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https://www.readbyqxmd.com/read/28817282/tnf-induced-switching-of-columnar-rectangular-to-hexagonal-assemblies-in-a-new-class-of-triphenylene-based-room-temperature-discotic-liquid-crystals
#1
Monika Gupta, Santosh Prasad Gupta, Santanu Kumar Pal
A straightforward synthesis of triphenylene-based oligomeric systems that self-organize into room temperature columnar structures is presented. The compounds with longer spacer length (m = 10 and 12) exhibit columnar rectangular (Colr) mesophase whereas the compound with m = 8 exists in glassy Colr state. Interestingly, the Colr self-assembly of these compounds switches to columnar hexagonal (Colh) on doping the compounds with 2, 4, 7-trinitrofluorenone (TNF). For the dopant concentration of 1:1 with respect to native compound, an intermediate transition state between Colr and Colh phase was observed which completely transformed into the hexagonal phase on increasing the concentration to 1:2 (compound: TNF) and afterwards...
August 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28817259/sub-20-nm-stable-micelles-based-on-a-mixture-of-coiled-coils-a-platform-for-controlled-ligand-presentation
#2
JooChuan Ang, Dan Ma, Benson Thomas Jung, Sinan Keten, Ting Xu
Ligand-functionalized, multivalent nanoparticles have been extensively studied for biomedical applications from imaging agents to drug delivery vehicles. However, the ligand cluster size is usually heterogeneous and the local valency is ill-defined. Here, we present a mixed micelle platform hierarchically self-assembled from a mixture of two amphiphilic 3-helix and 4-helix peptide-PEG-lipid hybrid conjugates. We demonstrate that the local multivalent ligand cluster size on the micelle surface can be controlled based on the coiled-coil oligomeric state...
August 17, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28817257/cation-anion-arrangement-patterns-in-self-assembled-pd2l4-and-pd4l8-coordination-cages
#3
Guido H Clever, Philip Punt
Compounds featuring one-dimensional regular arrangements of stacked metal complexes and alternating [cation-anion]∞ sequences have raised considerable interest owing to their peculiar electronic and optical properties as well as guest inclusion capabilities. While traditional ways to realize these structural motifs rely on crystalline compounds, exclusively existing in the solid state, recent progress in the area of metal-mediated supramolecular self-assembly allows for the rational synthesis of structurally well-defined short stretches of stacked metal complexes and cation-anion arrangements...
August 17, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28817256/tailorable-exciton-transport-in-doped-peptide-amphiphile-assemblies
#4
Lee A Solomon, Matthew E Sykes, Yimin A Wu, Richard D Schaller, Gary P Wiederrecht, Harry Christopher Fry
Light-harvesting biomaterials are an attractive target in photovoltaics, photocatalysis, and artificial photosynthesis. Through peptide self-assembly, complex nanostructures can be engineered to study the role of chromophore organization during light absorption and energy transport. To this end, we demonstrate the one-dimensional transport of excitons along naturally occurring, light-harvesting, Zn-protoporphyrin IX chromophores within self-assembled peptide-amphiphile nanofibers. The internal structure of the nanofibers induces packing of the porphyrins into linear chains...
August 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28817147/supramolecular-core-glycoshell-polythiophene-nanodots-for-targeted-imaging-and-photodynamic-therapy
#5
Hai-Hao Han, Chang-Zheng Wang, Yi Zang, Jia Li, Tony D James, Xiao-Peng He
Supramolecular self-assembly between poly(3-hexylthiophene-2,5-diyl) (P3HT), a polymeric material extensively used for optoelectronic devices, and fluorescent glycoprobes produces core-glycoshell theranostic nanodots (glyco-dots) capable of targeted imaging and photodynamic therapy of liver and triple-negative breast cancer cells.
