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https://www.readbyqxmd.com/read/28806662/porous-co2p-nanowires-as-high-efficient-bifunctional-catalysts-for-4-nitrophenol-reduction-and-sodium-borohydride-hydrolysis
#1
Xingkai Huang, Dengfeng Wu, Daojian Cheng
The development of highly efficient and non-noble catalysts for both the reduction of 4-nitrophenol (4-NP) and NaBH4 hydrolysis is extraordinary attractive but it remains a tremendous challenge. In this work, self-assembled porous Co2P nanowires (NWs) have been successfully prepared via the low-temperature hydrothermal method and the comprehensive experiments validate that the sample is a high efficient bifunctional catalyst for both the reduction of 4-nitrophenol and sodium borohydride hydrolysis. Specifically, the as-prepared porous Co2P NWs exhibit more excellent catalytic performance (knor=743s(-1)g(-1)) than that of other reported catalysts towards reduction of 4-nitrophenol...
August 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28806528/surface-adaptive-gold-nanoparticles-with-effective-adherence-and-enhanced-photothermal-ablation-of-methicillin-resistant-staphylococcus-aureus-biofilm
#2
Dengfeng Hu, Huan Li, Bailiang Wang, Zi Ye, Wenxi Lei, Fan Jia, Qiao Jin, Ke-Feng Ren, Jian Ji
Biofilms which contribute to the persistent bacterial infections pose serious threats to global public health, mainly due to their resistance to antibiotics penetration and escaping innate immune attacks by phagocytes. Here, we report a kind of surface-adaptive gold nanoparticles (AuNPs) exhibiting (1) self-adaptive target to the acidic microenvironment of biofilm, (2) enhanced photothermal ablation of methicillin-resistant Staphylococcus aureus (MRSA) biofilm under near-infrared (NIR) light irradiation and (3) no damage to the healthy tissues around biofilm...
August 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/28806527/a-2d-substitutional-solid-solution-through-hydrogen-bonding-of-molecular-building-blocks
#3
Jennifer M Macleod, Josh Lipton-Duffin, Chaoying Fu, Tyler Taerum, Dmitrii F Perepichka, Federico Rosei
Two-dimensional (2D) molecular self-assembly allows for the formation of well-defined supramolecular layers with tailored geometrical, compositional and chemical properties. To date, random intermixing and entropic effects in these systems have largely been associated with crystalline disorder and glassy phases. Here we describe a 2D crystalline self-assembled molecular system that exhibits random incorporation of substitutional molecules. The lattice is formed from a mixture of trimesic acid (TMA) and terthienobenzenetricarboxylic acid (TTBTA), C3-symmetric hydrogen-bonding units of very different sizes (0...
August 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/28806476/dna-trojan-horses-the-self-assembled-floxuridine-containing-dna-polyhedra-for-cancer-therapy
#4
Quanbing Mou, Yuan Ma, Gaifang Pan, Bai Xue, Deyue Yan, Chuan Zhang, Xinyuan Zhu
Based on the structural similarity, herein, nucleoside analogue therapeutics were integrated into DNA strands through conventional solid-phase synthesis. By elaborately designing their sequences, floxuridine-integrated DNA strands were synthesized and self-assembled into well-defined DNA polyhedra with definite drug loading ratio as well as tunable size and morphology. As a novel drug delivery system, these drug-containing DNA polyhedra could ideally mimic the Trojan Horse to deliver chemotherapeutics into tumor cells and fight against cancer...
August 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28806061/construction-of-a-polyhedral-dna-12-arm-junction-for-self-assembly-of-wireframe-dna-lattices
#5
Ilenia Manuguerra, Guido Grossi, Rasmus P Thomsen, Jeppe Lyngsø, Jan Skov Pedersen, Jørgen Kjems, Ebbe Sloth Andersen, Kurt Vesterager Gothelf
A variety of different tiles for the construction of DNA lattices have been developed since the structural DNA nanotechnology field was born. The majority of these are designed for the realization of close-packed structures where DNA helices are arranged in parallel and tiles are connected through sticky ends. Assembly of such structures requires to the use of cation rich buffers to minimize repulsion between parallel helices, which poses limits to the application of DNA nanostructures. Wireframe structures on the other hand are less susceptible to salt concentration, but the assembly of wireframe lattices is limited by the availability of tiles and 2 motifs...
