118 results match your criteria janus film

Multilayer for Radiative Cooling and Heating in Double-Side Photonic Thermal System.

ACS Appl Mater Interfaces 2021 Sep 30;13(36):42813-42821. Epub 2021 Aug 30.

Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China.

The temperature of outdoor structures, such as automobiles, buildings, and clothing, can be tuned by designing photonic properties. However, particular challenges arise when considering the temperature of an object itself rather than the enclosure in these outdoor structures. We present a double-side photonic thermal (DSPT) system. Read More

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September 2021

Electron-to Hole Transport Change Induced by Solvent Vapor Annealing of Naphthalene Diimide Doped with Poly(3-Hexylthiophene).

Front Chem 2021 5;9:703710. Epub 2021 Aug 5.

Department of Physical and Quantum Chemistry, Faculty of Chemistry, Wroclaw University of Science and Technology, Wroclaw, Poland.

Herein we report on fabrication and properties of organic field-effect transistors (OFETs) based on the spray-coated films of N,N'-dioctyl naphthalene diimide (NDIC8) doped with 2.4 wt% of poly (3-hexylthiophene) (P3HT). OFETs with the untreated NDIC8:P3HT films revealed electron conductivity [μ* = 5 × 10 cm×(Vs)]. Read More

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Pyroelectricity of Lead Sulfide (PbS) Quantum Dot Films Induced by Janus-Ligand Shells.

ACS Nano 2021 Aug 17. Epub 2021 Aug 17.

Chemistry & Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States.

Asymmetry is an essential property to control. To do that in nanocrystalline systems we have developed methods to produce Janus-ligand shells on otherwise symmetric PbS quantum dots (QDs). Here, we demonstrate that control by constructing a system that exhibits pyroelectricity built from spherical PbS QDs. Read More

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Induced half-metallic characteristics and enhanced magnetic anisotropy in the two-dimensional Janus VIBr monolayer by graphyne adsorption.

Phys Chem Chem Phys 2021 Aug 4;23(32):17338-17347. Epub 2021 Aug 4.

Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.

The recent emergence of two-dimensional (2D) Janus materials has opened a new avenue for spintronic and optoelectronic applications. However, 2D magnetic Janus materials and Janus monolayer-based magnetic heterostructures are yet to be fully studied. Herein, the stability and electronic structure of 2D Janus VIBr and VICl monolayers, and the electronic and magnetic properties of 2D graphyne/Janus VIBr (γ-GY/VIBr) heterostructures are calculated based on the density functional theory. Read More

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Active, Yet Little Mobility: Asymmetric Decomposition of HO Is Not Sufficient in Propelling Catalytic Micromotors.

J Am Chem Soc 2021 Aug 2;143(31):12154-12164. Epub 2021 Aug 2.

School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong 518055, China.

A popular principle in designing chemical micromachines is to take advantage of asymmetric chemical reactions such as the catalytic decomposition of HO. Contrary to intuition, we use Janus micromotors half-coated with platinum (Pt) or catalase as an example to show that this ingredient is not sufficient in powering a micromotor into self-propulsion. In particular, by annealing a thin Pt film on a SiO microsphere, the resulting microsphere half-decorated with discrete Pt nanoparticles swims ∼80% more slowly than its unannealed counterpart in HO, even though they both catalytically produce comparable amounts of oxygen. Read More

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Molecular dynamics study on structural and atomic evolution between Au and Ni nanoparticles through coalescence.

Sci Rep 2021 Jul 29;11(1):15432. Epub 2021 Jul 29.

School of Physics, Beihang University, Beijing, 100191, China.

Motivated by the structure evolution experiments of Janus NiAu nanoparticles (NPs), we present a detailed study on the thermodynamic evolution of Ni and Au NPs with different ratios of Au and Ni through the molecular dynamics (MD) simulations. It is found that, for fixed Ni particle size (5.8 nm in diameter), the energy variation with the increasing temperature is related to the Au sizes (1. Read More

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

J Colloid Interface Sci 2021 Nov 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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November 2021

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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Hierarchical Hydrophilic/Hydrophobic/Bumpy Janus Membrane Fabricated by Femtosecond Laser Ablation for Highly Efficient Fog Harvesting.

