6,427 results match your criteria complex film


Molecular dynamics simulation for membrane separation and porous materials: A current state of art review.

J Mol Graph Model 2021 Jun 5;107:107947. Epub 2021 Jun 5.

Department of Chemical and Biological Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskatchewan, S7N 5A9, Canada; Division of Biomedical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskatchewan, S7N 5A9, Canada. Electronic address:

Computational frameworks have been under specific attention within the last two decades. Molecular Dynamics (MD) simulations, identical to the other computational approaches, try to address the unknown question, lighten the dark areas of unanswered questions, to achieve probable explanations and solutions. Owing to their complex microporous structure on one side and the intricate biochemical nature of various materials used in the structure, separative membrane materials possess peculiar degrees of complications. Read More

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Surface-Enhanced Raman Scattering-Active Plasmonic Metal Nanoparticle-Persistent Luminescence Material Composite Films for Multiple Illegal Dye Detection.

Anal Chem 2021 Jun 14. Epub 2021 Jun 14.

Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, International Joint Research Center for Photoresponsive Molecules and Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China.

Uniform two-dimensional plasmonic nanoparticle (NP)-semiconductor composite films could retard the attenuation of electromagnetic evanescent wave and show intensive Raman activity for the multiplex monitoring of hazards in a practical food matrix. Here, an efficient Raman platform is developed by employing a plasmonic nanoparticle (NP)-persistent luminescence material (PLM) composite film. PLM show upconversion photoluminescence (UCPL) properties. Read More

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Microfibrillated cellulose films containing chitosan and tannic acid for wound healing applications.

J Mater Sci Mater Med 2021 Jun 12;32(6):67. Epub 2021 Jun 12.

Department of Paper sciences and engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.

The effectiveness of tannic acid as antimicrobial and wound healing for burns have been shown for a century; however, uncontrolled target dosage may result in undesirable side-effects. Remarkably, tannic acid polyphenols compounds crosslinked with polymeric materials produce a strong composite containing the beneficial properties of this tannin. However, investigation of the crosslink structure and its antibacterial and regenerative properties are still unknown when using nanocellulose by mechanical defibrillation; additionally, due to the potential crosslink structure with chitosan, its structure can be complex. Read More

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Facile, scalable, and adaptive infrared reflection towards soft systems by blowing a Janus rubber film.

iScience 2021 May 16;24(5):102430. Epub 2021 Apr 16.

State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China.

Controllable IR-reflection systems can be applied to displays, adaptive military camouflages, thermal managements, and many other fields. However, current reported controllable IR-reflection systems suffer from utilizing rigid materials, complicated devices, or high working temperature/voltage, which are not suitable for their widespread applications toward soft systems. Herein, inspired by cephalopods, we demonstrate a facile and scalable method for adaptive IR reflection based on a Janus rubber film, which is composed of aluminum-coated microsheets (AMSs)/rubber composite top and a rubber only bottom. Read More

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Dosimetric evaluation of a patient-specific 3D-printed oral positioning stent for head-and-neck radiotherapy.

Phys Eng Sci Med 2021 Jun 10. Epub 2021 Jun 10.

Royal Brisbane and Women's Hospital, Herston, QLD, 4029, Australia.

As head-and-neck radiotherapy treatments become more complex and sophisticated, and the need to control and stabilise the positioning of intra-oral anatomy becomes more important, leading the increasing use of oral positioning stents during head-and-neck radiotherapy simulation and delivery. As an alternative to the established practice of creating oral positioning stents using wax, this study investigated the use of a 3D printing technique. An Ender 5 3D printer (Creality 3D, Shenzhen, China) was used, with PLA+ "food-safe" polylactic acid filament (3D Fillies, Dandenong South, Australia), to produce a low-density 3D printed duplicate of a conventional wax stent. Read More

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Broadband infrared photodetection using a narrow bandgap conjugated polymer.

