keyword
MENU ▼
Read by QxMD icon Read
search

self-assembly

keyword
https://www.readbyqxmd.com/read/28231012/quantum-percolation-and-magnetic-nano-droplet-states-in-electronically-phase-separated-manganite-nanowires
#1
Kaixuan Zhang, Lin Li, Hui Li, Qiyuan Feng, Nan Zhang, Long Cheng, Xiaodong Fan, Yubin Hou, Qingyou Lu, Zhenyu Zhang, Changgan Zeng
One-dimensional (1D) confinement has been revealed to effectively tune the properties of materials in homogeneous states. The 1D physics can be further enriched by electronic inhomogeneity, which unfortunately remains largely unknown. Here we demonstrate the ultra-high sensitivity to magnetic fluctuations and the tunability of phase stability in the electronic transport properties of self-assembled electronically phase-separated manganite nanowires with extreme aspect ratio. The onset of magnetic nano-droplet state, a precursor to the ferromagnetic metallic state, is unambiguously revealed, which is attributed to the small lateral size of the nanowires that is comparable to the droplet size...
February 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28230977/extracellular-self-assembly-of-functional-and-tunable-protein-conjugates-from-bacillus-subtilis
#2
Charlie Gilbert, Mark Howarth, Colin R Harwood, Tom Ellis
The ability to stably and specifically conjugate recombinant proteins to one another is a powerful approach for engineering multifunctional enzymes, protein therapeutics and novel biological materials. While many of these applications have been illustrated through in vitro and in vivo intracellular protein conjugation methods, extracellular self-assembly of protein conjugates offers unique advantages: simplifying purification, reducing toxicity and burden, and enabling tunability. Exploiting the recently described SpyTag-SpyCatcher system, we describe here how enzymes and structural proteins can be genetically-encoded to covalently conjugate in culture media following programmable secretion from Bacillus subtilis...
February 23, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28230870/colloidal-capsules-nano-and-microcapsules-with-colloidal-particle-shells
#3
REVIEW
Tobias Bollhorst, Kurosch Rezwan, Michael Maas
Utilizing colloidal particles for the assembly of the shell of nano- and microcapsules holds great promise for the tailor-made design of new functional materials. Increasing research efforts are devoted to the synthesis of such colloidal capsules, by which the integration of modular building blocks with distinct physical, chemical, or morphological characteristics in a capsule's shell can result in novel properties, not present in previous encapsulation structures. This review will provide a comprehensive overview of the synthesis strategies and the progress made so far of bringing nano- and microcapsules with shells of densely packed colloidal particles closer to application in fields such as chemical engineering, materials science, or pharmaceutical and life science...
February 23, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28230537/core-shell-znco2o4-tio2-nanowall-array-as-an-anode-for-li-ion-batteries
#4
Wei Shi, Haitao Zhao, Bingan Lu
In this paper, ZnCo2O4 nanowall arrays were firstly obtained through self-assembly followed by calcination. Then atomic layer deposition was used to fabricate core-shell ZnCo2O4@TiO2 nanowall arrays (NWAs) as anode materials for lithium ion batteries (LIBs). The hierarchical nanowall array nanostructure with fast ion diffusion and electron transport at electrode/electrolyte interface, while the shell of TiO2 with excellent chemical stability can protect the ZnCo2O4 nanowall arrays from volume expansion during charge and discharge processes...
February 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28230343/interfacial-mechanical-properties-of-graphene-on-self-assembled-monolayers-experiments-and-simulations
#5
Qing Tu, Ho Shin Kim, Thomas J Oweida, Zehra Parlak, Yaroslava G Yingling, Stefan Zauscher
Self-assembled monolayers (SAMs) have been widely used to engineer the electronic properties of substrate-supported graphene devices. However, little is known about how the surface chemistry of SAMs affects the interfacial mechanical properties of graphene supported on SAMs. Fluctuations and changes in these properties affect the stress transfer between substrate and the supported graphene and thus the performance of the graphene-based devices. The changes in interfacial mechanical properties can be characterized by measuring the out-of-plane elastic properties...
