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stimuli responsive materials

Palamarneri Sivaraman Hariharan, Ebrahim M Mothi, Dohyun Moon, Savarimuthu Philip Anthony
Halochromic isoquinoline attached mechanochromic triphenylamine, N-phenyl-N-(4-(quinolin-2-yl)phenyl)benzenamine (PQPBA) and tris(4-(quinolin-2-yl)phenyl)amine (TQPA), smart fluorescent materials exhibit thermo/mechanochromism and tunable solid state fluorescence and their unusual halochromic response in PMMA matrix have been used for fabricating rewritable and self-erasable fluorescent platforms. PQPBA and TQPA showed strong fluorescence in solution (Φf = 0.9290 (PQPBA) and 0.9160 (TQPA)) and moderate solid state fluorescence (Φf = 20 (PQPBA) and 17% (TQPA)...
December 7, 2016: ACS Applied Materials & Interfaces
María José Soler, Carmen Dasí, Juan Carlos Ruiz, Teresa Cervera
This study presents a normative database of Spanish restricted length word stems that provides useful information for the selection of stimuli in memory experiments with Word Stem Completion (WSC) tasks. The database includes indices relative to stems (total baseline completion, priming baseline completion, priming, number of completions, ratio between given and deleted letters, and syllabic structure), and indices relative to characteristics of the words used to obtain the stems (frequency, familiarity, number of meanings, length, number of syllables, arousal, and valence)...
December 6, 2016: Behavior Research Methods
Loris Vallier, Sylvie Cointe, Romaric Lacroix, Amandine Bonifay, Coralie Judicone, Françoise Dignat-George, Hau C Kwaan
Microparticles (MPs) are submicronic vesicles which are formed by budding of the cellular membrane of virtually any cell type in response to cell activation or apoptosis. Both circulating MPs and MPs generated within tissues harbor molecules with a large repertoire of biological activities and transfer material to target cells. Depending on their cellular origin, the stimuli triggering their formation, or their localization, they may participate in the maintenance of organ or vascular homeostasis as well as inducing dysfunction...
December 6, 2016: Seminars in Thrombosis and Hemostasis
Kun Wang, Jiping Yang, Chen Gong, Hao Lu
An amino-terminated poly(propylene glycol)-modified tetraaryl-buta-1,3-diene derivative (TABDAA) was introduced to synthesize polyurethanes with different ratios of soft/hard segments. A mixture of TABDAA and poly(tetrahydrofuran) 1000 as the soft segments was reacted with 4,4-diphenylmethane diisocyanate and 1,4-butanediol as the hard segments in molar ratios of 1 : 2 : 1, 2 : 3 : 1, and 3 : 4 : 1 to give the desired polyurethanes named TMPU-211, TMPU-321 and TMPU-431, respectively...
December 5, 2016: Faraday Discussions
Fátima García, Maarten M J Smulders
This Highlight presents an overview of the rapidly growing field of dynamic covalent polymers. This class of polymers combines intrinsic reversibility with the robustness of covalent bonds, thus enabling formation of mechanically stable, polymer-based materials that are responsive to external stimuli. It will be discussed how the inherent dynamic nature of the dynamic covalent bonds on the molecular level can be translated to the macroscopic level of the polymer, giving access to a range of applications, such as stimuli-responsive or self-healing materials...
November 15, 2016: Journal of Polymer Science. Part A, Polymer Chemistry
Anne-Christin Schöne, Burkhard Schulz, Andreas Lendlein
No abstract text is available yet for this article.
December 2016: Macromolecular Rapid Communications
Yi-Chen Li, Yu Shrike Zhang, Ali Akpek, Su Ryon Shin, Ali Khademhosseini
Four-dimensional (4D) bioprinting, encompassing a wide range of disciplines including bioengineering, materials science, chemistry, and computer sciences, is emerging as the next-generation biofabrication technology. By utilizing stimuli-responsive materials and advanced three-dimensional (3D) bioprinting strategies, 4D bioprinting aims to create dynamic 3D patterned biological structures that can transform their shapes or behavior under various stimuli. In this review, we highlight the potential use of various stimuli-responsive materials for 4D printing and their extension into biofabrication...