Sci Adv 2021 Jun 9;7(24). Epub 2021 Jun 9.

Center for Optoelectronic Materials and Devices, School of Polymer Science and Engineering, The University of Southern Mississippi, Hattiesburg, MS 39406, USA.

Photodetection spanning the short-, mid-, and long-wave infrared (SWIR-LWIR) underpins modern science and technology. Devices using state-of-the-art narrow bandgap semiconductors require complex manufacturing, high costs, and cooling requirements that remain prohibitive for many applications. We report high-performance infrared photodetection from a donor-acceptor conjugated polymer with broadband SWIR-LWIR operation. Read More

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DRY EYE DISEASE. A REVIEW.

Authors:
M Zemanová

Cesk Slov Oftalmol 2020 ;1(Ahead of print):1-13

This article provides a comprehensive view of the issue of dry eye. It emphasizes provisions of the Tear Film and Ocular Surface Society, discusses the new classification and definition of dry eye based on its pathophysiology, and emphasizes the correct diagnostic and therapeutic approaches, which appears in the form of algorithms. Dry eye is a multifactorial disease of the ocular surface characterized by a loss of homeostasis of the tear film, and accompanied by ocular symptoms, in which tear film instability and hyperosmolarity, ocular surface inflammation and damage, and neurosensory abnormalities play etiological roles. Read More

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Domain state modulation by interfacial diffusion in FePt/FeCo thin films: Experimental approach with micromagnetic modelling.

J Phys Condens Matter 2021 Jun 9. Epub 2021 Jun 9.

Department of Physics and Astrophysics, University of Delhi, University Road, New Delhi, Delhi, 110007, INDIA.

We report the complex implications of inter-diffusion between polycrystalline FePt/FeCo layers as an impact of the FeCo underlayer on the structural and magnetic properties of the system. The crystalline growth of FePt strongly reduces in an entirely diffused system compared to the one with lesser diffusion, while the crystalline structure of FeCo is apparently less affected. Charge redistribution occurs between Fe, Co and Pt ensuring increased Co - Pt and Fe - Pt interactions with higher diffusion. Read More

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Macaque monkey trigeminal blink reflex circuits targeting levator palpebrae superioris motoneurons.

J Comp Neurol 2021 Jun 7. Epub 2021 Jun 7.

Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, Jackson, Mississippi, USA.

For normal viewing, the eyes are held open by the tonic actions of the levator palpebrae superioris (levator) muscle raising the upper eyelid. This activity is interrupted during blinks, when the eyelid sweeps down to spread the tear film or protect the cornea. We examined the circuit connecting the principal trigeminal nucleus to the levator motoneurons by use of both anterograde and retrograde tracers in macaque monkeys. Read More

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Pattern-Potential-Guided Growth of Textured Macromolecular Films on Graphene/High-Index Copper.

Adv Mater 2021 Jun 6:e2006836. Epub 2021 Jun 6.

State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Cyrus Tang Center for Sensor Materials and Application, Zhejiang University, Hangzhou, 310027, China.

Macromolecular films are crucial functional materials widely used in the fields of mechanics, electronics, optoelectronics, and biology, due to their superior properties of chemical stability, small density, high flexibility, and solution-processing ability. Their electronic and mechanical properties, however, are typically much lower than those of crystalline materials, as the macromolecular films have no long-range structural ordering. The state-of-the-art for producing highly ordered macromolecular films is still facing a great challenge due to the complex interactions between adjacent macromolecules. Read More

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Exploring a new free-standing polyelectrolyte (PEM) thin film as a predictive tool for drug-mucin interactions: Insights on drug transport through mucosal surfaces.

Int J Pharm 2021 Jun 2;604:120764. Epub 2021 Jun 2.

