6,325 results match your criteria time tunable

Novel photosensitive dual-anisotropic conductive Janus film endued with magnetic-luminescent properties and derivative 3D structures.

J Colloid Interface Sci 2021 May 26;601:899-914. Epub 2021 May 26.

Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China.

A new photosensitive dual-anisotropic conductive Janus film (PDCJF) is proposed for the first time. It is rationally designed and manufactured by facile electrospinning. PDCJF is firstly constructed using 2,7-dibromo-9-fluorenone (DBF) with photoconductive and luminescent properties. Read More

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Combining tunable proteolytic sequences and a VEGF-mimetic peptide for the spatiotemporal control of angiogenesis within Elastin-Like Recombinamer scaffolds.

Acta Biomater 2021 Jun 9. Epub 2021 Jun 9.

G.I.R. BIOFORGE (Group for Advanced Materials and Nanobiotechnology), CIBER-BBN, Edificio LUCIA, Universidad de Valladolid, Paseo Belén 19, 47011 Valladolid, Spain. Electronic address:

One of the main challenges in regenerative medicine is the spatiotemporal control of angiogenesis, which is key for the successful repair of many tissues, and determines the proper integration of the implant through the generation of a functional vascular network. To this end, we have designed a three-dimensional (3D) model consisting of a coaxial binary elastin-like recombinamer (ELR) tubular construct. It displays fast and slow proteolytic hydrogels on its inner and outer part, respectively, both sensitive to the urokinase plasminogen activator protease. Read More

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Dynamic control of Purcell enhanced emission of erbium ions in nanoparticles.

Nat Commun 2021 Jun 11;12(1):3570. Epub 2021 Jun 11.

ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Barcelona, Spain.

The interaction of single quantum emitters with an optical cavity enables the realization of efficient spin-photon interfaces, an essential resource for quantum networks. The dynamical control of the spontaneous emission rate of quantum emitters in cavities has important implications in quantum technologies, e.g. Read More

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Insight into the Properties of Heteroleptic Metal Dithiolenes: Multistimuli Responsive Luminescence, Chromism, and Nonlinear Optics.

Inorg Chem 2021 Jun 11. Epub 2021 Jun 11.

Department of Chemical and Soil Sciences, INSTM Research Unit, University of Cagliari, 09042 Monserrato, Cagliari, Italy.

A comprehensive investigation of the functional properties of heteroleptic donor-M-acceptor dithiolene complexes BuN[M(L1)(L2)] is presented (M = Pd, Pt). The acceptor L1 consists of the chiral ()-(+)α-methylbenzyldithiooxamidate (()-α-MBAdto), the donor L2 is 2-thioxo-1,3-dithiole-4,5-dithiolato (dmit) in (Pd) and (Pt), 1,2-dicarbomethoxyethylenedithiolate (ddmet) in (Pd) and (Pt), or [4',5':5,6][1,4]dithiino[2,3-]quinoxaline-1',3'-dithiolato (quinoxdt) in (Pd) and (Pt). L1 is capable of undergoing proton exchange and promoting crystal formation in noncentrosymmetric space groups. Read More

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Monolayered H-Si-P semiconductors: structural stability, electronic structure, optical properties, and prospects for photocatalytic water splitting.

Phys Chem Chem Phys 2021 Jun 11. Epub 2021 Jun 11.

College of Physical Science and Technology, Sichuan University, Chengdu, 610065, China.

Group IV and V monolayers are promising state-of-the-art two-dimensional (2D) materials owing to their high carrier mobility, tunable bandgaps, and optical linear dichroism along with outstanding electronic and thermoelectric properties. Furthermore, recent studies revealed the stability of free-standing 2D monolayers by hydrogenation. Inspired by this, we systematically predicted and investigated the structure and properties of various hydrogen-saturated silicon phosphide (H-Si-P) monolayers based on first-principles calculations. Read More

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A universal managing circuit with stabilized voltage for maintaining safe operation of self-powered electronics system.

iScience 2021 May 4;24(5):102502. Epub 2021 May 4.

CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China.

Harvesting mechanical energy via a triboelectric nanogenerator (TENG) is a promising strategy for solving energy problems. However, it is necessary to develop an effective and safe energy managing circuit for preventing high voltage breaking electronic devices. Here, a universal managing circuit is developed to optimize TENG's output performance, which for the first time allows the TENG to safely power various sensor systems with a safe and stable voltage. Read More

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Wide-range lifetime-tunable and responsive ultralong organic phosphorescent multi-host/guest system.

Nat Commun 2021 Jun 10;12(1):3522. Epub 2021 Jun 10.

Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) & Xi'an Institute of Biomedical Materials and Engineering (IBME), Northwestern Polytechnical University, Xi'an, China.

The rational lifetime-tuning strategy of ultralong organic phosphorescence is extraordinarily important but seldom reported. Herein, a series of multi-host/guest ultralong organic phosphorescence materials with dynamic lifetime-tuning properties were reported. By doping a non-room-temperature phosphorescence emitter into various solid host matrices with continuously reduced triplet energy levels, a wide-range lifetime (from 3. Read More

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Formation of three-dimensional bicontinuous structures via molten salt dealloying studied in real-time by in situ synchrotron X-ray nano-tomography.

Nat Commun 2021 Jun 9;12(1):3441. Epub 2021 Jun 9.

Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY, USA.

Three-dimensional bicontinuous porous materials formed by dealloying contribute significantly to various applications including catalysis, sensor development and energy storage. This work studies a method of molten salt dealloying via real-time in situ synchrotron three-dimensional X-ray nano-tomography. Quantification of morphological parameters determined that long-range diffusion is the rate-determining step for the dealloying process. Read More

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FeVO4 Nanopolyhedron Photoelectrodes for Stable and Efficient Water Splitting.

ChemSusChem 2021 Jun 9. Epub 2021 Jun 9.

University of South China, School of Resources & Environment and Safety Engineering, NO. 28 Changsheng Road, Zhengxiang District, 421001, Hengyang, CHINA.

Novel crystalline FeVO 4 nanopolyhedron (FVO NPH) photoelectrodes are successfully prepared by using an in-situ solid-state transformation from hydrothermal FeOOH films via adding vanadium precursor and following thermal treatments. The FVO NPH photoelectrodes possess uniformly dispersed polyhedral nanocrystals that directly grow on the conductive substrate with tunable film thicknesses. The unique morphology enables them showing outstanding photoelectrocatalytic performance, and the optimized FVO NPH photoelectrode, which is annealed at 550 °C for 4 h with a film thickness of ~560 nm, exhibits excellent photocurrent densities of ~0. Read More

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A Smart Patch with On-Demand Detachable Adhesion for Bioelectronics.

Small 2021 Jun 8:e2101220. Epub 2021 Jun 8.

State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, P. R. China.

A smart ionic skin patch with on-demand detachable adhesion has been developed as human-machine interface for physiological signal monitoring. In spite of the multifunctions demonstrated by existing ionic skin, it is still difficult to distinguish different signals simultaneously. Moreover, the secondary damages to the tissues are often overlooked when the adhesive materials are removing from the wound. Read More

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Synthetic extracellular matrices with tailored adhesiveness and degradability support lumen formation during angiogenic sprouting.

Nat Commun 2021 06 7;12(1):3402. Epub 2021 Jun 7.

Bioactive Materials Laboratory, Max Planck Institute for Molecular Biomedicine, Münster, Germany.

A major deficit in tissue engineering strategies is the lack of materials that promote angiogenesis, wherein endothelial cells from the host vasculature invade the implanted matrix to form new blood vessels. To determine the material properties that regulate angiogenesis, we have developed a microfluidic in vitro model in which chemokine-guided endothelial cell sprouting into a tunable hydrogel is followed by the formation of perfusable lumens. We show that long, perfusable tubes only develop if hydrogel adhesiveness and degradability are fine-tuned to support the initial collective invasion of endothelial cells and, at the same time, allow for matrix remodeling to permit the opening of lumens. Read More

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Thiol-Methylsulfone-Based Hydrogels for Cell Encapsulation: Reactivity Optimization of Aryl-Methylsulfone Substrate for Fine-Tunable Gelation Rate and Improved Stability.

