From ceegradv@ce.washington.edu Mon Nov 16 13:10:25 1998 Received: from mxu4.u.washington.edu (mxu4.u.washington.edu [140.142.33.8]) by lists.u.washington.edu (8.8.4+UW97.07/8.8.4+UW98.06) with ESMTP id NAA45050 for ; Mon, 16 Nov 1998 13:10:24 -0800 Received: from maximus.ce.washington.edu (maximus.ce.washington.edu [128.95.204.227]) by mxu4.u.washington.edu (8.9.1+UW98.09/8.9.1+UW98.09) with ESMTP id NAA11299 for ; Mon, 16 Nov 1998 13:10:23 -0800 Received: from localhost (ceegradv@localhost) by maximus.ce.washington.edu (8.8.8/UWCE-server-1.0) with SMTP id NAA28148 for ; Mon, 16 Nov 1998 13:10:23 -0800 (PST) Date: Mon, 16 Nov 1998 13:10:22 -0800 (PST) From: CEE Grad Advising Reply-To: CEE Grad Advising To: Graduate Students in CEE Subject: Seminar Today - Department of Chemistry (fwd) Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Date: 16 Nov 1998 09:04:23 -0800 From: LaDonna Kennedy Monday, November 16, 1998 3:30 p.m. Physics-Astronomy Building A114 The Strength of Bonding between Metals and Solid Oxide Surfaces, and Its Effect on Metal Catalyst Dispersion and Catalytic Properties" Prof. Charles Campbell Department of Chemistry University of Washington ABSTRACT Metal - oxide interactions are important in catalysis, microelectronics, materials, and metal transport in soil. We have measured the heats of adsorption of metals on clean, single-crystalline surfaces using a pulsed metal atom beam and pyroelectric heat detection. The differential heat of adsorption is measured versus coverage. The heat of adsorption, integrated to multilayer coverage, also provides the adhesion energy between the solids. Adsorption energies for metals (Pb or Cu) on well-defined surface oxides of Mo(100) and W(100) and on clean and hydroxylated MgO(100) thin films correlate with the resulting growth morphology of the metal films. These energetics also control the catalytic activity, dispersion and sintering behaviour of oxide-supported metal catalyst particles. .