A surface-charged material that can adjust the freezing temperature of condensed water and its preparation method and application
A technology of freezing temperature and condensing water, which is applied in the field of chemical materials, can solve problems such as limitation and surface charge, and achieve the effects of low toxicity, good biocompatibility, and precise control of freezing temperature
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Embodiment 1
[0035] The preparation of the material with positive charge on the surface of the present invention that can adjust the freezing temperature of condensed water
[0036] Submerge the silicon wafer in a Bacine buffer solution of dopamine hydrochloride (2 mg / mL) and let it stand at room temperature for 24 hours to react on the surface of the silicon wafer to form a highly adhesive polydopamine film. Submerge the dopamine-modified solid substrate in a PBS buffer solution (1 mg / mL) of the polypeptide CPPPPK, place it at room temperature for 24 hours, and use the reactivity of polydopamine and polymers to modify CPPPPK to the surface of the substrate, thereby A material whose surface is modified with CPPPPK polypeptide is prepared. By contacting the surface-modified polypeptide with condensed water, the amino-NH in the lysine (K) residue 2 Protonation forms a positively charged -NH 3 + , resulting in a positively charged surface.
[0037] Determination of freezing temperature of...
Embodiment 2
[0040] The preparation of the material with negative charge on the surface of the present invention that can adjust the freezing temperature of condensed water
[0041] Submerge the silicon wafer in a Bacine buffer solution of dopamine hydrochloride (2 mg / mL) and let it stand at room temperature for 24 hours to react on the surface of the silicon wafer to form a highly adhesive polydopamine film. Submerge the dopamine-modified solid substrate in the PBS buffer solution (1mg / mL) of the polypeptide CPPPPE, place it at room temperature for 24 hours, and use the reactivity of polydopamine and the polymer to modify the CPPPPE to the surface of the substrate, thereby A material whose surface is modified with CPPPPE polypeptide is prepared. By contacting the surface-modified polypeptide with condensed water, the carboxyl group -COOH in the glutamic acid (E) residue is deprotonated to form the negatively charged -COO - , resulting in a negatively charged surface.
[0042] The mensur...
Embodiment 3
[0046] Preparation of sulfonated heparin-modified materials
[0047] Submerge the silicon wafer in a Bacine buffer solution of dopamine hydrochloride (2 mg / mL) and let it stand at room temperature for 24 hours to react on the surface of the silicon wafer to form a highly adhesive polydopamine film. Immerse the dopamine-modified solid substrate in an aqueous solution of sulfonated heparin (1 mg / mL), place it at room temperature for 24 hours, and use the reactivity of polydopamine and the polymer to modify the sulfonated heparin onto the surface of the substrate. Thus, the surface-modified material with sulfonated heparin was prepared. Formation of negatively charged -SO by ionization of the sulfonated heparin solution 3 - , resulting in a negatively charged surface.
[0048] The measurement of the freezing temperature of surface condensed water is the same as in Example 1.
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