کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
593683 1453951 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Surface force arising from adsorbed diethylenetriaminepentacetic acid (DTPA) and related compounds and their metal ions complexes in alumina suspensions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Surface force arising from adsorbed diethylenetriaminepentacetic acid (DTPA) and related compounds and their metal ions complexes in alumina suspensions
چکیده انگلیسی

The zeta potential- and yield stress-pH behaviours of α-Al2O3 suspensions in the presence of diethylenetriaminepentacetic acid (DTPA) were evaluated. DTPA was found to act as an effective steric agent at concentration as low as 0.05 dwb% up to as high as 0.8 dwb%. The maximum yield stress of the suspension was reduced up to 76%. When compared to its lower molecular weight (Mw) counterparts; ethylenediaminetetracetic acid (EDTA) and nitrilotriacetic acid (NTA), this study revealed that DTPA had negligible bridging capability despite having a higher Mw and degree of branching. DTPA, EDTA and NTA were deduced to adsorb lying flat on the particle surface. Chelating EDTA and DTPA to metal ions increased the rigidity of its structures. The [ZnDTPA]3− and [CuDTPA]3− complexes imparted certain degree of bridging between particles. This bridging interaction is quite weak. The chelate structure showed the possibility of particle bridging occurring. However [ZnEDTA]2−, [CuEDTA]2− and [FeEDTA]− do not possessed a structure for particle bridging to occur and as a result they acts as an effective steric agents. The DTPA complex ions have one or two free carboxylate groups to participate in bridging while that of EDTA has none.

Figure optionsDownload as PowerPoint slideHighlights
► DTPA was found to act as an effective steric agent.
► DTPA and EDTA were deduced to adsorb lying flat on the particle surface.
► Metal–DTPA and –EDTA complexes are very rigidity and have different configurations.
► Metal–DTPA complexes imparted certain degree of bridging via inter-hydrogen bonding.
► Structures of metal–EDTA complexes are not favorable to particle bridging.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 422, 5 April 2013, Pages 172–180
نویسندگان
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