Download or read book Colloidal Interactions in Aquatic Environments written by Patricia L. Taboada-Serrano and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The classical theory of colloids and surface science has universally been applied in modeling and calculations involving solid-liquid interfaces encountered in natural and engineered environments. However, several discrepancies between the observed behavior of charged solid-liquid interfaces and predictions by classical theory have been reported in the past decades. The hypothesis that the mean-field, pseudo-one-component approximation adopted within the framework of the classical theory is responsible for the differences observed is tested in this work via the application of modeling and experimental techniques at a molecular level. Silica and silicon nitride are selected as model charged solid surfaces, and mixtures of symmetric and asymmetric indifferent and non-indifferent electrolytes are used as liquid phases. Canonical Monte Carlo simulations (CMC) of the electrical double layer (EDL) structure of a discretely charged planar silica surface, embedded in solutions of indifferent electrolytes, reveal the presence of a size exclusion effect that is enhanced at larger values of surface charge densities. That effect translates into an unexpected behavior of the interaction forces between a charged planar surface and a spherical particle. CMC simulations of the electrostatic interactions and calculations of the EDL force between a spherical particle and a planar surface, similarly charged, reveal the presence of two attractive force components: a depletion effect almost at contact and a long-range attractive force of electrostatic origin due to ion-ion correlation effects. Those two-force components result from the consideration of discreteness of charge in the interaction of solid-liquid interfaces, and they contradict the classical theory predictions of electrostatic repulsive interaction between similarly charged surfaces. Direct interaction force measurements between a charged planar surface and a colloidal particle, performed by atomic force microscopy (AFM), reveal that, when indifferent and non-indifferent electrolytes are present in solution, surface charge modification occurs in addition to the effects on the EDL behavior reported for indifferent electrolytes. Non-uniformity and even heterogeneity of surface charge are detected due to the action of non-indifferent, asymmetric electrolytes. The phenomena observed explain the differences between the classical theory predictions and the experimental observations reported in the open literature, validating the hypothesis of this work.
Download or read book Colloids in the Aquatic Environment written by Th. F. Tadros and published by Elsevier. This book was released on 2013-10-22 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloids in the Aquatic Environment covers the proceedings of the International Symposium by the same title, held at the University College London on September 7-9, 1992, organized by the SCI Colloid and Surface Chemistry Group. This book is divided into 20 chapters and begins with an introduction to the fundamentals of surface structure and reactivity. The succeeding chapters deal with molecular mass determination of humic substances from natural waters, the biospecific mechanism of double layer formation, the dynamics of colloid deposition in porous media, and the evaluation of surface area and size distributions of soil particles. These topics are followed by discussions of the transport and capture of colloids; colloidal stability of natural organic matter; the hydrolytic precipitation and modeling ion binding by humic acids; and the thermodynamic aspects and photoelectrophoresis of colloids. Other chapters explore the colloidal transfer in several aquatic environments. The final chapters consider the mechanism of colloid detachment, speciation, partitioning, and stability. These chapters also look into a hybrid equilibrium model of solute transport in porous media in the presence of colloids. This book will be of great value to civil and environmental engineers.
Download or read book Colloid containment Interactions in the Natural Aquatic Environment written by Nicolle S. Tulve and published by . This book was released on 1999 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Colloidal Particle surface Interactions in Atmospheric and Aquatic Systems written by Eunhyea Chung and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloidal particles suspended in a liquid or gas phase often interact with a solid-liquid or solid-gas interface. In this study, experimental data through atomic force microscopy and neutron reflectometry and theoretical results of colloidal particle-surface interactions were obtained and compared. Atmospheric and aquatic environments were considered for the interactions of microbial colloidal particles and nano-sized silica particles with planar surfaces. Spores of Bacillus thuringiensis, members of the Bacillus cereus group, were examined as the microbial particles, simulating the pathogens Bacillus cereus and Bacillus anthracis which are potentially dangerous to human health. Model planar surfaces used in this study include gold which is an electrically conductive surface, mica which is a highly charged, nonconductive surface, and silica. In atmospheric systems, the interaction forces were found to be strongly affected by the relative humidity, and the total adhesion force of a particle onto a surface was modeled as the addition of the capillary, van der Waals, and electrostatic forces. Each component is influenced by the properties of the particle and surface materials, including hydrophobicity and surface roughness, as well as the humidity of the surrounding atmosphere. In aquatic systems, the interaction forces are mainly affected by the solution chemistry, including pH and ionic strength. The main components of the interaction force between a microbial colloidal particle and a planar surface were found to be the van der Waals and electrostatic forces. The results obtained in this research provide insights into the fundamental mechanisms of colloidal particle interactions with environmental surfaces in both atmospheric and aquatic systems, contributing to the understanding of the phenomena driving such interfacial processes as deposition, aggregation, and sedimentation. Thus, the results can help us describe the behavior of contaminant colloidal particles in environmental systems and subsequently devise better means for their removal from environmental surfaces.
