Pipette based on surface charges

Patent metadata

Field	Value
Publication number	US-11224872-B2
Application number	US-201916575412-A
Country	US
Kind code	B2
Filing date	Sep 19, 2019
Priority date	Jun 27, 2019
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

A pipette based on surface charges includes a pipette body. A plurality of support rods are provided below the pipette body. Connecting rods are provided at the lower ends of two adjacent support rods. A substrate is provided between the connecting rods. A porous SiO2 coating is provided on the substrate. A hydrophobic molecule layer is provided on the surface coating by the vapor deposition method. A superamphiphobic surface is formed on the substrate by the surface coating and the hydrophobic molecule layer. The substrate and the surface coating are made of dielectric materials. A circular limit plate is provided above the pipette body. The pipette body, the support rods, the connecting rods and the limit plate are integrally formed, and are electrically non-conductive. An electrically conductive sliding rod is movably provided within the pipette body and the limit plate.

First claim

What is claimed is:

1. A pipette based on surface charges, comprising:
a pipette body including an upper end and a lower end;
a plurality of support rods provided at and connect to the lower end of the pipette body;
two connecting rods, wherein the two connecting rods are each respectively connected to and between respective lower ends of one of a first or second pair of two adjacent support rods of the plurality of support rods; the first pair is different from the second pair;
a substrate connected to and between the two connecting rods, wherein a porous SiO 2 coating is provided on the substrate, a hydrophobic molecule layer is provided on the hydrophobic surface coating, a superamphiphobic surface is formed on the substrate by the porous SiO 2 coating and the hydrophobic molecule layer, and the substrate and the porous SiO 2 coating are made of dielectric materials;
an electrically conductive sliding rod movably provided through the pipette body;
a circular limit plate provided around the electrically conductive sliding rod above the pipette body, wherein the electrically conductive sliding rod is movably provided through the circular limit plate; and the pipette body, the support rods, the two connecting rods and the circular limit plate are electrically non-conductive;
a sheet conductor connected to and provided at a lower end of the electrically conductive sliding rod; and
a push plate connected to and provided at an upper end of the electrically conductive sliding rod.

2. The pipette based on the surface charges of claim 1 , wherein a distance from the circular limit plate to the substrate is greater than a length of the electrically conductive sliding rod.

3. The pipette based on the surface charges of claim 1 , wherein a material of the substrate is glass, polytetrafluoroethylene or a copolymer of fluorinated ethylene propylene.

4. The pipette based on the surface charges of claim 1 , wherein the hydrophobic molecule layer is a layer of perfluorooctyl trichlorosilane molecules.

5. The pipette based on the surface charges of claim 1 , wherein the substrate has a thickness of 160-180 μm and a diameter of 16-19 mm.

6. The pipette based on the surface charges of claim 1 , wherein the superamphiphobic surface coating has a thickness of 5-50 μm.

7. The pipette based on the surface charges of claim 1 , wherein the sheet conductor has a thickness of equal to or more than 0.5 mm.

Assignees

• Univ Electronic Sci & Tech China

Inventors

• Deng Xu
• Sun Qiangqiang
• Zhou Yu

Classifications

• B01L2400/0424

  Dielectrophoretic forces · CPC title

• B01L2300/165

  Specific details about hydrophobic, oleophobic surfaces · CPC title

• B01L2300/12

  Specific details about materials · CPC title

• B01L3/0213

  Accessories for glass pipettes; Gun-type pipettes, e.g. safety devices, pumps · CPC title

• B01L3/021 Primary

  Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids · CPC title