Unidad de Investigación y Desarrollo en TecnologíaFarmacéutica (UNITEFA), CONICET and Departamento de CienciasFarmacéuticas, Facultad de CienciasQuímicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000-HUA Córdoba, Argentina. Electronic address:

The main objective of the present work was to design a biomimetic free-standing multilayered PEM film, constructed by the layer-by-layer (LbL) assembly approach, based on natural biopolymers and intended to recreate the complex mucus-mimetic matrices in order to provide mechanistic insights into biophysical interactions between drugs and the physiological gel-forming mucin network of mucus that covers the mucosal epithelia named as(CS/ALG)/(PGM) PEM film. The obtained results indicate that mucin may delay or increase drug precipitation on the mucus layer, depending on specific drug-mucin interactions driving drug supersaturation or drug crystallization phenomena. It was found that the drug lipophilicity characteristics governed the mucin binding degree, which had an influencing role on the drug translocation across this gel-like hydrogel. Read More

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Voltammetric detection of vitamin D employing Au-MoS hybrid as immunosensing platform.

Mikrochim Acta 2021 Jun 4;188(7):222. Epub 2021 Jun 4.

Department of Biochemistry, Panjab University, Chandigarh, 160014, India.

A voltammetric immunosensor based on molybdenum sulphide (MoS) and gold nanoparticles (Au NPs) for the determination of 25-hydroxy vitamin D (25(OH)D) is reported. Anti-vit D (Ab-25(OH)D) was immobilized onto the cysteamine-modified MoS and Au NPs which were deposited onto a fluoride tin oxide (FTO) electrode (Ab/Cys/Au/MoS/FTO). The MoS sheets were prepared by hydrothermal method followed by an in situ growth of Au film onto the MoS/FTO surface. Read More

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In Situ Growth Large Area Silver Nanostructure on Metal Phenolic Network Coated NAAO Film and Its SERS Sensing Application for Monofluoroacetic Acid.

ACS Sens 2021 Jun 3. Epub 2021 Jun 3.

Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food poisoning, Beijing Center for Disease Prevention and Control, Beijing 100013, China.

Rapid screening monofluoroacetic acid (FAcOH) is responsible for preventing chemical poisoning and food safety events. Whereas surface enhanced Raman scattering (SERS) spectra is an effective tool for detecting forbidden chemicals, it is difficult to directly detect FAcOH due to its small Raman scattering cross section as well as weak adsorption on SERS substrates. In this work, the metal phenolic supramolecular networks (MPNs, i. Read More

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Physiological fluid interfaces: Functional microenvironments, drug delivery targets, and first line of defense.

Acta Biomater 2021 May 30. Epub 2021 May 30.

Institute of Food Nutrition and Health, ETH Zurich, 8092 Zurich, Switzerland. Electronic address:

Fluid interfaces, i.e. the boundary layer of two liquids or a liquid and a gas, play a vital role in physiological processes as diverse as visual perception, oral health and taste, lipid metabolism, and pulmonary breathing. Read More

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Novel 2,3-Dialdehyde Cellulose-Based Films with Photodynamic Inactivation Potency by Incorporating the β-Cyclodextrin/Curcumin Inclusion Complex.

Biomacromolecules 2021 Jun 2. Epub 2021 Jun 2.

College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China.

Antibacterial packaging film mediated by photodynamic inactivation (PDI) is a new concept in food industry. The objective of this study was to fabricate a green 2,3-dialdehyde cellulose (DAC)-based antimicrobial film with PDI potency by incorporating the β-cyclodextrin/curcumin (β-CD/Cur) complex as a photosensitizer. The PDI-mediated films were characterized by evaluating the surface morphology, chemical structure, light transmittance, mechanical properties, photochemical and thermal stability, and water solubility. Read More

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Thermoelectric properties of CZTS thin films: effect of Cu-Zn disorder.

Phys Chem Chem Phys 2021 Jun;23(23):13148-13158

Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy.

