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stimuli responsive materials

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https://www.readbyqxmd.com/read/28221001/synthesis-of-dual-stimuli-responsive-microcontainers-with-two-payloads-in-different-storage-spaces-for-preprogrammable-release
#1
Ying Cong, Qiuju Li, Min Chen, Limin Wu
Stimuli-responsive microcontainers have become a major topic of interest, from fundamental aspects to applications in materials science. However, microcontainers that enable the loading of multiple species and programmable release are mostly unexplored. Herein, we describe the design and synthesis of a dual-responsive organic/inorganic hybrid microcontainer with two payloads in separate storage spaces that is formed by the rapid UV-initiated polymerization of Pickering emulsions. The stellate mesopore silica nanoparticles with poly(N-isopropylacrylamide) grafted inside the mesopores were loaded with one compound (Nile red) and used as Pickering emulsifiers to stabilize oil-in-water droplets...
February 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28214544/can-functional-magnetic-resonance-imaging-studies-help-with-the-optimization-of-health-messaging-for-lifestyle-behavior-change-a-systematic-review
#2
REVIEW
Maxine E Whelan, Paul S Morgan, Lauren B Sherar, Mark W Orme, Dale W Esliger
Unhealthy behaviors, including smoking, poor nutrition, excessive alcohol consumption, physical inactivity and sedentary lifestyles, are global risk factors for non-communicable diseases and premature death. Functional magnetic resonance imaging (fMRI) offers a unique approach to optimize health messages by examining how the brain responds to information relating to health. Our aim was to systematically review fMRI studies that have investigated variations in brain activation in response to health messages relating to (i) smoking; (ii) alcohol consumption; (iii) physical activity; (iv) diet; and (v) sedentary behavior...
February 15, 2017: Preventive Medicine
https://www.readbyqxmd.com/read/28198589/synthesis-and-characterization-of-stimuli-responsive-star-like-polypept-o-ides-introducing-biodegradable-peptostars
#3
Regina Holm, Benjamin Weber, Philipp Heller, Kristina Klinker, Dana Westmeier, Dominic Docter, Roland H Stauber, Matthias Barz
Star-like polymers are one of the smallest systems in the class of core crosslinked polymeric nanoparticles. This article reports on a versatile, straightforward synthesis of three-arm star-like polypept(o)ide (polysarcosine-block-polylysine) polymers, which are designed to be either stable or degradable at elevated levels of glutathione. Polypept(o)ides are a recently introduced class of polymers combining the stealth-like properties of the polypeptoid polysarcosine with the functionality of polypeptides, thus enabling the synthesis of materials completely based on endogenous amino acids...
February 15, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28198148/stimuli-responsive-liposomes-for-drug-delivery
#4
REVIEW
Y Lee, D H Thompson
The ultimate goal of drug delivery is to increase the bioavailability and reduce the toxic side effects of the active pharmaceutical ingredient (API) by releasing them at a specific site of action. In the case of antitumor therapy, association of the therapeutic agent with a carrier system can minimize damage to healthy, nontarget tissues, while limit systemic release and promoting long circulation to enhance uptake at the cancerous site due to the enhanced permeation and retention effect (EPR). Stimuli-responsive systems have become a promising way to deliver and release payloads in a site-selective manner...
February 15, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28198107/fluorescent-supramolecular-polymeric-materials
#5
REVIEW
Hu Wang, Xiaofan Ji, Zhengtao Li, Feihe Huang
Fluorescent supramolecular polymeric materials are rising stars in the field of fluorescent materials not only because of the inherent optoelectronic properties originating from their chromophores, but also due to the fascinating stimuli-responsiveness and reversibility coming from their noncovalent connections. Especially, these noncovalent connections influence the fluorescence properties of the chromophores because their state of aggregation and energy transfer can be regulated by the assembly-disassembly process...
February 15, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28194746/stimuli-responsive-polymeric-nanocarriers-for-efficient-gene-delivery
#6
REVIEW
Yingqin Li, Jinbiao Gao, Chao Zhang, Zhong Cao, Du Cheng, Jie Liu, Xintao Shuai
Gene therapy provides an alternative and effective method for treatment of genetic diseases and cancers that are refractory to conventional therapeutics. The success of gene therapy is largely dependent on the development of safe and effective gene delivery vectors for transporting genetic material from the blood stream to the cytoplasm or nucleus. Current gene vectors can be divided into viral and non-viral vectors. Although non-viral gene delivery carriers can offer some advantages, such as safety and facile fabrication, they do not possess the same high gene transfection efficiency as viral vectors due to a lack of functionality to overcome extra- and intracellular gene delivery obstacles...
