Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

Partnerzy

Hui Yang

South China Normal University (CN)

Ostatnie publikacje
1.  Yang H., Akinoglu E.M., Lisi F., Wu L., Shen S., Jin M., Zhou G., Giersig M., Shui L., Mulvaney Paul ., A versatile strategy for loading silica particles with dyes and quantum dots, Colloid and Interface Science Communications, ISSN: 2215-0382, DOI: 10.1016/j.colcom.2022.100594, Vol.47, No.100594, pp.1-9, 2022

Streszczenie:
A simple and inexpensive method for the controlled loading of silica particles with dyes and nanocrystals is presented. Polydiallyldimethylammonium chloride is used as a positively charged bridge to facilitate electrostatic adsorption of negatively charged dyes onto negatively charged silica microspheres. The particles are subsequently coated with a further silica shell to protect the dyes against chemical degradation and leakage and this shell affords a unform particle surface independent of its doping. This encapsulation method is highly versatile and can be extended to doping with semiconductor nanocrystals, which we demonstrate using CdSe/ZnS core/shell quantum dots. The synthesis steps and end products are characterized with electron microscopy, optical spectroscopy and the electrokinetic potential of the colloidal suspensions. We show that the particles adapt the optical properties of their dopants and are resistant to degradation, dopant leakage and show reasonable emission even at acidic pH values due to the protective shell.

Słowa kluczowe:
Silica particles, Dye, Quantum dot, Polydiallyldimethylammonium chloride, Doping

Afiliacje autorów:
Yang H. - South China Normal University (CN)
Akinoglu E.M. - University of Melbourne (AU)
Lisi F. - inna afiliacja
Wu L. - inna afiliacja
Shen S. - inna afiliacja
Jin M. - South China Normal University (CN)
Zhou G. - South China Normal University (CN)
Giersig M. - IPPT PAN
Shui L. - South China Normal University (CN)
Mulvaney Paul . - University of Melbourne (AU)
70p.
2.  Chen R., Xue Yafei ., Xu X., Yang H., Qiu T., Shui Lingling ., Wang Xin ., Zhou G., Giersig M., Pidot S., Hutchison J.A ., Akinoglu E.M., Lithography-free synthesis of periodic, vertically-aligned, multi-walled carbon nanotube arrays, NANOTECHNOLOGY, ISSN: 0957-4484, DOI: 10.1088/1361-6528/ac345a, Vol.33, No.065304 , pp.1-9, 2021

Streszczenie:
Until now, the growth of periodic vertically aligned multi-walled carbon nanotube (VA-
MWCNT) arrays was dependent on at least one lithography step during fabrication. Here, we demonstrate a lithography-free fabrication method to grow hexagonal arrays of self-standing VA-MWCNTs with tunable pitch and MWCNT size. The MWCNTs are synthesized by plasma enhanced chemical vapor deposition (PECVD) from Ni catalyst particles. Template guided dewetting of a thin Ni film on a hexagonally close-packed silica particle monolayer provides periodically distributed Ni catalyst particles as seeds for the growth of the periodic MWCNT arrays. The diameter of the silica particles directly controls the pitch of the periodic VA-MWCNT arrays from 600 nm to as small as 160 nm. The diameter and length of the individual MWCNTs can also be readily adjusted and are a function of the Ni particle size and PECVD time. This unique method of lithography-free growth of periodic VA-MWCNT arrays can be utilized for the fabrication of large-scale biomimetic materials

Słowa kluczowe:
periodic, ithography free, nanofabrication, template guided, vertically-aligned multi- walled carbon nanotubes, self-standing

Afiliacje autorów:
Chen R. - inna afiliacja
Xue Yafei . - South China Normal University (CN)
Xu X. - inna afiliacja
Yang H. - South China Normal University (CN)
Qiu T. - inna afiliacja
Shui Lingling . - South China Normal University (CN)
Wang Xin . - inna afiliacja
Zhou G. - South China Normal University (CN)
Giersig M. - IPPT PAN
Pidot S. - inna afiliacja
Hutchison J.A . - inna afiliacja
Akinoglu E.M. - University of Melbourne (AU)
100p.
3.  Yang H., Akinoglu E.M., Guo L., Jin M., Zhou G., Giersig M., Shui L., Mulvaney P., A PTFE helical capillary microreactor for the high throughput synthesis of monodisperse silica particles, Chemical Engineering Journal, ISSN: 1385-8947, DOI: 10.1016/j.cej.2020.126063, Vol.401, pp.126063-1-29, 2020

Streszczenie:
We propose a simple and inexpensive SiO2 submicron particle synthesis method based on a PTFE helical capillary microreactor. The device is based on Dean flow mediated, ultrafast mixing of two liquid phases in a microfluidic spiral pipe. Excellent control of particle size between 100 nm and 600 nm and narrow polydispersity can be achieved by controlling the device and process parameters. Numerical simulations are performed to determine the optimal device dimensions. In the mother liquor the silica particles exhibit zeta potentials < -60 mV, rendering them very stable even at high particle volume fractions. The current device typically produces around 0.234 g/h of the silica particles.

Słowa kluczowe:
SiO2 particle synthesis, continuous flow synthesis, helical capillary microreactor

Afiliacje autorów:
Yang H. - South China Normal University (CN)
Akinoglu E.M. - University of Melbourne (AU)
Guo L. - South China Normal University (CN)
Jin M. - South China Normal University (CN)
Zhou G. - South China Normal University (CN)
Giersig M. - IPPT PAN
Shui L. - South China Normal University (CN)
Mulvaney P. - University of Melbourne (AU)
200p.

Kategoria A Plus

IPPT PAN

logo ippt            ul. Pawińskiego 5B, 02-106 Warszawa
  +48 22 826 12 81 (centrala)
  +48 22 826 98 15
 

Znajdź nas

mapka
© Instytut Podstawowych Problemów Techniki Polskiej Akademii Nauk 2024