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stimuli responsive materials

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https://www.readbyqxmd.com/read/28435879/fast-moving-soft-electronic-fish
#1
Tiefeng Li, Guorui Li, Yiming Liang, Tingyu Cheng, Jing Dai, Xuxu Yang, Bangyuan Liu, Zedong Zeng, Zhilong Huang, Yingwu Luo, Tao Xie, Wei Yang
Soft robots driven by stimuli-responsive materials have unique advantages over conventional rigid robots, especially in their high adaptability for field exploration and seamless interaction with humans. The grand challenge lies in achieving self-powered soft robots with high mobility, environmental tolerance, and long endurance. We are able to advance a soft electronic fish with a fully integrated onboard system for power and remote control. Without any motor, the fish is driven solely by a soft electroactive structure made of dielectric elastomer and ionically conductive hydrogel...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28433941/self-assembled-dual-responsive-micelles-stabilized-with-protein-for-co-delivery-of-drug-and-sirna-in-cancer-therapy
#2
M R Aji Alex, Chetan Nehate, Srivani Veeranarayanan, D Sakthi Kumar, Ritu Kulshreshtha, Veena Koul
Design of safe and efficient vehicles for the combinatorial delivery of drugs and genetic agents is an emerging requisite for achieving enhanced therapeutic effect in cancer. Even though several nanoplatforms have been explored for the co-delivery of drugs and genetic materials the translation of these systems to clinical phase is still a challenge, mainly due to tedious synthesis procedures, lack of serum stability, inefficient scalability etc. Here in, we report development of reduction and pH sensitive polymeric graft of low molecular weight poly (styrene -alt -maleic anhydride) and evaluation of its efficacy in co-delivering drug and siRNA...
April 17, 2017: Biomaterials
https://www.readbyqxmd.com/read/28424458/light-penetration-coupled-photoisomerization-modeling-for-photodeformation-of-diarylethene-single-crystal-upscaling-isomerization-to-macroscopic-deformation
#3
Muyoung Kim, Jung-Hoon Yun, Maenghyo Cho
Diarylethene is one of the photo-responsive materials that show rapid and reversible changes in their color/electrochemical properties and macroscopic deformations in the crystalline phase by light irradiation. Photoisomerization is the main cause of the photo reactivity of diarylethene, and we established a statistical model based on the density matrix formalism, which predicts quantitative isomerization progress as a population term. The model reflects photo-switching properties of the target molecule, which were characterized by first principle calculations, and external stimulus factors (light irradiation conditions and temperature)...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28419918/internal-shifting-impairments-in-response-to-emotional-information-in-dysphoric-adolescents
#4
Laura Wante, Sven C Mueller, Ineke Demeyer, Tiffany Naets, Caroline Braet
BACKGROUND AND OBJECTIVES: Previous studies have suggested that internal cognitive control impairments may play an important role in the development of depression. Despite a growing body of research in adults, the ability to shift internal attention between mental representations in working memory has received little attention in younger populations. This study investigated internal shifting capacity between emotional and non-emotional information in dysphoric and non-dysphoric adolescents...
April 13, 2017: Journal of Behavior Therapy and Experimental Psychiatry
https://www.readbyqxmd.com/read/28417548/resistive-switching-performance-improvement-via-modulating-nanoscale-conductive-filament-involving-the-application-of-two-dimensional-layered-materials
#5
REVIEW
Yu Li, Shibing Long, Qi Liu, Hangbing Lv, Ming Liu
Reversible chemical and structural changes induced by ionic motion and reaction in response to electrical stimuli leads to resistive switching effects in metal-insulator-metal structures. Filamentary switching based on the formation and rupture of nanoscale conductive filament has been applied in non-volatile memory and volatile selector devices with low power consumption and fast switching speeds. Before the mass production of resistive switching devices, great efforts are still required to enable stable and reliable switching performances...
