Yanfang Fan

Yanfang Fan
China University of Petroleum, Beijing | CUPB · College of Chemical Engineering

Doctor of Philosophy

About

45
Publications
6,644
Reads
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1,274
Citations
Introduction
Yanfang Fan currently works at the School of Chemical & Environmental Engineering, China University of Petroleum (Beijing). Current research interests: novel gas separation membranes development, olefin/paraffin separation, adsorption -based gas separation. Their most recent publication is 'Tröger 's base Mixed Matrix Membranes for Gas Separation incorporating NH2-MIL-53(Al) Nanocrystals'.
Additional affiliations
May 2012 - present
Georgia Institute of Technology
Position
  • PostDoc Position
January 2011 - May 2012
University of Connecticut
Position
  • Research Assistant

Publications

Publications (45)
Article
To promote polyimide gas transport properties, we propose a facile technique through adjustable hydrogen bonding energy through blending polyimide (6FDA-DABA) containing –COOH groups and Tröger's base (TB) polymer without damaging polymer chemical structures. The hydrogen bonding strength between –OH groups in PI and the N atoms in TB (O–H⋯N) is we...
Article
Manipulating favorable interfacial microstructure is crucial to rationally design a high-performance mixed matrix membrane with defect-free interface. We describe herein an efficient pathway to finely tune the interfacial adhesion through balancing the metal organic frameworks and polymer functionality. The varied number of hydrogen bonds are estab...
Article
The combination of functionalized metal organic frameworks with a polymer with structural similarity is a feasible route to enhance binary phase adhesion of hybrid membranes. Herein, we incorporate amine-modified ZIF-8 with a new type of much permeable imidazole-containing copolyimide (6FBD), which contains the bulky 2,4,6-trimethyl-1,3-diaminobenz...
Article
Full-text available
High-performance membranes exceeding the conventional permeability-selectivity upper bound are attractive for advanced gas separations. In the context microporous polymers have gained increasing attention owing to their exceptional permeability, which, however, demonstrate a moderate selectivity unfavorable for separating similarly sized gas mixtur...
Article
The structural engineering and design of 6FDA/BPDA-based copolyimide membranes at a molecular level are developed to achieve advanced membrane materials with improved CO2 plasticization resistance as well as high gas separation performance. The commercially available diamine monomers with/without various electronegative groups (-CH3, –CF3 and -Cl)...
Article
Manufacturing defect-free mixed matrix membranes (MMMs) especially with high nanoparticle concentrations exceeding 40 wt% is still an ongoing challenge. Desired performance improvements are often unfulfilled in MMMs with high filler loading because nanoparticles with increasing contents are prone to aggregating, forming non-selective cavities, and...
Article
The CO2-induced plasticization effects impose detrimental effects on polymeric membranes separation performance. To address this issue, a high-performance crosslinked brominated 6FDA-based polyimide (BMPI) is developed in this work, exhibiting highly suppressed plasticizing effects. The permeability and selectivity of polyimide precursor membranes...
Article
Carbon molecular sieve (CMS) membranes were fabricated using carboxylated polyimides with various 6FpDA:DABA molar ratios. The as-prepared 6FDA-6FpDA:DABA multiblock polyimide, thermally crosslinked ones, and CMS membranes were characterized for CO2/CH4 and C2H4/C2H6 separation performance. Thermally crosslinked polyimide membranes due to decarboxy...
Article
Membrane-based separation technology holds great promise to effectively address separation needs in chemical industries due to advantages in energy efficiency, scalability, and small footprint. Mixed matrix membranes based on polymer/metal organic frameworks (MOFs), which combine the ease of processability of polymer materials with the excellent ad...
Article
Finely tailoring the interfacial interaction to minimize the defective structure in the hybrid membranes is a key to yield a mixed matrix membrane with enhanced gas separation performance. Here, a highly selective mixed matrix membrane based on imidazole containing polyimides and ZIF-8 fillers is reported. The ZIF-8 with imidazole linker offers a m...
Article
Full-text available
High amine efficiency amine‐modified silica adsorbents with fast adsorption rates have been developed by adding amine species including hydroxyl groups into polyethyleneimine (PEI)‐loaded mesoporous silica for CO2 capture. Two amine species of diethanolamine (DEA) and 3‐amino‐1,2‐propanediol (AP) including hydroxyl groups were introduced into PEI t...
Article
The rigid Tröger's base microporous polymers were utilized to fabricate mixed matrix membranes with NH2-MIL-53 (Al) nanocrystals. Such N containing polymers have the ability to interact with NH2-MIL-53 (Al), therefore yielding transparent, robust, and plasticization–resistant hybrid membranes. The resulting membranes show a remarkable increase in g...
Article
Abstract Comparative studies of the cyclic stability of primary, secondary, and tertiary amine-grafted silica/polymer composite fiber adsorbents upon exposure to simulated flue gas are reported. A simulated dry flue gas mixture with 200 ppm NO does not cause degradation of the amine grafted fiber adsorbents and all fibers retain their CO2 capacity...
Article
Uncertainty quantification plays a significant role in establishing reliability of the mathematical models, while applying to process optimization or technology feasibility studies. Uncertainties, in general, could occur either in the mathematical model or in the model parameters. In this work, process of CO2 adsorption on amine sorbents loaded in...
Article
