two-step synthesis, functionalised nanogels of less than 100 nm in diameter are created, which are then subsequently joined together.…”

Section: Plant Tissues-volume-changementioning

confidence: 99%

Morphing in nature and beyond: a review of natural and synthetic shape-changing materials and mechanisms

2016

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Shape-changing materials open an entirely new solution space for a wide range of disciplines: from architecture that responds to the environment and medical devices that unpack inside the body, to passive sensors and novel robotic actuators. While synthetic shape-changing materials are still in their infancy, studies of biological morphing materials have revealed key paradigms and features which underlie efficient natural shape-change. Here, we review some of these insights and how they have been, or may be, translated to artificial solutions. We focus on soft matter due to its prevalence in nature, compatibility with users and potential for novel design. Initially, we review examples of natural shape-changing materials-skeletal muscle, tendons and plant tissues-and compare with synthetic examples with similar methods of operation. Stimuli to motion are outlined in general principle, with examples of their use and potential in manufactured systems. Anisotropy is identified as a crucial element in directing shape-change to fulfil designed tasks, and some manufacturing routes to its achievement are highlighted. We conclude with potential directions for future work, including the simultaneous development of materials and manufacturing techniques and the hierarchical combination of effects at multiple length scales.

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“…They prefer in device mediated cosmetic applications such as derma-roller which enhances skin penetration of cosmetics. 34 …”

Section: Vesicular Delivery Systemsmentioning

confidence: 99%

Herbal Cosmetics and Novel Drug Delivery Systems

Yapar¹

2017

IJPER

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Herbal cosmetics are defined as the products which prepared by or included plants and/or herbal components which are combination of many natural molecules or compounds. In this context, critical parameters that affect the final quality and stability of herbal cosmetics are the specifications of herbal inputs, structure of formulation and manufacturing process. In addition to produce according to the good manufacturing practices of cosmetics (ISO 22716) in case of being natural or organic cosmetic it needs to meet the related international standard for technical definitions and criteria of natural and organic cosmetic ingredients and products (ISO 16128). Novel drug delivery systems are used in herbal cosmetics and between them vesicular, particular and emulsion based delivery systems are most preferable delivery systems. The advantages of such systems for herbal cosmetics can be listed as; enhanced efficacy, improved stability and decrease allergic potential of some herbal substances. As a result, choosing an appropriate drug delivery system for a herbal cosmetic is able to provide increased efficacy, stability and enhanced safety of the final product. Besides these advantages above mentioned since herbal cosmetics have become more complicated the fulfillment of quality requirements either during production or after packaging and during shelf life would be critical that need to fulfill long-term stability and dermatological safety.

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Nano-structured smart hydrogels with rapid response and high elasticity

Cited by 613 publications

References 44 publications

An instant multi-responsive porous polymer actuator driven by solvent molecule sorption

An instant multi-responsive porous polymer actuator driven by solvent molecule sorption

Morphing in nature and beyond: a review of natural and synthetic shape-changing materials and mechanisms

Herbal Cosmetics and Novel Drug Delivery Systems

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