Vacuum-assisted resin transfer molding (VARTM) process was used to fabricate the nanocomposites through integrating carbon nanofiber paper into traditional glass fiber reinforced composites. The carbon nanofiber paper had a porous structure with highly entangled carbon nanofibers and short glass fibers. In this study, the carbon nanofiber paper was employed as an interlayer and surface layer of composite laminates to enhance the damping properties. Experiments conducted using the nanocomposite beam indicated up to 200–700% increase of the damping ratios at higher frequencies. The scanning electron microscopy (SEM) characterization of the carbon nanofiber paper and the nanocomposites was also conducted to investigate the impregnation of carbon nanofiber paper by the resin during the VARTM process and the mechanics of damping augmentation. The study showed a complete penetration of the resin through the carbon nanofiber paper. The connectivities between carbon nanofibers and short glass fibers within the carbon nanofiber paper were responsible for the significant energy dissipation in the nanocomposites during the damping tests.

Jihua Gou

Scott O'Braint

Haichang Gu

Gangbing Song

Damping Augmentation of Nanocomposites Using Carbon Nanofiber Paper

A series of polyurethaneurea (PUU) aqueous dispersions, which werestable at ambient temperature for more than 1 year, were preparedwith C<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi></mml:mi><mml:mrow><mml:mn>36</mml:mn></mml:mrow></mml:msub></mml:math>-dimer-fatty-acid-based polyester polyol, isophoronediisocyanate, dimethylol propionic acid, and ethylenediamine. Theparticle size of all these PUU (DPU) aqueous dispersions(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>&#x003C;</mml:mo><mml:mn>100</mml:mn></mml:math> nm) was less than that of comparable specimens, thatis, poly-(neopentyl glycol adipate) polyester-polyol-based PUU(APU) aqueous dispersions, and the polydispersity index was verynarrow (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>&#x2264;</mml:mo><mml:mn>1.13</mml:mn></mml:math>). The films prepared with the DPU aqueous dispersionsexhibited excellent waterproof performance, such as low amount ofwater absorption (1.3 wt&#37;), and good mechanical properties(hardness and tensile strength), resulting from the stronghydrogen bonding in urea carbonyl groups and the perfect orderedstructure of hard segments compared with those prepared with theAPU aqueous dispersions. The surface hydrophobicity of the filmsprepared with modified DPU aqueous dispersions, which weremodified with a fluorinated polyacrylate emulsion, was excellent,as the water contact angle on the surface of such films rose up to100. The mechanical properties of such modified DPU films werefurther enhanced.

Lin  Jiang

Qiang  Xu

Chun Pu Hu

Preparation and Characterization of Waterborne Polyurethaneurea Composed of Dimer Fatty Acid Polyester Polyol

Photonic crystals (PCs) have many potential applications because
of their ability to control light-wave propagation and because
PC-based waveguides may be integrated into optical circuits. We
propose a novel tunable PC channel drop filter based on nematic
liquid crystals and investigate its properties numerically by
using the finite-difference time-domain (FDTD) method. The refractive indices of liquid crystals can be actively modulated
after infiltrating nematic liquid crystals into the microcavity in
PC waveguides with square lattices. Then we can control light
propagation in a PC waveguide. We analyze the <mml:math id="E1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Q</mml:mi></mml:math>-factors and
resonance frequencies of a tunable PC channel drop filter by
considering various indices modulation of liquid crystals. The
novel component can be used as wavelength division multiplexing in
photonic integrated circuits.

Chen-Yang Liu

Lien-Wen Chen

Tunable Channel Drop Filter in a Two-Dimensional Photonic Crystal Modulated by a Nematic Liquid Crystal

The electronic states of carriers between two concentric spheres of Kane-type semiconductor are theoretically investigated and compared with the results of the parabolic band approximation. Calculations are performed for a hard-wall confinement potential and the eigenstates and the eigenvalues of the Kane Hamiltonian are obtained. Taking into account the real band structure (strong spin-orbital interaction, narrow band gap), the size dependence of the energy of electrons, light holes, and spin-orbital splitting holes in InSb semiconductor concentric spheres are calculated. According to the obtained results both in parabolic and nonparabolic (Kane model) cases, the electron energy levels come close to each other with the increasing of the radius.

Arif Babayev

Sukru Cakmaktepe

Deniz Turkoz

The Energy Spectrum of Carriers between Two Concentric Spheres of Kane-Type Semiconductors

<mml:math id="E2" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>Sb</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>3</mml:mn></mml:msub></mml:math> nanoparticles, nanowires, and nanoribbons have
been selectively synthesized in a controlled manner under mild
conditions by using CTAB as a soft template. By adopting <mml:math id="E3" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mtext>Sb</mml:mtext><mml:msubsup><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>OH</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mn>4</mml:mn><mml:mo>−</mml:mo></mml:msubsup></mml:math> as an inorganic precursor and the
concentration of CTAB as an adjusting parameter, morphologies of <mml:math id="E4" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>Sb</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>3</mml:mn></mml:msub></mml:math> nanostructures can be selectively controlled.
Typically, <mml:math id="E5" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>C</mml:mtext><mml:mrow><mml:mtext>CTAB</mml:mtext></mml:mrow></mml:msub><mml:mo>&lt;</mml:mo><mml:mn>0.15</mml:mn></mml:math> mmol favors the formation of
nanoparticles (product one or short form P1); when the
concentration of CATB is in the range 0.15–2.0 mmol,
nanowires (P2) dominate the products; nanoribbons (P3) form above
the concentration of 2.0 mmol, and when the concentration of CTAB
goes further higher, treelike bundles of nanoribbons could be
achieved. The method in the present study has potential advantages
of easy handling, relatively low-cost, and large-scale production.
The facile and large-scale synthesis of varied <mml:math id="E6" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>Sb</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>3</mml:mn></mml:msub></mml:math> nanostructures is believed to be useful for the application of
catalysis and flame retardance.

Changhui Ye

Guangye Wang

Mingguang Kong

Lide Zhang

Controlled Synthesis of <svg style="vertical-align:-3.3907pt" height="16.450001" version="1.1" viewBox="0 0 42.1875 16.450001" width="42.1875" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg">
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t30 -51.5t49 -42.5t67 -16q56 0 88 32.5t32 87.5q0 51 -31.5 82t-98.5 67q-80 44 -110 73q-55 53 -55 124q0 75 56 126.5t150 51.5q53 0 126 -23z"/>
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q0 45 -26.5 69.5t-68.5 24.5q-67 0 -120 -79l-20 20l43 63q51 56 127 56h1q66 0 107 -37t41 -95q0 -42 -31 -71q-22 -23 -68 -54z"/>
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	</svg> Nanoparticles, Nanowires, and Nanoribbons


About this journal

<p><em>Journal of Nanomaterials</em> publishes research on nanoscale and nanostructured materials with an emphasis on synthesis, processing, characterization, and the applications of nanomaterials.</p>


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<p>Chief Editor Stefano Bellucci is Professor of Theoretical Physics at the National Institute for Nuclear Physics in Frascati, Italy. His research interests include&nbsp;nanoscience and nanotechnology, nanocarbon-based composites, and the biomedical applications of nanomaterials.</p>


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title

Journal of Nanomaterials publishes research on nanoscale and nanostructured materials with an emphasis on synthesis, processing, characterization, and the applications of nanomaterials.

Journal of Nanomaterials