288 results match your criteria oxide nanoflowers

A Novel Nonenzymatic Ascorbic Acid Electrochemical Sensor Based on Gold Nanoparticals-Chicken Egg White-Copper Phosphate-Graphene Oxide Hybrid Nanoflowers.

Nanotechnology 2021 May 5. Epub 2021 May 5.

Shaanxi University of Science and Technology Xi'an Campus, Xi'an, Shaanxi, CHINA.

Au-CEW-Cu3(PO4)2-GO nanoflowers (HNFs), which were assembled of gold nanoparticals (Au NPs), chicken egg white (CEW), copper phosphate (Cu3(PO4)2) and graphene oxide (GO) together to form a flower-like organic/inorganic hybrid nanocomposite, were synthesized through a simple and gentle one-pot co-precipitation method. The prepared samples were well characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive X-ray spectrometer (EDX), X-ray diffraction (XRD) and Raman spectrometer. The prepared Au-CEW-Cu3(PO4)2-GO HNFs was used to modify glassy carbon electrode (GCE) to fabricate an electrochemical sensor for detection of ascorbic acid (AA). Read More

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Emulsion-template synthesis of mesoporous nickel oxide nanoflowers composed of crossed nanosheets for effective nitrogen reduction.

Dalton Trans 2021 May;50(17):5835-5844

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

A novel emulsion-template synthesis approach was developed for the preparation of nickel oxide nanoflowers (NiO-NFs) composed of crossed mesoporous nanosheets. The interface assembly process was regulated by tuning the dosage of NH3·H2O, resulting in the tunability of thickness and size of mesoporous NiO nanosheets. The as-prepared NiO-NFs were characterized by field emission scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller analysis, X-ray diffraction, and X-ray photoelectron spectroscopy (XPS). Read More

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Photocatalytic Behaviour of Zinc Oxide Nanostructures on Surface Activation of Polymeric Fibres.

Polymers (Basel) 2021 Apr 10;13(8). Epub 2021 Apr 10.

Department of Material Science, Faculty of Mechanical Engineering, Studentská 1402/2, 461 17 Liberec 1, Technical University of Liberec, 46117 Liberec, Czech Republic.

Zinc oxide (ZnO) in various nano forms (nanoparticles, nanorods, nanosheets, nanowires and nanoflowers) has received remarkable attention worldwide for its functional diversity in different fields i.e., paints, cosmetics, coatings, rubber and composites. Read More

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A Tumor Microenvironment Responsive Nanotheranostics Agent for Magnetic Resonance Imaging and Synergistic Photodynamic Therapy/Photothermal Therapy of Liver Cancer.

Front Chem 2021 7;9:650899. Epub 2021 Apr 7.

Department of Hepatobiliary and Pancreatic Surgery, The Second Hospital of Jilin University, Changchun, Jilin, China.

Surgery is the main treatment for liver cancer in clinic owing to its low sensitivity to chemotherapy and radiotherapy, but this results in high mortality, recurrence, and metastasis rates. It is a feasible strategy to construct tumor microenvironments activated by nanotheranostics agents for the diagnosis and therapy of liver cancer. This study reports on a nanotheranostic agent (MONs@PDA-ICG) with manganese oxide nanoflowers (MONs) as core and polydopamine (PDA) as shell loading, with ICG as a photosensitizer and photothermal agent. Read More

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Construction of hierarchical sea urchin-like manganese substituted nickel cobaltite@tricobalt tetraoxide core-shell microspheres on nickel foam as binder-free electrodes for high performance supercapacitors.

J Colloid Interface Sci 2021 Aug 26;596:89-99. Epub 2021 Mar 26.