August 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28816404/multivalency-increases-the-binding-strength-of-rgd-peptidomimetic-paclitaxel-conjugates-to-integrin-%C3%AE-v%C3%AE-3
#6
Cesare Gennari, André Raposo Moreira Dias, Arianna Pina, Alberto Dal Corso, Daniela Arosio, Laura Belvisi, Luca Pignataro, Michele Caruso
Herein we report the synthesis of three multimeric RGD peptidomimetic-paclitaxel conjugates featuring a number of αVβ3 integrin ligands ranging from 2 to 4 (compounds 7-9). These constructs were assembled by conjugation of the integrin αVβ3 ligand cyclo[DKP-RGD]-CH2NH2 (2) with paclitaxel (3) via a 2'-carbamate with a self-immolative spacer, the lysosomally cleavable Val-Ala dipeptide linker, a multimeric scaffold, a triazole linkage, and finally a PEG spacer. Two monomeric conjugates (compounds 5-6) were also synthesized as reference compounds...
August 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28816368/one-pot-self-assembly-of-peptide-based-cage-type-nanostructures-using-orthogonal-ligations
#7
Eline Bartolami, Jérémie Knoops, Yannick Bessin, Mathieu Fossépré, Joseph Chamieh, Pascal Dumy, Mathieu Surin, Sebastien Ulrich
The designed arrangement of biomolecular entities within monodisperse nanostructures is an important challenge toward functional biomaterials. We report herein a method for the formation of water-soluble peptide-based cages using orthogonal ligation reactions - acylhydrazone condensation and thiol-maleimide addition. The results show that using pre-organized cyclic peptides and heterobifunctional spacers as building blocks and a set of orthogonal and chemoselective ligation reactions enable cage formation in one-pot from six components and through eight reactions...
August 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28816042/rapid-and-reliable-detection-of-alkaline-phosphatase-by-a-hot-spots-amplification-strategy-based-on-well-controlled-assembly-on-single-nanoparticle
#8
Yi Zeng, Jia-Qiang Ren, Shaokai Wang, Jiaming Mai, Bing Qu, Yan Zhang, Ai-Guo Shen, Jiming Hu
The first appeal of clinical assay is always accurate and rapid. For alkaline phosphatase (ALP) monitoring in medical treatment, a rapid, reliable surface-enhanced Raman scattering (SERS) test kit is designed based on a "hot spots" amplification strategy. Consisting of alkyne-tagged Au nanoparticles (NPs), Ag+, and enzyme substrate, the packaged test kit can achieve one-step clinical assay of ALP in human serum within several minutes, while the operation is simple as it directly inputs the sample into the test kit...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28816036/surface-interface-carrier-transport-modulation-for-constructing-photon-alternative-ultraviolet-detectors-based-on-self-bending-assembled-zno-nanowires
#9
Zhen Guo, Lianqun Zhou, Yuguo Tang, Lin Li, Zhiqi Zhang, Hongbo Yang, Hanbin Ma, Arokia Nathan, Dongxu Zhao
Surface/interface charge carrier generation, diffusion and recombination/transport modulation are especially important in the construction of photodetectors with high-efficiency in the field of nanoscience. In the paper, a kind of ultraviolet (UV) detector is designed based on ZnO nanostructures considering photon-trapping, surface plasmonic resonance (SPR), piezophototronic effect, interface carrier trapping/transport control and collection. Through carefully optimized surface/interface carrier transport modulation, the designed device with detectivity as high as of 1...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28816032/high-order-in-a-self-assembled-iridium-iii-complex-gelator-towards-nanostructured-iro2-thin-films
#10
Francesca Scarpelli, Andreea Ionescu, Iolinda Aiello, Massimo La Deda, Alessandra Crispini, Mauro Ghedini, Elvira Brunelli, Settimio Sesti, Nicolas Godbert
The preparation and characterization of a new metallogelator based on the Ir(III) discrete cyclometallated complex [(ppy)2Ir(bpy)](CH3CH2OCH2CO2) are reported, where H(ppy) is 2-phenylpiridine and bpy is 2,2'-bipyridine, used as ancillary ligand. The compound is able to self-assemble in water in a range of concentrations between 3% and 6 % w/w, creating a luminescent ordered supramolecular gel. The gel and xerogel architectures were investigated through POM, SEM and TEM microscopies coupled with Powder X-Ray Diffraction...
