Inductive Nanoelectrospray Ion Formation for Low-Flow Mass Spectrometry
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Solution Overview
Problem
Existing systems combining miniaturized instrumentation and ambient ionization in mass spectrometry are limited by low pumping speed and large nebulizing gas and solvent volumes, requiring improvements in sensitivity and sampling efficiency.
Innovation Solution
A system that applies high voltage to nanoelectrospray tips without physical contact, using inductive charging to synchronize droplet creation with the opening of a discontinuous atmospheric pressure interface, reducing solvent and gas flow rates, and enabling quasi-simultaneous production of positive and negative ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If miniaturized instrumentation and ambient ionization are combined, then portability and ease of use are improved, but sensitivity and sampling efficiency deteriorate due to low pumping speed and large nebulizing gas and solvent volumes
Solution Approach 1:
The patent employs periodic action by using pulsed high voltage applied to the nanoelectrospray tip at specific frequencies (e.g., 10-3000 Hz) to generate bursts of charged droplets. This periodic droplet generation is synchronized with the opening and closing of the discontinuous atmospheric pressure interface, allowing ions to be introduced into the mass spectrometer only during brief time windows when the interface is open. This temporal synchronization dramatically improves sensitivity by concentrating ion delivery during the analysis phase while minimizing solvent and gas flow during the pumping phase.
2Stability of the object's composition
If continuous solvent and gas flow are used, then stable ion production is maintained, but pumping speed limitations and large volume handling reduce sensitivity
Solution Approach 1:
The system transitions from continuous to periodic operation by pulsing the high voltage at frequencies that generate discrete bursts of charged droplets. The discontinuous atmospheric pressure interface opens and closes in synchronization with these pulses, creating a periodic cycle where ions are admitted during the open phase and the system is pumped during the closed phase. This periodic operation maintains stable ion production through consistent pulse timing while dramatically reducing the average solvent and gas flow rates that the pump must handle.
Solution Approach 2:
The high voltage is applied to the nanoelectrospray tip in advance of the interface opening, pre-forming charged droplets that are ready for immediate ionization and transfer when the interface opens. This preliminary action ensures that ion production is optimized and ready to go as soon as the pumping limitation is temporarily removed by opening the interface.
3Productivity
If high voltage is applied continuously, then ion production is maintained, but energy consumption and heat generation increase
Solution Approach 1:
The high voltage is applied in periodic pulses rather than continuously, with pulse frequencies ranging from 10-3000 Hz. Each pulse generates a burst of charged droplets that produces ions during the brief time the discontinuous interface is open. Between pulses, the high voltage is removed, allowing the system to cool and reducing energy consumption. This periodic application maintains adequate ion production for analysis while dramatically reducing average power consumption and heat generation compared to continuous high voltage application.
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
Achieves a 100-fold improvement in sensitivity, reduces solvent and gas flow rates by an order of magnitude, and allows for simultaneous detection of both ion polarities, enhancing sampling efficiency and analytical performance.
Implementation Method 1
Ion formation from an emitter by inductive voltage... The induced high voltage leads to burst of droplets in nanoelectrospray
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2a~2b
AI summary
The invention generally relates to ion formation by inductive application of voltages to an emitter.