The direct dual layer spinning of Torlon®/silica hollow fibers with a neat Torlon® lumen layer is reported here for the first time. The dual layer fibers containing a porous Torlon®/silica main structure and a dense, pure Torlon® polymer bore-side coating provide a simplified, scalable platform from which to construct hollow fiber amine sorbents fo...
Article
The dynamic CO2 sorption performance of polymer/silica supported polyethylenimine hollow fiber sorbents (CA-S-PEI), focusing on heat and mass transport effects, is investigated experimentally and computationally during sorption of CO2 from simulated, dry flue gases. The effect of the nonisothermality on the sorption performance is investigated by v...
Article
A mathematical model is developed for carbon dioxide adsorption on hollow fiber post infused with physically impregnated poly(ethylenimine) silica sorbent. The model includes detailed mass transfer mechanisms and is rigorously validated under different operating conditions of flue gas flow rate, number of fibers within the module, fiber length and...
Conference Paper
Rapid temperature swing adsorption/desorption (RTSA) using novel polymeric supported amine/silica hollow fiber sorbents represents a new approach to post combustion CO2 capture [1]. Hollow fiber sorbent contactors function as a “nanoscopic heat exchangers,” where flue gas is fed through the shell-side of fiber module and heating/cooling media is fe...
Conference Paper
For amine-based hollow fiber sorbents to be useful in practical CO2 capture applications, it is crucial to exhibit a stable performance and a long lifetime in the presence of flue gas impurities. In our earlier investigation,1 we studied the stability of supported amine sorbents to SOx and NOx gas impurities. Here, as a next step, the stability of...
Article
The dynamic adsorption behavior of CO2 under both non-isothermal and nearly isothermal conditions in silica supported poly(ethylenimine) (PEI) hollow fiber sorbents (Torlon®-S-PEI) is investigated in a rapid temperature swing adsorption (RTSA) process. A maximum CO2 breakthrough capacity of 1.33 mmol/g-fiber (2.66 mmol/g-silica) is observed when th...
Article
The morphology and physical properties of a pentablock copolymer (PBC) were investigated as a function of sulfonation or ion-exchange capacity (IEC). This material is comprised t-butylstyrene (tBS), hydrogenated isoprene (HI), sulfonated polystyrene (sPS), and polystyrene (PS). Thermally reversible crosslinks are created with tBS, which is disperse...
Conference Paper
Amine-loaded cellulose acetate (CA) polymer/silica hollow fiber sorbents for post-combustion CO2 recovery were fabricated by utilizing a post-spinning amine infusion technique. Building on prior work focusing on amine-loaded CA and poly(amide-imide) (PAI)/silica hollow fiber sorbents, direct dual layer spinning with PAI lumen layer PAI/silica/ poly...
Article
The physical and transport properties of Li+, Na+, K+, and Ca2+ neutralized Nafion were compared to its acid form. Nafion crystallinity was disrupted with a variety of cations while average d-spacing remained constant. Higher thermal stability in metal ion exchanged Nafion was observed using TGA. Ionic interactions were probed by DMA and spectrosco...
Article
Amine-loaded poly(amide-imide) (PAI)/silica hollow fiber sorbents are created and used in a rapid temperature swing adsorption (RTSA) system for CO2 capture under simulated postcombustion flue gas conditions. Poly(ethylenimine) (PEI) is infused into the PAI/mesoporous silica hollow fiber sorbents during fiber solvent exchange steps after fiber spin...
Conference Paper
Post-combustion CO2 capture using PAI polymer/silica/PEI hollow fiber sorbents Ying Labreche1, Yanfang Fang1, Fateme Rezaei1, Ryan P. Lively2, Christopher W. Jones1,*, William J. Koros1,* 1 Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332-0100, USA 2 Algenol Biofuels, 28100 Bonita Grande Drive, Bonita Springs, Florida 34...
Article
Amine/silica/polymer composite hollow fiber adsorbents are produced using a novel reactive post-spinning infusion technique and the obtained fibers are shown to capture CO2 from simulated flue gas. The post-spinning infusion technique allows for functionalization of polymer/silica hollow fibers with different types of amines during the solvent exch...
Article
The gas transport and physical properties of sulfonated poly(arylene ether sulfone) was studied as a function of sulfonated and unsulfonated block length (5k:5k, 10k:10k, and 15k:15k). Viscoelastic properties were evaluated using Dynamic Mechanical Analysis (DMA) to observe polymer relaxations and domain compatibility. A decrease in glass transitio...
Article
Full-text available
A series of poly(b-(t-butyl styrene)-b-(ethylene-co-propylene)-b-(styrene-co-styrene sulfonate)-b-(ethylene-co-propylene)-b-(t-butyl styrene)) ionomers were complexed with a series of metal ions. Raman sulfonate group symmetric ν s(SO3−) and asymmetric ν as(SO3−) stretching modes at 1031 and 1127 cm−1 were proportional to ion-exchange capacity. Mon...
Article
Molecule transport and physical properties in block ionomer membranes are dependent upon molecular weight, ion concentration as well as the ionic interactions within functional groups. The micro phase separation of block copolymers has the potential of attaining higher proton conductivity and desirable physical properties. A series of sulfonated po...
Article
A series of sulfonated poly(arylene ether sulfone) (BPSH-BPS) multiblock copolymer (MBC) ionomers were studied with respect to structure and physical properties. Ion exchange capacity (IECw) on a weight basis was constant for all MBC ionomers with controlled ionic and nonionic block lengths of 5k:5k, 10k:10k and 15k:15k. Viscoelastic properties wer...

Questions

Question (1)
Question
The PEI/silica sorbent weight decreased during heating at 100C for a long time. How to identify what is lost from the sorbent? Should it be PEI evaporation. But how to confirm this?

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