August 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28816007/fluorous-phase-directed-peptide-assembly-affords-nano-peptisomes-capable-of-ultrasound-triggered-cellular-delivery
#11
Scott H Medina, Megan S Michie, Stephen E Miller, Martin J Schnermann, Joel P Schneider
Here, we report the design, synthesis and efficacy of a new class of ultrasound (US)-sensitive self-assembled peptide-based nanoparticle. Peptisomes are prepared via templated assembly of a de novo designed peptide at the interface of fluorinated nanodroplets. Utilizing peptide assembly allows for facile particle synthesis, direct incorporation of bioactive sequences displayed from the particle corona, and the ability to easily encapsulate biologics during particle preparation using a mild solvent exchange procedure...
August 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28815971/topographical-and-electrical-stimulation-of-neuronal-cells-through-microwrinkled-conducting-polymer-biointerfaces
#12
Alberto Bonisoli, Attilio Marino, Gianni Ciofani, Francesco Greco
The development of smart biointerfaces combining multiple functions is crucial for triggering a variety of cellular responses. In this work, wrinkled organic interfaces based on the conducting polymer poly(3,4-ethylene dioxythiophene) doped with poly(styrene sulfonate) are developed with the aim to simultaneously convey electrical and topographical stimuli to cultured cells. The surface wrinkling of thin films on heat-shrink polymer sheets allows for rapid patterning of self-assembled anisotropic topographies characterized by micro/sub-microscale aligned wrinkles...
August 16, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28815866/catalytic-intramolecular-cycloaddition-reactions-using-a-discrete-molecular-architecture
#13
Partha Sarathi Mukherjee, Bijan Roy, Anthonisamy Devaraj, Rupak Saha, Suprita Jharimune, Ki-Whan Chi
A discrete tetragonal tube-shaped complex (MT-1) has been synthesized by coordination-driven self-assembly of a carbazole-based tetraimidazole donor L and a Pd(II) 90° acceptor, viz. [cis-(dppf)Pd(OTf)2] (dppf = diphenylphosphino ferrocene, OTf = CF3SO3-). Complex MT-1 was characterized by multinuclear NMR, ESI-MS and single crystal X-ray diffraction analysis (SCXRD), which showed its symmetrical tetrafacial tube-shaped architecture possessing a large cavity described by four aromatic walls. This coordination cage was successfully utilized as a molecular vessel to perform intramolecular cycloaddition reactions of O-allylated benzylidinebarbituric acid derivatives inside its confined nanospace...
August 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28815793/responsiveness-and-morphology-study-of-dual-stimuli-controlled-supramolecular-polymer
#14
Chenxiao Xiong, Meiran Xie, Ruyi Sun
The synthesis and characterization of a linear supramolecular polymer formed by dual host-guest recognitions is presented. The polymer linked by the orthogonal interactions of azobenzene with β-cyclodextrin and methyl viologen with sulfonatocalix[4]arene is constructed, and the morphology change along with the formation and vanishment of host-guest interaction is investigated. The reversible disassembly-reassembly of the polymer induced by light and the redox process are monitored by UV-vis and cyclic voltammetry, respectively...
August 16, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28815745/recent-developments-in-open-tubular-capillary-electrochromatography-from-2016-2017
#15
REVIEW
Faustino M Tarongoy, Paul R Haddad, Joselito P Quirino
Interest in open-tubular capillary electrochromatography (OT-CEC) continues to thrive because of the inherent advantage of OT-CEC combining the high efficiency of capillary electrophoresis and the high selectivity of high performance liquid chromatography. For the period 2016 to 2017, novel materials have been developed as first-time stationary phases for OT-CEC and are grouped in this review as polymer-based materials, frameworks, nanoparticles, graphene-based materials, and biomaterials. Coating and fabrication methods mostly rely on covalent coating strategies while non-covalent immobilisation strategies like electrostatic assembly are notably still being employed...
