Skip to Content
Merck
  • Mechanistic insights into amplification of specific ion effect in water-nonaqueous solvent mixtures.

Mechanistic insights into amplification of specific ion effect in water-nonaqueous solvent mixtures.

The journal of physical chemistry. B (2013-01-29)
Lvdan Liu, Tao Wang, Chang Liu, Ke Lin, Yanwei Ding, Guangming Liu, Guangzhao Zhang
ABSTRACT

Ethylene glycol (EG) and hydrogen peroxide (H2O2) can act as both hydrogen-bond donors and acceptors in the formation of solvent complexes with water molecules. In the present work, we have systematically investigated the ion-specific lower critical solution temperature (LCST) behavior of poly(N-isopropylacrylamide) (PNIPAM) in H2O–EG and H2O–H2O2 mixtures. The results obtained from turbidity measurements show that the specific anion effect is amplified with the increasing molar fraction of EG (x(EG)) but is independent of the molar fraction of H2O2 (x(H2O2)). The studies of Raman spectra and differential scanning calorimetry indicate that the discrepancy in amplification of specific anion effect between H2O–EG and H2O–H2O2 mixtures is due to the difference in the anion–solvent complex interactions rather than the anion–polymer or solvent–polymer interactions. On the other hand, the specific cation effect can also be amplified with the increasing x(EG) but changes only slightly with the x(H2O2). The discrepancy in amplification of specific cation effect between the two types of solvent mixtures is attributed to the difference in the solvent–polymer interactions.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Poly(N-isopropylacrylamide), carboxylic acid terminated, average Mn 10,000
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25
Supelco
Ethylene glycol, Pharmaceutical Secondary Standard; Certified Reference Material
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25
Sigma-Aldrich
Poly(N-isopropylacrylamide), Mn ~40,000
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25
Supelco
Ethylene glycol solution, NMR reference standard, 80% in DMSO-d6 (99.9 atom % D), NMR tube size 5 mm × 8 in.
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25
Supelco
Ethylene glycol, analytical standard
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25
Sigma-Aldrich
Ethylene glycol, ReagentPlus®, ≥99%
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25
Sigma-Aldrich
Ethylene glycol, spectrophotometric grade, ≥99%
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25
Sigma-Aldrich
Ethylene glycol, BioUltra, ≥99.5% (GC)
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25
Sigma-Aldrich
Ethylene glycol, anhydrous, 99.8%
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25
Sigma-Aldrich
Poly(N-isopropyl acrylamide), NHS ester end functionalized, average Mn 5,000
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25
Sigma-Aldrich
Ethylene glycol 5 M solution
Sign Into View Organizational & Contract Pricing
SKUVendor SKUPack SizeAvailabilityPriceQuantity
12L-716-500MG500 mg
Ships in 21 days - from Aldrich Partner.
US$611.25
12L-716-1G1 g
Ships in 21 days - from Aldrich Partner.
US$1,222.50
12L-716-2G2 g
Ships in 21 days - from Aldrich Partner.
US$2,261.25