School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China; State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China. Electronic address:

Construction of binder-free electrodes with hierarchical core-shell nanostructures is considered to be an effective route to promote the electrochemical performance of supercapacitors. In this work, the porous NiMnCoO nanoflowers anchored on nickel foam are utilized as framework for further growing CoO nanowires, resulting in the hierarchical sea urchin-like NiMnCoO@CoO core-shell microspheres on nickel foam. Owing to the advantages brought by unique porous architecture and synergistic effect of the multi-component composites, the as-prepared electrode exhibits a high specific capacitance (931 F/g at 1 A/g), excellent rate performance (77% capacitance retention at 20 A/g) and outstanding cycle stability (92% retention over 5000 cycles at 5 A/g). Read More

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P-Type Cobalt Phosphide Composites (CoP-CoP) Decorated on Titanium Oxide for Enhanced Noble-Metal-Free Photocatalytic H Evolution Activity.

Langmuir 2021 Mar 11;37(11):3321-3330. Epub 2021 Mar 11.

School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, People's Republic of China.

Nowadays, transition-metal phosphides have been reported to function well in photocatalytic water splitting and possess great potential to substitute traditional noble-metal cocatalysts in the future. Herein, p-type cobalt phosphide (CoP-CoP) nanomaterials were synthesized by phosphating the solvothermally prepared Co(OH) nanoflowers at a low temperature (300 °C). Then, we combined the phosphides with commercial TiO through facile mechanical mixing to fabricate a useful noble-metal-free photocatalyst. Read More

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Therapeutic angiogenesis using zinc oxide nanoflowers for the treatment of hind limb ischemia in rat model.

Biomed Mater 2021 Mar 3. Epub 2021 Mar 3.

Biomaterials Group, LST Division, CSIR-Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad 500007, AP, Hyderabad, Andhra Pradesh, 500007, INDIA.

Critical limb ischemia (CLI) is considered as a severe type of peripheral artery diseases (PADs) which occurs due to the inadequate supply of blood to the limb extremities. CLI patients often suffer from extreme cramping pain, impaired wound healing, immobility, cardiovascular complications, amputation of the affected limb and even death. The conventional therapy for the treatment of CLI includes surgical revascularization as well as restoring angiogenesis using growth factor therapy. Read More

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An enhanced electrochemical performance of in milk, pigeon meat and eggs samples using se nanorods capped with CoO nanoflowers decorated on graphene oxide.

Colloids Surf B Biointerfaces 2021 Apr 19;200:111577. Epub 2021 Jan 19.

Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia. Electronic address:

In this work, we report a novel preparation of selenium nanorods (Se) doped cobalt oxide (CoO) nanoflowers encapsulated with graphene oxide (GO) nanocomposite (NC). Se nanorods were successfully decorated on CoO nanoflowers and an increase in electrical conductivity was observed in Se-CoO@GO-NC. The as-prepared Se-CoO@GO-NC was utilized as an effective nanocomposite for the electrochemical detection of dimetridazole (DMZ) for the first time in the field of electrochemical sensors. Read More

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Self-Assembled DNA Nanoflowers Triggered by a DNA Walker for Highly Sensitive Electrochemical Detection of .

ACS Appl Mater Interfaces 2021 Feb 20;13(4):4905-4914. Epub 2021 Jan 20.

The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.

With the development of DNA nanotechnology, DNA has been widely used to construct a variety of nanomachines. Among them, a DNA walker is a unique nanomachine that can move continuously along a specific orbit to fulfill diverse functions. In this paper, a dual signal amplification electrochemical biosensor based on a DNA walker and DNA nanoflowers is constructed for high sensitivity detection of (). Read More

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February 2021

Photothermal effect and cytotoxicity of CuS nanoflowers deposited over folic acid conjugated nanographene oxide.

J Mater Chem B 2021 02;9(7):1792-1803

Cooperative Agricultural Research Center, Prairie View A&M University, Prairie View, TX 77446, USA.

