报告题目：Preparation of size-selected pure, mixed and composite metal oxide nanoparticles for environmental and photonic applications

报告人：Andrei V. Kanaev

主持人（邀请人）：崔小强教授

报告时间：2018年12月12日，星期三，上午10：00

报告地点：尊龙凯时中心校区唐敖庆楼D429

主办单位：材料科学与工程学院

汽车材料教育部重点实验室

摘要：

A control of the initial nucleation-growth stage contributes in attaining targeted properties by the final material. In this connection, mixing is considered to be a key process in tailoring the mean particle size and polydispersity. It becomes more and more critical when the particle reactivity increases and size decreases, which is a general case of a sol-gel process. Considering micro-mixing in a macroscopic fluid flow with high Reynolds number, the characteristic time of the physical mixing (phys) can become smaller than that of chemical reactions (chem). In such case, the reaction medium attains so-called point-like reaction conditions, which lead to the smallest size and narrowest size distribution of nanoparticles. This regime corresponds to small Damköhler numbers, Da=phys/chem1.

In present lecture, an impact of the micro-mixing phenomenon on pure (TiO2, ZrO2), mixed (TixZr1-xO2) and composite (Ar/Au-TiO2) nanoparticles nucleation in a sol-gel process will be discussed. The nucleation stage is achieved in a T-mixer device with two input reactant fluids containing metal oxide precursors and water are injected at high Reynolds numbers between 103 and 104 enabling strongly turbulent flow conditions (up to the cavitation regime). The particle size was monitored by in-situ DLS/SLS method and confirmed by ex-situ TEM analysis. The numerical simulations of the flow behaviour were carried out in order to access the fundamental characteristics of the mixing process.

The adequate design of the reactor permits a control of the particles size and agglomeration state, which is a challenging task in nanotechnology and nanomaterials. Based on the size-selected nanoparticles, examples of functional coatings, ultra-porous monoliths and organic-inorganic hybrids will be given for application in catalysis, photocatalysis, plasma-catalysis and photonics. Such bulk solids possess nano-size specific properties and high specific surface area of the active phase.

报告人简介：

Permanent position: Research Director (1st class) C.N.R.S.

Affiliation: Laboratoire des Sciences des Matériaux et des Procédés

(LSPM), UPR 3407 CNRS, Université Paris 13, 99 av. J.‐B. Clément, 93430

Villetaneuse, France

Awards:

Alexander‐von‐Humboldt Fellow, Germany 1989; ACS and Elsevier Appreciation

Certificates; Nominations of Invited Professor in France and Italy; Supervisor of

PhD received ‘National Award for Outstanding PhD Study Abroad’ 2013 (China).

Administrative and other responsibilities:

Head of department “Inorganic Materials and Nanostructures” (MINOS) at LSPM.

Member of Excellence Laboratory SEAM (France).

Member of the Advisory Board of HiLASE Centre (Prague, Czech Republic).

Associate Editor of Journal Applied Physics A (Springer).

Member of Editorial Committee of International Journal of Advanced Applied Physics Research

Member of the Direction Committee of LSPM CNRS.

Member of Expert Committee “Process and Chemical Engineering” of University Paris 13.

Member of Scientific Committee of Interdisciplinary Institute IISE (University Paris 13).

Member of American Nano Society.

Member of International Sol‐Gel Society.

Member de Erwin Schrödinger Society for Nanosciences (ESG‐Nano).

Coordinator of European project CfP‐AWP17‐ENR‐UT‐01 (2017‐18), EUROfusion, H2020.

Member of WPMAT EUROfusion, group Functional Materials.

Member of Steering Committee of EU‐project TEMPUS “Econano”, 2014‐2015.

Coordinator of WG D19/006/02, COST Chemistry Action "Chemical Functionality Specific to the

Nanometer Scale", 2002‐2005.

Expert of Agencies: ANR (France), PT‐DLR (Germany), RSF (Russia), FNRS (Belgium), etc.

Reviewer of scientific journals (Nature Nanomaterials, Advanced Functional Materials, ACS journals

publishing group, Elsevier journals publishing group, etc).

Chairman, Member of Sci. Committees of International and National conferences and meetings.

Supervisor of 28 PhD works.