ACS Appl Mater Interfaces 2021 Jun 27;13(22):26542-26550. Epub 2021 May 27.

CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China.

The shortage of freshwater is threatening sustainable economic development and ecological security worldwide. Janus membrane, as a highly efficient method to collect the invisible fog water in the wet environment, is still hindered by some inherent limitations: (1) poor condensation of fog droplets on the superhydrophobic side due to the ultralow adhesive force of droplets with substrate and (2) insufficient detachment of droplets from the superhydrophilic side in time, which hampers the continuous water transport in the micropores. Herein, inspired by the desert beetle's back with alternating hydrophobic/hydrophilic bumps and the cactus thorn with an asymmetric geometry, we design and fabricate a kind of hierarchical hydrophilic/hydrophobic/bumpy Janus (HHHBJ) membrane by femtosecond laser ablation on an aluminum membrane to achieve the self-driven fog collection, which achieves over 250% enhancement in the water collection efficiency over the conventional Janus membrane. Read More

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Harnessing Wrinkling Patterns Using Shape Memory Polymer Microparticles.

ACS Appl Mater Interfaces 2021 May 5;13(19):23074-23080. Epub 2021 May 5.

Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 YiKuang Street, P.O. Box 3011, Harbin 150080, PR China.

Shape memory polymers (SMPs) are the simplest and most attractive alternatives for soft substrates of typical bilayer wrinkle systems because of shape fixity and recovery capabilities. Herein, we have successfully programmed large compressive strains in chemical cross-linking shape memory polystyrene (PS) microparticles via nanoimprint lithography, which acted as the substrate of a wrinkle system using a gold nanoparticle (Au NP) film as the top layer. When triggered by two different stimuli (direct heating and toluene vapors), the thin Au NP film could transform into various wrinkle structures atop the recovered PS particles. Read More

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Preparation of an amphiphilic Janus SiO/fluorinated polyacrylate latex film and its application as a hydrophobic fabric agent.

J Colloid Interface Sci 2021 Oct 16;599:88-99. Epub 2021 Apr 16.

College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China; National Demonstration Center for Experimental Light Chemistry Engineering Education Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China; Xi'an Key Laboratory of Green Chemicals and Functional Materials, Shaanxi University of Science and Technology, Xi'an 710021, China.

Amphiphilic Janus particles are characterized by their anisotropic morphology and unique physical and chemical properties. In the present research, amphiphilic Janus particles were used as stabilizing agents to prepare a fluorine-containing polyacrylate composite emulsion. The influences of the structure and dosage of amphiphilic Janus SiO particles and the amount of fluorine-containing monomer hexafluorobutyl methacrylate on the stability of the composite emulsion were investigated. Read More

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October 2021

Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives.

Membranes (Basel) 2021 Apr 27;11(5). Epub 2021 Apr 27.

Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.

Fabrication of block copolymer (BCP) template-assisted nano-catalysts has been a subject of immense interest in the field of catalysis and polymer chemistry for more than two decades now. Different methods, such as colloidal route, on-substrate methods, bulk self-assembly approaches, combined approaches, and many others have been used to prepare such nano-catalysts. The present review focuses on the advances made in this direction using diblock, triblock, and other types of BCP self-assembled structures. Read More

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Autoperforation of two-dimensional materials to generate colloidal state machines capable of locomotion.

Faraday Discuss 2021 04 14;227:213-232. Epub 2021 Jan 14.

Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

A central ambition of the robotics field has been to increasingly miniaturize such systems, with perhaps the ultimate achievement being the synthetic microbe or cell sized machine. To this end, we have introduced and demonstrated prototypes of what we call colloidal state machines (CSMs) as particulate devices capable of integrating sensing, memory, and energy harvesting as well as other functions onto a single particle. One technique that we have introduced for creating CSMs based on 2D materials such as graphene or monolayer MoS is "autoperforation", where the nanometer-scale film is fractured around a designed strain field to produce structured particles upon liftoff. Read More

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Active calibration reference of minimized height for characterization of scanning thermal microscopy systems.

