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stimuli responsive materials

Shipeng Chen, Baohao Zhang, Nanxiang Zhang, Fengsheng Ge, Bao Zhang, Xiaoji Wang, Jian Song
Formation of supramolecular ionic liquid gels (ionogels) induced by low-molecular mass gelators (LMMGs) is an efficient strategy to confine ionic liquids and the negligible influence of LMMGs on the electrochemical properties of ionic liquids makes ionogels ideal quasi-solid electrochemical materials. Furthermore, the stimuli-responsive and self-healing characters of the supramolecular gel can be utilized for the potential development of smart electrochemical materials. However, the poor mechanical properties of supramolecular ionogel reported so far limit their practical applications...
January 19, 2018: ACS Applied Materials & Interfaces
Tim Verhagen, Vaclav Vales, Martin Kalbac, Jana Vejpravova
Graphene is extremely sensitive to optical, electrical and mechanical stimuli, which cause a significant variation of the band structure, thus physiochemical properties. In our work, we report on changes of strain and doping in graphene grown by chemical vapor deposition (CVD) and transferred onto a BaTiO3(100) (BTO) single-crystal. The BTO is known as a ferroelectric material, which undergoes several thermoelastic martensitic phase transitions when it is cooled from 300 K to 10K. In order to enhance the very weak Raman signal of the graphene monolayer (ML) on the BTO, a 15 nm thin gold layer was deposited on top of the graphene ML to benefit from the surface enhanced Raman scattering (SERS)...
January 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
T Paulraj, A V Riazanova, A J Svagan
Materials based on renewable biopolymers, selective permeability and stimuli-responsive release/loading properties play an important role in biomedical applications. Here, in order to mimic the plant primary cell-wall, microcapsules have been fabricated using cell wall polysaccharides, namely pectin, xyloglucan and cellulose nanofibers. For the first time, a large amount of xyloglucan was successfully included in such capsules. These capsules demonstrated stimuli-responsive (ON/OFF) permeability and biocompatibility...
January 13, 2018: Acta Biomaterialia
L Vanduyfhuys, S M J Rogge, J Wieme, S Vandenbrande, G Maurin, M Waroquier, V Van Speybroeck
Knowledge of the thermodynamic potential in terms of the independent variables allows to characterize the macroscopic state of the system. However, in practice, it is difficult to access this potential experimentally due to irreversible transitions that occur between equilibrium states. A showcase example of sudden transitions between (meta)stable equilibrium states is observed for soft porous crystals possessing a network with long-range structural order, which can transform between various states upon external stimuli such as pressure, temperature and guest adsorption...
January 15, 2018: Nature Communications
Shamim Akhtar Sufi, Sankar Pajaniradje, Victor Mukherjee, Rukkumani Rajagopalan
Significance - Efficient targeted therapy with minimal side effects is the need of the hour.. Locally altered redox state is observed in several human ailments, such as inflammation, sepsis, and cancer. This has been taken advantage in designing redox-responsive nano-drug carriers. Redox-responsive nanosystems open a door to multitude of possibilities for the control of diseases over other drug delivery systems. Recent Advances -The first generation nanotherapy relies on novel properties of nanomaterials to shield the drug and deliver it to the diseased tissue or organ...
January 15, 2018: Antioxidants & Redox Signaling
Zhaoyang Wang, Xiao Cheng, Anjun Qin, Haoke Zhang, Jing Zhi Sun, Ben Zhong Tang
Luminescent molecules with aggregation-induced emission (AIE) property, or AIE-gens are typical stimuli-responsive materials and many AIE-gens have shown luminescent responses to mechano-, thermo-, electro-, vapo- and/or solvato-stimulus, but the detailed structure-property relationship has been addressed for only few of them. Here, we report a tetraphenylethene (TPE) derivative with pyridyl modifiers and ethynylene bridges. The (Z)- and (E)-isomers are clearly purified and both of them are AIE-active and demonstrate multiple luminescent responses to external stimuli...
January 15, 2018: Journal of Physical Chemistry. B
Gengsheng Weng, Srinivas Thanneeru, Jie He
New fluorochromic materials that reversibly change their emission properties in response to their environment are of interest for the development of sensors and light-emitting materials. A new design of Eu-containing polymer hydrogels showing fast self-healing and tunable fluorochromic properties in response to five different stimuli, including pH, temperature, metal ions, sonication, and force, is reported. The polymer hydrogels are fabricated using Eu-iminodiacetate (IDA) coordination in a hydrophilic poly(N,N-dimethylacrylamide) matrix...
