نتایج جستجو برای: 0 bnnt

تعداد نتایج: 571734  

2014
Amanda L. Tiano Cheol Park Joseph W. Lee Hoa H. Luong Luke J. Gibbons Sang-Hyon Chu Samantha I. Applin Peter Gnoffo Sharon Lowther Hyun Jung Kim Paul M. Danehy Jennifer A. Inman Stephen B. Jones Jin Ho Kang Godfrey Sauti Sheila A. Thibeault Vesselin Yamakov Kristopher E. Wise Ji Su Catharine C. Fay

Scientists have predicted that carbon’s immediate neighbors on the periodic chart, boron and nitrogen, may also form perfect nanotubes, since the advent of carbon nanotubes (CNTs) in 1991. First proposed then synthesized by researchers at UC Berkeley in the mid 1990’s, the boron nitride nanotube (BNNT) has proven very difficult to make until now. Herein we provide an update on a catalyst-free m...

2011
Shin-Pon Ju Yao-Chun Wang Ting-Wei Lien

The effect of uni-axial strain on the electronic properties of (8,0) zigzag and (5,5) armchair boron nitride nanotubes (BNNT) is addressed by density functional theory calculation. The stress-strain profiles indicate that these two BNNTS of differing types display very similar mechanical properties, but there are variations in HOMO-LUMO gaps at different strains, indicating that the electronic ...

Journal: :Crystals 2022

In the present study, four materials based on boron nitride nanotubes—namely pristine BNNT, C-doped tetrapeptide/BNNT, and tetrapeptide/C-doped BNNT—were examined to evaluate adsorption of organophosphorus pesticides chlorpyrifos fenitrothion. Through a quantum chemical approach molecular electronic structures, impacts C doping tetrapeptide modification nanotubes are clarified. The results reve...

2013
Maho Yamaguchi Amir Pakdel Chunyi Zhi Yoshio Bando Dai-Ming Tang Konstantin Faerstein Dmitry Shtansky Dmitri Golberg

Multiwalled boron nitride nanotubes (BNNTs) have very attractive mechanical and thermal properties, e.g., elasticity, tensile strength, and high resistance to oxidation, and may be considered as ideal reinforcing agents in lightweight metal matrix composites. Herein, for the first time, Al-BNNT ribbons with various BNNT contents (up to 3 wt.%) were fabricated via melt spinning in an argon atmos...

Journal: :ACS applied nano materials 2021

Near-field spectroscopy has been extensively applied recently to analyze collective optical properties of materials at the nanoscale. However, vibrations small molecules were only recognizable in close proximity a metallic resonator. We show that encapsulation boron nitride nanotubes (BNNT) enhances near-field vibrational spectra C$_{60}$ fullerene, reaching sensitivity limit few hundred molecu...

Journal: :Science 2003
W Mickelson S Aloni Wei-Qiang Han John Cumings A Zettl

We have created insulated C60 nanowire by packing C60 molecules into the interior of insulating boron nitride nanotubes (BNNTs). For small-diameter BNNTs, the wire consists of a linear chain of C60 molecules.With increasing BNNT inner diameter, unusual C60 stacking configurations are obtained (including helical, hollow core, and incommensurate) that are unknown for bulk or thin-film forms of C6...

2010
Hessam M. Ghassemi Chee Huei Lee Yoke Khin Yap Reza S. Yassar

Using a novel in-situ scanning tunneling microscope integrated into a 200kV transmission electron microscope (TEM), we have shown that boron nitride nanotubes (BNNTs) possess remarkable flexibility and convert from insulator to semi-conductor upon bending. To measure the electrical properties, the BNNT was bent between two gold contacts constructing a metal-semiconductor-metal circuit. The resi...

In the present study, free vibration behaviors of of carbon nanotube (CNT) and boron nitride nanotube (BNNT) have been investigated via Eringen’s nonlocal continuum theory. Size effect has been considered via nonlocal continuum theory. Nanotubes have become popular in the world of science thanks to their characteristic properties. In this study, free vibrations of Boron Nitride Nanotube (BNNT) ...

Journal: :International journal of engineering and applied sciences 2021

Boron Nitride Nanotube (BNNT) is a promising nano sized structure with superior electrical, physical, and mechanical properties comparing to Carbon nanotube. Higher Young’s modulus, oxidation resistance, hardness, corrosion durability in high temperature, piezoelectric pyroelectric characteristics are some featured of BNNT. In this paper the critical buckling load investigated. Two different me...

2013
Saban Kalay Zehra Yilmaz Mustafa Çulha

Colemanite (Ca2B6O11·5H2O) is a natural and new precursor material for the synthesis of boron nitride nanotubes (BNNTs). BNNTs have been synthesized from unprocessed colemanite for the first time. The reaction parameters such as time, catalyst type, catalyst amount and temperature were optimized. It was found that the BNNT formation follows the base growth mechanism, which was initiated with a ...

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