New Functional Materials Based on Self-Assembling Organogels: From Serendipity towards Design

Jh, van Esch; Feringa, BL

doi:10.1002/1521-3773(20000703)39:13<2263::aid-anie2263>3.3.co;2-m

Cited by 214 publications

(257 citation statements)

References 5 publications

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“…In fact, self-assembling organogels are evolving as new functional materials based on supramolecular chemistry [27], and they are discussed in the light of self assembling nanofabrication strategies in Sections 4 and 5. Without such crosslinking-based or supramolecular assembling-based entanglements, polymers would react to stimuli by cycling between the sol and the gel states, rather than oscillating between the swollen and the collapsed states.…”

Section: Introductionmentioning

confidence: 99%

Smart polymeric gels: Redefining the limits of biomedical devices

Chaterji

Kwon

Park

2007

Progress in Polymer Science

559

364

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This review describes recent progresses in the development and applications of smart polymeric gels, especially in the context of biomedical devices. The review has been organized into three separate sections: defining the basis of smart properties in polymeric gels; describing representative stimuli to which these gels respond; and illustrating a sample application area, namely, microfluidics. One of the major limitations in the use of hydrogels in stimuli-responsive applications is the diffusion rate limited transduction of signals. This can be obviated by engineering interconnected pores in the polymer structure to form capillary networks in the matrix and by downscaling the size of hydrogels to significantly decrease diffusion paths. Reducing the lag time in the induction of smart responses can be highly useful in biomedical devices, such as sensors and actuators. This review also describes molecular imprinting techniques to fabricate hydrogels for specific molecular recognition of target analytes. Additionally, it describes the significant advances in bottom-up nanofabrication strategies, involving supramolecular chemistry. Learning to assemble supramolecular structures from nature has led to the rapid prototyping of functional supramolecular devices. In essence, the barriers in the current performance potential of biomedical devices can be lowered or removed by the rapid convergence of interdisciplinary technologies.

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Section: Introductionmentioning

confidence: 99%

Smart polymeric gels: Redefining the limits of biomedical devices

Chaterji

Kwon

Park

2007

Progress in Polymer Science

559

364

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“…Recently, the use of low-molecularweight gelators as the organic templates for templatedirected synthesis have been investigated [18][19][20][21][22][23]. Because the low-molecular-weight gelators produce various nanostructures such as nanofibers, nanoribbons, nanorods, and nanoparticles in the organogels, many lowmolecular-weight gelators have been recognized as one of the good organic templates [24][25][26][27][28][29][30][31][32]. We reported the fabrication of nanostructured TiO2 using low-molecularweight gelators ; e.g., TiO2 nanotubes, nanoparticles and helical TiO2 nanotubes [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Activity of Titanium Oxide Nano-Networks Fabricated through Organogel Route Using L-Isoleucine-Based Gelator

2014

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“…1,2 The LMWGs construct supramolecular 3D networks consisting of nanofibrous assemblies of amphiphilic molecules. [3][4][5][6][7][8][9] Noncovalent interactions such as hydrogen-bonding, van der Waals, p-p and electrostatic interactions function as driving forces to stabilize these supramolecular nanostructures. 10,11 Polymerization of constituent molecules in supramolecular selfassemblies 12 will provide stable covalent assemblies.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular nanofiber formation from commercially available arginine and a bola-type diacetylenic diacid via hydrogelation

Mukai

Kogiso

Aoyagi

et al. 2012

Polym J

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A diacetylenic-acid arginine salt gelated water. The supramolecular structure and optical properties of the resultant hydrogel were examined by optical microscopy, electron microscopy, X-ray diffraction and ultraviolet (UV)-absorption and circular dichroism (CD) spectroscopies. Microscopic images showed that 10, 12-docosadiynedioic acid arginine salt formed a fibrous structure. X-ray diffraction and nuclear magnetic resonance measurements indicated guanidinium-carboxylate interaction. Upon UV irradiation, the gel polymerized to diacetylene oligomers, with a concomitant color change from white to orange. After the removal of arginine, CD spectra indicated that the diacetylene oligomers maintained chirality. Polymer Journal (2012) 44, 646-650; doi:10.1038/pj.2012.46; published online 4 April 2012Keywords: arginine; diacetylene; hydrogel; polymerization; self-assembly INTRODUCTION Low-molecular-weight gelators (LMWGs) have attracted much interest because of their unique features and potential applications as new soft materials. 1,2 The LMWGs construct supramolecular 3D networks consisting of nanofibrous assemblies of amphiphilic molecules. [3][4][5][6][7][8][9] Noncovalent interactions such as hydrogen-bonding, van der Waals, p-p and electrostatic interactions function as driving forces to stabilize these supramolecular nanostructures. 10,11 Polymerization of constituent molecules in supramolecular selfassemblies 12 will provide stable covalent assemblies. In particular, polymerization of the LWMGs with diacetylene groups has been actively investigated, [13][14][15][16] as simple photoirradiation induces polymerization or oligomerization if they arrange and align in a good order. The connection of amide, aromatic or ionic groups to diyne motives through synthetic derivation enables one to attain appropriate molecular arrangement to the polymerization. In most cases, however, the derivation requires several tedious steps. Moreover, a careful handling is necessary at every step to avoid photopolymerization of the synthetic intermediates under light.We have widely investigated the supramolecular nanostructures self-assembled from bola-amphiphiles. [16][17][18][19][20][21][22][23] For example, we previously reported that butadiyne 1-glucosamide connected bolaamphiphiles self-assemble to form nanofibers, and polymerization by photoirradiation causes the gelation of supramolecular networks in organic solvents. 16 In this synthesis, we always needed multistep derivation to attain the gelation.In the present work, we propose a new simple bola-type diacetylenic gelator. Inspired by the reports on gel-like systems of fatty acids and arginine, 24,25 we examined a salt of arginine and bola-type diacetylene diacid 10, 12-docosadiynedioic acid (DDA) for hydrogelation ( Figure 1). The salt gelator requires no multistep synthetic derivation. The hydrogel system showed formation of nanofibers and their stabilization by photo-oligomerization as well as chirality transfer to the nanofibers after the removal of the chiral amino acid. ...

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New Functional Materials Based on Self-Assembling Organogels: From Serendipity towards Design

Cited by 214 publications

References 5 publications

Smart polymeric gels: Redefining the limits of biomedical devices

Smart polymeric gels: Redefining the limits of biomedical devices

Photocatalytic Activity of Titanium Oxide Nano-Networks Fabricated through Organogel Route Using L-Isoleucine-Based Gelator

Supramolecular nanofiber formation from commercially available arginine and a bola-type diacetylenic diacid via hydrogelation

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