Download or read book Colloidal Transport in Porous Media written by Fritz H. Frimmel and published by Springer Science & Business Media. This book was released on 2007-05-26 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the basics of abiotic colloid characterization, of biocolloids and biofilms, the resulting transport phenomena and their engineering aspects. The contributors comprise an international group of leading specialists devoted to colloidal sciences. The contributions include theoretical considerations, results from model experiments, and field studies. The information provided here will benefit students and scientists interested in the analytical, chemical, microbiological, geological and hydrological aspects of material transport in aquatic systems and soils.
Download or read book Environmental Colloids and Particles written by Kevin J. Wilkinson and published by John Wiley & Sons. This book was released on 2007-01-30 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text presents the current knowledge of environmental colloids and includes reviews of the current understanding of structure, role and behaviour of environmental colloids and particles, whilst focussing directly on aquatic systems and soils. In addition, there is substantial critical assessment of the techniques employed for the sampling, size fractionation and characterisation of colloids and particles. Chemical, physical and biological processes and interactions involving colloids are described, and particular attention is paid to quantitative approaches that take account of particle heterogeneity and polydispersity. Presents critical reviews of the state-of-the-art knowledge of environmental colloids Critical assessment of techniques employed for the sampling, size fractionation and characterisation of colloids and particles are given Theoretical and experimental aspects of the methods as well as the required developments and possible recommendations are discussed Each chapter gives a brief introduction general enough for the non-specialist Written by a internationally recognized group of contributors
Download or read book Water Science Reviews 4 Volume 4 written by Felix Franks and published by Cambridge University Press. This book was released on 1989-11-09 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fourth volume of Water Science Reviews presents three fascinating accounts of hydration phenomena in colloidal systems. O.F. Evans and David Miller provide a reappraisal of the role of water in promoting amphiphilic assembly and structure. Donald England's review of water-soluble polymers highlights those areas that show unique solution properties or where there is contention as to the explanation for the behavior. The final review by Kenneth Newman addresses the hydration of surfaces, a topic of profound scientific and technological importance. Post-graduate researchers interested in topical, critical reviews will benefit from this volume.
Download or read book Surface and Colloid Chemistry in Natural Waters and Water Treatment written by R. Beckett and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discipline of surface and colloid chemistIy has experienced a considerable resurgence since the early sixties. This perhaps reflects a growing realisation of the wide applicability of modern colloid and surface theory to many important industrial, medical and environmental problems. This increased activity has resulted in a very complex and at times even confusing area of science being consolidated within a firm theoretical framework. The clearer insights gained into the underlying principles have no doubt acted in an autocatalytic manner to stimulate further interest in an expanding range of applications. A good example in the area of environmental chemistry has been the realization of the important role played by colloidal material and surface interactions in natural biogeochemical processes that has been the subject of increasing attention over the last few decades. This is well illustrated by the numerous studies carried out to elucidate the speciation, toxicity, transport and fate of pollutants in aquatic systems. In the vast majority cases these have clearly implicated some involvement of an aSSOciation between the of pollutant (e. g. trace metal, toxic organic compound or nutrient) and a colloidal component (e. g. particle, humic substance, foam). In order to understand these interactions fully and their effect on pollutant mobility it is important to develop a full appreciation of the surface chemistry of these complex systems. Australian SCientists have long been prominent in the area of colloid and surface chemistry particularly dUring the latter half of this century.
Download or read book A collection of papers presented at the Symposium on Colloidal and Interfacial Phenomena in Aquatic Environments held in Anaheim CA USA 4 6 April 1995 written by Symposium on Colloidal and Interfacial Phenomena in Aquatic Environments and published by . This book was released on 1996 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Colloids in the aquatic environment written by International Symposium on Colloids in the Aquatic Environment (1992, London) and published by . This book was released on 1993 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Micro Nanoplastics in the Aquatic Environment Fate Toxicology and Management written by and published by Elsevier. This book was released on 2024-11 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Micro(nano)plastics in the Aquatic Environment: Fate, Toxicology, and Management Volume 11 explores a wide breadth of chapters, reflecting the experiences of groups of researchers from different countries on essential aspects of the context of plastic pollution. The book provides insights in chapters relating to plastic pollution in the aquatic ecosystems, the behavior of MNPs in the aquatic environment and influencing factors, characteristics of MNPs in the water environment, ecology and MPs, metals and MPs, biofilms and MPs, MNPs pollution in the global mangrove ecosystem, ecotoxicity MPs in amphibian, fishes and snails, and MPs in mariculture.