Cu-Zn disorder is known to deeply affect kesterite (Cu2ZnSnS4, CZTS) due to the low temperature order-disorder phase transition, leading to a random occupation of the two cations in the shared crystallographic planes. This defect complex has been extensively studied in the thin film photovoltaic sector, with considerable efforts in developing methods to quantify disorder. In this study, a preliminary investigation of thermoelectric properties in temperature for thin film CZTS is presented. Read More

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Transparent Ion-Exchange Membrane Exhibiting Intense Emission under a Specific pH Condition Based on Polypyridyl Ruthenium(II) Complex with Two Imidazophenanthroline Groups.

Membranes (Basel) 2021 May 27;11(6). Epub 2021 May 27.

Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan.

The development and the photophysical behavior of a transparent ion-exchange membrane based on a pH-sensitive polypyridyl ruthenium(II) complex, [(bpy)Ru(Hbpib)Ru(bpy)](ClO) (bpy = 2,2'-bipyridine, Hbpib = 1,4-bis([1,10]phenanthroline[5,6-]-imidazol-2-yl)benzene), are experimentally and theoretically reported. The emission spectra of [(bpy)Ru(Hbpib)Ru(bpy)]@Nafion film were observed between pH 2 and pH 11 and showed the highest relative emission intensity at pH 5 ( = 594.4 nm). Read More

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Thermal Properties and Structural Features of Multilayer Films Based on Chitosan and Anionic Polysaccharides.

Biomolecules 2021 May 19;11(5). Epub 2021 May 19.

Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi pr. VO 31, 199004 St. Petersburg, Russia.

This study investigates the thermal and structural properties of multilayer composites based on chitosan (CS) and polyanions with different functionalities, including sodium sulfoethyl cellulose (SEC), sodium alginate (ALG), and sodium hyaluronate (HA). Unlike polyelectrolyte complexes (PECs) obtained by polymer mixing, the formation of a PEC layer by a process of layer-by-layer deposition of oppositely charged polymers is accompanied by the transformation of the CS polymorphic state, and this affects the relaxation and thermal properties of the resulting multilayer composite. X-ray diffraction analysis showed that the formation of the PEC layer in the CS/SEC multilayer film is accompanied by crystallization of the CS chains and the formation of a predominantly anhydrous CS modification. Read More

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Polymeric Dopant-Free Hole Transporting Materials for Perovskite Solar Cells: Structures and Concepts towards Better Performances.

Polymers (Basel) 2021 May 19;13(10). Epub 2021 May 19.

Department of Chemistry and NIS Interdepartmental Center and INSTM Reference Centre, University of Torino, Via Pietro Giuria 7, 10125 Torino, Italy.

Perovskite solar cells are a hot topic of photovoltaic research, reaching, in few years, an impressive efficiency (25.5%), but their long-term stability still needs to be addressed for industrial production. One of the most sizeable reasons for instability is the doping of the Hole Transporting Material (HTM), being the salt commonly employed as a vector bringing moisture in contact with perovskite film and destroying it. Read More

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Characteristics and Electronic Band Alignment of a Transparent -CuI/-SiZnSnO Heterojunction Diode with a High Rectification Ratio.

Nanomaterials (Basel) 2021 May 7;11(5). Epub 2021 May 7.

Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea.

Transparent -CuI/-SiZnSnO (SZTO) heterojunction diodes are successfully fabricated by thermal evaporation of a (111) oriented -CuI polycrystalline film on top of an amorphous -SZTO film grown by the RF magnetron sputtering method. A nitrogen annealing process reduces ionized impurity scattering dominantly incurred by Cu vacancy and structural defects at the grain boundaries in the CuI film to result in improved diode performance; the current rectification ratio estimated at ±2 V is enhanced from ≈10 to ≈10. Various diode parameters, including ideality factor, reverse saturation current, offset current, series resistance, and parallel resistance, are estimated based on the Shockley diode equation. Read More

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Regenerable ZnO/GaAs Bulk Acoustic Wave Biosensor for Detection of in "Complex" Biological Medium.

