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Versatile Self-Assembly of Water-Soluble Thiol-Capped CdTe Quantum Dots: External Destabilization and Internal Stability of Colloidal QDs.
We report on the versatile self-assembly of water-soluble thiol-capped CdTe quantum dots (QDs), nanoparticles (NPs), or nanocrystals induced by l-cysteine (l-Cys). Major efforts are focused on the control of the self-organization of QDs into nanosheets (NSs), for example, by altering the solution pH...
Functionalization of bolalipid nanofibers by silicification and subsequent one-dimensional fixation of gold nanoparticles.
We describe the successful stabilization of bolalipid nanofibers by sol-gel condensation (silicification) of tetraethoxysilane (TEOS) or 3-mercaptopropyltriethoxysilane (MP-TEOS), respectively, onto the nanofibers. The conditions for an effective and reproducible silicification reaction were determi...
A new route to fabricate large-area, compact Ag metal mesh films with ordered pores.
We have developed a two-step chemical deposition method to obtain compact porous Ag MMFs. By the separation of the nucleation and growth stages of the metal in the two-step deposition processes, the overgrowth of the metals to form randomly aggregated irregular metal particles can be overcome. Hexag...
Ag-nanoparticle-loaded mesoporous silica: spontaneous formation of Ag nanoparticles and mesoporous silica SBA-15 by a one-pot strategy and t...
A facile one-step method was proposed for the successful synthesis of Ag-nanoparticle-loaded mesoporous silica SBA-15 composites, where silver ions and their corresponding reductant aniline were added in the traditional synthetic system of mesoporous silica SBA-15 containing P123 as...
Boronic acid-protected gold clusters capable of asymmetric induction: spectral deconvolution analysis of their electronic absorption and mag...
We then find that fructose-induced chiroptical response is explained in terms of the deconvoluted spectra experimentally obtained. We believe this spectral analysis is expected to benefit better understanding of the electronic states and the origin of the optical activity in chiral metal clusters....
Interplay between subsurface ordering, surface segregation, and adsorption on Pt-Ti(111) near-surface alloys.
We have studied the subsurface ordering of Pt/Pt-Ti(111) surface alloys and the effect of this ordering on segregation and adsorption behavior. The clusters included in the CE are optimized by a genetic algorithm to better describe the interactions between Pt and Ti atoms in the subsurface layer. Si...
Differential dynamic microscopy for anisotropic colloidal dynamics.
We develop the theory for applying DDM to probe the dynamics of anisotropic colloidal samples such as various ordered phases, or particles interacting with an external field. The q-dependent dynamics can be measured in any direction in the image plane. We demonstrate the method on a dilute aqueous d...
Effect of dehydration on the interfacial water structure at a charged polymer surface: negligible χ(3) contribution to sum frequency generat...
Interfacial water structure at charged surfaces plays a key role in many physical, chemical, biological, environmental, and industrial processes. Understanding the release of interfacial water from the charged solid surfaces during dehydration process may provide insights into the me...
Dissolution of ZnO nanoparticles at circumneutral pH: a study of size effects in the presence and absence of citric acid.
Understanding size-dependent processes, including dissolution, of engineered nanoparticles is essential in addressing the potential environmental and health impacts of these materials as well as their long-term stability. In this study, experimental measurements of size-dependent dissolution of well-...
High internal phase emulsions: catastrophic phase inversion, stability, and triggered destabilization.
We find that the oil volume fraction required for catastrophic inversion exhibits a linear correlation with the oil-water-solid surface contact angle. W/o high internal phase emulsions (HIPEs) prepared in this way contain water drops of diameters in the range 10-100 μm; emulsion drop size depends o...