Herein, we present the rational synthesis of a multimode photothermal agent, NGO-FA-CuS, for the advancement of photothermal therapy of cancer. The hierarchical architecture created in NGO-FA-CuS was attained by the covalent conjugation of folic acid (FA) to nanographene oxide (NGO) through amide bonding, followed by the hydrothermal deposition of CuS nanoflowers. In this approach, instead of mere mixing or deposition, FA was covalently bonded to NGO, which helped in retaining their intrinsic properties after binding and allowed to access them in the resulting hybrid nanostructure. Read More

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February 2021

Spatiotemporally Resolved Heat Dissipation in 3D Patterned Magnetically Responsive Hydrogels.

Small 2021 Feb 28;17(5):e2004452. Epub 2020 Dec 28.

School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.

Multifunctional nanocomposites that exhibit well-defined physical properties and encode spatiotemporally controlled responses are emerging as components for advanced responsive systems, for example, in soft robotics or drug delivery. Here an example of such a system, based on simple magnetic hydrogels composed of iron oxide magnetic nanoflowers and Pluronic F127 that generates heat upon alternating magnetic field irradiation is described. Rules for heat-induction in bulk hydrogels and the heat-dependence on particle concentration, gel volume, and gel exposed surface area are established, and the dependence on external environmental conditions in "closed" as compared to "open" (cell culture) system, with controllable heat jumps, of ∆T 0-12°C, achieved within ≤10 min and maintained described. Read More

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February 2021

Self-assembled chromogen-loaded polymeric cocoon for respiratory virus detection.

Nanoscale 2021 Jan 22;13(1):388-396. Epub 2020 Dec 22.

Department of Bioscience, Graduate School of Science and Technology, Shizuoka University, 836 Ohya Suruga-ku, Shizuoka 422-8529, Japan.

Inspired by the self-assembly approach, in this work, the chromogen, 3,3',5,5'-tetramethylbenzidine (TMB), was successfully co-precipitated in aqueous solution to form collective nanoparticles (NPs) of signal molecules (TMB-NPs). Utilizing poly(lactide-co-glycolide) (PLGA) in the molecular delivery approach, the formed emulsion nanovesicle (TMB-NPs@PLGA) exhibits an enrichment of the collective signal molecules in a single antibody-antigen conjugation. A specific antibody-conjugated TMB-NPs@PLGA forms an immunocomplex sandwich structure upon the addition of influenza virus (IV)/A. Read More

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January 2021

Bioinspired synthesis of zinc oxide nano-flowers: A surface enhanced antibacterial and harvesting efficiency.

Mater Sci Eng C Mater Biol Appl 2021 Feb 23;119:111280. Epub 2020 Jul 23.

College of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China. Electronic address:

Despite of broad range application, the cost effective, highly stable and reproduceable synthesis of ZnO is needed, especially which can make it biosafe as well. Here, a unique bioinspired synthesis of ZnO nanoflowers (NFs) has been introduced using Withania coagulans extract as reducing agent. Different molar concentrations were assessed to counter the effect of structural, morphological, antibacterial activity and high efficiency of algae harvesting. Read More

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February 2021

Ultrasensitive detection of cytotoxic food preservative tert-butylhydroquinone using 3D cupric oxide nanoflowers embedded functionalized carbon nanotubes.

J Hazard Mater 2021 Mar 7;406:124792. Epub 2020 Dec 7.

Department of Chemical Engineering and Materials Science, Amrita School of Engineering, Coimbatore, Amrita Vishwa Vidyapeetham, Tamil Nadu, India.

Accurate detection of cytotoxic food preservative tert-butylhydroquinone (TBHQ) has significant importance in maintaining food quality and safety. TBHQ is a chronic hazard to aquatic life and its use in applications involving direct human exposure and frequent release to environment makes its quantification critical to maintain safety. Hence, we report development of a sensitive electrochemical sensor for TBHQ determination at nanomolar level in commonly used edible oils and water sample. Read More

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An Astragalus membranaceus based eco-friendly biomimetic synthesis approach of ZnO nanoflowers with an excellent antibacterial, antioxidant and electrochemical sensing effect.

Mater Sci Eng C Mater Biol Appl 2021 Jan 22;118:111432. Epub 2020 Aug 22.

