Molecular control over colloidal assembly

Gerth, Marieke; Voets, Ilja K.

doi:10.1039/c6cc09985h

Cited by 36 publications

(38 citation statements)

References 159 publications

(249 reference statements)

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“…Assembling nanoparticles (NPs) into superlattices with specific symmetries is crucial for applications such as catalysis, [1][2][3] optical devices, [4,5] sensors, [6][7][8] and energy storage. [9] Although there has been considerable progress in assembling 2D and 3D superlattices of metallic and semiconductor NPs, [10][11][12][13][14][15][16][17][18][19] the challenge of up-scaling and stabilizing these crystals still remains.…”

Section: Nanoparticle Self-assemblymentioning

confidence: 99%

“…In solution based methods of NP assembly a surface ligand, covalently bound to a NP, interacts with neighboring ligands via noncovalent interactions such as hydrogen bonding . While there is a plethora of studies reporting structural properties of NPs by DNA‐mediated assembly, there is a relative dearth of studies on the structure of NP networks obtained by covalent crosslinkers, such as dithiol molecules, which are an obvious choice for linking gold nanoparticles (AuNPs).…”

mentioning

confidence: 99%

“…[21][22][23][24] In solution based methods of NP assembly a surface ligand, covalently bound to a NP, interacts with neighboring ligands via noncovalent interactions such as hydrogen bonding. [1,3,20,[25][26][27] While there is a plethora of studies reporting structural properties of NPs by DNAmediated assembly, [12][13][14] there is a relative dearth of studies on the structure of NP networks obtained by covalent crosslinkers, such as dithiol molecules, which are an obvious choice for linking gold nanoparticles (AuNPs). An advantage of short dithiol ligands (with a length of a few nanometers) over the longer linkers (such as those used in DNA-mediated assembly) is the very short interparticle distance they accommodate leads to a higher plasmon coupling and hence has potential applications in plasmonic effective medium metamaterials [28,29] and FRET devices.…”

mentioning

confidence: 99%

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Ordered Networks of Gold Nanoparticles Crosslinked by Dithiol‐Oligomers

Nayak

Horst

Zhang

et al. 2018

Part & Part Syst Charact

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Controlled aggregation of nanoparticles into superlattices is a grand challenge in material science, where ligand based self‐assembly is the dominant route. Here, the self‐assembly of gold nanoparticles (AuNPs) that are crosslinked by water soluble oligo‐(ethylene glycol)‐dithiol (oEG‐dithiol) is reported and their 3D structure by small angle X‐ray scattering is determined. Surprisingly, a narrow region is found in the parameter space of dithiol linker‐length and nanoparticle size for which the crosslinked networks form short‐ranged FCC crystals. Using geometrical considerations and numerical simulations, the stability of the formed lattices is evaluated as a function of dithiol length and the number of connected nearest‐neighbors, and a phase diagram of superlattice formation is provided. Identifying the narrow parameter space that allows crystallization facilitates focused exploration of linker chemical composition and medium conditions such as thermal annealing, pH, and added solutes that may lead to superior and more robust crystals.

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Section: Nanoparticle Self-assemblymentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Ordered Networks of Gold Nanoparticles Crosslinked by Dithiol‐Oligomers

Nayak

Horst

Zhang

et al. 2018

Part & Part Syst Charact

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“…DNA-mediated colloidal self-assembly. Also in the case of colloidal particles, hybridization of DNA filaments, tethered to the surface, has become a prominent means to mediate interactions and to assemble ordered and disordered soft materials [29]. A major goal is the spatial and temporal control of the structure of colloidal materials, to reversibly tailor their optical and mechanical properties.…”

Section: Dna-based Dynamic Materialsmentioning

confidence: 99%

Control and optical mapping of mechanical transitions in polymer networks and DNA-based soft materials

Zanchetta

2019

Current Opinion in Colloid & Interface Science

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Complex mechanical changes in response to an external trigger are pervasive in natural soft materials and often sought for applications. Be it the reversible stiffening of sea cucumber, the failure of a polymeric or colloidal gel under load, or the dissolution of a biosensing hydrogel upon target binding, mechanical transitions are typically enabled, and critically affected, by heterogeneous structures and reversible bonds. New possibilities to monitor evolving properties and to gain access to stress propagation with temporal and spatial resolution are being disclosed by mechanochromic molecules and molecular complexes, which transduce a mechanical stress into a light signal and act as built-in stress reporters. I will review recent strategies and identify future directions for the design of mechanically responsive soft networks and for their optical mapping, focusing particular attention on the emerging class of hydrogels based on DNA self-assembly.

