5,231 results match your criteria realized light


Rapid, continuous projection multi-photon 3D printing enabled by spatiotemporal focusing of femtosecond pulses.

Light Sci Appl 2021 Sep 24;10(1):199. Epub 2021 Sep 24.

School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.

There is demand for scaling up 3D printing throughput, especially for the multi-photon 3D printing process that provides sub-micrometer structuring capabilities required in diverse fields. In this work, high-speed projection multi-photon printing is combined with spatiotemporal focusing for fabrication of 3D structures in a rapid, layer-by-layer, and continuous manner. Spatiotemporal focusing confines printing to thin layers, thereby achieving print thicknesses on the micron and sub-micron scale. Read More

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September 2021

Core-Shell Fluorescent Polymeric Particles with Tunable White Light Emission Based on Aggregation Microenvironment Manipulation.

Angew Chem Int Ed Engl 2021 Sep 24. Epub 2021 Sep 24.

The Chinese University of Hong Kong - Shenzhen, School of Science and Engineering, CHINA.

White-light emitting polymers (WLEPs) based on aggregation microenvironment-sensitive aggregation-induced emission (AIE) and Förster resonance energy transfer (FRET) have aroused great interest in lighting and optoelectronic devices. Herein, we developed a novel strategy to construct WLEP particles via a stepwise self-stabilized precipitation polymerization of two emission-complementary AIEgens under core-shell engineering, where the AIE characteristics and FRET process of core-shell fluorescent polymeric particles (CS-FPPs) could be modulated by altering aggregation microenvironment under swelling and shrinking of polymers, facilitating the tunable white light emission of CS-FPPs. Furthermore, such tuning could be fast realized in the solid state, thus demonstrating the potential in anti-counterfeiting. Read More

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September 2021

Multicolor and photothermal dual-mode assay of alkaline phosphatase based on the UV light-assisted etching of gold nanorods.

Anal Chim Acta 2021 Oct 9;1181:338926. Epub 2021 Aug 9.

School of Chemistry and Pharmaceutical Science, State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, Guangxi Normal University, Guilin, 541004, PR China.

A multicolor and photothermal dual-mode assay for sensitive alkaline phosphatase (ALP) determination was realized based on the 3,3',5,5'-tetramethylbenzidine (TMB)-induced etching of gold nanorods (AuNRs). TMB was oxidized under ultraviolet light irradiation to form TMB. In the presence of ALP, ascorbic acid phosphate (AAP) is converted to ascorbic acid, which can then reduce the levels of TMB, resulting in lower concentrations of TMB. Read More

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October 2021

Unconventional van der Waals heterostructures beyond stacking.

iScience 2021 Sep 28;24(9):103050. Epub 2021 Aug 28.

Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.

Two-dimensional crystals provide exceptional opportunities for integrating dissimilar materials and forming interfaces where distinct properties and phenomena emerge. To date, research has focused on two basic heterostructure types: vertical van der Waals stacks and laterally joined monolayer crystals with in-plane line interfaces. Much more diverse architectures and interface configurations can be realized in the few-layer and multilayer regime, and if mechanical stacking and single-layer growth are replaced by processes taking advantage of self-organization, conversions between polymorphs, phase separation, strain effects, and shaping into the third dimension. Read More

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September 2021

Real-time observation of nucleation and growth of Au on CdSe quantum dot templates.

Sci Rep 2021 Sep 21;11(1):18777. Epub 2021 Sep 21.

Guangdong Technion-Israel Institute of Technology, Shantou, 515063, Guangdong, China.

Semiconductor quantum dot (QD) arrays can be useful for optical devices such as lasers, solar cells and light-emitting diodes. As the size distribution influences the band-gap, it is worthwhile to investigate QDs prepared using different solvents because each of them could influence the overall morphology differently, depending on the ligand network around individual QDs. Here, we follow the nucleation and growth of gold (Au) on CdSe QD arrays to investigate the influence of surface ligands and thereby realized interparticle distance between QDs on Au growth behaviour. Read More

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September 2021

Elucidating Inner Workings of Naturally Sourced Organic Optoelectronic Materials with Ultrafast Spectroscopy.

Chemistry 2021 Sep 21. Epub 2021 Sep 21.

Oregon State University, Department of Chemistry, 153 Gilbert Hall, 97331, Corvallis, UNITED STATES.