Download or read book The Role of Colloidal Systems in Environmental Protection written by Monzer Fanun and published by Elsevier. This book was released on 2014-02-08 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Role of Colloidal Systems in Environmental Protection describes the importance of colloids in many applications that contribute to environmental protection, including drinking water and wastewater treatment, heavy metal remediation, treatment of radioactive materials, corrosion, and energy conversion. Knowledge of the physical and chemical composition of colloids is important to understand and accurately model the relevant processes. The book familiarizes the reader with the technological features of the application of colloids in environmental protection, and provides chemical engineers, researchers, and scientists in academic and corporate communities with the latest developments in this field. Each chapter covers the whole spectrum of the relevant science, from the fundamentals to applications. - Provides the applied technological features of colloids in environmental protection - Gives insight into the use of bio-solid colloids as contaminant carriers - Covers the natural occurrence of biosurfactants in the environment and their applications - Provides information on the use of nanoparticles for environmental applications - Chapters written by recognized and respected experts in the field from all over the world
Download or read book Nanoparticles in the Water Cycle written by Fritz H. Frimmel and published by Springer Science & Business Media. This book was released on 2010-07-15 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: As nanotechnology enters everyday life, engineered nanoparticles (ENP) will find their way into nature, including surface and groundwater. Here, distinguished experts of water chemistry present dedicated methods for the analysis of nanoparticles in the aquatic environment, their distribution and fate. This includes the influence of complex matrices such as wastewater, brown water with natural organic matter (NOM), and high salt concentrations as well as available and future standardized methods. The background of geogenic, natural nanoparticles is considered in a discussion of known environmental effects, including strategies to test for potential effects on human and environmental health.
Download or read book Colloid Interactions with a Moving Air water Interface written by Surachet Aramrak and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The disposal of radionuclide wastes to the subsurface environment at Hanford Site has led us to environmental anxiety. It is not only liquid and gas phases that are responsible for contaminant transport in subsurface media, but also the solid phase itself, i.e., subsurface colloids. In the vadose zone, air-water interfaces play key roles in colloid mobilization and transport, but knowledge as to how exactly these interfaces affect colloid transport behavior is still inadequate. This dissertation reports on theoretical and experimental studies of colloid interactions with a moving air-water interface in porous media. The specific objectives of this dissertation were to (1) quantify the effect of advancing and receding air-water interfaces on detachment of colloidal particles from a solid surface, (2) quantify the effect of particle shape on particle detachment from a solid surface by a moving air-water interface, and (3) determine the effect of capillary fringe fluctuations on the behavior of colloidal particles. The major results of this work showed that air-water interfaces play a dominant role in colloid detachment surfaces. Advancing interfaces are more important in removing colloids from a stationary surface than are receding interfaces. Colloid shape affects how air-water interfaces can get pinned and angular particles are significantly better removed by moving air-water interfaces than spherical, smooth particles. These findings also apply to porous media, i.e., capillary fringe phenomena.
Download or read book Role of Interfaces in Environmental Protection written by Sandor Barany and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 581 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NATO Advanced Research Workshop "Role of Interfaces in Environmental Protection" has been held on May 27-30, 2002 in Miskolc, Hungary, under leadership of co-directors Prof Sandor Barany from the University ofMiskolc, Hungary, and Prof Nataliya Klymenko, National Academy of Sciences of Ukraine. The objective of the ARW was to highlight colloidal and biocolloidal aspects of environmental pollution and technologies to monitor, remediate, abate and prevent pollution. It is known that the solution of majority of environmental problems is closely connected with phenomena at the interfaces. The behaviour, transport of dispersed particles in the environment, the main phase separation methods in water treatment, purification of liquids, aerosols removal, many soil remediation processes as well as the methods of protection of human organisms from hazardous matters, are based on concepts of colloid chemistry, i.e. properties of interfaces and their behaviour in different media. Examples of these methods are: filtration, ultrafiltration, flotation, coagulation, hetero-coagulation and flocculation, adsorption, adhesion of micro-organisms to surfaces, membrane separation methods, etc. A very important and special aspect of the topic is the human protection using colloid-chemical approaches, i.e. the adsorption, aggregation and adagulation properties of differe~t materials. Examples are: adsorption of hazardous organic materials, drugs, heavy· metals and radionuclides on activated carbon, silica, cellulose derivatives, etc.
Download or read book Treatise on Water Science written by and published by Newnes. This book was released on 2010-09-01 with total page 2131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water quality and management are of great significance globally, as the demand for clean, potable water far exceeds the availability. Water science research brings together the natural and applied sciences, engineering, chemistry, law and policy, and economics, and the Treatise on Water Science seeks to unite these areas through contributions from a global team of author-experts. The 4-volume set examines topics in depth, with an emphasis on innovative research and technologies for those working in applied areas. Published in partnership with and endorsed by the International Water Association (IWA), demonstrating the authority of the content Editor-in-Chief Peter Wilderer, a Stockholm Water Prize recipient, has assembled a world-class team of volume editors and contributing authors Topics related to water resource management, water quality and supply, and handling of wastewater are treated in depth
Download or read book Water Rock Interaction Two Volume Set written by Richard B. Wanty and published by CRC Press. This book was released on 2004-09-02 with total page 1711 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction of the lithosphere and hydrosphere sets the boundary conditions for life, as water and the nutrients extracted from rocks are essential to all known life-forms. Water-rock interaction also affects the fate and transport of pollutants, mediates the long-term cycling of fluids and metals in the earth's crust, impacts the migration and
