Engineering Commons^™

Polyester-Graft-Phosphorylcholine Prepared By Ring-Opening Polymerization And Click Chemistry, Beth M. Cooper, Delphine Chan-Seng, Debasis Samanta, Xiongfei Zhang, Sangram Parelkar, Todd S. Emrick

Todd S. Emrick

Phosphorylcholine (PC)-substitution on aliphatic polyesters is accomplished by click chemistry with PC-substituted azides.

Design And Demonstration Of A Small-Animal Up-Conversion Imager, Christopher Salthouse, Scott Hildebrand, Ralph Weissleder, Umar Mahmood

Christopher Salthouse

This first small-animal up-conversion imager (SAUCI) was developed and used for in-vivo imaging of up-converting nanoparticles (UCNs.) Unlike traditional fluorophores, UCNs absorb multiple lower-energy photons and emit a single higher-energy photon. This unique physical process makes it possible to image deeper into tissue with lower background signals. In vivo imaging of particle accumulation in the liver was demonstrated following intravenous injection of particles.

Centers Of Polymer Science: Introduction, Otto Vogl

Otto Vogl

Centers of Polymer Science describes polymer research activities taking place in Europe, Asia, and Australia primarily during the years between 1980 and 2000. This series of articles shows and records the activity in Polymer Science in this part of polymer history.

Book I, Otto Vogl: Papers And Patents, 1948-1970, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Surface Wrinkling Behavior Of Finite Circular Plates, Derek Breid, Alfred Crosby

Alfred Crosby

Osmotically-driven surface buckling is a simple method for introducing controlled micro- and nano-scale topography onto material surfaces. To achieve a fundamental understanding of the buckling process and a library of the equilibrium and kinetically-trapped structures that can be attained, we observe the growth processes of a buckling silicate plate rigidly attached to an elastomeric substrate. The primary variable is the lateral extent of the silicate plate which is shown to dictate the location of buckle initiation, and thus the resulting morphology of the final buckled structure. We present a model to qualitatively describe the radial stress profile within the plate, …

Book Ii, Otto Vogl: Papers And Patents, 1970-1977, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Pegylated Silicon Nanoparticles: Synthesis And Characterization, P. K. Sudeep, Zachariah Page, Todd S. Emrick

Todd S. Emrick

Silicon nanoparticles were prepared and functionalized with alkene-terminated poly(ethylene oxide) to impart amphiphilic solution properties to the particles.

Book Iii, Otto Vogl: Publications, 1977-1979, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book Iv, Otto Vogl: Publications, 1979-1981, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book V, Otto Vogl: Publications, 1981-1984, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Superhydrophobicity And Contact-Line Issues, Lc Gao, Ay Fadeev, Tj Mccarthy

Lixin Gao

The wettability of several superhydrophobic surfaces that were prepared recently by simple, mostly single-step methods is described and compared with the wettability of surfaces that are less hydrophobic. We explain why two length scales of topography can be important for controlling the hydrophobicity of some surfaces (the lotus effect). Contact-angle hysteresis (difference between the advancing, θA, and receding, θR, contact angles) is discussed and explained, particularly with regard to its contribution to water repellency. Perfect hydrophobicity (θA/θR = 180°/180°) and a method for distinguishing perfectly hydrophobic surfaces from those that are almost perfectly hydrophobic are described and discussed. The Wenzel …

Uncertainty Analysis In Mcp-Based Wind Resource Assessment And Energy Production Estimation, Matthew Lackner, Anthony L. Rogers, James F. Manwell

Matthew Lackner

This paper presents a mathematical framework to properly account for uncertainty in wind resource assessment and wind energy production estimation. A meteorological tower based wind measurement campaign is considered exclusively, in which measurecorrelate- predict is used to estimate the long-term wind resource. The evaluation of a wind resource and the subsequent estimation of the annual energy production (AEP) is a highly uncertain process. Uncertainty arises at all points in the process, from measuring the wind speed to the uncertainty in a power curve. A proper assessment of uncertainty is critical for judging the feasibility and risk of a potential wind …