Recent advances in sustainable optoelectronics including photovoltaics, light-emitting diodes, transistors, and semiconductors have been enabled by π-conjugated organic molecules. A fundamental understanding of light-matter interactions involving these materials can be realized by time-resolved electronic and vibrational spectroscopies. In this Minireview, the photoinduced mechanisms including charge/energy transfer, electronic (de)localization, and excited-state proton transfer are correlated with functional properties encompassing optical absorption, fluorescence quantum yield, conductivity, and photostability. Read More

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September 2021

Aggregation-induced emission luminogen with excellent triplet-triplet upconversion efficiency for highly efficient non-doped blue organic light-emitting diodes.

Mater Horiz 2021 Sep 21. Epub 2021 Sep 21.

State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, Center for Aggregation-Induced Emission, South China University of Technology, Guangzhou, Guangdong 510640, China.

By combining aggregation-induced emission (AIE) effect and a triplet-triplet upconversion (TTU) process, a blue emitter with excellent photoluminescence quantum efficiency and high upconversion efficiency in the film state is developed, from which a highly efficient non-doped blue TTU organic light-emitting diode (TTU-OLED) was realized. Read More

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September 2021

A solid-solution modulation strategy in trivalent bismuth-doped gallate phosphors for single substrate tunable emission.

Dalton Trans 2021 Sep 21;50(36):12592-12606. Epub 2021 Sep 21.

Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China.

The synthesis conditions of most phosphors doped with lanthanide ions with d-f transition require a reducing atmosphere. The doping Bi ions selected in this study perfectly avoid this requirement, and they are environmentally friendly and safe. Nevertheless, the spectral tuning of Bi is a great challenge that limits its application. Read More

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September 2021

Tunable Circularly Polarized Luminescence from Single Crystal and Powder of the Simplest Tetraphenylethylene Helicate.

ACS Nano 2021 Sep 21. Epub 2021 Sep 21.

Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

Tetraphenylethylene and its derivatives are a class of aggregation-induced emission (AIE) compounds that are most extensively and successfully studied. It has been found that the simplest TPE is easy to crystallize into homochiral M crystals or P crystals. However, no research on circularly polarized luminescence (CPL) of TPE solid is documented. Read More

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September 2021

Ultraviolet photodetector based on p-borophene/n-ZnO heterojunction.

Nanotechnology 2021 Sep 17. Epub 2021 Sep 17.

College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, No. 29 Yudao Street, Nanjing, Jiangsu, 210016, CHINA.

Borophene has attracted enormous attention because of its rich and unique structural and electronic properties for promising pratical applications. Although borophene sheets have been realized on different substrates in recent experiments, there are very few reports on the device application of borophene. Recently, borophene can be grown on some functional substrates, which lays a good foundation for its potential applications. Read More

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September 2021

Room temperature spontaneous valley polarization in two-dimensional FeClBr monolayer.

Nanoscale 2021 Sep 17;13(35):14807-14813. Epub 2021 Sep 17.

Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, School of Science, Tianjin University, Tianjin 300354, China.

The valley degrees of freedom of Bloch electrons provide a proper platform to realize information storage and processing. Using first principles calculations, we propose that the FeClBr monolayer is a ferromagnetic semiconductor with spontaneous valley polarization owing to the combined effect of magnetic exchange interaction and spin-orbit coupling effect. The FeClBr monolayer shows perpendicular magnetic anisotropy, a high Curie temperature of 651 K and a large valley splitting of 188 meV, which are beneficial for the practical applications in valleytronics. Read More

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September 2021

Unidirectional propagation of the Bloch surface wave excited by the spinning magnetic dipole in two-dimensional photonic crystal slab.

Sci Rep 2021 Sep 16;11(1):18452. Epub 2021 Sep 16.

Department of Physics, Capital Normal University, Beijing, 100048, China.

The photonic spin Hall effect (PSHE) can be realized in a photonic crystal (PC) slab, that is, the unidirectional Bloch surface wave can propagate along the surface of the PC slab under the excitation of elliptical polarized magnetic dipole. It is further proved that PSHE is caused by the interference of the component surface waves excited by the different components of the incident light, which is the so called component wave interference (CWI) theory. In addition, we also find that the spin of the surface wave oscillates periodically in space, and the oscillation period is a unit cell. Read More

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September 2021

Accessing Photoredox Transformations with an Iron(III) Photosensitizer and Green Light.

J Am Chem Soc 2021 Sep 16. Epub 2021 Sep 16.

Université Catholique de Louvain (UCLouvain), Institut de la Matière Condensée et des Nanosciences (IMCN), Molecular Chemistry, Materials and Catalysis (MOST), Place Louis Pasteur 1, bte L4.01.02, 1348 Louvain-la-Neuve, Belgium.

