Hydrogen-bonded Macrocluster Formation of Ethylene Glycol on Silica Surfaces in Ethylene Glycol-Cyclohexane Binary Liquids

2003 ◽  
Vol 32 (1) ◽  
pp. 84-85 ◽  
Author(s):  
Kazue Kurihara ◽  
Yasuhiro Nakagawa ◽  
Masashi Mizukami
Keyword(s):  
Ethylene Glycol ◽  
Binary Liquids ◽  
Silica Surfaces ◽  
Hydrogen Bonded

Surface Induced Hydrogen-Bonded Macrocluster Formation of Methanol on Silica Surfaces

Langmuir ◽  
2005 ◽  
Vol 21 (21) ◽  
pp. 9402-9405 ◽  
Author(s):  
Masashi Mizukami ◽  
Yasuhiro Nakagawa ◽  
Kazue Kurihara
Keyword(s):  
Silica Surfaces ◽  
Hydrogen Bonded

scholarly journals Clean chlorination of silica surfaces by a single-site substitution approach

2018 ◽  
Vol 47 (12) ◽  
pp. 4301-4306 ◽  
Author(s):  
Niladri Maity ◽  
Samir Barman ◽  
Edy Abou-Hamad ◽  
Valerio D'Elia ◽  
Jean-Marie Basset
Keyword(s):  
Silica Surface ◽  
Single Site ◽  
Silanol Groups ◽  
Silica Surfaces ◽  
Selective Chlorination ◽  
Hydrogen Bonded

Unveiling a clean, selective chlorination method for the quantitative substitution of well-defined non-hydrogen bonded silanol groups of the silica surface.

Conformational and dielectric relaxation studies on hydrogen bonded binary mixture of ethylene glycol ethyl ether and methanol

2020 ◽  
Author(s):  
Vikas Uddhavrao Magar ◽  
Prabhakar Bhagwatrao Undre ◽  
Ahmed Saleh Alameen ◽  
Salama Ahmed Yaseen ◽  
Faizaa Awad Saif ◽  
...  
Keyword(s):  
Binary Mixture ◽  
Ethylene Glycol ◽  
Dielectric Relaxation ◽  
Ethyl Ether ◽  
Relaxation Studies ◽  
Glycol Ethyl Ether ◽  
Hydrogen Bonded

The influence of ethylene glycol chains on the thermodynamics of hydrogen-bonded supramolecular assemblies in apolar solvents

2008 ◽  
pp. 4306 ◽  
Author(s):  
Tom F. A. de Greef ◽  
Marko M. L. Nieuwenhuizen ◽  
Patrick J. M. Stals ◽  
Carel F. C. Fitié ◽  
Anja R. A. Palmans ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Supramolecular Assemblies ◽  
Hydrogen Bonded

Hydrogen-Bonded Macrocluster Formation of 1-Propanol and 2-Propanol on Silica Surfaces

2003 ◽  
Vol 56 (10) ◽  
pp. 1071 ◽  
Author(s):  
Masashi Mizukami ◽  
Kazue Kurihara
Keyword(s):  
Hydrogen Bonding ◽  
Long Range ◽  
Hydroxyl Groups ◽  
Similar Amount ◽  
Colloidal Probe ◽  
Force Microscopy ◽  
Silica Surfaces ◽  
Atomic Force ◽  
Aggregation Structure ◽  
Hydrogen Bonded

We have investigated the adsorption of 1- and 2-propanol on silica surfaces from their mixtures with cyclohexane using a combination of colloidal probe atomic force microscopy, adsorption excess isotherms, and FTIR spectroscopy in the ATR mode. The adsorption isotherm indicated that a similar amount of each alcohol was adsorbed on the silica surfaces. FTIR spectra revealed that 1-propanol adsorbed on the surface employing hydrogen-bonding between the surface silanol groups and the hydroxyl groups of 1-propanol as well as between the hydroxyl groups of 1-propanol in the form of a linear zig-zag structure. This structure is similar to the linear hydrogen-bonded structure of ethanol, which we have found on silica and called a ‘surface molecular macrocluster’ (M. Mizukami, M. Moteki, K. Kurihara, J. Am. Chem. Soc. 2002, 124, 12 889). The contact of adsorbed layers of 1-propanol on the opposed silica surfaces brought about the long-range attraction extending to 69 ± 9 nm at 0.1 mol-% 1-propanol. 2-Propanol was also adsorbed on the surface by the hydrogen-bonding, however, in the form of a cyclic structure. No long-range attraction was observed in the 2-propanol/cyclohexane binary liquids at 0.1–6.0 mol-%. The absence of a long-range attraction can be explained by the cyclic aggregation structure of 2-propanol on the surface.

scholarly journals Hydrogen-Bonded Structure of Water in the Loop of Anchored Polyrotaxane Chain Controlled by Anchoring Density

2021 ◽  
Vol 9 ◽  
Author(s):  
Keishi Akada ◽  
Kosuke Yamazoe ◽  
Jun Miyawaki ◽  
Rina Maeda ◽  
Kohzo Ito ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Lone Pair ◽  
Confined Water ◽  
Poly Ethylene Glycol ◽  
Factors Affecting ◽  
Structure Of Water ◽  
Poly Ethylene ◽  
Coordinated Water ◽  
Relevant Factors ◽  
Hydrogen Bonded