Biomacromolecules 2021 Jun 6. Epub 2021 Jun 6.

INM - Leibniz Institute for New Materials, Campus D2-2, 66123, Saarbrücken, Germany.

Hydrogels are widely used as hydrated matrices for cell encapsulation in a number of applications, spanning from advanced 3D cultures and tissue models to cell-based therapeutics and tissue engineering. Hydrogel formation in the presence of living cells requires cross-linking reactions that proceed efficiently under close to physiological conditions. Recently, the nucleophilic aromatic substitution of phenyl-oxadiazole (Ox) methylsulfones (MS) by thiols was introduced as a new cross-linking reaction for cell encapsulation. Read More

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Ligand Control of Co Nuclear Spin Relaxation Thermometry.

Magnetochemistry 2020 Dec 12;6(4). Epub 2020 Nov 12.

Department of Chemistry, Colorado State University, 1301 Center Ave., Fort Collins, CO 80523-1872, USA.

Studying the correlation between temperature-driven molecular structure and nuclear spin dynamics is essential to understanding fundamental design principles for thermometric nuclear magnetic resonance spin-based probes. Herein, we study the impact of progressively encapsulating ligands on temperature-dependent Co (spin-lattice) and (spin-spin) relaxation times in a set of Co(III) complexes: K[Co(CN)] (); [Co(NH)]Cl (); [Co(en)]Cl (), en = ethylenediamine); [Co(tn)]Cl (), tn = trimethylenediamine); [Co(tame)]Cl (), tame = triaminomethylethane); and [Co(dinosar)]Cl (), dinosar = dinitrosarcophagine). Measurements indicate that Co and increase with temperature for - between 10 and 60 °C, with the greatest Δ/Δ and Δ/Δ temperature sensitivities found for and , 5. Read More

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December 2020

Synergistic integration of metal nanoclusters and biomolecules as hybrid systems for therapeutic applications.

Acta Pharm Sin B 2021 May 15;11(5):1175-1199. Epub 2020 Dec 15.

Guangdong Key Laboratory of Biomedical Measurements and Ultrasound Imaging, Department of Biomedical Engineering, Shenzhen University, Shenzhen 518060, China.

Therapeutic nanoparticles are designed to enhance efficacy, real-time monitoring, targeting accuracy, biocompatibility, biodegradability, safety, and the synergy of diagnosis and treatment of diseases by leveraging the unique physicochemical and biological properties of well-developed bio-nanomaterials. Recently, bio-inspired metal nanoclusters (NCs) consisting of several to roughly dozens of atoms (<2 nm) have attracted increasing research interest, owing to their ultrafine size, tunable fluorescent capability, good biocompatibility, variable metallic composition, and extensive surface bio-functionalization. Hybrid core-shell nanostructures that effectively incorporate unique fluorescent inorganic moieties with various biomolecules, such as proteins (enzymes, antigens, and antibodies), DNA, and specific cells, create fluorescently visualized molecular nanoparticle. Read More

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Amination of the [email protected] endohedral fullerene: tunable substitution effect on quantum coherence behaviors.

Chem Sci 2020 May 28;11(39):10737-10743. Epub 2020 May 28.

Beijing National Laboratory of Molecular Science, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University Beijing 100871 China

The core-shell structure of endohedral fullerene-based anisotropic magnetic molecules of high spin with long coherence time could help scale up quantum systems. In this research, by amination of [email protected] with morpholine, three derivatives are functionalized with 5, 7 and 9 morpholine groups providing an interesting model to investigate the relationship between the quantum coherence and the spin environment. The original radical located on the carbon cage is successfully quenched, affording a quantum phase memory times () over 5 μs at 5 K. Read More

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Rapid formation and real-time observation of micron-sized conjugated nanofibers with tunable lengths and widths in 20 minutes by living crystallization-driven self-assembly.