January 15, 2018: Advanced Materials
Shaowei Shi, Xubo Liu, Yanan Li, Xuefei Wu, Dong Wang, Joe Forth, Thomas P Russell
Using the interfacial jamming of cellulose nanocrystal (CNC) surfactants, a new concept, termed all-liquid molding, is introduced to produce all-liquid objects that retain the shape and details of the mold with high fidelity, yet remain all liquid and are responsive to external stimuli. This simple process, where the viscosity of the CNC dispersion can range from that of water to a crosslinked gel, opens tremendous opportunities for encapsulation, delivery systems, and unique microfluidic devices. The process described is generally applicable to any functionalized nanoparticles dispersed in one liquid and polymer ligands having complementary functionality dissolved in a second immiscible liquid...
January 15, 2018: Advanced Materials
Ana P C Almeida, João P Canejo, Susete N Fernandes, Coro Echeverria, Pedro L Almeida, Maria H Godinho
Nature has been producing cellulose since long before man walked the surface of the earth. Millions of years of natural design and testing have resulted in cellulose-based structures that are an inspiration for the production of synthetic materials based on cellulose with properties that can mimic natural designs, functions, and properties. Here, five sections describe cellulose-based materials with characteristics that are inspired by gratings that exist on the petals of the plants, structurally colored materials, helical filaments produced by plants, water-responsive materials in plants, and environmental stimuli-responsive tissues found in insects and plants...
January 15, 2018: Advanced Materials
Qi Tang, Bing Yu, Lilong Gao, Hailin Cong, Na Song, Chenghao Lu
Conventional drugs used for cancer chemotherapy have severe toxic side effects and show individually varied therapeutic responses. The convergence of nanotechnology, biology, material science and pharmacy offers a perspective strategy for cancer chemotherapy. Nanoparticles loaded with anti-cancer drug have been designed to overcome the limitations associated with conventional drugs, several nanomedicines have been approved by FDA and shown good performances in clinical practice. However, the therapeutic efficacies cannot be enhanced...
January 10, 2018: Current Medicinal Chemistry
Jinyang Zhao, Yongli Yan, Cong Wei, Wei Zhang, Zhenhua Gao, Yong Sheng Zhao
Miniaturized lasers with high spectra purity and switchable output are of crucial importance for various ultracompact photonic devices. However, it still remains a great challenge to simultaneously control the wavelength and mode purity of microscale lasers due to the insensitive response of traditional materials to external stimuli. In this work, we propose a strategy to realize switchable single-mode microlasers in perovskite microwires (MWs) coupled with responsive organic microdisk cavities. The perovskite MW therein serves as an excellent laser source to deliver multiple lasing modes, while the microdisk functions as a spectral filter to achieve single-mode outcoupling...
January 11, 2018: Nano Letters
Amy Tsui-Chi Lam, Stanislav Tsitkov, Yifei Zhang, Henry Hess
Biological materials and systems often dynamically self-assemble and disassemble, forming temporary structures as needed and allowing for dynamic responses to stimuli and changing environmental conditions. However, this dynamic interplay of localized component recruitment and release has been difficult to achieve in artificial molecular-scale systems, which are usually designed to have long-lasting, stable bonds. Here, we report the experimental realization of a molecular-scale system that dynamically assembles and disassembles its building blocks while retaining functionality...
January 10, 2018: Nano Letters
Guanjun Chang, Li Yang, Junxiao Yang, Mark P Stoykovich, Deng Xu, Jiaxi Cui, Dapeng Wang
Supramolecular chemistry has provided versatile and affordable solutions for the design of intelligent soft materials, but it cannot be applied in stiff materials. This paper describes a new concept for the design of high-performance supramolecular thermosets by using the noncovalent cation-π interaction as cross-linking. These supramolecular thermosets are a class of infusible and insoluble stiff polymers having excellent mechanical properties even at temperatures exceeding 300 °C. The cation-π interaction can be locally and reversibly installed and removed by aqueous treatments at high or low pH, respectively...
January 5, 2018: Advanced Materials
Zhenhui Qi, Leonard Chiappisi, Hanlin Gong, Ren Pan, Ning Cui, Yan Ge, Christoph Boettcher, Shengyi Dong
The chemistry of aqueous salt solutions is rich with ambiguities, especial in stimuli-responsive supramolecular systems. Rational use of ion specificity to design supramolecular responsive materials, however, is usually off the beaten track from mainstream of supramolecular chemistry and remains a challenging task. We here developed a low- molecular-weight supramolecular system in order to reveal the underlying systematic relationship between ions, water, and solutes. By utilizing those water-attenuated supramolecular forces (with Ka only ~30 M-1), we demonstrated an alternative concept for fabricating aqueous responsive system in ionic medium...