August 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/28805867/coumarin-containing-thermoresponsive-hyaluronic-acid-based-nanogels-as-delivery-systems-for-anticancer-chemotherapy
#6
Talitha F Stefanello, Benoit Couturaud, Anna Szarpak-Jankowska, David Fournier, Benoit Louage, Francielle P Garcia, Celso V Nakamura, Bruno G De Geest, Patrice Woisel, Boudewijn van der Sanden, Rachel Auzély-Velty
Multi-stimuli responsive nanogels based on biocompatible hydrophilic polymers have emerged as promising drug delivery systems to improve anticancer therapy with hydrophobic drugs, through increase of circulating-time in the bloodstream, tumor-targeting and reduction of systemic toxicity. This paper reports on the synthesis, characterization and biological perspectives of light- and thermoresponsive hyaluronic acid (HA)-based nanogels containing coumarin as the photocleavable group. Newly synthesized nanogels exhibited interesting features: formation by a temperature-triggered self-assembly process, successful incorporation of poorly water-soluble molecules, light-responsiveness as demonstrated by a significant shift in the critical aggregation temperature after light irradiation, efficient internalization by cancer cells overexpressing the CD44 receptor of HA, ability to circulate for a prolonged period of time in the bloodstream after intravenous injection in mice and considerable detection in tumor tissues...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28805396/transport-properties-of-a-two-dimensional-pbse-square-superstructure-in-an-electrolyte-gated-transistor
#7
Maryam Alimoradi Jazi, Vera A E C Janssen, Wiel H Evers, Athmane Tadjine, Christophe Delerue, Laurens D A Siebbeles, Herre S J van der Zant, Arjan J Houtepen, Daniël Vanmaekelbergh
Self-assembled nanocrystal solids show promise as a versatile platform for novel opto-electronic materials. Superlattices composed of a single layer of lead-chalcogenide and cadmium-chalcogenide nanocrystals with epitaxial connections between the nanocrystals, present outstanding questions to the community regarding their predicted band structure and electronic transport properties. However, the as-prepared materials are intrinsic semiconductors; to occupy the bands in a controlled way, chemical doping or external gating is required...
August 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28805395/a-strategy-for-the-co-assembly-of-co-axial-nanotube-polymer-hybrids
#8
Mingyang Ji, Mahesh B Dawadi, Alexandria R LaSalla, Yuan Sun, David A Modarelli, Jon Robert Parquette
Nanostructured materials having multiple, discrete domains of sorted components are particularly important to create efficient optoelectronics. The construction of multicomponent nanostructures from self-assembled components is exceptionally challenging due to the propensity of noncovalent materials to undergo structural reorganization in the presence of excipient polymers. This work demonstrates that polymer-nanotube composites comprised of a self-assembled nanotube wrapped with two conjugated polymers could be assembled using a layer-by-layer approach...
August 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28805367/tailoring-membrane-surface-properties-and-ultrafiltration-performances-via-self-assembly-of-polyethylene-glycol-block-polysulfone-block-polyethylene-glycol-block-copolymer-upon-thermal-and-solvent-annealing
#9
Ning Wang, Tao Wang, Yunxia Hu
Recently, ultrafiltration (UF) membranes faced great challenges including the fine control of the membrane surfaces for high filtration performances and antifouling properties in treating complex solution systems. Here, a particular type of amphiphilic block copolymers polyethylene glycol-block-polysulfone-block-polyethylene glycol (PEG-b-PSf-b-PEG) was synthesized through one-pot step-growth polymerization with mPEG as two ends to achieve the mobility of hydrophilic polymer chains. Without any other polymers or additives involved, the PEG-b-PSf-b-PEG triblock copolymer UF membrane was fabricated through the non-solvent induced phase separation (NIPS) method...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805277/two-dimensional-physical-gels-can-exist-even-at-zero-surface-pressure-at-the-air-water-interface-rheology-of-self-assembled-domains-of-small-molecules
#10
Mariam Veschgini, Taichi Habe, Salomé Mielke, Shigeto Inoue, Xianhe Liu, Marie Pierre Krafft, Motomu Tanaka
Films of mesoscopic domains self-assembled from fluorocarbon/hydrocarbon diblocks (FnHm) at the air/water interface were found to display highly elastic behavior. We determined the interfacial viscoelasticity of domain-patterned FnHm Langmuir monolayers by applying periodic shear stresses. Remarkably, we found the formation of two-dimensional gels even at zero surface pressure. These monolayers are predominantly elastic, which is unprecedented for surfactants, exhibiting gelation only at high surface pressures...