Chem Sci 2020 Jul 29;11(32):8416-8424. Epub 2020 Jul 29.

Department of Chemistry, Seoul National University Seoul 08826 Korea

Preparing well-defined semiconducting nanostructures from conjugated polymers is of paramount interest for organic optoelectronic devices. Several studies have demonstrated excellent structural and size control from block copolymers () containing non-conjugated blocks crystallization-driven self-assembly (CDSA); however, the precise control of their size and shape remains a challenge due to their poor solubility, causing rapid and uncontrolled aggregation. This study presents a new type of fully conjugated BCP comprising two polyacetylene derivatives termed poly(cyclopentenylene-vinylene) to prepare semiconducting 1D nanofibers. Read More

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Assembly Control at a Low Péclet Number in Ultracentrifugation for Uniformly Sized Nanoparticles.

J Phys Chem C Nanomater Interfaces 2021 Apr 15;125(16):8752-8758. Epub 2021 Apr 15.

Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, PO Box 513, 5600MB Eindhoven, the Netherlands.

The intrinsic high diffusion rate of colloids at low Péclet number results in an extremely fast crystallization process and instant formation of colloidal crystals, even at an ultracentrifugal field of extremely high intensity. By introducing a small number of clusters in sedimention, it should be possible to slow down the crystallization process, thus making the assembly order tunable in preparative ultracentrifugation experiments. Here, we used sodium dodecyl sulfate-stabilized polystyrene nanoparticles (with a size dispersity of 1. Read More

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Demystifying autofluorescence with excitation-scanning hyperspectral imaging.

Proc SPIE Int Soc Opt Eng 2018 Jan-Feb;10497. Epub 2018 Feb 20.

Department of Chemical and Biomolecular Engineering, University of South Alabama.

Autofluorescence has historically been considered a nuisance in medical imaging. Many endogenous fluorophores, specifically, collagen, elastin, NADH, and FAD, are found throughout the human body. Diagnostically, these signals can be prohibitive since they can outcompete signals introduced for diagnostic purposes. Read More

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February 2018

PDLLA-Zn-nitrided Fe bioresorbable scaffold with 53-μm-thick metallic struts and tunable multistage biodegradation function.

Sci Adv 2021 Jun 4;7(23). Epub 2021 Jun 4.

Department of Cardiology, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China.

Balancing the biodegradability and mechanical integrity of a bioresorbable scaffold (BRS) with time after implantation to match the remodeling of the scaffolded blood vessel is important, but a key challenge in doing so remains. This study presents a novel intercalated structure of a metallic BRS by introducing a nanoscale Zn sacrificial layer between the nitrided Fe platform and the sirolimus-carrying poly(d,l-lactide) drug coating. The PDLLA-Zn-FeN BRS shows a multistage biodegradation behavior, maintaining mechanical integrity at the initial stage and exhibiting accelerated biodegradation at the subsequent stage in both rabbit abdominal aortas and human coronary arteries, where complete biodegradation was observed about 2 years after implantation. Read More

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An ex vivo physiologic and hyperplastic vessel culture model to study intra-arterial stent therapies.

Biomaterials 2021 May 29;275:120911. Epub 2021 May 29.

Department of Anesthesiology, School of Medicine, Yale University, New Haven, CT, 06519, USA; Department of Biomedical Engineering, School of Medicine, Yale University, New Haven, CT, 06519, USA. Electronic address:

Conventional in vitro methods for biological evaluation of intra-arterial devices such as stents fail to accurately predict cytotoxicity and remodeling events. An ex vivo flow-tunable vascular bioreactor system (VesselBRx), comprising intra- and extra-luminal monitoring capabilities, addresses these limitations. VesselBRx mimics the in vivo physiological, hyperplastic, and cytocompatibility events of absorbable magnesium (Mg)-based stents in ex vivo stent-treated porcine and human coronary arteries, with in-situ and real-time monitoring of local stent degradation effects. Read More

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Improved drug delivery and accelerated diabetic wound healing by chondroitin sulfate grafted alginate-based thermoreversible hydrogels.