December 2, 2016: Biofabrication
Katherine E Washington, Ruvanthi N Kularatne, Vasanthy Karmegam, Michael C Biewer, Mihaela C Stefan
The use of aliphatic polyesters in drug delivery applications has been a field of significant interest spanning decades. Drug delivery strategies have made abundant use of polyesters in their structures owing to their biocompatibility and biodegradability. The properties afforded from these materials provide many avenues for the tunability of drug delivery systems to suit individual needs of diverse applications. Polyesters can be formed in several different ways, but the most prevalent is the ring-opening polymerization of cyclic esters...
December 1, 2016: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
Prabhu Dhasaiyan, Bhagavatula L V Prasad
The current buzzword in science and technology is self-assembly and molecular self-assembly is one of the most prominent fields as far as research in chemical and biological sciences is concerned. Generally, self-assembly of molecules occurs through weak non-covalent interactions like hydrogen bonding, π-π stacking, hydrophobic effects, etc. Inspired by many natural systems consisting of self-assembled structures, scientists have been trying to understand their formation and mimic such processes in the laboratory to create functional "smart" materials, which respond to temperature, light, pH, electromagnetic field, mechanical stress, and/or chemical stimuli...
November 25, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Pariksha J Kondiah, Yahya E Choonara, Pierre P D Kondiah, Thashree Marimuthu, Pradeep Kumar, Lisa C du Toit, Viness Pillay
Biodegradable, stimuli-responsive polymers are essential platforms in the field of drug delivery and injectable biomaterials for application of bone tissue engineering. Various thermo-responsive hydrogels display water-based homogenous properties to encapsulate, manipulate and transfer its contents to the surrounding tissue, in the least invasive manner. The success of bioengineered injectable tissue modified delivery systems depends significantly on their chemical, physical and biological properties. Irrespective of shape and defect geometry, injectable therapy has an unparalleled advantage in which intricate therapy sites can be effortlessly targeted with minimally invasive procedures...
November 21, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Miguel A Soto, Jorge Tiburcio
A main chain poly(crown ether) macromolecule has been cross-linked with a two binding site guest to afford a stimuli-responsive supramolecular polymeric network with pseudo-rotaxane nodes. This network forms gels and films that are responsive to temperature and solvent polarity; however, the materials can be shielded against both effects by transforming the pseudo-rotaxane junctions into rotaxane links, creating a mechanically locked structure.
December 1, 2016: Chemical Communications: Chem Comm
Muhammad Umer Ashraf, Muhammad Ajaz Hussain, Gulzar Muhammad, Muhammad Tahir Haseeb, Sajid Bashir, Syed Zajif Hussain, Irshad Hussain
Current study was designed to investigate micromeritic properties, water absorption capacity, stimuli (pH, ethanol and saline) responsive swelling-deswelling (on-off switching) and controlled drug release from the polysaccharide glucuronoxylan isolated from the seeds of Quince. The water retention capacity of Quince hydrogel (QH) was found admirable. The hydrogel also exhibited privileged swelling in water and basic buffers (pH 6.8 and 7.4) while insignificant swelling in acidic buffer (pH 1.2). The swelling kinetics of QH follows second order...
November 16, 2016: International Journal of Biological Macromolecules
Yanhu Wang, Chaomin Gao, Shenguang Ge, Lina Zhang, Jinghua Yu, Mei Yan
By incorporating the Prussian Blue (PB) electrochromic display as cathode, a solar-driven photoelectrochemical (PEC) cell was constructed through combining sandwich-structured graphite-like carbon nitride (g-C3N4)-Au-branched-titanium dioxide (B-TiO2) nanorods as photoanode for self-powered hydrogen peroxide (H2O2) sensing, which exhibits both direct photoelectrochemical and electrochromic response. The gold nanoparticles (Au NPs) sandwiched between the B-TiO2 nanorods and the g-C3N4 layer served as electron relay as well as plasmonic photosensitizer to enhance the solar-to-chemical energy conversion efficiency...