August 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28805224/molecular-dynamics-based-strength-estimates-of-beta-solenoid-proteins
#11
Amanda Parker, Krishnakumar Ravikumar, Daniel Cox
The use of beta solenoid proteins as functionalizable, nanoscale, self-assembling molecular building blocks may have many applications, including templating the growth of wires or higher-dimensional structures. By understanding their mechanical strengths, we can efficiently design the proteins for specific functions. We present a study of the mechanical properties of seven beta solenoid proteins using GROMACS molecular dynamics software to produce force/torque-displacement data, implement umbrella sampling of bending/twisting trajectories, produce Potentials of Mean Force (PMFs), extract effective spring constants, and calculate rigidities for two bending and two twisting directions for each protein...
August 14, 2017: Soft Matter
https://www.readbyqxmd.com/read/28805061/a-triple-helix-molecular-switch-electrochemical-ratiometric-biosensor-for-ultrasensitive-detection-of-nucleic-acids
#12
Erhu Xiong, Zhenzhen Li, Xiaohua Zhang, Jiawan Zhou, Xiaoxia Yan, Yunqing Liu, Jinhua Chen
Biomolecular receptors such as nucleic acids that switch between two or more conformations upon binding to a specific target can be used to build specific and sensitive biosensors. In this work, based on the electrochemical dual-signaling ratiometric strategy and triple-helix molecular switch, we developed a selective, reusable, and simple electrochemical DNA (E-DNA) biosensor for target DNA (T-DNA) detection. A hairpin DNA capture probe labeled with methylene blue (MB-DNA) self-assembles on the surface of gold electrode (GE) through Au-S bond, and then a single-strand DNA modified with two ferrocenes (Fc-DNA) on each end to enhance the oxidation signal hybridizes with the MB-DNA to form a triple-helix conformation...
August 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28804973/a-useful-method-for-preparing-mixed-brush-polymer-grafted-nanoparticles-by-polymerizing-block-copolymers-from-surfaces-with-reversed-monomer-addition-sequence
#13
Yang Zheng, Yucheng Huang, Brian C Benicewicz
The preparation of well-defined block copolymers using controlled radical polymerization depends on the proper order of monomer addition. The reversed order of monomer addition results in a mixture of block copolymer and homopolymer and thus has typically been avoided. In this paper, the low blocking efficiency of reversed monomer addition order is utilized in combination with surface initiated reversible addition-fragmentation chain-transfer polymerization to establish a facile procedure toward mixed polymer brush grafted nanoparticles SiO2 -g-(PS (polystyrene), PS-b-PMAA (polymethacrylic acid))...
August 14, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28804800/interfacial-rheological-properties-of-self-assembling-biopolymer-microcapsules
#14
Kaili Xie, Clément de Loubens, Frédéric Dubreuil, Deniz Z Gunes, Marc Jaeger, Marc Léonetti
Tuning the mechanical properties of microcapsules through a cost-efficient route of fabrication is still a challenge. The traditional method of layer-by-layer assembly of microcapsules allows building a tailored composite multi-layer membrane but is technically complex as it requires numerous steps. The objective of this article is to characterize the interfacial rheological properties of self-assembling biopolymer microcapsules that were obtained in one single facile step. This thorough study provides new insights into the mechanics of these weakly cohesive membranes...
August 14, 2017: Soft Matter
https://www.readbyqxmd.com/read/28803972/self-aggregation-behavior-of-hydrophobic-sodium-alginate-derivatives-in-aqueous-solution-and-their-application-in-the-nanoencapsulation-of-acetamiprid
#15
Xinyu Zhao, Jiacheng Li, Yuhong Feng, Gaobo Yu, Qingfeng Zhou, Furui He, Dunchao Xiao, Kai Chen, Lei Zhang
In this study, cholesteryl-grafted sodium alginate derivatives (CSAD) with different molecular weights were synthesized by esterification. The structure of CSAD was confirmed by FT-IR and (1)H NMR spectrometers. The effects of pH and CSAD polymer concentration on the self-assembled behavior and particle size of CSAD were investigated by fluorescence measurement (FM) and dynamic light scattering (DLS). In the presence of Ca(2+), the cholesteryl-grafted sodium alginate derivative was used for fabricating self-assembled nanoparticles that can effectively encapsulate the drug acetamiprid...