College of Electronics and Information Engineering, Shenzhen University, Guangdong Province 518000, China. Electronic address:

Nowadays featuring outstanding eco-friendliness, the phytochemical fabrication method of nanostructures is very popular. Here, we propose to utilize the Astragalus membranaceus extract as the reducing and capping agent to stabilize the metal and to avoid the aggregations of nanoparticles during ZnO nanoflowers synthesis procedure. As a result, the whole fabrication procedure was highly efficient and cost-effective without requiring a special environment of high pressure or elevated temperature and without chemical hazards used or produced. Read More

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January 2021

Construction of cerium oxide nanoparticles immobilized on the surface of zinc vanadate nanoflowers for accelerated photocatalytic degradation of tetracycline under visible light irradiation.

J Colloid Interface Sci 2021 Apr 13;587:831-844. Epub 2020 Nov 13.

School of Chemistry and Chemical Engineering, Research Center for Clean Energy Materials Chemical Engineering Technology of Guangdong, Key Laboratory of Clean Energy Materials Chemistry of Guangdong Higher Education Institutes, Lingnan Normal University, Zhanjiang 524048, China. Electronic address:

Construction of Z-scheme heterojunction has been deemed to be an effective and promising approach to boost the photocatalytic activity on account of accelerating the separation efficiency of the photogenerated carriers and maintaining the strong redox ability. Herein, an attractive CeO/ZnVO Z-scheme heterojunction photocatalyst was rationally constructed by zero-dimensional (0D) CeO nanoparticles immobilized on the surface of three-dimensional (3D) ZnVO nanoflowers using a simple mixing method, and applied to the photocatalytic degradation of tetracycline (TC) under visible light irradiation. As expected, it was observed that the prepared CeO/ZnVO hybrid illustrated significantly boosted the photocatalytic activity for the elimination of TC compared to pure ZnVO. Read More

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Fluorometric Detection of Thiamine Based on Hemoglobin-Cu(PO) Nanoflowers (NFs) with Peroxidase Mimetic Activity.

Sensors (Basel) 2020 Nov 7;20(21). Epub 2020 Nov 7.

School of Public Health, Jilin University, Changchun 130021, Jilin, China.

Component analysis plays an important role in food production, pharmaceutics and agriculture. Nanozymes have attracted wide attention in analytical applications for their enzyme-like properties. In this work, a fluorometric method is described for the determination of thiamine (TH) (vitamin B) based on hemoglobin-Cu(PO) nanoflowers (Hb-Cu(PO) NFs) with peroxidase-like properties. Read More

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November 2020

Vortex Fluidic-Mediated Fabrication of Fast Gelated Silica Hydrogels with Embedded Laccase Nanoflowers for Real-Time Biosensing under Flow.

ACS Appl Mater Interfaces 2020 Nov 5;12(46):51999-52007. Epub 2020 Nov 5.

Flinders Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Adelaide, South Australia 5042, Australia.

The fabrication of hybrid protein-Cu(PO) nanoflowers (NFs) via an intermediate toroidal structure is dramatically accelerated under shear using a vortex fluidic device (VFD), which possesses a rapidly rotating angled tube. As-prepared laccase NFs (LNFs) exhibit ≈1.8-fold increase in catalytic activity compared to free laccase under diffusion control, which is further enhanced by ≈ 2. Read More

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November 2020

Armoring bio-catalysis via structural and functional coordination between nanostructured materials and lipases for tailored applications.

Int J Biol Macromol 2021 Jan 2;166:818-838. Epub 2020 Nov 2.

Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Mexico. Electronic address:

Nanostructured materials represent an interesting and novel class of support matrices for the immobilization of different enzymes. Owing to the high surface area, robust mechanical stability, outstanding optical, thermal, and electrical properties, nanomaterials have been rightly perceived as desired immobilization matrices for lipases immobilization with a wide array of biotechnological applications such as dairy, food technology, fine chemical, pharmaceutical, detergent, and oleochemical industries. Lipases immobilized on nanomaterials have demonstrated superior attributes than free counterparts, such as aggrandized pH and thermal stability, robustness, long-term stability, and the possibility of reuse and recycling in several times. Read More

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January 2021

Photocatalytic degradation of nevirapine with a heterostructure of few-layer black phosphorus coupled with niobium (V) oxide nanoflowers (FL-BP@NbO).

Chemosphere 2020 Dec 29;261:128159. Epub 2020 Aug 29.

Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa. Electronic address:

The degradation and removal of antiviral drugs in water has emerged remains a major challenge. This work presents, the photodegradation of nevirapine (NVP) with a novel p-n heterostructure of FL-BP@NbO nanoparticles synthesized via hydrothermal method. Several characterization techniques revealed a successful formation of the heterostructure with well aligned band positions that promoted excellent separation of charge carriers. Read More

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December 2020

Zinc oxide nanoparticles: future therapy for cerebral ischemia.

Nanomedicine (Lond) 2020 12 20;15(28):2729-2732. Epub 2020 Oct 20.

Department of Applied Biology, CSIR Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad, Telangana 500007, India.

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December 2020

Photocatalytic hydrogen production from dye contaminated water and electrochemical supercapacitors using carbon nanohorns and TiO nanoflower heterogeneous catalysts.

J Environ Manage 2021 Jan 15;277:111433. Epub 2020 Oct 15.

Soniya College of Pharmacy, Dharwad, Karnataka, 580 002, India. Electronic address:

In this research, efficient and novel catalysts based on hierarchical carbon nanohorns-titanium nanoflowers have been prepared by one-pot solvothermal process. Hydrogen generation from dye-contaminated water and dye degradation along with electrochemical supercapacitance performance have been investigated using the synthesized hierarchical catalyst to produce 4500 μmol g h of hydrogen from the photocatalytically generated aqueous methylene blue and methyl orange dyes, which were degraded up to 90% under natural solar light irradiation. These results offer a new path to generate hydrogen from the aqueous dyes. Read More

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January 2021

Core-Shell Nanofibers of Polyvinylidene Fluoride-based Nanocomposites as Piezoelectric Nanogenerators.

Polymers (Basel) 2020 Oct 13;12(10). Epub 2020 Oct 13.

Materials Science & Technology Program (MATS), College of Arts & Sciences, Qatar University, Doha 2713, Qatar.

Flexible piezoelectric nanogenerators (PENG) are widely applied to harvest sustainable energy from multiple energy sources. The rational and simple design of PENG have great potential in soft electronics. Here we design a highly flexible PENG using the polyvinylidene fluoride (PVDF) and its copolymer, polyvinylidene hexafluoropropylene (PVDF-HFP) with two nanoarchitectures of semiconducting metal oxides, TiO and ZnO. Read More

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October 2020

Etched multicore fiber sensor using copper oxide and gold nanoparticles decorated graphene oxide structure for cancer cells detection.

Biosens Bioelectron 2020 Nov 26;168:112557. Epub 2020 Aug 26.

Department of Electronics and Communication Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, Uttarakhand, India.

A compact, portable, label-free, and ultra-sensitive sensor is proposed to detect cancerous cells based on Multi-Core Fiber (MCF) comprising of seven cores arranged in a hexagonal shape spliced with Single-Mode Fiber (SMF). Here, cytosensing based on fiber optic Localized Surface Plasmon Resonance (LSPR) is used for the efficient detection of different types of cancer cells. The proposed sensor structure is etched in a controlled manner to increase the evanescent wave (EWs) and coupling of modes between the cores of MCF. Read More

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November 2020

NiFe-Layered Double Hydroxide Synchronously Activated by Heterojunctions and Vacancies for the Oxygen Evolution Reaction.

ACS Appl Mater Interfaces 2020 Sep 11;12(38):42850-42858. Epub 2020 Sep 11.

Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Kowloon, 999077 Hong Kong SAR.