January 5, 2018: Chemistry: a European Journal
Hajime Shigemitsu, Takahiro Fujisaku, Wataru Tanaka, Ryou Kubota, Saori Minami, Kenji Urayama, Itaru Hamachi
Novel soft materials should comprise multiple supramolecular nanostructures whose responses (for example, assembly and disassembly) to external stimuli can be controlled independently. Such multicomponent systems are present in living cells and control the formation and break-up of a variety of supramolecular assemblies made of proteins, lipids, DNA and RNA in response to external stimuli; however, artificial counterparts are challenging to make. Here, we present a hybrid hydrogel consisting of a self-sorting double network of nanofibres in which each network responds to an applied external stimulus independent of the other...
January 8, 2018: Nature Nanotechnology
Patricia Losada-Pérez, Ozge Polat, Atul N Parikh, Erkin Seker, Frank Uwe Renner
Nanoporous gold (np-Au) is a nanostructured metal with many desirable attributes. Despite the growing number of applications of nanoporous materials, there are still open questions regarding their fabrication and subsequent surface functionalization. For example, the hydrophobic nature of gold surfaces makes the formation of planar supported lipid layers challenging. Here, the authors engineer the interface between np-Au and 1,2-dioleoyl-sn-glycero-3-phosphocholine lipid layers using well-differentiated approaches based on vesicle adsorption and solvent exchange methods...
January 5, 2018: Biointerphases
Fan Xu, Huihai Zhong, Ya Chang, Dongdong Li, Hongyue Jin, Meng Zhang, Huiyuan Wang, Chen Jiang, Youqing Shen, Yongzhuo Huang
Chemoresistance remains a formidable hurdle against cancer therapy. Seeking for novel therapy strategies is an urgent need for those who no longer benefit from chemotherapy. Chemoresistance is usually associated with the dysfunction of intrinsic apoptosis. Targeting extrinsic apoptosis via TRAIL signaling and the death receptors could be a potential solution to treat chemoresistant cancer. A highly biocompatible nano system for codelivery of the TRAIL DNA and the death receptor sensitizer monensin was developed, in which low-molecular-weight PEI (LMW-PEI) was crosslinked by the sulfhydryl cyclodextrin via disulfide bonds, and then bound with DNA, thus forming the bioreducible polyplex cores...
December 22, 2017: Biomaterials
Jakob Fink, Frederike Buchta, Cornelia Exner
In the present study, attentional bias was investigated as a potential predisposing mechanism for the contamination-related subtype of obsessive-compulsive disorder (C-OC disorder). Fifty healthy participants with varying degrees of subclinical C-OC symptoms performed a visual search task to measure differential attentional biases elicited by neutral, disgust-, and fear-specific pictorial material. Participants had to find a target picture within five neutral distractor pictures randomly presented on different locations in an array...
January 5, 2018: Cognition & Emotion
Maohua Quan, Bowen Yang, Jingxia Wang, Haifeng Yu, Xinyu Cao
The paper presents a simultaneous microscopic structure characteristic of shape memory Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) inverse opals together with a bulk PVDF-HFP by SEM. The materials show thermo-sensitive micro-shape-memory property, accompanying with a reversible and modulated optical property. The introduction of the inverse opal structure into the SMP material render a recognition ability of micro-structure change aroused from complex environmental signals by optical signal, the micro-structure change can be simultaneously detected by SEM...
January 5, 2018: ACS Applied Materials & Interfaces
Jianzhong Jiang, Qianqian Xu, Guozheng Wang, Zhenggang Cui
Stimulus-responsive surfactant wormlike micelles have been widely investigated in the past decade. In this article, we report light and CO2/N2 dual stimuli-responsive wormlike micelles using a zwitterionic surfactant (SDAP) and an azobenzene surfactant (C4AzoC6N). In contrast to traditional amine-containing wormlike micelles, a fast and reversible CO2-triggered thinning behavior was observed. The system can also be reversibly switched by UV irradiation. The dual stimuli-responsive wormlike micelles (C4AzoC6N-SDAP) may have applications in the development of functional materials for microfluidics and analytical chemistry...
January 5, 2018: Soft Matter
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