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Publication Metadata only Improvement of dispersion and stability of fine titanium dioxides in silicone fluid using poly(ethylene oxide-b-dimethylsiloxane-b-ethylene oxide) triblock copolymer: Effects of the dispersant structure and concentration(2013-11-06) Nisanart Traiphol; Surachet Toommee; Metha Rutnakornpituk; Rakchart Traiphol; Supatra Jinawath; Chulalongkorn University; Naresuan University; Mahidol UniversitySuspensions of fine titanium dioxides were prepared in silicone fluid using newly synthesized poly(ethylene oxide-bdimethylsiloxane- b-ethylene oxide) triblock copolymers as dispersants. The block length of the copolymers is systematically modified... to allow fine tuning of the interfacial interaction between titanium dioxide particles and the silicone medium. The properties of the suspension including its rheological behavior, sedimentation rate, particle size distribution, and particle dispersion werePublication Metadata only Improvement of dispersion state and charge separation efficiency of hybrid films of ZnO nanoparticle/conjugated polymers by utilizing methanol as a volatile dispersant(2012-02-01) Tanita Hirunprateep; Nisanart Traiphol; Ruttayapon Potai; Rakchart Traiphol; Chulalongkorn University; Naresuan University; Mahidol UniversityThis contribution introduces an efficient method for fabricating hybrid films of ZnO nanoparticle/conjugated polymers with improved charge separation efficiency. Methanol is utilized as a volatile dispersant for promoting the dispersion of Zn...O nanoparticles in chlorobenzene. The increase of methanol concentration from 0 to 20% (v/v) results in systematic improvement of the particle dispersion. The suspensions of ZnO nanoparticles in these solvents are used to prepare hybrid films of poly[2-methoxy-5Publication Metadata only Physicochemical properties of ursodeoxycholic acid dispersed in controlled pore glass(1999-08-15) Siriporn Okonogi; Toshio Oguchi; Etsuo Yonemochi; Satit Puttipipatkhachorn; Keiji Yamamoto; Chiang Mai University; Chiba University; Mahidol UniversityThe objective of this study was to reduce the crystallinity of ursodeoxycholic acid (UDCA) by solid dispersion with controlled pore glass (CPG). To evaluate the effect of pore diameter and pore volume of CPG on the crystalline properties of UDCA, we... solid dispersion with CPG obtained by a solvent method. The DSC thermograms of solid dispersions showed that there were two states of UDCA, amorphous and crystalline. The amount of crystalline fraction in the solid dispersions depended on the pore sizePublication Metadata only A Comparison Study of Magnetic Stirrer and Sonicator Technique to Disperse 1% Span20 Treated Layered Double Hydroxides (LDHs)(2019-10-28) S. Teanmetawong; T. Chantaramanee; S. Lhosupasirirat; A. Wongariyakawee; T. Srikhirin; SCG Chemicals Co., Ltd.; Mahidol University© Published under licence by IOP Publishing Ltd. Effect of particle size reduction and dispersion of 2-dimensional material, layered double hydroxide (LDHs), prepared by co-precipitation method with the primary particle size of around 100 nm..., was investigated. Two simple laboratory dispersing techniques including magnetic stirrer, and sonicator were applied to disperse agglomerated LDHs in 1 wt.% Span20 solution, act as a stabilizer. Magnetic stirrer showed a cluster of agglomerate particlesPublication Metadata only Relationships among blending conditions, size of dispersed phase, and oil resistance in natural rubber and nitrile rubber blends(2001-10-31) Chakrit Sirisinha; Sauvarop Baulek-Limcharoen; Jarunee Thunyarittikorn; Mahidol University; The Institute of Science and Technology for Research and Development, Mahidol Universitystrongly on the blending time than the rotor speed. The size of the NR dispersed phase is approximately independent of the rotor speed, but it decreases with increasing blending time up to 25 min. With a further increase in the blending time the NR... dispersed phase size decreases. The results for the relative tensile strength, which is an indicator of oil resistance, are in agreement with those of the blend morphology, indicating that the oil resistance in a 20/80 NR/NBR blend strongly dependsItem Metadata only A facile and green pre-dispersion method for the preparation of epoxide-functionalized natural rubber/silica nanocomposites with improved mechanical properties(2024-01-01) Abdulraman D.; Tiensing T.; Phinyocheep P.; Abdulraman D.; Mahidol UniversityGood dispersion of silica filler in the rubber matrix is a key factor for the high-performance properties of rubber/silica nanocomposites. This work aimed at using mild and green conditions for incorporating high silica content in natural rubber (NR...) without using a silane coupling agent. The NR latex was modified into a low degree (5%) of epoxide-functionalized NR, symbolized as ENR5 by epoxidation reaction. The silica (40 phr) was pre-dispersed in water using ultrasonication to break down the silicaPublication Metadata only Dispersion enhancement of multi-walled carbon nanotubes in nitrile rubber(2014-01-01) A. Boonbumrung; P. Sae-Oui; C. Sirisinha; Mahidol University; Thailand National Metal and Materials Technology CenterA study of reinforcement mechanism of multi-walled carbon nanotubes (MWCNT) in nitrile rubber (NBR) matrix was carried out. Attempts to enhance the dispersion degree of MWCNT and the NBR-MWCNT interaction were conducted using numerous approaches... and electrical properties. With MWCNT modification, a significant reduction in the state-of-mix of MWCNT composites is exhibited. SEM results demonstrate the highest magnitude of MWCNT dispersion in the system with HNO3, but relatively poor interaction with NBRPublication Metadata only Multi-stage ring resonator all-pass filters for dispersion compensation(2009-07-27) Chinda Chaichuay; Preecha P. Yupapin; Prajak Saeung; King Mongkut's Institute of Technology Ladkrabang; Mahidol Universitylarger bandwidth over the dispersion can be obtained. This device is able to provide dispersion compensation to systems such as the high speed dense wavelength division multiplexer (DWDM) for the optical fiber communication system.Item Metadata only Green composite sponge of natural rubber reinforced with cellulose filler using alginate as a dispersing agent(2023-11-01) Suppanucroa N.; Nimpaiboon A.; Boonchuay K.; Khamkeaw A.; Phisalaphong M.; Mahidol UniversityComposite sponges of natural rubber and cellulose fiber (NR-C) using sodium alginate (SA) as a dispersing agent were successfully fabricated by the Dunlop process. The aim of this work was to develop a green composite NR-C sponge with high... mechanical properties and efficient water absorption capacity (WAC). The addition of SA could promote cellulose fiber dispersion in NR matrix and NR-cellulose interactions; accordingly, it resulted in highly macro-porous sponges with improved mechanicalPublication Metadata only Improved hardness of nanocomposite films on PMMA sheet using beadmilled-SiO2nanoparticle in dowanol PM(2018-01-01) Siraprapa Lhosupasirirat; Taksorn Jirathampradhab; Nuttawee Niamsiri; Tanakorn Osotchan; Mahidol University© 2018 Trans Tech Publications, Switzerland. The main objective of this study was to prepare bead milled-silica nanoparticles (SiO2) as reinforcing materials for transparent hard coating films. SiO2dispersed in Dowanol PM without any stabilizer... was used as a main component in the nanocomposite hard coating films to improve hardness of Poly methyl methacrylate (PMMA) sheets. However, the major challenge in hard coating formulation is the dispersion of nanoscale SiO2particles. Bead milling machine