Destabilization of montmorillonite suspensions by Ca2+ and succinoglycan

Clay Minerals ◽  
2003 ◽  
Vol 38 (2) ◽  
pp. 173-185 ◽  
Author(s):  
J . Labille ◽  
F. Thomas ◽  
I . Bihannic ◽  
C. Santaella
Keyword(s):  
Tensile Strength ◽  
Confocal Microscopy ◽  
Laser Diffraction ◽  
Time Resolved ◽  
Clay Particles ◽  
Bridging Flocculation ◽  
Colloidal Clay

AbstractAggregation of colloidal clay particles (Na-montmorillonite) by CaCl2 and anionic polysaccharide (succinoglycan) in turbulent conditions was investigated using time-resolved size measurements by laser diffraction on diluted (50 mg l –1) and stirred suspensions. Excess of Ca2+ ions promotes coagulation of the clay, reducing interparticle repulsions, and allows adsorption of succinoglycan, inducing bridging flocculation. Growth/breakage cycles, characteristic of the turbulent conditions, cause the macromolecules to be incorporated in the innermost of the flocs, where the morphological units are shown by confocal microscopy to be the micrometric Ca-clay particles. Such incorporation results in an increased floc tensile strength, depending on the amount of macromolecules adsorbed, with a maximum at polysaccharide concentrations of 2 wt.% with respect to clay mass.

Formulation and Evaluation of Chitosan-Polyaniline Nanocomposites for Controlled Release of Anticancer Drug Doxorubicin

2018 ◽  
Vol 8 (2) ◽  
Author(s):  
Dillip Kumar Behera ◽  
Kampal Mishra ◽  
Padmolochan Nayak
Keyword(s):  
Tensile Strength ◽  
Drug Release ◽  
Nanocomposite Films ◽  
Casting Method ◽  
Sustained Drug Release ◽  
In Vitro Drug Release ◽  
Clay Particles ◽  
Solution Casting Method ◽  
Nanoclay Content

In this present work, chitosan (CS) crosslink with polyaniline (PANI) with montmorilonite (MMT) called as (CSPANI/MMT) and CS crosslink with PANI without MMT called as (CS-PANI) were prepared by employing the solution casting method. Further the formation of nanocomposites CS-PANI/MMT and CS-PANI were investigated using XRD, FTIR, SEM and tensile strength. Water uptake and swelling ratio of the CS-PANI and CS-PANI/MMT were found to decrease with increase in concentration of clay. Mechanical properties of the CS-PANI and CS-PANI/MMT were assessed in terms of tensile strength and extensibility using texture analyzer. Increase in tensile strength and reduction in extensibility was reported with increase in the nanoclay content. In vitro drug release study on CS-PANI and CS-PANI/MMT indicated pronounced sustained release of doxorubicin by the incorporation of clay particles in the CS polymer matrix. Overall CSPANI/MMT nanocomposite films exhibited improved mechanical and sustained drug release properties than CS-PANI.

scholarly journals Spectral Imaging of Single CdSe/ZnS Quantum Dots Employing Spectrally- and Time-resolved Confocal Microscopy

2002 ◽  
pp. 317-335 ◽  
Author(s):  
W. G. J. H. M. Van Sark ◽  
P. L. T. M. Frederix ◽  
M. A. H. Asselbergs ◽  
D. J. Van den Heuvel ◽  
A. Meijerink ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Confocal Microscopy ◽  
Spectral Imaging ◽  
Time Resolved

scholarly journals Surface and interfacial tensions of aqueous dispersions of charged colloidal (clay) particles

1994 ◽  
Vol 72 (9) ◽  
pp. 1915-1920 ◽  
Author(s):  
Laurier L. Schramm ◽  
Loren G. Hepler
Keyword(s):  
Interfacial Tension ◽  
Pure Water ◽  
Surface Tensions ◽  
Flow Rates ◽  
Aqueous Dispersions ◽  
Clay Particles ◽  
Interfacial Tensions ◽  
Aqueous Suspensions ◽  
Colloidal Clay ◽  
Effect Of Surface

We have measured (du Nouy ring and maximum bubble pressure methods) suspension–air surface tensions of aqueous suspensions of montmorillonite and have observed that these surface tensions are larger than those of pure water at the same temperatures. Further measurements have shown that dispersed montmorillonite also increases the suspension–toluene interfacial tension compared with that of pure water–toluene. Similar measurements on aqueous suspensions of kaolinite have yielded suspension–air interfacial tensions with uncertainties as large as the observed (small) effect, and also shown that the suspension–toluene interfacial tension is decreased (opposite to the effect of montmorillonite) by amounts larger than the experimental uncertainties. Measurements of maximum bubble pressures at different flow rates have provided information about the effect of surface age on observed surface tensions.