April 18, 2017: Small
https://www.readbyqxmd.com/read/28414092/numbers-and-functional-lateralization-a-visual-half-field-and-dichotic-listening-study-in-proficient-bilinguals
#6
Michal Klichowski, Gregory Króliczak
Potential links between language and numbers and the laterality of symbolic number representations in the brain are still debated. Furthermore, reports on bilingual individuals indicate that the language-number interrelationships might be quite complex. Therefore, we carried out a visual half-field (VHF) and dichotic listening (DL) study with action words and different forms of symbolic numbers used as stimuli to test the laterality of word and number processing in single-, dual-language and mixed -task and language- contexts...
April 14, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28413070/processing-graspable-object-images-and-their-nouns-is-impaired-in-parkinson-s-disease-patients
#7
Giovanni Buccino, Riccardo Dalla Volta, Gennarina Arabia, Maurizio Morelli, Carmelina Chiriaco, Angela Lupo, Franco Silipo, Aldo Quattrone
According to embodiment, the recruitment of the motor system is necessary to process language material expressing a motor content. Coherently, an impairment of the motor system should affect the capacity to process language items with a motor content. The aim of the present study was to assess the capacity to process graspable objects and their nouns in Parkinson's disease (PD) patients and healthy controls. Participants saw photos and nouns depicting graspable and non-graspable objects. Scrambled images and pseudo-words served as control stimuli...
March 27, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28408049/ultrasound-responsive-nipam-based-hydrogels-with-tunable-profile-of-controlled-release-of-large-molecules
#8
Chueh-Hung Wu, Ming-Kuan Sun, Jay Shieh, Chuin-Shan Chen, Chang-Wei Huang, Chi-An Dai, Shu-Wei Chang, Wen-Shiang Chen, Tai-Horng Young
Episodic release of bioactive compounds plays an important role in biological systems. "On-demand" release systems which based on polymeric materials and activated by external stimuli may provide the necessary functionality. Here we describe an ultrasound-responsive hydrogel based on N-isopropylacrylamide (NIPAM) and N,N'-methylenebisacrylamide (MBAm), which is suitable for triggered release of two large molecules: bovine serum albumin (BSA, 66kDa) and dextran (3-5kDa). It is shown that the release amount of these two large molecules increased with increasing hydrogel temperature, and the application of ultrasound further increased the release...
April 2, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28406626/excimer-monomer-photoluminescence-mechanochromism-and-vapochromism-of-pentiptycene-containing-cyclometalated-platinum-ii-complexes
#9
Che-Jen Lin, Yi-Hung Liu, Shie-Ming Peng, Teruo Shinmyozu, Jye-Shane Yang
The ability of the bulky H-shaped pentiptycene scaffold in promoting the mechanochromic and vapochromic luminescence properties for organometallic materials has been demonstrated with the N^C^N cyclometalated platinum(II) complexes [X-NCNPtY], where X = Br or Pa, the substituent on the terdentate dipyridylbenzene N^C^N ligand, and Y = Cl or Pa, the ancillary ligand, in which Pa = pentiptycene acetylene. Intermolecular interactions between the planar NCNPt cores are described by π-π and d-π interactions with negligible Pt(II)···Pt(II) bonding, corresponding to ligand-centered excimer rather than metal-metal-to-ligand charge-transfer emission, for these platinum(II) complexes in aggregates and in the solid state...
April 13, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28406151/organic-light-emitting-board-for-dynamic-interactive-display
#10
Eui Hyuk Kim, Sung Hwan Cho, Ju Han Lee, Beomjin Jeong, Richard Hahnkee Kim, Seunggun Yu, Tae-Woo Lee, Wooyoung Shim, Cheolmin Park
Interactive displays involve the interfacing of a stimuli-responsive sensor with a visual human-readable response. Here, we describe a polymeric electroluminescence-based stimuli-responsive display method that simultaneously detects external stimuli and visualizes the stimulant object. This organic light-emitting board is capable of both sensing and direct visualization of a variety of conductive information. Simultaneous sensing and visualization of the conductive substance is achieved when the conductive object is coupled with the light emissive material layer on application of alternating current...
