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Tio2 nanostructures, membranes and films, and methods of making same

A nanostructure, nanofiber technology, used in nanostructure fabrication, chemical instruments and methods, nanotechnology, etc.

Inactive Publication Date: 2010-03-10
阿肯色州大学技术发展基金会
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the mass fabrication of robust, thermally stable, and multifunctional macroscopic 3D structures directly from 1D nanomaterials remains a challenge.

Method used

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  • Tio2 nanostructures, membranes and films, and methods of making same
  • Tio2 nanostructures, membranes and films, and methods of making same
  • Tio2 nanostructures, membranes and films, and methods of making same

Examples

Experimental program
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Effect test

Embodiment 1

[0105] Synthetic TiO 2 Large-scale nanofibers / nanowires and fabrication of FSM and 3D devices: According to the present invention, a TiO-containing 2 Synthesis of large-scale nanofibers / nanowires.

[0106] In this typical example, about 0.3 g TiO 2 The powder (Degussa P25) was added to 40ml of 10M alkali metal or alkaline solution, and these mixtures were placed in a Teflon-lined autoclave container with a capacity of 150ml. The container was sealed and placed in an oven to heat for 7 days. Collect the white slurry containing TiO 2 The large-size nanofiber products were washed with distilled water or dilute acid. The washed white slurry containing TiO 2 The product of large-size nanofibers was cast on a macroscopic template (made of ashless filter paper (Watman) or polyethylene film), followed by drying at RT. The cast-in-drying process was repeated several times at RT, followed by heating in an oven (heating temperature 0-180° C.) for about 0.5-30 hours. Thus, using th...

Embodiment 2

[0121] Contains TiO 2 The immediate application of large-scale nanofibers is to provide write-erase-rewrite functionality for information storage with the help of UV irradiation. TiO 2 Often used as an inexpensive and non-toxic photocatalyst. After being excited by UV rays, TiO 2 Can catalyze dye degradation [25].

[0122] In this example, 4 characters "UARK" of hydrated ink (1.0 x 1 mol / L crystal violet) was written to the TiO-containing 2 The large size nanofibers were fabricated on FSM paper 610. The FSM paper 610 having the written information of "UARK" was exposed to UV rays in the air. After 15 minutes of exposure to UV rays, the 4 characters "UARK" disappear, as Image 6 as shown in b. In this example, the write-erase cycle can be repeated 4 times on the FSM paper 610 (21.4 mg). After exposure to UV rays, all 4 characters "UARK" are erased every time, as in Image 6 as shown in b. However, for regular printing paper 620 (49.0 mg), each UV irradiation resulted ...

Embodiment 3

[0125] Contains TiO 2 Another application of large-size nanofibers is photocatalysis. It has been confirmed that TiO 2 The photocatalytic activity of -B phase is superior to other TiO 2 Phase [27]. These robust nanowire-based membrane catalysts are unique in the photocatalytic decomposition of organic pollutants due to their large pore size properties [15]. Such as Nerve Agent Analogs (NAS) [15], for example, (C2H5O)2P(O)(H2CSC6H5) (Aldrich).

[0126] In a typical embodiment, the TiO-containing 2 10mg FSM made of large size nanofibers was soaked in about 10mL 1mol / L Mg(NO 3 ) 2 12 hours. The impregnated FSM was dried at RT, followed by heating above 100°C in air for about 3 hours. The heated FSM is then placed into a solution containing various organic contaminants. In this example, the organic contaminants include NAS. A UV lamp (Entella, type B100AP / R) was set at 5 mm above the solution to irradiate the FSM with UV. Adopt UV visible spectrometer (such as HP (Hewle...

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Abstract

One aspect of the present invention relates to a method for synthesizing macro-sized nanostructures. The method in one embodiment comprises the steps of mixing an amount of TiO2 powders with a volumeof an alkali or alkaline solution to form a mixture, and heating the mixture at a temperature higher than 160 0C for a period of time effective to allow TiO2-containing, macro-sized nanostructures toform, wherein the TiCh-containing, macro-sized nanostructures form in an environment that has no presence of a substrate that comprises Ti. These TiO2-containing, macro-sized nanostructures can be utilized to form a free standing membrane, and / or a three- dimensional (3D) structure.

Description

technical field [0001] The present invention relates to nanostructures, and more particularly to a TiO-containing 2 Large-scale (macro-sized) nanostructures, as well as their preparation methods and applications. Background technique [0002] Because in the nanoscale (nanoscale), one-dimensional (1D) structural confinement (structural confinement) is related to its large number of unique physical and chemical properties, so a lot of research has been done on one-dimensional nanostructures [1]. Due to their high thermal stability and chemical inertness, inorganic nanofibers (including nanowires and nanotubes) can be assembled into freestanding membranes (FSMs) for important applications in high temperature and harsh environments [2]. In order to make the FSM robust, inorganic nanofibers that are extraordinarily long and tightly bonded to each other are required. In turn, the inorganic FSMs thus produced possess unique porosity, permeability, thermal stability, chemical iner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J6/00B01J20/00B01J20/06B01J20/28B01J20/32B01J23/00B01J35/00B01J37/02B01J37/08B32B5/22B32B5/26B32B5/32B32B15/01B82B1/00B82B3/00C01G23/047C01G23/08
Inventor Z·瑞恩·田
Owner 阿肯色州大学技术发展基金会
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