Comparison of soil texture determined by two dispersion units of Mastersizer 2000

2012 ◽  
Vol 26 (1) ◽  
pp. 99-102 ◽  
Author(s):  
A. Sochan ◽  
A. Bieganowski ◽  
M. Ryżak ◽  
R. Dobrowolski ◽  
P. Bartmiński
Keyword(s):  
Particle Size ◽  
Soil Texture ◽  
Clay Fraction ◽  
Laser Diffraction ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Clay Particles ◽  
Fine Clay

Comparison of soil texture determined by two dispersion units of Mastersizer 2000The comparison of particle size distributions measured by sedimentation methods and laser diffraction shows the underestimation of the fine (clay) fraction. This is attributed mainly to the shape of clay particles being different than spherical. The objective of this study was to demonstrate differences in the results of particle size distributions of soils determined with the method of laser diffraction using two different dispersion units of the Malvern Mastersizer 2000.

Tensile Properties of Clay/Polypropylene Nanocomposites at Cryogenic Temperature

2012 ◽  
Vol 488-489 ◽  
pp. 562-566
Author(s):  
S. Mohammad Reza Khalili ◽  
Neda Soleimani ◽  
Reza Eslami Farsani ◽  
Ziba Hedayatnasab
Keyword(s):  
Tensile Strength ◽  
Maleic Anhydride ◽  
Tensile Properties ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Melt Mixing ◽  
Clay Particles ◽  
Polypropylene Nanocomposites ◽  
Pp Composites ◽  
Compatibilizing Agent

In this paper, the polypropylene (PP)nanocomposites containing 1, 3 and 5 wt % of nanoclay particles are prepared via direct melt mixing in the presence of maleic anhydride grafted PP (PP-g-MA) as compatibilizing agent. PP-g-MA is known to facilitate the dispersion of clay particles in a nonpolar PP matrix and to increase the adhesion between PP and the clay particles.The effect of different nanoclay contents on the PP composites are investigated for tensile characterization at both room temperature(RT) and cryogenic temperature (CT).The results showed that the cryogenic tensile strength, Young’s modulus, percentage of displacement at break and the energy absorptionat cryogenic temperature are all enhanced ascompared to the neat PP by the addition of clay at appropriate contents

Dynamics in Cytoplasm, Nucleus, and Lipid Droplet of a Live CHO Cell: Time-Resolved Confocal Microscopy

Langmuir ◽  
2013 ◽  
Vol 29 (25) ◽  
pp. 7975-7982 ◽  
Author(s):  
Shirsendu Ghosh ◽  
Shyamtanu Chattoraj ◽  
Tridib Mondal ◽  
Kankan Bhattacharyya
Keyword(s):  
Confocal Microscopy ◽  
Lipid Droplet ◽  
Cho Cell ◽  
Time Resolved

Time-resolved confocal microscopy of cryogenic processes in biological tissues

2011 ◽  
Author(s):  
M. Schellenberg ◽  
T. Bergmann ◽  
E. Peev ◽  
M. Kloster ◽  
J. Napier ◽  
...  
Keyword(s):  
Confocal Microscopy ◽  
Biological Tissues ◽  
Time Resolved ◽  
Cryogenic Processes

scholarly journals Fluorescence Dynamics in the Endoplasmic Reticulum of a Live Cell: Time-Resolved Confocal Microscopy

ChemPhysChem ◽  
2016 ◽  
Vol 17 (18) ◽  
pp. 2777-2777
Author(s):  
Shirsendu Ghosh ◽  
Somen Nandi ◽  
Catherine Ghosh ◽  
Kankan Bhattacharyya
Keyword(s):  
Endoplasmic Reticulum ◽  
Confocal Microscopy ◽  
Live Cell ◽  
Time Resolved

Size Reduction of Clay Particles in Nanometer Dimensions

2002 ◽  
Vol 740 ◽  
Author(s):  
Gopinath Mani ◽  
Qinguo Fan ◽  
Samuel C. Ugbolue ◽  
Isabelle M. Eiff
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Specific Surface ◽  
Size Distribution ◽  
Research Work ◽  
Particle Size Analysis ◽  
Laser Diffraction ◽  
Size Analysis ◽  
Clay Particles ◽  
Nano Size

ABSTRACTThis research work focuses on combining ball milling and ultrasonication to produce nano-size clay particles. Our work also emphasizes on increasing the specific surface area of montmorillonite clay particles by reducing the particle size to nanometer dimensions. We have characterized the as-received clay particles by using particle size analysis based on laser diffraction and found that the size of the clay particles is not consistent and the particle size distribution is very broad. However, after the unique treatment and processing, the clay particles were obtained in nanometer dimensions with narrowed particle size distribution.

scholarly journals Time-resolved confocal microscopy using lanthanide centred near-IR emission

RSC Advances ◽  
2015 ◽  
Vol 5 (86) ◽  
pp. 70282-70286 ◽  
Author(s):  
Zhiyu Liao ◽  
Manuel Tropiano ◽  
Stephen Faulkner ◽  
Tom Vosch ◽  
Thomas Just Sørensen
Keyword(s):  
Confocal Microscopy ◽  
Arrival Time ◽  
Silica Particles ◽  
Luminescence Lifetime ◽  
High Contrast ◽  
Time Resolved ◽  
Near Ir ◽  
Nir Imaging ◽  
Fast Acquisition ◽  
Ir Emission

Time-resolved NIR imaging of lanthanide coated silica particles using Photon Arrival Time Imaging allows fast acquisition of high contrast images based on the probe luminescence lifetime.

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