Novel "linear" trisiloxane surfactants with different terminal groups (CH 3 −, ClCH 2 −, CF 3 −) and two polyether hydrophilic groups were successfully synthesized and confirmed using 1 H NMR, 13 C NMR, 29 Si NMR, and FT-IR spectroscopy. The aggregation and adsorption behavior of the "linear" trisiloxane surfactants in aqueous solution was studied by surface tension, dynamic light scattering (DLS), transmission electron microscopy (FF-TEM), and TEM. Owing to the introduction of two polyether hydrophilic groups in the terminal positions of the trisiloxane hydrophobic part, "linear" trisiloxane surfactants (Me−Si 3 −EO 8 , Cl−Si 3 − EO 8 , and F−Si 3 −EO 8 ) tend to lie flat in the air/water interface and result in an increasing the surface tension at the CMC (γ CMC ) and single trisiloxane surfactant molecule at the air/water interface (A min ) values. Following the difference in the intermolecular forces and molecular volumes (CH 3 − < ClCH 2 − < CF 3 −), the γ CMC values decrease following the order Me− Si 3 −EO 8 > Cl−Si 3 −EO 8 > F−Si 3 −EO 8 , and the adsorption efficiency (pC 20 ), surface pressure at the CMC (π CMC ), CMC/C 20 , and A min values increase following the order Me−Si 3 −EO 8 < Cl−Si 3 −EO 8 < F−Si 3 −EO 8 . As comparison, fluorinated trisiloxane surfactant (F−Si 3 −EO 8 ) has greater surface activity attributed to the terminal CF 3 − group. The TEM and FF-TEM results illustrated that all the investigated "linear" trisiloxane surfactants can form nonuniform size spherical aggregates.

Review question / Objective: Investigate the relationship between Occupational Therapy and cognitive impairment in rehabilitation stroke patients by means of literature meta-analysis to analyze its effect on the improvement of cognitive function in patients. Condition being studied: Stroke Patients. METHODS Participant or population: All patients are stroke patients with stable condition who receive occupational therapy in hospital rehabilitation center or outside hospital after clinical treatment.

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