Biosensors (Basel) 2021 May 7;11(5). Epub 2021 May 7.

Laboratory for Quantum Semiconductors and Photon-Based BioNanotechnology, Interdisciplinary Institute for Technological Innovation (3IT), Laboratoire Nanotechnologies Nanosystèmes (LN2), CNRS UMI-3463, Université de Sherbrooke, Sherbrooke, Québec, QC J1K 0A5, Canada.

A regenerable bulk acoustic wave (BAW) biosensor is developed for the rapid, label-free and selective detection of in liquid media. The geometry of the biosensor consists of a GaAs membrane coated with a thin film of piezoelectric ZnO on its top surface. A pair of electrodes deposited on the ZnO film allows the generation of BAWs by lateral field excitation. Read More

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Communicative Interaction with and without Eye-Gaze Technology between Children and Youths with Complex Needs and Their Communication Partners.

Int J Environ Res Public Health 2021 May 12;18(10). Epub 2021 May 12.

Department of Special Education, Stockholm University, Se-106 91 Stockholm, Sweden.

Use of eye-gaze assistive technology (EGAT) provides children/youths with severe motor and speech impairments communication opportunities by using eyes to control a communication interface on a computer. However, knowledge about how using EGAT contributes to communication and influences dyadic interaction remains limited.

Aim: By video-coding dyadic interaction sequences, this study investigates the impacts of employing EGAT, compared to the Non-EGAT condition on the dyadic communicative interaction. Read More

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A Novel Cobalt Metallopolymer with Redox-Matched Conjugated Organic Backbone via Electropolymerization of a Readily Available N Cobalt Complex.

Authors:
Mikhail Karushev

Polymers (Basel) 2021 May 20;13(10). Epub 2021 May 20.

Ioffe Physical-Technical Institute of the Russian Academy of Sciences (Ioffe Institute), 26 Politekhnicheskaya str., 194021 St. Petersburg, Russia.

Fast and reversible cobalt-centered redox reactions in metallopolymers are the key to using these materials in energy storage, electrocatalytic, and sensing applications. Metal-centered electrochemical activity can be enhanced via redox matching of the conjugated organic backbone and cobalt centers. In this study, we present a novel approach to redox matching via modification of the cobalt coordination site: a conductive electrochemically active polymer was electro-synthesized from [Co(Amben)] complex (Amben = -bis(-aminobenzylidene)ethylenediamine) for the first time. Read More

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Deep-Ultraviolet Transparent Conductive MWCNT/SiO Composite Thin Film Fabricated by UV Irradiation at Ambient Temperature onto Spin-Coated Molecular Precursor Film.

Nanomaterials (Basel) 2021 May 20;11(5). Epub 2021 May 20.

Department of Applied Physics, School of Advanced Engineering, Kogakuin University, Tokyo 192-0015, Japan.

Deep-ultraviolet (DUV) light-transparent conductive composite thin films, consisting of dispersed multiwalled carbon nanotubes (MWCNTs) and SiO matrix composites, were fabricated on a quartz glass substrate. Transparent and well-adhered amorphous thin films, with a thickness of 220 nm, were obtained by weak ultraviolet (UV) irradiation (4 mW cm at 254 nm) for more than 6 h at 20-40 °C onto the precursor films, which were obtained by spin coating with a mixed solution of MWCNT in water and Si(IV) complex in ethanol. The electrical resistivity of MWCNT/SiO composite thin film is 0. Read More

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Thickness-Dependent Photoelectrochemical Water Splitting Properties of Self-Assembled Nanostructured LaFeO Perovskite Thin Films.

Nanomaterials (Basel) 2021 May 21;11(6). Epub 2021 May 21.

National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele, Romania.

