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Chapter 8 Hydrothermal Precipitation of β-FeOOH Nanoparticles in Mixed Water/Alcohol Solvent Mahabubur Chowdhury Additional information is available at the end of the chapter http://dx.doi.org/10.5772/intechopen.70503 Provisionalchapter HydrothermalPrecipitationofβ-FeOOHNanoparticles in MixedWater/AlcoholSolvent MahabuburChowdhury Additional information isavailableat theendof thechapter Abstract In this research, synthesis of β-FeOOH nanoparticles was carried out using different alcohol/watermixed solvents. Four different alcoholsweremixedwithwater to form solution of different surface tension. A relationship between particle size and surface tension has been drawn from theoretical analysis. A linear relationshipwas shown to exist between surface tension and particle size under the reported conditions. Statisti- cally designed experiments were conducted to evaluate the interactions of process parametersontheparticlegrowth.Agenericcorrelationhasalsobeendevelopedempir- ically topredictparticle size. Keywords:β-FeOOH,nanorod, crystalgrowth, surface tension,generic correlation 1. Introduction Akaganeite, β-FeOOH, a type of iron oxy hydroxide has been studied intensively not only because of its great technological and scientific interest but also for many applications [1]. β-FeOOHisapromising electrodematerial that haspotential in rechargeable batteriesdue to its hollandite-like crystal structure with tunnel-like cavities [2]. β-FeOOH has also found applications inhydroprocessingof coal, removal of arsenate/arsenite [3] andphosphate from water [4]. Due to these intriguing applications, numerous works have investigated the methodsof akaganeite synthesis [2]. Surface tensionof solventplays an important role in the formationof1Dβ-FeOOHnanorods.Alowsurface tensionofsolventcanpromote thegrowth ofβ-FeOOHnanorods [5].Additionofmediumthatcan lower thesurface tensionofprecursor solutioncanalter thethermodynamicpropertiesof thereactionsystemandsubsequentlyaffect the nucleation kinetics, which would result in various morphology and particle sizes. The applicationofalcohol/watermixtureduringthesynthesisofdifferentmetaloxidenanoparticles © TheAuthor(s). Licensee InTech.This chapter isdistributedunder thetermsof theCreativeCommons AttributionLicense (http://creativecommons.org/licenses/by/3.0),whichpermitsunrestricteduse, distribution, andeproduction inanymedium,providedtheoriginalwork isproperlycited. DOI:10.5772/intechopen.70503 © 2018 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.