August 16, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28814804/a-unique-thermo-induced-gel-to-gel-transition-in-a-ph-sensitive-small-molecule-hydrogel
#16
Hongtao Xie, Mehran Asad Ayoubi, Wensheng Lu, Jide Wang, Jianbin Huang, Wei Wang
For a hydrogel based on a zwitterionic dendritic surfactant, we report an apparently unprecedented reversible temperature-induced gel-to-gel phase transition below the melting point of its alkyl chains, where the supramolecular self-assembly of surfactant molecules underwent a dramatic transformation from low-temperature surfactant bilayers to high-temperature entangled surfactant worm-like micelles.
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28814735/self-assembly-of-ternary-hollow-microspheres-with-strong-wideband-microwave-absorption-and-controllable-microwave-absorption-properties
#17
Qiang Zeng, Ping Chen, Qi Yu, Hai-Rong Chu, Xu-Hai Xiong, Dong-Wei Xu, Qi Wang
In this study, we report a simple and efficient two-step method consisting of water-in-oil (W/O) emulsion technique and subsequent annealing process for synthesizing the hollow reduced graphene oxide microspheres embedded with Co nanoparticles (Air@rGO€Co). The microspheres showed good electromagnetic properties because of the coexistence of magnetic loss and dielectric loss to microwaves. The minimum reflection loss (RLmin) value of S1.5 reaches -68.1 dB at 13.8 GHz with a thickness of 2.2 mm, and the absorption bandwidth (lower than -10 dB) is 7...
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28814149/n-implantation-induce-cytocompatibility-of-shape-controlled-three-dimensional-self-assembly-graphene
#18
Ye Cao, Dejun Li, Mengli Zhao, Huanhuan Gong, Rongxin Wan, Hanqing Gu
AIM: The aim of the present research was to synthesize N(+) implanted 3D self-assembly graphene (N(+)/3D-SGHs) to overcome the weaknesses of graphene (small sizes and poor hydrophilicity) in tissue engineering scaffolds. MATERIALS & METHODS: N(+)/3D-SGHs was achieved by ion implantation on one-step hydrothermal synthesized 3D self-assembly graphene (3D-SGHs), and N(+)/3D-SGHs with different doses of nitrogen ions (1 × 10(16) ions/cm(2), 1 × 10(18) ions/cm(2) and 1 × 10(20) ions/cm(2)), which adjusted by nitrogen ion beam intensity...
August 17, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28813591/on-surface-oligomerization-of-self-terminating-molecular-chains-for-the-design-of-spintronic-devices
#19
Emil Sierda, Mikel Abadia, Jens Brede, Micha Elsebach, Bernhard Bugenhagen, Marc Heinrich Prosenc, Maciej Bazarnik, Roland Wiesendanger
Molecular spintronics is currently attracting a lot of attention due to its great advantages over traditional electronics. A variety of self-assembled molecule-based devices are under development, but studies regarding the reliability of the growth-process remain rare. Here, we present a method to control the length of molecular spintronic chains and to make their terminations chemically inert, thereby suppressing uncontrolled coupling to surface defects. The temperature evolution of chain formation was followed by X-ray photoelectron spectroscopy, to determine optimal growth conditions...
August 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28813590/understanding-the-elementary-steps-in-dna-tile-based-self-assembly
#20
Shuoxing Jiang, Fan Hong, Huiyu Hu, Hao Yan, Yan Liu
Although many models have been developed to guide the design and implementation of DNA tile-based self-assembly systems with increasing complexity, the fundamental assumptions of the models have not been thoroughly tested. To expand the quantitative understanding of DNA tile-based self-assembly and to test the fundamental assumptions of self-assembly models, we investigated DNA tile attachment to preformed "multi-tile" arrays in real time, and obtained the thermodynamic and kinetic parameters of single tile attachment in various sticky end association scenarios...
August 16, 2017: ACS Nano
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