TH – Page 5 – TechConnect Briefs

Detection of Plant Cell Compartments and Changes in Cell Dielectric due to Arsenic Absorption via Traveling Wave Dielectrophoresis

Bunthawin S., Wanichapichart P., Tuantranont A., Membrane Science and Technology Research Center, TH

This study determined changes in cell dielectric properties due to variation of arsenic concentration of the cell suspending medium, from 1 to 150 ppm. An octa-pairs interdigitated electrode was used to induce dielectrophoresis, and the [...]

Chitosan-Nanoparticle as UV Filter and Carrier for Cosmetic Actives

Wanichwecharungruang S.P., Assoc. Prof., TH

Chitosan derivative was prepared by grafting both phthaloyl groups and methoxy poly(ethylene glycol) moieties onto the polymer chain. Nanoparticles of the prepared chitosan derivative were then obtained through solvent displacement technique. The products are stable [...]

Formation of Nano CoFe2O4 Crystallites in Hydroxyapatite

Pon-On W., Tang I.M., Mahidol University, TH

Embedding nano size CoFe2O4 ferrite particles in a hydroxyapatite (HAP) host would make them to better candidates for hyperthermia treatment of cancer. The formation of nano crystallites of CoFe2O4 ferrites in the hydroxyapatite Ca10-3xFe2xCox(PO4)6(OH)2 (where [...]

Polypyrrole-Organoclay Nanocomposites for Gas Sensors

Magaraphan R., Thuimthad A., Chulalongkorn University, TH

Polypyrrole (PPy) was synthesized in the presence of octadecylammonium-montmorillonite (OC-MMT) 1-9 wt% using ferric chloride as an initiator to result the intercalated nanocomposites. The synthesized PPy and its nanocomposites were tested for volatile organic gases; [...]

Conduction Properties of BN-doped Fullerene Chain Obtained by Density Functional Calculations

Krainara N., Luksirikul P., Sirijaraensre J., Pantu P., Limtrakul J., Kasetsart University, TH

Carbon-based molecules such as fullerenes and carbon nanotubes, have attracted the attention of researchers because of their unique mechanical, and electronic properties and potential applications in a wide variety of areas of nanotechnology. The substitution [...]

Adsorption of glycine and phenylalanine in H-ZSM-5 zeolite: an embedded QM/MM study

Boekfa B., Sirijaraensre J., Limtrakul J., Limtrakul P., Pantu P., Limtrakul J., Limtrakul P., Kasetsart University, TH

Zeolites are crystalline aluminosilicate microporous materials whose pore diameters are in the range of 2 to 10 Å. Zeolites have numerous important applications in catalysis, adsorption, drug delivery, and chemical separations. Recently, zeolites have received [...]

Structure and Electronic Properties of “DNA-Gold-Nanotube” Systems: A Quantum Chemical Analysis

Pannopard P., Sirijaraensre J., Nokbin S., Khongpracha P., Limtrakul J., Kasetsart University, TH

The idea of chemical sensing based on molecular recognition is known as one of the most promising concepts for single-molecule detection, even though it still remains in an early developmental stage. The approach requires probes [...]

Theoretical Studies on the Ozonization at the Capped-end of a Single-walled Carbon Nanotube: The Effect of the Finite Length

Sawangphruk M., Sirijaraensre J., Pantu P., Limtrakul J., Kasetsart University, TH

Since the discovery in 1991, single-walled carbon nanotubes (SWNTs) have been investigated for numerous potential applications in nanotechnology. However, the insolubility and high chemical stability obstruct the purification and the applications of the nanotubes. The [...]

Layer-by-Layer Deposition of Chitosan/Polydiacetylene Vesicles for Convenient Preparation of Colorimetric Sensing Film

Potisatityuenyong A., Dubas S.T., Sukwattanasinitt M., Chulalongkorn University, TH

The aim of this report is to present a method for preparation of multilayer films for colorimetric sensor from PDA vesicles using the PEM technique, that the change of its color is also observable visually. [...]

Micromachined Piezoresistive Tactile Sensor Array Fabricated by Bulk-etched MUMPs Process

Tuantranont A., Lomas T., Bright V.M., National Electronics and Computer Technology Center (NECTEC), TH

This paper discusses the design, fabrication and testing of a 5x5 micromachined tactile sensor array for the detection of an extremely small force (micrometer-Newton range). Central contacting pads that are trampoline-shape suspended structures and sensor [...]