Efficient excited-state electron transfer between an iron(III) photosensitizer and organic electron donors was realized with green light irradiation. This advance was enabled by the use of the previously reported iron photosensitizer, [Fe(phtmeimb)] (phtmeimb = {phenyl[tris(3-methyl-imidazolin-2-ylidene)]borate}, that exhibited long-lived and luminescent ligand-to-metal charge-transfer (LMCT) excited states. A benchmark dehalogenation reaction was investigated with yields that exceed 90% and an enhanced stability relative to the prototypical photosensitizer [Ru(bpy)]. Read More

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September 2021

A novel approach to detect barium in gunshot residue using a handheld device: a forensic application.

Anal Methods 2021 Sep 15. Epub 2021 Sep 15.

Department of Environmental Science, Indira Gandhi University, Meerpur, Rewari, Haryana, India.

The present manuscript describes an innovative handheld device for the rapid detection of barium (Ba) in Gunshot Residue (GSR) based on the use of gold nanomaterials capped with sodium malonate. The method depends on a shift in the Light Scattering Plasmon Resonance (LSPR) peak of malonate capped gold nanoparticles (AuNPs) from 526 nm to 610.5 nm, due to the carboxylate ion aggregation between the metal and the nanoparticles leading to a change in the color. Read More

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September 2021

Hybridized nanolayer modified Ω-shaped fiber-optic synergistically enhances localized surface plasma resonance for ultrasensitive cytosensor and efficient photothermal therapy.

Biosens Bioelectron 2021 Aug 30;194:113599. Epub 2021 Aug 30.

Research Center of Analytical Instrumentation, Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, 710069, Shaanxi, PR China. Electronic address:

Inadequate sensitivity and side-effect are the main challenges to develop cytosensors combining with therapeutic potential simultaneously for cancer diagnosis and treatment. Herein, localized surface plasma resonance (LSPR) based on hybridized nanolayer modified Ω-shaped fiber-optic (HN/Ω-FO) was developed to integrate cytosensor and plasmonic photothermal treatment (PPT). On one hand, hybridized nanolayers improve the coverage of nanoparticles and refractive index sensitivity (RIS). Read More

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Crystal phase transition and polyhedron transformation towards the evolution of photoluminescence and the improvement of thermal stability in efficient blue-emitting BaSrAlSiO:Eu.

Dalton Trans 2021 Sep 14;50(35):12147-12158. Epub 2021 Sep 14.

Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.

Investigations into novel single-phase phosphors with outstanding luminescence properties and excellent thermal stability are urgently needed in the lighting field. In this work, a crystal phase transition and polyhedron transformation strategy cation substitution has been proposed. controlling the Sr/Ba ratio, the structural evolution of the phosphor from a monocelsian phase to a hexacelsian or feldspar phase and the variation of the local environments of Eu sites are correspondingly studied in BaSrAlSiO:0. Read More

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September 2021

Blue TADF Emitters Based on -Heterotriangulene Acceptors for Highly Efficient OLEDs with Reduced Efficiency Roll-Off.

ACS Appl Mater Interfaces 2021 Sep 14. Epub 2021 Sep 14.

Department of Chemistry, University of Ulsan, Ulsan 44610, Republic of Korea.

The design of robust boron acceptors plays a key role in the development of boron-based thermally activated delayed fluorescence (TADF) emitters for the realization of efficient and stable blue organic light-emitting diodes (OLEDs). Herein, we report a set of donor (D)-acceptor (A)-type blue TADF compounds (-) comprising triply bridged triarylboryl acceptors, the so-called -heterotriangulenes, which differ depending on the identity of one of the bridging groups: methylene (), dimethylmethylene (), or oxo (). The X-ray crystal structures of and reveal a highly twisted D-A connectivity and a completely planar geometry for the -heterotriangulene rings. Read More

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September 2021

Azobenzene-Isoxazoline as photopharmacological ligand for optical control of insect GABA receptor and behavior.

Pest Manag Sci 2021 Sep 13. Epub 2021 Sep 13.

Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China.

Background: Photopharmacology is a fast-growing photonics-based technology, which realizes the high-resolution regulation of drugs in time and space through light. The purpose of this research was to introduce photochromic groups into the isoxazoline structure to realize the regulation of γ-Aminobutyric acid receptors (GABARs) targeting and insect behavior.

Results: Azobenzene-Fluralaner analogues, ABF02, ABF03 and ABF04 have been proved to have larvicidal activity against mosquito larvae. Read More

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September 2021

Highly Efficient NaGdF:Ce/Tb Nanoscintillator with Reduced Afterglow and Light Scattering for High-Resolution X-ray Imaging.