August 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28803479/design-of-cyclic-peptides-based-glucose-receptors-and-their-application-in-glucose-sensing
#16
Chao Li, Xin Chen, Fuyuan Zhang, Xingxing He, Guozhen Fang, Jifeng Liu, Shuo Wang
Glucose assay is of great scientific significance in clinical diagnostics and bioprocess monitoring and to design new glucose receptor is necessary for development of more sensitive, selective and robust glucose detection techniques. Herein, a series of cyclic peptides (CPs) glucose receptor were designed to mimic the binding sites of glucose binding protein (GBP) and CPs' sequence contained amino acid sites Asp, Asn, His, Asp, Arg, which constituted the first layer interactions of GBP. The properties of these CPs used as a glucose receptor or substitute for the GBP were studied by using quartz crystal microbalance (QCM) technique...
August 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28803478/biomimetic-bone-like-hydroxyapatite-by-mineralization-on-supramolecular-porous-fiber-networks
#17
Bo Li, Lei Kan, Xinyue Zhang, Jie Li, Ruiting Li, Qinyuan Gui, Dengli Qiu, Fei He, Ning Ma, Yapei Wang, Hao Wei
The hydroxyapatite (HA), main inorganic component of bone tissue, is mineralized with collagen fibril scaffolds during bone formation. Inspired by the process, self-assembled porous networks architecture was designed and synthesized by using the 2-ureido-4[1H]-pyrimidone (UPy) modified glycerol molecule UPy-Gly, which was further utilized as a template for biomimetic mineralization. When incubated in simulated body fluid (SBF), the HA nucleus firstly formed in the holes of the template by the induction of hydroxyls on the surface, grew along the nanofibers and fused with the template to fabricate the hydroxyapatite composites (UPy-Gly/HA)...
August 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28802999/primordial-membranes-more-than-simple-container-boundaries
#18
REVIEW
Martin M Hanczyc, Pierre-Alain Monnard
Cellular membranes, which are self-assembled bilayer structures mainly composed of lipids, proteins and conjugated polysaccharides, are the defining feature of cell physiology. It is likely that the complexity of contemporary cells was preceded by simpler chemical systems or protocells during the various evolutionary stages that led from inanimate to living matter. It is also likely that primitive membranes played a similar role in protocell 'physiology'. The composition of such ancestral membranes has been proposed as mixtures of single hydrocarbon chain amphiphiles, which are simpler versions of modern lipids...
August 10, 2017: Current Opinion in Chemical Biology
https://www.readbyqxmd.com/read/28802176/a-rapid-and-simple-protocol-to-prepare-a-living-biocomposite-that-mimics-electroactive-biofilms
#19
Stéphane Pinck, Mathieu Etienne, Manuel Dossot, Frédéric P A Jorand
A living material was formed by self-assembly of bacterial cells (Shewanella oneidensis MR-1 or Pseudomonas fluorescens) with carbon nanotubes in the presence of cytochrome c from a bovine heart with the goal to mimic electroactive biofilms. The role of cytochrome c on self-assembly, cell viability and extracellular electron transfer was studied. Scanning electron microscopy and dynamic light scattering experiments highlighted its role on the self-assembly of bacteria‑carbon nanotube aggregates within only 2h in solution...
August 1, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28800686/functionality-of-surfactants-in-waste-activated-sludge-treatment-a-review
#20
REVIEW
Renpeng Guan, Xingzhong Yuan, Zhibin Wu, Hou Wang, Longbo Jiang, Yifu Li, Guangming Zeng
Proper treatment of waste-activated sludge (WAS) involves three pivotal processes, dewatering, anaerobic digestion, and pollutants removal, which need to be re-assessed urgently. Although many traditional sludge treatments have been developed, it is prudent to enhance the efficiency of sludge treatment using multifunctional, flexible, and environmentally friendly surfactants. With regard to sludge dewatering, surfactants can weaken the binding interaction between sludge flocs and promote the dissolution of extracellular polymeric substances (EPSs), resulting in the release of bound water...
August 7, 2017: Science of the Total Environment
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