Tuning the intrinsic structural and stoichiometric properties by different means is used for increasing the green energy production efficiency of complex oxide materials. Here, we report on the formation of self-assembled nanodomains and their effects on the photoelectrochemical (PEC) properties of LaFeO (LFO) epitaxial thin films as a function of layer's thickness. The variation with the film's thickness of the structural parameters such as in-plane and out-of-plane crystalline coherence length and the coexistence of different epitaxial orientation-<100>SrTiO//<001> LFO, <100>SrTiO//<110> LFO and [110] LFO//[10] STO, as well as the appearance of self-assembled nanodomains for film's thicknesses higher than 14 nm, is presented. Read More

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Effect of Benzotriazole on the Localized Corrosion of Copper Covered with Carbonaceous Residue.

Materials (Basel) 2021 May 21;14(11). Epub 2021 May 21.

School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea.

Carbonaceous residues on copper pipes during the manufacturing process are known to be one of the main causes of pitting corrosion on copper pipes. This study examined the corrosion-inhibiting effect of benzotriazole (BTA) on C12200 copper pipes with carbonaceous film in synthetic tap water. In the absence of BTA, localized corrosion mechanisms due to galvanic corrosion, crevice corrosion, and oxygen-concentration cell were proposed in the boundary part of the carbonaceous film on the copper through X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS) analyses. Read More

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Tunable dual-channel ultra-narrowband Bragg grating filter on thin-film lithium niobate.

Opt Lett 2021 Jun;46(11):2730-2733

We demonstrate dual-channel phase-shifted Bragg grating filters in the telecom band on thin-film lithium niobate. These integrated tunable ultra-narrow linewidth filters are crucial components for optical communication and sensing systems, as well as future quantum-photonic applications. Thin-film lithium niobate is an emerging platform suitable for these applications and has been exploited in this Letter. Read More

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Visco-Poroelastic Electrochemiluminescence Skin with Piezo-Ionic Effect.

Adv Mater 2021 Jun 1:e2100321. Epub 2021 Jun 1.

Department of Chemical and Biomolecular Engineering, Institute of Emergent Materials, Sogang University, Seoul, 04107, Republic of Korea.

Following early research efforts devoted to achieving excellent sensitivity of electronic skins, recent design schemes for these devices have focused on strategies for transduction of spatially resolved sensing data into straightforward user-adaptive visual signals. Here, a material platform capable of transducing mechanical stimuli into visual readout is presented. The material layer comprises a mixture of an ionic transition metal complex luminophore and an ionic liquid (capable of producing electrochemiluminescence (ECL)) within a thermoplastic polyurethane matrix. Read More

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Design and development of Schiffs base (SB)-modified polylactic acid (PLA) antimicrobial film for packaging applications.

Polym Bull (Berl) 2021 May 21:1-20. Epub 2021 May 21.

Department of Chemistry, College of Engineering Guindy, Anna University, Chennai, 600025 India.

SB compounds were synthesized from (para, ortho, meta)-phenylenediamine as a cross-linking agent through vanillin. The chemical structure of the formed SB complexes is confirmed by FT-IR spectroscopy. Among the three complexes, para-phenylenediamine (p-SB), possessing a stable resonance structure with the lowest steric repulsion, was obtained in the highest yield of 87%. Read More

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Self-Templated, Enantioselective Assembly of an Amyloid-like Dipeptide into Multifunctional Hierarchical Helical Arrays.

ACS Nano 2021 May 28. Epub 2021 May 28.

School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, People's Republic of China.

Chiral self-assembly of peptides has attracted great interest owing to their promising applications in biomedicine, chemistry, and materials science. However, compared with the rich knowledge about their chiral self-assembly at the molecular or nanoscale, the formation of long-range-ordered hierarchical helical arrays (HHAs) from simple peptides remains a formidable challenge. Herein, we report the self-templated assembly of an amyloid-like dipeptide into long-range-ordered HHAs by their spontaneous fibrillization and hierarchical helical assembly within a confined film. Read More

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