Aqueous Viscosity Enhancement through Helical Inclusion Complex Cross-Linking of a Hydrophobically-Modified, Water-Soluble, Cationic Cellulose Ether by Amylose

Gruber, James V.; Konish, Peter N.

doi:10.1021/ma970554v

Cited by 22 publications

(17 citation statements)

References 25 publications

(46 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although CA-4 and 18C-6 have a much higher r (CA-4, 56.59; 18C-6, 37.30 nm À2 ) than CA-6 (13.23 nm À2 ), their cavity diameters (CA-4, 0.30 nm 35 and 18C-6, 0.26-0.32 nm 37 ) are too small to allow the passage of Ga atoms. In contrast, CDs have appropriate cavity diameters (a-, 0.47-0.53 nm; b-, 0.60-0.65 nm and g-CD, 0.95 nm 38,39 ), but they have much lower r values (a-, 7.17; b-, 7.52; and g-CD, 6.65 nm À2 ) than CA-6. This molecule-atom interaction mechanism is supported by XPS techniques.…”

Section: Molecule-atom Interaction Between Ga and Ca-6mentioning

confidence: 96%

Distinctive electronic structure, unusual magnetic properties and large enhancement in SERS of 1D gallium nanoribbons achieved by doping calix[6]arene

et al. 2012

View full text Add to dashboard Cite

The present work provides a novel route for forming one-dimensional (1D) gallium (Ga) nanoribbon materials with a host molecule calix[6]arene (CA-6) as a template by a facile, one-step and low temperature chemical bath method. Field-emission scanning electron microscopy and transmission electron microscopy showed that the uniform 1D Ga nanoribbon material (Ga-a) can be constructed only in the presence of CA-6, and the formation of ribbon structures is highly dependent on doping ratios and deposition times. Our data indicate that the unusual effect of CA-6 is due to a combination of two factors: a high density of OH groups in the outer surface of its cavity and an appropriate cavity diameter. Especially, the uniform 1D Ga nanoribbon material exhibits a distinct electronic structure and very rare magnetic behaviour when compared to those 3D Ga materials obtained by means of other host molecules: calix[4]arene, g-cyclodextrin and 18-crown-6. For example, of all the Ga materials, the uniform 1D nanoribbon material has the lowest electron density of Ga core levels in light of X-ray photoelectron spectroscopy analysis. This result suggests that there is a stronger molecule-atom interaction between Ga atoms and CA-6 molecules compared with those in other host-guest systems. More importantly, the uniform 1D Ga nanoribbon material exhibits a magnetic transformation from a diamagnetic to a paramagnetic state under the influence of an applied field, which is completely different from those of all the 3D Ga materials and all the irregular Ga nanoribbon materials. Such a transformation is novel in metals and particularly useful in the chemistry of materials since it allows dramatic modifications of magnetic properties of metal nanocrystals. Finally, a strong surfaceenhanced Raman scattering of the uniform 1D Ga nanoribbon material has been observed for organic molecules adsorbed on their surface. Taken together, we believe this work opens a new channel for development of 1D metal-based nanomaterials.

show abstract

Section: Molecule-atom Interaction Between Ga and Ca-6mentioning

confidence: 96%

Distinctive electronic structure, unusual magnetic properties and large enhancement in SERS of 1D gallium nanoribbons achieved by doping calix[6]arene

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Beside the micelle-like type of associative behavior, a polymer that shows a coil-helix transition can act as a host molecule in inclusion complexes. This has been reported for amylose in blends with hydrophobically modified cellulose ethers [14]. A combination of hydrophobically modified, water-soluble, cationic cellulose ether and amylose dissolved together in water at high temperature and carefully cooled yields a solution with a viscosity higher than that of either polymer alone [14].…”

Section: Introductionmentioning

confidence: 67%

“…This has been reported for amylose in blends with hydrophobically modified cellulose ethers [14]. A combination of hydrophobically modified, water-soluble, cationic cellulose ether and amylose dissolved together in water at high temperature and carefully cooled yields a solution with a viscosity higher than that of either polymer alone [14]. This enhancement has been attributed to the formation of a cross-linked network where amylose forms a helical clathrate with the hydrophobic groups on the cellulose.…”

Section: Introductionmentioning

confidence: 72%

The Interaction Between Surfactants and 2‐Hydroxy‐3‐(N,N‐dimethyl‐N‐dodecylammonium)‐propyloxy Starches

Jonhed

Järnström

2006

Starch Stärke

View full text Add to dashboard Cite

The phase behavior of temperature-responsive hydrophobically modified starches and the interaction between oxidized potato amylose and hydrophobically modified potato amylopectin have been investigated by rheology, turbidity measurements and differential scanning calorimetry. When oxidized amylose was mixed with hydrophobically modified amylopectin, a viscosity peak was observed, indicative of a guest-host interaction between the oxidized amylose and the hydrophobically modified amylopectin. A series of oxidized and hydrophobically modified potato starches were investigated in the presence of an anionic and cationic surfactant. A coil-helix transition of the investigated starches was observed in the presence of surfactant, with the exception of a cationic surfactant combined with a hydrophobically modified zwitterionic starch of high positive net charge. The destabilizing mechanism (the phase separation) of the hydrophobically modified starches was studied as well as the difference in stabilizing capacity between the investigated cationic and anionic surfactants.

show abstract

“…Hydrophobically modified cellulose derivates have been investigated extensively [11][12][13][14][15][16][17][18][19][20]. Even the substitution degree of (HMDS) (AR), trimethylsilyl chloride (TMCS) (AR), stannous octoate [Sn(Oct) 2 ], dimethylformamide (DMF) and other reagents were purchased from National Drug Co. Ltd. (Shanghai) and used without purification.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and solution behavior of poly(ɛ-caprolactone) grafted hydroxyethyl cellulose copolymers

Jiang

Wang

Sun

et al. 2011

International Journal of Biological Macromolecules

View full text Add to dashboard Cite

Aqueous Viscosity Enhancement through Helical Inclusion Complex Cross-Linking of a Hydrophobically-Modified, Water-Soluble, Cationic Cellulose Ether by Amylose

Cited by 22 publications

References 25 publications

Distinctive electronic structure, unusual magnetic properties and large enhancement in SERS of 1D gallium nanoribbons achieved by doping calix[6]arene

Distinctive electronic structure, unusual magnetic properties and large enhancement in SERS of 1D gallium nanoribbons achieved by doping calix[6]arene

The Interaction Between Surfactants and 2‐Hydroxy‐3‐(N,N‐dimethyl‐N‐dodecylammonium)‐propyloxy Starches

Synthesis and solution behavior of poly(ɛ-caprolactone) grafted hydroxyethyl cellulose copolymers

Contact Info

Product

Resources

About