Mater Sci Eng C Mater Biol Appl 2021 Jul 14;126:112169. Epub 2021 May 14.

Department of Pharmacy, COMSATS University, Islamabad, Abbottabad Campus, 22010, Pakistan.

Injectable hydrogels with multifunctional tunable properties comprising biocompatibility, anti-oxidative, anti-bacterial, and/or anti-infection are highly preferred to efficiently promote diabetic wound repair and its development remains a challenge. In this study, we report chondroitin sulphate (CS) and sodium alginate (SA)-based injectable hydrogel using solvent casting method loaded with curcumin that could potentiate reepithelization, increase angiogenesis, and collagen deposition at wound microenvironment to endorse healing cascade. The physical interaction and self-assembly of chondroitin sulfate grafted alginate (CS-Alg-g-PF127) hydrogel were confirmed using nuclear magnetic resonance (H NMR) and Fourier transformed infrared spectroscopy (FT-IR), and cytocompatibility was confirmed by fibroblast viability assay. Read More

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[Cu{SC(O)OPr}]: A Giant Self-Assembled Copper(I) Supramolecular Wheel Exhibiting Photoluminescence Tuning and Correlations with Dynamic Solvation and Solventless Synthesis.

Inorg Chem 2021 Jun 3. Epub 2021 Jun 3.

Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan R.O.C.

The hierarchical self-organization of structurally complex high-nuclearity metal clusters with metallosupramolecular wheel architectures that are obtained from the self-assembly of smaller solvated cluster units is rare and unique. Here, we use the potentially heteroditopic monothiocarbonate ligand and demonstrate for the first time the synthesis and structure of a solvated non-cyclic hexadecanuclear cluster [Cu{SC(O)OPr}]·2THF () that can simultaneously desolvate and self-assemble in solution and subsequently form a giant metallaring, [Cu{SC(O)OPr}] (). We also demonstrate a luminescent precursor to cluster () can be achieved through a solventless and rapid mechanochemical synthesis. Read More

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Dissociation of Biomolecules by an Intense Low-Energy Electron Beam in a High Sensitivity Time-of-Flight Mass Spectrometer.

J Am Soc Mass Spectrom 2021 Jun 3. Epub 2021 Jun 3.

Sciex, 71 Four Valley Drive Concord, Ontario L4K 4V8, Canada.

We report the progress on an electron-activated dissociation (EAD) device coupled to a quadrupole TOF mass spectrometer (QqTOF MS) developed in our group. This device features a new electron beam optics design allowing up to 100 times stronger electron currents in the reaction cell. The electron beam current reached the space-charge limit of 0. Read More

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Branched Aggregates with Tunable Morphology via Hierarchical Self-Assembly of Azobenzene-Derived Molecular Double-Brushes.

Angew Chem Int Ed Engl 2021 Jun 1. Epub 2021 Jun 1.

East China University of Science and Technology, School of Materials Science and Engineering, Meilong Road 130, 200237, Shanghai, CHINA.

Hierarchical self-assembly has been one of the most effective approach to fabricate nature-inspired materials with subtle nanostructures and variable functions. Herein, we report a distinct hierarchical self-assembly process of azobenzene-derived Janus molecular double-brushes (MDBs) with each graft site carrying a poly(azobenzene-acrylate) (PAzo) chain and a poly(ethylene oxide) (PEO) chain. Asymmetric tapered-worm (ATW) nanostructures with chain-end reactivity assembling from the azobenzene-derived MDBs serve as primary subunits to prepare branched supermicelles by increasing water content (Cw) in THF/water, which is predominantly facilitated by the distinctive molecular brush architecture and the intermolecular interaction of PAzo brushes. Read More

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N-Heterocyclic Carbene-Stabilized Gold Nanoclusters in a Metal-Organic Framework for Photocatalytic CO2 Reduction.