April 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/28401659/dynamic-orthogonal-switching-of-a-thermoresponsive-self-organized-helical-superstructure
#11
Lingli Zhang, Ling Wang, Uma S Hiremath, Hari Krishna Bisoyi, Geetha G Nair, Channabasaveshwar V Yelamaggad, Augustine M Urbas, Timothy J Bunning, Quan Li
Controllable manipulation of self-organized dynamic superstructures of functional molecular materials by external stimuli is an enabling enterprise. Herein, we have developed a thermally driven, self-organized helical superstructure, i.e., thermoresponsive cholesteric liquid crystal (CLC), by integrating a judiciously chosen thermoresponsive chiral molecular switch into an achiral liquid crystalline medium. The CLC in lying state, in both planar and twisted nematic cells, exhibits reversible in-plane orthogonal switching of its helical axis in response to the combined effect of temperature and electric field...
April 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28401592/a-niccolite-structural-multiferroic-metal-organic-framework-possessing-four-different-types-of-bistability-in-response-to-dielectric-and-magnetic-modulation
#12
Jiong-Peng Zhao, Jian Xu, Song-De Han, Qing-Lun Wang, Xian-He Bu
Multiple switchable physical properties have been demonstrated in one single niccolite structural metal-organic framework, [(CH3 CH2 )2 NH2 ][Fe(III) Fe(II) (HCOO)6 ] (1), including (i) a reversible ferroelastic phase transition triggered by freezing the disordered (CH3 CH2 )2 NH2(+) cations, (ii) a thermally switchable dielectric constant transition accompanied by phase transition, and (iii) thermal and positive magnetic field driven magnetic poles reversal at low temperatures, attributed to different responses of the magnetization of Fe(II) and Fe(III) sublattices to external stimuli...
April 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28397501/layer-by-layer-assembled-laccase-enzyme-on-stimuli-responsive-membranes-for-chloro-organics-degradation
#13
Rupam Sarma, Md Saiful Islam, Anne-Frances Miller, Dibakar Bhattacharyya
Functionalized membranes provide versatile platforms for the incorporation of biocatalysts and nanostructured materials for efficient and benign environmental remediation. The existing techniques for remediating chloro-organics in water consist of both physical and chemical means mostly using metal oxide-based catalysts, despite associated environmental concerns. To offer bioinspired remediation as an alternative, we herein demonstrate a layer-by-layer approach to immobilize laccase enzyme onto pH-responsive functionalized membranes for the degradation of chloro-organics in water...
April 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28381672/supramolecular-polymeric-materials-containing-cyclodextrins
#14
REVIEW
Masaki Nakahata, Yoshinori Takashima, Akira Harada
Smart design of polymeric materials may lead to intelligent materials exhibiting unique functional properties. Looking at nature, living systems use specific and reversible intermolecular interactions in realizing complex functions. Hence reversible bonds based on selective molecular recognition can impart artificial materials with unique functional properties. This review mainly focuses on supramolecular polymeric materials based on cyclodextrin-based host-guest interactions. Polymeric materials using molecular recognition at polymer main chain, side chain, and termini are described...
2017: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28372810/biofilm-over-teeth-and-restorations-what-do-we-need-to-know
#15
REVIEW
Nancy J Lin
OBJECTIVE: The goal of this manuscript is to provide an overview of biofilm attributes and measurement approaches in the context of studying biofilms on tooth and dental material surfaces to improve oral health. METHODS: A historical perspective and terminology are presented, followed by a general description of the complexity of oral biofilms. Then, an approach to grouping measurable biofilm properties is presented and considered in relation to biofilm-material interactions and material design strategies to alter biofilms...