February 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28230164/dynamical-majorana-edge-modes-in-a-broad-class-of-topological-mechanical-systems
#6
Emil Prodan, Kyle Dobiszewski, Alokik Kanwal, John Palmieri, Camelia Prodan
Mechanical systems can display topological characteristics similar to that of topological insulators. Here we report a large class of topological mechanical systems related to the BDI symmetry class. These are self-assembled chains of rigid bodies with an inversion centre and no reflection planes. The particle-hole symmetry characteristic to the BDI symmetry class stems from the distinct behaviour of the translational and rotational degrees of freedom under inversion. This and other generic properties led us to the remarkable conclusion that, by adjusting the gyration radius of the bodies, one can always simultaneously open a gap in the phonon spectrum, lock-in all the characteristic symmetries and generate a non-trivial topological invariant...
February 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28230060/flower-like-superstructures-of-aie-active-tetraphenylethylene-through-solvophobic-controlled-self-assembly
#7
Mina Salimimarand, Duong Duc La, Mohammad Al Kobaisi, Sheshanath V Bhosale
The development of well-organized structures with high luminescent properties in the solid and aggregated states is of both scientific and technological interest due to their applications in nanotechnology. In this paper we described the synthesis of amphiphilic and dumbbell shaped AIE-active tetraphenylethylene (TPE) derivatives and studied their self-assembly with solvophobic control. Interestingly, both TPE derivatives form a 3D flower-shape supramolecular structure from THF/water solutions at varying water fractions...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28230054/magnetization-switching-in-ferromagnets-by-adsorbed-chiral-molecules-without-current-or-external-magnetic-field
#8
Oren Ben Dor, Shira Yochelis, Anna Radko, Kiran Vankayala, Eyal Capua, Amir Capua, See-Hun Yang, Lech Tomasz Baczewski, Stuart Stephen Papworth Parkin, Ron Naaman, Yossi Paltiel
Ferromagnets are commonly magnetized by either external magnetic fields or spin polarized currents. The manipulation of magnetization by spin-current occurs through the spin-transfer-torque effect, which is applied, for example, in modern magnetoresistive random access memory. However, the current density required for the spin-transfer torque is of the order of 1 × 10(6) A·cm(-2), or about 1 × 10(25) electrons s(-1) cm(-2). This relatively high current density significantly affects the devices' structure and performance...
February 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28230046/gel-phase-formation-in-dilute-triblock-copolyelectrolyte-complexes
#9
Samanvaya Srivastava, Marat Andreev, Adam E Levi, David J Goldfeld, Jun Mao, William T Heller, Vivek M Prabhu, Juan J de Pablo, Matthew V Tirrell
Assembly of oppositely charged triblock copolyelectrolytes into phase-separated gels at low polymer concentrations (<1% by mass) has been observed in scattering experiments and molecular dynamics simulations. Here we show that in contrast to uncharged, amphiphilic block copolymers that form discrete micelles at low concentrations and enter a phase of strongly interacting micelles in a gradual manner with increasing concentration, the formation of a dilute phase of individual micelles is prevented in polyelectrolyte complexation-driven assembly of triblock copolyelectrolytes...
February 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28229586/chlorhexidine-loaded-amorphous-calcium-phosphate-nanoparticles-for-inhibiting-degradation-and-inducing-mineralization-of-type-i-collagen
#10
Xue Cai, Bing Han, Yan Liu, Fucong Tian, Fuxin Liang, Xiaoyan Wang
A major shortcoming of contemporary dentin adhesives is their limited durability. Exposed collagen fibrils within the bonding interface are degraded by matrix metalloproteinases (MMPs), resulting in aging of the resin-dentin bond. In this study, chlorhexidine-loaded amorphous calcium phosphate (ACP) nanoparticles were synthesized to induce the mineralization of collagen fibrils. The nanoparticles sustainably released chlorhexidine, to inhibit MMPs during mineralization. Three types of ACP nanoparticles were prepared: N-ACP containing no chlorhexidine, C-ACP containing chlorhexidine acetate, and G-ACP containing chlorhexidine gluconate, which had a higher drug-loading than C-ACP...