Angew Chem Int Ed Engl 2021 Jun 1. Epub 2021 Jun 1.

Tongji University, Department of Chemistry, 1239 Siping Rd., 200092, Shanghai, CHINA.

Ultrafine gold nanoclusters (Au-NCs) are susceptible to migrate and aggregate, even in porosity of many crystalline solids.  N-heterocyclic carbenes (NHCs) are a class of structurally diverse ligands for stabilization of Au-NCs in homogeneous chemistry, showing catalytic reactivity in CO 2 activation. Herein, for the first time, we demonstrate a heterogeneous nucleation approach to stabilize ultrasmall and highly dispersed gold nanoclusters in a metal-free NHC-functionalized porous matrix. Read More

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Carrier Blocking Layer Materials and Application in Organic Photodetectors.

Nanomaterials (Basel) 2021 May 26;11(6). Epub 2021 May 26.

Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, 149 Yanchang Road, Shanghai 200072, China.

As a promising candidate for next-generation photodetectors, organic photodetectors (OPDs) have gained increasing interest as they offer cost-effective fabrication methods using solution processes and a tunable spectral response range, making them particularly attractive for large area image sensors on lightweight flexible substrates. Carrier blocking layers engineering is very important to the high performance of OPDs that can select a certain charge carriers (holes or electrons) to be collected and suppress another carrier. Carrier blocking layers of OPDs play a critical role in reducing dark current, boosting their efficiency and long-time stability. Read More

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Tunable and Passively Mode-Locking Nd:GdLaNbO Picosecond Laser.

Molecules 2021 May 26;26(11). Epub 2021 May 26.

The Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.

A high-quality Nd:GdLaNbO (Nd:GLNO) crystal is grown by the Czochralski method, demonstrating wide absorption and fluorescence spectra and advantage for producing ultrafast laser pulses. In this paper, the tunable and passively mode-locking Nd:GLNO lasers are characterized for the first time. The tuning coverage is 34. Read More

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Dynamics and Structure Formation of Confined Polymer Thin Films Supported on Solid Substrates.

Polymers (Basel) 2021 May 17;13(10). Epub 2021 May 17.

State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

The stability/instability behavior of polystyrene (PS) films with tunable thickness ranging from higher as-cast to lower residual made on Si substrates with and without native oxide layer was studied in this paper. For further extraction of residual PS thin film (h) and to investigate the polymer-substrate interaction, Guiselin's method was used by decomposing the polymer thin films in different solvents. The solvents for removing loosely adsorbed chains and extracting the strongly adsorbed irreversible chains were selected based on their relative desorption energy difference with polymer. Read More

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Preparation of [email protected] under Water System for Chemical Warfare Agents Degradation.

Materials (Basel) 2021 May 6;14(9). Epub 2021 May 6.

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.

There is an urgent need to develop catalytic degradation technologies for chemical warfare agents (CWAs) that are environmentally friendly and do not require secondary treatment. UiO-66-NH and other metal-organic frameworks (MOFs) based on zirconium have been shown to promote the catalytic degradation of CWAs. At the same time, MOFs have been studied, and they have shown interesting properties in CWA removal because of their ultrahigh surface area, tunable structures, and periodically distributed abundant catalytic sites. Read More

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Ultra-Highly Sensitive Hydrogen Chloride Detection Based on Quartz-Enhanced Photothermal Spectroscopy.

Sensors (Basel) 2021 May 20;21(10). Epub 2021 May 20.

National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China.

Combining the merits of non-contact measurement and high sensitivity, the quartz-enhanced photothermal spectroscopy (QEPTS) technique is suitable for measuring acid gases such as hydrogen chloride (HCl). In this invited paper, we report, for the first time, on an ultra-highly sensitive HCl sensor based on the QEPTS technique. A continuous wave, distributed feedback (CW-DFB) fiber-coupled diode laser with emission wavelength of 1. Read More

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