The manipulation of molecular motions
to construct highly ordered
supramolecular architectures from chaos in the solid state is considered
to be far more complex and challenging in comparison to that in solution.
In this work, a bottom-up molecular assembly approach based on a newly
designed skeleton-trimmed pillar[5]arene analogue, namely the permethylated
leggero pillar[5]arene MeP[5]L, is developed in the solid
state. An amorphous powder of MeP[5]L can take up certain
guest vapors to form various ordered linker-containing solid-state
molecular assemblies, which can be further used to construct a thermodynamically
favored linker-free superstructure upon heating. These approaches
are driven by vapor-induced solid-state molecular motions followed
by a thermally triggered phase-to-phase transformation. The intermolecular
interactions play a crucial role in controlling the molecular arrangements
in the resulting assemblies. This research will open new insights
into exploring controllable molecular motions and assemblies in the
solid state, providing new perspectives in supramolecular chemistry
and materials.
Synthetic
fungicides have been widely used to protect crops from
fungal diseases. However, excessive use of synthetic fungicides leads
to the generation of fungicide resistance in fungal pathogens. Recently,
smart cargo delivery systems have been introduced for the construction
of a pesticide delivery nanoplatform, benefiting from their controlled
release performance. Herein, a fungal pathogen microenvironment-responsive
supramolecular fungicide nanoplatform has been designed and constructed,
using quaternary ammonium salt (Q)-modified mesoporous silica nanoparticles
(MSN-Q NPs) as nanocarriers loaded with berberine hydrochloride (BH)
and carboxylatopillar[5]arene (CP[5]A) as nanogates to form BH-loaded
CP[5]A@MSN-Q NPs for effective inhibition of Botrytis
cinerea. CP[5]A as nanogates can endow the fungicide
nanoplatform with pH stimuli-responsive release features for the control
of fungicide release. The loaded BH, as a natural plant fungicide,
provides an ecofriendly alternative to synthetic fungicides for controlling B. cinerea. Interestingly, we use oxalic acid (OA)
secreted by B. cinerea as a trigger
so that BH can be released from the fungicide nanoplatform on demand
under pathogen microenvironments for controlling B.
cinerea. The experimental results indicate that the
fabricated fungicide nanoplatform could effectively inhibit the mycelial
growth and spore germination, providing a new way for the management
of B. cinerea in actual application.
Fluorescent N-doped carbon dots (CN-dots) covalently functionalized with carboxylatopillar[5]arene (CP[5]), namely CCDs, have been prepared the first time. Compared with CN-dots without pillarene units, the newly constructed fluorescent CCDs could recognize Fe3+ with high selectivity. Therefore, such CCDs can potentially serve as a promising chemical sensor for Fe3+ ions.
The study of aqueous-phase molecular recognition of artificial receptors is one of the frontiers in supramolecular chemistry since most biochemical processes and reactions take place in an aqueous medium and heavily rely on it. In this work, a water-soluble version of leggero pillar[5]arene bearing eight positively charged pyridinium moieties (CWP[5]L) was designed and synthesized, which exhibited good binding affinities with certain aliphatic sulfonate species in aqueous solutions. Significantly, control experiments demonstrate that the guest binding performance of CWP[5]L is superior to its counterpart water-soluble macrocyclic receptor in traditional pillararenes.
In this paper we use Majiagou geologic formation in Erdos Carbon Caputure and Storage(CCS) demonstration project aera as artificial geothermal reservoir, and create numerical models of Enhanced Geothermal System(EGS) using CO2 as a heat transfer carrier. In order to analyze the impacts of CO2 injection temperatures on heat extraction rate and the sustainability of CO2-EGS, five cases with different CO2 injection temperature are designed. Simulation results show that the range of the average heat extraction rate of case 1~5 is 6.56~8.47MW in the whole CO2-EGS operation period. The heat extraction rates vary over time, And it is 6.37~7.9MW in CO2 and water displacement stage and 6.64~8.68MW after aqueous phase dispear respectively. Injection temperature of CO2 significantly impacts the heat extraction rate of EGS .
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