Many impurities in waters and wastewaters are present as colloidal dispersions, i.e. they occur in particulate form within the approximate size range 1 to 10 -3 μm (refer Fig 1.3). Examples of this type of suspension include clays, substances of biological origin such as natural colour, proteins, carbohydrates and their natural or industrial derivatives. Invariably suspensions of this type poss...

Abstract This paper reports new hierarchical cementitious composites developed using microcrystalline cellulose (MCC), sisal fibers and cetyltrimethylammonium bromide (CTAB) as the dispersing agent. MCC was dispersed in water without with CTAB at different concentrations ultrasonication optimum concentration for achieving homogeneous stable suspensions found to be 40%. Hierarchical were fabrica...

Article history: Received 22 February 2016 Received in revised form 1 September 2016 Accepted 7 October 2016 Available online xxxx

Usually, in vivo light absorption spectra of photosynthetic bacteria are obtained by measuring cell suspensions in glass or quartz cuvettes. In such arrangements, however, the scattering of light by the suspensions as well as sedimentation or even swarming behavior of motile cells (N. Pfennig, Arch. Mikrobiol. 42:90, 1962) may give rise to various errors. The error caused by light scattering in...

We report on the high frequency complex permittivity characterization of single-walled carbon nanotubes (SWNT) using broadband and narrowband frequency range techniques. SWNT suspensions, powder and fiber were investigated and the samples were a mixture of semiconducting and metallic nanotubes. Shielded opencircuited coaxial probe (50 MHz to 10 GHz) and dielectric microwave resonators were deve...

Pulp fibers have a strong tendency to form flocs in water suspensions, which may cause their undesirable distribution in the paper sheets. This flocculation can be controlled by adding, e.g., an anionic high molecular weight polyelectrolyte in the fiber suspension. The objective of this study was to investigate the effect of anionic polyelectrolytes on deflocculation kinetics, dewatering, and r...

We report an automated microfluidic platform for 'digitally' screening the composition space of droplets containing cocktails of small molecules and demonstrate the features of this system by studying epistatic interactions between antibiotics and Escherichia coli ATCC 25922. This system has several key characteristics: (i) it uses small (<100 μL) samples of liquids and suspensions of bacteria ...

Significant technological advances of the last years have been possible by developments in Optofluidics, which is a field that deals with the integration of optics and microfluidics into single devices. The work described in this thesis is based on five scientific publications related to the use of fiber optic technology to build integrated optofluidic devices. The first three publications are ...