November 11, 2016: Biosensors & Bioelectronics
Alex Kafkas, Ellen M Migo, Robin G Morris, Michael D Kopelman, Daniela Montaldi, Andrew R Mayes
The specific role of the perirhinal (PRC), entorhinal (ERC) and parahippocampal cortices (PHC) in supporting familiarity-based recognition remains unknown. An fMRI study explored whether these medial temporal lobe (MTL) structures responded in the same way or differentially to familiarity as a function of stimulus type at recognition. A secondary aim was to explore whether the hippocampus responds in the same way to equally strong familiarity and recollection and whether this is influenced by the kind of stimulus involved...
November 16, 2016: Hippocampus
Martin Rohrmeier, Richard Widdess
Musical knowledge is largely implicit. It is acquired without awareness of its complex rules, through interaction with a large number of samples during musical enculturation. Whereas several studies explored implicit learning of mostly abstract and less ecologically valid features of Western music, very little work has been done with respect to ecologically valid stimuli as well as non-Western music. The present study investigated implicit learning of modal melodic features in North Indian classical music in a realistic and ecologically valid way...
November 17, 2016: Cognitive Science
Julia Wang, Jonah A Kaplan, Yolonda L Colson, Mark W Grinstaff
Mechanically-activated delivery systems harness existing physiological and/or externally-applied forces to provide spatiotemporal control over the release of active agents. Current strategies to deliver therapeutic proteins and drugs use three types of mechanical stimuli: compression, tension, and shear. Based on the intended application, each stimulus requires specific material selection, in terms of substrate composition and size (e.g., macrostructured materials and nanomaterials), for optimal in vitro and in vivo performance...
November 14, 2016: Advanced Drug Delivery Reviews
A Stett, U T Eysel
In Germany, about 30,000 to 40,000 people suffer from retinitis pigmentosa (RP), which ultimately results in blindness. The only aid to blind RP patients are retinal implants: These have been under development for several years and have now been approved as a medical product. Retinal implants produce visual perceptions in response to electrical stimulation of the degenerated retina and are useful in the everyday life of blind people. However, the currently achievable quality of vision is such that people with a retinal implant are still legally blind...
November 2016: Klinische Monatsblätter Für Augenheilkunde
Christian Bensing, Marija Mojić, Santiago Gómez-Ruiz, Sandra Carralero, Biljana Dojčinović, Danijela Maksimović-Ivanić, Sanja Mijatović, Goran N Kaluđerović
SBA-15|Sn3, a mesoporous silica-based material (derivative of SBA-15) loaded with an organotin compound Ph3Sn(CH2)3OH (Sn3), possesses improved antitumor potential against the A2780 high-grade serous ovarian carcinoma cell line in comparison to Sn3. It is demonstrated that both the compound and the nanostructured material are internalized by the A2780 cells. A similar mode of action of Sn3 and SBA-15|Sn3 against the A2780 cell line was found. Explicitly, induction of apoptosis, caspase 2, 3, 8 and 9 activation, accumulation of cells in the hypodiploid phase as well as accumulation of ROS were observed...
November 16, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
L Sommerová, E Ondroušková, R Hrstka
Dynamic, punctual and perfectly coordinated cellular response to internal and external stimuli is a crucial prerequisite for adaptation of mammalian cells to all changes that occur during cellular development under physiological conditions. Hijacking this ability is characteristic for tumor cells that are capable to adapt to unfavorable conditions which contribute to the formation and development of cancer during the process of tumor formation and progression. By changing key mechanisms, malignant cells can avoid cell death and thus allow development and spread of the tumor...
2016: Klinická Onkologie: Casopis Ceské a Slovenské Onkologické Spolecnosti
Lei Dai, Ben Nadeau, Xingye An, Dong Cheng, Zhu Long, Yonghao Ni
Dual-function hydrogels, possessing both stimuli-responsive and self-healing properties, have recently attracted attention of both chemists and materials scientists. Here we report a new paradigm using natural polymer (guar gum, GG) and sodium borohydride (NaBH4), for the preparation of silver nanoparticles (AgNPs)-containing smart hydrogels in a simple, fast and economical way. NaBH4 performs as a reducing agent for AgNPs synthesis using silver nitrate (AgNO3) as the precursor. Meanwhile, sodium metaborate (NaBO2) (from NaBH4) behaves as a cross-linking agent between GG molecular chains...
November 7, 2016: Scientific Reports
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