Alignment dynamics of single-walled carbon nanotubes in pulsed ultrahigh magnetic fields.
نویسندگان
چکیده
We have measured the dynamic alignment properties of single-walled carbon nanotube (SWNT) suspensions in pulsed high magnetic fields through linear dichroism spectroscopy. Millisecond-duration pulsed high magnetic fields up to 56 T as well as microsecond-duration pulsed ultrahigh magnetic fields up to 166 T were used. Because of their anisotropic magnetic properties, SWNTs align in an applied magnetic field, and because of their anisotropic optical properties, aligned SWNTs show linear dichroism. The characteristics of their overall alignment depend on several factors, including the viscosity and temperature of the suspending solvent, the degree of anisotropy of nanotube magnetic susceptibilities, the nanotube length distribution, the degree of nanotube bundling, and the strength and duration of the applied magnetic field. To explain our data, we have developed a theoretical model based on the Smoluchowski equation for rigid rods that accurately reproduces the salient features of the experimental data.
منابع مشابه
High Field Magneto-optical Spectroscopy of Semiconducting Single-walled Carbon Nanotubes
Single-walled carbon nanotubes (SWNTs) present an ideal system for study of one dimensional physics. Classically speaking, their long persistence lengths result in rigid-rod-like behavior in the solution-phase. Quantum mechanically speaking, extreme confinement in the radial direction result in interesting properties for optically excited correlated electron-hole pairs, or excitons. In addition...
متن کاملInvestigation of Different Solvents and Temperatures Effects on (3,7) Single-Walled Carbon Nanotubes: DFT Study
In this research, we have studied the structural propenies of water. methanol and ethanol surrounding snidewalledcarbon nanotube (SWCNT) and mixed of them either and we have investigated the solvent effects onthe relative energies and dipole moment values by ming molecular dynamics simulation. We used differentforce field it, deterrnaned energy and other type of geometrical parameters, on the p...
متن کاملMolecular Dynamics Investigation of The Elastic Constants and Moduli of Single Walled Carbon Nanotubes
Determination of the mechanical properties of carbon nanotubes is an essential step in their applications from macroscopic composites to nano-electro-mechanical systems. In this paper we report the results of a series of molecular dynamics simulations carried out to predict the elastic constants, i.e. the elements of the stiffness tensor, and the elastic moduli, namely the Young’s and shear mod...
متن کاملRadius Dependence of Hydrogen Storage Inside Single Walled Carbon Nanotubes in an Array
In this study, we have investigated radius dependence of hydrogen storage within armchair (n,n) single walled carbon nanotubes (SWCNT) in a square arrays. To this aim, we have employed equilibrium molecular dynamics (MD) simulation. Our simulations results reveal that radius of carbon nanotubes are an important and influent factor in hydrogen distribution inside carbon nanotubes and consequentl...
متن کاملHeating-Enhanced Dielectrophoresis for Aligned Single-Walled Carbon Nanotube Film of Ultrahigh Density
In this paper, we demonstrate that the alignment density of individualized single-walled carbon nanotubes (SWCNTs) can be greatly improved by heating-enhanced dielectrophoresis (HE-DEP) process. The observations by scanning electron microscope (SEM) suggest ultrahigh alignment density and good alignment quality of SWCNTs. The intuitive alignment density of individualized SWCNTs is much higher t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- ACS nano
دوره 3 1 شماره
صفحات -
تاریخ انتشار 2009