Ultramicroscopy 2021 Feb 2;221:113188. Epub 2020 Dec 2.

Wroclaw University of Technology, ul. Janiszewskiego 32/46, Wrocław, 50-372, Poland.

In this paper we describe the design, technology and application of a test and reference sample for calibration and characterization of scanning thermal microscopy (SThM) probes and systems. In our solution temperature field in thin film structure, which is being contacted with the thermal tip is controlled in the traceable manner. The developed technology, integrating plasma etching of Pt and chemical-mechanical planarization (CMP) processing, enabled manufacturing a nanosize 100 nm thick Pt resistor on SiO with topography profile below 10 nm. Read More

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February 2021

Path-Dependent Thermal Metadevice beyond Janus Functionalities.

Adv Mater 2021 Jan 11;33(4):e2003084. Epub 2020 Dec 11.

Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 117583, Singapore.

Janus metamaterials, metasurfaces, and monolayers have received intensive attention in nanophotonics and 2D materials. Their core concept is to introduce asymmetry along the wave propagation direction, by stacking different materials or layers of meta-atoms, or breaking out-of-plane mirror asymmetry with external biases. Nevertheless, it has been hitherto elusive to realize a diffusive Janus metadevice, since scalar diffusion systems such as heat conduction normally operate in the absence of polarization control, spin manipulation, or electric-field stimuli, which all are widely used in achieving optical Janus devices. Read More

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January 2021

Destabilization mechanism of (W+W)/O reverse Janus emulsions.

J Colloid Interface Sci 2021 Mar 20;585:205-216. Epub 2020 Nov 20.

School of Chemistry and Chemical Engineering, Yangzhou University, Jiangsu Province, China. Electronic address:

Hypothesis: Reverse Janus emulsion, with droplets composed by "two rooms" of water phases, is a novel multiple emulsion attributed to excellent integration capability and biocompatibility. However, significant instability compared with normal Janus emulsions renders the stability issue of great importance. Moreover, the ultra-low aqueous-aqueous inner interfacial tension, the anisotropic nature of the droplets with distinct lobe composition, and the random orientation in the continuous phase endow the complicated and various demulsification mechanisms. Read More

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Electric polarization related Dirac half-metallicity in Mn-trihalide Janus monolayers.

Phys Chem Chem Phys 2020 Nov;22(45):26468-26477

Tianjin Key Laboratory of Film Electronic & Communicate Devices, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin 300384, China.

A two-dimensional Dirac half-metal system, in which the 100% spin polarization and massless Dirac fermions can coexist, will show more advantages on the efficient spin injection and high spin mobility in spintronic devices. Moreover, it is attractive to achieve out-of-plane electric polarization in addition to the Dirac half-metal behavior, because this will open a new horizon in the field of multifunctional devices. In this work, a systematic study is made of Janus monolayers of Mn2X3Y3 (X, Y = Cl, Br and I, X ≠ Y) with asymmetric out-of-plane structural configurations, based on first-principles calculations. Read More

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November 2020

Assembly and mechanical response of amphiphilic Janus nanosheets at oil-water interfaces.

J Colloid Interface Sci 2021 Feb 17;583:214-221. Epub 2020 Sep 17.

Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, People's Republic of China; School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China. Electronic address:

Hypothesis: Amphiphilic Janus nanosheets are plate-shaped, with one hydrophilic and one hydrophobic side; they are expected to assemble at oil-water interfaces. The assembled Janus nanosheets layers at the oil-water interface will exhibit a unique mechanical response under the vertical pressure of a probe.

Experiments: The interfacial behaviors of amphiphilic Janus nanosheets and the morphology of the assembled particle film at an oil-water interface were observed. Read More

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February 2021

Driving the polar spin reorientation transition of ultrathin ferromagnets with antiferromagnetic-ferromagnetic phase transition of nearby FeRh alloy film.

Sci Rep 2020 Sep 10;10(1):14901. Epub 2020 Sep 10.

Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059, Kraków, Poland.

