Low frequency vibrational modes related to texture in silica aerogels

نویسندگان
چکیده

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

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Low-frequency vibrational modes of riboflavin and related compounds

The low-frequency vibrations of riboflavin and related compounds (alloxazine, lumichrome, lumiflavin as the ring system and Dmannitol as the side-chain system) were observed by far-infrared (terahertz) spectroscopy. Vibrational mode assignments in this spectrally congested range were made using high precision quantum chemical calculations. These resonance frequencies located below 200 cm 1 indi...

متن کامل

Calculation of Low-Frequency Vibrational Modes of Biologically Important Isomers

In this paper we compare the value of different molecular modeling techniques for the prediction of vibrational modes, especially in the midand far-infrared region. There is a wide range of different levels of theory available for molecular modelling—the choice depending on the kind of system to be investigated. For our calculations we use different theoretical approaches such as Hartree-Fock a...

متن کامل

Painting biological low-frequency vibrational modes from small peptides to proteins.

Protein low-frequency vibrational modes are an important portion of a proteins' dynamical repertoire. Yet, it is notoriously difficult to isolate specific vibrational features in the spectra of proteins. Given an appropriately chosen model peptide, and using different experimental conditions, we can simplify the system and gain useful insights into the protein vibrational properties. Combining ...

متن کامل

Probing the low-frequency vibrational modes of viruses with Raman scattering--bacteriophage M13 in water.

Raman spectroscopy is used to study low-wave-number (</=20 cm(-1)) acoustic vibrations of the M13 phage. A well-defined Raman line is observed at around 8.5 cm(-1). The experimental results are compared with theoretical calculations based on an elastic continuum model and appropriate Raman selection rules derived from a bond polarizability model. The observed Raman mode is shown to belong to on...

متن کامل

Integration of Silica Aerogels in Microfluidic Chips

This paper reports a method to integrate silica aerogels monolithically in microfluidic chips. Silica Aerogel is a highly porous bulk material. The gel was synthesized from tetraethyl orthosilicate by a sol-gel process. Polyethylene glycol and an extended aging period were used to strengthen the matrix minimizing gel shrinkage. This technique allows alcogel structures with high strength and sti...

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

ژورنال

عنوان ژورنال: Journal de Physique

سال: 1990

ISSN: 0302-0738

DOI: 10.1051/jphys:01990005105043300