Polymer Slides with Hydrophobic Small Molecules for MALDI Targets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polymer substrates used in MALDI targets experience unstable hydrophobic surface properties over time, leading to inconsistent performance in mass spectrometry due to uneven deposition and migration of hydrophobic additives, which affects the precision and reliability of analyte desorption.
Innovation Solution
Incorporating hydrophobic small molecules into the polymer bulk and annealing the polymer parts to induce migration of these molecules to the surface, creating a stable and defined hydrophobicity that maintains surface energy stability over long periods through slow thermally-activated migration, even when coated with other materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrophobic additives are used to modify polymer surface properties, then the desired hydrophobicity is achieved, but the additives accumulate at the surface over time causing instability
Solution Approach 1:
The patent applies preliminary action by incorporating the hydrophobic additive into the polymer bulk before processing, and then performing a controlled thermal treatment (annealing at 60-80°C for 1-24 hours) to pre-establish the desired surface concentration. This preliminary thermal treatment causes the additive to migrate to the surface in advance, creating a stable surface layer that resists further migration and maintains compositional stability over time.
Solution Approach 2:
The patent applies parameter changes by controlling the thermal treatment parameters (temperature between 60-80°C and time between 1-24 hours) to optimize the migration of hydrophobic additive from the bulk to the surface. By adjusting these parameters, the surface concentration of the additive can be precisely controlled to achieve the desired contact angle (70-110 degrees) while maintaining long-term stability and preventing excessive accumulation.
2Reliability
If large amounts of additives are used to achieve desired properties, then the properties are improved, but the additives accumulate at the surface making the composition unstable
Solution Approach 1:
The patent uses preliminary action by performing a controlled thermal treatment (annealing) before final use to pre-concentrate the additive at the surface. This allows the bulk composition to contain lower overall additive concentrations (0.1-10% by weight) while still achieving the desired surface hydrophobicity (contact angle 70-110 degrees) through the preliminary thermal migration process, thereby preventing excessive accumulation and maintaining stability.
Solution Approach 2:
The patent applies parameter changes by optimizing the thermal treatment parameters (temperature 60-80°C, time 1-24 hours) to control the migration rate and final surface concentration of the additive. This enables the use of lower bulk additive concentrations while achieving the required surface properties, as the thermal parameters control the distribution rather than relying on high initial concentrations.
3Ease of operation
If polymer substrates are used for MALDI targets, then single-use convenience is achieved, but surface hydrophobicity becomes unstable over time affecting performance
Solution Approach 1:
The patent applies preliminary action by incorporating the hydrophobic additive (such as fatty acids or waxes) into the polymer substrate during manufacturing, and then performing a preliminary thermal treatment (annealing at 60-80°C for 1-24 hours) to establish the correct surface concentration before the target is used. This ensures that the surface hydrophobicity is stable and consistent from the beginning of use, preventing performance variations during the operational lifetime of the single-use target.
Solution Approach 2:
The patent applies parameter changes by controlling the thermal treatment parameters to achieve the optimal surface concentration of hydrophobic additive, resulting in a contact angle within the range of 70-110 degrees. This parameter control ensures consistent surface energy and hydrophobicity across all single-use targets, maintaining reliable and reproducible MALDI performance throughout their operational lifetime.
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
This method ensures well-defined and long-term stable surface energy on polymer parts, enhancing the precision and reliability of MALDI targets by maintaining hydrophobicity and preventing surface instability issues.
Implementation Method 1
annealing the polymer parts to induce migration of these molecules to the surface, creating a stable and defined hydrophobicity that maintains surface energy stability over long periods through slow thermally-activated migration
Implementation Method 2
annealing the polymer parts to induce migration of these molecules to the surface, creating a stable and defined hydrophobicity that maintains surface energy stability over long periods through slow thermally-activated migration
Data Source
AI summary
A plurality of polymer slides, each having a polymer part with a first polymer surface portion uncoated and a second surface portion coated with a metal. The first and second surface portions each have different surface coating properties and have respective first and second specified degrees of hydrophobicity which are different from each other. A hydrophobic small molecule is located in the polymer part of each polymer slide, and the hydrophobic small molecule and the polymer are essentially inert to one another. Adjacent polymer slides are arranged in a manner that the first polymer surface of one slide faces a metal coated second surface portion of another slide. The hydrophobic small molecule evaporates from said first polymer surface portion of the polymer part of one polymer slide onto the adjacent metal coated second surface portion of another polymer slide.