Untitled

Baechi, D.; Buser, R.A.; Dual, Jürg

doi:10.1023/a:1010009226718

Cited by 3 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, decreasing the size brings disadvantages such as toxicity 1 and/or manipulation difficulties. 2 Nanoparticles are interesting, not only for their unique properties, but also for their potential to be used as nanobuilding blocks. Interest in nanobuilding blocks is growing as they have been recognized to be basic units for the elaboration of hierarchically-organized materials by self-assembling processes.…”

Section: Introductionmentioning

confidence: 99%

Laponite and hybrid surfactant/laponite particles processed as spheres by spray-drying

2009

View full text Add to dashboard Cite

Laponite elementary disc crystals dispersed in water in the presence or absence of non-ionic Brij58 surfactant have been used as nanobuilding blocks to form laponite and laponite/surfactant spherical particles by spray-drying. The size distribution of the spherical spray-dried particles ranges from 70 to 1000 nm (average size about 220 nm). Although raw laponite (RL) was almost totally exfoliated in water, the spray-dried spherical particles were found partially delaminated and stable when spread into water. Based on a full characterization by several techniques such as dynamic light scattering, scanning and transmission electron microscopies, X-ray diffraction, thermal analyses, nitrogen volumetric sorption and solid-state multi-nuclear NMR studies, a mechanism has been proposed to explain the formation of the spherical micron size particles: a face-to-face and edge-to-edge stacking of the elementary disc crystals leads to the formation of few-layer laponite platelets that aggregate within the restricted volume of water droplets during the drying stage. In the presence of Brij58, elementary disc crystals are covered by surfactant molecules adsorbed on their surface. As a consequence, surfactant molecules fill the interlayer space to form spherical Brij58/laponite nanocomposite particles. These spray-dried laponite and Brij58/laponite spherical particles present a high potential for sorption applications. IntroductionDuring recent decades the interest towards nanoparticles has mainly increased because of their properties such as surface reactivity that are different from those of the bulk material. However, decreasing the size brings disadvantages such as toxicity 1 and/or manipulation difficulties. 2 Nanoparticles are interesting, not only for their unique properties, but also for their potential to be used as nanobuilding blocks. Interest in nanobuilding blocks is growing as they have been recognized to be basic units for the elaboration of hierarchically-organized materials by self-assembling processes. 3,4 As there are various types of inorganic nanobuilding blocks and several ways to link them together, the resulting materials are numerous. 5 Moreover, this strategy allows a better control of the structure of the final material and offers an easier shape modelling.Materials resulting from nanobuilding blocks can be used in different application domains such as catalysts, 6,7 varnishes and adhesives; 8 or marginally in two-terminal circuit device nano-applications 9,10 or non-volatile random access memory. 11 Most nanobuilding units are nanocrystals that can be classified according to their one-, two-or three-dimensionalities 12 such as tubes, wires, plates, 13-15 multipods, crosses, stars. 16 These different dimensionalities lead to materials with various morphologies such as films, 17 fibres, 18,19 mushroom-like particles, 20 spheres, 21,22 or monoliths. 23 In order to control the self-assembly process of nanoobjects for the elaboration of hierarchically organized materials, several techniques have been i...

show abstract

Section: Introductionmentioning

confidence: 99%

Laponite and hybrid surfactant/laponite particles processed as spheres by spray-drying

2009

View full text Add to dashboard Cite

show abstract

“…Nanocolloidal technology holds great potential for many bottom-up-assembled materials and devices, including low-power circuits, 1,2 superstrong ceramics, 3 NEMS robotics, 4 optical imaging, [5][6][7] biosensors, 8,9 barcodes, 10 "colloidal molecules", 11 and drug delivery. 12,13 A key challenge in assembling these devices is controlling the stability and assembly of the particles, and both depend on interparticle forces.…”

Section: Introductionmentioning

confidence: 99%

Force Measurements between Sub-100 nm Colloidal Particles

et al. 2006

View full text Add to dashboard Cite

Interparticle forces have been measured between polystyrene latex particles as small as 85 nm in diameter in KCl solutions. A variant of the differential electrophoresis technique, called particle force light scattering (PFLS), was used to measure forces between Brownian, nearly touching particles for diameters from 4500 nm down to 85 nm. The forces, some less than 0.1 pN, matched to within a factor of 2 with predictions from depletion and DLVO theory.

show abstract