Adaptive Polymer Particles, Kyriaki Kalaitzidou, Alfred Crosby

Alfred Crosby

Adaptable polymer particles that can change geometry, flow characteristics, and adsorption properties upon the stimulation of an environmental change, such as temperature, are fabricated by utilizing the residual stress developed at the interface of a bilayer. We propose a phase diagram that can be used to predict the shape and size of the adaptive polymer particles as a function of the material modulus, thickness ratio, and the bilayer’s lateral dimensions. The materials used are gold/titanium and polydimethylsiloxane, but the method is applicable to a wide range of material combinations. Initial demonstrations of this responsive control and its impact on properties …

Fracture-Induced Alignment Of Surface Wrinkles, Charles J. Rand, Renee Sweeney, Mary Morrissey, Lauren Hazel, Alfred Crosby

Alfred Crosby

We introduce a simple process for creating materials that produce osmotically-driven surface wrinkles with long-range alignment, sans lithographically-defined topography and selective oxidation. Mechanically-induced surface defects create stress discontinuities that convert the global biaxial stress state to local uniaxial stresses, producing aligned wrinkles across the surface.

Integrating Cell Cycle Progression, Drug Penetration And Energy Metabolism To Identify Improved Cancer Therapeutic Strategies, Raja Venkatasubramanian, Michael A. Henson, Neil S. Forbes

Michael A Henson

The effectiveness of chemotherapeutic drugs in tumors is reduced by multiple effects including drug diffusion and variable susceptibility of local cell populations. We hypothesized that quantifying the interactions between drugs and tumor microenvironments could be used to identify more effective anti-cancer strategies. To test this hypothesis we created a mathematical model that integrated intracellular metabolism, nutrient and drug diffusion, cell-cycle progression, cellular drug effects, and drug pharmacokinetics. To our knowledge, this is the first model that combines these elements and has coupled them to experimentally derived parameters. Drug cytotoxicity was assumed to be cell-cycle phase specific, and progression through the …

Book Vi, Otto Vogl: Publications, 1984-1986, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book Vii, Otto Vogl: Publications, 1987-1989, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book Viii, Otto Vogl: Publications, 1989-1992, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book Ix, Otto Vogl: Publications, 1993-1995, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book X, Otto Vogl: Publications, 1996-1998, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book Xi, Otto Vogl: Publications, 1999-2000, Jane C. Vogl

Otto Vogl

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Who Was Who In Polymer Science: Faculty Of The Polymer Science & Engineering Department At The University Of Massachusetts Amherst, Otto Vogl

Otto Vogl

Richards S. Stein

Otto Vogl

Robert W. Lenz

MacKnight, William

Karasz, Frank. E.

Farris, Richard

MacCarthy, Thomas

Hsu, Shaw Lin

Green Gasoline By Catalytic Fast Pyrolysis Of Solid Biomass Derived Compounds, George W. Huber, A. Corma, L. Sauvanaud, P. O'Conner

George W. Huber

A fuelling success: High-quality aromatic fuel additives can be produced directly from solid biomass feedstocks by catalytic fast pyrolysis in a single catalytic reactor at short residence times. High heating rates and catalyst-to-feed ratios are needed to ensure that pyrolized biomass compounds enter the pores of the ZSM5 catalyst and that thermal decomposition is avoided. Product selectivity is a function of the active site and pore structure of the catalyst.

Current-Induced Stabilization Of Surface Morphology In Stressed Solids, Dimitrios Maroudas, M. R. Gungor, V. Tomar

Dimitrios Maroudas

We examine the surface morphological evolution of a conducting crystalline solid under the simultaneous action of an electric field and mechanical stress based on a fully nonlinear model and combining linear stability theory with self-consistent dynamical simulations. We demonstrate that electric current, through surface electromigration, can stabilize the surface morphology of the stressed solid against cracklike surface instabilities. The results also have more general implications for the morphological response of solid surfaces under the simultaneous action of multiple external forces.