April 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28191922/synergistic-integration-of-experimental-and-simulation-approaches-for-the-de-novo-design-of-silk-based-materials
#7
Wenwen Huang, Davoud Ebrahimi, Nina Dinjaski, Anna Tarakanova, Markus J Buehler, Joyce Y Wong, David L Kaplan
Tailored biomaterials with tunable functional properties are crucial for a variety of task-specific applications ranging from healthcare to sustainable, novel bio-nanodevices. To generate polymeric materials with predictive functional outcomes, exploiting designs from nature while morphing them toward non-natural systems offers an important strategy. Silks are Nature's building blocks and are produced by arthropods for a variety of uses that are essential for their survival. Due to the genetic control of encoded protein sequence, mechanical properties, biocompatibility, and biodegradability, silk proteins have been selected as prototype models to emulate for the tunable designs of biomaterial systems...
February 13, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28191565/diverse-macroscopic-helical-motions-of-microribbons-driven-by-electrons
#8
Cheng Peng, Yifan Zhang, Yibin Zhang, Zichao Zhou, Yanke Che, Jincai Zhao
Novel stimuli-responsive microscale materials capable of undergoing diverse out-of-plane helical motions (e.g., bending, twisting and coiling) when exposed to electron irradiation are reported. The macroscopic morphological changes of microribbons induced by electrons arise from the combination of diagonal in-plane, non-bonded distortion relative to the long axis of the microribbon and vertical non-bonded distortion.
February 13, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28186723/bioresponsive-dna-hydrogels-beyond-the-conventional-stimuli-responsiveness
#9
Dong Wang, Yue Hu, Peifeng Liu, Dan Luo
Bioresponsive hydrogels can respond to various biological stimuli by a macroscopic change of physical state or by converting biochemical inputs into biological or mechanical outputs. These materials are playing an increasingly important role in a wide variety of applications, especially in the biological and biomedical fields. However, the design and engineering of intriguing bioresponsive materials with adequate biocompatibility and biodegradability have proven to be a great challenge. DNA, on the other hand, possesses many unique and fascinating properties, including its indispensable genetic function, broad biocompatibility, precise molecular recognition capability, tunable multifunctionality, and convenient programmability...
February 10, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28186408/functional-microgels-and-microgel-systems
#10
Felix A Plamper, Walter Richtering
Microgels are macromolecular networks swollen by the solvent in which they are dissolved. They are unique systems that are distinctly different from common colloids, such as, e.g., rigid nanoparticles, flexible macromolecules, micelles, or vesicles. The size of the microgel networks is in the range of several micrometers down to nanometers (then sometimes called "nanogels"). In a collapsed state, they might resemble hard colloids but they can still contain significant amounts of solvent. When swollen, they are soft and have a fuzzy surface with dangling chains...
February 10, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28181831/basic-concepts-and-recent-advances-in-nanogels-as-carriers-for-medical-applications
#11
Iordana Neamtu, Alina Gabriela Rusu, Alina Diaconu, Loredana Elena Nita, Aurica P Chiriac
Nanogels in biomedical field are promising and innovative materials as dispersions of hydrogel nanoparticles based on crosslinked polymeric networks that have been called as next generation drug delivery systems due to their relatively high drug encapsulation capacity, uniformity, tunable size, ease of preparation, minimal toxicity, stability in the presence of serum, and stimuli responsiveness. Nanogels show a great potential in chemotherapy, diagnosis, organ targeting and delivery of bioactive substances...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28181798/shape-morphing-materials-from-stimuli-responsive-hydrogel-hybrids
#12
Seog-Jin Jeon, Adam W Hauser, Ryan C Hayward
The formation of well-defined and functional three-dimensional (3D) structures by buckling of thin sheets subjected to spatially nonuniform stresses is common in biological morphogenesis and has become a subject of great interest in synthetic systems, as such programmable shape-morphing materials hold promise in areas including drug delivery, biomedical devices, soft robotics, and biomimetic systems. Given their ability to undergo large changes in swelling in response to a wide variety of stimuli, hydrogels have naturally emerged as a key type of material in this field...
February 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28181795/water-responsive-shape-recovery-induced-buckling-in-biodegradable-photo-cross-linked-poly-ethylene-glycol-peg-hydrogel
#13
Abhijit Vijay Salvekar, Wei Min Huang, Rui Xiao, Yee Shan Wong, Subbu S Venkatraman, Kiang Hiong Tay, Ze Xiang Shen
The phenomenon of recovering the permanent shape from a severely deformed temporary shape, but only in the presence of the right stimulus, is known as the shape memory effect (SME). Materials with such an interesting effect are known as shape memory materials (SMMs). Typical stimuli to trigger shape recovery include temperature (heating or cooling), chemical (including water/moisture and pH value), and light. As a SMM is able not only to maintain the temporary shape but also to respond to the right stimulus when it is applied, via shape-shifting, a seamless integration of sensing and actuation functions is achieved within one single piece of material...
February 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28180218/frontiers-in-poly-ionic-liquid-s-syntheses-and-applications
#14
REVIEW
Wenjing Qian, John Texter, Feng Yan
We review recent works on the synthesis and application of poly(ionic liquid)s (PILs). Novel chemical structures, different synthetic strategies and controllable morphologies are introduced as a supplement to PIL systems already reported. The primary properties determining applications, such as ionic conductivity, aqueous solubility, thermodynamic stability and electrochemical/chemical durability, are discussed. Furthermore, the near-term applications of PILs in multiple fields, such as their use in electrochemical energy materials, stimuli-responsive materials, carbon materials, and antimicrobial materials, in catalysis, in sensors, in absorption and in separation materials, as well as several special-interest applications, are described in detail...
