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Method for distinguishing odd-to-even carbon thiol molecule by utilizing microbalance

A microbalance and carbon thiol technology, which is applied in the field of resolution of odd and even carbon thiol molecules, can solve the problems of inability to accurately determine the odd or even carbon number of alkanethiol, affecting the reproducibility of experiments, etc.

Active Publication Date: 2018-08-03
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally, contact angle or infrared reflectance spectroscopy (IRS) techniques are used to capture the "odd-even" effect of alkanethiols, but according to some laboratory reports, this phenomenon will be limited by the roughness of the contact surface, that is, the chain to be tested. Whether the surface contacted by alkanethiol is rough or smooth, the roughness will affect the reproducibility of the experiment, so it is impossible to accurately determine whether the carbon number of alkanethiol is odd or even

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Detection and determination of odd-carbon n-alkanethiols:

[0020] (1) Assembly of n-alkanethiols on a microbalance

[0021] First, a quartz crystal microbalance with a diameter of 1.4 cm and a thickness of 190 microns was obtained by AT cutting the quartz crystal. Both sides were polished with cerium, and the surface was washed with methanol until both sides of the quartz plate were clean. Afterwards, the thickness was obtained by spraying gold. nanometer gold film and rinsed with ethanol for cleaning. In addition, the normal alkanethiols with n=9, 11, 13, 15, and 17 were prepared with ethanol at a concentration of 1×10 -3 mol / L n-alkanethiol / ethanol solution. Then immerse 5 microbalances in the above mixed solution (this step can also be carried out 5 different experiments with 1 microbalance, and clean the surface each time), let stand for 15 hours, and then rinse thoroughly with ethanol surface, and blow dry with nitrogen;

[0022] (2) Hexane gas adsorption test...

Embodiment 2

[0027] Detection and determination of n-alkanethiols with even carbon number:

[0028] (1) Assembly of n-alkanethiols on a microbalance

[0029] First, a quartz crystal microbalance with a diameter of 1.4 cm and a thickness of 190 microns was obtained by AT cutting the quartz crystal. Both sides were polished with cerium, and the surface was washed with methanol until both sides of the quartz plate were clean. Afterwards, the thickness was obtained by spraying gold. nanometer gold film and rinsed with ethanol for cleaning. In addition, the normal alkanethiols with n=8, 10, 12, 14, 16, and 18 were formulated with ethanol to a concentration of 1×10 -3 mol / L n-alkanethiol / ethanol solution. Then immerse 6 microbalances in the above mixed solution (this step can also be carried out 6 different experiments with 1 microbalance, and clean the surface each time), let it stand for 15 hours, and then rinse thoroughly with ethanol surface, and blow dry with nitrogen;

[0030] (2) Hexa...

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Abstract

The invention discloses a method for distinguishing an odd-to-even carbon thiol molecule by utilizing a microbalance. The method comprises the following steps: firstly, taking a quartz crystal microbalance as a substrate and depositing a gold film on the substrate; then immersing the balance deposited with the gold film into ethanol solutions of CH3(CH2)7SH and normal paraffin thiol to be detectedCH3(CH2)nSH respectively for 12 to 20h, wherein n is a positive integer which is greater than or equal to 8; then drying the substrate by blowing; finally, taking hexane gas a probe molecule at roomtemperature and controlling hexane gas flow to be subjected to an adsorption test at a flow speed of 10ml / min to 50ml / min; determining odd and even carbon numbers of the normal paraffin thiol to be detected according to changes, caused by the normal paraffin thiol to be detected and the CH3(CH2)7SH, of the resonance frequency of the microbalance. The invention provides an ideal model for a research field of a microscopic molecule interface interaction effect and also can provides a novel way for constructing a high-specificity sensor on the molecule level.

Description

technical field [0001] The invention relates to a method for distinguishing odd and even carbon thiol molecules, in particular to a method for using a microbalance to distinguish even and odd carbon thiol molecules. Background technique [0002] The highly ordered arrangement of organosulfur single molecules on gold surfaces has attracted the attention of researchers in the past decade. This interest stems largely from the realization that such structures could serve as models for controllably building and manipulating organic surfaces in a variety of research fields. Especially n-alkanethiols with n greater than 8 (CH 3 (CH 2 ) n S - ) on the gold surface is highly ordered, and the chain length of alkanethiols with n lower than 8 is relatively short, so the order decreases. Adsorption of alkanethiols on gold surfaces has a preferential orientation in which the all-trans alkyl chain is inclined relative to the surface normal of the gold substrate As a result of this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/02
CPCG01N5/02
Inventor 成汉文罗谨
Owner SHANGHAI INST OF TECH