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Temperature sensitive composite gold nano particles and preparation method and catalytic application thereof

A nanoparticle and composite gold technology, which is applied in the field of gold nanomaterials, can solve problems such as easy coagulation, poor stability, and poor temperature sensitivity, and achieve good temperature sensitivity, good stability, and simple, convenient and fast preparation methods.

Inactive Publication Date: 2011-12-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in previous studies, the preparation of gold nanoparticles usually adopts a two-step method, which requires several hours of reaction and several days of dialysis, and the preparation process is relatively complicated; Coagulation is prone to occur under high temperature conditions, and the stability is poor; and the reaction cannot be completely terminated when the temperature is too high, and the temperature sensitivity is poor

Method used

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  • Temperature sensitive composite gold nano particles and preparation method and catalytic application thereof
  • Temperature sensitive composite gold nano particles and preparation method and catalytic application thereof
  • Temperature sensitive composite gold nano particles and preparation method and catalytic application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Synthesis of polyisopropylacrylamide grafted dextran polymer (DexPNI):

[0023] Add 12mL of dodecanethiol, 40mL of acetone and 0.8mL of trioctylmethylammonium chloride into a 150mL three-necked flask, under N 2 Under protection, cool to 10°C. Add 4 mL of 50% sodium hydroxide solution dropwise within 20 minutes, and stir for 15 minutes after the dropwise addition. A mixed solution of 3mL carbon disulfide and 8mL acetone was added dropwise, at this time the solution gradually turned red, and the reaction was continued for 30min with stirring. After that, 13 mL of 50% sodium hydroxide was added dropwise, and stirred at room temperature for 12 h. Add 65mL of water and acidify with 33mL of concentrated hydrochloric acid to finally obtain a yellow solid. The yellow solid was recrystallized eight times with n-hexane, and the obtained yellow crystal was 2-dodecyltrithiocarbonyl-2-methylpropionic acid (DTM). in N 2 Under protection, 0.55 g of DTM was dissolved in 5 mL o...

Embodiment 2

[0030] Step (1) of this embodiment is the same as step (1) of Embodiment 1.

[0031] (2) Synthesis of temperature-sensitive composite gold nanoparticles:

[0032] Polymer (DexPNI) solution (1mL, 10mg / mL) and chloroauric acid (HAuCl 4 ) (1mL, 10mmol / L) mixed, then add excess sodium borohydride (NaBH 4 ) (5mL, 10mmol / mL), shake until the reaction color does not change (about 1min), and gold nanoparticles are formed.

[0033]The colloidal solution of gold nanoparticles is brown, and the transmission electron microscope analysis of the product shows that its particle size is about 3.4±0.9nm, it is spherical, and there is no obvious agglomeration phenomenon. It is a characteristic peak of gold nanoparticles with a particle size greater than 3nm. When the temperature rises to 40°C, the absorbance increases significantly, and the peak red shifts to 526nm.

Embodiment 3

[0035] Step (1) of this embodiment is the same as step (1) of Embodiment 1.

[0036] (2) Synthesis of temperature-sensitive composite gold nanoparticles:

[0037] Polymer (DexPNI) solution (1mL, 10mg / mL) and chloroauric acid (HAuCl 4 ) (2mL, 10mmol / L) mixed, then add excess sodium borohydride (NaBH 4 ) (10mL, 10mmol / mL), shake until the reaction color does not change (about 1min), and gold nanoparticles are formed.

[0038] The gold nanoparticle colloidal solution is red, and the transmission electron microscope analysis of the product shows that its particle size is about 10±1nm, and its shape is circular, triangular and polygonal.

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Abstract

The invention relates to temperature sensitive composite gold nano particles and a preparation method and catalytic application thereof. The temperature sensitive composite gold nano particles are compounded by using nano gold particles and poly (N-isopropyl acrylamide) (PNIPAM) grafted glucan polymer, and the diameter of the particles is 1 to 20 nanometers; the preparation method comprises the following process of: mixing and shaking chloroauric acid serving as a precursor, the PNIPAM grafted glucan polymer serving as a nucleating agent and a stabilizing agent and sodium borohydride serving as a reducing agent to obtain a product; and the temperature sensitive composite gold nano particles serving as a catalyst are used for regulating and controlling the temperature of the nitrophenol reduction reaction process to control the process and the stop of the reaction. The invention has the advantages that: the preparation process is simple; and the prepared temperature sensitive composite gold nano particles have high dispersion, good stability and temperature sensitivity, and are used as the catalyst for controlling the nitrophenol reduction reaction process.

Description

technical field [0001] The invention relates to a temperature-sensitive composite gold nanoparticle, a preparation method and a catalytic application thereof, and belongs to the technical field of gold nanomaterials. Background technique [0002] Nanomaterials have many special properties that traditional materials do not have, and have attracted widespread attention at home and abroad. Among them, gold nanoparticles are widely used in drug delivery, disease diagnosis, optical devices, electronic instruments and microreactors due to their good biocompatibility, special optical properties, electrical properties and catalytic performance. Gold nanoparticles also have good catalytic properties, and Au is the most inert metal and is generally considered to have no catalytic activity. However, highly dispersed Au nanoparticles with nanoscale size have good catalytic activity (M. Haruta, Nature, 2005, 437, 1098-1099). [0003] An important research direction of gold nanoparticle...

Claims

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Application Information

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IPC IPC(8): C08L51/02C08K3/08C08F251/00C08B37/02B01J31/26C07C215/76C07C213/02
Inventor 张凤宝汪洋吕威鹏张国亮张淼
Owner TIANJIN UNIV
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