Thio-,amine-,nitro-,and macrocyclic containing organic aerogels & xerogels
View Patent ↗An organic aerogel or xerogel formed by a sol-gel reaction using starting materials that exhibit similar reactivity to the most commonly used resorcinol starting material. The new starting materials, including thio-, amine- and nitro-containing molecules and functionalized macrocyclic molecules will produce organic xerogels and aerogels that have improved performance in the areas of detection and sensor technology, as well as water stream remediation. Also, further functionalization of these new organic aerogels or xerogels will yield material that can be extracted with greater facility than current organic aerogels.
1. In a sol-gel process for producing resorcinol-formaldehyde aerogels, the improvement comprising:
substituting a 1,3-difunctionalized benzene derivative other than resorcinol for the resorcinol starting material, wherein said 1,3-difunctionalized benzene derivative exhibits similar reactivity to that of the resorcinol starting material.
2. The improvement of claim 1 , wherein said 1,3-difunctionalized benzene derivative material is selected from the group consisting of thio-containing molecules, amine-containing molecules and nitro-containing molecules.
3. The improvement of claim 1 , wherein said 1,3-difunctionalized benzene derivative is functionalized with at least one electron-withdrawing moietie.
4. The improvement of claim 3 , wherein said electron-withdrawing moietie is SH, SH 2 , NO 2 , CF 3 , CO 2 H, or NF 2 .
5. In a sol-gel process for fabricating aerogels and xerogel utilizing a melamine-formaldehyde sol-gel reaction, the improvement comprising:
substituting functionalized macrocycles in place of melamine.
6. The improvement of claim 5 , wherein said functionalized macrocyclic molecules are defined as any heterocyclic species containing a combination of heteroatoms including oxygen, nitrogen, and sulfur.
7. The improvement of claim 5 , wherein the macrocycles comprise any heterocyclic species containing combinations of heteroatoms.
8. The improvement of claim 7 , wherein the heteroatoms are selected from the group consisting of oxygen, nitrogen and sulfur.
9. The improvement of claim 5 , wherein the substituting of functionalized macrocycles is carried out by the following reaction:
wherein n=number of atoms in carbon backbone, x=heteroatom, and y=number of units in macrocycle.
10. The improvement of claim 9 , wherein the heteroatom is selected from the group consisting of oxygen, nitrogen, and sulfur.
11. A sol-gel process using starting materials containing molecular molecules selected from the group consisting of thio-, amine-, and nitro-containing molecules, and wherein incorporation of these starting materials is carried out via the following reaction:
where R=an electron-withdrawing moiety.
12. The sol-gel process of claim 11 , where R is SH, NH 2 , NO 2 , CF 3 , CO 2 H, or NF 2 .