ACS Appl Mater Interfaces 2021 Sep 13;13(37):44596-44603. Epub 2021 Sep 13.

Institute for Lasers, Photonics, and Biophotonics and Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States.

Scintillation-based X-ray excited optical luminescence (XEOL) imaging shows great potential applications in the fields of industrial security inspection and medical diagnosis. It is still a great challenge to achieve scintillators simultaneously with low toxicity, high stability, strong XEOL intensity, and weak afterglow as well as simple device processibility with weak light scattering. Herein, we introduce ethylenediaminetetraacetate (EDTA)-capped NaGdF:10Ce/18Tb nanoparticles (NPs) as a highly sensitive nanoscintillator, which meets all of the abovementioned challenges. Read More

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September 2021

Controllable Solution-Phase Epitaxial Growth of Q1D Sb (S,Se) /CdS Heterojunction Solar Cell with 9.2% Efficiency.

Adv Mater 2021 Sep 12:e2104346. Epub 2021 Sep 12.

School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.

Antimony sulfoselenide (Sb (S,Se) ) is a promising photoabsorber for stable and high efficiency thin film photovoltaics (PV). The unique quasi-1D (Q1D) crystal structure gives Sb (S,Se) intriguing anisotropic optoelectronic properties, which intrinsically require the optimization of crystal growth orientation, especially for electronic devices with vertical charge transport such as solar cells. Although the efficiency of Sb (S,Se) solar cells has been improved greatly through optimizing the material quality, the fundamental issue of crystal orientation control in polycrystalline films remains unsolved, resulting in charge carrier recombination losses in the device. Read More

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September 2021

Plasmonic Nanoparticle Lattice Devices for White-Light Lasing.

Adv Mater 2021 Sep 12:e2103262. Epub 2021 Sep 12.

Graduate Program in Applied Physics, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA.

A plasmonic nanolaser architecture that can produce white-light emission is reported. A laser device is designed based on a mixed dye solution used as gain material sandwiched between two aluminum nanoparticle (NP) square lattices of different periodicities. The (±1, 0) and (±1, ±1) band-edge surface lattice resonance (SLR) modes of one NP lattice and the (±1, 0) band-edge mode of the other NP lattice function as nanocavity modes for red, blue, and green lasing respectively. Read More

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September 2021

Radical-Doped Crystalline Lanthanide-Based Photochromic Complexes: Self-Assembly Driven by Multiple Interactions and Photoswitchable Luminescence.

Inorg Chem 2021 Sep 9;60(18):14286-14293. Epub 2021 Sep 9.

College of Materials and Chemical Engineering, Pingxiang University, Pingxiang, Jiangxi 337055, P. R. China.

Stimuli-responsive functional materials, especially the light stimulation color change and tunable fluorescent materials, have received considerable attention because of their broad applications in smart materials. Herein, a series of lanthanide-based [Ln = Nd(III) (), Sm(III) (), Eu(III) (), Gd(III) (), Tb(III) (), Yb(III) (), and Lu(III) ()] crystalline complexes were attained by simply adding the aqueous lanthanide nitrate solution to the water-soluble naphthalenediimide derivative. The obtained lanthanide-based crystalline materials not only show significant photochromism but also possess reactive organic radicals under ambient conditions. Read More

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September 2021

Carotenoids Do Not Protect Bacteriochlorophylls in Isolated Light-Harvesting LH2 Complexes of Photosynthetic Bacteria from Destructive Interactions with Singlet Oxygen.

Molecules 2021 Aug 24;26(17). Epub 2021 Aug 24.

Institute of Basic Biological Problems RAS, 142290 Pushchino, Russia.

The effect of singlet oxygen on light-harvesting (LH) complexes has been studied for a number of sulfur (S) and nonsulfur (S) photosynthetic bacteria. The visible/near-IR absorption spectra of the standard LH2 complexes (B800-850) of (.) (S), (. Read More

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Role of carbon quantum dots on Nickel titanate to promote water oxidation reaction under visible light illumination.

J Colloid Interface Sci 2021 Sep 1;607(Pt 1):203-209. Epub 2021 Sep 1.

State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, PR China. Electronic address:

Water oxidation reaction (WOR) is the heart for overall water splitting owing to its sluggish kinetics. Herein, carbon quantum dots (CQDs) are studied as co-catalyst to promote WOR by loading them on NiTiO (NTO) photocatalyst. The performance can be obtained in a fold of 7 compared with pristine NTO in power-based photocatalytic system, and strong stability has received with preserving the output for at least 10 h. Read More

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September 2021

Tunable Photoresponsive Behaviors Based on Triphenylamine Derivatives: The Pivotal Role of π-Conjugated Structure and Corresponding Application.

