Desalination behavior analysis of interior-modified carbon nanotubes doped membrane by dielectric spectrum and molecular simulation

Li, Qing; Zhao, Kongshuang; Liu, Qingzhi; Wang, Jianhua

doi:10.1088/1361-6528/ab8988

Cited by 5 publications

(4 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The strongly anisotropic thermal expansion is expected to affect the contact between the crystals and the matrix, and could lead to enhanced transport properties of the membrane. Additional experiments were carried out to study the dielectric properties of pristine and doped membranes using electrochemical techniques which are widely used to characterize the polarized membrane behavior [73][74][75] . It was observed that the doped membrane has 25% higher dielectric constant (ε = 2.74 ± 0.04) compared to the pristine membrane (ε = 2.06 ± 0.06) (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Smart dynamic hybrid membranes with self-cleaning capability

Pantuso,

Ahmed,

Fontananova

et al. 2023

Nat Commun

View full text Add to dashboard Cite

The growing freshwater scarcity has caused increased use of membrane desalination of seawater as a relatively sustainable technology that promises to provide long-term solution for the increasingly water-stressed world. However, the currently used membranes for desalination on an industrial scale are inevitably prone to fouling that results in decreased flux and necessity for periodic chemical cleaning, and incur unacceptably high energy cost while also leaving an environmental footprint with unforeseeable long-term consequences. This extant problem requires an immediate shift to smart separation approaches with self-cleaning capability for enhanced efficiency and prolonged operational lifetime. Here, we describe a conceptually innovative approach to the design of smart membranes where a dynamic functionality is added to the surface layer of otherwise static membranes by incorporating stimuli-responsive organic crystals. We demonstrate a gating effect in the resulting smart dynamic membranes, whereby mechanical instability caused by rapid mechanical response of the crystals to heating slightly above room temperature activates the membrane and effectively removes the foulants, thereby increasing the mass transfer and extending its operational lifetime. The approach proposed here sets a platform for the development of a variety of energy-efficient hybrid membranes for water desalination and other separation processes that are devoid of fouling issues and circumvents the necessity of chemical cleaning operations.

show abstract

Section: Resultsmentioning

confidence: 99%

Smart dynamic hybrid membranes with self-cleaning capability

Pantuso,

Ahmed,

Fontananova

et al. 2023

Nat Commun

View full text Add to dashboard Cite

show abstract

“…In addition, perform molecular simulation of the PFEXs in Materials Studio to investigate the influence of different monomers on free volume from molecular dynamics. 26,27 A single polymer chain with 50 repeat units was constructed. After several geometric optimizations, its energy reached the minimum.…”

Section: Crystallinity Property Of Pfexsmentioning

confidence: 99%

Effect of di‐halogen monomers embraced in main chain of low‐dielectric colorless fluorene‐based poly(aryl ether)s on their performance

Zhu

Zong

Wang

et al. 2022

Polymers for Advanced Techs

View full text Add to dashboard Cite

Di-halogen monomer structures play crucial roles in determining the combined properties of high-performance poly(aryl ether)s for microelectronic applications. In order to disclose such relationship in detail, 9,9-bis(4-hydroxyphenyl) fluorene (BHF) was utilized to polymerize with various di-halogen monomers, bearing phenyl-1,-3,5-triazine, ketone, sulfone, nitrile, diketone moieties. Through solution nucleophilic substitution polymeri-zation, a series of linear poly(fluorenyl aryl ether) (PFEX) was prepared. FTIR, 1 H-NMR were resorted to confirm the polymer structure. PFEXs with high molecular weight exhibited a combination of excellent properties. Poly(fluorenyl aryl ether phenyl-s-triazine) (PFEP) and poly(fluorenyl aryl ether sulfone) (PFES) showed low dielectric constant of 2.59 and 2.43, respectively. Representatively, PFEP with T d5% value as high as 561 C and T g up to 302 C showed high light transmittance (86.94%), and tensile strength up to 91 MPa. Based on free volume calculation by molecular dynamics method, it was found that rigid and bulky structures, such as phenyl-1,3,5-triazine and sulfone groups, were proved to be beneficial for polymer thermal performance along with the dielectric property and light transparence. Robust polar group, for instance nitrile group, contributed more to thermal resistance, however, negatively affected the dielectric property. This work provide commendable suggestions for di-halogen monomer selection for future low-dielectric poly(aryl ether) developments.

show abstract

“…The more stacked PA matrix in the direction of the flow led to lower flux in PA-CNT1, while the high flux in PA-CNT2 was a result of the guiding effect as well as less severe stacking caused by the CNT. Li et al 203 reported, through a joint experimental and MD study, high water flux across a membrane made of functionalized MWNT-C 14 H 25 O 4 and PA. The finding was attributed to the larger pore dielectric parameters, larger average pore diameter, and higher water volume fraction of the MWNT-C 14 H 25 O 4 /PA membrane.…”

Section: Studies On Tfnc Membranesmentioning

confidence: 99%