The development of earth-abundant transition-metal-based electrocatalysts with bifunctional properties (oxygen evolution reaction (OER) and hydrogen evolution reaction (HER)) is crucial to commercial hydrogen production. In this work, layered double hydroxide (LDH)-zinc oxide (ZnO) heterostructures and oxygen vacancies are constructed synchronously by plasma magnetron sputtering of NiFe-LDH. Using the optimal conditions, ZnO nanoparticles are uniformly distributed on the NiFe-LDH nanoflowers, which are prepared uniformly on the three-dimensional porous Ni foam. Read More

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September 2020

Effect of Tungsten Oxide Nanostructures on Sensitivity and Selectivity of Pollution Gases.

Sensors (Basel) 2020 Aug 26;20(17). Epub 2020 Aug 26.

Department of Physics, University of Puerto Rico, San Juan, PR 00936, USA.

We report on the different surface structures of tungsten oxides which have been synthesized using a simple post-annealing-free hot-filament CVD technique, including 0D nanoparticles (NPs), 1D nanorods (NRs), and 2D nanosheet assemblies of 3D hierarchical nanoflowers (NFs). The surface morphologies, crystalline structures, and material compositions have been characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and Raman spectroscopy, respectively. The sensor performances based on the synthesized samples of various surface morphologies have been investigated, as well as the influences of operating temperature and applied bias. Read More

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Substrate free ultrasonic-assisted hydrothermal growth of ZnO nanoflowers at low temperature.

SN Appl Sci 2020 16;2(8):1386. Epub 2020 Jul 16.

Department of Physics, University of Lucknow, Lucknow, 226007 India.

ZnO nanoflowers (NFs) have been synthesised using a simple cost effective ultrasonic-assisted hydrothermal method at low temperature of 95 °C. Here the NFs consist of petal-like arrangement of several hexagonal-shaped nanorods, the length and diameter of which lie in a range of 100-150 nm and 30-70 nm, respectively. ZnO NFs possess hexagonal wurtzite phase, high crystallinity and strong absorption in the UV region. Read More

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Bioelectrocatalysis of Hemoglobin on Electrodeposited Ag Nanoflowers toward HO Detection.

Nanomaterials (Basel) 2020 Aug 19;10(9). Epub 2020 Aug 19.

Department of Electronics Engineering, Gachon University, Seongnam-si, Gyeonggi-do 13210, Korea.

Hydrogen peroxide (HO) is a partially reduced metabolite of oxygen that exerts a diverse array of physiological and pathological activities in living organisms. Therefore, the accurate quantitative determination of HO is crucial in clinical diagnostics, the food industry, and environmental monitoring. Herein we report the electrosynthesis of silver nanoflowers (AgNFs) on indium tin oxide (ITO) electrodes for direct electron transfer of hemoglobin (Hb) toward the selective quantification of HO. Read More

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Synergistic antibacterial activity of streptomycin sulfate loaded PEG-MoS/rGO nanoflakes assisted with near-infrared.

Mater Sci Eng C Mater Biol Appl 2020 Nov 20;116:111221. Epub 2020 Jun 20.

School of Food and Biological Engineering, Hefei University of Technology, 230009 Hefei, Anhui, PR China; Anhui Institute of Agro-Products Intensive Processing Technology, 230009, Hefei, Anhui, PR China.

Synergistic antibacterial strategies have received growing attention due to their significantly enhanced antibacterial activity. Herein, we demonstrated a synergistic antibacterial strategy based on streptomycin sulfate (SS) loaded polyethylene glycol-MoS/reduced graphene oxide (PEG-MoS/rGO) nanoflakes assisted with near-infrared (NIR). The nanoflakes of PEG-MoS/rGO were ultrasonically exfoliated well from the nanoflowers of PEG-MoS/rGO fabricated by hydrothermal method, which was of antibacterial activity against Staphylococcus aureus and Escherichia coli after loading of SS. Read More

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November 2020