INFLUENCE OF SURFACE FUNCTIONAL GROUPS ON MOLECULAR ADSORPTION BY SINGLE WALLED CARBON NANOTUBES (SWNTs)

نویسندگان

  • Xue Feng
  • Seokjoon Kwon
  • Radisav Vidic
  • Eric Borguet
چکیده

Experimental A stainless steel ultra high vacuum (UHV) chamber, pumped by a turbo molecular pump backed by a mechanical pump, providing a base pressure of 5X10 torr after bake out, was used for temperature programmed desorption (TPD) experiments with a typical heating rate of 2.5 K/s. Samples could be cooled below 100 K via a liquid nitrogen dewar and heated up to 1300 K via resistive heating. A detailed description was provided previously [7]. Infrared studied were preformed in another high vacuum chamber with base pressure of 2X10 torr. Samples could be cooled to 90 K via a liquid nitrogen dewar and heated up to 1400 K via resistive heating. Molecules were purified and dosed into both chambers through a leak valve. Exposure was reported in Langmuir units (1L = 10 torr·s).

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Investigation of hydralazine drug adsorption on functionalized single-walled carbon nanotubes by density functional theory (DFT) method

Background: In recent years, advances in nanotechnology presents opportunities to overcome limitations in targeted drug delivery. Nano drug carriers have the ability to change the pharmacokinetics of drugs and can improve efficacy and reduce side effects. The objective of the present work is to study the interaction of Hydralazine with functionalized carbon nanotubes by performing density funct...

متن کامل

A First-Principles Study on Interaction between Carbon Nanotubes (10,10) and Gallates Derivatives as Vehicles for Drug Delivery

First principles calculations were carried out for investigation the novel 7-hydroxycoumarinyl gallates derivatives in gas and liquid phases using density functional theory (DFT) method. Computational chemistry simulations were carried out to compare calculated quantum chemical parameters for gallates derivatives. All calculations were performed using DMol3 code which is based on DFT. The Doubl...

متن کامل

Theoretical Calculations of the Effect of Finite Length on the Structural Properties of Pristine and Nitrogen-doped Carbon Nanotubes

The effect of impurities on quantum chemical parameters of single-walled nanotubes (SWNTs) was studied using density functional theory (DFT). The density of states (DOS), Fermi energy and thermodynamic energies of (5,5) carbon nanotubes were calculated in the presence of nitrogen impurity. It was found that this nanotube remains metallic after being doped with one nitrogen atom. The partial den...

متن کامل

Effect of Acid Treatment of Carbon Nanotubes on Their Adsorption Capacities of Benzene and Toluene

Toluene and benzene were eliminated using multi-walled carbon nanotubes (MWCNTs). In order to investigate influence of acid treatment on the MWCNTs adsorption capacities, the MWCNTs were functionalized by nitric acid (10 M) under reflux conditions for 2 h. Fourier transform infrared (FTIR) and Raman spectroscopy were employed to confirm the formation of functional groups on the nanotubes su...

متن کامل

Increasing the hydrogen storage capacity of single-walled carbon nanotube (SWNT) through facile impregnation by TiO2, ZrO2 and ZnO nanocatalysts

Various nanocomposites of TiO2, ZnO and ZrO2 decorated single wall Carbon nanotubes (SWNTs) were fabricated by facile and template free continuous ultrasonication/stirring of virgin metal oxide nanopowders and SWNTs in ethanol under UV-light illumination. The TEM micrographs showed that nanoparticles (NPs) were uniformly dispersed and bonded on the surface of SWNTs. The results of XRD as well a...

متن کامل

Amino acids interacting with defected carbon nanotubes: ab initio calculations

The adsorption of a number of amino acids on a defected single-walled carbon nanotube (SWCNT) isinvestigated by using the density-functional theory (DFT) calculations. The adsorption energies andequilibrium distances are calculated for various configurations such as amino acid attaching to defectsites heptagon, pentagon and hexagon in defective tube and also for several molecular orientationswi...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2004