Shape Memory Polymer for Selective Oil Separation
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Solution Overview
Problem
Conventional methods for separating oil from contaminated water, such as sorbents and skimmers, suffer from lack of selectivity, limited reusability, and generate significant waste, with existing technologies being inefficient and environmentally hazardous.
Innovation Solution
A method utilizing a shaped body with a three-dimensional surface structure made from shape-memory materials that selectively absorbs non-polar liquids, allowing for continuous separation and reuse by temporarily flattening the surface to release the liquid, which then reverts to its original shape for repeated use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional sorbents (sawdust, rice straw, cotton) are used to skim off oil, then the oil absorption capacity is improved, but the selectivity deteriorates because they absorb large amounts of water in addition to oil
Solution Approach 1:
The shaped body is provided with a three-dimensional surface structure that creates local hydrophobic regions. This local quality differentiation allows the surface to selectively interact with oil versus water at specific locations, achieving high selectivity while maintaining absorption capacity
Solution Approach 2:
The shaped body comprises a composite structure combining a base material with a hydrophobic surface layer or coating. This composite construction enables the material to exhibit both oil absorption capability and water repellency simultaneously, resolving the selectivity issue
2Reliability
If sorbents with selective absorption properties are used, then the selectivity is improved, but the reusability deteriorates because they cannot be used more than once
Solution Approach 1:
The three-dimensional surface structure is designed to be dynamically changeable between an expanded state (for oil absorption) and a compressed state (for liquid release). This dynamic transformation enables the shaped body to be reused multiple times by simply changing its physical state, not requiring chemical reprocessing
Solution Approach 2:
Instead of discarding the saturated shaped body, the invention recovers it by compressing the structure to release the absorbed liquid. The recovered shaped body can then be reused for additional absorption cycles, eliminating waste generation
3Reliability
If the shaped body uses a three-dimensional surface structure for selective absorption, then the selectivity is improved, but the device complexity increases
Solution Approach 1:
The complex three-dimensional surface structure is created by changing physical parameters during manufacturing (such as porosity, surface area, and hydrophobicity parameters) rather than through complex device design. This allows the complexity to be built into the material structure itself, simplifying the overall device
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
Enables highly selective and efficient continuous separation of non-polar liquids like oil from water, reducing waste and environmental impact, with the ability to reuse the shaped body without chemical treatment, achieving lower residual water content than traditional methods.
Implementation Method 1
the shaped body comprising at least partially a shape memory material, the shaped body having a three-dimensional surface structure which in a permanent form at least partially has a hydrophobic and/or superhydrophobic surface. In the second process step b), the shaped body is brought into contact with at least one liquid or with a mixture of several liquids, with at least one liquid adhering selectively to the shaped body. In the further process step c), the surface structure is converted into a temporary shape by means of flattening, the at least partially hydrophobic and/or superhydrophobic surface being minimized.
Implementation Method 2
the shaped body having a three-dimensional surface structure which in a permanent form at least partially has a hydrophobic and/or superhydrophobic surface
Implementation Method 3
with at least one liquid adhering selectively to the shaped body
Data Source
Figure 1a~1e
Figure 2~3
Figure 4
AI summary
The invention relates to a method for separating at least one liquid from a moulded body. The first method step a) comprises providing a moulded body (1) at least partially comprising a shape memory material, wherein the moulded body (1) has a three-dimensional surface structure (2), which at least partially has a superhydrophobic surface in a permanent mould (10). In a further method step b), the moulded body (1) is brought into contact with at least one liquid (3) or with a mixture of a number of liquids (30), wherein at least one liquid (3) will selectively adhere to the moulded body (1). Subsequently, in a method step c), the surface structure (2) is transferred into a temporary mould (11) by means of flat pressing, wherein the at least partially superhydrophobic surface is minimized. After the removal of the at least one liquid (3), the surface structure (2) is returned to the permanent mould (10).