Mean Field Kinetic Theory For A Lattice Gas Model Of Fluids Confined In Porous Materials, Peter A. Monson

Peter A. Monson

We consider the mean field kinetic equations describing the relaxation dynamics of a lattice model of a fluid confined in a porous material. The dynamical theory embodied in these equations can be viewed as a mean field approximation to a Kawasaki dynamics Monte Carlo simulation of the system, as a theory of diffusion, or as a dynamical density functional theory. The solutions of the kinetic equations for long times coincide with the solutions of the static mean field equations for the inhomogeneous lattice gas. The approach is applied to a lattice gas model of a fluid confined in a finite …

Millisecond Autothermal Steam Reforming Of Cellulose For Synthetic Biofuels By Reactive Flash Volatilization, Paul J. Dauenhauer, Lanny D. Schmidt, Joshua L. Colby

Paul J. Dauenhauer

Three biomass-to-liquid process steps (volatilization of cellulose, tar-cleaning of organic products, and water-gas-shift of the gaseous effluent) have been integrated into a single autothermal catalytic reactor for the production of high quality synthesis gas at millisecond residence times ([similar]30 ms). Particles of cellulose ([similar]300 μm) were directly impinged upon the hot, catalytic bed of Rh–Ce/γ-Al2O3 catalyst on 1.3 mm α-Al2O3 spheres in the presence of O2, N2, and steam in a continuous flow fixed-bed reactor at 500–1100 °C. Complete conversion to gases was observed for all experimental parameters including N2/O2, S/C, the total flow rate of cellulose, and the fuel-to-oxygen …

Coarse Molecular-Dynamics Analysis Of An Order-To-Disorder Transformation Of A Krypton Monolayer On Graphite, Dimitrios Maroudas, I. G. Kevrekidis, V. A. Fonoberov, M. Arienti, M. A. Amat

Dimitrios Maroudas

The thermally induced order-to-disorder transition of a monolayer of krypton (Kr) atoms adsorbed on a graphite surface is studied based on a coarse molecular-dynamics (CMD) approach for the bracketing and location of the transition onset. A planar order parameter is identified as a coarse variable, ψ, that can describe the macroscopic state of the system. Implementation of the CMD method enables the construction of the underlying effective free-energy landscapes from which the transition temperature, Tt, is predicted. The CMD prediction of Tt is validated by comparison with predictions based on conventional molecular-dynamics (MD) techniques. The conventional MD computations include the …

Asymptotic Analysis Of The Selective Dip Coating Of Power-Law Fluids, N Tiwari, Jm Davis

Jeffrey M. Davis

The dip coating of a chemically micropatterned surface bearing alternating wetting and nonwetting vertical strips is analyzed for a non-Newtonian power-law fluid. Asymptotic matching is used to determine the thickness of liquid films deposited on the O(10 μm) strips at small capillary and Bond numbers. The chemical patterning that confines the fluid laterally induces a significant transverse curvature of the free-surface. The streamwise variation in this transverse curvature along the strip provides an additional contribution to the capillary pressure gradient that is not present for uniform surfaces. Consequently, the difference in the thickness of the deposited liquid film relative to …

Understanding Capillary Condensation And Hysteresis In Porous Silicon: Network Effects Within Independent Pores, Peter A. Monson, Sergej Naumov, Alexey Khokhlov, Rustem Valiullin, Jörg Kärger

Peter A. Monson

The ability to exert a significant degree of pore structure control in porous silicon materials has made them attractive materials for the experimental investigation of the relationship between pore structure, capillary condensation, and hysteresis phenomena. Using both experimental measurements and a lattice gas model in mean field theory, we have investigated the role of pore size inhomogeneities and surface roughness on capillary condensation of N2 at 77 K in porous silicon with linear pores. Our results resolve some puzzling features of earlier experimental work. We find that this material has more in common with disordered materials such as Vycor glass …

Synthesis And Characterization Of Amphiphilic O-Phenylene Ethynylene Oligomers, Morris M. Slutsky, Jason S. Phillip, Gregory N. Tew

Gregory N. Tew

We have previously reported the synthesis of short o-phenylene ethynylene oligomers with polar triethylene glycol side chains which adopt a helical conformation in solution with three residues per turn. Two new oligomers have been synthesized, a hexamer and a nonamer, incorporating a repeated triad motif of polar–nonpolar–polar sidechains in order to create a hydrophobic stripe in the folded conformation which we report here for the first time. Helical folding in solution was observed and, unlike the previously-reported oligomers, these new oligomers are ordered solids at room temperature. Although these oligomers were designed to assemble into helical bundle-like structures, no evidence …