Room-Temperature Super Hydrogel as Dye Adsorption Agent

Abstract

Supramolecular hydrogels were prepared in the mixtures of a chiral amphiphilic lithocholic acid (LCA) and a nonionic surfactant, dodecyldimethylamine oxide (C(12)DMAO), in water. With the addition of LCA to C(12)DMAO micellar solutions, a transition from micelles to gels occurs at room temperature. Hydrogels can form at very low concentrations (below 0.1 wt %), exhibiting a super gelation capability. The rheological measurements show a strong mechanical strength with an elastic modulus exceeding 5000 Pa and a yield stress exceeding 100 Pa. Microstructures determined by TEM, SEM, and AFM observations demonstrate that the gels are formed by intertwined helical fibrils. The formation of fibrils is induced by enormous cycles of units composed of two LCA molecules and four C(12)DMAO molecules driven by comprehensive noncovalent interaction, especially the hydrogen bonds produced in two reversed LCA molecules and the C(12)DMAOH(+)-C(12)DMAO pairs. The xerogels show excellent adsorption capability of the toxic dye with a maximum adsorption value of 202 mg·g(-1).

Biodegradable, multiple stimuli-responsive sodium deoxycholate–amino acids–NaCl mixed systems for dye delivery

“…39 The oscillatory rheological measurements show that the storage modulus (G΄) is higher than G˝ over the studied frequency range and exhibit an elastic dominant property, demonstrating the "solid-like" rheological property ( Figure 9A), which is general in gels. 23 The decrease of pH could significantly increase the mechanical strength of NaDC hydrogels. G΄ of hydrogel at pH = 4.00 was about 3-4 orders of magnitude higher than that at pH = 6.86 in the presence of 50 mmol L -1 Ala and 100 mmol L -1 NaCl (Figure 9 A).…”

Supra‐dendron Gelator Based on Azobenzene–Cyclodextrin Host–Guest Interactions: Photoswitched Optical and Chiroptical Reversibility

“…[1][2][3][4][5] Numerous soft, smartm aterials have been fabricated based on such responsive gels, which find many applications in various fields, such as biological substance release, [6][7][8] mechanical shape memory, [9,10] environmental remediation, [11][12][13][14] and so forth. [1][2][3][4][5] Numerous soft, smartm aterials have been fabricated based on such responsive gels, which find many applications in various fields, such as biological substance release, [6][7][8] mechanical shape memory, [9,10] environmental remediation, [11][12][13][14] and so forth.…”

Incorporation of graphene oxide into C12E4/C12mimBr hybrid lyotropic liquid crystal and its thermo-sensitive properties

“…The d-spacing of the lamellar lattice was calculated by d = 2π/q 1 (q 1 was the value of the first peak). 39 In addition, the addition of GO greatly increased the range of the linear viscoelastic region of both lamellar phase and hexagonal phase, and the shear modulus increased with the increasing of c GO . Rheological measurements can give macro properties of the system in real-time and then reflect the change of internal microstructure; thus, it is an important method to investigate LLC materials.…”