February 20, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28174774/bipyridine-based-metallogels-an-unprecedented-difference-in-photochemical-and-chemical-reduction-in-the-in-situ-nanoparticle-formation
#15
Rajendhraprasad Tatikonda, Kia Bertula, Nonappa, Sami Hietala, Kari Rissanen, Matti Haukka
Metal co-ordination induced supramolecular gelation of low molecular weight organic ligands is a rapidly expanding area of research due to the potential in creating hierarchically self-assembled multi-stimuli responsive materials. In this context, structurally simple O-methylpyridine derivatives of 4,4'-dihydroxy-2,2'-bipyridine ligands are reported. Upon complexation with Ag(i) ions in aqueous dimethyl sulfoxide (DMSO) solutions the ligands spontaneously form metallosupramolecular gels at concentrations as low as 0...
February 8, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28170219/on-demand-dissolution-of-chemically-cross-linked-hydrogels
#16
Marlena D Konieczynska, Mark W Grinstaff
The formation and subsequent on-demand dissolution of chemically cross-linked hydrogels is of keen interest to chemists, engineers, and clinicians. In this Account, we summarize our recent advances in the area of dissolvable chemically cross-linked hydrogels and provide a comparative discussion of other recent hydrogel systems. Using biocompatible macromonomers, we developed a library of cross-linked dendritic hydrogels that possess favorable properties, including biocompatibility, tissue adhesion, and swelling...
February 7, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28169527/molecular-biodynamers-dynamic-covalent-analogues-of-biopolymers
#17
Yun Liu, Jean-Marie Lehn, Anna K H Hirsch
Constitutional dynamic chemistry (CDC) features the use of reversible linkages at both molecular and supramolecular levels, including reversible covalent bonds (dynamic covalent chemistry, DCC) and noncovalent interactions (dynamic noncovalent chemistry, DNCC). Due to its inherent reversibility and stimuli-responsiveness, CDC has been widely utilized as a powerful tool for the screening of bioactive compounds, the exploitation of receptors or substrates driven by molecular recognition, and the fabrication of constitutionally dynamic materials...
February 7, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28168216/strain-and-vector-magnetic-field-tuning-of-the-anomalous-phase-in-sr3ru2o7
#18
Daniel O Brodsky, Mark E Barber, Jan A N Bruin, Rodolfo A Borzi, Santiago A Grigera, Robin S Perry, Andrew P Mackenzie, Clifford W Hicks
A major area of interest in condensed matter physics is the way electrons in correlated electron materials can self-organize into ordered states, and a particularly intriguing possibility is that they spontaneously choose a preferred direction of conduction. The correlated electron metal Sr3Ru2O7 has an anomalous phase at low temperatures that features strong susceptibility toward anisotropic transport. This susceptibility has been thought to indicate a spontaneous anisotropy, that is, electronic order that spontaneously breaks the point-group symmetry of the lattice, allowing weak external stimuli to select the orientation of the anisotropy...
February 2017: Science Advances
https://www.readbyqxmd.com/read/28159717/generation-of-anti-inflammatory-macrophages-for-implants-and-regenerative-medicine-using-self-standing-release-systems-with-a-phenotype-fixing-cytokine-cocktail-formulation
#19
Vladimir Riabov, Fabián Salazar, Su Su Htwe, Alexandru Gudima, Christina Schmuttermaier, Julien Barthes, Helena Knopf-Marques, Harald Klüter, Amir M Ghaemmaghami, Nihal Engin Vrana, Julia Kzhyshkowska
: The immediate tissue microenvironment of implanted biomedical devices and engineered tissues is highly influential on their long term fate and efficacy. The creation of a long-term anti-inflammatory microenvironment around implants and artificial tissues can facilitate their integration. Macrophages are highly plastic cells that define the tissue reactions on the implanted material. Local control of macrophage phenotype by long-term fixation of their healing activities and suppression of inflammatory reactions are required to improve implant acceptance...
February 1, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28151662/logic-controlled-radical-polymerization-with-heat-and-light-multiple-stimuli-switching-of-polymer-chain-growth-via-a-recyclable-thermally-responsive-gel-photoredox-catalyst
#20
Mao Chen, Shihong Deng, Yuwei Gu, Jun Lin, Michelle J MacLeod, Jeremiah A Johnson
Strategies for switching polymerizations between "ON" and "OFF" states offer new possibilities for materials design and fabrication. While switching of controlled radical polymerization has been achieve using light, applied voltage, allosteric effects, chemical reagents, pH, and mechanical force, it is still challenging to introduce multiple external switches using the same catalyst to achieve logic gating of controlled polymerization reactions. Herein, we report an easy-to-synthesize thermally responsive organo-/hydro-gel that features covalently bound 10-phenylphenothiazine (PTH)...
February 2, 2017: Journal of the American Chemical Society
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