11 results match your criteria hollow semi-hollow

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Ancient Oil as a Source of Carbonaceous Matter in 1.88-Billion-Year-Old Gunflint Stromatolites and Microfossils.

Astrobiology 2021 Mar 8. Epub 2021 Mar 8.

Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA.

The 1.88-billion-year-old Gunflint carbonaceous microfossils are renowned for their exceptional morphological and chemical preservation, attributed to early and rapid entombment in amorphous silica. The carbonaceous matter lining and partly filling filamentous and spherical structures is interpreted to be indigenous, representing thermally altered relicts of cellular material ( kerogen). Read More

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Cross-sectional study of Leptospira spp. in commercial pig farms in the state of Goiás, Brazil.

Trop Anim Health Prod 2020 Nov 19;53(1):13. Epub 2020 Nov 19.

Department of Veterinary Clinic and Surgery, School of Agricultural and Veterinarian Sciences, São Paulo State University (UNESP), Jaboticabal, São Paulo, Brazil.

Leptospirosis is an infectious, contagious disease highly important to the world pig industry, which causes reproductive loss in breeding herds. Endemic infections in a herd may produce little evidence of clinical disease despite resulting in economic losses. However, some epidemiological features of leptospirosis in midwestern Brazil, such as risk factors and prevalence of the disease, remain unclear. Read More

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November 2020

Controlled growth and optical response of a semi-hollow plasmonic nanocavity and ultrathin sulfide nanosheets on Au/Ag platelets.

Nanoscale 2018 Jan;10(3):1279-1285

Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China.

Herein, we report a strategy to construct a semi-hollow plasmonic nanocavity and grow ultrathin sulfide nanosheets inside. The competition and cooperation of Au deposition with Ag etching based on flat Ag nanoplates are proposed. For the establishment of the semi-hollow nanocavity, Au shells are grown on Ag nanoplates, which serve as a stable frame, followed by partial etching of the Ag nanoplates. Read More

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January 2018

Polycrystalline soft carbon semi-hollow microrods as anode for advanced K-ion full batteries.

Nanoscale 2017 Nov;9(46):18216-18222

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.

Soft carbon, which possesses the advantages of low cost and considerable potassium storage capacity, has been widely studied as an anode in K-ion batteries (KIBs). Herein, we constructed a novel polycrystalline semi-hollow microrods-structured soft carbon as an anode in KIBs, which exhibited both high capacity and excellent cycling stability. Read More

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November 2017

Facile synthesis and shape evolution of well-defined phosphotungstic acid potassium nanocrystals as a highly efficient visible-light-driven photocatalyst.

Nanoscale 2017 Jan 1;9(1):216-222. Epub 2016 Dec 1.

College of Chemistry and Chemical Engineering, Yangzhou University Yangzhou, Jiangsu 225002, China.

Uniform and hollow rhombic dodecahedral, rhombic dodecahedral, spherical, and semi-hollow KPWO·nHO nanocrystals are fabricated without any surfactants or templating agents in mild hydrothermal conditions. The shape evolution and growth of these crystals are studied by changing different reaction parameters, such as the reagent, time and temperature. It is found that the temperature and time have significant effects on the possible growth processes of these nanostructures. Read More

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January 2017

Physical deposition improved SERS stability of morphology controlled periodic micro/nanostructured arrays based on colloidal templates.

Small 2015 Feb 30;11(7):844-53. Epub 2014 Oct 30.

Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, Anhui, China; Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.

An effective and inexpensive method is developed to fabricate periodic arrays by sacrificial colloidal monolayer template route by chemical deposition and further physical deposition. By a colloidal template induced precursor solution dipping strategy, different periodic arrays of semi-hollow sphere array, inverse opal with monolayer pore arrays and hole arrays are obtained under different conditions. After magnetron sputtering deposition, their morphologies are changed to novel micro/nanostructured arrays of honeycomb-shaped arrays, hollow cavity arrays, and regular network arrays due to multiple direction deposition of sputtering deposition and shadow effect. Read More

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February 2015

Magneto-plasmonic nanoparticles as theranostic platforms for magnetic resonance imaging, drug delivery and NIR hyperthermia applications.