Hydrogen-bonded network of water surrounding polymers is expected to be one of the most relevant factors affecting biocompatibility, while the specific hydrogen-bonded structure of water responsible for biocompatibility is still under debate. Here we study the hydrogen-bonded structure of water in a loop-shaped poly(ethylene glycol) chain in a polyrotaxane using synchrotron soft X-ray emission spectroscopy. By changing the density of anchoring molecules, hydrogen-bonded structure of water confined in the poly(ethylene glycol) loop was identified. The XES profile of the confined water indicates the absence of the low energy lone-pair peak, probably because the limited space of the polymer loop entropically inhibits the formation of tetrahedrally coordinated water. The volume of the confined water can be changed by the anchoring density, which implies the ability to control the biocompatibility of loop-shaped polymers.

Influence of hard segments content on thermal, morphological and mechanical properties of homo and co-polyurethanes: a comparative study

2021 ◽  
Vol 1 (109) ◽  
pp. 5-16
Author(s):  
Z.K. Alobad ◽  
M. Albozahid ◽  
H.Z. Naji ◽  
H.S. Alraheem ◽  
A. Saiani
Keyword(s):  
Mechanical Properties ◽  
Ethylene Glycol ◽  
Exothermic Peak ◽  
Thermoplastic Polyurethanes ◽  
Main Challenge ◽  
New Type ◽  
Hard Segments ◽  
Poly Ethylene ◽  
Poly Propylene ◽  
Hydrogen Bonded

Purpose: This work aims to study the effect of hard segments (HS) content on the thermal, morphological and mechanical properties of polyurethane polymers based on 1.5 pentanediol chain extenders. Design/methodology/approach: Two comparable series of polyurethanes were synthesised including homo-polyurethane (Homo-PU) and copolyurethane (Co-PU). The Homo-PU consists of 100% wt. of hard segments (HS). The Co-PU composes of 30%wt. of soft segments (SS) using a poly(ethylene glycol)-block-poly(propylene glycol)-blockpoly( ethylene glycol) material. The effect of hard segments content on the morphology of Homo-PU and Co-PU was also studied. Findings: The Homo-PU and Co-PU materials show three distinct degradation steps with the higher thermal stability of the Co-PU compared to the Homo-PU. Enthalpy of fusion (ΔHM) and heat capacity (ΔCP) of polyurethane (PU) samples decrease with decreasing HS content. In the cooling cycle, the higher exothermic peak of crystallization is observed in the Co-PU. In contrast, the cold crystalline peak is observed in the 2nd heating cycle of the Homo-PU. Melting temperature (TM) increases with increasing SS content. Glass transition temperature (Tg) of PU samples shifts to higher temperature with increasing HS content. Storage modulus (E’) of the Co-PU is higher than E’ of the Homo-PU. All N-H groups in PU samples are hydrogen-bonded, whilst most of the C=O groups are hydrogen-bonded. The degree of hydrogen bonding in PU samples decreases with decreasing HS content. The Homo-PU shows better hardness than the Co-PU and higher brittleness at low temperature. WAXS results of the Homo-PU display better crystallinity compared to the Co-PU. Research limitations/implications: The main challenge in this work was how to synthesis Thermoplastic polyurethanes (TPUs) with specific properties to compete other common polymer such as Polyamides (PA) and Polypropylene (PP).Practical implications: Thermoplastic polyurethanes (TPUs) can be used in various application such as backageing, foot,automobiles and constructions. Originality/value: A new type of TPUs that synthesized using different type of chain extender (1.5 pentanediol). Two different types of TPUs were synthesized one contained 30% SS and 70% HS and a second one contained 100% HS.

scholarly journals Specific Adsorption of Histidine-Tagged Proteins on Silica Surfaces Modified with Ni2+/NTA-Derivatized Poly(ethylene glycol)

Langmuir ◽  
2007 ◽  
Vol 23 (11) ◽  
pp. 6281-6288 ◽  
Author(s):  
Eunah Kang ◽  
Jin-Won Park ◽  
Scott J. McClellan ◽  
Jong-Mok Kim ◽  
David P. Holland ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Specific Adsorption ◽  
Poly Ethylene Glycol ◽  
Silica Surfaces ◽  
Poly Ethylene

Preparation of Nano-films by in situ Polymerization of Hydrogen-bonded Macroclusters ofN-isopropylacrylamide on Silica Surfaces

2005 ◽  
Vol 34 (2) ◽  
pp. 228-229
Author(s):  
Guolun Zhong ◽  
Masashi Mizukami ◽  
Isao Fukuchi ◽  
Takashi Miyahara ◽  
Kazue Kurihara
Keyword(s):  
In Situ Polymerization ◽  
Silica Surfaces ◽  
Hydrogen Bonded

Hydrogen-Bonded Macrocluster Formation of Ethanol on Silica Surfaces in Cyclohexane1

2002 ◽  
Vol 124 (43) ◽  
pp. 12889-12897 ◽  
Author(s):  
Masashi Mizukami ◽  
Masashi Moteki ◽  
Kazue Kurihara
Keyword(s):  
Silica Surfaces ◽  
Hydrogen Bonded
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