MFI Zeolite Speaker Box Low-Frequency Acoustic Performance
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Solution Overview
Problem
The compactness of modern electronic devices, such as mobile phones, requires smaller speaker boxes with improved low-frequency acoustic performance, which is hindered by the reduced volume of the posterior cavity, and existing sound absorbing materials like high silica zeolite have limited low-frequency improvement due to moisture absorption and limited interaction with air molecules.
Innovation Solution
The use of MFI-structural-type zeolites with a silicon to aluminum mass ratio between 50 and 200, incorporating extra-framework cations, which enhances the micro-porous structure for better air molecule absorption and desorption, stability, and low-frequency performance, while being suitable for small cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high silica zeolite with high hydrophobicity (Si/Al mass ratio > 200) is used to maintain micro-pore patency, then moisture absorption is reduced, but the interaction with air molecules is limited due to small amount of charged ions
Solution Approach 1:
The patent optimizes the Si/Al mass ratio to a specific range (100-200) rather than using extremely high ratios (>200). This parameter adjustment creates an optimal balance: sufficient hydrophobicity to maintain micro-pore patency while maintaining enough charged ions for strong electrostatic interaction with air molecules, thereby resolving the contradiction between pore stability and adsorption capacity.
Solution Approach 2:
The patent uses MFI-structural-type zeolite with a specific framework composition that combines silicon dioxide and aluminum oxide in an optimized ratio. This composite material structure provides both the hydrophobic properties needed for pore patency and the charged ion density required for effective air molecule interaction, simultaneously addressing both requirements.
2Volume of moving object
If the volume of the posterior cavity is reduced to meet compact device requirements, then device size is reduced, but the low-band response deteriorates
Solution Approach 1:
The patent utilizes MFI-structural-type zeolite with a well-defined porous framework structure. The micro-pores provide large surface area and volume for air molecule interaction within a compact form factor, enabling effective low-frequency sound absorption and compliance enhancement without requiring a large posterior cavity volume.
Solution Approach 2:
The patent changes the physical and chemical parameters of the sound absorbing material by optimizing the Si/Al mass ratio and incorporating extra-framework cations. These parameter changes enhance the material's interaction with air molecules, compensating for the reduced cavity volume and maintaining low-frequency acoustic performance in compact devices.
3Quantity of substance
If MFI-structural-type zeolite with optimized Si/Al ratio is used, then air molecule absorption is enhanced, but water absorption may increase
Solution Approach 1:
The patent precisely controls the Si/Al mass ratio within the range of 100-200, which is lower than conventional high-silica zeolites (>200). This parameter change increases the aluminum content and thus the charged ion density, enhancing air molecule interaction while the specific MFI framework structure and extra-framework cations maintain appropriate hydrophobicity to limit excessive moisture absorption.
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 approach significantly improves low-frequency acoustic performance, maintains stability under varying conditions, and allows for effective packaging in small speaker boxes by balancing water absorption and electrostatic interactions, thus meeting the demands of smaller device volumes.
Implementation Method 1
the micro-pores under the acoustic pressure is used for absorbing and desorbing the attached air molecules
Implementation Method 2
the interaction between zeolite and air molecules (N2, O2) is mainly van der Waals force, and the electrostatic field interaction with air molecules is very limited
Implementation Method 3
the interaction between zeolite and air molecules (N2, O2) is mainly van der Waals force
Data Source
AI summary
The present disclosure provides a sound absorbing material. The sound absorbing material comprises MFI-structural-type zeolite. The MFI-structural-type zeolite comprises a framework, and the framework comprises SiO2 and AlO3, and the mass ratio of Si to Al in the framework is less than 200 and not less than 50. The present disclosure also provides a speaker box applying the sound absorbing material. The sound absorbing material provided by the present disclosure and the speaker box using the sound absorbing material can further improve the performance of the speaker box, reduce the failure of zeolite and improve the performance stability of the speaker box.