a filter with small pores used to separate very small particles from a suspension or colloidal solution
ultrafilter in American English
(ˌultrəˈfɪltər)
noun
1. Physical Chemistry
a filter for purifying sols, having a membrane with pores sufficiently small to prevent the passage of the suspended particles
2. Math
a filter in a topological space, having the property that no other filter exists in the space having among its subsets all the subsets in the given filter
transitive verb
3. Physical Chemistry
to purify by means of an ultrafilter
Derived forms
ultrafiltration (ˌultrəfɪlˈtreiʃən)
noun
Word origin
[ultra- + filter]ultra- is a prefix occurring originally in loanwords from Latin, with the basic meaning“on the far side of, beyond.” In relation to the base to which it is prefixed, ultra- has the senses “located beyond, on the far side of” (ultramontane; ultraviolet), “carrying to the furthest degree possible, on the fringe of” (ultraleft; ultramodern), “extremely” (ultralight); nouns to which it is added denote, in general, objects, properties, phenomena,etc., that surpass customary norms, or instruments designed to produce or deal withsuch things (ultramicroscope; ultrasound; ultrastructure)
Examples of 'ultrafilter' in a sentence
ultrafilter
Raw water was treated by a nanofilter and by coagulation before an ultrafilter.
Angelica Lidén, Kenneth M. Persson 2016, 'Feasibility Study of Advanced NOM-Reduction by Hollow Fiber Ultrafiltration and Nanofiltrationat a Swedish Surface Water Treatment Plant', Waterhttp://www.mdpi.com/2073-4441/8/4/150. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
In 2014 and 2016, we received two ultrafilter samples containing particulate material from two independent dialysis centers.
Sebastian Mas, Jesús Egido, Alberto Ortiz, Emilio Gonzalez-Parra 2018, 'Identification and Chemical Characterization of Insoluble Contaminants in HemodialysisWater Treatment', Waterhttp://www.mdpi.com/2073-4441/10/4/486. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)