Application of novel composite materials as sediment capping agents: column experiments and modelling

2019 ◽  
Vol 170 ◽  
pp. 111-118 ◽  
Author(s):  
Miltiadis Zamparas ◽  
Grigorios L. Kyriakopoulos ◽  
Vasilis C. Kapsalis ◽  
Marios Drosos ◽  
Ioannis K. Kalavrouziotis
Keyword(s):  
Composite Materials ◽  
Column Experiments ◽  
Capping Agents ◽  
Sediment Capping

Fluxes of nutrients and trace metals across the sediment-water interface controlled by sediment-capping agents: bentonite and sand

2016 ◽  
Vol 188 (10) ◽  
Author(s):  
Junho Han ◽  
Hee-Myong Ro ◽  
Kyung Hwa Cho ◽  
Kyoung-Woong Kim
Keyword(s):  
Trace Metals ◽  
Water Interface ◽  
Capping Agents ◽  
Sediment Capping

The application of sediment capping agents on phosphorus speciation and mobility in a sub-tropical dunal lake

2004 ◽  
Vol 55 (7) ◽  
pp. 715 ◽  
Author(s):  
Darren Akhurst ◽  
Graham B. Jones ◽  
David M. McConchie
Keyword(s):  
Sediment Cores ◽  
Waste Product ◽  
Bentonite Clay ◽  
Speciation Analysis ◽  
Available P ◽  
Phosphorus Speciation ◽  
Overlying Water ◽  
Capping Agents ◽  
Sediment Capping ◽  
Plant Available P

Experimental sediment cores from Lake Ainsworth, Australia, were exposed to an induced 46-day, anoxic/oxic cycle in the laboratory, mimicking the seasonal thermal stratification cycle commonly observed in the lake’s waters every summer. Under oxic conditions the supply of phosphorus (P) and iron (Fe) to the overlying water was slow, however, induced anoxia led to an enhanced release of P and Fe from the sediments to the water column. An inverse relationship between total P, Fe and redox potential suggests that Lake Ainsworth sediments are redox sensitive. Phosphorus speciation analysis of Lake Ainsworth sediments revealed the presence of a large pool of organic P, reactive Fe-bound P, and CaCO3-bound P, the latter fraction decreasing during anoxic conditions. Two sediment-capping agents, a lanthanum modified bentonite clay and Bauxsol (a waste product from the aluminium smelting industry) were assessed for their ability to reduce the levels of P released from Lake Ainsworth sediments during the 46-day, anoxic/oxic cycle. The bentonite clay was highly effective at reducing plant available P in anoxic/oxic conditions, but levels of dissolved Fe were enhanced with its use. Although the use of Bauxsol to remove plant available P is not recommended in anoxic waters, its use in suspension in oxic waters warrants further study.

Comparative Microstructures of Ion Milled and Electrochemically Thinned Composite Materials

1974 ◽  
Vol 32 ◽  
pp. 546-547
Author(s):  
R.R. Russell
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Composite Materials ◽  
Great Difficulty ◽  
Ion Milling ◽  
Transmission Electron ◽  
Ion Damage ◽  
Intermetallic Composite

Transmission electron microscopy of metallic/intermetallic composite materials is most challenging since the microscopist typically has great difficulty preparing specimens with uniform electron thin areas in adjacent phases. The application of ion milling for thinning foils from such materials has been quite effective. Although composite specimens prepared by ion milling have yielded much microstructural information, this technique has some inherent drawbacks such as the possible generation of ion damage near sample surfaces.

Transmission electron microscopy of composite materials

1988 ◽  
Vol 46 ◽  
pp. 1012-1015
Author(s):  
K.P.D. Lagerlof
Keyword(s):  
Composite Materials ◽  
Physical Properties ◽  
Structural Defects ◽  
Structural Composites ◽  
Multiphase Materials ◽  
Structural Reinforcement ◽  
Transmission Electron ◽  
Reinforced Fiber ◽  
Particulate Reinforced Composites ◽  
Definition Of

Although most materials contain more than one phase, and thus are multiphase materials, the definition of composite materials is commonly used to describe those materials containing more than one phase deliberately added to obtain certain desired physical properties. Composite materials are often classified according to their application, i.e. structural composites and electronic composites, but may also be classified according to the type of compounds making up the composite, i.e. metal/ceramic, ceramic/ceramie and metal/semiconductor composites. For structural composites it is also common to refer to the type of structural reinforcement; whisker-reinforced, fiber-reinforced, or particulate reinforced composites [1-4].For all types of composite materials, it is of fundamental importance to understand the relationship between the microstructure and the observed physical properties, and it is therefore vital to properly characterize the microstructure. The interfaces separating the different phases comprising the composite are of particular interest to understand. In structural composites the interface is often the weakest part, where fracture will nucleate, and in electronic composites structural defects at or near the interface will affect the critical electronic properties.

Composite materials: Radar shields

Nature China ◽  
2007 ◽  
Author(s):  
Tim Reid
Keyword(s):  
Composite Materials

Composite materials: Flexible ferroelectrics

Nature China ◽  
2009 ◽  
Author(s):  
Tim Reid
Keyword(s):  
Composite Materials

Detecting Discontinuities in Polymer Composite Materials and Multilayer Glued Structures

2020 ◽  
Vol 78 (8) ◽  
pp. 914-923
Author(s):  
Victor Murashov
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials

FSUE "VIAM" solvent-free binders for polymer composite materials

2016 ◽  
Vol 2 (2) ◽  
pp. 37-42 ◽  
Author(s):  
E. N. Kablov ◽  
L. V. Chursova ◽  
A. N. Babin ◽  
R. R. Mukhametov ◽  
N. N. Panina
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Solvent Free ◽  
Polymer Composite Materials
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