title: Selective adsorption and release of cationic organic dye molecules on mesoporous borosilicates.
abstract: Mesoporous materials can play a pivotal role as a host material for delivery application to a specific part of a system. In this work we explore the selective adsorption and release of cationic organic dye molecules such as safranine T (ST) and malachite green (MG) on mesoporous borosilicate materials. The mesoporous silica SBA-15 and borosilicate materials (MBS) were prepared using non-ionic surfactant Pluronic P123 as template via evaporation induced self-assembly (EISA) method. After template removal the materials show high surface areas and in some cases ordered mesopores of dimensions ca. 6-7 nm. High surface area, mesoporosity and the presence of heteroatom (boron) help this mesoporous borosilicate material to adsorb high amount of cationic dye molecules at its surface from the respective aqueous solutions. Furthermore, the mesoporous borosilicate samples containing higher percentage adsorbed dyes show excellent release of ST or MG dye in simulated body fluid (SBF) solution at physiological pH=7.4 and temperature 310 K. The adsorption and release efficiency of mesoporous borosilicate samples are compared with reference boron-free mesoporous pure silica material to understand the nature of adsorbate-adsorbent interaction at the surfaces.
authors.forename: Manidipa
authors.initials: M
authors.lastname: Paul
authors.forename: Nabanita
authors.initials: N
authors.lastname: Pal
authors.forename: Asim
authors.initials: A
authors.lastname: Bhaumik
mesh_terms: D000327:Adsorption; D001826:Body Fluids / Q000737:chemistry; D002412:Cations / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010619:Phenazines / Q000737:chemistry; D011060:Poloxalene / Q000737:chemistry; D016062:Porosity; D012394:Rosaniline Dyes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D002412:Cations; D004396:Coloring Agents; D010619:Phenazines; D012394:Rosaniline Dyes; C509969:SBA-15; D012996:Solutions; D013501:Surface-Active Agents; D014867:Water; C005095:malachite green; C464484:pluronic block copolymer P123; D012822:Silicon Dioxide; D011060:Poloxalene; C009195:safranine T