Many landslides occur in Samigaluh District, Kulon Progo Regency, Yogyakarta, Indonesia. However, no research discusses that often on the main road connecting city of Yogyakarta and various tourist resorts Samigaluh. This study aims at determining soil vulnerability lithology model as a contribution to landslide mitigation planning. is based shear wave velocity (Vs) layer thickness derived by m...

Arsenic (As) contaminated aquifers contain iron minerals and clays that strongly bind As at their surfaces. It was suggested that As mobilization is driven by natural organic matter (including fulvic acids (FA) and humic acids (HA)) present in the aquifers either via providing reducing equivalents for reductive dissolution of Fe(III) (hydr)oxides or via competitive desorption of As from the min...

Slow release formulations of the anionic herbicide sulfosulfuron (SFS) were prepared by incorporating it in micelles of an organic cation octadecyltrimethylammonium, which adsorb on the clay-mineral montmorillonite. The fraction of SFS adsorbed on the micelle-clay complex reached 98%, whereas for monomer-clay complexes, its adsorption was insignificant. Fluorescence studies showed surface conta...

Detailed geological mapping contributed towards the tectonic framework of the Kala Chitta Range for the purpose of a compressive knowledge of the mode of occurrence of the Fire Clay horizons in the Datta Formation .Furthermore, detailed analytical work was carried out to elucidate the mineralogy of the Fire Clays. Lithological details and the depositional style have been highlighted comparative...

We report on the synthesis, microstructure and mass transport properties of a colloidal hydrogel self-assembled from a mixture of colloidal silica and nontronite clay plates at different particle concentrations. The gel-structure had uniaxial long-range anisotropy caused by alignment of the clay particles in a strong external magnetic field. After gelation the colloidal silica covered the clay ...

QIAN ZHAO: CO2-mediated formation of polymer/clay nanocomposites (Under the direction of Edward T. Samulski) In this thesis, the feasibility of scCO2 as both a processing medium and a polymerization medium for preparation of polymer/clay nanocomposites has been explored, with the first part discussing a CO2-mediated intercalation of poly(ethylene oxide) (PEO) in clay. It has been shown that CO2...

Isolated Escherichia coli K-12 cell envelopes or Bacillus subtilis 168 cell walls were reacted with smectite or kaolinite clay in distilled deionized water (pH 6.0); unbound envelopes or walls were separated by sucrose density gradient centrifugation, and the extent of adsorption was calculated. At saturation, both clays adsorbed approximately 1.0 mg (dry weight) of envelopes or walls per mg (d...

A bench work study was carried out to investigate the use of kaolinitic clay containing 29.4% Al2O3 extremely abundant in Saudi Arabia for the production of pure alumina by calcination at 700 o C for 1h (recommended by previous investigators) then leached by hydrochloric acid. The effects of leaching temperature (25 o C to boiling temperature), period of activation (10-150 minutes), acid concen...