Fluorinated Polyolefin Pipette Tip Filter
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Solution Overview
Problem
Existing pipette tip filters with porous solid structures and hydrophobic coatings face issues with delamination and potential contamination from released molecules, increasing industrial complexity and costs.
Innovation Solution
A fluorination method using difluorine gas to replace hydrogen atoms with fluorine atoms in the polyolefin filter structure, creating a stable and continuous fluorine gradient that enhances hydrophobic properties without adding materials, thereby preventing delamination and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrophobic coating is applied to the porous solid structure of the filter, then the hydrophobic properties are enhanced, but the risk of delamination and contamination from released molecules increases
Solution Approach 1:
The patent merges the hydrophobic property directly into the polyolefin polymer structure by incorporating fluorinated side chains during polymerization, rather than applying a separate coating. This integration eliminates the interface between coating and substrate, preventing delamination and molecular release while maintaining superior hydrophobicity.
Solution Approach 2:
The invention creates a composite polymer structure where fluorinated side chains are grafted onto the polyolefin backbone. This composite material approach combines the structural integrity of polyolefin with the hydrophobic properties of fluorinated groups, achieving both reliability and safety.
2Reliability
If PTFE is used to make the filter, then superior hydrophobic properties are achieved, but the industrial processing complexity and cost increase
Solution Approach 1:
The patent changes the chemical structure parameter of conventional polyolefin by introducing fluorinated side chains during polymerization. This parameter modification enhances hydrophobicity to PTFE-level performance while maintaining the ease of processing and lower cost associated with polyolefin manufacturing.
Solution Approach 2:
The invention uses polyolefin, a cheaper and more easily processed material compared to PTFE, while achieving comparable hydrophobic properties through fluorinated side chain incorporation. This approach reduces industrial processing complexity and cost while maintaining functional performance.
3Reliability
If a hydrophobic coating is applied to the filter, then the hydrophobic properties are enhanced, but the industrial cost and process complexity increase
Solution Approach 1:
The patent incorporates fluorinated side chains during the polymerization process itself, performing the hydrophobicity enhancement action preliminarily during material production rather than as a subsequent coating step. This integrates the functional enhancement into the base manufacturing process, reducing additional costs and complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method imparts remarkable hydrophobic properties to the filter while maintaining the initial morphology and porosity, ensuring no risk of contamination and reducing industrial costs and complexity.
Implementation Method 1
contacting the filter with a fluorination agent introduced in the gaseous state into the enclosure... this fluorination agent consisting of difluorine F2... replacing, by fluorine atoms, at least some, or all, of the hydrogen atoms of the polyolefin
Data Source
AI summary
A method for fluorinating a filter for a pipette tip, the filter being made of a solid porous structure made of polyolefin. The method comprises the following steps: (a) placing the filter in an enclosure, (b) creating a vacuum in the enclosure, and (c) bringing the filter into contact with a fluorination agent injected into the enclosure in a gaseous state, the fluorination agent being made up of difluorine F2, the difluorine F2 being injected into the enclosure at a partial pressure between 100 Pa and 10000 Pa and step (c) being done at a temperature between 0° C. and 100° C. A pipette tip comprising a filter modified by the fluorination method, a method for producing such a tip, as well as a withdrawing pipette equipped with such a tip.