Publications de Stefan Guldin | EPFL Graph Search

Quantifying the Solution Structure of Metal Nanoclusters Using Small-Angle Neutron Scattering

Francesco Stellacci, Stefan Guldin, Zhi Luo, Ye Yang, Huayan Yang

Metal nanoclusters are a unique class of synthetic material, as their crystal structures can be resolved using X-ray diffraction, and their chemical formula can be precisely determinated from mass spectroscopy. However, a complete structure characterizatio ...

Wiley-VCH Verlag GmbH2022

Microfluidics of binary liquid mixtures with temperature-dependent miscibility

Stefan Guldin, Esther Amstad

Liquid-liquid microfluidic systems rely on the intricate control over the fluid properties of either miscible or immiscible mixtures. Herein, we report on the use of partially miscible binary liquid mixtures that lend their microfluidic properties from a h ...

ROYAL SOC CHEMISTRY2020

Comparative characterisation of non-monodisperse gold nanoparticle populations by X-ray scattering and electron microscopy

Francesco Stellacci, Stefan Guldin, Zhi Luo, Ye Yang, Suiyang Liao, Runzhang Qi

Accurate nanoparticle size determination is essential across various research domains, with many functionalities in nanoscience and biomedical research being size-dependent. Although electron microscopy is capable of resolving a single particle down to the ...

2020

Multidimensional Characterization of Mixed Ligand Nanoparticles Using Small Angle Neutron Scattering

Francesco Stellacci, Quy Ong Khac, Stefan Guldin, Zhi Luo, Ye Yang

The properties of ligand protected gold nanoparticles are determined by the synergistic interplay of their structural components, including the metal core, the ligand shell, and the solvation layer. However, the simultaneous characterization of all these c ...

AMER CHEMICAL SOC2019

Probing the interaction of nanoparticles with small molecules in real time via quartz crystal microbalance monitoring

Nikolaos Nianias, Stefan Guldin, Ye Yang, Runzhang Qi

Despite extensive advances in the field of molecular recognition, the real-time monitoring of small molecule binding to nanoparticles (NP) remains a challenge. To this end, we report on a versatile approach, based on quartz crystal microbalance with dissip ...

2019

Phase behaviour and applications of a binary liquid mixture of methanol and a thermotropic liquid crystal

Francesco Stellacci, Stefan Guldin, Ye Yang, Maximiliano Jesus Jara Fornerod

2018

pH-Mediated molecular differentiation for fluorimetric quantification of chemotherapeutic drugs in human plasma

Francesco Stellacci, Stefan Guldin, Ye Yang

Royal Society of Chemistry2018

Freestanding Ultrathin Nanoparticle Membranes Assembled at Transient Liquid-Liquid Interfaces

Francesco Stellacci, Sergio Allegri, Stefan Guldin, Zhi Luo, Benjamin Timothée Nicolas Le Ouay

A synthetic route is presented for the realization of ultrathin freestanding nanoparticle membranes that are built of gold nanoparticles protected with trimethoxysilane-bearing ligands. The mechanism relies on interfacial assembly in an oil-water mixture. ...

Wiley-Blackwell2016

Phase transfer based chemical sensing

Francesco Stellacci, Stefan Guldin, Yang Ye

The present invention relates to a phase transfer based chemical sensing, specifically to a method for selective separation, detection and quantification of a polycyclic organic compound in a sample and a method for selective extraction of a polycyclic org ...

2016

High-Surface-Area Porous Platinum Electrodes for Enhanced Charge Transfer

Michael Graetzel, Marcel Roland Schreier, Francesco Stellacci, Aswani Yella, Yelin Hu, Morgan Mertens Stefik, Stefan Guldin

Cobalt-based electrolytes are highly tunable and have pushed the limits of dye-sensitized solar cells, enabling higher open-circuit voltages and new record efficiencies. However, the performance of these electrolytes and a range of other electrolytes suffe ...

Wiley-V C H Verlag Gmbh2014

Soft matter design principles for inorganic photonic nanoarchitectures in photovoltaics, colorimetric sensing and self-cleaning antireflective coatings

Stefan Guldin

The self-assembly of soft matter, such as block copolymers or colloids, allows fine tuning of structure formation on the 10 - 500 nm length scale and therefore enables the design of materials with tunable optical response. We present strategies on how to e ...

Spie-Int Soc Optical Engineering2014

Lessons Learned: From Dye-Sensitized Solar Cells to All-Solid-State Hybrid Devices

Henry Snaith, Stefan Guldin

The field of solution-processed photovoltaic cells is currently in its second spring. The dye-sensitized solar cell is a widely studied and longstanding candidate for future energy generation. Recently, inorganic absorber-based devices have reached new rec ...

Wiley-V C H Verlag Gmbh2014

Layer-by-Layer Formation of Block-Copolymer-Derived TiO2 for Solid-State Dye-Sensitized Solar Cells

Henry Snaith, Morgan Mertens Stefik, Stefan Guldin

Wiley-Blackwell2011

Dye-Sensitized Solar Cell Based on a Three-Dimensional Photonic Crystal

Nicolas Tétreault, Stefan Guldin

We present a material assembly route for the manufacture of dye-sensitized solar cells, coupling a high-surface mesoporous layer to a three-dimensional photonic crystal (PC) Material synthesis aided by self-assembly on two length scales provided electrical ...

American Chemical Society2010