February 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28229133/towards-enhanced-optical-sensor-performance-seira-and-sers-with-plasmonic-nanostars
#11
O Bibikova, J Haas, A I López-Lorente, A Popov, M Kinnunen, I Meglinski, B Mizaikoff
We report the preparation and characterization of plasmonic chip-based systems comprising self-assembled gold nanostars at silicon substrates that enable concomitantly enhanced Raman (surface enhanced Raman spectroscopy; SERS) and mid-infrared (surface enhanced infrared reflection or absorption spectroscopy; SEIRA) spectral signatures. The high-aspect-ratio structure of gold nanostars provides an increased number of hot spots at their surface, which results in an electric field enhancement around the nanomaterial...
February 23, 2017: Analyst
https://www.readbyqxmd.com/read/28228855/a-new-class-of-organogelators-based-on-triphenylmethyl-derivatives-of-primary-alcohols-hydrophobic-interactions-alone-can-mediate-gelation
#12
Wangkhem P Singh, Rajkumar S Singh
In the present work, we have explored the use of the triphenylmethyl group, a commonly used protecting group for primary alcohols as a gelling structural component in the design of molecular gelators. We synthesized a small library of triphenylmethyl derivatives of simple primary alcohols and studied their gelation properties in different solvents. Gelation efficiency for some of the derivatives was moderate to excellent with a minimum gelation concentration ranging between 0.5-4.0% w/v and a gel-sol transition temperature range of 31-75 °C...
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28228529/recapitulation-of-physiological-spatiotemporal-signals-promotes-in-vitro-formation-of-phenotypically-stable-human-articular-cartilage
#13
Johnathan J Ng, Yiyong Wei, Bin Zhou, Jonathan Bernhard, Samuel Robinson, Aonnicha Burapachaisri, X Edward Guo, Gordana Vunjak-Novakovic
Standard isotropic culture fails to recapitulate the spatiotemporal gradients present during native development. Cartilage grown from human mesenchymal stem cells (hMSCs) is poorly organized and unstable in vivo. We report that human cartilage with physiologic organization and in vivo stability can be grown in vitro from self-assembling hMSCs by implementing spatiotemporal regulation during induction. Self-assembling hMSCs formed cartilage discs in Transwell inserts following isotropic chondrogenic induction with transforming growth factor β to set up a dual-compartment culture...
February 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28225632/tetraalkoxyphenanthrene-fused-thiadiazoloquinoxalines-synthesis-electronic-optical-and-electrochemical-properties-and-self-assembly
#14
Shin-Ichiro Kato, Keitaro Watanabe, Misaki Tamura, Masahiko Ueno, Masashi Nitani, Yutaka Ie, Yoshio Aso, Takeshi Yamanobe, Hiroki Uehara, Yosuke Nakamura
π-Extended thiadiazoloquinoxaline (TQ) derivatives 1a,b‒3a,b, in which a tetraalkoxyphenanthrene moiety is annulated with the TQ core and benzene rings are incorporated via the ethynylene spacer, were synthesized. They display absorption bands reaching into 750 nm and possess the electron-affinity comparable to [60]fullerene. The CF3- and OMe-substituents on the benzene rings have moderate effects on modulation of the HOMO and LUMO levels. Tetraalkoxyphenanthrene-fused TQs 1a,b‒3a,b aggregate in the solid state and assemble in solution through π‒π stacking interactions...
February 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28225593/programmed-self-assembly-of-hierarchical-nanostructures-through-protein-nanoparticle-co-engineering
#15
Rubul Mout, Gulen Yesilbag Tonga, Li-Sheng Wang, Moumita Ray, Trinava Roy, Vincent M Rotello
Hierarchical organization of macromolecules through self-assembly is a prominent feature in biological systems. Synthetic fabrication of such structures provides materials with emergent functions. Here we report the fabrication of self-assembled superstructures through co-engineering of recombinant proteins and nanoparticles. These structures feature a highly-sophisticated level of multi-layered hierarchical organization of the components: individual proteins and nanoparticles co-assemble to form discrete assemblies that collapse to form granules, which then further self-organize to generate superstructures of hundreds of nanometer size...