March 31, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28372302/advance-of-dna-and-ccps-based-nanocarriers-in-drug-delivery-systems
#16
Yu Wu, Xihui Yao, Yun Chen, Yinping Li, Weiqun Tian
Development of smart and functional polymeric carriers, which enable controlled or timed release of a bioactive material, thereby providing a better dosing pattern and minimizing side effects, becomes a new requirement in the field of drug delivery. In the recent few decades, a great many advancements of polymer synthetic methods have led to a new generation of bioactive polymers' applications as drug controlled release carriers. In this review, we focus on the use of bioactive polymers for drug delivery system, with a particular in the utility of DNA-based nanocarriers and cell-penetrating peptides (CCPs)-based nanocarriers to provide precision control for drug targeting or stimuli responsive systems...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28371582/dynamic-sub-10-nm-nanostructured-ultrathin-films-of-sugar-polyolefin-conjugates-thermoresponsive-at-physiological-temperatures
#17
Samantha R Nowak, Wonseok Hwang, Lawrence R Sita
Spin-casting of a cellobiose-atactic polypropene (CB-aPP) conjugate (1) from a 0.1% (w/w) n-butanol/hexane solution onto highly oriented pyrolytic graphite (HOPG) and carbon-coated Si(100) spontaneously produced microphase-separated sub-10-nm nanostructured ultrathin films in the form of alternating CB and aPP lamellar domains (d = 6.60 ± 0.68 nm) that are oriented perpendicular to the substrate surface. Thermal annealing at modest temperatures (e.g., 50-100 °C), and as low as the physiologically relevant temperature of 38 °C, serves to drive a structural transition that yields a parallel stacked bilayer assembly as the thermodynamically favored nanostructure...
April 7, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28370577/selective-dual-channel-imaging-on-cyanostyryl-modified-azulene-systems-with-unimolecularly-tunable-visible-nearinfrared-luminescence
#18
Yunyun Zhou, Liangliang Zhu
Motivated by that tunable multipathway imaging can be advantagedly connected with treatment processes in therapy, we report the integration of an azulene and a cyanostyryl moiety into one skeleton for the generation of in situ stimuli-responsive luminescent materials with the aim to achieve tunable and effective emissions in distinct channels on a single-molecular platform. This strategy takes advantage of 1) the Z/E isomerization of the cyanostyryl unit that can vary the push-pull effect of the substitution on azulene, accompanied by altering absorption and emission of individual excited states, and 2) an optimized excited-state regulation for opening a nearinfrared emissive channel and making up for a controllable dual-pathway luminescent system together with the utilization of visible emission...
March 29, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28370503/switching-thin-films-of-azobenzene-containing-metal-organic-frameworks-with-visible-light
#19
Kai Müller, Alexander Knebel, Fangli Zhao, David Bléger, Jürgen Caro, Lars Heinke
Stimuli-responsive molecules change their properties when exposed to external signals, such as light, and enable the preparation of smart materials. UV light, which often destroys organic materials, is typically required for activating the desired response of photoswitchable compounds, significantly limiting the potential applications of light-operated smart materials. Herein, we present the first metal-organic framework (MOF), which enables reversible modulation of key properties upon irradiation with visible light only...
April 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28367117/representation-of-glossy-material-surface-in-ventral-superior-temporal-sulcal-area-of-common-marmosets
#20
Naohisa Miyakawa, Taku Banno, Hiroshi Abe, Toshiki Tani, Wataru Suzuki, Noritaka Ichinohe
The common marmoset (Callithrix jacchus) is one of the smallest species of primates, with high visual recognition abilities that allow them to judge the identity and quality of food and objects in their environment. To address the cortical processing of visual information related to material surface features in marmosets, we presented a set of stimuli that have identical three-dimensional shapes (bone, torus or amorphous) but different material appearances (ceramic, glass, fur, leather, metal, stone, wood, or matte) to anesthetized marmoset, and recorded multiunit activities from an area ventral to the superior temporal sulcus (STS) using multi-shanked, and depth resolved multi-electrode array...
2017: Frontiers in Neural Circuits
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