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“…Ideally, the tethered motifs should be easy to synthesize, responsive, externally addressable and provide directional, dynamic and specific bonding within the assemblies. Moreover, to facilitate colloidal assembly, a precise control between the interplay of non-specific surface forces (attractive and/or repulsive) is crucial 19 .…”

Section: Introductionmentioning

confidence: 99%

Light induced assembly and self-sorting of silica microparticles

Vilanova

Feijter

Teunissen

et al. 2018

Sci Rep

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To tailor the properties of colloidal materials, precise control over the self-assembly of their constituents is a prerequisite. Here, we govern the assembly of silica particles by functionalization with supramolecular moieties which interact with each other via directional and reversible hydrogen bonding. Through a generally applicable synthesis protocol, two different types of self-complementary hydrogen bonding moieties, BTA-and UPy-derivatives, are anchored to silica particles. Their selfassembly is initiated by the UV-induced removal of a photolabile protecting group, allowing the formation of hydrogen bonds between tethered molecules. The light-induced assembly of BTA-and UPy-decorated colloids in single-component dispersions and colloidal self-sorting in mixed dispersions is studied. Furthermore, we demonstrate that UPy-colloids can dissasemble upon addition of traces of a competitive binder (NaPy). This work provides further insight into the utility of supramolecular handles to orchestrate the assembly of micron-sized colloids via non-oligonucleotide hydrogen-bonding units.The ability to control molecular self-assembly via non-covalent interactions is an emerging bottom-up strategy to create complex metamaterials. In turn, well-defined molecular recognition can be used as a powerful tool to direct the assembly of micron-sized 1-3 colloids or even macroscopic objects 4 and create larger aggregated structures with emergent optical 5-7 , mechanical 8 or catalytic properties 9,10 . Molecular control over the assembly of micron-sized particles can be realized through particle surface-grafting of molecules exhibiting dipole-dipole 11,12 , metal coordination 13 , hydrophobic forces 14,15 and/or hydrogen bonding (H-bonding) [16][17][18] . Ideally, the tethered motifs should be easy to synthesize, responsive, externally addressable and provide directional, dynamic and specific bonding within the assemblies. Moreover, to facilitate colloidal assembly, a precise control between the interplay of non-specific surface forces (attractive and/or repulsive) is crucial 19 .A popular strategy in the field is the functionalization of colloids with complementary DNA strands 20,21 . Great advances in insight and structural complexity have been achieved in the last 20 years, enabling the assembly of colloids into both disordered and exotic ordered states 22,23 , in a reversible 22,24,25 or irreversible 26 manner and at the nano-27,28 and mesoscale 25,29 . Notwithstanding, DNA-technology has its limitations, such as high cost and restricted environmental conditions 27,30 because the strands only assemble in water at sufficiently high ionic strengths and at low temperature, precluding material synthesis and processing from organic solvents. Furthermore, up to now, only temperature has been used as external trigger of assembly, while recent advances towards light sensitive DNA-strands can be utilized in future to develop dual-responsive systems sensitive to both temperature and light 31 . A promising alternative strategy exploits...

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Molecular control over colloidal assembly

Cited by 36 publications

References 159 publications

Ordered Networks of Gold Nanoparticles Crosslinked by Dithiol‐Oligomers

Ordered Networks of Gold Nanoparticles Crosslinked by Dithiol‐Oligomers

Control and optical mapping of mechanical transitions in polymer networks and DNA-based soft materials

Light induced assembly and self-sorting of silica microparticles

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