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Publication Metadata only Effect of acid during synthesis on the agglomerated strength of TiO 2 nanoparticles(2009-10-26) Sarayut Termnak; Wannapong Triampo; Darapond Triampo; Mahidol Universityhydrochloric acid was added during the synthesis. With no acid, both anatase and brookite structures were formed. Transmission electron microscopy (TEM) showed that the primary particles from both the acid and no-acid routes were of approximately the same size.... A particle-size analyzer equipped with an ultrasonic generator showed, however, that the aggregates of acid NPs were more difficult to break apart than those of the no-acid NPs. Gel formation was used to explain the difference in strength by whichPublication Metadata only Chemical force mapping of phosphate and carbon on acid-modified tapioca starch surface(2009-01-01) Karntarat Wuttisela; Wannapong Triampo; Darapond Triampo; Mahidol University; Center of Excellence for Vectors and Vector-Borne Diseases; Center of Excellence for Innovation in ChemistrySurface chemical microstructure of hydrochloric acid hydrolyzed tapioca starch producing different amylose:amylopectin (Am:Ap) ratios were studied with scanning chemical force microscopy (CFM). The chemical force probes were functionalized of two... types with -OH (phosphate specific) and -CH3(carbon specific). Lateral force trace-minus-retrace (TMR) images from -OH and -CH3probes revealed changes in the phosphate domains and the carbon backbone for the varying acid hydrolyzed tapioca starch