We show that in-plane to out-of-plane magnetization switching of a ferromagnetic layer can be driven by antiferromagnetic-ferromagnetic phase transition in a nearby FeRh system. For FeRh/Au/FeAu trilayers, the impact of the magnetic phase transition of FeRh onto the perpendicular magnetization of monoatomic FeAu superlattices is transferred across the Au spacer layer via interlayer magnetic coupling. The polar spin reorientation process of the FeAu spins driven by the magnetic phase transition in the FeRh reveals its major features; namely it is reversible and displays hysteresis. Read More

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September 2020

Bioinspired Free-Standing One-Dimensional Photonic Crystals with Janus Wettability for Water Quality Monitoring.

ACS Appl Mater Interfaces 2020 Sep 25;12(36):40979-40984. Epub 2020 Aug 25.

School of Physics and Technology, Nanjing Normal University, Nanjing 210000, People's Republic of China.

Materials with specific wettability properties have aroused enormous interest and research for their broad application prospects in chemical reaction, medical diagnosis, biological analysis, etc. Here, inspired by the unique Janus wettability of lotus leaf and Bragg stacks of beetles, we present a free-standing film with Janus wettability and tunable structural color for water quality monitoring. This film is constructed by using a flexible polymer polyurethane (PU) to pack poly(-isopropyl acrylamide-bis-acrylamide-acrylic acid) (P(NiPAAm-bis-AA))/TiO one-dimensional photonic crystals (1DPCs) into a free-standing state with Janus wettability and tunable structural color. Read More

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September 2020

Optical and Magnetic Properties of Ag-Ni Bimetallic Nanoparticles Assembled via Pulsed Laser-Induced Dewetting.

ACS Omega 2020 Aug 21;5(30):19285-19292. Epub 2020 Jul 21.

Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States.

Pulsed laser-induced dewetting (PLiD) of AgNi thin films results in phase-separated bimetallic nanoparticles with size distributions that depend on the initial thin film thickness. Co-sputtering of Ag and Ni is used to generate the as-deposited (AD) nanogranular supersaturated thin films. The magnetic and optical properties of the AD thin films and PLiD nanoparticles are characterized using a vibrating sample magnetometer, optical absorption spectroscopy, and electron energy loss spectroscopy (EELS). Read More

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An Aligned Patterned Biomimetic Elastic Membrane Has a Potential as Vascular Tissue Engineering Material.

Front Bioeng Biotechnol 2020 30;8:704. Epub 2020 Jun 30.

Central Laboratory, Southern Medical University affiliated Fengxian Hospital, Shanghai, China.

Cardiovascular disease is the leading cause of death worldwide, with an annual mortality incidence predicted to rise to 23.3 million worldwide by 2030. Synthetic vascular grafts as an alternative to autologous vessels have shown satisfactory long-term results for replacement of large- and medium-diameter arteries, but have poor patency rates when applied to small-diameter vessels. Read More

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Coupled Heat and Mass Transport in Liquid Films that Contain Thermophoretically Active Particles.

J Phys Chem B 2020 Jul 8;124(29):6398-6403. Epub 2020 Jul 8.

Boise State University, Boise, Idaho 83725, United States.

We consider the spontaneous redistribution of thermophoretically active particles suspended in a thin film of liquid, made to absorb energy and transmit it in the form of heat to the surrounding medium. When the opposing boundaries to the thin dimension are maintained at a constant temperature, a nonuniform temperature profile is formed across the film because of differential heat dissipation, which is maximized at the boundaries. Thermophobic particles move and concentrate at the opposing (cooler) boundaries, whereas thermophilic particles concentrate within a layer midway between the boundaries. Read More

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Plasmonic Janus Microspheres Created from Pickering Emulsion Drops.

Adv Mater 2020 Jul 14;32(26):e2001384. Epub 2020 May 14.

Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, South Korea.

Metal nanostructures have been created in a film format to develop unique plasmonic properties. Here, well-defined metal nanostructures are designed on the surface of microspheres to provide plasmonic microgranules. As conventional techniques are inadequate for nanofabrication on spherical surfaces, photocurable emulsion drops with a regular array of silica particles are employed at the interface to create periodic nanostructures. Read More

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Airflow Enhanced Solar Evaporation Based on Janus Graphene Membranes with Stable Interfacial Floatability.

