Ali Hayek

Ali Hayek
Saudi Aramco | Saudi Aramco · R&D

Organic Materials Science | Polymer Chemistry | Molecular Engineering

About

39
Publications
3,429
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
419
Citations
Introduction
Design and synthesis of new polymeric materials for the development of polymeric membranes for the removal of acid gases [hydrogen sulfide (H2S) and carbon dioxide (CO2)] from sour natural gas reserves under aggressive operational separation conditions. Check these useful links for more details: | http://www.alihayek.com | http://www.alihayek.com/recent-activities/ | http://www.alihayek.com/research/ |
Additional affiliations
January 2013 - present
Saudi Aramco
Position
  • Senior Researcher
Description
  • Check my YouTube Channel for videos on AP Chemistry and Organic Chemistry lessons. http://www.youtube.com/c/AliHayek
Education
July 2002 - October 2006
Louis Pasteur University
Field of study
  • Organic Materials Science

Publications

Publications (39)
Article
Three random and two block 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride (6FDA)‐based copolyimides with different 6FpDA:Durene molar ratio varying from 25 to 80% were prepared and characterized. The pure‐gas permeation data of their membranes were investigated at 100 psi and 22 °C. The CO2/CH4 ideal selectivity coefficient increased to around...
Article
A polyoxadiazole polymer POz-CF3 was prepared and complete gas permeation properties were investigated on its corresponding membrane using pure-, and multicomponent mixed-gas feeds. The POz-CF3 membrane demonstrated attractive pure- and sweet mixed-gas permeation properties; however, the performance of its membrane declined dramatically during sour...
Article
A new homopolymer, 6FDA-CARDO(t-Bu), was prepared from 6FDA-CARDO through one-step chemical modification by adding bulky tert-butyl groups, using Friedel–Crafts alkylation. The incorporation of the bulky groups led to a significant increase in the fractional free volume (FFV) within the matrix of membranes prepared from the modified polymer. The th...
Article
Natural gas purification is a challenging task due to the existing number of contaminants in the mixture. Sour natural gas, in particular, presents an even higher challenge due to the presence of the highly toxic hydrogen sulfide (H2S) gas. These contaminants level must be reduced to meet the sales gas specifications. In this paper, three DAM-based...
Article
Polymeric membranes prepared from glassy polymers suffer from a permeability-selectivity trade-off relationship. When their permeability is increased, their selectivity decreases, and vice versa. The performance of membranes during pure-gas permeation is assessed by plotting their permeability and selectivity data on a corresponding pure-gas upper...
Data
Supporting Information for: Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation.
Patent
Full-text available
Compositions of and methods for producing a modified polyimide-containing compound with an alkyl or acyl group, one method including selecting and preparing a polyimide-containing compound to undergo a Friedel-Crafts alkylation or acylation reaction; carrying out the Friedel-Crafts alkylation or acylation reaction on the polyimide-containing compou...
Data
Supporting Information for: Copolyimide Membranes with Improved H2S/CH4 Selectivity for High-Pressure Sour Mixed-Gas Separation
Patent
Full-text available
Co-polyimide membranes for separating components of sour natural gas including at least three distinct moieties polymerized together, the moieties including a 2,2’-bis(3,4 dicarboxyphenylhexafluoropropane dianhydride (6FDA) based moiety; 2,4,6-trimethyl-m–phenylenediamine (DAM) based moiety; and at least one component selected from the group consis...
Patent
Full-text available
Co-polyimide membranes for separating components of sour natural gas including at least three distinct moieties polymerized together, the moieties including a 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) based moiety; a 4,4′-(hexafluoroisopropylidene)dianiline (6FpDA) based moiety; and at least one component selected from the g...
Article
Full-text available
The consumption of natural gas (NG) is rapidly increasing worldwide as it is becoming the second largest fuel source after coal. However, many of the world gas reserves contain high levels of subquality NG including the presence of carbon dioxide (CO2), hydrogen sulfide (H2S), nitrogen (N2), benzene/toluene/xylene (BTX) etc., in varying amounts (up...
Data
This supporting information document contains data related to synthesis of monomers and polymers, solubility tests, FTIR analysis, and fractional free volume calculations.
Article
Three diamine triphenylamine-based monomers, 4,4’-diaminotriphenylamine (TPA), 4,4’-diamino-4”-(dimethylamino)triphenylamine (TPA(NMe2)), and 4,4’-diamino-4”-(tert-butyl)triphenylamine (TPA(t-Bu)) were reproduced in preparation for their 6FDA-based homopolyimides: 6FDA-TPA, 6FDA-TPA(NMe2) and 6FDA-TPA(t-Bu). The bulkiness effect of two pendent grou...
Article
Three aromatic 6FDA-Durene/MDEA random copolyimides with different Durene:MDEA molar ratios (3:1; 1:1 and 1:3) were synthesized, and pure gas permeation properties through their dense films were investigated. Compared to their corresponding homopolymers (6FDA-MDEA and 6FDA-Durene), the copolymers exhibit significant improvement in gas separation pe...
Article
Multi-block co-polyimides 6FDA-CARDO/6FDA-Durene with varying segmental lengths were synthesized and pure and mixed sour gas transport properties through dense membranes were investigated as function of feed pressure, temperature and gas composition. Pure gas measurement indicated that block co-polyimide 6FDA-CARDO/6FDA-Durene (2500/2500) membrane...
Patent
Full-text available
A molecule possessing a primary or secondary amino group and an additional functionality capable of providing a novel or improved property to a cellulose material has been permanently attached to the cellulose material in aqueous media using a water-soluble carbodiimide as the coupling agent/activator. One such molecule is 5-aminofluorescein (abbre...
