Author
Kevin Kendall
Other affiliations: Imperial Chemical Industries, University of Cambridge, Keele University ...read more
Bio: Kevin Kendall is an academic researcher from University of Birmingham. The author has contributed to research in topics: Solid oxide fuel cell & Ceramic. The author has an hindex of 46, co-authored 197 publications receiving 17295 citations. Previous affiliations of Kevin Kendall include Imperial Chemical Industries & University of Cambridge.
Topics: Solid oxide fuel cell, Ceramic, Adhesion, Brittleness, Anode
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the influence of surface energy on the contact between elastic solids is discussed and an analytical model for its effect upon the contact size and the force of adhesion between two lightly loaded spherical solid surfaces is presented.
Abstract: This paper discusses the influence of surface energy on the contact between elastic solids. Equations are derived for its effect upon the contact size and the force of adhesion between two lightly loaded spherical solid surfaces. The theory is supported by experiments carried out on the contact of rubber and gelatine spheres.
6,981 citations
Book•
01 Jan 2003
TL;DR: In this article, the authors present a history of SOFCs, including the development of cell-and-stack designs, cell and stack modelling, and cell and Stack testing.
Abstract: Introduction History of SOFCs Thermodynamics Electrolyte Cathode Anode Interconnect (ceramic, metallic) Electrode Polarizations Fuels and Fuel Processing Cell and Stack Designs Cell and Stack Modelling Cell and Stack Testing Applications and Demonstrations
1,731 citations
TL;DR: In this paper, a simple, inexpensive way of preparing a ceramic material that contains such weak interfaces is described, where Silicon carbide powder is made into thin sheets which are coated with graphite to give weak interfaces and then pressed together and sintered without pressure.
Abstract: THE major problem with the use of ceramics as structural materials is their brittleness. One way of overcoming this problem is to introduce weak interfaces which deflect a growing crack1. Polymer composites of this sort can be easily prepared by surrounding fibres with liquid plastic. To make similar structures with ceramic matrices and fibres is difficult and expensive, however, because traditional ceramic processing techniques of powder compaction and sintering prevent densification and cause cracking2–4. Here we describe a simple, inexpensive way of preparing a ceramic material that contains such weak interfaces. Silicon carbide powder is made into thin sheets which are coated with graphite to give weak interfaces and then pressed together and sintered without pressure. Relative to the monolithic material, the apparent fracture toughness for cracks propagating normal to the weak interfaces is increased more than fourfold, and the work required to break the samples increases by substantially more than a hundredfold. The technique should be readily applicable to other ceramics.
761 citations
TL;DR: In this article, the authors show that the force required to peel an elastic film from a rigid substrate depends not only on the adhesive surface energy but also on an elastic deformation term.
Abstract: An energy balance shows that the force required to peel an elastic film from a rigid substrate depends not only on the adhesive surface energy but also on an elastic deformation term. This elastic term, tending to reduce the adhesion force, can only be significant in two instances: for materials which can support stresses approaching the elastic modulus without fracturing, and for very small peel angles. Experiments using rubber peeling from glass over a range of peel angles support the theory.
687 citations
TL;DR: In this article, an equilibrium theory of adhesion between elastic solids is developed, which relies on the interfacial surface energy and on the geometry and elastic constants of the adherent bodies.
Abstract: An equilibrium theory of adhesion between elastic solids is developed. Adhesion is shown to depend on the interfacial surface energy and on the geometry and elastic constants of the adherent bodies. The theory is used to interpret the well-known adhesion tests - the pull-off, peel and scratch tests - and the spontaneous peeling of thin films is discussed. Experiments on contacts between Perspex and gelatine surfaces support the analysis.
630 citations
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TL;DR: In this paper, the synthesis, characterization, and proposed mechanism of formation of a new family of silicatelaluminosilicate mesoporous molecular sieves designated as M41S is described.
Abstract: The synthesis, characterization, and proposed mechanism of formation of a new family of silicatelaluminosilicate mesoporous molecular sieves designated as M41S is described. MCM-41, one member of this family, exhibits a hexagonal arrangement of uniform mesopores whose dimensions may be engineered in the range of - 15 A to greater than 100 A. Other members of this family, including a material exhibiting cubic symmetry, have ken synthesized. The larger pore M41S materials typically have surface areas above 700 m2/g and hydrocarbon sorption capacities of 0.7 cc/g and greater. A templating mechanism (liquid crystal templating-LCT) in which surfactant liquid crystal structures serve as organic templates is proposed for the formation of these materials. In support of this templating mechanism, it was demonstrated that the structure and pore dimensions of MCM-41 materials are intimately linked to the properties of the surfactant, including surfactant chain length and solution chemistry. The presence of variable pore size MCM-41, cubic material, and other phases indicates that M41S is an extensive family of materials.
10,349 citations
TL;DR: This review offers details of the technologies, in terms of needs, status, challenges and future R&d directions, that are expected to integrate significant levels of renewables into the electrical grid.
Abstract: The is a comprehensive review on the needs and potential storage technologies for electrical grid that is expected to integrate significant levels of renewables. This review offers details of the technologies, in terms of needs, status, challenges and future R&d directions.
4,096 citations
TL;DR: The atomic force microscope (AFM) is not only used to image the topography of solid surfaces at high resolution but also to measure force-versus-distance curves as discussed by the authors, which provide valuable information on local material properties such as elasticity, hardness, Hamaker constant, adhesion and surface charge densities.
3,281 citations
TL;DR: The common design motifs of a range of natural structural materials are reviewed, and the difficulties associated with the design and fabrication of synthetic structures that mimic the structural and mechanical characteristics of their natural counterparts are discussed.
Abstract: Natural structural materials are built at ambient temperature from a fairly limited selection of components. They usually comprise hard and soft phases arranged in complex hierarchical architectures, with characteristic dimensions spanning from the nanoscale to the macroscale. The resulting materials are lightweight and often display unique combinations of strength and toughness, but have proven difficult to mimic synthetically. Here, we review the common design motifs of a range of natural structural materials, and discuss the difficulties associated with the design and fabrication of synthetic structures that mimic the structural and mechanical characteristics of their natural counterparts.
3,083 citations
2,187 citations