Quartz Crystal Microbalance Determination of Laser Photochemical Deposition Rates: Mechanism of Laser Photochemical Deposition From the Group 6 Hexacarbonyls

1987 ◽  
Vol 101 ◽  
Author(s):  
Robert L. Jackson ◽  
George W. Tyndall
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Crystal Surface ◽  
Single Photon ◽  
Substrate Surface ◽  
Normal Incidence ◽  
Deposition Rates ◽  
Photochemical Deposition ◽  
Group 6 ◽  
Simple Equations

ABSTRACTA quartz crystal microbalance has been used to measure the rates of focused uv laser-induced deposition from the Group 6 hexacarbonyls in real time. The experimental configuration employs acwuv laser beam focused onto the microbalance crystal surface at normal incidence to deposit material by decomposition of a metal complex vapor. Simple equations are given for determining absolute deposition rates in terms of the total mass deposited per unit time. Kinetic data obtained with this system have been used to study the mechanism of laser photodeposition from Cr(CO)e, Mo(CO)6, and W(CO)é induced by a frequency-doubled argon ion laser. The rate-determining deposition step involves condensation of products formed upon single-photon dissociation of the metal carbonyls in the gas phase. Additional observations indicate that the adsorbed photoproducts undergo further photo-initiated dissociation on the substrate surface.

A gravimetric analysis of protein–oligosaccharide interactions

2003 ◽  
Vol 31 (2) ◽  
pp. 349-351 ◽  
Author(s):  
T. Rudd ◽  
J.T. Gallagher ◽  
D. Ron ◽  
R.J. Nichols ◽  
D.G. Fernig
Keyword(s):  
Growth Factors ◽  
Growth Factor ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Crystal Surface ◽  
Thiol Group ◽  
Gravimetric Analysis ◽  
Unit Change ◽  
Surface Vibrations ◽  
Structure Orientation

Interactions between an immobilized, heparin-derived octasaccharide and growth factors have been observed using a quartz crystal microbalance-dissipation (QCM-D). This device can measure the amount of growth factors binding to the octasaccharide surface and also the change of dissipation of the surface. Dissipation is a measure of how the adhered material ‘damps’ the surface vibrations. The octasaccharides were anchored through their reducing ends by the intermediary of the alkanethiol molecule, which covalently binds to the crystal surface through the thiol group. As expected, heparin sulphate binding growth factors bound to the octasaccharide, but the change in mass of growth factor bound per unit change in dissipation is different for the different growth factors. Suggesting that the structures of the various growth factor–octasaccharide complexes are different, therefore, indicates that the change in dissipation can give insights into the structure, orientation and packing of the oligosaccharide-growth factor complexes.

Application of the Quartz Crystal Microbalance to Corrosion Investigation

1998 ◽  
Author(s):  
Hejian Sun ◽  
John C. Donini ◽  
Kirk H. Michaelian ◽  
Sankara Papavinasam ◽  
R. Winston Revie
Keyword(s):  
Quartz Crystal Microbalance ◽  
Salt Solution ◽  
Quartz Crystal ◽  
Crystal Surface ◽  
Corrosion Behaviour ◽  
Sensitive Technique ◽  
Solution Resistance ◽  
Oil Gas ◽  
Corrosion Investigation ◽  
Pipeline Corrosion

The quartz crystal microbalance (QCM) provides an extremely sensitive technique for detecting small changes in mass and viscosity on the quartz crystal surface. QCM can be used in oil, gas or water without the problems of high solution resistance. In order to use QCM to model pipeline corrosion, an iron quartz crystal electrode was prepared using an electrodeposition method. The reproducibility, effectiveness and accuracy of the iron QCM were tested in salt solution. The adsorption of amines was studied to investigate their effects on the corrosion behaviour of the iron QCM.

Uv Laser-Induced Etching of the First-Row Transition Metals

1989 ◽  
Vol 158 ◽  
Author(s):  
George W. Tyndall
Keyword(s):  
Transition Metals ◽  
Laser Beam ◽  
Quartz Crystal Microbalance ◽  
Laser Fluence ◽  
Quartz Crystal ◽  
Normal Incidence ◽  
Uv Laser ◽  
Polycrystalline Metal ◽  
Kinetic Information ◽  
Laser Induced Etching

ABSTRACTThe 248 nm excimer laser-induced etching of Ti, Cr, Fe, Co, Ni, and Cu by Br2 has been studied. The experiment consists of focusing the pulsed UV laser beam at normal incidence onto the surface of a quartz crystal microbalance (QCM) coated with 1μm of polycrystalline metal. Absolute etch rates are determined as a function of the Br2 pressure and the laser fluence. On the basis of the kinetic information, four mechanisms are proposed to explain the etching of these transition metals.

scholarly journals A Study of the Initial Stages of Co Deposition on a Silver Electrode in Ammonia Medium Using an Electrochemical Quartz Crystal Microbalance

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
A. Montes-Rojas ◽  
A. L. Donjuan-Medrano
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Substrate Surface ◽  
Deposition Process ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Silver Electrode ◽  
Cobalt Hydroxide ◽  
Ammonia Adsorption ◽  
Cobalt Deposition ◽  
Ammonia Medium

The early stages of Co deposition on a silver electrode in ammonia medium were studied using cyclic voltammetry and chronoamperometry coupled with quartz crystal microbalance (EQCM) in ammonia solution. The results obtained by means of EQCM showed that during the initial stages of cobalt deposition a monolayer is formed on the substrate both in the underpotential and overpotential region, and this monolayer is formed at −600 mV and −980 mV. Once the cobalt deposition process starts, the growth is very fast making the investigation of the initial stages rather difficult. During this process, cobalt atoms transfer their two electrons through free species and not through cobalt hydroxide species adsorbed on the electrode as CoOH+ or Co(OH)2. In addition, it has been found that at potentials more positive than −600 mV, ammonia adsorption takes place on the substrate surface, and theses species are replaced when the cobalt atoms arrive at potentials more negative than −600 mV.

Interaction of Clear Flavor Emulsions Containing Lemon Essential Oils with Lipid Bilayers via a Quartz Crystal Microbalance

2019 ◽  
Vol 25 (6) ◽  
pp. 879-884
Author(s):  
Takahiro Sakai ◽  
Hayato Seki ◽  
Shogo Yoshida ◽  
Hayato Hori ◽  
Hisashi Suzuki ◽  
...  
Keyword(s):  
Essential Oils ◽  
Lipid Bilayers ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal

Effect of Current Distribution on Quartz Crystal Microbalance Measurements

1998 ◽  
Vol 145 (2) ◽  
pp. 492-497 ◽  
Author(s):  
James J. Kelly ◽  
K. M. Anisur Rahman ◽  
Christopher J. Durning ◽  
Alan C. West
Keyword(s):  
Quartz Crystal Microbalance ◽  
Current Distribution ◽  
Quartz Crystal
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