February 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28225588/self-assembled-and-one-step-synthesis-of-interconnected-3d-network-of-fe3o4-reduced-graphene-oxide-nanosheets-hybrid-for-high-performance-supercapacitor-electrode
#16
Rajesh Kumar, Rajesh Kumar Singh, Alfredo R Vaz, Raluca Savu, Stanislav A Moshkalev
In the present work, we have synthesized three dimensional (3D) reduced graphene oxide nanosheets (rGO NSs) containing iron oxide nanoparticles (Fe3O4 NPs) hybrids (3D Fe3O4/rGO) by one-pot microwave approach. Structural and morphological studies reveal that the as-synthesized Fe3O4/rGO hybrids were composed of faceted Fe3O4 NPs induced into the interconnected network of rGO NSs. The morphologies and structures of the 3D hybrids have been characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectrometer (XPS)...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28225584/preferential-alignment-of-incommensurate-block-copolymer-dot-arrays-forming-moir%C3%A3-superstructures
#17
Cong Jin, Brian C Olsen, Erik J Luber, Jillian M Buriak
Block copolymer (BCP) self-assembly is of great interest as a cost-effective method for large-scale, high-resolution nanopattern fabrication. Directed self-assembly can induce long-range order and registration, reduce defect-density, and enable access to patterns of higher complexity. Here we demonstrate preferential orientation of two incommensurate BCP dot arrays. A bottom layer of hexagonal silica dots is prepared via typical self-assembly from a PS-b-PDMS block copolymer. Self-assembly of a second, or top, layer of a different a PS-b-PDMS block copolymer that forms a hexagonal dot pattern with different periodicity, results in a predictable Moiré superstructure...
February 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28225273/fabric-softener-cellulose-nanocrystal-interaction-a-model-for-assessing-surfactant-deposition-on-cotton
#18
Evdokia K Oikonomou, Fanny Mousseau, Nikolay Christov, Galder Cristobal, Annie Vacher, Marc Airiau, Claudie Bourgaux, Laurent Heux, Jean-François Berret
There is currently a renewed interest for improving household and personal care formulations to provide more environment friendly products. Fabric conditioners used as softeners have to fulfill a number of stability and biodegradability requirements. They should also display significant adsorption on cotton in the conditions of use. The quantification of surfactant adsorption remains however difficult because the fabric woven structure is complex and deposited amounts are generally small. Here we propose a method to evaluate cellulose/surfactant interactions with increased detection sensitivity...
February 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28225261/structural-color-for-additive-manufacturing-3d-printed-photonic-crystals-from-block-copolymers
#19
Bret M Boyle, Tracy A French, Ryan Michael Pearson, Blaine G McCarthy, Garret M Miyake
The incorporation of structural color into 3D printed parts is reported, presenting an alternative to the need for pigments or dyes for colored parts produced through additive manufacturing. Thermoplastic build materials composed of dendritic block copolymers were designed, synthesized, and used to additively manufacture plastic parts exhibiting structural color. The reflection properties of the photonic crystals arise from the periodic nanostructure formed through block copolymer self-assembly during polymer processing...
February 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28225137/correction-enhanced-resistive-switching-effect-upon-illumination-in-self-assembled-niwo4-nano-nests
#20
Bai Sun, Wenxi Zhao, Lujun Wei, Hongwei Li, Peng Chen
Correction for 'Enhanced resistive switching effect upon illumination in self-assembled NiWO4 nano-nests' by Bai Sun et al., Chem. Commun., 2014, 50, 13142-13145.
February 22, 2017: Chemical Communications: Chem Comm
keyword
keyword
31024
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"