Titania Particle Morphology Control via Spray Drying
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Solution Overview
Problem
Current methods for producing titania particles lack control over morphology, specifically shape and porosity, which is crucial for various applications requiring tailored properties beyond high specific surface areas, and raise concerns regarding the environmental impact of nano materials.
Innovation Solution
A process involving controlled nucleation, flocculation, and drying conditions to produce titania particles with desired morphology, including spherical or toroidal shapes and controlled pore sizes, using techniques like spray drying and pH adjustment to achieve specific surface areas and shapes suitable for diverse applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drying methods are used to produce titania particles, then production simplicity is maintained, but morphology control (shape and porosity) is insufficient
Solution Approach 1:
The invention applies parameter changes by systematically varying drying conditions (temperature, humidity, drying rate) to control the morphology of titania particles. By adjusting these parameters during the drying process, the invention achieves control over particle shape (spherical or toroidal) and porosity, directly resolving the contradiction between morphology control and process simplicity.
2Reliability
If high specific surface area is achieved through nano materials, then catalytic activity is improved, but environmental health and safety concerns increase
Solution Approach 1:
The invention applies local quality by creating controlled porosity and specific surface area distributions within the titania particles rather than relying solely on reducing particle size to the nano scale. This allows achieving high catalytic activity through optimized internal structure and surface properties while maintaining larger, safer particle sizes that reduce environmental health concerns.
3Manufacturing precision
If spray drying temperature is increased to obtain toroidal particles, then particle shape control is achieved, but energy consumption increases
Solution Approach 1:
The invention applies partial or excessive action by using controlled excessive temperature during specific stages of spray drying to achieve the desired toroidal particle shape, then reducing temperature in subsequent stages. This allows achieving precise shape control while minimizing overall energy consumption by applying high temperature only when and where necessary for morphology development.
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 process enables the production of titania particles with controlled morphology, maintaining high integrity and resistance to external forces, suitable for applications such as catalysis, self-cleaning, and drug delivery, while avoiding the need for nano materials and addressing environmental concerns.
Implementation Method 1
The titania sol is dried by application of heat and spray drying is used and the temperature used during the spray drying step is controlled to be in the range of from 50 to 350°C
Implementation Method 2
the titania sol is dried by application of heat and spray drying is used and the temperature used during the spray drying step is controlled to be in the range of from 50 to 350°C
Data Source
Figure 1
Figure 2a
Figure 2b~2f
AI summary
The invention provides a process for the production of titania particles with a desired morphology. The process comprises providing a titania sol and then trying the sol to provide dried titania particles. The process is characterised in that the morphology of the dried titania particles is controlled by applying one or more of the following criteria:(a) the titania sol is produced from a TiO2 containing slurry obtained using a precipitation step in a sulphate process, wherein the size of micelles formed during the precipitation is controlled; (b) the titania sol is produced from a TiO2 containing slurry and the pH of the slurry is controlled in order to affect the extent to which the titania sol is flocculated; (c) the titania sol is produced from a TiO2 containings lurry and the iso-electric point of the titania is adjusted in order to affect the extent to which the titania sol is flocculated; (d) the titania sol is dried by application of heat and the temperature used during the drying step is controlled.