Patent
Full-text available
Variable transmittance optical filters capable of transitioning from a light state to a dark state on exposure to UV radiation and from a dark state to a light state with application of an electric voltage are provided. The optical filters comprise a switching material that comprises one or more chromophores that have electrochromic and photochromi...
Patent
Full-text available
A method is conceived for producing hydrophobic lignocellulosics based on the graft copolymerisation of vinyl-type monomers onto the lignocellulosic backbone initiated by a redox couple initiator in aqueous medium. The green modification process can be carried out on any lignocellulosic material, for example, chemical, chemi-thermomechanical or the...
Patent
Full-text available
A compound according to Formula IA and IB, reversibly convertible under photochromic and electrochromic conditions between a ring-open isomer A and a ring-closed isomer B is provided. For substitutent groups, Z is N, O or S; each R1 is independently selected from the group consisting of H, or halo; each R2 is independently selected from the group c...
Article
Full-text available
In this research, a fibre modification technology has been developed based on the formation of an amide bond between the cellulose fibre carboxyl group and a primary or secondary amino group of functional amino molecules. Using this technology, a fluorescent molecule, 5-aminofluorescein, has been bonded to commercial, bleached Kraft pulp fibres in...
Article
Two groups of one-dimensional (1D) boron containing two-photon absorbing fluorophores have been prepared and characterized. One group includes boron atoms incorporated in the conjugated or pseudo conjugated central core and the other contain a boron cluster as an acceptor group at one end of the fluorophores. Two boron containing central cores (wit...
Article
Boron-containing two-photon-absorbing fluorophores have been prepared as new bifunctional molecules, potentially useful in two-photon excited microscopy (TPEM) and boron neutron capture therapy. They are based on a one-dimensional conjugated system containing a p-carborane entity at one end of the molecule and various electron-donating groups conta...
Patent
Full-text available
This invention relates generally to organic electroluminescent norbornene-silole monomer, poly(norbornene) homopolymer, and poly(norbornene) copolymer compounds, containing functionalized aryl and alkyl silole side chains having good host characteristics and solution processability, and to an electron transporting and/or hole blocking layers, and l...
Article
New boron containing two-photon absorbing fluorophores have been prepared. Centered on a pyrazabole central core, various conjugated systems and end groups were investigated to modulate their physicochemical properties (alkoxy, diphenylamino, and boron dipyromethene groups). One and two-photon photophysical characterizations were performed, showing...
Article
Here, a straightforward and general method for the rapid dendritic amplification of accessible surface functional groups on hydroxylated surfaces is described, with focus on its application to 3D biomineral surfaces. Reaction of hydroxyl-bearing silica surfaces with an aminosilane, followed by alternating exposure to a dipentaerythritol-derived pol...
Preprint
Full-text available
Poly(glycidyl methacrylate)s with different molecular weights have been synthesized in a well-controlled fashion using ATRP. 3D diamond-like cross-linked structures were successfully fabricated by multibeam interference lithography. The comparison of our experimental results with the calculated values showed that the 3D PGMA structures have a lower...
Article
Full-text available
Poly(glycidyl methacrylate) has been shown to be a useful material for fabrication of photonic crystal templates using multibeam interference lithography, since it exhibits lower shrinkage than conventional SU8. Three-dimensional (3D) laser microfabrication techniques such as two-photon lithography 1 and multibeam interference lithography 2 offer...
Article
Because of the spreading of nonlinear microscopies in biology, there is a strong demand for specifically engineered probes in these applications. Herein, we report on the imaging properties in living cells and nude mice brains of recently developed water soluble blue fluorophores that show efficient diffusion through cell membranes and blood-brain...
Article
We report herein the molecular engineering of an efficient two-photon absorbing (TPA) chromophore based on a donor-donor bis-stilbenyl entity to allow conjugation with biologically relevant molecules. The dye has been functionalized using an isothiocyanate moiety to conjugate it with the amine functions of poly(ethylenimine) (PEI), which is a catio...
Article
Full-text available
Two series of water-soluble blue fluorescent two-photon excited chromophores for bio-imaging based on bis-stilbenic structure were synthesized. Wadsworth-Emmons reaction was used to build one dimensional D-π-aromatic core-π-D structures. The water solubility is induced by three oligo-ethylene glycol moieties in positions 3, 4, and 5 of the peripher...
Article
Through-Bond-Kopplung über einen Cyclodiborazankern führt zu großen Absorptionsquerschnitten bei neuartigen zweiphotonenabsorbierenden Chromophoren (siehe Bild; B rosa, N blau, C grau; alle H-Atome außer BH (weiß) weggelassen). Dies ist ein erster Schritt zur Entwicklung von Chromophoren mit dualen Eigenschaften für Anwendungen in der Biologie oder...
Article
Full-text available
We report here the synthesis and characterization of a new type of non-ionic blue fluorescent water-soluble chromophores specifically designed for two-photon absorption microscopy. The water solubility is induced by introduction of short oligo(ethylene glycol) monomethyl ether moieties. This work has led to low molecular weight dyes with efficient...

Network

Cited By

Projects

Projects (7)
Archived project
Developing silole-based polymers for organic light-emitting diode devices.
Project
To develop polymeric membranes for sour mixed-gas separation application.