Adv Mater 2021 Sep 9:e2104002. Epub 2021 Sep 9.

Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300072, China.

Photoresponsive materials have drawn much attention and are widely applied in daily life for their reversible changes in luminous color or appearance color under light irradiation. In this work, a new photoresponsive system based on triarylamine derivatives is developed. With the changed aryl substituents, adjustable photoresponsive properties, including photoactivated phosphorescence and photochromism after being dispersed into the poly(methyl methacrylate) (PMMA) matrix, are demonstrated. Read More

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September 2021

Vertically stacked BiSe/MoTe heterostructure with large band offsets for nanoelectronics.

Nanoscale 2021 Sep 23;13(36):15403-15414. Epub 2021 Sep 23.

Institute of Semiconductors, South China Normal University, Guangzhou 510631, P. R. China.

In recent years, two-dimensional material-based tunneling heterojunctions are emerging as a multi-functional architecture for logic circuits and photodetection owing to the flexible stacking, optical sensitivity, tunable detection band, and highly controllable conductivity behaviors. However, the existing structures are mainly focused on transition or post-transition metal chalcogenides and have been rarely investigated as topological insulator (such as BiSe or BiTe)-based tunneling heterostructures. Meanwhile, it is challenging to mechanically exfoliate the topological insulator thin nanoflakes because of the strong layer-by-layer interaction with shorter interlayer spacing. Read More

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September 2021

Establishment and validation of a computer-assisted colonic polyp localization system based on deep learning.

World J Gastroenterol 2021 Aug;27(31):5232-5246

Department of Gastroenterology, Changhai Hospital, Second Military Medical University/Naval Medical University, Shanghai 200433, China.

Background: Artificial intelligence in colonoscopy is an emerging field, and its application may help colonoscopists improve inspection quality and reduce the rate of missed polyps and adenomas. Several deep learning-based computer-assisted detection (CADe) techniques were established from small single-center datasets, and unrepresentative learning materials might confine their application and generalization in wide practice. Although CADes have been reported to identify polyps in colonoscopic images and videos in real time, their diagnostic performance deserves to be further validated in clinical practice. Read More

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High-fidelity laser-free universal control of trapped ion qubits.

Nature 2021 09 8;597(7875):209-213. Epub 2021 Sep 8.

National Institute of Standards and Technology, Boulder, CO, USA.

Universal control of multiple qubits-the ability to entangle qubits and to perform arbitrary individual qubit operations-is a fundamental resource for quantum computing, simulation and networking. Qubits realized in trapped atomic ions have shown the highest-fidelity two-qubit entangling operations and single-qubit rotations so far. Universal control of trapped ion qubits has been separately demonstrated using tightly focused laser beams or by moving ions with respect to laser beams, but at lower fidelities. Read More

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September 2021

Arbitrarily Reconfigurable and Thermadapt Reversible Two-Way Shape Memory Poly(thiourethane) Accomplished by Multiple Dynamic Covalent Bonds.

ACS Appl Mater Interfaces 2021 Sep 7;13(36):43426-43437. Epub 2021 Sep 7.

CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.

The fabrication of a single polymer network that exhibits a good reversible two-way shape memory effect (2W-SME), can be formed into arbitrarily complex three-dimensional (3D) shapes, and is recyclable remains a challenge. Herein, we design and fabricate poly(thiourethane) (PTU) networks with an excellent thermadapt reversible 2W-SME, arbitrary reconfigurability, and good recyclability via the synergistic effects of multiple dynamic covalent bonds (i.e. Read More

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September 2021

[Development of a portable micro-liquid chromatograph].

Se Pu 2021 Sep;39(9):1030-1037

College of Chemistry and Chemical Engineering, Xiamen University, the MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Xiamen 361005, China.

Portable analytical instruments find extensive application in on-site examination because of their significant advantages: these instruments are convenient and easy-to-carry, leading to high time-effectiveness, and involve low reagent consumption. We report a portable micro-liquid chromatograph (-μLC) that was designed and fabricated in our laboratory. The -μLC integrates homemade dual large-thrust syringe pumps for delivering the mobile phase, a capillary polymer monolithic column as the stationary phase for the separation of the target analytes, and a specially designed dual-functional optical-fiber microflow-cell for online detection. Read More

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September 2021