ACS Appl Mater Interfaces 2020 Jun 22;12(22):25435-25443. Epub 2020 May 22.

State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Haidian, Beijing 00084, China.

Solar interfacial evaporation has been recognized as a versatile energy conversion protocol for cutting-edge applications such as water treatment and power generation (e.g., hydro voltaic effect). Read More

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Unidirectional Transport and Effective Collection of Underwater CO Bubbles Utilizing Ultrafast-Laser-Ablated Janus Foam.

ACS Appl Mater Interfaces 2020 Apr 2;12(15):18110-18115. Epub 2020 Apr 2.

CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China.

Manipulating gas bubbles in aqueous ambient is of great importance for applications in water treatment, gas collection, and matter transport. Here, a kind of Janus foam is designed and fabricated by one-step ultrafast laser ablation of one side of the copper film, which is treated to be superhydrophobic. Janus foam exhibits not only the capability of unidirectional transport of underwater bubbles but also gas collection with favorable efficiency up to ∼15 mL cm min. Read More

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Buoyancy-Free Janus Microcylinders as Mobile Microelectrode Arrays for Continuous Microfluidic Biomolecule Collection within a Wide Frequency Range: A Numerical Simulation Study.

Micromachines (Basel) 2020 Mar 10;11(3). Epub 2020 Mar 10.

School of Electronics and Control Engineering, Chang'an University, Middle-Section of Nan'er Huan Road, Xi'an 710064, China.

We numerically study herein the AC electrokinetic motion of Janus mobile microelectrode (ME) arrays in electrolyte solution in a wide field frequency, which holds great potential for biomedical applications. A fully coupled physical model, which incorporates the fluid-structure interaction under the synergy of induced-charge electroosmotic (ICEO) slipping and interfacial Maxwell stress, is developed for this purpose. A freely suspended Janus cylinder free from buoyancy, whose main body is made of polystyrene, while half of the particle surface is coated with a thin conducting film of negligible thickness, will react actively on application of an AC signal. Read More

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Reconfigurable Liquids Stabilized by DNA Surfactants.

ACS Appl Mater Interfaces 2020 Mar 4;12(11):13551-13557. Epub 2020 Mar 4.

Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

Polyelectrolyte microcapsules can be produced either by the layer-by-layer assembly technique or the formation of polyelectrolyte complexes at the liquid-liquid interface. Here, we describe the design and construction of DNA microcapsules using the cooperative assembly of DNA and amine-functionalized polyhedral oligomeric silsesquioxane (POSS-NH) at the oil-water interface. "Janus-like" DNA surfactants (DNASs) assemble in situ at the interface, forming an elastic film. Read More

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A centrifugal microfluidic emulsifier integrated with oil storage structures for robust digital LAMP.

Biomed Microdevices 2020 02 15;22(1):18. Epub 2020 Feb 15.

State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China.

Centrifugal droplet-based microfluidic devices have been applied to biomedical analysis and diagnostics recently. However, in centrifugal droplet-based microfluidic devices, droplets are tightly packed (i.e. Read More

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February 2020

Free-Standing 2D Janus Gold Nanoparticles Monolayer Film with Tunable Bifacial Morphologies via the Asymmetric Growth at Air-Liquid Interface.

Langmuir 2020 Jan 14;36(1):250-256. Epub 2019 Nov 14.

Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies , Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences , Ningbo 315201 , China.

Large scaled two-dimensional free-standing monolayer films of gold nanoparticles show distinctive optical, electrical, and chem-physical propertie making them a new class of advanced plasmonic materials differing from bulk materials and individual nanoparticles in solution. The conventional 2D gold nanoparticle films usually possess symmetric structures and identical properties of gold nanoparticles on both sides. Herein, we developed an easy and efficient approach to construct a new type of free-standing 2D gold nanoparticle monolayer film with asymmetric gold nanoparticle structures and functions, called a 2D Janus gold nanoparticle film. Read More

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January 2020