| 1. |
- Pai, Ranjith Krishna, et al.
(författare)
-
Divalent cation-induced variations in polyelectrolyte conformation and controlling calcite morphologies : Direct observation of the phase transition by atomic force microscopy
- 2008
-
Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 0002-7863 .- 1520-5126. ; 130:39, s. 13074-13078
-
Tidskriftsartikel (refereegranskat)abstract
- In the biomineralization process, the changes in conformation of organic matrix may be a widespread phenomenon. Investigation of the structural relationship between organic and inorganic materials is the main subject. The approach taken was to extract quantitative information of the variations in polyelectrolyte conformation during the mineralization process using atomic force microscopy. The results inter the evidence of the role of polyelectrolyte conformation in mineralization of calcium carbonate and the methods for understanding the principle that govern biomineralization.
|
|
| 2. |
- Pai, Ranjith Krishna, et al.
(författare)
-
Nanoparticles of amorphous calcium carbonate by miniemulsion : synthesis and mechanism
- 2008
-
Ingår i: CrystEngComm. - : Royal Society of Chemistry (RSC). - 1466-8033. ; 10:7, s. 865-872
-
Tidskriftsartikel (refereegranskat)abstract
- The main objective of the present study is to develop a system to synthesize stable amorphous calcium carbonate (ACC) particles with controlled particle size in the range of nanometers by the use of miniemulsion technique and to understand the 'facilitated transport mechanism'. The surfactant adsorption can be explained by the change in solubility of CaCO3 and surfactant in aqueous solution. This article covers our experimental observations and the possible reaction mechanisms.
|
|
| 3. |
- Pai, Ranjith Krishna, et al.
(författare)
-
Temperature induced formation of strong gels of acrylamide-based polyelectrolyte
- 2009
-
Ingår i: Journal of Colloid and Interface Science. - 0021-9797 .- 1095-7103. ; 337, s. 46-53
-
Tidskriftsartikel (refereegranskat)abstract
- Very strong physical gels have been formed by moderate temperature increases in aqueous dispersions of acrylamide-based beads and dissolved polymeric molecules. Rheometry, confocal laser scanning microscopy, and differential scanning calorimetric studies of acrylamide-based copolymers with acrylic acid, [Poly(AM-co-AA)], and 2-acrylamido-2-methylpropane acid, [Poly(AM-co-NaAMPS)], suggest that the temperature induced swelling of the polymer beads and chains, create strongly entangled polymer networks, above the upper critical solution temperature. Analyses of the viscoelastic response showed that the time-scale for the gelation process is about minutes to hours. The addition of high concentrations of Ca2+ resulted in a significant decrease in the gel strength
|
|
| 4. |
- Pillai, Saju, et al.
(författare)
-
Effect of lateral morphology formation of polymer blend towards patterning silane-based SAMs using selective dissolution method
- 2008
-
Ingår i: Ultramicroscopy. - : Elsevier BV. - 0304-3991 .- 1879-2723. ; 108:5, s. 458-464
-
Tidskriftsartikel (refereegranskat)abstract
- A number of strategies have been developed including soft lithography and photolithography for patterning various surfaces. Here we have discussed a customized strategy for surface patterning of nanosized, silane-based SAMs and monolayer thickness measurement investigated using atomic force microscope (AFM). We have utilized the versatile morphology of a binary polymer blend to generate patterned SAMs over silicon substrate by employing a selective dissolution procedure. This method was confirmed with different organosilanes with varying number of C-atoms and to other polymer blend. The samples were imaged both in tapping mode and pulsed force mode AFM.
|
|