Nanoscale 2014 Aug;6(15):9230-40

Department of Chemical Engineering, Aragon Institute of Nanoscience (INA), University of Zaragoza, Campus Río Ebro-Edificio I+D, C/Poeta Mariano Esquillor S/N, 50018-Zaragoza, Spain.

PEGylated magneto-plasmonic nanoparticles with a hollow or semi-hollow interior have been successfully synthesized and their physico-chemical characteristics have been investigated. The hollow interior space can be used to store drugs or other molecules of interest whereas magnetic characterization shows their potential as contrast agents in magnetic resonance imaging (MRI) applications. In addition, their plasmonic characteristics in the near infrared (NIR) region make them efficient in photothermal applications producing high temperature gradients after short irradiation times. Read More

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Thermosensitive PNIPAM semi-hollow spheres for controlled drug release.

J Mater Chem B 2013 Jul 6;1(28):3464-3469. Epub 2013 Jun 6.

Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing 100190, P. R. China.

Thermosensitive poly(N-isopropylacrylamide) (PNIPAM) semi-hollow spheres consisting of low density cores, dense shells and separated cavities between cores and shells were prepared via two-step precipitation polymerization. The self-cross-linked poly(N-isopropylacrylamide-co-methacrylic acid) (PNIPAM-co-PMAA) gels with low solid density were prepared in the first precipitation polymerization and served as the templates on which dense PNIPAM shells cross-linked by N,N'-methylenebis(acrylamide) (BMA) were formed in the second precipitation polymerization. The shell thickness of the semi-hollow spheres could be controlled via adjusting the feeding core/shell mass ratios. Read More

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One-pot synthesis of ultra-light nickel nanofoams composed of nanowires and their transformation into various functional nanofoams.

Small 2012 Nov 3;8(22):3432-7. Epub 2012 Sep 3.

School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457, Singapore; Webpage: http://www.ntu.edu.sg/home/xwlou/

Ultra-light Ni nanofoams composed of nanowires have been synthesized on a large scale by a facile reflux approach. From the Ni nanofoam, many other functional nanofoams, composed of semi-hollow NiO nanowires, multi-generation Ni nanowires, and noble metal nanotubes, can be easily derived for many important applications. As an example, the promising application of the NiO nanofoam in lithium-ion batteries is demonstrated. Read More

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November 2012

Bionic electrospun ultrafine fibrous poly(L-lactic acid) scaffolds with a multi-scale structure.

Biomed Mater 2009 Jun 14;4(3):035004. Epub 2009 May 14.

State Key Lab for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, 201620, People's Republic of China.

Poly(L-lactic acid) (PLLA) tissue engineering scaffolds with porous inner structures of individual fibers and controllable architectures were successfully fabricated from the homogeneous polymer-solvent-nonsolvent system (PLLA, CH(2)Cl(2) and DMF) by a single capillary electrospinning with certain conductive patterned templates as fiber collectors. PLLA was dissolved in dimethylformamide (DMF) and methylene chloride (CH(2)Cl(2)) mixed solvent with different ratios. Semi-hollow fiber with porous inner structure and compact shell wall was formed by controlling the content of DMF in the mixed solvents. Read More

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Metastable gamma-MnS hierarchical architectures: synthesis, characterization, and growth mechanism.

J Phys Chem B 2006 Apr;110(16):8284-8

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and Graduate School of Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.

Preparation of shape-controlled metastable gamma-MnS semiconductor nanocrystals has been achieved on a large scale through a simple solvothermal method in the presence of PVP. The key strategy is the use of sulfur powder as sulfur source in ethylene glycol (EG) solvent that also acted as a weak reducing agent. Reaction parameters such as reaction time and temperature are found to be important in controlling various hierarchical architectures, such as homogeneous semi-hollow core-shell, hollow nanospheres, and nanowires. Read More

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